./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/eca-rers2012/Problem16_label38.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_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/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_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/config/TaipanReach.xml -i ../../sv-benchmarks/c/eca-rers2012/Problem16_label38.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/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_895075c3-ba1a-4a87-b718-88f71bcbf45c/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 bc6f3b983186b129fc2c8495f43645af8fd70d5de682a5c401850a1bca673b92 --- Real Ultimate output --- This is Ultimate 0.2.2-dev-6a47aea [2021-11-23 17:23:25,990 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 17:23:25,992 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 17:23:26,046 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 17:23:26,046 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 17:23:26,048 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 17:23:26,050 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 17:23:26,052 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 17:23:26,059 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 17:23:26,061 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 17:23:26,062 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 17:23:26,066 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 17:23:26,067 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 17:23:26,075 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 17:23:26,077 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 17:23:26,079 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 17:23:26,085 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 17:23:26,088 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 17:23:26,091 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 17:23:26,093 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 17:23:26,100 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 17:23:26,102 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 17:23:26,105 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 17:23:26,107 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 17:23:26,114 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 17:23:26,115 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 17:23:26,115 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 17:23:26,118 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 17:23:26,119 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 17:23:26,120 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 17:23:26,121 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 17:23:26,122 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 17:23:26,124 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 17:23:26,126 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 17:23:26,127 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 17:23:26,128 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 17:23:26,129 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 17:23:26,129 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 17:23:26,129 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 17:23:26,130 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 17:23:26,131 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 17:23:26,132 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 17:23:26,178 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 17:23:26,178 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 17:23:26,179 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 17:23:26,180 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 17:23:26,187 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 17:23:26,187 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 17:23:26,188 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 17:23:26,188 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 17:23:26,188 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 17:23:26,188 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 17:23:26,189 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 17:23:26,190 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 17:23:26,190 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 17:23:26,190 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 17:23:26,190 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 17:23:26,190 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 17:23:26,191 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 17:23:26,191 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 17:23:26,192 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 17:23:26,192 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 17:23:26,193 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 17:23:26,193 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 17:23:26,193 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 17:23:26,193 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 17:23:26,193 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 17:23:26,193 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 17:23:26,196 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 17:23:26,196 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 17:23:26,196 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 17:23:26,196 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 17:23:26,197 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 17:23:26,197 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 17:23:26,198 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:23:26,199 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 17:23:26,199 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 17:23:26,200 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 17:23:26,200 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 17:23:26,200 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 17:23:26,201 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 17:23:26,201 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 17:23:26,201 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 17:23:26,201 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_895075c3-ba1a-4a87-b718-88f71bcbf45c/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> bc6f3b983186b129fc2c8495f43645af8fd70d5de682a5c401850a1bca673b92 [2021-11-23 17:23:26,567 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 17:23:26,588 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 17:23:26,591 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 17:23:26,592 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 17:23:26,593 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 17:23:26,594 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/../../sv-benchmarks/c/eca-rers2012/Problem16_label38.c [2021-11-23 17:23:26,689 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/data/b75a98754/35e7b7a8121b4d6d9a65944e199b9d77/FLAG5ec58bd79 [2021-11-23 17:23:27,387 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 17:23:27,388 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/sv-benchmarks/c/eca-rers2012/Problem16_label38.c [2021-11-23 17:23:27,406 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/data/b75a98754/35e7b7a8121b4d6d9a65944e199b9d77/FLAG5ec58bd79 [2021-11-23 17:23:27,550 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/data/b75a98754/35e7b7a8121b4d6d9a65944e199b9d77 [2021-11-23 17:23:27,556 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 17:23:27,558 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 17:23:27,560 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 17:23:27,561 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 17:23:27,565 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 17:23:27,566 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:23:27" (1/1) ... [2021-11-23 17:23:27,568 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@378f8fdf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:23:27, skipping insertion in model container [2021-11-23 17:23:27,569 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:23:27" (1/1) ... [2021-11-23 17:23:27,577 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 17:23:27,675 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 17:23:27,930 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_895075c3-ba1a-4a87-b718-88f71bcbf45c/sv-benchmarks/c/eca-rers2012/Problem16_label38.c[1461,1474] [2021-11-23 17:23:28,454 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:23:28,463 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 17:23:28,477 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_895075c3-ba1a-4a87-b718-88f71bcbf45c/sv-benchmarks/c/eca-rers2012/Problem16_label38.c[1461,1474] [2021-11-23 17:23:28,728 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:23:28,746 INFO L208 MainTranslator]: Completed translation [2021-11-23 17:23:28,746 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:23:28 WrapperNode [2021-11-23 17:23:28,747 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 17:23:28,748 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 17:23:28,749 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 17:23:28,749 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 17:23:28,757 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:23:28" (1/1) ... [2021-11-23 17:23:28,808 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:23:28" (1/1) ... [2021-11-23 17:23:28,983 INFO L137 Inliner]: procedures = 15, calls = 9, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 1768 [2021-11-23 17:23:28,984 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 17:23:28,985 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 17:23:28,985 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 17:23:28,985 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 17:23:28,994 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:23:28" (1/1) ... [2021-11-23 17:23:28,995 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:23:28" (1/1) ... [2021-11-23 17:23:29,014 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:23:28" (1/1) ... [2021-11-23 17:23:29,014 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:23:28" (1/1) ... [2021-11-23 17:23:29,099 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:23:28" (1/1) ... [2021-11-23 17:23:29,130 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:23:28" (1/1) ... [2021-11-23 17:23:29,155 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:23:28" (1/1) ... [2021-11-23 17:23:29,170 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 17:23:29,171 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 17:23:29,171 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 17:23:29,172 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 17:23:29,173 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:23:28" (1/1) ... [2021-11-23 17:23:29,181 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:23:29,194 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:23:29,207 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 17:23:29,230 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 17:23:29,265 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 17:23:29,265 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 17:23:29,265 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 17:23:29,266 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 17:23:29,390 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 17:23:29,392 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 17:23:31,458 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 17:23:31,508 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 17:23:31,513 INFO L158 Benchmark]: Toolchain (without parser) took 3953.11ms. Allocated memory was 130.0MB in the beginning and 228.6MB in the end (delta: 98.6MB). Free memory was 89.3MB in the beginning and 129.5MB in the end (delta: -40.2MB). Peak memory consumption was 80.4MB. Max. memory is 16.1GB. [2021-11-23 17:23:31,515 INFO L158 Benchmark]: CDTParser took 0.31ms. Allocated memory is still 81.8MB. Free memory was 51.8MB in the beginning and 51.8MB in the end (delta: 26.7kB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-23 17:23:31,516 INFO L158 Benchmark]: CACSL2BoogieTranslator took 1186.89ms. Allocated memory is still 130.0MB. Free memory was 89.3MB in the beginning and 56.6MB in the end (delta: 32.7MB). Peak memory consumption was 31.5MB. Max. memory is 16.1GB. [2021-11-23 17:23:31,517 INFO L158 Benchmark]: Boogie Procedure Inliner took 235.44ms. Allocated memory is still 130.0MB. Free memory was 56.6MB in the beginning and 86.0MB in the end (delta: -29.4MB). Peak memory consumption was 24.0MB. Max. memory is 16.1GB. [2021-11-23 17:23:31,518 INFO L158 Benchmark]: Boogie Preprocessor took 185.26ms. Allocated memory is still 130.0MB. Free memory was 86.0MB in the beginning and 73.2MB in the end (delta: 12.8MB). Peak memory consumption was 12.6MB. Max. memory is 16.1GB. [2021-11-23 17:23:31,519 INFO L158 Benchmark]: RCFGBuilder took 2339.09ms. Allocated memory was 130.0MB in the beginning and 228.6MB in the end (delta: 98.6MB). Free memory was 73.2MB in the beginning and 129.5MB in the end (delta: -56.4MB). Peak memory consumption was 64.2MB. Max. memory is 16.1GB. [2021-11-23 17:23:31,528 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.31ms. Allocated memory is still 81.8MB. Free memory was 51.8MB in the beginning and 51.8MB in the end (delta: 26.7kB). There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 1186.89ms. Allocated memory is still 130.0MB. Free memory was 89.3MB in the beginning and 56.6MB in the end (delta: 32.7MB). Peak memory consumption was 31.5MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 235.44ms. Allocated memory is still 130.0MB. Free memory was 56.6MB in the beginning and 86.0MB in the end (delta: -29.4MB). Peak memory consumption was 24.0MB. Max. memory is 16.1GB. * Boogie Preprocessor took 185.26ms. Allocated memory is still 130.0MB. Free memory was 86.0MB in the beginning and 73.2MB in the end (delta: 12.8MB). Peak memory consumption was 12.6MB. Max. memory is 16.1GB. * RCFGBuilder took 2339.09ms. Allocated memory was 130.0MB in the beginning and 228.6MB in the end (delta: 98.6MB). Free memory was 73.2MB in the beginning and 129.5MB in the end (delta: -56.4MB). Peak memory consumption was 64.2MB. 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 17:23:31,558 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/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_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/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_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/config/TaipanReach.xml -i ../../sv-benchmarks/c/eca-rers2012/Problem16_label38.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/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_895075c3-ba1a-4a87-b718-88f71bcbf45c/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 bc6f3b983186b129fc2c8495f43645af8fd70d5de682a5c401850a1bca673b92 --- Real Ultimate output --- This is Ultimate 0.2.2-dev-6a47aea [2021-11-23 17:23:34,114 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 17:23:34,116 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 17:23:34,153 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 17:23:34,154 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 17:23:34,155 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 17:23:34,157 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 17:23:34,160 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 17:23:34,162 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 17:23:34,163 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 17:23:34,165 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 17:23:34,166 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 17:23:34,167 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 17:23:34,168 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 17:23:34,170 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 17:23:34,172 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 17:23:34,173 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 17:23:34,175 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 17:23:34,177 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 17:23:34,180 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 17:23:34,182 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 17:23:34,184 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 17:23:34,185 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 17:23:34,186 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 17:23:34,190 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 17:23:34,191 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 17:23:34,192 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 17:23:34,193 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 17:23:34,193 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 17:23:34,195 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 17:23:34,196 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 17:23:34,197 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 17:23:34,197 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 17:23:34,198 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 17:23:34,200 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 17:23:34,200 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 17:23:34,201 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 17:23:34,201 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 17:23:34,201 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 17:23:34,202 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 17:23:34,203 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 17:23:34,204 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2021-11-23 17:23:34,230 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 17:23:34,231 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 17:23:34,231 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 17:23:34,231 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 17:23:34,232 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 17:23:34,232 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 17:23:34,232 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 17:23:34,233 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 17:23:34,233 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 17:23:34,233 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 17:23:34,233 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 17:23:34,233 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 17:23:34,234 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 17:23:34,234 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 17:23:34,235 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 17:23:34,235 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 17:23:34,235 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 17:23:34,235 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 17:23:34,235 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 17:23:34,236 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-23 17:23:34,236 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-23 17:23:34,236 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-23 17:23:34,236 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 17:23:34,236 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 17:23:34,237 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 17:23:34,237 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 17:23:34,237 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 17:23:34,237 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-23 17:23:34,237 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 17:23:34,238 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:23:34,238 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 17:23:34,238 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 17:23:34,238 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 17:23:34,238 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-23 17:23:34,239 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-23 17:23:34,239 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 17:23:34,239 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 17:23:34,239 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 17:23:34,239 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_895075c3-ba1a-4a87-b718-88f71bcbf45c/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> bc6f3b983186b129fc2c8495f43645af8fd70d5de682a5c401850a1bca673b92 [2021-11-23 17:23:34,593 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 17:23:34,621 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 17:23:34,625 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 17:23:34,626 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 17:23:34,627 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 17:23:34,629 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/../../sv-benchmarks/c/eca-rers2012/Problem16_label38.c [2021-11-23 17:23:34,709 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/data/a6e5191a7/29266d07cf884b76aac115aefacafa89/FLAGda8bc300a [2021-11-23 17:23:35,484 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 17:23:35,485 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/sv-benchmarks/c/eca-rers2012/Problem16_label38.c [2021-11-23 17:23:35,506 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/data/a6e5191a7/29266d07cf884b76aac115aefacafa89/FLAGda8bc300a [2021-11-23 17:23:35,670 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/data/a6e5191a7/29266d07cf884b76aac115aefacafa89 [2021-11-23 17:23:35,672 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 17:23:35,675 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 17:23:35,676 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 17:23:35,676 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 17:23:35,680 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 17:23:35,681 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:23:35" (1/1) ... [2021-11-23 17:23:35,683 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1af0c97e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:23:35, skipping insertion in model container [2021-11-23 17:23:35,683 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:23:35" (1/1) ... [2021-11-23 17:23:35,691 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 17:23:35,792 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 17:23:36,006 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_895075c3-ba1a-4a87-b718-88f71bcbf45c/sv-benchmarks/c/eca-rers2012/Problem16_label38.c[1461,1474] [2021-11-23 17:23:36,651 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:23:36,662 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 17:23:36,686 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_895075c3-ba1a-4a87-b718-88f71bcbf45c/sv-benchmarks/c/eca-rers2012/Problem16_label38.c[1461,1474] [2021-11-23 17:23:36,937 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:23:36,955 INFO L208 MainTranslator]: Completed translation [2021-11-23 17:23:36,955 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:23:36 WrapperNode [2021-11-23 17:23:36,956 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 17:23:36,957 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 17:23:36,957 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 17:23:36,957 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 17:23:36,986 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:23:36" (1/1) ... [2021-11-23 17:23:37,028 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:23:36" (1/1) ... [2021-11-23 17:23:37,118 INFO L137 Inliner]: procedures = 15, calls = 9, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 1765 [2021-11-23 17:23:37,119 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 17:23:37,120 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 17:23:37,121 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 17:23:37,121 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 17:23:37,129 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:23:36" (1/1) ... [2021-11-23 17:23:37,130 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:23:36" (1/1) ... [2021-11-23 17:23:37,139 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:23:36" (1/1) ... [2021-11-23 17:23:37,139 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:23:36" (1/1) ... [2021-11-23 17:23:37,204 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:23:36" (1/1) ... [2021-11-23 17:23:37,232 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:23:36" (1/1) ... [2021-11-23 17:23:37,243 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:23:36" (1/1) ... [2021-11-23 17:23:37,296 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 17:23:37,297 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 17:23:37,297 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 17:23:37,297 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 17:23:37,298 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:23:36" (1/1) ... [2021-11-23 17:23:37,315 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:23:37,326 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:23:37,337 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 17:23:37,366 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 17:23:37,390 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 17:23:37,391 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-23 17:23:37,391 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 17:23:37,391 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 17:23:37,479 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 17:23:37,483 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 17:23:46,523 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 17:23:46,547 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 17:23:46,547 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-23 17:23:46,552 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 05:23:46 BoogieIcfgContainer [2021-11-23 17:23:46,552 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 17:23:46,556 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 17:23:46,556 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 17:23:46,559 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 17:23:46,560 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 05:23:35" (1/3) ... [2021-11-23 17:23:46,561 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@38c3b09b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 05:23:46, skipping insertion in model container [2021-11-23 17:23:46,561 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:23:36" (2/3) ... [2021-11-23 17:23:46,561 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@38c3b09b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 05:23:46, skipping insertion in model container [2021-11-23 17:23:46,561 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 05:23:46" (3/3) ... [2021-11-23 17:23:46,563 INFO L111 eAbstractionObserver]: Analyzing ICFG Problem16_label38.c [2021-11-23 17:23:46,570 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 17:23:46,570 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 17:23:46,647 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 17:23:46,656 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 17:23:46,656 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 17:23:46,700 INFO L276 IsEmpty]: Start isEmpty. Operand has 396 states, 394 states have (on average 1.8350253807106598) internal successors, (723), 395 states have internal predecessors, (723), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:23:46,706 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-23 17:23:46,706 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:23:46,707 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:23:46,708 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:23:46,713 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:23:46,714 INFO L85 PathProgramCache]: Analyzing trace with hash -988188511, now seen corresponding path program 1 times [2021-11-23 17:23:46,752 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:23:46,753 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1649941498] [2021-11-23 17:23:46,753 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:23:46,754 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:23:46,754 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:23:46,760 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:23:46,792 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-23 17:23:46,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:23:46,842 INFO L263 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:23:46,846 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:46,955 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 17:23:46,955 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:23:46,956 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:23:46,957 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1649941498] [2021-11-23 17:23:46,957 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1649941498] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:23:46,958 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:23:46,958 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 17:23:46,960 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [885493164] [2021-11-23 17:23:46,961 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:23:46,965 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:23:46,966 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:23:46,994 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:23:46,995 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:23:46,998 INFO L87 Difference]: Start difference. First operand has 396 states, 394 states have (on average 1.8350253807106598) internal successors, (723), 395 states have internal predecessors, (723), 0 states have call successors, (0), 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 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:23:57,958 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:23:57,958 INFO L93 Difference]: Finished difference Result 1122 states and 2103 transitions. [2021-11-23 17:23:57,959 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:23:57,960 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-11-23 17:23:57,961 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:23:57,981 INFO L225 Difference]: With dead ends: 1122 [2021-11-23 17:23:57,981 INFO L226 Difference]: Without dead ends: 662 [2021-11-23 17:23:57,986 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:23:57,991 INFO L933 BasicCegarLoop]: 282 mSDtfsCounter, 334 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 1021 mSolverCounterSat, 278 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 334 SdHoareTripleChecker+Valid, 290 SdHoareTripleChecker+Invalid, 1299 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 278 IncrementalHoareTripleChecker+Valid, 1021 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 10.8s IncrementalHoareTripleChecker+Time [2021-11-23 17:23:57,992 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [334 Valid, 290 Invalid, 1299 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [278 Valid, 1021 Invalid, 0 Unknown, 0 Unchecked, 10.8s Time] [2021-11-23 17:23:58,011 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 662 states. [2021-11-23 17:23:58,066 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 662 to 662. [2021-11-23 17:23:58,069 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 662 states, 661 states have (on average 1.4826021180030258) internal successors, (980), 661 states have internal predecessors, (980), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:23:58,073 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 662 states to 662 states and 980 transitions. [2021-11-23 17:23:58,075 INFO L78 Accepts]: Start accepts. Automaton has 662 states and 980 transitions. Word has length 11 [2021-11-23 17:23:58,075 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:23:58,075 INFO L470 AbstractCegarLoop]: Abstraction has 662 states and 980 transitions. [2021-11-23 17:23:58,076 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:23:58,076 INFO L276 IsEmpty]: Start isEmpty. Operand 662 states and 980 transitions. [2021-11-23 17:23:58,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-11-23 17:23:58,080 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:23:58,080 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:23:58,100 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-23 17:23:58,296 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:23:58,300 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:23:58,300 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:23:58,301 INFO L85 PathProgramCache]: Analyzing trace with hash 1713745712, now seen corresponding path program 1 times [2021-11-23 17:23:58,304 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:23:58,305 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [982813718] [2021-11-23 17:23:58,305 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:23:58,306 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:23:58,306 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:23:58,309 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:23:58,315 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-23 17:23:58,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:23:58,418 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:23:58,421 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:58,750 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:58,750 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:23:58,751 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:23:58,751 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [982813718] [2021-11-23 17:23:58,751 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [982813718] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:23:58,751 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:23:58,752 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 17:23:58,752 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [517274207] [2021-11-23 17:23:58,752 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:23:58,754 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:23:58,754 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:23:58,755 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:23:58,755 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:23:58,755 INFO L87 Difference]: Start difference. First operand 662 states and 980 transitions. Second operand has 3 states, 3 states have (on average 27.666666666666668) internal successors, (83), 2 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:24:06,160 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:24:06,160 INFO L93 Difference]: Finished difference Result 1651 states and 2341 transitions. [2021-11-23 17:24:06,160 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:24:06,161 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.666666666666668) internal successors, (83), 2 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 83 [2021-11-23 17:24:06,161 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:24:06,168 INFO L225 Difference]: With dead ends: 1651 [2021-11-23 17:24:06,169 INFO L226 Difference]: Without dead ends: 991 [2021-11-23 17:24:06,173 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 81 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 17:24:06,175 INFO L933 BasicCegarLoop]: 244 mSDtfsCounter, 260 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 945 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 260 SdHoareTripleChecker+Valid, 249 SdHoareTripleChecker+Invalid, 968 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 945 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.3s IncrementalHoareTripleChecker+Time [2021-11-23 17:24:06,176 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [260 Valid, 249 Invalid, 968 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 945 Invalid, 0 Unknown, 0 Unchecked, 7.3s Time] [2021-11-23 17:24:06,181 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 991 states. [2021-11-23 17:24:06,218 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 991 to 991. [2021-11-23 17:24:06,220 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 991 states, 990 states have (on average 1.3525252525252525) internal successors, (1339), 990 states have internal predecessors, (1339), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:24:06,225 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 991 states to 991 states and 1339 transitions. [2021-11-23 17:24:06,226 INFO L78 Accepts]: Start accepts. Automaton has 991 states and 1339 transitions. Word has length 83 [2021-11-23 17:24:06,226 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:24:06,227 INFO L470 AbstractCegarLoop]: Abstraction has 991 states and 1339 transitions. [2021-11-23 17:24:06,227 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.666666666666668) internal successors, (83), 2 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:24:06,227 INFO L276 IsEmpty]: Start isEmpty. Operand 991 states and 1339 transitions. [2021-11-23 17:24:06,231 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2021-11-23 17:24:06,231 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:24:06,232 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:24:06,243 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-11-23 17:24:06,438 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:24:06,438 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:24:06,439 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:24:06,439 INFO L85 PathProgramCache]: Analyzing trace with hash -910165357, now seen corresponding path program 1 times [2021-11-23 17:24:06,440 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:24:06,440 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [143849599] [2021-11-23 17:24:06,440 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:24:06,440 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:24:06,440 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:24:06,453 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:24:06,455 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-23 17:24:06,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:24:06,547 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:24:06,551 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:24:06,771 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:24:06,772 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:24:06,772 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:24:06,772 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [143849599] [2021-11-23 17:24:06,772 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [143849599] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:24:06,773 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:24:06,773 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:24:06,773 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1571779438] [2021-11-23 17:24:06,773 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:24:06,774 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:24:06,774 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:24:06,775 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:24:06,775 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:24:06,776 INFO L87 Difference]: Start difference. First operand 991 states and 1339 transitions. Second operand has 3 states, 3 states have (on average 32.666666666666664) internal successors, (98), 3 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:24:16,903 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:24:16,903 INFO L93 Difference]: Finished difference Result 1980 states and 2911 transitions. [2021-11-23 17:24:16,904 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:24:16,904 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 32.666666666666664) internal successors, (98), 3 states have internal predecessors, (98), 0 states have call successors, (0), 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 98 [2021-11-23 17:24:16,905 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:24:16,913 INFO L225 Difference]: With dead ends: 1980 [2021-11-23 17:24:16,913 INFO L226 Difference]: Without dead ends: 1320 [2021-11-23 17:24:16,915 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 96 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 17:24:16,917 INFO L933 BasicCegarLoop]: 533 mSDtfsCounter, 373 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 796 mSolverCounterSat, 388 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 373 SdHoareTripleChecker+Valid, 539 SdHoareTripleChecker+Invalid, 1184 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 388 IncrementalHoareTripleChecker+Valid, 796 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 10.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:24:16,917 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [373 Valid, 539 Invalid, 1184 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [388 Valid, 796 Invalid, 0 Unknown, 0 Unchecked, 10.0s Time] [2021-11-23 17:24:16,920 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1320 states. [2021-11-23 17:24:16,947 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1320 to 1320. [2021-11-23 17:24:16,950 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1320 states, 1319 states have (on average 1.3146322971948445) internal successors, (1734), 1319 states have internal predecessors, (1734), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:24:16,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1320 states to 1320 states and 1734 transitions. [2021-11-23 17:24:16,955 INFO L78 Accepts]: Start accepts. Automaton has 1320 states and 1734 transitions. Word has length 98 [2021-11-23 17:24:16,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:24:16,956 INFO L470 AbstractCegarLoop]: Abstraction has 1320 states and 1734 transitions. [2021-11-23 17:24:16,957 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 32.666666666666664) internal successors, (98), 3 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:24:16,957 INFO L276 IsEmpty]: Start isEmpty. Operand 1320 states and 1734 transitions. [2021-11-23 17:24:16,962 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2021-11-23 17:24:16,963 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:24:16,963 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:24:16,988 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-23 17:24:17,175 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:24:17,175 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:24:17,176 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:24:17,176 INFO L85 PathProgramCache]: Analyzing trace with hash -516618222, now seen corresponding path program 1 times [2021-11-23 17:24:17,178 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:24:17,178 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2111587641] [2021-11-23 17:24:17,178 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:24:17,178 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:24:17,179 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:24:17,180 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:24:17,197 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-11-23 17:24:17,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:24:17,285 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:24:17,289 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:24:18,404 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:24:18,404 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:24:18,404 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:24:18,405 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2111587641] [2021-11-23 17:24:18,405 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2111587641] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:24:18,405 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:24:18,405 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 17:24:18,406 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [998659279] [2021-11-23 17:24:18,406 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:24:18,406 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:24:18,407 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:24:18,407 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:24:18,407 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:24:18,408 INFO L87 Difference]: Start difference. First operand 1320 states and 1734 transitions. Second operand has 3 states, 3 states have (on average 45.333333333333336) internal successors, (136), 2 states have internal predecessors, (136), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:24:26,155 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:24:26,155 INFO L93 Difference]: Finished difference Result 2638 states and 3466 transitions. [2021-11-23 17:24:26,156 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:24:26,156 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 45.333333333333336) internal successors, (136), 2 states have internal predecessors, (136), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 136 [2021-11-23 17:24:26,157 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:24:26,166 INFO L225 Difference]: With dead ends: 2638 [2021-11-23 17:24:26,166 INFO L226 Difference]: Without dead ends: 1649 [2021-11-23 17:24:26,168 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 134 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 17:24:26,169 INFO L933 BasicCegarLoop]: 267 mSDtfsCounter, 206 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 921 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 206 SdHoareTripleChecker+Valid, 272 SdHoareTripleChecker+Invalid, 944 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 921 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.7s IncrementalHoareTripleChecker+Time [2021-11-23 17:24:26,170 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [206 Valid, 272 Invalid, 944 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 921 Invalid, 0 Unknown, 0 Unchecked, 7.7s Time] [2021-11-23 17:24:26,173 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1649 states. [2021-11-23 17:24:26,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1649 to 1649. [2021-11-23 17:24:26,206 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1649 states, 1648 states have (on average 1.2554611650485437) internal successors, (2069), 1648 states have internal predecessors, (2069), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:24:26,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1649 states to 1649 states and 2069 transitions. [2021-11-23 17:24:26,211 INFO L78 Accepts]: Start accepts. Automaton has 1649 states and 2069 transitions. Word has length 136 [2021-11-23 17:24:26,212 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:24:26,212 INFO L470 AbstractCegarLoop]: Abstraction has 1649 states and 2069 transitions. [2021-11-23 17:24:26,213 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 45.333333333333336) internal successors, (136), 2 states have internal predecessors, (136), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:24:26,213 INFO L276 IsEmpty]: Start isEmpty. Operand 1649 states and 2069 transitions. [2021-11-23 17:24:26,217 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 193 [2021-11-23 17:24:26,217 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:24:26,218 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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 17:24:26,232 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-11-23 17:24:26,429 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:24:26,429 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:24:26,430 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:24:26,430 INFO L85 PathProgramCache]: Analyzing trace with hash 1332282649, now seen corresponding path program 1 times [2021-11-23 17:24:26,432 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:24:26,432 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1466028807] [2021-11-23 17:24:26,432 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:24:26,432 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:24:26,433 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:24:26,438 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:24:26,477 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-11-23 17:24:26,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:24:26,619 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 17:24:26,624 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:24:28,079 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 47 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:24:28,079 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:24:32,381 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 47 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:24:32,382 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:24:32,382 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1466028807] [2021-11-23 17:24:32,382 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1466028807] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:24:32,382 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [220315066] [2021-11-23 17:24:32,383 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:24:32,383 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:24:32,383 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:24:32,388 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:24:32,389 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (7)] Waiting until timeout for monitored process [2021-11-23 17:24:32,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:24:32,530 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 17:24:32,534 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:24:34,581 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 103 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:24:34,581 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:24:34,582 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [220315066] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:24:34,582 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:24:34,582 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [3, 3] total 11 [2021-11-23 17:24:34,582 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [699404799] [2021-11-23 17:24:34,582 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:24:34,583 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 17:24:34,583 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:24:34,584 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 17:24:34,584 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2021-11-23 17:24:34,584 INFO L87 Difference]: Start difference. First operand 1649 states and 2069 transitions. Second operand has 7 states, 7 states have (on average 27.428571428571427) internal successors, (192), 7 states have internal predecessors, (192), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:24:41,307 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.11s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:24:42,745 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.44s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:24:47,737 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.86s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:25:05,455 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.14s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:25:07,457 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:25:07,578 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:25:07,578 INFO L93 Difference]: Finished difference Result 3730 states and 4919 transitions. [2021-11-23 17:25:07,579 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-23 17:25:07,579 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 27.428571428571427) internal successors, (192), 7 states have internal predecessors, (192), 0 states have call successors, (0), 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 17:25:07,580 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:25:07,591 INFO L225 Difference]: With dead ends: 3730 [2021-11-23 17:25:07,592 INFO L226 Difference]: Without dead ends: 2307 [2021-11-23 17:25:07,594 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 575 GetRequests, 565 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=41, Invalid=91, Unknown=0, NotChecked=0, Total=132 [2021-11-23 17:25:07,595 INFO L933 BasicCegarLoop]: 69 mSDtfsCounter, 1076 mSDsluCounter, 31 mSDsCounter, 0 mSdLazyCounter, 2587 mSolverCounterSat, 686 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 30.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1076 SdHoareTripleChecker+Valid, 100 SdHoareTripleChecker+Invalid, 3274 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 686 IncrementalHoareTripleChecker+Valid, 2587 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 32.8s IncrementalHoareTripleChecker+Time [2021-11-23 17:25:07,596 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1076 Valid, 100 Invalid, 3274 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [686 Valid, 2587 Invalid, 1 Unknown, 0 Unchecked, 32.8s Time] [2021-11-23 17:25:07,599 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2307 states. [2021-11-23 17:25:07,651 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2307 to 2307. [2021-11-23 17:25:07,656 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2307 states, 2306 states have (on average 1.0637467476149176) internal successors, (2453), 2306 states have internal predecessors, (2453), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:25:07,661 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2307 states to 2307 states and 2453 transitions. [2021-11-23 17:25:07,661 INFO L78 Accepts]: Start accepts. Automaton has 2307 states and 2453 transitions. Word has length 192 [2021-11-23 17:25:07,662 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:25:07,662 INFO L470 AbstractCegarLoop]: Abstraction has 2307 states and 2453 transitions. [2021-11-23 17:25:07,662 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 27.428571428571427) internal successors, (192), 7 states have internal predecessors, (192), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:25:07,662 INFO L276 IsEmpty]: Start isEmpty. Operand 2307 states and 2453 transitions. [2021-11-23 17:25:07,669 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 372 [2021-11-23 17:25:07,669 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:25:07,670 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:25:07,677 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (7)] Forceful destruction successful, exit code 0 [2021-11-23 17:25:07,888 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-11-23 17:25:08,072 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:25:08,072 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:25:08,072 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:25:08,073 INFO L85 PathProgramCache]: Analyzing trace with hash 1461402478, now seen corresponding path program 1 times [2021-11-23 17:25:08,074 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:25:08,075 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [181906308] [2021-11-23 17:25:08,075 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:25:08,075 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:25:08,075 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:25:08,076 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:25:08,078 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-11-23 17:25:08,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:25:08,242 INFO L263 TraceCheckSpWp]: Trace formula consists of 417 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:25:08,246 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:25:09,950 INFO L134 CoverageAnalysis]: Checked inductivity of 141 backedges. 141 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:25:09,950 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:25:09,950 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:25:09,950 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [181906308] [2021-11-23 17:25:09,951 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [181906308] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:25:09,951 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:25:09,951 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:25:09,951 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [782622904] [2021-11-23 17:25:09,951 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:25:09,952 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 17:25:09,953 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:25:09,953 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 17:25:09,953 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 17:25:09,954 INFO L87 Difference]: Start difference. First operand 2307 states and 2453 transitions. Second operand has 4 states, 4 states have (on average 92.75) internal successors, (371), 3 states have internal predecessors, (371), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:25:15,597 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:25:15,598 INFO L93 Difference]: Finished difference Result 4283 states and 4573 transitions. [2021-11-23 17:25:15,605 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 17:25:15,605 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 92.75) internal successors, (371), 3 states have internal predecessors, (371), 0 states have call successors, (0), 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 371 [2021-11-23 17:25:15,606 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:25:15,620 INFO L225 Difference]: With dead ends: 4283 [2021-11-23 17:25:15,621 INFO L226 Difference]: Without dead ends: 2307 [2021-11-23 17:25:15,624 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 370 GetRequests, 368 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 17:25:15,625 INFO L933 BasicCegarLoop]: 111 mSDtfsCounter, 303 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 1515 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 303 SdHoareTripleChecker+Valid, 123 SdHoareTripleChecker+Invalid, 1521 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 1515 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.6s IncrementalHoareTripleChecker+Time [2021-11-23 17:25:15,626 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [303 Valid, 123 Invalid, 1521 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 1515 Invalid, 0 Unknown, 0 Unchecked, 5.6s Time] [2021-11-23 17:25:15,630 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2307 states. [2021-11-23 17:25:15,686 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2307 to 2307. [2021-11-23 17:25:15,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2307 states, 2306 states have (on average 1.0607111882046834) internal successors, (2446), 2306 states have internal predecessors, (2446), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:25:15,697 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2307 states to 2307 states and 2446 transitions. [2021-11-23 17:25:15,697 INFO L78 Accepts]: Start accepts. Automaton has 2307 states and 2446 transitions. Word has length 371 [2021-11-23 17:25:15,698 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:25:15,698 INFO L470 AbstractCegarLoop]: Abstraction has 2307 states and 2446 transitions. [2021-11-23 17:25:15,699 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 92.75) internal successors, (371), 3 states have internal predecessors, (371), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:25:15,699 INFO L276 IsEmpty]: Start isEmpty. Operand 2307 states and 2446 transitions. [2021-11-23 17:25:15,710 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 476 [2021-11-23 17:25:15,710 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:25:15,711 INFO L514 BasicCegarLoop]: trace histogram [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, 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, 3, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:25:15,730 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-11-23 17:25:15,930 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:25:15,930 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:25:15,931 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:25:15,931 INFO L85 PathProgramCache]: Analyzing trace with hash -536354193, now seen corresponding path program 1 times [2021-11-23 17:25:15,934 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:25:15,934 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [782852845] [2021-11-23 17:25:15,934 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:25:15,934 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:25:15,935 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:25:15,937 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:25:15,966 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-11-23 17:25:16,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:25:16,124 INFO L263 TraceCheckSpWp]: Trace formula consists of 530 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:25:16,129 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:25:18,042 INFO L134 CoverageAnalysis]: Checked inductivity of 341 backedges. 26 proven. 315 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:25:18,042 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:25:20,077 INFO L134 CoverageAnalysis]: Checked inductivity of 341 backedges. 246 proven. 0 refuted. 0 times theorem prover too weak. 95 trivial. 0 not checked. [2021-11-23 17:25:20,077 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:25:20,077 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [782852845] [2021-11-23 17:25:20,077 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [782852845] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-23 17:25:20,078 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 17:25:20,078 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 6 [2021-11-23 17:25:20,078 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1888163493] [2021-11-23 17:25:20,078 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:25:20,079 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:25:20,079 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:25:20,079 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:25:20,079 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:25:20,080 INFO L87 Difference]: Start difference. First operand 2307 states and 2446 transitions. Second operand has 3 states, 3 states have (on average 127.0) internal successors, (381), 3 states have internal predecessors, (381), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:25:23,058 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.21s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:25:27,457 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.07s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:25:35,196 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:25:35,196 INFO L93 Difference]: Finished difference Result 4941 states and 5336 transitions. [2021-11-23 17:25:35,203 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:25:35,203 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 127.0) internal successors, (381), 3 states have internal predecessors, (381), 0 states have call successors, (0), 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 475 [2021-11-23 17:25:35,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:25:35,221 INFO L225 Difference]: With dead ends: 4941 [2021-11-23 17:25:35,221 INFO L226 Difference]: Without dead ends: 3294 [2021-11-23 17:25:35,224 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 948 GetRequests, 944 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:25:35,225 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 211 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 757 mSolverCounterSat, 177 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 14.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 211 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 934 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 177 IncrementalHoareTripleChecker+Valid, 757 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 15.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:25:35,225 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [211 Valid, 24 Invalid, 934 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [177 Valid, 757 Invalid, 0 Unknown, 0 Unchecked, 15.1s Time] [2021-11-23 17:25:35,230 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3294 states. [2021-11-23 17:25:35,285 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3294 to 3294. [2021-11-23 17:25:35,291 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3294 states, 3293 states have (on average 1.0750075918615245) internal successors, (3540), 3293 states have internal predecessors, (3540), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:25:35,299 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3294 states to 3294 states and 3540 transitions. [2021-11-23 17:25:35,299 INFO L78 Accepts]: Start accepts. Automaton has 3294 states and 3540 transitions. Word has length 475 [2021-11-23 17:25:35,300 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:25:35,300 INFO L470 AbstractCegarLoop]: Abstraction has 3294 states and 3540 transitions. [2021-11-23 17:25:35,301 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 127.0) internal successors, (381), 3 states have internal predecessors, (381), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:25:35,301 INFO L276 IsEmpty]: Start isEmpty. Operand 3294 states and 3540 transitions. [2021-11-23 17:25:35,314 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 500 [2021-11-23 17:25:35,314 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:25:35,315 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-23 17:25:35,333 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2021-11-23 17:25:35,533 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:25:35,534 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:25:35,534 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:25:35,534 INFO L85 PathProgramCache]: Analyzing trace with hash 238645766, now seen corresponding path program 1 times [2021-11-23 17:25:35,536 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:25:35,536 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [488960671] [2021-11-23 17:25:35,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:25:35,537 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:25:35,537 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:25:35,538 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:25:35,539 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-11-23 17:25:35,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:25:35,704 INFO L263 TraceCheckSpWp]: Trace formula consists of 544 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:25:35,711 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:25:38,756 INFO L134 CoverageAnalysis]: Checked inductivity of 259 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 242 trivial. 0 not checked. [2021-11-23 17:25:38,756 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:25:38,756 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:25:38,757 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [488960671] [2021-11-23 17:25:38,757 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [488960671] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:25:38,757 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:25:38,757 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 17:25:38,757 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [291656476] [2021-11-23 17:25:38,757 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:25:38,758 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:25:38,758 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:25:38,758 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:25:38,758 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:25:38,759 INFO L87 Difference]: Start difference. First operand 3294 states and 3540 transitions. Second operand has 3 states, 3 states have (on average 86.0) internal successors, (258), 2 states have internal predecessors, (258), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:25:42,343 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:25:42,343 INFO L93 Difference]: Finished difference Result 5928 states and 6416 transitions. [2021-11-23 17:25:42,344 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:25:42,344 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 86.0) internal successors, (258), 2 states have internal predecessors, (258), 0 states have call successors, (0), 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 499 [2021-11-23 17:25:42,345 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:25:42,361 INFO L225 Difference]: With dead ends: 5928 [2021-11-23 17:25:42,361 INFO L226 Difference]: Without dead ends: 3294 [2021-11-23 17:25:42,364 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 498 GetRequests, 497 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 17:25:42,365 INFO L933 BasicCegarLoop]: 109 mSDtfsCounter, 85 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 758 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 85 SdHoareTripleChecker+Valid, 114 SdHoareTripleChecker+Invalid, 759 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 758 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.5s IncrementalHoareTripleChecker+Time [2021-11-23 17:25:42,366 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [85 Valid, 114 Invalid, 759 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 758 Invalid, 0 Unknown, 0 Unchecked, 3.5s Time] [2021-11-23 17:25:42,370 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3294 states. [2021-11-23 17:25:42,419 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3294 to 3294. [2021-11-23 17:25:42,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3294 states, 3293 states have (on average 1.0747039174005466) internal successors, (3539), 3293 states have internal predecessors, (3539), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:25:42,432 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3294 states to 3294 states and 3539 transitions. [2021-11-23 17:25:42,432 INFO L78 Accepts]: Start accepts. Automaton has 3294 states and 3539 transitions. Word has length 499 [2021-11-23 17:25:42,433 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:25:42,433 INFO L470 AbstractCegarLoop]: Abstraction has 3294 states and 3539 transitions. [2021-11-23 17:25:42,434 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 86.0) internal successors, (258), 2 states have internal predecessors, (258), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:25:42,434 INFO L276 IsEmpty]: Start isEmpty. Operand 3294 states and 3539 transitions. [2021-11-23 17:25:42,447 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 510 [2021-11-23 17:25:42,447 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:25:42,448 INFO L514 BasicCegarLoop]: trace histogram [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, 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, 3, 3, 3, 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, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:25:42,472 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2021-11-23 17:25:42,663 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:25:42,664 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:25:42,664 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:25:42,664 INFO L85 PathProgramCache]: Analyzing trace with hash 1212935140, now seen corresponding path program 1 times [2021-11-23 17:25:42,666 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:25:42,666 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1202329835] [2021-11-23 17:25:42,666 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:25:42,666 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:25:42,667 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:25:42,667 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:25:42,668 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2021-11-23 17:25:42,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:25:42,801 INFO L263 TraceCheckSpWp]: Trace formula consists of 565 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:25:42,809 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:25:46,149 INFO L134 CoverageAnalysis]: Checked inductivity of 375 backedges. 0 proven. 375 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:25:46,149 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:25:49,407 INFO L134 CoverageAnalysis]: Checked inductivity of 375 backedges. 214 proven. 66 refuted. 0 times theorem prover too weak. 95 trivial. 0 not checked. [2021-11-23 17:25:49,407 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:25:49,408 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1202329835] [2021-11-23 17:25:49,408 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1202329835] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:25:49,408 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [456449703] [2021-11-23 17:25:49,408 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:25:49,408 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:25:49,408 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:25:49,409 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:25:49,410 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (12)] Waiting until timeout for monitored process [2021-11-23 17:25:49,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:25:49,636 INFO L263 TraceCheckSpWp]: Trace formula consists of 565 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:25:49,641 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:25:50,509 INFO L134 CoverageAnalysis]: Checked inductivity of 375 backedges. 280 proven. 0 refuted. 0 times theorem prover too weak. 95 trivial. 0 not checked. [2021-11-23 17:25:50,509 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:25:50,509 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [456449703] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:25:50,509 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:25:50,510 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6, 5] total 10 [2021-11-23 17:25:50,510 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1687174314] [2021-11-23 17:25:50,510 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:25:50,511 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:25:50,511 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:25:50,511 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:25:50,512 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2021-11-23 17:25:50,512 INFO L87 Difference]: Start difference. First operand 3294 states and 3539 transitions. Second operand has 3 states, 3 states have (on average 138.33333333333334) internal successors, (415), 3 states have internal predecessors, (415), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:25:55,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:25:55,336 INFO L93 Difference]: Finished difference Result 6915 states and 7508 transitions. [2021-11-23 17:25:55,336 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:25:55,337 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 138.33333333333334) internal successors, (415), 3 states have internal predecessors, (415), 0 states have call successors, (0), 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 509 [2021-11-23 17:25:55,337 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:25:55,351 INFO L225 Difference]: With dead ends: 6915 [2021-11-23 17:25:55,352 INFO L226 Difference]: Without dead ends: 4281 [2021-11-23 17:25:55,355 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1524 GetRequests, 1516 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2021-11-23 17:25:55,355 INFO L933 BasicCegarLoop]: 427 mSDtfsCounter, 171 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 762 mSolverCounterSat, 88 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 171 SdHoareTripleChecker+Valid, 433 SdHoareTripleChecker+Invalid, 850 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 88 IncrementalHoareTripleChecker+Valid, 762 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.8s IncrementalHoareTripleChecker+Time [2021-11-23 17:25:55,356 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [171 Valid, 433 Invalid, 850 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [88 Valid, 762 Invalid, 0 Unknown, 0 Unchecked, 4.8s Time] [2021-11-23 17:25:55,361 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4281 states. [2021-11-23 17:25:55,419 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4281 to 4281. [2021-11-23 17:25:55,427 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4281 states, 4280 states have (on average 1.0623831775700934) internal successors, (4547), 4280 states have internal predecessors, (4547), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:25:55,436 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4281 states to 4281 states and 4547 transitions. [2021-11-23 17:25:55,437 INFO L78 Accepts]: Start accepts. Automaton has 4281 states and 4547 transitions. Word has length 509 [2021-11-23 17:25:55,438 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:25:55,438 INFO L470 AbstractCegarLoop]: Abstraction has 4281 states and 4547 transitions. [2021-11-23 17:25:55,438 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 138.33333333333334) internal successors, (415), 3 states have internal predecessors, (415), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:25:55,439 INFO L276 IsEmpty]: Start isEmpty. Operand 4281 states and 4547 transitions. [2021-11-23 17:25:55,445 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 625 [2021-11-23 17:25:55,446 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:25:55,446 INFO L514 BasicCegarLoop]: trace histogram [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, 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, 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, 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, 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, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:25:55,462 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (11)] Forceful destruction successful, exit code 0 [2021-11-23 17:25:55,662 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (12)] Ended with exit code 0 [2021-11-23 17:25:55,861 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:25:55,862 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:25:55,862 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:25:55,863 INFO L85 PathProgramCache]: Analyzing trace with hash -1166616721, now seen corresponding path program 1 times [2021-11-23 17:25:55,867 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:25:55,867 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1561095317] [2021-11-23 17:25:55,867 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:25:55,867 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:25:55,867 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:25:55,868 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:25:55,869 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2021-11-23 17:25:56,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:25:56,071 INFO L263 TraceCheckSpWp]: Trace formula consists of 680 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 17:25:56,078 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:25:58,422 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 343 refuted. 0 times theorem prover too weak. 218 trivial. 0 not checked. [2021-11-23 17:25:58,422 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:26:13,313 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 343 refuted. 0 times theorem prover too weak. 218 trivial. 0 not checked. [2021-11-23 17:26:13,313 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:26:13,313 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1561095317] [2021-11-23 17:26:13,313 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1561095317] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:26:13,313 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [437170079] [2021-11-23 17:26:13,314 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:26:13,314 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:26:13,314 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:26:13,314 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:26:13,316 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (14)] Waiting until timeout for monitored process [2021-11-23 17:26:13,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:26:13,614 INFO L263 TraceCheckSpWp]: Trace formula consists of 680 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:26:13,622 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:26:14,331 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 26 proven. 0 refuted. 0 times theorem prover too weak. 535 trivial. 0 not checked. [2021-11-23 17:26:14,331 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:26:14,331 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [437170079] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:26:14,331 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:26:14,332 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5, 5] total 9 [2021-11-23 17:26:14,332 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [385313528] [2021-11-23 17:26:14,332 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:26:14,333 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:26:14,333 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:26:14,333 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:26:14,333 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-11-23 17:26:14,333 INFO L87 Difference]: Start difference. First operand 4281 states and 4547 transitions. Second operand has 3 states, 3 states have (on average 83.0) internal successors, (249), 3 states have internal predecessors, (249), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:26:18,940 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:26:18,940 INFO L93 Difference]: Finished difference Result 8889 states and 9524 transitions. [2021-11-23 17:26:18,941 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:26:18,941 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 83.0) internal successors, (249), 3 states have internal predecessors, (249), 0 states have call successors, (0), 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 624 [2021-11-23 17:26:18,954 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:26:18,974 INFO L225 Difference]: With dead ends: 8889 [2021-11-23 17:26:18,974 INFO L226 Difference]: Without dead ends: 5268 [2021-11-23 17:26:18,977 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1869 GetRequests, 1862 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-11-23 17:26:18,978 INFO L933 BasicCegarLoop]: 416 mSDtfsCounter, 326 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 770 mSolverCounterSat, 81 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 326 SdHoareTripleChecker+Valid, 422 SdHoareTripleChecker+Invalid, 851 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 81 IncrementalHoareTripleChecker+Valid, 770 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.6s IncrementalHoareTripleChecker+Time [2021-11-23 17:26:18,978 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [326 Valid, 422 Invalid, 851 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [81 Valid, 770 Invalid, 0 Unknown, 0 Unchecked, 4.6s Time] [2021-11-23 17:26:18,984 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5268 states. [2021-11-23 17:26:19,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5268 to 5268. [2021-11-23 17:26:19,061 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5268 states, 5267 states have (on average 1.0571482817543194) internal successors, (5568), 5267 states have internal predecessors, (5568), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:26:19,068 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5268 states to 5268 states and 5568 transitions. [2021-11-23 17:26:19,068 INFO L78 Accepts]: Start accepts. Automaton has 5268 states and 5568 transitions. Word has length 624 [2021-11-23 17:26:19,070 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:26:19,070 INFO L470 AbstractCegarLoop]: Abstraction has 5268 states and 5568 transitions. [2021-11-23 17:26:19,070 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 83.0) internal successors, (249), 3 states have internal predecessors, (249), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:26:19,070 INFO L276 IsEmpty]: Start isEmpty. Operand 5268 states and 5568 transitions. [2021-11-23 17:26:19,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 656 [2021-11-23 17:26:19,078 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:26:19,079 INFO L514 BasicCegarLoop]: trace histogram [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, 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, 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, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:26:19,102 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (13)] Forceful destruction successful, exit code 0 [2021-11-23 17:26:19,292 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (14)] Forceful destruction successful, exit code 0 [2021-11-23 17:26:19,491 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:26:19,491 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:26:19,492 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:26:19,492 INFO L85 PathProgramCache]: Analyzing trace with hash -436390077, now seen corresponding path program 1 times [2021-11-23 17:26:19,494 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:26:19,494 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [852704390] [2021-11-23 17:26:19,494 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:26:19,495 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:26:19,495 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:26:19,496 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:26:19,499 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2021-11-23 17:26:19,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:26:19,706 INFO L263 TraceCheckSpWp]: Trace formula consists of 718 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:26:19,712 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:26:21,507 INFO L134 CoverageAnalysis]: Checked inductivity of 696 backedges. 220 proven. 249 refuted. 0 times theorem prover too weak. 227 trivial. 0 not checked. [2021-11-23 17:26:21,508 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:26:39,166 INFO L134 CoverageAnalysis]: Checked inductivity of 696 backedges. 220 proven. 249 refuted. 0 times theorem prover too weak. 227 trivial. 0 not checked. [2021-11-23 17:26:39,166 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:26:39,167 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [852704390] [2021-11-23 17:26:39,167 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [852704390] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:26:39,167 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [911896943] [2021-11-23 17:26:39,167 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:26:39,167 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:26:39,168 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:26:39,177 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:26:39,178 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (16)] Waiting until timeout for monitored process [2021-11-23 17:26:39,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:26:39,506 INFO L263 TraceCheckSpWp]: Trace formula consists of 718 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 17:26:39,512 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:26:41,753 INFO L134 CoverageAnalysis]: Checked inductivity of 696 backedges. 220 proven. 9 refuted. 0 times theorem prover too weak. 467 trivial. 0 not checked. [2021-11-23 17:26:41,753 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:26:43,639 INFO L134 CoverageAnalysis]: Checked inductivity of 696 backedges. 220 proven. 9 refuted. 0 times theorem prover too weak. 467 trivial. 0 not checked. [2021-11-23 17:26:43,639 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [911896943] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:26:43,639 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [720917198] [2021-11-23 17:26:43,639 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:26:43,640 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:26:43,640 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:26:43,659 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:26:43,665 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-23 17:26:43,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:26:43,843 INFO L263 TraceCheckSpWp]: Trace formula consists of 718 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 17:26:43,848 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:26:46,614 INFO L134 CoverageAnalysis]: Checked inductivity of 696 backedges. 191 proven. 38 refuted. 0 times theorem prover too weak. 467 trivial. 0 not checked. [2021-11-23 17:26:46,614 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:26:49,619 INFO L134 CoverageAnalysis]: Checked inductivity of 696 backedges. 29 proven. 200 refuted. 0 times theorem prover too weak. 467 trivial. 0 not checked. [2021-11-23 17:26:49,620 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [720917198] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:26:49,620 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:26:49,621 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 8, 8, 7, 7] total 23 [2021-11-23 17:26:49,621 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [316634057] [2021-11-23 17:26:49,621 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:26:49,624 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-23 17:26:49,625 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:26:49,625 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-23 17:26:49,625 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=386, Unknown=0, NotChecked=0, Total=506 [2021-11-23 17:26:49,627 INFO L87 Difference]: Start difference. First operand 5268 states and 5568 transitions. Second operand has 23 states, 23 states have (on average 66.08695652173913) internal successors, (1520), 23 states have internal predecessors, (1520), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:27:42,933 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.92s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:28:12,968 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.40s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:28:25,276 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.23s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:28:27,005 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.53s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:28:30,087 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.09s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:28:31,515 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.43s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:29:01,549 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.03s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:29:13,217 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:29:18,677 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.64s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:29:22,632 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.17s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:30:17,778 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:30:26,674 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.10s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:30:48,089 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.33s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:31:04,191 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:31:04,191 INFO L93 Difference]: Finished difference Result 20863 states and 22634 transitions. [2021-11-23 17:31:04,198 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-11-23 17:31:04,199 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 66.08695652173913) internal successors, (1520), 23 states have internal predecessors, (1520), 0 states have call successors, (0), 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 655 [2021-11-23 17:31:04,200 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:31:04,262 INFO L225 Difference]: With dead ends: 20863 [2021-11-23 17:31:04,262 INFO L226 Difference]: Without dead ends: 13952 [2021-11-23 17:31:04,276 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3969 GetRequests, 3924 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 597 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=516, Invalid=1646, Unknown=0, NotChecked=0, Total=2162 [2021-11-23 17:31:04,276 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 23352 mSDsluCounter, 128 mSDsCounter, 0 mSdLazyCounter, 10088 mSolverCounterSat, 3045 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 231.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23352 SdHoareTripleChecker+Valid, 144 SdHoareTripleChecker+Invalid, 13135 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 3045 IncrementalHoareTripleChecker+Valid, 10088 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 249.3s IncrementalHoareTripleChecker+Time [2021-11-23 17:31:04,277 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [23352 Valid, 144 Invalid, 13135 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [3045 Valid, 10088 Invalid, 2 Unknown, 0 Unchecked, 249.3s Time] [2021-11-23 17:31:04,291 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13952 states. [2021-11-23 17:31:04,517 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13952 to 10861. [2021-11-23 17:31:04,538 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10861 states, 10860 states have (on average 1.0669429097605894) internal successors, (11587), 10860 states have internal predecessors, (11587), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:31:04,612 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10861 states to 10861 states and 11587 transitions. [2021-11-23 17:31:04,635 INFO L78 Accepts]: Start accepts. Automaton has 10861 states and 11587 transitions. Word has length 655 [2021-11-23 17:31:04,636 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:31:04,637 INFO L470 AbstractCegarLoop]: Abstraction has 10861 states and 11587 transitions. [2021-11-23 17:31:04,638 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 66.08695652173913) internal successors, (1520), 23 states have internal predecessors, (1520), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:31:04,649 INFO L276 IsEmpty]: Start isEmpty. Operand 10861 states and 11587 transitions. [2021-11-23 17:31:04,677 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1269 [2021-11-23 17:31:04,677 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:31:04,678 INFO L514 BasicCegarLoop]: trace histogram [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, 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, 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, 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, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-23 17:31:04,695 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (15)] Ended with exit code 0 [2021-11-23 17:31:04,914 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-23 17:31:05,097 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (16)] Forceful destruction successful, exit code 0 [2021-11-23 17:31:05,292 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:31:05,292 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:31:05,292 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:31:05,292 INFO L85 PathProgramCache]: Analyzing trace with hash -1751965123, now seen corresponding path program 1 times [2021-11-23 17:31:05,297 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:31:05,297 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1076975137] [2021-11-23 17:31:05,297 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:05,297 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:31:05,298 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:31:05,299 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:31:05,301 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (18)] Waiting until timeout for monitored process [2021-11-23 17:31:05,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:05,853 INFO L263 TraceCheckSpWp]: Trace formula consists of 1374 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:31:05,892 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:08,854 INFO L134 CoverageAnalysis]: Checked inductivity of 3547 backedges. 1907 proven. 405 refuted. 0 times theorem prover too weak. 1235 trivial. 0 not checked. [2021-11-23 17:31:08,855 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:31:11,664 INFO L134 CoverageAnalysis]: Checked inductivity of 3547 backedges. 2217 proven. 0 refuted. 0 times theorem prover too weak. 1330 trivial. 0 not checked. [2021-11-23 17:31:11,664 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:31:11,664 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1076975137] [2021-11-23 17:31:11,664 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1076975137] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-23 17:31:11,664 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 17:31:11,665 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 6 [2021-11-23 17:31:11,665 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2018860703] [2021-11-23 17:31:11,665 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:31:11,666 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:31:11,666 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:31:11,667 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:31:11,667 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:31:11,667 INFO L87 Difference]: Start difference. First operand 10861 states and 11587 transitions. Second operand has 3 states, 3 states have (on average 217.0) internal successors, (651), 3 states have internal predecessors, (651), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:31:15,053 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.56s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:31:18,760 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:31:21,857 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.52s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:31:24,600 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.62s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:31:28,635 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.80s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:31:31,563 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.93s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:31:39,506 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:31:39,506 INFO L93 Difference]: Finished difference Result 25339 states and 27079 transitions. [2021-11-23 17:31:39,511 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:31:39,511 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 217.0) internal successors, (651), 3 states have internal predecessors, (651), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 1268 [2021-11-23 17:31:39,526 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:31:39,564 INFO L225 Difference]: With dead ends: 25339 [2021-11-23 17:31:39,564 INFO L226 Difference]: Without dead ends: 15467 [2021-11-23 17:31:39,574 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2534 GetRequests, 2530 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:31:39,575 INFO L933 BasicCegarLoop]: 40 mSDtfsCounter, 120 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 786 mSolverCounterSat, 86 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 26.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 120 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 873 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 86 IncrementalHoareTripleChecker+Valid, 786 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 27.7s IncrementalHoareTripleChecker+Time [2021-11-23 17:31:39,575 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [120 Valid, 45 Invalid, 873 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [86 Valid, 786 Invalid, 1 Unknown, 0 Unchecked, 27.7s Time] [2021-11-23 17:31:39,597 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15467 states. [2021-11-23 17:31:39,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15467 to 14480. [2021-11-23 17:31:39,857 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14480 states, 14479 states have (on average 1.0591201049796257) internal successors, (15335), 14479 states have internal predecessors, (15335), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:31:39,881 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14480 states to 14480 states and 15335 transitions. [2021-11-23 17:31:39,881 INFO L78 Accepts]: Start accepts. Automaton has 14480 states and 15335 transitions. Word has length 1268 [2021-11-23 17:31:39,882 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:31:39,883 INFO L470 AbstractCegarLoop]: Abstraction has 14480 states and 15335 transitions. [2021-11-23 17:31:39,883 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 217.0) internal successors, (651), 3 states have internal predecessors, (651), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:31:39,883 INFO L276 IsEmpty]: Start isEmpty. Operand 14480 states and 15335 transitions. [2021-11-23 17:31:40,011 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1524 [2021-11-23 17:31:40,022 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:31:40,023 INFO L514 BasicCegarLoop]: trace histogram [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, 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, 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, 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, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:31:40,050 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (18)] Forceful destruction successful, exit code 0 [2021-11-23 17:31:40,224 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:31:40,224 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:31:40,224 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:31:40,225 INFO L85 PathProgramCache]: Analyzing trace with hash 1349178288, now seen corresponding path program 1 times [2021-11-23 17:31:40,233 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:31:40,234 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [9770260] [2021-11-23 17:31:40,234 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:40,234 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:31:40,235 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:31:40,236 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:31:40,243 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (19)] Waiting until timeout for monitored process [2021-11-23 17:31:40,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:41,006 INFO L263 TraceCheckSpWp]: Trace formula consists of 1645 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 17:31:41,016 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:44,612 INFO L134 CoverageAnalysis]: Checked inductivity of 5551 backedges. 3050 proven. 1656 refuted. 0 times theorem prover too weak. 845 trivial. 0 not checked. [2021-11-23 17:31:44,613 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:32:05,742 INFO L134 CoverageAnalysis]: Checked inductivity of 5551 backedges. 3934 proven. 79 refuted. 0 times theorem prover too weak. 1538 trivial. 0 not checked. [2021-11-23 17:32:05,743 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:32:05,743 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [9770260] [2021-11-23 17:32:05,743 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [9770260] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:32:05,743 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2020407930] [2021-11-23 17:32:05,743 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:32:05,743 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:32:05,743 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:32:05,745 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:32:05,749 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (20)] Waiting until timeout for monitored process [2021-11-23 17:32:06,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:32:06,401 INFO L263 TraceCheckSpWp]: Trace formula consists of 1645 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:32:06,409 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:32:08,697 INFO L134 CoverageAnalysis]: Checked inductivity of 5551 backedges. 2357 proven. 0 refuted. 0 times theorem prover too weak. 3194 trivial. 0 not checked. [2021-11-23 17:32:08,697 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:32:08,697 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2020407930] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:32:08,698 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:32:08,699 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [7, 4] total 11 [2021-11-23 17:32:08,700 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [799867324] [2021-11-23 17:32:08,713 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:32:08,715 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:32:08,715 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:32:08,716 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:32:08,716 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-11-23 17:32:08,717 INFO L87 Difference]: Start difference. First operand 14480 states and 15335 transitions. Second operand has 3 states, 3 states have (on average 194.66666666666666) internal successors, (584), 3 states have internal predecessors, (584), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:32:14,279 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:32:14,279 INFO L93 Difference]: Finished difference Result 28958 states and 30744 transitions. [2021-11-23 17:32:14,280 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:32:14,280 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 194.66666666666666) internal successors, (584), 3 states have internal predecessors, (584), 0 states have call successors, (0), 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 1523 [2021-11-23 17:32:14,282 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:32:14,309 INFO L225 Difference]: With dead ends: 28958 [2021-11-23 17:32:14,309 INFO L226 Difference]: Without dead ends: 15467 [2021-11-23 17:32:14,319 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4566 GetRequests, 4557 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-11-23 17:32:14,320 INFO L933 BasicCegarLoop]: 78 mSDtfsCounter, 180 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 758 mSolverCounterSat, 79 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 180 SdHoareTripleChecker+Valid, 83 SdHoareTripleChecker+Invalid, 837 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 79 IncrementalHoareTripleChecker+Valid, 758 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.4s IncrementalHoareTripleChecker+Time [2021-11-23 17:32:14,320 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [180 Valid, 83 Invalid, 837 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [79 Valid, 758 Invalid, 0 Unknown, 0 Unchecked, 5.4s Time] [2021-11-23 17:32:14,335 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15467 states. [2021-11-23 17:32:14,593 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15467 to 15138. [2021-11-23 17:32:14,609 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15138 states, 15137 states have (on average 1.0549646561405828) internal successors, (15969), 15137 states have internal predecessors, (15969), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:32:14,630 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15138 states to 15138 states and 15969 transitions. [2021-11-23 17:32:14,631 INFO L78 Accepts]: Start accepts. Automaton has 15138 states and 15969 transitions. Word has length 1523 [2021-11-23 17:32:14,632 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:32:14,632 INFO L470 AbstractCegarLoop]: Abstraction has 15138 states and 15969 transitions. [2021-11-23 17:32:14,632 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 194.66666666666666) internal successors, (584), 3 states have internal predecessors, (584), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:32:14,633 INFO L276 IsEmpty]: Start isEmpty. Operand 15138 states and 15969 transitions. [2021-11-23 17:32:14,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1564 [2021-11-23 17:32:14,726 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:32:14,728 INFO L514 BasicCegarLoop]: trace histogram [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, 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, 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, 5, 5, 5, 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, 3, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:32:14,753 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (19)] Forceful destruction successful, exit code 0 [2021-11-23 17:32:14,951 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (20)] Forceful destruction successful, exit code 0 [2021-11-23 17:32:15,146 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:32:15,146 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:32:15,147 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:32:15,147 INFO L85 PathProgramCache]: Analyzing trace with hash -996388875, now seen corresponding path program 1 times [2021-11-23 17:32:15,152 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:32:15,153 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [151332780] [2021-11-23 17:32:15,153 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:32:15,153 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:32:15,153 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:32:15,154 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:32:15,155 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (21)] Waiting until timeout for monitored process [2021-11-23 17:32:15,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:32:15,784 INFO L263 TraceCheckSpWp]: Trace formula consists of 1669 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:32:15,792 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:32:19,088 INFO L134 CoverageAnalysis]: Checked inductivity of 4288 backedges. 2837 proven. 0 refuted. 0 times theorem prover too weak. 1451 trivial. 0 not checked. [2021-11-23 17:32:19,089 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:32:19,089 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:32:19,089 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [151332780] [2021-11-23 17:32:19,089 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [151332780] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:32:19,089 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:32:19,090 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:32:19,090 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1585530528] [2021-11-23 17:32:19,090 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:32:19,092 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:32:19,092 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:32:19,092 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:32:19,093 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:32:19,093 INFO L87 Difference]: Start difference. First operand 15138 states and 15969 transitions. Second operand has 3 states, 3 states have (on average 273.3333333333333) internal successors, (820), 3 states have internal predecessors, (820), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:32:22,950 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:32:22,951 INFO L93 Difference]: Finished difference Result 29287 states and 30944 transitions. [2021-11-23 17:32:22,951 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:32:22,951 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 273.3333333333333) internal successors, (820), 3 states have internal predecessors, (820), 0 states have call successors, (0), 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 1563 [2021-11-23 17:32:22,953 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:32:22,976 INFO L225 Difference]: With dead ends: 29287 [2021-11-23 17:32:22,976 INFO L226 Difference]: Without dead ends: 15138 [2021-11-23 17:32:22,988 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1562 GetRequests, 1561 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 17:32:22,989 INFO L933 BasicCegarLoop]: 428 mSDtfsCounter, 62 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 746 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 62 SdHoareTripleChecker+Valid, 434 SdHoareTripleChecker+Invalid, 753 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 746 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.8s IncrementalHoareTripleChecker+Time [2021-11-23 17:32:22,989 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [62 Valid, 434 Invalid, 753 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 746 Invalid, 0 Unknown, 0 Unchecked, 3.8s Time] [2021-11-23 17:32:23,004 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15138 states. [2021-11-23 17:32:23,195 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15138 to 15138. [2021-11-23 17:32:23,206 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15138 states, 15137 states have (on average 1.0548325295633216) internal successors, (15967), 15137 states have internal predecessors, (15967), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:32:23,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15138 states to 15138 states and 15967 transitions. [2021-11-23 17:32:23,227 INFO L78 Accepts]: Start accepts. Automaton has 15138 states and 15967 transitions. Word has length 1563 [2021-11-23 17:32:23,228 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:32:23,228 INFO L470 AbstractCegarLoop]: Abstraction has 15138 states and 15967 transitions. [2021-11-23 17:32:23,229 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 273.3333333333333) internal successors, (820), 3 states have internal predecessors, (820), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:32:23,229 INFO L276 IsEmpty]: Start isEmpty. Operand 15138 states and 15967 transitions. [2021-11-23 17:32:23,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1717 [2021-11-23 17:32:23,340 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:32:23,342 INFO L514 BasicCegarLoop]: trace histogram [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, 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, 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, 6, 6, 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, 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, 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, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:32:23,363 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (21)] Forceful destruction successful, exit code 0 [2021-11-23 17:32:23,543 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:32:23,543 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:32:23,544 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:32:23,544 INFO L85 PathProgramCache]: Analyzing trace with hash 465700366, now seen corresponding path program 1 times [2021-11-23 17:32:23,550 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:32:23,550 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1375038570] [2021-11-23 17:32:23,550 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:32:23,550 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:32:23,551 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:32:23,552 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:32:23,553 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (22)] Waiting until timeout for monitored process [2021-11-23 17:32:24,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:32:24,120 INFO L263 TraceCheckSpWp]: Trace formula consists of 1840 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:32:24,133 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:32:26,668 INFO L134 CoverageAnalysis]: Checked inductivity of 5745 backedges. 3728 proven. 0 refuted. 0 times theorem prover too weak. 2017 trivial. 0 not checked. [2021-11-23 17:32:26,668 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:32:26,668 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:32:26,668 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1375038570] [2021-11-23 17:32:26,669 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1375038570] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:32:26,669 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:32:26,669 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:32:26,670 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [755214695] [2021-11-23 17:32:26,670 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:32:26,671 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:32:26,671 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:32:26,672 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:32:26,672 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:32:26,672 INFO L87 Difference]: Start difference. First operand 15138 states and 15967 transitions. Second operand has 3 states, 3 states have (on average 231.0) internal successors, (693), 3 states have internal predecessors, (693), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:32:31,850 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:32:31,851 INFO L93 Difference]: Finished difference Result 30932 states and 32712 transitions. [2021-11-23 17:32:31,854 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:32:31,854 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 231.0) internal successors, (693), 3 states have internal predecessors, (693), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 1716 [2021-11-23 17:32:31,855 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:32:31,874 INFO L225 Difference]: With dead ends: 30932 [2021-11-23 17:32:31,875 INFO L226 Difference]: Without dead ends: 16783 [2021-11-23 17:32:31,883 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1715 GetRequests, 1714 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 17:32:31,884 INFO L933 BasicCegarLoop]: 416 mSDtfsCounter, 195 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 762 mSolverCounterSat, 79 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 195 SdHoareTripleChecker+Valid, 421 SdHoareTripleChecker+Invalid, 841 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 79 IncrementalHoareTripleChecker+Valid, 762 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:32:31,884 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [195 Valid, 421 Invalid, 841 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [79 Valid, 762 Invalid, 0 Unknown, 0 Unchecked, 5.1s Time] [2021-11-23 17:32:31,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16783 states. [2021-11-23 17:32:32,122 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16783 to 16454. [2021-11-23 17:32:32,134 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16454 states, 16453 states have (on average 1.0430924451467818) internal successors, (17162), 16453 states have internal predecessors, (17162), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:32:32,155 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16454 states to 16454 states and 17162 transitions. [2021-11-23 17:32:32,155 INFO L78 Accepts]: Start accepts. Automaton has 16454 states and 17162 transitions. Word has length 1716 [2021-11-23 17:32:32,156 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:32:32,157 INFO L470 AbstractCegarLoop]: Abstraction has 16454 states and 17162 transitions. [2021-11-23 17:32:32,157 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 231.0) internal successors, (693), 3 states have internal predecessors, (693), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:32:32,157 INFO L276 IsEmpty]: Start isEmpty. Operand 16454 states and 17162 transitions. [2021-11-23 17:32:32,199 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1742 [2021-11-23 17:32:32,199 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:32:32,200 INFO L514 BasicCegarLoop]: trace histogram [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, 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, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 6, 6, 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, 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, 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, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:32:32,222 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (22)] Forceful destruction successful, exit code 0 [2021-11-23 17:32:32,418 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:32:32,419 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:32:32,419 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:32:32,420 INFO L85 PathProgramCache]: Analyzing trace with hash -18627230, now seen corresponding path program 1 times [2021-11-23 17:32:32,425 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:32:32,426 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [566788679] [2021-11-23 17:32:32,426 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:32:32,426 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:32:32,426 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:32:32,427 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:32:32,428 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (23)] Waiting until timeout for monitored process [2021-11-23 17:32:32,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:32:33,001 INFO L263 TraceCheckSpWp]: Trace formula consists of 1863 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 17:32:33,011 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:32:37,012 INFO L134 CoverageAnalysis]: Checked inductivity of 5970 backedges. 3286 proven. 1056 refuted. 0 times theorem prover too weak. 1628 trivial. 0 not checked. [2021-11-23 17:32:37,012 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:32:40,941 INFO L134 CoverageAnalysis]: Checked inductivity of 5970 backedges. 3649 proven. 0 refuted. 0 times theorem prover too weak. 2321 trivial. 0 not checked. [2021-11-23 17:32:40,941 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:32:40,941 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [566788679] [2021-11-23 17:32:40,941 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [566788679] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-23 17:32:40,941 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 17:32:40,942 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 8 [2021-11-23 17:32:40,942 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1314413806] [2021-11-23 17:32:40,942 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:32:40,943 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:32:40,943 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:32:40,944 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:32:40,944 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-11-23 17:32:40,944 INFO L87 Difference]: Start difference. First operand 16454 states and 17162 transitions. Second operand has 3 states, 3 states have (on average 214.66666666666666) internal successors, (644), 3 states have internal predecessors, (644), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:32:44,577 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.05s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:32:53,283 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:32:53,284 INFO L93 Difference]: Finished difference Result 33893 states and 35479 transitions. [2021-11-23 17:32:53,284 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:32:53,284 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 214.66666666666666) internal successors, (644), 3 states have internal predecessors, (644), 0 states have call successors, (0), 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 1741 [2021-11-23 17:32:53,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:32:53,329 INFO L225 Difference]: With dead ends: 33893 [2021-11-23 17:32:53,329 INFO L226 Difference]: Without dead ends: 18428 [2021-11-23 17:32:53,334 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3480 GetRequests, 3474 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-11-23 17:32:53,334 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 245 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 757 mSolverCounterSat, 139 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 11.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 245 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 896 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 139 IncrementalHoareTripleChecker+Valid, 757 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 12.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:32:53,334 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [245 Valid, 29 Invalid, 896 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [139 Valid, 757 Invalid, 0 Unknown, 0 Unchecked, 12.2s Time] [2021-11-23 17:32:53,351 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18428 states. [2021-11-23 17:32:53,535 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18428 to 18428. [2021-11-23 17:32:53,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18428 states, 18427 states have (on average 1.045802355239594) internal successors, (19271), 18427 states have internal predecessors, (19271), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:32:53,573 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18428 states to 18428 states and 19271 transitions. [2021-11-23 17:32:53,573 INFO L78 Accepts]: Start accepts. Automaton has 18428 states and 19271 transitions. Word has length 1741 [2021-11-23 17:32:53,574 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:32:53,575 INFO L470 AbstractCegarLoop]: Abstraction has 18428 states and 19271 transitions. [2021-11-23 17:32:53,575 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 214.66666666666666) internal successors, (644), 3 states have internal predecessors, (644), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:32:53,575 INFO L276 IsEmpty]: Start isEmpty. Operand 18428 states and 19271 transitions. [2021-11-23 17:32:53,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1789 [2021-11-23 17:32:53,658 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:32:53,659 INFO L514 BasicCegarLoop]: trace histogram [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, 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, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 8, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 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, 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, 2, 2, 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 17:32:53,672 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (23)] Ended with exit code 0 [2021-11-23 17:32:53,859 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:32:53,860 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:32:53,861 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:32:53,861 INFO L85 PathProgramCache]: Analyzing trace with hash 505322684, now seen corresponding path program 1 times [2021-11-23 17:32:53,867 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:32:53,868 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [977454311] [2021-11-23 17:32:53,868 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:32:53,868 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:32:53,868 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:32:53,869 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:32:53,870 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (24)] Waiting until timeout for monitored process [2021-11-23 17:32:54,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:32:54,394 INFO L263 TraceCheckSpWp]: Trace formula consists of 1904 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-23 17:32:54,442 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:33:01,445 INFO L134 CoverageAnalysis]: Checked inductivity of 5899 backedges. 2596 proven. 3114 refuted. 0 times theorem prover too weak. 189 trivial. 0 not checked. [2021-11-23 17:33:01,445 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:33:08,542 INFO L134 CoverageAnalysis]: Checked inductivity of 5899 backedges. 4329 proven. 416 refuted. 0 times theorem prover too weak. 1154 trivial. 0 not checked. [2021-11-23 17:33:08,542 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:33:08,542 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [977454311] [2021-11-23 17:33:08,542 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [977454311] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:33:08,542 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1927443855] [2021-11-23 17:33:08,542 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:33:08,543 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:33:08,543 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:33:08,543 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:33:08,544 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (25)] Waiting until timeout for monitored process [2021-11-23 17:33:09,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:33:09,283 INFO L263 TraceCheckSpWp]: Trace formula consists of 1904 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 17:33:09,293 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:33:13,877 INFO L134 CoverageAnalysis]: Checked inductivity of 5899 backedges. 3541 proven. 136 refuted. 0 times theorem prover too weak. 2222 trivial. 0 not checked. [2021-11-23 17:33:13,877 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:33:20,164 INFO L134 CoverageAnalysis]: Checked inductivity of 5899 backedges. 3612 proven. 65 refuted. 0 times theorem prover too weak. 2222 trivial. 0 not checked. [2021-11-23 17:33:20,165 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1927443855] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:33:20,165 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [502658758] [2021-11-23 17:33:20,165 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:33:20,165 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:33:20,166 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:33:20,178 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:33:20,189 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-11-23 17:33:20,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:33:20,707 INFO L263 TraceCheckSpWp]: Trace formula consists of 1904 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 17:33:20,717 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:33:25,716 INFO L134 CoverageAnalysis]: Checked inductivity of 5899 backedges. 4184 proven. 2 refuted. 0 times theorem prover too weak. 1713 trivial. 0 not checked. [2021-11-23 17:33:25,716 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:33:31,927 INFO L134 CoverageAnalysis]: Checked inductivity of 5899 backedges. 4184 proven. 2 refuted. 0 times theorem prover too weak. 1713 trivial. 0 not checked. [2021-11-23 17:33:31,928 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [502658758] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:33:31,928 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:33:31,932 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 6, 5, 6, 5, 5] total 20 [2021-11-23 17:33:31,932 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [698616697] [2021-11-23 17:33:31,932 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:33:31,939 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-23 17:33:31,939 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:33:31,940 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-23 17:33:31,940 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=308, Unknown=0, NotChecked=0, Total=380 [2021-11-23 17:33:31,941 INFO L87 Difference]: Start difference. First operand 18428 states and 19271 transitions. Second operand has 20 states, 20 states have (on average 162.75) internal successors, (3255), 20 states have internal predecessors, (3255), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:33:59,599 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.21s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:34:28,947 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.83s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:34:31,633 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.72s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:34:54,471 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:34:55,197 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:34:55,197 INFO L93 Difference]: Finished difference Result 42617 states and 44505 transitions. [2021-11-23 17:34:55,199 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-23 17:34:55,200 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 162.75) internal successors, (3255), 20 states have internal predecessors, (3255), 0 states have call successors, (0), 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 1788 [2021-11-23 17:34:55,201 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:34:55,224 INFO L225 Difference]: With dead ends: 42617 [2021-11-23 17:34:55,224 INFO L226 Difference]: Without dead ends: 25178 [2021-11-23 17:34:55,232 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 10765 GetRequests, 10723 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 373 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=332, Invalid=1560, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 17:34:55,233 INFO L933 BasicCegarLoop]: 45 mSDtfsCounter, 7611 mSDsluCounter, 380 mSDsCounter, 0 mSdLazyCounter, 29526 mSolverCounterSat, 833 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 76.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7611 SdHoareTripleChecker+Valid, 425 SdHoareTripleChecker+Invalid, 30360 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 833 IncrementalHoareTripleChecker+Valid, 29526 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 81.8s IncrementalHoareTripleChecker+Time [2021-11-23 17:34:55,234 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7611 Valid, 425 Invalid, 30360 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [833 Valid, 29526 Invalid, 1 Unknown, 0 Unchecked, 81.8s Time] [2021-11-23 17:34:55,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25178 states. [2021-11-23 17:34:55,606 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25178 to 20073. [2021-11-23 17:34:55,621 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20073 states, 20072 states have (on average 1.0424970107612594) internal successors, (20925), 20072 states have internal predecessors, (20925), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:34:55,650 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20073 states to 20073 states and 20925 transitions. [2021-11-23 17:34:55,650 INFO L78 Accepts]: Start accepts. Automaton has 20073 states and 20925 transitions. Word has length 1788 [2021-11-23 17:34:55,652 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:34:55,652 INFO L470 AbstractCegarLoop]: Abstraction has 20073 states and 20925 transitions. [2021-11-23 17:34:55,653 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 162.75) internal successors, (3255), 20 states have internal predecessors, (3255), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:34:55,653 INFO L276 IsEmpty]: Start isEmpty. Operand 20073 states and 20925 transitions. [2021-11-23 17:34:55,694 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1824 [2021-11-23 17:34:55,694 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:34:55,695 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 12, 12, 12, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 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, 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, 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, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 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, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-23 17:34:55,745 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2021-11-23 17:34:55,934 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (24)] Forceful destruction successful, exit code 0 [2021-11-23 17:34:56,113 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (25)] Forceful destruction successful, exit code 0 [2021-11-23 17:34:56,310 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:34:56,310 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:34:56,311 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:34:56,311 INFO L85 PathProgramCache]: Analyzing trace with hash -189219919, now seen corresponding path program 1 times [2021-11-23 17:34:56,318 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:34:56,318 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1483752765] [2021-11-23 17:34:56,319 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:34:56,319 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:34:56,319 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:34:56,320 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:34:56,325 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (27)] Waiting until timeout for monitored process [2021-11-23 17:34:56,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:34:57,033 INFO L263 TraceCheckSpWp]: Trace formula consists of 1955 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 17:34:57,045 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:01,628 INFO L134 CoverageAnalysis]: Checked inductivity of 7242 backedges. 4025 proven. 1656 refuted. 0 times theorem prover too weak. 1561 trivial. 0 not checked. [2021-11-23 17:35:01,628 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:35:22,592 INFO L134 CoverageAnalysis]: Checked inductivity of 7242 backedges. 4909 proven. 79 refuted. 0 times theorem prover too weak. 2254 trivial. 0 not checked. [2021-11-23 17:35:22,592 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:35:22,593 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1483752765] [2021-11-23 17:35:22,593 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1483752765] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:35:22,593 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2053844088] [2021-11-23 17:35:22,593 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:35:22,593 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:35:22,593 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:35:22,594 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:35:22,599 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (28)] Waiting until timeout for monitored process [2021-11-23 17:35:23,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:35:23,351 INFO L263 TraceCheckSpWp]: Trace formula consists of 1955 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 17:35:23,362 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:27,747 INFO L134 CoverageAnalysis]: Checked inductivity of 7242 backedges. 1516 proven. 0 refuted. 0 times theorem prover too weak. 5726 trivial. 0 not checked. [2021-11-23 17:35:27,748 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:35:27,748 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2053844088] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:35:27,748 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:35:27,750 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [7, 4] total 13 [2021-11-23 17:35:27,750 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [634796792] [2021-11-23 17:35:27,750 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:35:27,752 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:35:27,752 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:35:27,752 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:35:27,753 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2021-11-23 17:35:27,753 INFO L87 Difference]: Start difference. First operand 20073 states and 20925 transitions. Second operand has 5 states, 5 states have (on average 88.0) internal successors, (440), 5 states have internal predecessors, (440), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:36,000 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:35:36,000 INFO L93 Difference]: Finished difference Result 37645 states and 39321 transitions. [2021-11-23 17:35:36,007 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 17:35:36,008 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 88.0) internal successors, (440), 5 states have internal predecessors, (440), 0 states have call successors, (0), 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 1823 [2021-11-23 17:35:36,009 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:35:36,024 INFO L225 Difference]: With dead ends: 37645 [2021-11-23 17:35:36,024 INFO L226 Difference]: Without dead ends: 20206 [2021-11-23 17:35:36,033 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5468 GetRequests, 5456 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=40, Invalid=142, Unknown=0, NotChecked=0, Total=182 [2021-11-23 17:35:36,034 INFO L933 BasicCegarLoop]: 433 mSDtfsCounter, 416 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 1733 mSolverCounterSat, 130 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 416 SdHoareTripleChecker+Valid, 460 SdHoareTripleChecker+Invalid, 1863 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 130 IncrementalHoareTripleChecker+Valid, 1733 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:35:36,034 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [416 Valid, 460 Invalid, 1863 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [130 Valid, 1733 Invalid, 0 Unknown, 0 Unchecked, 8.0s Time] [2021-11-23 17:35:36,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20206 states. [2021-11-23 17:35:36,288 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20206 to 19415. [2021-11-23 17:35:36,301 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19415 states, 19414 states have (on average 1.034562686720923) internal successors, (20085), 19414 states have internal predecessors, (20085), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:36,331 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19415 states to 19415 states and 20085 transitions. [2021-11-23 17:35:36,331 INFO L78 Accepts]: Start accepts. Automaton has 19415 states and 20085 transitions. Word has length 1823 [2021-11-23 17:35:36,333 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:35:36,334 INFO L470 AbstractCegarLoop]: Abstraction has 19415 states and 20085 transitions. [2021-11-23 17:35:36,334 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 88.0) internal successors, (440), 5 states have internal predecessors, (440), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:36,334 INFO L276 IsEmpty]: Start isEmpty. Operand 19415 states and 20085 transitions. [2021-11-23 17:35:36,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1908 [2021-11-23 17:35:36,378 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:35:36,379 INFO L514 BasicCegarLoop]: trace histogram [13, 13, 13, 13, 13, 13, 13, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 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, 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, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 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, 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] [2021-11-23 17:35:36,399 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (27)] Forceful destruction successful, exit code 0 [2021-11-23 17:35:36,584 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (28)] Ended with exit code 0 [2021-11-23 17:35:36,782 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:35:36,783 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:35:36,783 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:35:36,783 INFO L85 PathProgramCache]: Analyzing trace with hash 58246438, now seen corresponding path program 1 times [2021-11-23 17:35:36,790 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:35:36,790 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1913373172] [2021-11-23 17:35:36,790 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:35:36,790 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:35:36,791 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:35:36,791 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:35:36,806 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (29)] Waiting until timeout for monitored process [2021-11-23 17:35:37,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:35:37,558 INFO L263 TraceCheckSpWp]: Trace formula consists of 2048 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 17:35:37,568 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:42,117 INFO L134 CoverageAnalysis]: Checked inductivity of 8423 backedges. 4642 proven. 1656 refuted. 0 times theorem prover too weak. 2125 trivial. 0 not checked. [2021-11-23 17:35:42,117 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:36:02,736 INFO L134 CoverageAnalysis]: Checked inductivity of 8423 backedges. 5526 proven. 79 refuted. 0 times theorem prover too weak. 2818 trivial. 0 not checked. [2021-11-23 17:36:02,737 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:36:02,737 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1913373172] [2021-11-23 17:36:02,737 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1913373172] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:36:02,737 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2060552878] [2021-11-23 17:36:02,737 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:36:02,737 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:36:02,737 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:36:02,738 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:36:02,739 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (30)] Waiting until timeout for monitored process [2021-11-23 17:36:03,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:36:03,539 INFO L263 TraceCheckSpWp]: Trace formula consists of 2048 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:36:03,550 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:36:06,256 INFO L134 CoverageAnalysis]: Checked inductivity of 8423 backedges. 4720 proven. 0 refuted. 0 times theorem prover too weak. 3703 trivial. 0 not checked. [2021-11-23 17:36:06,256 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:36:06,257 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2060552878] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:36:06,257 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:36:06,259 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [7, 4] total 11 [2021-11-23 17:36:06,259 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [812874699] [2021-11-23 17:36:06,260 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:36:06,261 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:36:06,262 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:36:06,283 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:36:06,283 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-11-23 17:36:06,283 INFO L87 Difference]: Start difference. First operand 19415 states and 20085 transitions. Second operand has 3 states, 3 states have (on average 213.33333333333334) internal successors, (640), 3 states have internal predecessors, (640), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:36:11,513 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:36:11,513 INFO L93 Difference]: Finished difference Result 37512 states and 38870 transitions. [2021-11-23 17:36:11,521 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:36:11,521 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 213.33333333333334) internal successors, (640), 3 states have internal predecessors, (640), 0 states have call successors, (0), 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 1907 [2021-11-23 17:36:11,523 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:36:11,539 INFO L225 Difference]: With dead ends: 37512 [2021-11-23 17:36:11,539 INFO L226 Difference]: Without dead ends: 19086 [2021-11-23 17:36:11,548 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5718 GetRequests, 5709 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-11-23 17:36:11,549 INFO L933 BasicCegarLoop]: 405 mSDtfsCounter, 209 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 756 mSolverCounterSat, 58 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 209 SdHoareTripleChecker+Valid, 410 SdHoareTripleChecker+Invalid, 814 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 58 IncrementalHoareTripleChecker+Valid, 756 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:36:11,549 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [209 Valid, 410 Invalid, 814 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [58 Valid, 756 Invalid, 0 Unknown, 0 Unchecked, 5.1s Time] [2021-11-23 17:36:11,567 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19086 states. [2021-11-23 17:36:11,755 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19086 to 17112. [2021-11-23 17:36:11,765 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17112 states, 17111 states have (on average 1.0296885044708082) internal successors, (17619), 17111 states have internal predecessors, (17619), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:36:11,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17112 states to 17112 states and 17619 transitions. [2021-11-23 17:36:11,782 INFO L78 Accepts]: Start accepts. Automaton has 17112 states and 17619 transitions. Word has length 1907 [2021-11-23 17:36:11,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:36:11,783 INFO L470 AbstractCegarLoop]: Abstraction has 17112 states and 17619 transitions. [2021-11-23 17:36:11,783 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 213.33333333333334) internal successors, (640), 3 states have internal predecessors, (640), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:36:11,783 INFO L276 IsEmpty]: Start isEmpty. Operand 17112 states and 17619 transitions. [2021-11-23 17:36:11,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1983 [2021-11-23 17:36:11,878 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:36:11,879 INFO L514 BasicCegarLoop]: trace histogram [13, 13, 13, 13, 13, 13, 13, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 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, 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, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 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, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-23 17:36:11,882 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (30)] Ended with exit code 0 [2021-11-23 17:36:12,098 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (29)] Ended with exit code 0 [2021-11-23 17:36:12,282 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:36:12,283 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:36:12,283 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:36:12,283 INFO L85 PathProgramCache]: Analyzing trace with hash 875847817, now seen corresponding path program 1 times [2021-11-23 17:36:12,290 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:36:12,290 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1192153277] [2021-11-23 17:36:12,291 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:36:12,291 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:36:12,291 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:36:12,292 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:36:12,293 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (31)] Waiting until timeout for monitored process [2021-11-23 17:36:12,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:36:12,944 INFO L263 TraceCheckSpWp]: Trace formula consists of 2122 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 17:36:12,955 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:36:17,626 INFO L134 CoverageAnalysis]: Checked inductivity of 8770 backedges. 4800 proven. 1656 refuted. 0 times theorem prover too weak. 2314 trivial. 0 not checked. [2021-11-23 17:36:17,626 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:36:38,137 INFO L134 CoverageAnalysis]: Checked inductivity of 8770 backedges. 5684 proven. 79 refuted. 0 times theorem prover too weak. 3007 trivial. 0 not checked. [2021-11-23 17:36:38,138 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:36:38,138 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1192153277] [2021-11-23 17:36:38,138 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1192153277] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:36:38,138 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1643221] [2021-11-23 17:36:38,138 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:36:38,138 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:36:38,138 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:36:38,139 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:36:38,142 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_895075c3-ba1a-4a87-b718-88f71bcbf45c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (32)] Waiting until timeout for monitored process [2021-11-23 17:36:38,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:36:38,939 INFO L263 TraceCheckSpWp]: Trace formula consists of 2122 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:36:38,949 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:36:41,074 INFO L134 CoverageAnalysis]: Checked inductivity of 8770 backedges. 107 proven. 0 refuted. 0 times theorem prover too weak. 8663 trivial. 0 not checked. [2021-11-23 17:36:41,074 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:36:41,075 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1643221] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:36:41,075 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:36:41,076 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [7, 4] total 11 [2021-11-23 17:36:41,077 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1609135688] [2021-11-23 17:36:41,077 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:36:41,078 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:36:41,078 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:36:41,078 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:36:41,078 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-11-23 17:36:41,078 INFO L87 Difference]: Start difference. First operand 17112 states and 17619 transitions. Second operand has 3 states, 3 states have (on average 90.33333333333333) internal successors, (271), 3 states have internal predecessors, (271), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)