./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/eca-rers2012/Problem14_label56.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_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/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_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/config/TaipanReach.xml -i ../../sv-benchmarks/c/eca-rers2012/Problem14_label56.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/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_1914196a-f353-4974-afef-597ff3bc7fc7/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 36c6055d9bc91bdfe6bda40d6e8dfc8a04a1c5f2028c6061b128b455abf6cae5 --- Real Ultimate output --- This is Ultimate 0.2.2-dev-6a47aea [2021-11-23 17:10:33,387 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 17:10:33,390 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 17:10:33,456 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 17:10:33,456 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 17:10:33,462 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 17:10:33,464 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 17:10:33,470 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 17:10:33,473 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 17:10:33,483 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 17:10:33,484 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 17:10:33,487 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 17:10:33,487 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 17:10:33,490 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 17:10:33,493 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 17:10:33,500 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 17:10:33,502 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 17:10:33,503 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 17:10:33,506 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 17:10:33,516 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 17:10:33,518 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 17:10:33,520 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 17:10:33,524 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 17:10:33,526 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 17:10:33,537 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 17:10:33,538 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 17:10:33,538 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 17:10:33,540 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 17:10:33,541 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 17:10:33,543 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 17:10:33,544 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 17:10:33,545 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 17:10:33,547 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 17:10:33,549 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 17:10:33,551 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 17:10:33,551 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 17:10:33,552 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 17:10:33,552 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 17:10:33,553 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 17:10:33,554 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 17:10:33,555 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 17:10:33,556 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 17:10:33,609 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 17:10:33,610 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 17:10:33,611 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 17:10:33,611 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 17:10:33,619 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 17:10:33,619 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 17:10:33,619 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 17:10:33,620 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 17:10:33,620 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 17:10:33,620 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 17:10:33,621 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 17:10:33,622 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 17:10:33,622 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 17:10:33,622 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 17:10:33,623 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 17:10:33,623 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 17:10:33,623 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 17:10:33,624 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 17:10:33,624 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 17:10:33,625 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 17:10:33,625 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 17:10:33,625 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 17:10:33,626 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 17:10:33,626 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 17:10:33,626 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 17:10:33,626 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 17:10:33,628 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 17:10:33,629 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 17:10:33,629 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 17:10:33,629 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 17:10:33,630 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 17:10:33,630 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 17:10:33,630 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:10:33,631 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 17:10:33,631 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 17:10:33,631 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 17:10:33,631 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 17:10:33,632 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 17:10:33,632 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 17:10:33,632 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 17:10:33,633 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 17:10:33,633 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_1914196a-f353-4974-afef-597ff3bc7fc7/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 36c6055d9bc91bdfe6bda40d6e8dfc8a04a1c5f2028c6061b128b455abf6cae5 [2021-11-23 17:10:33,974 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 17:10:33,998 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 17:10:34,001 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 17:10:34,003 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 17:10:34,006 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 17:10:34,007 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/../../sv-benchmarks/c/eca-rers2012/Problem14_label56.c [2021-11-23 17:10:34,098 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/data/2ae6c554d/2169f1f21e7f4fc98b38931d9bf1d493/FLAG1a09abafa [2021-11-23 17:10:34,759 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 17:10:34,760 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/sv-benchmarks/c/eca-rers2012/Problem14_label56.c [2021-11-23 17:10:34,785 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/data/2ae6c554d/2169f1f21e7f4fc98b38931d9bf1d493/FLAG1a09abafa [2021-11-23 17:10:34,946 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/data/2ae6c554d/2169f1f21e7f4fc98b38931d9bf1d493 [2021-11-23 17:10:34,951 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 17:10:34,954 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 17:10:34,960 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 17:10:34,960 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 17:10:34,965 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 17:10:34,966 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:10:34" (1/1) ... [2021-11-23 17:10:34,968 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1fb52434 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:10:34, skipping insertion in model container [2021-11-23 17:10:34,968 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:10:34" (1/1) ... [2021-11-23 17:10:34,977 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 17:10:35,048 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 17:10:35,327 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_1914196a-f353-4974-afef-597ff3bc7fc7/sv-benchmarks/c/eca-rers2012/Problem14_label56.c[2009,2022] [2021-11-23 17:10:35,640 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:10:35,662 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 17:10:35,696 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_1914196a-f353-4974-afef-597ff3bc7fc7/sv-benchmarks/c/eca-rers2012/Problem14_label56.c[2009,2022] [2021-11-23 17:10:35,907 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:10:35,923 INFO L208 MainTranslator]: Completed translation [2021-11-23 17:10:35,924 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:10:35 WrapperNode [2021-11-23 17:10:35,924 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 17:10:35,926 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 17:10:35,926 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 17:10:35,926 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 17:10:35,934 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:10:35" (1/1) ... [2021-11-23 17:10:35,966 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:10:35" (1/1) ... [2021-11-23 17:10:36,059 INFO L137 Inliner]: procedures = 14, calls = 8, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 858 [2021-11-23 17:10:36,060 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 17:10:36,061 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 17:10:36,061 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 17:10:36,061 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 17:10:36,071 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:10:35" (1/1) ... [2021-11-23 17:10:36,071 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:10:35" (1/1) ... [2021-11-23 17:10:36,078 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:10:35" (1/1) ... [2021-11-23 17:10:36,093 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:10:35" (1/1) ... [2021-11-23 17:10:36,162 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:10:35" (1/1) ... [2021-11-23 17:10:36,179 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:10:35" (1/1) ... [2021-11-23 17:10:36,202 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:10:35" (1/1) ... [2021-11-23 17:10:36,213 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 17:10:36,214 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 17:10:36,214 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 17:10:36,215 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 17:10:36,216 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:10:35" (1/1) ... [2021-11-23 17:10:36,223 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:10:36,235 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:10:36,248 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 17:10:36,252 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 17:10:36,302 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 17:10:36,302 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 17:10:36,302 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 17:10:36,303 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 17:10:36,380 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 17:10:36,382 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 17:10:37,762 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 17:10:37,822 FATAL L? ?]: The Plugin de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder has thrown an exception: java.lang.UnsupportedOperationException: Set is immutable at de.uni_freiburg.informatik.ultimate.util.datastructures.ImmutableSet.addAll(ImmutableSet.java:313) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaBuilder.addBranchEncoders(TransFormulaBuilder.java:170) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaUtils.parallelComposition(TransFormulaUtils.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.ParallelComposition.(ParallelComposition.java:108) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CodeBlockFactory.constructParallelComposition(CodeBlockFactory.java:109) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CfgBuilder$LargeBlockEncoding.composeParallel(CfgBuilder.java:1792) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CfgBuilder$LargeBlockEncoding.(CfgBuilder.java:1653) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CfgBuilder.createIcfg(CfgBuilder.java:280) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.RCFGBuilderObserver.process(RCFGBuilderObserver.java:88) at de.uni_freiburg.informatik.ultimate.core.coreplugin.modelwalker.DFSTreeWalker.runObserver(DFSTreeWalker.java:65) at de.uni_freiburg.informatik.ultimate.core.coreplugin.modelwalker.BaseWalker.runObserver(BaseWalker.java:93) at de.uni_freiburg.informatik.ultimate.core.coreplugin.modelwalker.BaseWalker.run(BaseWalker.java:86) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 17:10:37,833 INFO L158 Benchmark]: Toolchain (without parser) took 2876.00ms. Allocated memory was 104.9MB in the beginning and 132.1MB in the end (delta: 27.3MB). Free memory was 69.3MB in the beginning and 77.5MB in the end (delta: -8.1MB). Peak memory consumption was 53.6MB. Max. memory is 16.1GB. [2021-11-23 17:10:37,833 INFO L158 Benchmark]: CDTParser took 0.32ms. Allocated memory is still 104.9MB. Free memory is still 58.5MB. There was no memory consumed. Max. memory is 16.1GB. [2021-11-23 17:10:37,835 INFO L158 Benchmark]: CACSL2BoogieTranslator took 965.24ms. Allocated memory is still 104.9MB. Free memory was 69.3MB in the beginning and 57.1MB in the end (delta: 12.2MB). Peak memory consumption was 12.6MB. Max. memory is 16.1GB. [2021-11-23 17:10:37,837 INFO L158 Benchmark]: Boogie Procedure Inliner took 134.30ms. Allocated memory is still 104.9MB. Free memory was 57.1MB in the beginning and 47.5MB in the end (delta: 9.6MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. [2021-11-23 17:10:37,838 INFO L158 Benchmark]: Boogie Preprocessor took 152.67ms. Allocated memory was 104.9MB in the beginning and 132.1MB in the end (delta: 27.3MB). Free memory was 47.5MB in the beginning and 101.4MB in the end (delta: -53.9MB). Peak memory consumption was 13.6MB. Max. memory is 16.1GB. [2021-11-23 17:10:37,839 INFO L158 Benchmark]: RCFGBuilder took 1615.40ms. Allocated memory is still 132.1MB. Free memory was 101.4MB in the beginning and 77.5MB in the end (delta: 24.0MB). Peak memory consumption was 58.8MB. Max. memory is 16.1GB. [2021-11-23 17:10:37,848 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.32ms. Allocated memory is still 104.9MB. Free memory is still 58.5MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 965.24ms. Allocated memory is still 104.9MB. Free memory was 69.3MB in the beginning and 57.1MB in the end (delta: 12.2MB). Peak memory consumption was 12.6MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 134.30ms. Allocated memory is still 104.9MB. Free memory was 57.1MB in the beginning and 47.5MB in the end (delta: 9.6MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. * Boogie Preprocessor took 152.67ms. Allocated memory was 104.9MB in the beginning and 132.1MB in the end (delta: 27.3MB). Free memory was 47.5MB in the beginning and 101.4MB in the end (delta: -53.9MB). Peak memory consumption was 13.6MB. Max. memory is 16.1GB. * RCFGBuilder took 1615.40ms. Allocated memory is still 132.1MB. Free memory was 101.4MB in the beginning and 77.5MB in the end (delta: 24.0MB). Peak memory consumption was 58.8MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: - ExceptionOrErrorResult: UnsupportedOperationException: Set is immutable de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: UnsupportedOperationException: Set is immutable: de.uni_freiburg.informatik.ultimate.util.datastructures.ImmutableSet.addAll(ImmutableSet.java:313) RESULT: Ultimate could not prove your program: Toolchain returned no result. [2021-11-23 17:10:37,877 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/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_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/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_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/config/TaipanReach.xml -i ../../sv-benchmarks/c/eca-rers2012/Problem14_label56.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/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_1914196a-f353-4974-afef-597ff3bc7fc7/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 36c6055d9bc91bdfe6bda40d6e8dfc8a04a1c5f2028c6061b128b455abf6cae5 --- Real Ultimate output --- This is Ultimate 0.2.2-dev-6a47aea [2021-11-23 17:10:40,624 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 17:10:40,626 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 17:10:40,688 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 17:10:40,689 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 17:10:40,694 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 17:10:40,696 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 17:10:40,701 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 17:10:40,705 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 17:10:40,710 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 17:10:40,712 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 17:10:40,713 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 17:10:40,713 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 17:10:40,715 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 17:10:40,716 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 17:10:40,718 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 17:10:40,719 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 17:10:40,720 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 17:10:40,723 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 17:10:40,725 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 17:10:40,727 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 17:10:40,731 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 17:10:40,732 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 17:10:40,735 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 17:10:40,739 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 17:10:40,744 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 17:10:40,744 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 17:10:40,746 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 17:10:40,746 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 17:10:40,748 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 17:10:40,748 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 17:10:40,749 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 17:10:40,750 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 17:10:40,751 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 17:10:40,753 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 17:10:40,753 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 17:10:40,754 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 17:10:40,754 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 17:10:40,754 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 17:10:40,755 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 17:10:40,756 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 17:10:40,757 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2021-11-23 17:10:40,784 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 17:10:40,785 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 17:10:40,785 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 17:10:40,785 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 17:10:40,786 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 17:10:40,787 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 17:10:40,787 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 17:10:40,788 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 17:10:40,788 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 17:10:40,788 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 17:10:40,789 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 17:10:40,789 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 17:10:40,790 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 17:10:40,790 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 17:10:40,790 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 17:10:40,791 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 17:10:40,791 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 17:10:40,791 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 17:10:40,791 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 17:10:40,792 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-23 17:10:40,792 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-23 17:10:40,792 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-23 17:10:40,792 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 17:10:40,793 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 17:10:40,793 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 17:10:40,793 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 17:10:40,793 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 17:10:40,794 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-23 17:10:40,794 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 17:10:40,794 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:10:40,794 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 17:10:40,795 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 17:10:40,795 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 17:10:40,795 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-23 17:10:40,795 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-23 17:10:40,796 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 17:10:40,796 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 17:10:40,796 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 17:10:40,796 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_1914196a-f353-4974-afef-597ff3bc7fc7/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 36c6055d9bc91bdfe6bda40d6e8dfc8a04a1c5f2028c6061b128b455abf6cae5 [2021-11-23 17:10:41,227 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 17:10:41,251 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 17:10:41,254 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 17:10:41,256 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 17:10:41,257 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 17:10:41,259 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/../../sv-benchmarks/c/eca-rers2012/Problem14_label56.c [2021-11-23 17:10:41,346 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/data/ea6d90889/68549b2f6a74464c84fc3fcaa022683d/FLAGfa16a30aa [2021-11-23 17:10:42,148 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 17:10:42,154 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/sv-benchmarks/c/eca-rers2012/Problem14_label56.c [2021-11-23 17:10:42,172 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/data/ea6d90889/68549b2f6a74464c84fc3fcaa022683d/FLAGfa16a30aa [2021-11-23 17:10:42,354 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/data/ea6d90889/68549b2f6a74464c84fc3fcaa022683d [2021-11-23 17:10:42,358 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 17:10:42,360 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 17:10:42,363 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 17:10:42,363 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 17:10:42,368 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 17:10:42,369 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:10:42" (1/1) ... [2021-11-23 17:10:42,370 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5dec4940 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:10:42, skipping insertion in model container [2021-11-23 17:10:42,370 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:10:42" (1/1) ... [2021-11-23 17:10:42,378 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 17:10:42,450 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 17:10:42,733 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_1914196a-f353-4974-afef-597ff3bc7fc7/sv-benchmarks/c/eca-rers2012/Problem14_label56.c[2009,2022] [2021-11-23 17:10:43,095 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:10:43,107 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 17:10:43,124 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_1914196a-f353-4974-afef-597ff3bc7fc7/sv-benchmarks/c/eca-rers2012/Problem14_label56.c[2009,2022] [2021-11-23 17:10:43,255 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:10:43,270 INFO L208 MainTranslator]: Completed translation [2021-11-23 17:10:43,270 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:10:43 WrapperNode [2021-11-23 17:10:43,271 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 17:10:43,272 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 17:10:43,272 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 17:10:43,272 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 17:10:43,280 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:10:43" (1/1) ... [2021-11-23 17:10:43,320 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:10:43" (1/1) ... [2021-11-23 17:10:43,404 INFO L137 Inliner]: procedures = 14, calls = 8, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 856 [2021-11-23 17:10:43,405 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 17:10:43,406 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 17:10:43,406 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 17:10:43,406 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 17:10:43,415 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:10:43" (1/1) ... [2021-11-23 17:10:43,416 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:10:43" (1/1) ... [2021-11-23 17:10:43,421 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:10:43" (1/1) ... [2021-11-23 17:10:43,422 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:10:43" (1/1) ... [2021-11-23 17:10:43,460 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:10:43" (1/1) ... [2021-11-23 17:10:43,479 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:10:43" (1/1) ... [2021-11-23 17:10:43,484 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:10:43" (1/1) ... [2021-11-23 17:10:43,512 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 17:10:43,513 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 17:10:43,513 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 17:10:43,513 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 17:10:43,514 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:10:43" (1/1) ... [2021-11-23 17:10:43,526 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:10:43,538 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:10:43,556 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 17:10:43,573 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 17:10:43,620 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 17:10:43,620 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-23 17:10:43,620 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 17:10:43,620 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 17:10:43,740 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 17:10:43,741 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 17:10:47,544 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 17:10:47,557 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 17:10:47,558 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-23 17:10:47,561 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 05:10:47 BoogieIcfgContainer [2021-11-23 17:10:47,561 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 17:10:47,563 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 17:10:47,563 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 17:10:47,567 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 17:10:47,568 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 05:10:42" (1/3) ... [2021-11-23 17:10:47,569 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5283e17b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 05:10:47, skipping insertion in model container [2021-11-23 17:10:47,569 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:10:43" (2/3) ... [2021-11-23 17:10:47,569 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5283e17b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 05:10:47, skipping insertion in model container [2021-11-23 17:10:47,569 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 05:10:47" (3/3) ... [2021-11-23 17:10:47,571 INFO L111 eAbstractionObserver]: Analyzing ICFG Problem14_label56.c [2021-11-23 17:10:47,578 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 17:10:47,578 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 17:10:47,650 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 17:10:47,662 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-23 17:10:47,662 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 17:10:47,688 INFO L276 IsEmpty]: Start isEmpty. Operand has 245 states, 243 states have (on average 1.7366255144032923) internal successors, (422), 244 states have internal predecessors, (422), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:10:47,707 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-23 17:10:47,708 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:10:47,709 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:10:47,709 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:10:47,716 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:10:47,716 INFO L85 PathProgramCache]: Analyzing trace with hash 156847385, now seen corresponding path program 1 times [2021-11-23 17:10:47,733 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:10:47,733 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1932172946] [2021-11-23 17:10:47,734 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:10:47,735 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:10:47,735 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:10:47,741 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:10:47,748 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-23 17:10:47,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:10:47,862 INFO L263 TraceCheckSpWp]: Trace formula consists of 45 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:10:47,867 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:10:48,002 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:10:48,003 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:10:48,004 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:10:48,004 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1932172946] [2021-11-23 17:10:48,005 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1932172946] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:10:48,005 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:10:48,006 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 17:10:48,008 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1013840928] [2021-11-23 17:10:48,010 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:10:48,015 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:10:48,016 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:10:48,055 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:10:48,056 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:10:48,062 INFO L87 Difference]: Start difference. First operand has 245 states, 243 states have (on average 1.7366255144032923) internal successors, (422), 244 states have internal predecessors, (422), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 5.666666666666667) internal successors, (17), 2 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:10:52,081 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:10:52,081 INFO L93 Difference]: Finished difference Result 669 states and 1200 transitions. [2021-11-23 17:10:52,085 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:10:52,087 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 5.666666666666667) internal successors, (17), 2 states have internal predecessors, (17), 0 states have call successors, (0), 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 17:10:52,087 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:10:52,103 INFO L225 Difference]: With dead ends: 669 [2021-11-23 17:10:52,103 INFO L226 Difference]: Without dead ends: 360 [2021-11-23 17:10:52,108 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:10:52,112 INFO L933 BasicCegarLoop]: 124 mSDtfsCounter, 178 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 575 mSolverCounterSat, 125 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 178 SdHoareTripleChecker+Valid, 131 SdHoareTripleChecker+Invalid, 700 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 125 IncrementalHoareTripleChecker+Valid, 575 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.9s IncrementalHoareTripleChecker+Time [2021-11-23 17:10:52,113 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [178 Valid, 131 Invalid, 700 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [125 Valid, 575 Invalid, 0 Unknown, 0 Unchecked, 3.9s Time] [2021-11-23 17:10:52,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 360 states. [2021-11-23 17:10:52,176 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 360 to 360. [2021-11-23 17:10:52,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 360 states, 359 states have (on average 1.4874651810584958) internal successors, (534), 359 states have internal predecessors, (534), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:10:52,181 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 360 states to 360 states and 534 transitions. [2021-11-23 17:10:52,183 INFO L78 Accepts]: Start accepts. Automaton has 360 states and 534 transitions. Word has length 17 [2021-11-23 17:10:52,183 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:10:52,184 INFO L470 AbstractCegarLoop]: Abstraction has 360 states and 534 transitions. [2021-11-23 17:10:52,184 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 5.666666666666667) internal successors, (17), 2 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:10:52,184 INFO L276 IsEmpty]: Start isEmpty. Operand 360 states and 534 transitions. [2021-11-23 17:10:52,188 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-11-23 17:10:52,188 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:10:52,189 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:10:52,204 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (2)] Ended with exit code 0 [2021-11-23 17:10:52,400 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:10:52,401 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:10:52,402 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:10:52,402 INFO L85 PathProgramCache]: Analyzing trace with hash -488170044, now seen corresponding path program 1 times [2021-11-23 17:10:52,404 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:10:52,409 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1977132743] [2021-11-23 17:10:52,410 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:10:52,410 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:10:52,410 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:10:52,411 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:10:52,413 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-23 17:10:52,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:10:52,504 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:10:52,507 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:10:52,875 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:10:52,875 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:10:52,875 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:10:52,876 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1977132743] [2021-11-23 17:10:52,876 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1977132743] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:10:52,876 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:10:52,876 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 17:10:52,876 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1503787782] [2021-11-23 17:10:52,877 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:10:52,878 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:10:52,879 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:10:52,879 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:10:52,879 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:10:52,880 INFO L87 Difference]: Start difference. First operand 360 states and 534 transitions. Second operand has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 2 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 17:10:57,194 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:10:57,194 INFO L93 Difference]: Finished difference Result 1074 states and 1597 transitions. [2021-11-23 17:10:57,195 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:10:57,195 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 2 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 82 [2021-11-23 17:10:57,196 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:10:57,203 INFO L225 Difference]: With dead ends: 1074 [2021-11-23 17:10:57,203 INFO L226 Difference]: Without dead ends: 716 [2021-11-23 17:10:57,206 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 80 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:10:57,208 INFO L933 BasicCegarLoop]: 98 mSDtfsCounter, 115 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 532 mSolverCounterSat, 71 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 115 SdHoareTripleChecker+Valid, 102 SdHoareTripleChecker+Invalid, 603 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 71 IncrementalHoareTripleChecker+Valid, 532 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.3s IncrementalHoareTripleChecker+Time [2021-11-23 17:10:57,209 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [115 Valid, 102 Invalid, 603 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [71 Valid, 532 Invalid, 0 Unknown, 0 Unchecked, 4.3s Time] [2021-11-23 17:10:57,212 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 716 states. [2021-11-23 17:10:57,276 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 716 to 716. [2021-11-23 17:10:57,278 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 716 states, 715 states have (on average 1.3454545454545455) internal successors, (962), 715 states have internal predecessors, (962), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:10:57,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 716 states to 716 states and 962 transitions. [2021-11-23 17:10:57,283 INFO L78 Accepts]: Start accepts. Automaton has 716 states and 962 transitions. Word has length 82 [2021-11-23 17:10:57,284 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:10:57,284 INFO L470 AbstractCegarLoop]: Abstraction has 716 states and 962 transitions. [2021-11-23 17:10:57,284 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 2 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 17:10:57,285 INFO L276 IsEmpty]: Start isEmpty. Operand 716 states and 962 transitions. [2021-11-23 17:10:57,288 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-11-23 17:10:57,288 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:10:57,289 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:10:57,303 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (3)] Ended with exit code 0 [2021-11-23 17:10:57,497 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:10:57,497 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:10:57,498 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:10:57,498 INFO L85 PathProgramCache]: Analyzing trace with hash -2063684370, now seen corresponding path program 1 times [2021-11-23 17:10:57,499 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:10:57,500 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1878897366] [2021-11-23 17:10:57,500 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:10:57,501 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:10:57,501 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:10:57,502 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:10:57,505 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-23 17:10:57,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:10:57,559 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:10:57,563 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:10:57,914 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:10:57,914 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:10:57,915 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:10:57,915 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1878897366] [2021-11-23 17:10:57,915 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1878897366] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:10:57,916 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:10:57,916 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 17:10:57,921 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1205945724] [2021-11-23 17:10:57,921 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:10:57,922 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:10:57,922 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:10:57,923 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:10:57,924 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:10:57,925 INFO L87 Difference]: Start difference. First operand 716 states and 962 transitions. Second operand has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 2 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:11:01,559 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:11:01,559 INFO L93 Difference]: Finished difference Result 1964 states and 2655 transitions. [2021-11-23 17:11:01,568 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:11:01,569 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 2 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 85 [2021-11-23 17:11:01,570 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:11:01,578 INFO L225 Difference]: With dead ends: 1964 [2021-11-23 17:11:01,578 INFO L226 Difference]: Without dead ends: 1250 [2021-11-23 17:11:01,580 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 83 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:11:01,584 INFO L933 BasicCegarLoop]: 85 mSDtfsCounter, 129 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 501 mSolverCounterSat, 78 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 129 SdHoareTripleChecker+Valid, 89 SdHoareTripleChecker+Invalid, 579 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 78 IncrementalHoareTripleChecker+Valid, 501 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.6s IncrementalHoareTripleChecker+Time [2021-11-23 17:11:01,587 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [129 Valid, 89 Invalid, 579 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [78 Valid, 501 Invalid, 0 Unknown, 0 Unchecked, 3.6s Time] [2021-11-23 17:11:01,591 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1250 states. [2021-11-23 17:11:01,627 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1250 to 1250. [2021-11-23 17:11:01,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1250 states, 1249 states have (on average 1.245796637309848) internal successors, (1556), 1249 states have internal predecessors, (1556), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:11:01,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1250 states to 1250 states and 1556 transitions. [2021-11-23 17:11:01,637 INFO L78 Accepts]: Start accepts. Automaton has 1250 states and 1556 transitions. Word has length 85 [2021-11-23 17:11:01,640 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:11:01,641 INFO L470 AbstractCegarLoop]: Abstraction has 1250 states and 1556 transitions. [2021-11-23 17:11:01,641 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 2 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:11:01,641 INFO L276 IsEmpty]: Start isEmpty. Operand 1250 states and 1556 transitions. [2021-11-23 17:11:01,656 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 167 [2021-11-23 17:11:01,658 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:11:01,659 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:11:01,675 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-23 17:11:01,872 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:11:01,872 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:11:01,873 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:11:01,873 INFO L85 PathProgramCache]: Analyzing trace with hash 597716731, now seen corresponding path program 1 times [2021-11-23 17:11:01,875 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:11:01,878 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1608454255] [2021-11-23 17:11:01,878 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:11:01,879 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:11:01,879 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:11:01,880 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:11:01,910 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-11-23 17:11:02,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:11:02,049 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:11:02,055 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:11:03,056 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 28 proven. 69 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:11:03,057 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:11:03,999 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 28 proven. 69 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:11:03,999 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:11:04,000 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1608454255] [2021-11-23 17:11:04,000 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1608454255] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:11:04,000 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [833898790] [2021-11-23 17:11:04,000 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:11:04,001 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:11:04,001 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:11:04,006 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:11:04,014 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (6)] Waiting until timeout for monitored process [2021-11-23 17:11:04,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:11:04,168 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:11:04,174 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:11:04,874 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 82 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:11:04,874 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:11:05,556 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 82 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:11:05,556 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [833898790] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:11:05,556 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [924468574] [2021-11-23 17:11:05,557 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:11:05,557 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:11:05,557 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:11:05,560 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:11:05,561 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-23 17:11:05,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:11:05,690 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:11:05,694 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:11:06,645 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 97 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:11:06,645 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:11:06,645 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [924468574] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:11:06,645 INFO L186 FreeRefinementEngine]: Found 1 perfect and 4 imperfect interpolant sequences. [2021-11-23 17:11:06,646 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4, 4, 4, 4] total 9 [2021-11-23 17:11:06,646 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1286167188] [2021-11-23 17:11:06,646 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:11:06,647 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 17:11:06,647 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:11:06,648 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 17:11:06,648 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-11-23 17:11:06,648 INFO L87 Difference]: Start difference. First operand 1250 states and 1556 transitions. Second operand has 4 states, 4 states have (on average 41.5) internal successors, (166), 3 states have internal predecessors, (166), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:11:13,282 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:11:13,282 INFO L93 Difference]: Finished difference Result 2378 states and 3064 transitions. [2021-11-23 17:11:13,283 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 17:11:13,283 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 41.5) internal successors, (166), 3 states have internal predecessors, (166), 0 states have call successors, (0), 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 166 [2021-11-23 17:11:13,284 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:11:13,291 INFO L225 Difference]: With dead ends: 2378 [2021-11-23 17:11:13,291 INFO L226 Difference]: Without dead ends: 1250 [2021-11-23 17:11:13,293 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 825 GetRequests, 818 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-11-23 17:11:13,294 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 211 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 725 mSolverCounterSat, 231 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 211 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 956 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 231 IncrementalHoareTripleChecker+Valid, 725 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.6s IncrementalHoareTripleChecker+Time [2021-11-23 17:11:13,295 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [211 Valid, 16 Invalid, 956 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [231 Valid, 725 Invalid, 0 Unknown, 0 Unchecked, 6.6s Time] [2021-11-23 17:11:13,297 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1250 states. [2021-11-23 17:11:13,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1250 to 1072. [2021-11-23 17:11:13,325 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1072 states, 1071 states have (on average 1.0999066293183941) internal successors, (1178), 1071 states have internal predecessors, (1178), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:11:13,330 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1072 states to 1072 states and 1178 transitions. [2021-11-23 17:11:13,330 INFO L78 Accepts]: Start accepts. Automaton has 1072 states and 1178 transitions. Word has length 166 [2021-11-23 17:11:13,331 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:11:13,331 INFO L470 AbstractCegarLoop]: Abstraction has 1072 states and 1178 transitions. [2021-11-23 17:11:13,331 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 41.5) internal successors, (166), 3 states have internal predecessors, (166), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:11:13,332 INFO L276 IsEmpty]: Start isEmpty. Operand 1072 states and 1178 transitions. [2021-11-23 17:11:13,334 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 193 [2021-11-23 17:11:13,335 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:11:13,335 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:11:13,381 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-23 17:11:13,551 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-11-23 17:11:13,745 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (6)] Forceful destruction successful, exit code 0 [2021-11-23 17:11:13,944 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:11:13,944 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:11:13,944 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:11:13,945 INFO L85 PathProgramCache]: Analyzing trace with hash 608974170, now seen corresponding path program 1 times [2021-11-23 17:11:13,947 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:11:13,947 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1078664291] [2021-11-23 17:11:13,947 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:11:13,947 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:11:13,948 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:11:13,951 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:11:13,973 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-11-23 17:11:14,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:11:14,083 INFO L263 TraceCheckSpWp]: Trace formula consists of 236 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:11:14,085 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:11:15,449 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 29 proven. 0 refuted. 0 times theorem prover too weak. 68 trivial. 0 not checked. [2021-11-23 17:11:15,449 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:11:15,449 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:11:15,449 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1078664291] [2021-11-23 17:11:15,450 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1078664291] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:11:15,450 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:11:15,450 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 17:11:15,450 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [660813318] [2021-11-23 17:11:15,450 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:11:15,451 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:11:15,451 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:11:15,451 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:11:15,452 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:11:15,452 INFO L87 Difference]: Start difference. First operand 1072 states and 1178 transitions. Second operand has 3 states, 3 states have (on average 41.666666666666664) internal successors, (125), 2 states have internal predecessors, (125), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:11:17,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:11:17,348 INFO L93 Difference]: Finished difference Result 1786 states and 1991 transitions. [2021-11-23 17:11:17,349 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:11:17,349 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 41.666666666666664) internal successors, (125), 2 states have internal predecessors, (125), 0 states have call successors, (0), 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 192 [2021-11-23 17:11:17,350 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:11:17,358 INFO L225 Difference]: With dead ends: 1786 [2021-11-23 17:11:17,358 INFO L226 Difference]: Without dead ends: 1072 [2021-11-23 17:11:17,359 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 191 GetRequests, 190 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:11:17,361 INFO L933 BasicCegarLoop]: 63 mSDtfsCounter, 73 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 411 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 67 SdHoareTripleChecker+Invalid, 414 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 411 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2021-11-23 17:11:17,361 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [73 Valid, 67 Invalid, 414 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 411 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2021-11-23 17:11:17,364 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1072 states. [2021-11-23 17:11:17,385 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1072 to 1072. [2021-11-23 17:11:17,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1072 states, 1071 states have (on average 1.096171802054155) internal successors, (1174), 1071 states have internal predecessors, (1174), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:11:17,392 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1072 states to 1072 states and 1174 transitions. [2021-11-23 17:11:17,392 INFO L78 Accepts]: Start accepts. Automaton has 1072 states and 1174 transitions. Word has length 192 [2021-11-23 17:11:17,393 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:11:17,393 INFO L470 AbstractCegarLoop]: Abstraction has 1072 states and 1174 transitions. [2021-11-23 17:11:17,393 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 41.666666666666664) internal successors, (125), 2 states have internal predecessors, (125), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:11:17,394 INFO L276 IsEmpty]: Start isEmpty. Operand 1072 states and 1174 transitions. [2021-11-23 17:11:17,402 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 404 [2021-11-23 17:11:17,403 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:11:17,403 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1] [2021-11-23 17:11:17,421 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-11-23 17:11:17,617 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:11:17,617 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:11:17,618 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:11:17,618 INFO L85 PathProgramCache]: Analyzing trace with hash -173297121, now seen corresponding path program 1 times [2021-11-23 17:11:17,619 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:11:17,620 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [915098298] [2021-11-23 17:11:17,620 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:11:17,620 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:11:17,620 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:11:17,622 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:11:17,623 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-11-23 17:11:17,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:11:17,867 INFO L263 TraceCheckSpWp]: Trace formula consists of 464 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:11:17,871 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:11:19,157 INFO L134 CoverageAnalysis]: Checked inductivity of 579 backedges. 250 proven. 210 refuted. 0 times theorem prover too weak. 119 trivial. 0 not checked. [2021-11-23 17:11:19,157 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:11:20,881 INFO L134 CoverageAnalysis]: Checked inductivity of 579 backedges. 460 proven. 0 refuted. 0 times theorem prover too weak. 119 trivial. 0 not checked. [2021-11-23 17:11:20,881 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:11:20,882 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [915098298] [2021-11-23 17:11:20,882 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [915098298] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-23 17:11:20,882 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 17:11:20,882 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3] total 5 [2021-11-23 17:11:20,883 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [974027265] [2021-11-23 17:11:20,883 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:11:20,884 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:11:20,884 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:11:20,884 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:11:20,885 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:11:20,885 INFO L87 Difference]: Start difference. First operand 1072 states and 1174 transitions. Second operand has 3 states, 3 states have (on average 95.33333333333333) internal successors, (286), 3 states have internal predecessors, (286), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:11:27,158 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:11:27,159 INFO L93 Difference]: Finished difference Result 2320 states and 2617 transitions. [2021-11-23 17:11:27,159 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:11:27,159 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 95.33333333333333) internal successors, (286), 3 states have internal predecessors, (286), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 403 [2021-11-23 17:11:27,160 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:11:27,169 INFO L225 Difference]: With dead ends: 2320 [2021-11-23 17:11:27,170 INFO L226 Difference]: Without dead ends: 1606 [2021-11-23 17:11:27,171 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 804 GetRequests, 801 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:11:27,172 INFO L933 BasicCegarLoop]: 226 mSDtfsCounter, 76 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 434 mSolverCounterSat, 47 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 76 SdHoareTripleChecker+Valid, 230 SdHoareTripleChecker+Invalid, 481 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 434 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:11:27,173 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [76 Valid, 230 Invalid, 481 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [47 Valid, 434 Invalid, 0 Unknown, 0 Unchecked, 6.2s Time] [2021-11-23 17:11:27,176 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1606 states. [2021-11-23 17:11:27,224 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1606 to 1606. [2021-11-23 17:11:27,227 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1606 states, 1605 states have (on average 1.1190031152647975) internal successors, (1796), 1605 states have internal predecessors, (1796), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:11:27,232 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1606 states to 1606 states and 1796 transitions. [2021-11-23 17:11:27,232 INFO L78 Accepts]: Start accepts. Automaton has 1606 states and 1796 transitions. Word has length 403 [2021-11-23 17:11:27,233 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:11:27,234 INFO L470 AbstractCegarLoop]: Abstraction has 1606 states and 1796 transitions. [2021-11-23 17:11:27,234 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 95.33333333333333) internal successors, (286), 3 states have internal predecessors, (286), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:11:27,234 INFO L276 IsEmpty]: Start isEmpty. Operand 1606 states and 1796 transitions. [2021-11-23 17:11:27,244 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 411 [2021-11-23 17:11:27,244 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:11:27,245 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:11:27,274 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2021-11-23 17:11:27,457 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:11:27,458 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:11:27,458 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:11:27,459 INFO L85 PathProgramCache]: Analyzing trace with hash 652050534, now seen corresponding path program 1 times [2021-11-23 17:11:27,460 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:11:27,461 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1549569591] [2021-11-23 17:11:27,461 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:11:27,461 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:11:27,461 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:11:27,462 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:11:27,465 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-11-23 17:11:27,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:11:27,689 INFO L263 TraceCheckSpWp]: Trace formula consists of 472 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:11:27,696 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:11:29,792 INFO L134 CoverageAnalysis]: Checked inductivity of 579 backedges. 59 proven. 347 refuted. 0 times theorem prover too weak. 173 trivial. 0 not checked. [2021-11-23 17:11:29,793 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:11:33,682 INFO L134 CoverageAnalysis]: Checked inductivity of 579 backedges. 406 proven. 0 refuted. 0 times theorem prover too weak. 173 trivial. 0 not checked. [2021-11-23 17:11:33,682 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:11:33,682 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1549569591] [2021-11-23 17:11:33,683 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1549569591] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-23 17:11:33,683 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 17:11:33,683 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3] total 5 [2021-11-23 17:11:33,684 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [695792702] [2021-11-23 17:11:33,684 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:11:33,685 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:11:33,685 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:11:33,685 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:11:33,686 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:11:33,686 INFO L87 Difference]: Start difference. First operand 1606 states and 1796 transitions. Second operand has 3 states, 3 states have (on average 79.66666666666667) internal successors, (239), 3 states have internal predecessors, (239), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:11:38,407 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:11:38,408 INFO L93 Difference]: Finished difference Result 3210 states and 3663 transitions. [2021-11-23 17:11:38,408 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:11:38,408 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 79.66666666666667) internal successors, (239), 3 states have internal predecessors, (239), 0 states have call successors, (0), 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 410 [2021-11-23 17:11:38,409 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:11:38,421 INFO L225 Difference]: With dead ends: 3210 [2021-11-23 17:11:38,421 INFO L226 Difference]: Without dead ends: 1962 [2021-11-23 17:11:38,424 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 818 GetRequests, 815 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:11:38,425 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 77 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 404 mSolverCounterSat, 97 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 77 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 501 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 97 IncrementalHoareTripleChecker+Valid, 404 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.7s IncrementalHoareTripleChecker+Time [2021-11-23 17:11:38,425 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [77 Valid, 20 Invalid, 501 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [97 Valid, 404 Invalid, 0 Unknown, 0 Unchecked, 4.7s Time] [2021-11-23 17:11:38,429 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1962 states. [2021-11-23 17:11:38,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1962 to 1962. [2021-11-23 17:11:38,479 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1962 states, 1961 states have (on average 1.1147373788883224) internal successors, (2186), 1961 states have internal predecessors, (2186), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:11:38,486 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1962 states to 1962 states and 2186 transitions. [2021-11-23 17:11:38,486 INFO L78 Accepts]: Start accepts. Automaton has 1962 states and 2186 transitions. Word has length 410 [2021-11-23 17:11:38,487 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:11:38,487 INFO L470 AbstractCegarLoop]: Abstraction has 1962 states and 2186 transitions. [2021-11-23 17:11:38,488 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 79.66666666666667) internal successors, (239), 3 states have internal predecessors, (239), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:11:38,488 INFO L276 IsEmpty]: Start isEmpty. Operand 1962 states and 2186 transitions. [2021-11-23 17:11:38,492 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 456 [2021-11-23 17:11:38,493 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:11:38,493 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:11:38,513 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (10)] Ended with exit code 0 [2021-11-23 17:11:38,710 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:11:38,710 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:11:38,711 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:11:38,711 INFO L85 PathProgramCache]: Analyzing trace with hash -1687438755, now seen corresponding path program 1 times [2021-11-23 17:11:38,713 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:11:38,714 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1889356377] [2021-11-23 17:11:38,714 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:11:38,714 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:11:38,714 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:11:38,715 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:11:38,745 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2021-11-23 17:11:39,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:11:39,029 INFO L263 TraceCheckSpWp]: Trace formula consists of 516 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 17:11:39,037 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:11:48,348 INFO L134 CoverageAnalysis]: Checked inductivity of 579 backedges. 0 proven. 460 refuted. 0 times theorem prover too weak. 119 trivial. 0 not checked. [2021-11-23 17:11:48,349 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:12:13,978 INFO L134 CoverageAnalysis]: Checked inductivity of 579 backedges. 376 proven. 84 refuted. 0 times theorem prover too weak. 119 trivial. 0 not checked. [2021-11-23 17:12:13,978 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:12:13,979 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1889356377] [2021-11-23 17:12:13,979 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1889356377] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:12:13,979 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [79964886] [2021-11-23 17:12:13,979 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:12:13,980 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:12:13,980 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:12:13,989 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:12:13,990 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (12)] Waiting until timeout for monitored process [2021-11-23 17:12:14,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:12:14,214 INFO L263 TraceCheckSpWp]: Trace formula consists of 516 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:12:14,223 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:12:15,103 INFO L134 CoverageAnalysis]: Checked inductivity of 579 backedges. 59 proven. 0 refuted. 0 times theorem prover too weak. 520 trivial. 0 not checked. [2021-11-23 17:12:15,103 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:12:15,103 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [79964886] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:12:15,103 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:12:15,104 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [10, 10] total 20 [2021-11-23 17:12:15,104 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1991899384] [2021-11-23 17:12:15,104 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:12:15,105 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 17:12:15,105 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:12:15,106 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 17:12:15,106 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=262, Unknown=0, NotChecked=0, Total=380 [2021-11-23 17:12:15,107 INFO L87 Difference]: Start difference. First operand 1962 states and 2186 transitions. Second operand has 4 states, 4 states have (on average 44.75) internal successors, (179), 4 states have internal predecessors, (179), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:12:20,979 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:12:20,979 INFO L93 Difference]: Finished difference Result 4460 states and 5110 transitions. [2021-11-23 17:12:20,979 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 17:12:20,980 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 44.75) internal successors, (179), 4 states have internal predecessors, (179), 0 states have call successors, (0), 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 455 [2021-11-23 17:12:20,981 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:12:20,998 INFO L225 Difference]: With dead ends: 4460 [2021-11-23 17:12:20,998 INFO L226 Difference]: Without dead ends: 2856 [2021-11-23 17:12:21,001 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1364 GetRequests, 1345 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 110 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=122, Invalid=298, Unknown=0, NotChecked=0, Total=420 [2021-11-23 17:12:21,002 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 355 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 820 mSolverCounterSat, 160 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 355 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 980 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 160 IncrementalHoareTripleChecker+Valid, 820 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.8s IncrementalHoareTripleChecker+Time [2021-11-23 17:12:21,002 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [355 Valid, 22 Invalid, 980 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [160 Valid, 820 Invalid, 0 Unknown, 0 Unchecked, 5.8s Time] [2021-11-23 17:12:21,008 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2856 states. [2021-11-23 17:12:21,067 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2856 to 2674. [2021-11-23 17:12:21,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2674 states, 2673 states have (on average 1.1290684624017957) internal successors, (3018), 2673 states have internal predecessors, (3018), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:12:21,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2674 states to 2674 states and 3018 transitions. [2021-11-23 17:12:21,085 INFO L78 Accepts]: Start accepts. Automaton has 2674 states and 3018 transitions. Word has length 455 [2021-11-23 17:12:21,087 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:12:21,087 INFO L470 AbstractCegarLoop]: Abstraction has 2674 states and 3018 transitions. [2021-11-23 17:12:21,087 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 44.75) internal successors, (179), 4 states have internal predecessors, (179), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:12:21,088 INFO L276 IsEmpty]: Start isEmpty. Operand 2674 states and 3018 transitions. [2021-11-23 17:12:21,095 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 586 [2021-11-23 17:12:21,096 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:12:21,096 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:12:21,102 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (12)] Forceful destruction successful, exit code 0 [2021-11-23 17:12:21,310 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (11)] Forceful destruction successful, exit code 0 [2021-11-23 17:12:21,499 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:12:21,500 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:12:21,500 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:12:21,500 INFO L85 PathProgramCache]: Analyzing trace with hash -1543859251, now seen corresponding path program 1 times [2021-11-23 17:12:21,503 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:12:21,503 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [51963239] [2021-11-23 17:12:21,503 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:12:21,503 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:12:21,503 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:12:21,504 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:12:21,505 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2021-11-23 17:12:21,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:12:21,778 INFO L263 TraceCheckSpWp]: Trace formula consists of 655 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 17:12:21,787 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:12:30,630 INFO L134 CoverageAnalysis]: Checked inductivity of 1003 backedges. 468 proven. 416 refuted. 0 times theorem prover too weak. 119 trivial. 0 not checked. [2021-11-23 17:12:30,630 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:12:56,689 INFO L134 CoverageAnalysis]: Checked inductivity of 1003 backedges. 815 proven. 69 refuted. 0 times theorem prover too weak. 119 trivial. 0 not checked. [2021-11-23 17:12:56,690 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:12:56,690 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [51963239] [2021-11-23 17:12:56,690 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [51963239] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:12:56,690 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [764149426] [2021-11-23 17:12:56,690 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:12:56,691 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:12:56,691 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:12:56,692 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:12:56,731 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (14)] Waiting until timeout for monitored process [2021-11-23 17:12:57,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:12:57,022 INFO L263 TraceCheckSpWp]: Trace formula consists of 655 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 17:12:57,029 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:12:58,961 INFO L134 CoverageAnalysis]: Checked inductivity of 1003 backedges. 468 proven. 15 refuted. 0 times theorem prover too weak. 520 trivial. 0 not checked. [2021-11-23 17:12:58,962 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:13:00,949 INFO L134 CoverageAnalysis]: Checked inductivity of 1003 backedges. 468 proven. 15 refuted. 0 times theorem prover too weak. 520 trivial. 0 not checked. [2021-11-23 17:13:00,949 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [764149426] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:13:00,949 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [321970284] [2021-11-23 17:13:00,950 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:13:00,950 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:13:00,950 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:13:00,951 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:13:00,952 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-23 17:13:01,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:13:01,234 INFO L263 TraceCheckSpWp]: Trace formula consists of 655 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:13:01,242 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:13:04,498 INFO L134 CoverageAnalysis]: Checked inductivity of 1003 backedges. 412 proven. 71 refuted. 0 times theorem prover too weak. 520 trivial. 0 not checked. [2021-11-23 17:13:04,499 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:13:07,409 INFO L134 CoverageAnalysis]: Checked inductivity of 1003 backedges. 483 proven. 0 refuted. 0 times theorem prover too weak. 520 trivial. 0 not checked. [2021-11-23 17:13:07,409 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [321970284] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-23 17:13:07,409 INFO L186 FreeRefinementEngine]: Found 1 perfect and 5 imperfect interpolant sequences. [2021-11-23 17:13:07,411 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [10, 10, 7, 7, 7] total 34 [2021-11-23 17:13:07,411 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [353324353] [2021-11-23 17:13:07,411 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:13:07,412 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:13:07,412 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:13:07,413 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:13:07,414 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=236, Invalid=886, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 17:13:07,414 INFO L87 Difference]: Start difference. First operand 2674 states and 3018 transitions. Second operand has 5 states, 5 states have (on average 61.8) internal successors, (309), 5 states have internal predecessors, (309), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:13:11,652 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:13:11,653 INFO L93 Difference]: Finished difference Result 5714 states and 6527 transitions. [2021-11-23 17:13:11,653 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 17:13:11,654 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 61.8) internal successors, (309), 5 states have internal predecessors, (309), 0 states have call successors, (0), 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 585 [2021-11-23 17:13:11,655 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:13:11,674 INFO L225 Difference]: With dead ends: 5714 [2021-11-23 17:13:11,675 INFO L226 Difference]: Without dead ends: 3398 [2021-11-23 17:13:11,679 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3506 GetRequests, 3473 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 431 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=259, Invalid=931, Unknown=0, NotChecked=0, Total=1190 [2021-11-23 17:13:11,682 INFO L933 BasicCegarLoop]: 39 mSDtfsCounter, 605 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 750 mSolverCounterSat, 245 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 605 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 995 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 245 IncrementalHoareTripleChecker+Valid, 750 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:13:11,683 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [605 Valid, 46 Invalid, 995 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [245 Valid, 750 Invalid, 0 Unknown, 0 Unchecked, 4.1s Time] [2021-11-23 17:13:11,688 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3398 states. [2021-11-23 17:13:11,754 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3398 to 3208. [2021-11-23 17:13:11,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3208 states, 3207 states have (on average 1.0863735578422202) internal successors, (3484), 3207 states have internal predecessors, (3484), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:13:11,771 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3208 states to 3208 states and 3484 transitions. [2021-11-23 17:13:11,772 INFO L78 Accepts]: Start accepts. Automaton has 3208 states and 3484 transitions. Word has length 585 [2021-11-23 17:13:11,773 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:13:11,773 INFO L470 AbstractCegarLoop]: Abstraction has 3208 states and 3484 transitions. [2021-11-23 17:13:11,774 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 61.8) internal successors, (309), 5 states have internal predecessors, (309), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:13:11,774 INFO L276 IsEmpty]: Start isEmpty. Operand 3208 states and 3484 transitions. [2021-11-23 17:13:11,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 644 [2021-11-23 17:13:11,783 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:13:11,784 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:13:11,834 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-23 17:13:12,022 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (13)] Forceful destruction successful, exit code 0 [2021-11-23 17:13:12,211 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (14)] Forceful destruction successful, exit code 0 [2021-11-23 17:13:12,410 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:13:12,410 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:13:12,410 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:13:12,411 INFO L85 PathProgramCache]: Analyzing trace with hash 1507099774, now seen corresponding path program 1 times [2021-11-23 17:13:12,413 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:13:12,413 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1853101666] [2021-11-23 17:13:12,413 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:13:12,414 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:13:12,414 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:13:12,417 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:13:12,421 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2021-11-23 17:13:12,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:13:12,722 INFO L263 TraceCheckSpWp]: Trace formula consists of 716 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 17:13:12,731 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:13:19,126 INFO L134 CoverageAnalysis]: Checked inductivity of 1083 backedges. 652 proven. 210 refuted. 0 times theorem prover too weak. 221 trivial. 0 not checked. [2021-11-23 17:13:19,126 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:13:48,627 INFO L134 CoverageAnalysis]: Checked inductivity of 1083 backedges. 862 proven. 0 refuted. 0 times theorem prover too weak. 221 trivial. 0 not checked. [2021-11-23 17:13:48,628 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:13:48,628 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1853101666] [2021-11-23 17:13:48,628 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1853101666] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-23 17:13:48,629 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 17:13:48,629 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [9] total 17 [2021-11-23 17:13:48,629 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [285452411] [2021-11-23 17:13:48,629 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:13:48,630 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-23 17:13:48,630 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:13:48,630 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-23 17:13:48,631 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=171, Unknown=0, NotChecked=0, Total=272 [2021-11-23 17:13:48,631 INFO L87 Difference]: Start difference. First operand 3208 states and 3484 transitions. Second operand has 9 states, 9 states have (on average 49.0) internal successors, (441), 9 states have internal predecessors, (441), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:13:53,733 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:13:53,733 INFO L93 Difference]: Finished difference Result 6211 states and 6761 transitions. [2021-11-23 17:13:53,738 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-23 17:13:53,739 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 49.0) internal successors, (441), 9 states have internal predecessors, (441), 0 states have call successors, (0), 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 643 [2021-11-23 17:13:53,740 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:13:53,758 INFO L225 Difference]: With dead ends: 6211 [2021-11-23 17:13:53,758 INFO L226 Difference]: Without dead ends: 3321 [2021-11-23 17:13:53,762 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1284 GetRequests, 1269 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 63 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=101, Invalid=171, Unknown=0, NotChecked=0, Total=272 [2021-11-23 17:13:53,763 INFO L933 BasicCegarLoop]: 242 mSDtfsCounter, 215 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 1008 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 215 SdHoareTripleChecker+Valid, 257 SdHoareTripleChecker+Invalid, 1011 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 1008 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:13:53,764 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [215 Valid, 257 Invalid, 1011 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 1008 Invalid, 0 Unknown, 0 Unchecked, 5.0s Time] [2021-11-23 17:13:53,769 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3321 states. [2021-11-23 17:13:53,835 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3321 to 3321. [2021-11-23 17:13:53,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3321 states, 3320 states have (on average 1.0834337349397591) internal successors, (3597), 3320 states have internal predecessors, (3597), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:13:53,851 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3321 states to 3321 states and 3597 transitions. [2021-11-23 17:13:53,852 INFO L78 Accepts]: Start accepts. Automaton has 3321 states and 3597 transitions. Word has length 643 [2021-11-23 17:13:53,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:13:53,853 INFO L470 AbstractCegarLoop]: Abstraction has 3321 states and 3597 transitions. [2021-11-23 17:13:53,853 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 49.0) internal successors, (441), 9 states have internal predecessors, (441), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:13:53,854 INFO L276 IsEmpty]: Start isEmpty. Operand 3321 states and 3597 transitions. [2021-11-23 17:13:53,862 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 671 [2021-11-23 17:13:53,862 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:13:53,863 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:13:53,885 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (16)] Forceful destruction successful, exit code 0 [2021-11-23 17:13:54,075 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:13:54,076 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:13:54,076 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:13:54,077 INFO L85 PathProgramCache]: Analyzing trace with hash 1928067848, now seen corresponding path program 1 times [2021-11-23 17:13:54,079 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:13:54,079 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1270115967] [2021-11-23 17:13:54,079 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:13:54,079 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:13:54,080 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:13:54,082 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:13:54,083 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (17)] Waiting until timeout for monitored process [2021-11-23 17:13:54,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:13:54,407 INFO L263 TraceCheckSpWp]: Trace formula consists of 754 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:13:54,413 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:13:56,002 INFO L134 CoverageAnalysis]: Checked inductivity of 1412 backedges. 771 proven. 353 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2021-11-23 17:13:56,002 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:13:57,856 INFO L134 CoverageAnalysis]: Checked inductivity of 1412 backedges. 1124 proven. 0 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2021-11-23 17:13:57,856 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:13:57,857 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1270115967] [2021-11-23 17:13:57,857 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1270115967] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-23 17:13:57,857 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 17:13:57,857 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3] total 5 [2021-11-23 17:13:57,858 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1715158294] [2021-11-23 17:13:57,858 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:13:57,859 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:13:57,859 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:13:57,860 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:13:57,860 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:13:57,860 INFO L87 Difference]: Start difference. First operand 3321 states and 3597 transitions. Second operand has 3 states, 3 states have (on average 133.66666666666666) internal successors, (401), 3 states have internal predecessors, (401), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:14:02,814 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:14:02,814 INFO L93 Difference]: Finished difference Result 7352 states and 8048 transitions. [2021-11-23 17:14:02,815 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:14:02,815 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 133.66666666666666) internal successors, (401), 3 states have internal predecessors, (401), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 670 [2021-11-23 17:14:02,816 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:14:02,839 INFO L225 Difference]: With dead ends: 7352 [2021-11-23 17:14:02,839 INFO L226 Difference]: Without dead ends: 4389 [2021-11-23 17:14:02,843 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1338 GetRequests, 1335 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:14:02,844 INFO L933 BasicCegarLoop]: 59 mSDtfsCounter, 69 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 428 mSolverCounterSat, 49 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 477 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 49 IncrementalHoareTripleChecker+Valid, 428 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.9s IncrementalHoareTripleChecker+Time [2021-11-23 17:14:02,845 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [69 Valid, 63 Invalid, 477 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [49 Valid, 428 Invalid, 0 Unknown, 0 Unchecked, 4.9s Time] [2021-11-23 17:14:02,850 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4389 states. [2021-11-23 17:14:02,926 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4389 to 4389. [2021-11-23 17:14:02,935 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4389 states, 4388 states have (on average 1.0799908842297175) internal successors, (4739), 4388 states have internal predecessors, (4739), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:14:02,946 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4389 states to 4389 states and 4739 transitions. [2021-11-23 17:14:02,947 INFO L78 Accepts]: Start accepts. Automaton has 4389 states and 4739 transitions. Word has length 670 [2021-11-23 17:14:02,948 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:14:02,948 INFO L470 AbstractCegarLoop]: Abstraction has 4389 states and 4739 transitions. [2021-11-23 17:14:02,948 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 133.66666666666666) internal successors, (401), 3 states have internal predecessors, (401), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:14:02,949 INFO L276 IsEmpty]: Start isEmpty. Operand 4389 states and 4739 transitions. [2021-11-23 17:14:02,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 826 [2021-11-23 17:14:02,961 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:14:02,962 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:14:02,984 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (17)] Forceful destruction successful, exit code 0 [2021-11-23 17:14:03,180 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:14:03,181 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:14:03,181 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:14:03,181 INFO L85 PathProgramCache]: Analyzing trace with hash -314084564, now seen corresponding path program 1 times [2021-11-23 17:14:03,184 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:14:03,185 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [115366146] [2021-11-23 17:14:03,185 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:14:03,185 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:14:03,185 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:14:03,186 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:14:03,188 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (18)] Waiting until timeout for monitored process [2021-11-23 17:14:03,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:14:03,503 INFO L263 TraceCheckSpWp]: Trace formula consists of 919 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:14:03,508 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:14:04,622 INFO L134 CoverageAnalysis]: Checked inductivity of 2059 backedges. 1310 proven. 0 refuted. 0 times theorem prover too weak. 749 trivial. 0 not checked. [2021-11-23 17:14:04,623 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:14:04,623 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:14:04,623 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [115366146] [2021-11-23 17:14:04,623 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [115366146] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:14:04,623 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:14:04,624 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:14:04,624 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1731393163] [2021-11-23 17:14:04,624 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:14:04,626 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:14:04,626 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:14:04,626 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:14:04,626 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:14:04,627 INFO L87 Difference]: Start difference. First operand 4389 states and 4739 transitions. Second operand has 3 states, 3 states have (on average 136.66666666666666) internal successors, (410), 3 states have internal predecessors, (410), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:14:07,067 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:14:07,067 INFO L93 Difference]: Finished difference Result 9488 states and 10301 transitions. [2021-11-23 17:14:07,088 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:14:07,089 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 136.66666666666666) internal successors, (410), 3 states have internal predecessors, (410), 0 states have call successors, (0), 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 825 [2021-11-23 17:14:07,090 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:14:07,118 INFO L225 Difference]: With dead ends: 9488 [2021-11-23 17:14:07,118 INFO L226 Difference]: Without dead ends: 5457 [2021-11-23 17:14:07,123 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 824 GetRequests, 823 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:14:07,124 INFO L933 BasicCegarLoop]: 222 mSDtfsCounter, 108 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 425 mSolverCounterSat, 47 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 108 SdHoareTripleChecker+Valid, 226 SdHoareTripleChecker+Invalid, 472 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 425 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-23 17:14:07,124 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [108 Valid, 226 Invalid, 472 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [47 Valid, 425 Invalid, 0 Unknown, 0 Unchecked, 2.4s Time] [2021-11-23 17:14:07,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5457 states. [2021-11-23 17:14:07,211 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5457 to 5279. [2021-11-23 17:14:07,222 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5279 states, 5278 states have (on average 1.063660477453581) internal successors, (5614), 5278 states have internal predecessors, (5614), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:14:07,231 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5279 states to 5279 states and 5614 transitions. [2021-11-23 17:14:07,231 INFO L78 Accepts]: Start accepts. Automaton has 5279 states and 5614 transitions. Word has length 825 [2021-11-23 17:14:07,232 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:14:07,232 INFO L470 AbstractCegarLoop]: Abstraction has 5279 states and 5614 transitions. [2021-11-23 17:14:07,233 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 136.66666666666666) internal successors, (410), 3 states have internal predecessors, (410), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:14:07,233 INFO L276 IsEmpty]: Start isEmpty. Operand 5279 states and 5614 transitions. [2021-11-23 17:14:07,245 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 844 [2021-11-23 17:14:07,245 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:14:07,246 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:14:07,273 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (18)] Forceful destruction successful, exit code 0 [2021-11-23 17:14:07,461 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:14:07,462 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:14:07,462 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:14:07,462 INFO L85 PathProgramCache]: Analyzing trace with hash 59177983, now seen corresponding path program 1 times [2021-11-23 17:14:07,466 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:14:07,466 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1103576055] [2021-11-23 17:14:07,466 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:14:07,466 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:14:07,467 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:14:07,468 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:14:07,479 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (19)] Waiting until timeout for monitored process [2021-11-23 17:14:07,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:14:07,822 INFO L263 TraceCheckSpWp]: Trace formula consists of 935 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 17:14:07,831 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:14:16,857 INFO L134 CoverageAnalysis]: Checked inductivity of 2077 backedges. 217 proven. 1521 refuted. 0 times theorem prover too weak. 339 trivial. 0 not checked. [2021-11-23 17:14:16,858 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:14:39,492 INFO L134 CoverageAnalysis]: Checked inductivity of 2077 backedges. 1209 proven. 529 refuted. 0 times theorem prover too weak. 339 trivial. 0 not checked. [2021-11-23 17:14:39,492 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:14:39,493 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1103576055] [2021-11-23 17:14:39,493 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1103576055] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:14:39,493 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [70456078] [2021-11-23 17:14:39,493 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:14:39,494 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:14:39,494 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:14:39,495 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:14:39,499 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (20)] Waiting until timeout for monitored process [2021-11-23 17:14:40,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:14:40,036 INFO L263 TraceCheckSpWp]: Trace formula consists of 935 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 17:14:40,043 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:14:43,286 INFO L134 CoverageAnalysis]: Checked inductivity of 2077 backedges. 1410 proven. 241 refuted. 0 times theorem prover too weak. 426 trivial. 0 not checked. [2021-11-23 17:14:43,286 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:14:46,538 INFO L134 CoverageAnalysis]: Checked inductivity of 2077 backedges. 1410 proven. 241 refuted. 0 times theorem prover too weak. 426 trivial. 0 not checked. [2021-11-23 17:14:46,538 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [70456078] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:14:46,538 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [768065916] [2021-11-23 17:14:46,538 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:14:46,538 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:14:46,539 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:14:46,540 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:14:46,540 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-23 17:14:46,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:14:46,839 INFO L263 TraceCheckSpWp]: Trace formula consists of 935 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 17:14:46,845 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:14:51,042 INFO L134 CoverageAnalysis]: Checked inductivity of 2077 backedges. 1399 proven. 93 refuted. 0 times theorem prover too weak. 585 trivial. 0 not checked. [2021-11-23 17:14:51,043 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:14:55,217 INFO L134 CoverageAnalysis]: Checked inductivity of 2077 backedges. 1399 proven. 93 refuted. 0 times theorem prover too weak. 585 trivial. 0 not checked. [2021-11-23 17:14:55,217 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [768065916] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:14:55,218 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:14:55,219 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 6, 6, 4, 4] total 26 [2021-11-23 17:14:55,220 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [290005127] [2021-11-23 17:14:55,220 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:14:55,225 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-23 17:14:55,225 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:14:55,226 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-23 17:14:55,227 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=491, Unknown=0, NotChecked=0, Total=650 [2021-11-23 17:14:55,228 INFO L87 Difference]: Start difference. First operand 5279 states and 5614 transitions. Second operand has 26 states, 26 states have (on average 64.42307692307692) internal successors, (1675), 26 states have internal predecessors, (1675), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:13,137 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:15:13,137 INFO L93 Difference]: Finished difference Result 11315 states and 12014 transitions. [2021-11-23 17:15:13,144 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-23 17:15:13,146 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 64.42307692307692) internal successors, (1675), 26 states have internal predecessors, (1675), 0 states have call successors, (0), 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 843 [2021-11-23 17:15:13,147 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:15:13,175 INFO L225 Difference]: With dead ends: 11315 [2021-11-23 17:15:13,175 INFO L226 Difference]: Without dead ends: 5290 [2021-11-23 17:15:13,182 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5085 GetRequests, 5039 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 580 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=488, Invalid=1768, Unknown=0, NotChecked=0, Total=2256 [2021-11-23 17:15:13,183 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 2183 mSDsluCounter, 159 mSDsCounter, 0 mSdLazyCounter, 11006 mSolverCounterSat, 149 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 14.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2183 SdHoareTripleChecker+Valid, 183 SdHoareTripleChecker+Invalid, 11155 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 149 IncrementalHoareTripleChecker+Valid, 11006 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 16.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:15:13,183 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2183 Valid, 183 Invalid, 11155 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [149 Valid, 11006 Invalid, 0 Unknown, 0 Unchecked, 16.1s Time] [2021-11-23 17:15:13,190 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5290 states. [2021-11-23 17:15:13,246 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5290 to 3832. [2021-11-23 17:15:13,251 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3832 states, 3831 states have (on average 1.0417645523362047) internal successors, (3991), 3831 states have internal predecessors, (3991), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:13,258 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3832 states to 3832 states and 3991 transitions. [2021-11-23 17:15:13,258 INFO L78 Accepts]: Start accepts. Automaton has 3832 states and 3991 transitions. Word has length 843 [2021-11-23 17:15:13,259 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:15:13,259 INFO L470 AbstractCegarLoop]: Abstraction has 3832 states and 3991 transitions. [2021-11-23 17:15:13,260 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 64.42307692307692) internal successors, (1675), 26 states have internal predecessors, (1675), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:13,260 INFO L276 IsEmpty]: Start isEmpty. Operand 3832 states and 3991 transitions. [2021-11-23 17:15:13,296 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 921 [2021-11-23 17:15:13,296 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:15:13,297 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:15:13,306 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (20)] Forceful destruction successful, exit code 0 [2021-11-23 17:15:13,525 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Ended with exit code 0 [2021-11-23 17:15:13,709 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (19)] Forceful destruction successful, exit code 0 [2021-11-23 17:15:13,898 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:15:13,898 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:15:13,898 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:15:13,899 INFO L85 PathProgramCache]: Analyzing trace with hash 1559946616, now seen corresponding path program 1 times [2021-11-23 17:15:13,902 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:15:13,902 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1860792171] [2021-11-23 17:15:13,903 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:15:13,903 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:15:13,903 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:15:13,904 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:15:13,906 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (22)] Waiting until timeout for monitored process [2021-11-23 17:15:14,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:15:14,271 INFO L263 TraceCheckSpWp]: Trace formula consists of 1021 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 17:15:14,281 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:15:16,917 INFO L134 CoverageAnalysis]: Checked inductivity of 2625 backedges. 119 proven. 2135 refuted. 0 times theorem prover too weak. 371 trivial. 0 not checked. [2021-11-23 17:15:16,917 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:15:21,729 INFO L134 CoverageAnalysis]: Checked inductivity of 2625 backedges. 1599 proven. 82 refuted. 0 times theorem prover too weak. 944 trivial. 0 not checked. [2021-11-23 17:15:21,729 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:15:21,729 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1860792171] [2021-11-23 17:15:21,729 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1860792171] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:15:21,729 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1355802258] [2021-11-23 17:15:21,729 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:15:21,729 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:15:21,730 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:15:21,730 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:15:21,748 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (23)] Waiting until timeout for monitored process [2021-11-23 17:15:22,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:15:22,221 INFO L263 TraceCheckSpWp]: Trace formula consists of 1021 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:15:22,227 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:15:23,416 INFO L134 CoverageAnalysis]: Checked inductivity of 2625 backedges. 119 proven. 0 refuted. 0 times theorem prover too weak. 2506 trivial. 0 not checked. [2021-11-23 17:15:23,416 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:15:23,417 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1355802258] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:15:23,417 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:15:23,418 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6, 5] total 12 [2021-11-23 17:15:23,418 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2098230137] [2021-11-23 17:15:23,418 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:15:23,419 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 17:15:23,419 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:15:23,419 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 17:15:23,420 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=90, Unknown=0, NotChecked=0, Total=132 [2021-11-23 17:15:23,420 INFO L87 Difference]: Start difference. First operand 3832 states and 3991 transitions. Second operand has 4 states, 4 states have (on average 50.0) internal successors, (200), 4 states have internal predecessors, (200), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:26,810 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:15:26,811 INFO L93 Difference]: Finished difference Result 8208 states and 8568 transitions. [2021-11-23 17:15:26,811 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 17:15:26,811 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 50.0) internal successors, (200), 4 states have internal predecessors, (200), 0 states have call successors, (0), 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 920 [2021-11-23 17:15:26,812 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:15:26,835 INFO L225 Difference]: With dead ends: 8208 [2021-11-23 17:15:26,835 INFO L226 Difference]: Without dead ends: 4556 [2021-11-23 17:15:26,839 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2759 GetRequests, 2748 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=46, Invalid=110, Unknown=0, NotChecked=0, Total=156 [2021-11-23 17:15:26,840 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 356 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 835 mSolverCounterSat, 79 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 356 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 914 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 79 IncrementalHoareTripleChecker+Valid, 835 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.3s IncrementalHoareTripleChecker+Time [2021-11-23 17:15:26,840 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [356 Valid, 18 Invalid, 914 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [79 Valid, 835 Invalid, 0 Unknown, 0 Unchecked, 3.3s Time] [2021-11-23 17:15:26,847 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4556 states. [2021-11-23 17:15:26,893 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4556 to 4010. [2021-11-23 17:15:26,897 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4010 states, 4009 states have (on average 1.038912446994263) internal successors, (4165), 4009 states have internal predecessors, (4165), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:26,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4010 states to 4010 states and 4165 transitions. [2021-11-23 17:15:26,902 INFO L78 Accepts]: Start accepts. Automaton has 4010 states and 4165 transitions. Word has length 920 [2021-11-23 17:15:26,902 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:15:26,903 INFO L470 AbstractCegarLoop]: Abstraction has 4010 states and 4165 transitions. [2021-11-23 17:15:26,903 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 50.0) internal successors, (200), 4 states have internal predecessors, (200), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:26,903 INFO L276 IsEmpty]: Start isEmpty. Operand 4010 states and 4165 transitions. [2021-11-23 17:15:26,917 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 944 [2021-11-23 17:15:26,917 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:15:26,918 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 5, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:15:26,942 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (22)] Forceful destruction successful, exit code 0 [2021-11-23 17:15:27,139 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (23)] Forceful destruction successful, exit code 0 [2021-11-23 17:15:27,337 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:15:27,338 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:15:27,338 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:15:27,338 INFO L85 PathProgramCache]: Analyzing trace with hash -1873306405, now seen corresponding path program 1 times [2021-11-23 17:15:27,342 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:15:27,342 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [944667917] [2021-11-23 17:15:27,342 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:15:27,342 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:15:27,342 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:15:27,344 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:15:27,346 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (24)] Waiting until timeout for monitored process [2021-11-23 17:15:27,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:15:27,777 INFO L263 TraceCheckSpWp]: Trace formula consists of 1043 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:15:27,782 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:15:29,727 INFO L134 CoverageAnalysis]: Checked inductivity of 2855 backedges. 2255 proven. 0 refuted. 0 times theorem prover too weak. 600 trivial. 0 not checked. [2021-11-23 17:15:29,727 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:15:29,728 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:15:29,728 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [944667917] [2021-11-23 17:15:29,728 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [944667917] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:15:29,728 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:15:29,729 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 17:15:29,729 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1044065616] [2021-11-23 17:15:29,729 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:15:29,730 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 17:15:29,730 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:15:29,731 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 17:15:29,731 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 17:15:29,732 INFO L87 Difference]: Start difference. First operand 4010 states and 4165 transitions. Second operand has 4 states, 4 states have (on average 116.75) internal successors, (467), 4 states have internal predecessors, (467), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:32,119 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:15:32,119 INFO L93 Difference]: Finished difference Result 7549 states and 7857 transitions. [2021-11-23 17:15:32,121 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 17:15:32,121 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 116.75) internal successors, (467), 4 states have internal predecessors, (467), 0 states have call successors, (0), 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 943 [2021-11-23 17:15:32,122 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:15:32,132 INFO L225 Difference]: With dead ends: 7549 [2021-11-23 17:15:32,133 INFO L226 Difference]: Without dead ends: 4010 [2021-11-23 17:15:32,137 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 942 GetRequests, 940 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 17:15:32,138 INFO L933 BasicCegarLoop]: 41 mSDtfsCounter, 128 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 817 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 128 SdHoareTripleChecker+Valid, 50 SdHoareTripleChecker+Invalid, 823 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 817 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-23 17:15:32,138 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [128 Valid, 50 Invalid, 823 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 817 Invalid, 0 Unknown, 0 Unchecked, 2.3s Time] [2021-11-23 17:15:32,144 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4010 states. [2021-11-23 17:15:32,222 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4010 to 4010. [2021-11-23 17:15:32,226 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4010 states, 4009 states have (on average 1.037914691943128) internal successors, (4161), 4009 states have internal predecessors, (4161), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:32,233 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4010 states to 4010 states and 4161 transitions. [2021-11-23 17:15:32,233 INFO L78 Accepts]: Start accepts. Automaton has 4010 states and 4161 transitions. Word has length 943 [2021-11-23 17:15:32,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:15:32,235 INFO L470 AbstractCegarLoop]: Abstraction has 4010 states and 4161 transitions. [2021-11-23 17:15:32,235 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 116.75) internal successors, (467), 4 states have internal predecessors, (467), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:32,235 INFO L276 IsEmpty]: Start isEmpty. Operand 4010 states and 4161 transitions. [2021-11-23 17:15:32,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 951 [2021-11-23 17:15:32,249 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:15:32,250 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 4, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:15:32,272 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (24)] Forceful destruction successful, exit code 0 [2021-11-23 17:15:32,466 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:15:32,466 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:15:32,467 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:15:32,467 INFO L85 PathProgramCache]: Analyzing trace with hash 1398431392, now seen corresponding path program 1 times [2021-11-23 17:15:32,470 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:15:32,471 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1140238738] [2021-11-23 17:15:32,471 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:15:32,471 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:15:32,471 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:15:32,472 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:15:32,473 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (25)] Waiting until timeout for monitored process [2021-11-23 17:15:32,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:15:32,876 INFO L263 TraceCheckSpWp]: Trace formula consists of 1059 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:15:32,886 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:15:35,570 INFO L134 CoverageAnalysis]: Checked inductivity of 3281 backedges. 1229 proven. 1594 refuted. 0 times theorem prover too weak. 458 trivial. 0 not checked. [2021-11-23 17:15:35,571 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:15:51,332 INFO L134 CoverageAnalysis]: Checked inductivity of 3281 backedges. 2120 proven. 130 refuted. 0 times theorem prover too weak. 1031 trivial. 0 not checked. [2021-11-23 17:15:51,332 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:15:51,332 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1140238738] [2021-11-23 17:15:51,333 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1140238738] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:15:51,333 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1108237243] [2021-11-23 17:15:51,333 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:15:51,333 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:15:51,333 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:15:51,334 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:15:51,337 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (26)] Waiting until timeout for monitored process [2021-11-23 17:15:51,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:15:51,769 INFO L263 TraceCheckSpWp]: Trace formula consists of 1059 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 17:15:51,775 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:15:54,018 INFO L134 CoverageAnalysis]: Checked inductivity of 3281 backedges. 1452 proven. 0 refuted. 0 times theorem prover too weak. 1829 trivial. 0 not checked. [2021-11-23 17:15:54,018 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:15:54,018 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1108237243] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:15:54,018 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:15:54,019 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6, 5] total 14 [2021-11-23 17:15:54,020 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1738531565] [2021-11-23 17:15:54,020 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:15:54,020 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:15:54,020 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:15:54,021 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:15:54,021 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=132, Unknown=0, NotChecked=0, Total=182 [2021-11-23 17:15:54,021 INFO L87 Difference]: Start difference. First operand 4010 states and 4161 transitions. Second operand has 6 states, 6 states have (on average 57.0) internal successors, (342), 6 states have internal predecessors, (342), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:55,904 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:15:55,904 INFO L93 Difference]: Finished difference Result 6020 states and 6268 transitions. [2021-11-23 17:15:55,912 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 17:15:55,912 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 57.0) internal successors, (342), 6 states have internal predecessors, (342), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 950 [2021-11-23 17:15:55,913 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:15:55,921 INFO L225 Difference]: With dead ends: 6020 [2021-11-23 17:15:55,921 INFO L226 Difference]: Without dead ends: 4010 [2021-11-23 17:15:55,924 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2847 GetRequests, 2835 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=50, Invalid=132, Unknown=0, NotChecked=0, Total=182 [2021-11-23 17:15:55,925 INFO L933 BasicCegarLoop]: 235 mSDtfsCounter, 54 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 564 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 251 SdHoareTripleChecker+Invalid, 572 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 564 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2021-11-23 17:15:55,925 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [54 Valid, 251 Invalid, 572 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 564 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2021-11-23 17:15:55,931 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4010 states. [2021-11-23 17:15:55,998 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4010 to 4010. [2021-11-23 17:15:56,001 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4010 states, 4009 states have (on average 1.0341731105013718) internal successors, (4146), 4009 states have internal predecessors, (4146), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:56,007 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4010 states to 4010 states and 4146 transitions. [2021-11-23 17:15:56,008 INFO L78 Accepts]: Start accepts. Automaton has 4010 states and 4146 transitions. Word has length 950 [2021-11-23 17:15:56,009 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:15:56,009 INFO L470 AbstractCegarLoop]: Abstraction has 4010 states and 4146 transitions. [2021-11-23 17:15:56,009 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 57.0) internal successors, (342), 6 states have internal predecessors, (342), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:56,009 INFO L276 IsEmpty]: Start isEmpty. Operand 4010 states and 4146 transitions. [2021-11-23 17:15:56,023 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1015 [2021-11-23 17:15:56,023 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:15:56,025 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 8, 8, 8, 7, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:15:56,039 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (26)] Forceful destruction successful, exit code 0 [2021-11-23 17:15:56,242 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (25)] Ended with exit code 0 [2021-11-23 17:15:56,427 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:15:56,428 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:15:56,428 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:15:56,428 INFO L85 PathProgramCache]: Analyzing trace with hash -1564192223, now seen corresponding path program 1 times [2021-11-23 17:15:56,432 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:15:56,432 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1344473304] [2021-11-23 17:15:56,432 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:15:56,433 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:15:56,433 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:15:56,433 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:15:56,435 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (27)] Waiting until timeout for monitored process [2021-11-23 17:15:56,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:15:56,806 INFO L263 TraceCheckSpWp]: Trace formula consists of 1123 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 17:15:56,813 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:15:59,587 INFO L134 CoverageAnalysis]: Checked inductivity of 3331 backedges. 134 proven. 2751 refuted. 0 times theorem prover too weak. 446 trivial. 0 not checked. [2021-11-23 17:15:59,588 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:16:04,827 INFO L134 CoverageAnalysis]: Checked inductivity of 3331 backedges. 2136 proven. 176 refuted. 0 times theorem prover too weak. 1019 trivial. 0 not checked. [2021-11-23 17:16:04,827 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:16:04,827 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1344473304] [2021-11-23 17:16:04,827 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1344473304] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:16:04,827 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [399001971] [2021-11-23 17:16:04,827 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:16:04,828 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:16:04,828 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:16:04,828 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:16:04,831 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (28)] Waiting until timeout for monitored process [2021-11-23 17:16:05,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:16:05,924 INFO L263 TraceCheckSpWp]: Trace formula consists of 1123 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 17:16:05,932 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:16:34,028 INFO L134 CoverageAnalysis]: Checked inductivity of 3331 backedges. 1777 proven. 176 refuted. 0 times theorem prover too weak. 1378 trivial. 0 not checked. [2021-11-23 17:16:34,029 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:16:38,937 INFO L134 CoverageAnalysis]: Checked inductivity of 3331 backedges. 1762 proven. 191 refuted. 0 times theorem prover too weak. 1378 trivial. 0 not checked. [2021-11-23 17:16:38,937 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [399001971] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:16:38,937 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1068856564] [2021-11-23 17:16:38,937 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:16:38,938 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:16:38,938 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:16:38,939 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:16:38,939 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2021-11-23 17:16:39,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:16:39,234 INFO L263 TraceCheckSpWp]: Trace formula consists of 1123 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 17:16:39,240 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:16:57,436 INFO L134 CoverageAnalysis]: Checked inductivity of 3331 backedges. 1938 proven. 75 refuted. 0 times theorem prover too weak. 1318 trivial. 0 not checked. [2021-11-23 17:16:57,437 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:16:59,636 INFO L134 CoverageAnalysis]: Checked inductivity of 3331 backedges. 2013 proven. 0 refuted. 0 times theorem prover too weak. 1318 trivial. 0 not checked. [2021-11-23 17:16:59,636 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1068856564] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-23 17:16:59,636 INFO L186 FreeRefinementEngine]: Found 1 perfect and 5 imperfect interpolant sequences. [2021-11-23 17:16:59,638 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6, 5, 5, 6, 4] total 18 [2021-11-23 17:16:59,639 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [397255203] [2021-11-23 17:16:59,639 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:16:59,640 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 17:16:59,640 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:16:59,641 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 17:16:59,641 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=208, Unknown=0, NotChecked=0, Total=306 [2021-11-23 17:16:59,641 INFO L87 Difference]: Start difference. First operand 4010 states and 4146 transitions. Second operand has 4 states, 4 states have (on average 133.25) internal successors, (533), 4 states have internal predecessors, (533), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:17:04,722 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:17:04,723 INFO L93 Difference]: Finished difference Result 6326 states and 6561 transitions. [2021-11-23 17:17:04,723 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 17:17:04,724 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 133.25) internal successors, (533), 4 states have internal predecessors, (533), 0 states have call successors, (0), 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 1014 [2021-11-23 17:17:04,725 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:17:04,733 INFO L225 Difference]: With dead ends: 6326 [2021-11-23 17:17:04,733 INFO L226 Difference]: Without dead ends: 4188 [2021-11-23 17:17:04,736 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6078 GetRequests, 6060 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=98, Invalid=208, Unknown=0, NotChecked=0, Total=306 [2021-11-23 17:17:04,737 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 125 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 415 mSolverCounterSat, 49 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 125 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 464 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 49 IncrementalHoareTripleChecker+Valid, 415 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:17:04,738 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [125 Valid, 10 Invalid, 464 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [49 Valid, 415 Invalid, 0 Unknown, 0 Unchecked, 5.0s Time] [2021-11-23 17:17:04,743 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4188 states. [2021-11-23 17:17:04,793 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4188 to 4010. [2021-11-23 17:17:04,798 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4010 states, 4009 states have (on average 1.0326764779246695) internal successors, (4140), 4009 states have internal predecessors, (4140), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:17:04,804 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4010 states to 4010 states and 4140 transitions. [2021-11-23 17:17:04,804 INFO L78 Accepts]: Start accepts. Automaton has 4010 states and 4140 transitions. Word has length 1014 [2021-11-23 17:17:04,805 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:17:04,806 INFO L470 AbstractCegarLoop]: Abstraction has 4010 states and 4140 transitions. [2021-11-23 17:17:04,806 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 133.25) internal successors, (533), 4 states have internal predecessors, (533), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:17:04,806 INFO L276 IsEmpty]: Start isEmpty. Operand 4010 states and 4140 transitions. [2021-11-23 17:17:04,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1060 [2021-11-23 17:17:04,819 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:17:04,820 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 6, 5, 4, 4, 4, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:17:04,829 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (28)] Forceful destruction successful, exit code 0 [2021-11-23 17:17:05,057 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2021-11-23 17:17:05,235 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (27)] Ended with exit code 0 [2021-11-23 17:17:05,425 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:17:05,426 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:17:05,426 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:17:05,426 INFO L85 PathProgramCache]: Analyzing trace with hash 417089854, now seen corresponding path program 1 times [2021-11-23 17:17:05,429 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:17:05,429 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1435657141] [2021-11-23 17:17:05,429 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:17:05,430 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:17:05,430 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:17:05,431 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:17:05,432 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (30)] Waiting until timeout for monitored process [2021-11-23 17:17:05,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:17:05,754 INFO L263 TraceCheckSpWp]: Trace formula consists of 1169 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 17:17:05,760 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:17:08,449 INFO L134 CoverageAnalysis]: Checked inductivity of 3569 backedges. 134 proven. 2957 refuted. 0 times theorem prover too weak. 478 trivial. 0 not checked. [2021-11-23 17:17:08,449 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:17:13,733 INFO L134 CoverageAnalysis]: Checked inductivity of 3569 backedges. 2297 proven. 221 refuted. 0 times theorem prover too weak. 1051 trivial. 0 not checked. [2021-11-23 17:17:13,733 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:17:13,733 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1435657141] [2021-11-23 17:17:13,733 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1435657141] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:17:13,733 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [697434116] [2021-11-23 17:17:13,733 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:17:13,733 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:17:13,734 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:17:13,734 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:17:13,735 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (31)] Waiting until timeout for monitored process [2021-11-23 17:17:14,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:17:14,184 INFO L263 TraceCheckSpWp]: Trace formula consists of 1169 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:17:14,190 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:17:15,543 INFO L134 CoverageAnalysis]: Checked inductivity of 3569 backedges. 921 proven. 0 refuted. 0 times theorem prover too weak. 2648 trivial. 0 not checked. [2021-11-23 17:17:15,543 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:17:15,544 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [697434116] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:17:15,544 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:17:15,545 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6, 5] total 10 [2021-11-23 17:17:15,546 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [399920447] [2021-11-23 17:17:15,546 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:17:15,547 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:17:15,547 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:17:15,548 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:17:15,548 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=59, Unknown=0, NotChecked=0, Total=90 [2021-11-23 17:17:15,549 INFO L87 Difference]: Start difference. First operand 4010 states and 4140 transitions. Second operand has 3 states, 3 states have (on average 102.33333333333333) internal successors, (307), 3 states have internal predecessors, (307), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:17:18,141 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.09s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:17:19,648 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:17:19,648 INFO L93 Difference]: Finished difference Result 6148 states and 6375 transitions. [2021-11-23 17:17:19,648 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:17:19,649 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 102.33333333333333) internal successors, (307), 3 states have internal predecessors, (307), 0 states have call successors, (0), 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 1059 [2021-11-23 17:17:19,650 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:17:19,658 INFO L225 Difference]: With dead ends: 6148 [2021-11-23 17:17:19,658 INFO L226 Difference]: Without dead ends: 4188 [2021-11-23 17:17:19,661 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3174 GetRequests, 3165 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=31, Invalid=59, Unknown=0, NotChecked=0, Total=90 [2021-11-23 17:17:19,662 INFO L933 BasicCegarLoop]: 40 mSDtfsCounter, 74 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 395 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 74 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 403 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 395 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:17:19,663 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [74 Valid, 44 Invalid, 403 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 395 Invalid, 0 Unknown, 0 Unchecked, 4.1s Time] [2021-11-23 17:17:19,669 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4188 states. [2021-11-23 17:17:19,727 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4188 to 4010. [2021-11-23 17:17:19,730 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4010 states, 4009 states have (on average 1.0319281616363183) internal successors, (4137), 4009 states have internal predecessors, (4137), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:17:19,737 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4010 states to 4010 states and 4137 transitions. [2021-11-23 17:17:19,737 INFO L78 Accepts]: Start accepts. Automaton has 4010 states and 4137 transitions. Word has length 1059 [2021-11-23 17:17:19,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:17:19,739 INFO L470 AbstractCegarLoop]: Abstraction has 4010 states and 4137 transitions. [2021-11-23 17:17:19,739 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 102.33333333333333) internal successors, (307), 3 states have internal predecessors, (307), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:17:19,739 INFO L276 IsEmpty]: Start isEmpty. Operand 4010 states and 4137 transitions. [2021-11-23 17:17:19,754 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1092 [2021-11-23 17:17:19,754 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:17:19,755 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 6, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:17:19,765 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (31)] Forceful destruction successful, exit code 0 [2021-11-23 17:17:19,970 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (30)] Forceful destruction successful, exit code 0 [2021-11-23 17:17:20,157 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:17:20,158 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:17:20,158 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:17:20,158 INFO L85 PathProgramCache]: Analyzing trace with hash -863128290, now seen corresponding path program 1 times [2021-11-23 17:17:20,162 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:17:20,162 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1538760496] [2021-11-23 17:17:20,162 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:17:20,162 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:17:20,162 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:17:20,166 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:17:20,167 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (32)] Waiting until timeout for monitored process [2021-11-23 17:17:20,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:17:20,489 INFO L263 TraceCheckSpWp]: Trace formula consists of 1201 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-23 17:17:20,496 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:17:28,926 INFO L134 CoverageAnalysis]: Checked inductivity of 3655 backedges. 5 proven. 3264 refuted. 0 times theorem prover too weak. 386 trivial. 0 not checked. [2021-11-23 17:17:28,926 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:17:47,320 INFO L134 CoverageAnalysis]: Checked inductivity of 3655 backedges. 2254 proven. 442 refuted. 0 times theorem prover too weak. 959 trivial. 0 not checked. [2021-11-23 17:17:47,321 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:17:47,321 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1538760496] [2021-11-23 17:17:47,321 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1538760496] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:17:47,321 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [153928958] [2021-11-23 17:17:47,321 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:17:47,321 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:17:47,321 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:17:47,322 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:17:47,323 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (33)] Waiting until timeout for monitored process [2021-11-23 17:17:48,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:17:48,290 INFO L263 TraceCheckSpWp]: Trace formula consists of 1201 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:17:48,298 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:15,327 INFO L134 CoverageAnalysis]: Checked inductivity of 3655 backedges. 1951 proven. 401 refuted. 0 times theorem prover too weak. 1303 trivial. 0 not checked. [2021-11-23 17:18:15,327 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:18:22,160 INFO L134 CoverageAnalysis]: Checked inductivity of 3655 backedges. 2002 proven. 350 refuted. 0 times theorem prover too weak. 1303 trivial. 0 not checked. [2021-11-23 17:18:22,161 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [153928958] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:18:22,161 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1807281489] [2021-11-23 17:18:22,161 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:22,161 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:18:22,161 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:18:22,162 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:18:22,163 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2021-11-23 17:18:22,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:22,485 INFO L263 TraceCheckSpWp]: Trace formula consists of 1201 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 17:18:22,492 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:46,397 INFO L134 CoverageAnalysis]: Checked inductivity of 3655 backedges. 2214 proven. 123 refuted. 0 times theorem prover too weak. 1318 trivial. 0 not checked. [2021-11-23 17:18:46,397 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:18:49,300 INFO L134 CoverageAnalysis]: Checked inductivity of 3655 backedges. 2214 proven. 123 refuted. 0 times theorem prover too weak. 1318 trivial. 0 not checked. [2021-11-23 17:18:49,301 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1807281489] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:18:49,301 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:18:49,303 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 8, 9, 4, 4] total 35 [2021-11-23 17:18:49,303 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1194349977] [2021-11-23 17:18:49,303 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:18:49,306 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-23 17:18:49,306 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:18:49,307 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-23 17:18:49,308 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=287, Invalid=903, Unknown=0, NotChecked=0, Total=1190 [2021-11-23 17:18:49,308 INFO L87 Difference]: Start difference. First operand 4010 states and 4137 transitions. Second operand has 35 states, 35 states have (on average 69.54285714285714) internal successors, (2434), 35 states have internal predecessors, (2434), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:19:26,125 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:19:26,126 INFO L93 Difference]: Finished difference Result 9565 states and 9863 transitions. [2021-11-23 17:19:26,133 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-11-23 17:19:26,134 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 69.54285714285714) internal successors, (2434), 35 states have internal predecessors, (2434), 0 states have call successors, (0), 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 1091 [2021-11-23 17:19:26,134 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:19:26,143 INFO L225 Difference]: With dead ends: 9565 [2021-11-23 17:19:26,143 INFO L226 Difference]: Without dead ends: 5666 [2021-11-23 17:19:26,149 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6592 GetRequests, 6523 SyntacticMatches, 7 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1234 ImplicationChecksByTransitivity, 14.8s TimeCoverageRelationStatistics Valid=992, Invalid=3040, Unknown=0, NotChecked=0, Total=4032 [2021-11-23 17:19:26,149 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 6053 mSDsluCounter, 251 mSDsCounter, 0 mSdLazyCounter, 10277 mSolverCounterSat, 249 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 24.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6053 SdHoareTripleChecker+Valid, 278 SdHoareTripleChecker+Invalid, 18162 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 249 IncrementalHoareTripleChecker+Valid, 10277 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 7636 IncrementalHoareTripleChecker+Unchecked, 27.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:19:26,150 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6053 Valid, 278 Invalid, 18162 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [249 Valid, 10277 Invalid, 0 Unknown, 7636 Unchecked, 27.0s Time] [2021-11-23 17:19:26,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5666 states. [2021-11-23 17:19:26,224 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5666 to 4835. [2021-11-23 17:19:26,228 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4835 states, 4834 states have (on average 1.0231692180388912) internal successors, (4946), 4834 states have internal predecessors, (4946), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:19:26,235 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4835 states to 4835 states and 4946 transitions. [2021-11-23 17:19:26,235 INFO L78 Accepts]: Start accepts. Automaton has 4835 states and 4946 transitions. Word has length 1091 [2021-11-23 17:19:26,236 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:19:26,237 INFO L470 AbstractCegarLoop]: Abstraction has 4835 states and 4946 transitions. [2021-11-23 17:19:26,237 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 69.54285714285714) internal successors, (2434), 35 states have internal predecessors, (2434), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:19:26,238 INFO L276 IsEmpty]: Start isEmpty. Operand 4835 states and 4946 transitions. [2021-11-23 17:19:26,254 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1168 [2021-11-23 17:19:26,254 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:19:26,255 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 7, 6, 5, 4, 4, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:19:26,268 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (33)] Forceful destruction successful, exit code 0 [2021-11-23 17:19:26,474 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (32)] Forceful destruction successful, exit code 0 [2021-11-23 17:19:26,688 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Ended with exit code 0 [2021-11-23 17:19:26,862 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:19:26,863 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:19:26,863 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:19:26,864 INFO L85 PathProgramCache]: Analyzing trace with hash 1939560933, now seen corresponding path program 1 times [2021-11-23 17:19:26,867 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:19:26,868 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [783144229] [2021-11-23 17:19:26,868 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:19:26,868 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:19:26,868 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:19:26,869 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:19:26,872 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (35)] Waiting until timeout for monitored process [2021-11-23 17:19:27,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:19:27,254 INFO L263 TraceCheckSpWp]: Trace formula consists of 1285 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 17:19:27,262 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:19:31,501 INFO L134 CoverageAnalysis]: Checked inductivity of 4482 backedges. 1028 proven. 2960 refuted. 0 times theorem prover too weak. 494 trivial. 0 not checked. [2021-11-23 17:19:31,502 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:19:41,778 INFO L134 CoverageAnalysis]: Checked inductivity of 4482 backedges. 2977 proven. 438 refuted. 0 times theorem prover too weak. 1067 trivial. 0 not checked. [2021-11-23 17:19:41,779 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:19:41,779 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [783144229] [2021-11-23 17:19:41,779 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [783144229] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:19:41,779 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1746277741] [2021-11-23 17:19:41,779 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:19:41,779 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:19:41,779 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:19:41,780 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:19:41,781 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (36)] Waiting until timeout for monitored process [2021-11-23 17:19:42,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:19:42,248 INFO L263 TraceCheckSpWp]: Trace formula consists of 1285 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:19:42,254 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:19:46,944 INFO L134 CoverageAnalysis]: Checked inductivity of 4482 backedges. 2437 proven. 82 refuted. 0 times theorem prover too weak. 1963 trivial. 0 not checked. [2021-11-23 17:19:46,944 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:19:50,355 INFO L134 CoverageAnalysis]: Checked inductivity of 4482 backedges. 1819 proven. 0 refuted. 0 times theorem prover too weak. 2663 trivial. 0 not checked. [2021-11-23 17:19:50,356 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1746277741] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-23 17:19:50,356 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-23 17:19:50,357 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6, 5, 7] total 16 [2021-11-23 17:19:50,357 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1392527884] [2021-11-23 17:19:50,358 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:19:50,358 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:19:50,358 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:19:50,359 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:19:50,359 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=189, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:19:50,359 INFO L87 Difference]: Start difference. First operand 4835 states and 4946 transitions. Second operand has 3 states, 3 states have (on average 133.66666666666666) internal successors, (401), 3 states have internal predecessors, (401), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:19:52,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:19:52,349 INFO L93 Difference]: Finished difference Result 6973 states and 7159 transitions. [2021-11-23 17:19:52,349 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:19:52,349 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 133.66666666666666) internal successors, (401), 3 states have internal predecessors, (401), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 1167 [2021-11-23 17:19:52,350 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:19:52,358 INFO L225 Difference]: With dead ends: 6973 [2021-11-23 17:19:52,358 INFO L226 Difference]: Without dead ends: 4835 [2021-11-23 17:19:52,361 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4664 GetRequests, 4650 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=51, Invalid=189, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:19:52,362 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 77 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 382 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 77 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 412 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 382 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:19:52,363 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [77 Valid, 31 Invalid, 412 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 382 Invalid, 0 Unknown, 0 Unchecked, 2.0s Time] [2021-11-23 17:19:52,368 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4835 states. [2021-11-23 17:19:52,429 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4835 to 4557. [2021-11-23 17:19:52,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4557 states, 4556 states have (on average 1.0164618086040387) internal successors, (4631), 4556 states have internal predecessors, (4631), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:19:52,440 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4557 states to 4557 states and 4631 transitions. [2021-11-23 17:19:52,440 INFO L78 Accepts]: Start accepts. Automaton has 4557 states and 4631 transitions. Word has length 1167 [2021-11-23 17:19:52,441 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:19:52,441 INFO L470 AbstractCegarLoop]: Abstraction has 4557 states and 4631 transitions. [2021-11-23 17:19:52,442 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 133.66666666666666) internal successors, (401), 3 states have internal predecessors, (401), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:19:52,442 INFO L276 IsEmpty]: Start isEmpty. Operand 4557 states and 4631 transitions. [2021-11-23 17:19:52,460 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1297 [2021-11-23 17:19:52,461 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:19:52,462 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 7, 6, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:19:52,485 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (35)] Forceful destruction successful, exit code 0 [2021-11-23 17:19:52,688 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (36)] Forceful destruction successful, exit code 0 [2021-11-23 17:19:52,878 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:19:52,878 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:19:52,878 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:19:52,878 INFO L85 PathProgramCache]: Analyzing trace with hash 1150631463, now seen corresponding path program 1 times [2021-11-23 17:19:52,884 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:19:52,885 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [835323881] [2021-11-23 17:19:52,885 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:19:52,885 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:19:52,885 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:19:52,886 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:19:52,906 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1914196a-f353-4974-afef-597ff3bc7fc7/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (37)] Waiting until timeout for monitored process [2021-11-23 17:19:53,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:19:53,297 INFO L263 TraceCheckSpWp]: Trace formula consists of 1415 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-23 17:19:53,306 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:20:04,500 INFO L134 CoverageAnalysis]: Checked inductivity of 4802 backedges. 1090 proven. 3007 refuted. 0 times theorem prover too weak. 705 trivial. 0 not checked. [2021-11-23 17:20:04,500 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:20:47,665 WARN L860 $PredicateComparison]: unable to prove that (bvslt (_ bv11 32) (bvadd (_ bv42 32) (bvsrem (bvadd (_ bv464909 32) (bvsdiv (bvsdiv (bvadd (_ bv4294967295 32) (bvsrem c_~a12~0 (_ bv26 32))) (_ bv5 32)) (_ bv5 32))) (_ bv34 32)))) is different from true