./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/list-ext-properties/960521-1_1-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 53f42b1a Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/list-ext-properties/960521-1_1-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 2b468f3c6542f32922018ecd35f248815c64c681a62a7333b987abbfb42d9345 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-21 00:13:37,174 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-21 00:13:37,177 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-21 00:13:37,231 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-21 00:13:37,232 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-21 00:13:37,236 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-21 00:13:37,239 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-21 00:13:37,243 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-21 00:13:37,245 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-21 00:13:37,251 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-21 00:13:37,252 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-21 00:13:37,254 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-21 00:13:37,255 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-21 00:13:37,257 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-21 00:13:37,259 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-21 00:13:37,261 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-21 00:13:37,263 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-21 00:13:37,264 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-21 00:13:37,269 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-21 00:13:37,277 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-21 00:13:37,279 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-21 00:13:37,280 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-21 00:13:37,283 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-21 00:13:37,284 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-21 00:13:37,293 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-21 00:13:37,294 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-21 00:13:37,294 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-21 00:13:37,296 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-21 00:13:37,297 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-21 00:13:37,298 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-21 00:13:37,299 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-21 00:13:37,300 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-21 00:13:37,302 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-21 00:13:37,303 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-21 00:13:37,305 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-21 00:13:37,305 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-21 00:13:37,306 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-21 00:13:37,306 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-21 00:13:37,307 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-21 00:13:37,307 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-21 00:13:37,308 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-21 00:13:37,309 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2021-11-21 00:13:37,338 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-21 00:13:37,338 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-21 00:13:37,338 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-21 00:13:37,339 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-21 00:13:37,339 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-21 00:13:37,339 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-21 00:13:37,340 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-21 00:13:37,340 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-21 00:13:37,340 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-21 00:13:37,340 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-21 00:13:37,340 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-21 00:13:37,341 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-21 00:13:37,341 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-21 00:13:37,341 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-21 00:13:37,341 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-21 00:13:37,341 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-21 00:13:37,342 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-21 00:13:37,342 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-21 00:13:37,342 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-21 00:13:37,343 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-21 00:13:37,343 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-21 00:13:37,343 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-21 00:13:37,343 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-11-21 00:13:37,343 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-21 00:13:37,344 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-21 00:13:37,344 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-21 00:13:37,344 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-11-21 00:13:37,344 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-11-21 00:13:37,344 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-11-21 00:13:37,344 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-21 00:13:37,345 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-21 00:13:37,345 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-21 00:13:37,345 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-21 00:13:37,345 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-21 00:13:37,345 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-21 00:13:37,345 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 00:13:37,346 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-21 00:13:37,347 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-21 00:13:37,347 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-21 00:13:37,347 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-21 00:13:37,347 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-21 00:13:37,347 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-21 00:13:37,348 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_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 2b468f3c6542f32922018ecd35f248815c64c681a62a7333b987abbfb42d9345 [2021-11-21 00:13:37,638 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-21 00:13:37,664 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-21 00:13:37,666 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-21 00:13:37,668 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-21 00:13:37,668 INFO L275 PluginConnector]: CDTParser initialized [2021-11-21 00:13:37,670 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/list-ext-properties/960521-1_1-2.i [2021-11-21 00:13:37,749 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/data/d3f1e3f00/74d06a9f250d43129cc3876a2bdf3976/FLAG3403f61bb [2021-11-21 00:13:38,320 INFO L306 CDTParser]: Found 1 translation units. [2021-11-21 00:13:38,321 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/sv-benchmarks/c/list-ext-properties/960521-1_1-2.i [2021-11-21 00:13:38,347 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/data/d3f1e3f00/74d06a9f250d43129cc3876a2bdf3976/FLAG3403f61bb [2021-11-21 00:13:38,586 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/data/d3f1e3f00/74d06a9f250d43129cc3876a2bdf3976 [2021-11-21 00:13:38,589 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-21 00:13:38,590 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-21 00:13:38,592 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-21 00:13:38,592 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-21 00:13:38,598 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-21 00:13:38,599 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 12:13:38" (1/1) ... [2021-11-21 00:13:38,601 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4b435050 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:13:38, skipping insertion in model container [2021-11-21 00:13:38,602 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 12:13:38" (1/1) ... [2021-11-21 00:13:38,610 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-21 00:13:38,667 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-21 00:13:38,977 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 00:13:38,985 INFO L203 MainTranslator]: Completed pre-run [2021-11-21 00:13:39,022 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 00:13:39,057 INFO L208 MainTranslator]: Completed translation [2021-11-21 00:13:39,058 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:13:39 WrapperNode [2021-11-21 00:13:39,058 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-21 00:13:39,059 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-21 00:13:39,060 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-21 00:13:39,060 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-21 00:13:39,067 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:13:39" (1/1) ... [2021-11-21 00:13:39,107 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:13:39" (1/1) ... [2021-11-21 00:13:39,140 INFO L137 Inliner]: procedures = 122, calls = 18, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 78 [2021-11-21 00:13:39,140 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-21 00:13:39,141 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-21 00:13:39,142 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-21 00:13:39,142 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-21 00:13:39,150 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:13:39" (1/1) ... [2021-11-21 00:13:39,150 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:13:39" (1/1) ... [2021-11-21 00:13:39,165 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:13:39" (1/1) ... [2021-11-21 00:13:39,166 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:13:39" (1/1) ... [2021-11-21 00:13:39,174 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:13:39" (1/1) ... [2021-11-21 00:13:39,180 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:13:39" (1/1) ... [2021-11-21 00:13:39,186 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:13:39" (1/1) ... [2021-11-21 00:13:39,191 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-21 00:13:39,201 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-21 00:13:39,201 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-21 00:13:39,201 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-21 00:13:39,202 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:13:39" (1/1) ... [2021-11-21 00:13:39,214 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 00:13:39,225 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:13:39,238 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-21 00:13:39,245 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-21 00:13:39,281 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-21 00:13:39,281 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-21 00:13:39,281 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-11-21 00:13:39,281 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-21 00:13:39,282 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-21 00:13:39,282 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-21 00:13:39,282 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-21 00:13:39,282 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-21 00:13:39,367 INFO L236 CfgBuilder]: Building ICFG [2021-11-21 00:13:39,369 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-21 00:13:39,565 INFO L277 CfgBuilder]: Performing block encoding [2021-11-21 00:13:39,594 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-21 00:13:39,595 INFO L301 CfgBuilder]: Removed 3 assume(true) statements. [2021-11-21 00:13:39,597 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 12:13:39 BoogieIcfgContainer [2021-11-21 00:13:39,597 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-21 00:13:39,599 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-21 00:13:39,599 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-21 00:13:39,602 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-21 00:13:39,603 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 12:13:38" (1/3) ... [2021-11-21 00:13:39,603 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@61506c27 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 12:13:39, skipping insertion in model container [2021-11-21 00:13:39,604 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:13:39" (2/3) ... [2021-11-21 00:13:39,604 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@61506c27 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 12:13:39, skipping insertion in model container [2021-11-21 00:13:39,604 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 12:13:39" (3/3) ... [2021-11-21 00:13:39,605 INFO L111 eAbstractionObserver]: Analyzing ICFG 960521-1_1-2.i [2021-11-21 00:13:39,611 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-21 00:13:39,611 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 23 error locations. [2021-11-21 00:13:39,656 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-21 00:13:39,663 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=false, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, 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 [2021-11-21 00:13:39,663 INFO L340 AbstractCegarLoop]: Starting to check reachability of 23 error locations. [2021-11-21 00:13:39,679 INFO L276 IsEmpty]: Start isEmpty. Operand has 50 states, 26 states have (on average 2.076923076923077) internal successors, (54), 49 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:39,687 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2021-11-21 00:13:39,687 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:13:39,688 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2021-11-21 00:13:39,688 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 19 more)] === [2021-11-21 00:13:39,694 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:13:39,694 INFO L85 PathProgramCache]: Analyzing trace with hash 3886798, now seen corresponding path program 1 times [2021-11-21 00:13:39,703 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:13:39,704 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2084598325] [2021-11-21 00:13:39,704 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:13:39,705 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:13:39,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:13:39,853 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:13:39,854 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:13:39,854 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2084598325] [2021-11-21 00:13:39,865 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2084598325] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:13:39,865 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:13:39,866 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-21 00:13:39,868 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [474138916] [2021-11-21 00:13:39,869 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:13:39,874 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-21 00:13:39,874 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:13:39,918 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-21 00:13:39,920 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-21 00:13:39,922 INFO L87 Difference]: Start difference. First operand has 50 states, 26 states have (on average 2.076923076923077) internal successors, (54), 49 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 2 states, 2 states have (on average 2.0) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:39,976 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:13:39,976 INFO L93 Difference]: Finished difference Result 50 states and 53 transitions. [2021-11-21 00:13:39,977 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-21 00:13:39,979 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 2.0) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 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 4 [2021-11-21 00:13:39,985 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:13:39,993 INFO L225 Difference]: With dead ends: 50 [2021-11-21 00:13:39,993 INFO L226 Difference]: Without dead ends: 49 [2021-11-21 00:13:39,995 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-21 00:13:39,999 INFO L933 BasicCegarLoop]: 46 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 7 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 7 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 7 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:13:40,000 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 46 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 7 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:13:40,017 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-11-21 00:13:40,037 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2021-11-21 00:13:40,039 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 26 states have (on average 2.0) internal successors, (52), 48 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:40,043 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 52 transitions. [2021-11-21 00:13:40,045 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 52 transitions. Word has length 4 [2021-11-21 00:13:40,045 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:13:40,045 INFO L470 AbstractCegarLoop]: Abstraction has 49 states and 52 transitions. [2021-11-21 00:13:40,045 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 2.0) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:40,046 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 52 transitions. [2021-11-21 00:13:40,046 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-11-21 00:13:40,046 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:13:40,047 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2021-11-21 00:13:40,047 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-21 00:13:40,047 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 19 more)] === [2021-11-21 00:13:40,053 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:13:40,053 INFO L85 PathProgramCache]: Analyzing trace with hash 120276391, now seen corresponding path program 1 times [2021-11-21 00:13:40,053 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:13:40,054 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1461813515] [2021-11-21 00:13:40,054 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:13:40,055 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:13:40,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:13:40,133 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:13:40,134 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:13:40,134 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1461813515] [2021-11-21 00:13:40,134 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1461813515] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:13:40,135 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:13:40,135 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-21 00:13:40,135 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1831357566] [2021-11-21 00:13:40,135 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:13:40,137 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:13:40,137 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:13:40,137 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:13:40,138 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:13:40,138 INFO L87 Difference]: Start difference. First operand 49 states and 52 transitions. Second operand has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:40,219 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:13:40,219 INFO L93 Difference]: Finished difference Result 48 states and 51 transitions. [2021-11-21 00:13:40,220 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:13:40,220 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 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 5 [2021-11-21 00:13:40,220 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:13:40,221 INFO L225 Difference]: With dead ends: 48 [2021-11-21 00:13:40,222 INFO L226 Difference]: Without dead ends: 48 [2021-11-21 00:13:40,222 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:13:40,229 INFO L933 BasicCegarLoop]: 44 mSDtfsCounter, 1 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 72 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:13:40,229 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 72 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 28 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:13:40,230 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-11-21 00:13:40,234 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2021-11-21 00:13:40,235 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 26 states have (on average 1.9615384615384615) internal successors, (51), 47 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:40,236 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 51 transitions. [2021-11-21 00:13:40,236 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 51 transitions. Word has length 5 [2021-11-21 00:13:40,236 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:13:40,237 INFO L470 AbstractCegarLoop]: Abstraction has 48 states and 51 transitions. [2021-11-21 00:13:40,237 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:40,237 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 51 transitions. [2021-11-21 00:13:40,237 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-11-21 00:13:40,238 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:13:40,238 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2021-11-21 00:13:40,238 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-21 00:13:40,238 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 19 more)] === [2021-11-21 00:13:40,239 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:13:40,239 INFO L85 PathProgramCache]: Analyzing trace with hash 120276392, now seen corresponding path program 1 times [2021-11-21 00:13:40,240 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:13:40,240 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [472794975] [2021-11-21 00:13:40,240 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:13:40,240 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:13:40,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:13:40,306 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:13:40,306 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:13:40,306 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [472794975] [2021-11-21 00:13:40,307 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [472794975] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:13:40,307 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:13:40,307 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-21 00:13:40,307 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [227955142] [2021-11-21 00:13:40,308 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:13:40,309 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:13:40,309 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:13:40,310 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:13:40,310 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:13:40,310 INFO L87 Difference]: Start difference. First operand 48 states and 51 transitions. Second operand has 4 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:40,433 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:13:40,433 INFO L93 Difference]: Finished difference Result 94 states and 100 transitions. [2021-11-21 00:13:40,436 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 00:13:40,436 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 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 5 [2021-11-21 00:13:40,437 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:13:40,440 INFO L225 Difference]: With dead ends: 94 [2021-11-21 00:13:40,441 INFO L226 Difference]: Without dead ends: 94 [2021-11-21 00:13:40,441 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-21 00:13:40,442 INFO L933 BasicCegarLoop]: 38 mSDtfsCounter, 45 mSDsluCounter, 71 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 109 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:13:40,443 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [45 Valid, 109 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:13:40,447 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2021-11-21 00:13:40,458 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 52. [2021-11-21 00:13:40,458 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 30 states have (on average 1.8666666666666667) internal successors, (56), 51 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:40,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 56 transitions. [2021-11-21 00:13:40,459 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 56 transitions. Word has length 5 [2021-11-21 00:13:40,460 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:13:40,460 INFO L470 AbstractCegarLoop]: Abstraction has 52 states and 56 transitions. [2021-11-21 00:13:40,460 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:40,460 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 56 transitions. [2021-11-21 00:13:40,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-21 00:13:40,461 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:13:40,461 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:13:40,461 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-21 00:13:40,462 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 19 more)] === [2021-11-21 00:13:40,462 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:13:40,462 INFO L85 PathProgramCache]: Analyzing trace with hash -378427463, now seen corresponding path program 1 times [2021-11-21 00:13:40,463 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:13:40,463 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1528224406] [2021-11-21 00:13:40,463 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:13:40,463 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:13:40,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:13:40,538 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:13:40,538 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:13:40,538 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1528224406] [2021-11-21 00:13:40,539 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1528224406] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:13:40,539 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:13:40,539 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 00:13:40,539 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1988403044] [2021-11-21 00:13:40,539 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:13:40,540 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:13:40,540 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:13:40,540 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:13:40,541 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:13:40,541 INFO L87 Difference]: Start difference. First operand 52 states and 56 transitions. Second operand has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 4 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:40,581 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:13:40,581 INFO L93 Difference]: Finished difference Result 49 states and 53 transitions. [2021-11-21 00:13:40,581 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:13:40,582 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 4 states have internal predecessors, (7), 0 states have call successors, (0), 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 7 [2021-11-21 00:13:40,582 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:13:40,583 INFO L225 Difference]: With dead ends: 49 [2021-11-21 00:13:40,583 INFO L226 Difference]: Without dead ends: 49 [2021-11-21 00:13:40,583 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:13:40,585 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 27 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 54 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:13:40,585 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 54 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:13:40,587 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-11-21 00:13:40,589 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2021-11-21 00:13:40,590 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 30 states have (on average 1.7666666666666666) internal successors, (53), 48 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:40,591 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 53 transitions. [2021-11-21 00:13:40,591 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 53 transitions. Word has length 7 [2021-11-21 00:13:40,591 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:13:40,591 INFO L470 AbstractCegarLoop]: Abstraction has 49 states and 53 transitions. [2021-11-21 00:13:40,592 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 4 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:40,592 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 53 transitions. [2021-11-21 00:13:40,592 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-21 00:13:40,592 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:13:40,593 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:13:40,593 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-21 00:13:40,593 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 19 more)] === [2021-11-21 00:13:40,594 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:13:40,594 INFO L85 PathProgramCache]: Analyzing trace with hash -378427462, now seen corresponding path program 1 times [2021-11-21 00:13:40,594 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:13:40,594 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [190481083] [2021-11-21 00:13:40,594 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:13:40,595 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:13:40,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:13:40,729 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:13:40,730 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:13:40,730 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [190481083] [2021-11-21 00:13:40,730 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [190481083] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:13:40,730 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:13:40,731 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-21 00:13:40,731 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [58142462] [2021-11-21 00:13:40,731 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:13:40,732 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-21 00:13:40,734 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:13:40,734 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-21 00:13:40,735 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:13:40,735 INFO L87 Difference]: Start difference. First operand 49 states and 53 transitions. Second operand has 6 states, 5 states have (on average 1.4) internal successors, (7), 5 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:40,841 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:13:40,842 INFO L93 Difference]: Finished difference Result 85 states and 90 transitions. [2021-11-21 00:13:40,842 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 00:13:40,843 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 1.4) internal successors, (7), 5 states have internal predecessors, (7), 0 states have call successors, (0), 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 7 [2021-11-21 00:13:40,844 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:13:40,846 INFO L225 Difference]: With dead ends: 85 [2021-11-21 00:13:40,847 INFO L226 Difference]: Without dead ends: 85 [2021-11-21 00:13:40,850 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:13:40,858 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 41 mSDsluCounter, 76 mSDsCounter, 0 mSdLazyCounter, 93 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 101 SdHoareTripleChecker+Invalid, 101 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 93 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:13:40,861 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [41 Valid, 101 Invalid, 101 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 93 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:13:40,863 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2021-11-21 00:13:40,870 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 59. [2021-11-21 00:13:40,872 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 40 states have (on average 1.75) internal successors, (70), 58 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:40,874 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 70 transitions. [2021-11-21 00:13:40,875 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 70 transitions. Word has length 7 [2021-11-21 00:13:40,876 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:13:40,876 INFO L470 AbstractCegarLoop]: Abstraction has 59 states and 70 transitions. [2021-11-21 00:13:40,881 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 1.4) internal successors, (7), 5 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:40,882 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 70 transitions. [2021-11-21 00:13:40,882 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-21 00:13:40,883 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:13:40,883 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1] [2021-11-21 00:13:40,883 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-21 00:13:40,883 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 19 more)] === [2021-11-21 00:13:40,884 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:13:40,884 INFO L85 PathProgramCache]: Analyzing trace with hash -376933491, now seen corresponding path program 1 times [2021-11-21 00:13:40,884 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:13:40,885 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1224166043] [2021-11-21 00:13:40,886 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:13:40,886 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:13:40,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:13:40,971 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:13:40,972 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:13:40,972 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1224166043] [2021-11-21 00:13:40,972 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1224166043] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:13:40,973 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1832203904] [2021-11-21 00:13:40,973 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:13:40,973 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:13:40,973 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:13:40,982 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:13:41,014 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-21 00:13:41,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:13:41,060 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-21 00:13:41,065 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:13:41,187 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-21 00:13:41,188 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 18 [2021-11-21 00:13:41,279 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:13:41,280 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:13:41,280 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1832203904] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:13:41,280 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:13:41,281 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3] total 5 [2021-11-21 00:13:41,281 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [381938798] [2021-11-21 00:13:41,281 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:13:41,281 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 00:13:41,282 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:13:41,282 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 00:13:41,282 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-11-21 00:13:41,289 INFO L87 Difference]: Start difference. First operand 59 states and 70 transitions. Second operand has 5 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:41,418 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:13:41,418 INFO L93 Difference]: Finished difference Result 84 states and 89 transitions. [2021-11-21 00:13:41,419 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 00:13:41,421 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 0 states have call successors, (0), 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 7 [2021-11-21 00:13:41,422 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:13:41,423 INFO L225 Difference]: With dead ends: 84 [2021-11-21 00:13:41,423 INFO L226 Difference]: Without dead ends: 84 [2021-11-21 00:13:41,423 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2021-11-21 00:13:41,426 INFO L933 BasicCegarLoop]: 64 mSDtfsCounter, 80 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 62 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 80 SdHoareTripleChecker+Valid, 151 SdHoareTripleChecker+Invalid, 64 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 62 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:13:41,429 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [80 Valid, 151 Invalid, 64 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 62 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:13:41,430 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2021-11-21 00:13:41,434 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 58. [2021-11-21 00:13:41,437 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 40 states have (on average 1.725) internal successors, (69), 57 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:41,439 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 69 transitions. [2021-11-21 00:13:41,439 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 69 transitions. Word has length 7 [2021-11-21 00:13:41,440 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:13:41,440 INFO L470 AbstractCegarLoop]: Abstraction has 58 states and 69 transitions. [2021-11-21 00:13:41,440 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:41,440 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 69 transitions. [2021-11-21 00:13:41,441 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-21 00:13:41,441 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:13:41,441 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:13:41,480 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-21 00:13:41,666 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:13:41,667 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 19 more)] === [2021-11-21 00:13:41,667 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:13:41,667 INFO L85 PathProgramCache]: Analyzing trace with hash 1403493503, now seen corresponding path program 1 times [2021-11-21 00:13:41,667 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:13:41,668 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1703117766] [2021-11-21 00:13:41,668 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:13:41,668 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:13:41,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:13:41,732 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:13:41,733 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:13:41,733 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1703117766] [2021-11-21 00:13:41,733 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1703117766] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:13:41,733 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1174066416] [2021-11-21 00:13:41,733 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:13:41,734 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:13:41,734 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:13:41,735 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:13:41,766 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-21 00:13:41,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:13:41,803 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-21 00:13:41,805 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:13:41,899 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:13:41,899 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:13:41,900 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1174066416] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:13:41,900 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:13:41,900 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4] total 7 [2021-11-21 00:13:41,900 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1845993612] [2021-11-21 00:13:41,900 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:13:41,901 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 00:13:41,901 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:13:41,901 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 00:13:41,902 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=32, Unknown=0, NotChecked=0, Total=56 [2021-11-21 00:13:41,902 INFO L87 Difference]: Start difference. First operand 58 states and 69 transitions. Second operand has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:41,948 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:13:41,948 INFO L93 Difference]: Finished difference Result 82 states and 86 transitions. [2021-11-21 00:13:41,948 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 00:13:41,949 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2021-11-21 00:13:41,949 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:13:41,949 INFO L225 Difference]: With dead ends: 82 [2021-11-21 00:13:41,949 INFO L226 Difference]: Without dead ends: 82 [2021-11-21 00:13:41,950 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=24, Invalid=32, Unknown=0, NotChecked=0, Total=56 [2021-11-21 00:13:41,951 INFO L933 BasicCegarLoop]: 35 mSDtfsCounter, 33 mSDsluCounter, 94 mSDsCounter, 0 mSdLazyCounter, 45 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 129 SdHoareTripleChecker+Invalid, 47 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 45 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:13:41,952 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 129 Invalid, 47 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 45 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:13:41,953 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2021-11-21 00:13:41,962 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 57. [2021-11-21 00:13:41,962 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 39 states have (on average 1.6923076923076923) internal successors, (66), 56 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:41,965 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 66 transitions. [2021-11-21 00:13:41,966 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 66 transitions. Word has length 9 [2021-11-21 00:13:41,966 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:13:41,966 INFO L470 AbstractCegarLoop]: Abstraction has 57 states and 66 transitions. [2021-11-21 00:13:41,966 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:41,966 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 66 transitions. [2021-11-21 00:13:41,968 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-21 00:13:41,970 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:13:41,970 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:13:42,003 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-21 00:13:42,197 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:13:42,197 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 19 more)] === [2021-11-21 00:13:42,197 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:13:42,198 INFO L85 PathProgramCache]: Analyzing trace with hash -1455755169, now seen corresponding path program 1 times [2021-11-21 00:13:42,198 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:13:42,198 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [111623628] [2021-11-21 00:13:42,198 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:13:42,198 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:13:42,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:13:42,332 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:13:42,332 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:13:42,332 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [111623628] [2021-11-21 00:13:42,332 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [111623628] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:13:42,333 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [718684468] [2021-11-21 00:13:42,333 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:13:42,333 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:13:42,333 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:13:42,334 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:13:42,350 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-21 00:13:42,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:13:42,384 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-21 00:13:42,385 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:13:42,436 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-21 00:13:42,436 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 18 [2021-11-21 00:13:42,554 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:13:42,554 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:13:42,555 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [718684468] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:13:42,555 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:13:42,555 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [5] total 8 [2021-11-21 00:13:42,555 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2089668636] [2021-11-21 00:13:42,555 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:13:42,557 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-21 00:13:42,557 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:13:42,558 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-21 00:13:42,558 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2021-11-21 00:13:42,558 INFO L87 Difference]: Start difference. First operand 57 states and 66 transitions. Second operand has 6 states, 5 states have (on average 1.8) internal successors, (9), 5 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:42,712 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:13:42,712 INFO L93 Difference]: Finished difference Result 86 states and 90 transitions. [2021-11-21 00:13:42,713 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 00:13:42,713 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 1.8) internal successors, (9), 5 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2021-11-21 00:13:42,713 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:13:42,714 INFO L225 Difference]: With dead ends: 86 [2021-11-21 00:13:42,714 INFO L226 Difference]: Without dead ends: 86 [2021-11-21 00:13:42,714 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2021-11-21 00:13:42,715 INFO L933 BasicCegarLoop]: 49 mSDtfsCounter, 133 mSDsluCounter, 88 mSDsCounter, 0 mSdLazyCounter, 111 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 133 SdHoareTripleChecker+Valid, 137 SdHoareTripleChecker+Invalid, 122 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 111 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:13:42,715 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [133 Valid, 137 Invalid, 122 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 111 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:13:42,716 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2021-11-21 00:13:42,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 53. [2021-11-21 00:13:42,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 37 states have (on average 1.5405405405405406) internal successors, (57), 52 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:42,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 57 transitions. [2021-11-21 00:13:42,720 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 57 transitions. Word has length 9 [2021-11-21 00:13:42,720 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:13:42,720 INFO L470 AbstractCegarLoop]: Abstraction has 53 states and 57 transitions. [2021-11-21 00:13:42,720 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 1.8) internal successors, (9), 5 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:42,720 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 57 transitions. [2021-11-21 00:13:42,721 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-21 00:13:42,721 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:13:42,721 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:13:42,754 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-21 00:13:42,946 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2021-11-21 00:13:42,947 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr6REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 19 more)] === [2021-11-21 00:13:42,947 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:13:42,947 INFO L85 PathProgramCache]: Analyzing trace with hash 558700926, now seen corresponding path program 1 times [2021-11-21 00:13:42,947 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:13:42,947 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [289007804] [2021-11-21 00:13:42,948 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:13:42,948 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:13:42,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:13:42,982 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 00:13:42,982 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:13:42,982 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [289007804] [2021-11-21 00:13:42,982 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [289007804] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:13:42,983 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:13:42,983 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 00:13:42,983 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [344530906] [2021-11-21 00:13:42,983 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:13:42,983 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:13:42,983 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:13:42,984 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:13:42,984 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:13:42,984 INFO L87 Difference]: Start difference. First operand 53 states and 57 transitions. Second operand has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:43,025 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:13:43,025 INFO L93 Difference]: Finished difference Result 50 states and 54 transitions. [2021-11-21 00:13:43,026 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 00:13:43,026 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2021-11-21 00:13:43,026 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:13:43,027 INFO L225 Difference]: With dead ends: 50 [2021-11-21 00:13:43,027 INFO L226 Difference]: Without dead ends: 50 [2021-11-21 00:13:43,027 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-21 00:13:43,028 INFO L933 BasicCegarLoop]: 29 mSDtfsCounter, 16 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:13:43,028 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 56 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:13:43,029 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-11-21 00:13:43,031 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2021-11-21 00:13:43,031 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 37 states have (on average 1.4594594594594594) internal successors, (54), 49 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:43,031 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 54 transitions. [2021-11-21 00:13:43,031 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 54 transitions. Word has length 10 [2021-11-21 00:13:43,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:13:43,032 INFO L470 AbstractCegarLoop]: Abstraction has 50 states and 54 transitions. [2021-11-21 00:13:43,032 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:43,032 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 54 transitions. [2021-11-21 00:13:43,032 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-21 00:13:43,033 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:13:43,033 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:13:43,033 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-21 00:13:43,033 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 19 more)] === [2021-11-21 00:13:43,033 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:13:43,033 INFO L85 PathProgramCache]: Analyzing trace with hash 558700927, now seen corresponding path program 1 times [2021-11-21 00:13:43,034 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:13:43,034 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1879075315] [2021-11-21 00:13:43,034 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:13:43,034 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:13:43,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:13:43,156 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 00:13:43,157 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:13:43,157 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1879075315] [2021-11-21 00:13:43,157 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1879075315] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:13:43,157 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:13:43,157 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-21 00:13:43,157 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [170783527] [2021-11-21 00:13:43,157 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:13:43,158 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-21 00:13:43,158 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:13:43,158 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-21 00:13:43,158 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:13:43,159 INFO L87 Difference]: Start difference. First operand 50 states and 54 transitions. Second operand has 6 states, 5 states have (on average 2.0) internal successors, (10), 5 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:43,227 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:13:43,227 INFO L93 Difference]: Finished difference Result 67 states and 69 transitions. [2021-11-21 00:13:43,227 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 00:13:43,227 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.0) internal successors, (10), 5 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2021-11-21 00:13:43,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:13:43,228 INFO L225 Difference]: With dead ends: 67 [2021-11-21 00:13:43,228 INFO L226 Difference]: Without dead ends: 67 [2021-11-21 00:13:43,228 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:13:43,229 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 90 mSDsluCounter, 35 mSDsCounter, 0 mSdLazyCounter, 66 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 90 SdHoareTripleChecker+Valid, 50 SdHoareTripleChecker+Invalid, 75 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 66 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:13:43,229 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [90 Valid, 50 Invalid, 75 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 66 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:13:43,230 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2021-11-21 00:13:43,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 53. [2021-11-21 00:13:43,233 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 42 states have (on average 1.380952380952381) internal successors, (58), 52 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:43,233 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 58 transitions. [2021-11-21 00:13:43,233 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 58 transitions. Word has length 10 [2021-11-21 00:13:43,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:13:43,234 INFO L470 AbstractCegarLoop]: Abstraction has 53 states and 58 transitions. [2021-11-21 00:13:43,234 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.0) internal successors, (10), 5 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:43,234 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 58 transitions. [2021-11-21 00:13:43,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-21 00:13:43,235 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:13:43,235 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:13:43,235 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-21 00:13:43,235 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 19 more)] === [2021-11-21 00:13:43,235 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:13:43,235 INFO L85 PathProgramCache]: Analyzing trace with hash 1178685412, now seen corresponding path program 1 times [2021-11-21 00:13:43,235 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:13:43,236 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [841901694] [2021-11-21 00:13:43,236 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:13:43,236 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:13:43,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:13:43,369 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:13:43,369 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:13:43,370 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [841901694] [2021-11-21 00:13:43,370 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [841901694] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:13:43,370 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1594104834] [2021-11-21 00:13:43,370 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:13:43,370 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:13:43,370 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:13:43,371 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:13:43,389 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-21 00:13:43,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:13:43,419 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-21 00:13:43,420 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:13:43,475 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-21 00:13:43,476 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 18 [2021-11-21 00:13:43,660 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:13:43,660 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:13:43,829 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:13:43,830 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1594104834] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:13:43,830 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1337205257] [2021-11-21 00:13:43,854 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-21 00:13:43,854 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:13:43,859 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:13:43,866 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:13:43,866 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:13:44,854 INFO L354 Elim1Store]: treesize reduction 23, result has 17.9 percent of original size [2021-11-21 00:13:44,855 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 21 [2021-11-21 00:13:44,875 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2021-11-21 00:13:44,915 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-21 00:13:45,101 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 20 [2021-11-21 00:13:45,391 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:13:45,418 INFO L354 Elim1Store]: treesize reduction 68, result has 25.3 percent of original size [2021-11-21 00:13:45,419 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 142 treesize of output 144 [2021-11-21 00:13:45,859 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 00:13:45,956 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 00:13:46,096 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:13:46,700 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:13:46,700 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:13:46,700 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 5] total 13 [2021-11-21 00:13:46,700 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [993858017] [2021-11-21 00:13:46,701 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:13:46,701 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-21 00:13:46,701 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:13:46,701 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-21 00:13:46,702 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=378, Unknown=0, NotChecked=0, Total=462 [2021-11-21 00:13:46,702 INFO L87 Difference]: Start difference. First operand 53 states and 58 transitions. Second operand has 15 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 14 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:47,008 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:13:47,008 INFO L93 Difference]: Finished difference Result 98 states and 100 transitions. [2021-11-21 00:13:47,009 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-21 00:13:47,009 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 14 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-11-21 00:13:47,009 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:13:47,010 INFO L225 Difference]: With dead ends: 98 [2021-11-21 00:13:47,010 INFO L226 Difference]: Without dead ends: 98 [2021-11-21 00:13:47,010 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 149 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=120, Invalid=480, Unknown=0, NotChecked=0, Total=600 [2021-11-21 00:13:47,011 INFO L933 BasicCegarLoop]: 32 mSDtfsCounter, 284 mSDsluCounter, 112 mSDsCounter, 0 mSdLazyCounter, 235 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 284 SdHoareTripleChecker+Valid, 144 SdHoareTripleChecker+Invalid, 261 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 235 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:13:47,011 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [284 Valid, 144 Invalid, 261 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 235 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 00:13:47,012 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2021-11-21 00:13:47,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 55. [2021-11-21 00:13:47,019 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 44 states have (on average 1.3636363636363635) internal successors, (60), 54 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:47,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 60 transitions. [2021-11-21 00:13:47,020 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 60 transitions. Word has length 11 [2021-11-21 00:13:47,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:13:47,020 INFO L470 AbstractCegarLoop]: Abstraction has 55 states and 60 transitions. [2021-11-21 00:13:47,020 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 14 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:47,020 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 60 transitions. [2021-11-21 00:13:47,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-21 00:13:47,022 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:13:47,022 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1] [2021-11-21 00:13:47,046 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-21 00:13:47,222 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-21 00:13:47,222 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 19 more)] === [2021-11-21 00:13:47,223 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:13:47,223 INFO L85 PathProgramCache]: Analyzing trace with hash -1154620887, now seen corresponding path program 2 times [2021-11-21 00:13:47,223 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:13:47,223 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [677773588] [2021-11-21 00:13:47,223 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:13:47,223 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:13:47,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:13:47,272 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:13:47,272 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:13:47,272 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [677773588] [2021-11-21 00:13:47,273 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [677773588] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:13:47,273 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1542817423] [2021-11-21 00:13:47,273 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:13:47,273 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:13:47,273 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:13:47,274 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:13:47,294 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-21 00:13:47,319 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-21 00:13:47,319 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:13:47,320 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-21 00:13:47,321 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:13:47,346 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-21 00:13:47,346 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 15 [2021-11-21 00:13:47,518 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 00:13:47,519 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:13:47,735 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 00:13:47,736 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1542817423] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:13:47,736 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1508045462] [2021-11-21 00:13:47,738 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-21 00:13:47,738 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:13:47,739 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:13:47,739 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:13:47,739 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:13:48,427 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-21 00:13:48,428 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 15 [2021-11-21 00:13:48,457 INFO L354 Elim1Store]: treesize reduction 23, result has 17.9 percent of original size [2021-11-21 00:13:48,458 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 21 [2021-11-21 00:13:48,534 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-21 00:13:48,674 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 25 [2021-11-21 00:13:48,826 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:48,842 INFO L354 Elim1Store]: treesize reduction 60, result has 13.0 percent of original size [2021-11-21 00:13:48,842 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 147 treesize of output 143 [2021-11-21 00:13:49,179 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 00:13:49,273 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 00:13:49,374 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:13:50,051 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:13:50,051 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:13:50,051 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 4, 4] total 13 [2021-11-21 00:13:50,051 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [619162844] [2021-11-21 00:13:50,051 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:13:50,052 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-21 00:13:50,052 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:13:50,052 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-21 00:13:50,052 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2021-11-21 00:13:50,053 INFO L87 Difference]: Start difference. First operand 55 states and 60 transitions. Second operand has 13 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 13 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:50,564 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:13:50,564 INFO L93 Difference]: Finished difference Result 105 states and 107 transitions. [2021-11-21 00:13:50,564 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-21 00:13:50,564 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 13 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2021-11-21 00:13:50,564 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:13:50,565 INFO L225 Difference]: With dead ends: 105 [2021-11-21 00:13:50,565 INFO L226 Difference]: Without dead ends: 105 [2021-11-21 00:13:50,565 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 163 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=187, Invalid=869, Unknown=0, NotChecked=0, Total=1056 [2021-11-21 00:13:50,566 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 308 mSDsluCounter, 95 mSDsCounter, 0 mSdLazyCounter, 224 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 308 SdHoareTripleChecker+Valid, 107 SdHoareTripleChecker+Invalid, 250 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 224 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:13:50,579 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [308 Valid, 107 Invalid, 250 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 224 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 00:13:50,580 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2021-11-21 00:13:50,582 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 65. [2021-11-21 00:13:50,582 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 55 states have (on average 1.309090909090909) internal successors, (72), 64 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:50,583 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 72 transitions. [2021-11-21 00:13:50,583 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 72 transitions. Word has length 13 [2021-11-21 00:13:50,583 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:13:50,583 INFO L470 AbstractCegarLoop]: Abstraction has 65 states and 72 transitions. [2021-11-21 00:13:50,583 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 13 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:50,583 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 72 transitions. [2021-11-21 00:13:50,584 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-21 00:13:50,584 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:13:50,584 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:13:50,625 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-21 00:13:50,794 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:13:50,795 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr17ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 19 more)] === [2021-11-21 00:13:50,795 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:13:50,795 INFO L85 PathProgramCache]: Analyzing trace with hash 437623665, now seen corresponding path program 1 times [2021-11-21 00:13:50,795 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:13:50,795 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [826397062] [2021-11-21 00:13:50,796 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:13:50,796 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:13:50,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:13:50,838 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 00:13:50,838 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:13:50,839 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [826397062] [2021-11-21 00:13:50,839 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [826397062] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:13:50,839 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:13:50,839 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-21 00:13:50,839 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1336015728] [2021-11-21 00:13:50,839 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:13:50,840 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:13:50,840 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:13:50,840 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:13:50,841 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:13:50,841 INFO L87 Difference]: Start difference. First operand 65 states and 72 transitions. Second operand has 3 states, 2 states have (on average 7.0) internal successors, (14), 3 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:50,857 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:13:50,857 INFO L93 Difference]: Finished difference Result 63 states and 69 transitions. [2021-11-21 00:13:50,857 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:13:50,858 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 7.0) internal successors, (14), 3 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2021-11-21 00:13:50,858 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:13:50,858 INFO L225 Difference]: With dead ends: 63 [2021-11-21 00:13:50,859 INFO L226 Difference]: Without dead ends: 63 [2021-11-21 00:13:50,859 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:13:50,860 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 23 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:13:50,861 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 21 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:13:50,862 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-11-21 00:13:50,864 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2021-11-21 00:13:50,864 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 55 states have (on average 1.2545454545454546) internal successors, (69), 62 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:50,864 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 69 transitions. [2021-11-21 00:13:50,865 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 69 transitions. Word has length 14 [2021-11-21 00:13:50,865 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:13:50,865 INFO L470 AbstractCegarLoop]: Abstraction has 63 states and 69 transitions. [2021-11-21 00:13:50,865 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 7.0) internal successors, (14), 3 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:50,865 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 69 transitions. [2021-11-21 00:13:50,867 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-21 00:13:50,868 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:13:50,868 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:13:50,868 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-11-21 00:13:50,868 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 19 more)] === [2021-11-21 00:13:50,869 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:13:50,869 INFO L85 PathProgramCache]: Analyzing trace with hash -1433435611, now seen corresponding path program 1 times [2021-11-21 00:13:50,869 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:13:50,869 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [322414639] [2021-11-21 00:13:50,869 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:13:50,870 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:13:50,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:13:50,998 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 00:13:50,998 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:13:50,998 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [322414639] [2021-11-21 00:13:50,999 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [322414639] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:13:50,999 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [396674298] [2021-11-21 00:13:50,999 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:13:50,999 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:13:50,999 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:13:51,000 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:13:51,025 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-21 00:13:51,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:13:51,055 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-21 00:13:51,056 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:13:51,094 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-21 00:13:51,095 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 18 [2021-11-21 00:13:51,225 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 00:13:51,225 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:13:51,225 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [396674298] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:13:51,225 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:13:51,225 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6] total 9 [2021-11-21 00:13:51,226 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1251318738] [2021-11-21 00:13:51,226 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:13:51,227 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-21 00:13:51,227 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:13:51,227 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-21 00:13:51,227 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2021-11-21 00:13:51,228 INFO L87 Difference]: Start difference. First operand 63 states and 69 transitions. Second operand has 6 states, 5 states have (on average 2.4) internal successors, (12), 5 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:51,335 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:13:51,335 INFO L93 Difference]: Finished difference Result 74 states and 77 transitions. [2021-11-21 00:13:51,336 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 00:13:51,336 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.4) internal successors, (12), 5 states have internal predecessors, (12), 0 states have call successors, (0), 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 14 [2021-11-21 00:13:51,336 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:13:51,337 INFO L225 Difference]: With dead ends: 74 [2021-11-21 00:13:51,337 INFO L226 Difference]: Without dead ends: 74 [2021-11-21 00:13:51,337 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=45, Invalid=111, Unknown=0, NotChecked=0, Total=156 [2021-11-21 00:13:51,338 INFO L933 BasicCegarLoop]: 29 mSDtfsCounter, 86 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 93 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 86 SdHoareTripleChecker+Valid, 81 SdHoareTripleChecker+Invalid, 101 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 93 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:13:51,338 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [86 Valid, 81 Invalid, 101 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 93 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:13:51,339 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2021-11-21 00:13:51,341 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 57. [2021-11-21 00:13:51,347 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 51 states have (on average 1.196078431372549) internal successors, (61), 56 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:51,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 61 transitions. [2021-11-21 00:13:51,347 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 61 transitions. Word has length 14 [2021-11-21 00:13:51,347 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:13:51,348 INFO L470 AbstractCegarLoop]: Abstraction has 57 states and 61 transitions. [2021-11-21 00:13:51,348 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.4) internal successors, (12), 5 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:51,348 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 61 transitions. [2021-11-21 00:13:51,349 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-21 00:13:51,350 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:13:51,351 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:13:51,386 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-21 00:13:51,551 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-21 00:13:51,551 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr13ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 19 more)] === [2021-11-21 00:13:51,552 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:13:51,552 INFO L85 PathProgramCache]: Analyzing trace with hash -363809595, now seen corresponding path program 1 times [2021-11-21 00:13:51,552 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:13:51,552 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1285213557] [2021-11-21 00:13:51,552 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:13:51,552 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:13:51,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:13:51,663 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 00:13:51,663 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:13:51,663 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1285213557] [2021-11-21 00:13:51,663 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1285213557] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:13:51,664 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:13:51,664 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-21 00:13:51,664 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1777719685] [2021-11-21 00:13:51,664 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:13:51,664 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-21 00:13:51,665 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:13:51,665 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-21 00:13:51,665 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-21 00:13:51,665 INFO L87 Difference]: Start difference. First operand 57 states and 61 transitions. Second operand has 7 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 6 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:51,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:13:51,762 INFO L93 Difference]: Finished difference Result 69 states and 72 transitions. [2021-11-21 00:13:51,762 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 00:13:51,763 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 6 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2021-11-21 00:13:51,763 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:13:51,763 INFO L225 Difference]: With dead ends: 69 [2021-11-21 00:13:51,764 INFO L226 Difference]: Without dead ends: 69 [2021-11-21 00:13:51,764 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=54, Unknown=0, NotChecked=0, Total=90 [2021-11-21 00:13:51,765 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 40 mSDsluCounter, 55 mSDsCounter, 0 mSdLazyCounter, 81 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 89 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 81 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:13:51,765 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 73 Invalid, 89 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 81 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:13:51,766 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2021-11-21 00:13:51,767 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 58. [2021-11-21 00:13:51,768 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 52 states have (on average 1.1923076923076923) internal successors, (62), 57 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:51,768 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 62 transitions. [2021-11-21 00:13:51,768 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 62 transitions. Word has length 16 [2021-11-21 00:13:51,768 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:13:51,769 INFO L470 AbstractCegarLoop]: Abstraction has 58 states and 62 transitions. [2021-11-21 00:13:51,769 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 6 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:51,769 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 62 transitions. [2021-11-21 00:13:51,770 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-21 00:13:51,770 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:13:51,770 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:13:51,770 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-11-21 00:13:51,770 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr20ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 19 more)] === [2021-11-21 00:13:51,771 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:13:51,771 INFO L85 PathProgramCache]: Analyzing trace with hash 2020972930, now seen corresponding path program 1 times [2021-11-21 00:13:51,771 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:13:51,771 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [727199011] [2021-11-21 00:13:51,771 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:13:51,772 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:13:51,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:13:51,801 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 00:13:51,801 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:13:51,801 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [727199011] [2021-11-21 00:13:51,801 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [727199011] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:13:51,802 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:13:51,802 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 00:13:51,802 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2009915369] [2021-11-21 00:13:51,802 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:13:51,802 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:13:51,803 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:13:51,803 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:13:51,803 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:13:51,803 INFO L87 Difference]: Start difference. First operand 58 states and 62 transitions. Second operand has 4 states, 3 states have (on average 5.666666666666667) internal successors, (17), 4 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:51,826 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:13:51,827 INFO L93 Difference]: Finished difference Result 57 states and 61 transitions. [2021-11-21 00:13:51,827 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 00:13:51,827 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 5.666666666666667) internal successors, (17), 4 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2021-11-21 00:13:51,828 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:13:51,828 INFO L225 Difference]: With dead ends: 57 [2021-11-21 00:13:51,828 INFO L226 Difference]: Without dead ends: 57 [2021-11-21 00:13:51,828 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:13:51,829 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 17 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:13:51,829 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 30 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:13:51,830 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-11-21 00:13:51,831 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2021-11-21 00:13:51,832 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 52 states have (on average 1.1730769230769231) internal successors, (61), 56 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:51,832 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 61 transitions. [2021-11-21 00:13:51,832 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 61 transitions. Word has length 17 [2021-11-21 00:13:51,832 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:13:51,833 INFO L470 AbstractCegarLoop]: Abstraction has 57 states and 61 transitions. [2021-11-21 00:13:51,833 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 5.666666666666667) internal successors, (17), 4 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:51,833 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 61 transitions. [2021-11-21 00:13:51,833 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-21 00:13:51,834 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:13:51,834 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:13:51,834 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-11-21 00:13:51,834 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 19 more)] === [2021-11-21 00:13:51,835 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:13:51,835 INFO L85 PathProgramCache]: Analyzing trace with hash 1381066582, now seen corresponding path program 1 times [2021-11-21 00:13:51,835 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:13:51,835 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [946916767] [2021-11-21 00:13:51,835 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:13:51,835 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:13:51,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:13:51,910 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-21 00:13:51,910 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:13:51,910 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [946916767] [2021-11-21 00:13:51,910 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [946916767] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:13:51,911 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [138976027] [2021-11-21 00:13:51,911 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:13:51,911 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:13:51,911 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:13:51,912 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:13:51,931 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-21 00:13:51,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:13:51,962 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-21 00:13:51,963 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:13:52,091 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 00:13:52,091 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:13:52,162 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 29 [2021-11-21 00:13:52,318 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 00:13:52,318 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [138976027] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:13:52,318 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1575975029] [2021-11-21 00:13:52,323 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-21 00:13:52,323 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:13:52,324 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:13:52,324 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:13:52,324 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:13:53,080 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-21 00:13:53,080 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 15 [2021-11-21 00:13:53,106 INFO L354 Elim1Store]: treesize reduction 23, result has 17.9 percent of original size [2021-11-21 00:13:53,110 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 21 [2021-11-21 00:13:53,187 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-21 00:13:53,387 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 25 [2021-11-21 00:13:53,536 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:53,553 INFO L354 Elim1Store]: treesize reduction 60, result has 13.0 percent of original size [2021-11-21 00:13:53,553 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 147 treesize of output 143 [2021-11-21 00:13:53,854 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 00:13:53,976 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 00:13:54,475 INFO L354 Elim1Store]: treesize reduction 50, result has 19.4 percent of original size [2021-11-21 00:13:54,476 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 41 treesize of output 40 [2021-11-21 00:13:54,625 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:54,684 INFO L354 Elim1Store]: treesize reduction 116, result has 37.3 percent of original size [2021-11-21 00:13:54,685 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 102 treesize of output 151 [2021-11-21 00:13:56,047 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 00:13:56,150 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 00:13:56,544 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:13:57,415 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [1575975029] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:13:57,415 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:13:57,415 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [5, 5, 5] total 23 [2021-11-21 00:13:57,416 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1405351804] [2021-11-21 00:13:57,416 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:13:57,417 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-21 00:13:57,417 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:13:57,417 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-21 00:13:57,417 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=507, Unknown=0, NotChecked=0, Total=600 [2021-11-21 00:13:57,418 INFO L87 Difference]: Start difference. First operand 57 states and 61 transitions. Second operand has 11 states, 10 states have (on average 1.4) internal successors, (14), 10 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:57,636 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:13:57,637 INFO L93 Difference]: Finished difference Result 56 states and 60 transitions. [2021-11-21 00:13:57,637 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-21 00:13:57,637 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 1.4) internal successors, (14), 10 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2021-11-21 00:13:57,637 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:13:57,638 INFO L225 Difference]: With dead ends: 56 [2021-11-21 00:13:57,638 INFO L226 Difference]: Without dead ends: 56 [2021-11-21 00:13:57,639 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 216 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=99, Invalid=551, Unknown=0, NotChecked=0, Total=650 [2021-11-21 00:13:57,639 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 4 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 82 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 99 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 82 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 10 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:13:57,640 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4 Valid, 37 Invalid, 99 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 82 Invalid, 0 Unknown, 10 Unchecked, 0.1s Time] [2021-11-21 00:13:57,640 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-11-21 00:13:57,641 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2021-11-21 00:13:57,642 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 52 states have (on average 1.1538461538461537) internal successors, (60), 55 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:57,642 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 60 transitions. [2021-11-21 00:13:57,642 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 60 transitions. Word has length 17 [2021-11-21 00:13:57,642 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:13:57,642 INFO L470 AbstractCegarLoop]: Abstraction has 56 states and 60 transitions. [2021-11-21 00:13:57,643 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 1.4) internal successors, (14), 10 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:57,643 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 60 transitions. [2021-11-21 00:13:57,643 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-11-21 00:13:57,643 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:13:57,643 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:13:57,681 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-21 00:13:57,844 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-21 00:13:57,844 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr21ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 19 more)] === [2021-11-21 00:13:57,844 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:13:57,844 INFO L85 PathProgramCache]: Analyzing trace with hash -1774348491, now seen corresponding path program 1 times [2021-11-21 00:13:57,845 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:13:57,845 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1980300887] [2021-11-21 00:13:57,845 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:13:57,845 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:13:57,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:13:57,900 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 00:13:57,901 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:13:57,901 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1980300887] [2021-11-21 00:13:57,901 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1980300887] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:13:57,901 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:13:57,901 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-21 00:13:57,902 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [418169212] [2021-11-21 00:13:57,902 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:13:57,902 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 00:13:57,902 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:13:57,903 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 00:13:57,903 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-21 00:13:57,903 INFO L87 Difference]: Start difference. First operand 56 states and 60 transitions. Second operand has 5 states, 4 states have (on average 4.5) internal successors, (18), 5 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:57,936 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:13:57,937 INFO L93 Difference]: Finished difference Result 55 states and 59 transitions. [2021-11-21 00:13:57,937 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 00:13:57,937 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 4.5) internal successors, (18), 5 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2021-11-21 00:13:57,938 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:13:57,938 INFO L225 Difference]: With dead ends: 55 [2021-11-21 00:13:57,938 INFO L226 Difference]: Without dead ends: 55 [2021-11-21 00:13:57,939 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:13:57,939 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 25 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 39 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:13:57,940 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [25 Valid, 31 Invalid, 39 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:13:57,940 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-11-21 00:13:57,944 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2021-11-21 00:13:57,944 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 52 states have (on average 1.1346153846153846) internal successors, (59), 54 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:57,944 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 59 transitions. [2021-11-21 00:13:57,945 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 59 transitions. Word has length 18 [2021-11-21 00:13:57,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:13:57,945 INFO L470 AbstractCegarLoop]: Abstraction has 55 states and 59 transitions. [2021-11-21 00:13:57,945 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 4.5) internal successors, (18), 5 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:57,945 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 59 transitions. [2021-11-21 00:13:57,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-11-21 00:13:57,946 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:13:57,947 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:13:57,947 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-11-21 00:13:57,947 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 19 more)] === [2021-11-21 00:13:57,947 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:13:57,947 INFO L85 PathProgramCache]: Analyzing trace with hash 1379264435, now seen corresponding path program 1 times [2021-11-21 00:13:57,948 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:13:57,948 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1694064369] [2021-11-21 00:13:57,948 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:13:57,948 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:13:57,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:13:58,023 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-21 00:13:58,023 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:13:58,023 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1694064369] [2021-11-21 00:13:58,024 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1694064369] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:13:58,024 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2106558457] [2021-11-21 00:13:58,024 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:13:58,024 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:13:58,024 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:13:58,027 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:13:58,050 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-21 00:13:58,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:13:58,081 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-21 00:13:58,082 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:13:58,173 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-21 00:13:58,173 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:13:58,224 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-21 00:13:58,225 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2106558457] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:13:58,225 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1461979844] [2021-11-21 00:13:58,237 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-21 00:13:58,237 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:13:58,237 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:13:58,238 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:13:58,238 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:13:58,862 INFO L354 Elim1Store]: treesize reduction 23, result has 17.9 percent of original size [2021-11-21 00:13:58,862 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 21 [2021-11-21 00:13:58,883 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2021-11-21 00:13:58,954 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-21 00:13:59,063 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 25 [2021-11-21 00:13:59,203 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:59,216 INFO L354 Elim1Store]: treesize reduction 60, result has 13.0 percent of original size [2021-11-21 00:13:59,216 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 147 treesize of output 143 [2021-11-21 00:13:59,482 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 00:13:59,559 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 00:14:00,028 INFO L354 Elim1Store]: treesize reduction 50, result has 19.4 percent of original size [2021-11-21 00:14:00,029 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 41 treesize of output 40 [2021-11-21 00:14:00,159 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:14:00,232 INFO L354 Elim1Store]: treesize reduction 116, result has 37.3 percent of original size [2021-11-21 00:14:00,232 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 102 treesize of output 151 [2021-11-21 00:14:01,881 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 00:14:01,965 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 00:14:02,032 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:14:02,570 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:14:02,571 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:14:02,571 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 12 [2021-11-21 00:14:02,571 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2014234358] [2021-11-21 00:14:02,571 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:14:02,571 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-21 00:14:02,571 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:14:02,572 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-21 00:14:02,572 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=334, Unknown=0, NotChecked=0, Total=420 [2021-11-21 00:14:02,573 INFO L87 Difference]: Start difference. First operand 55 states and 59 transitions. Second operand has 13 states, 13 states have (on average 2.230769230769231) internal successors, (29), 12 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:14:02,800 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:14:02,801 INFO L93 Difference]: Finished difference Result 107 states and 109 transitions. [2021-11-21 00:14:02,801 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-21 00:14:02,801 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.230769230769231) internal successors, (29), 12 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2021-11-21 00:14:02,801 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:14:02,802 INFO L225 Difference]: With dead ends: 107 [2021-11-21 00:14:02,802 INFO L226 Difference]: Without dead ends: 107 [2021-11-21 00:14:02,803 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 39 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 182 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=149, Invalid=553, Unknown=0, NotChecked=0, Total=702 [2021-11-21 00:14:02,803 INFO L933 BasicCegarLoop]: 43 mSDtfsCounter, 169 mSDsluCounter, 218 mSDsCounter, 0 mSdLazyCounter, 203 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 169 SdHoareTripleChecker+Valid, 261 SdHoareTripleChecker+Invalid, 234 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 203 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:14:02,804 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [169 Valid, 261 Invalid, 234 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 203 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:14:02,804 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2021-11-21 00:14:02,805 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 58. [2021-11-21 00:14:02,806 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 55 states have (on average 1.1272727272727272) internal successors, (62), 57 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:14:02,806 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 62 transitions. [2021-11-21 00:14:02,806 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 62 transitions. Word has length 18 [2021-11-21 00:14:02,806 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:14:02,807 INFO L470 AbstractCegarLoop]: Abstraction has 58 states and 62 transitions. [2021-11-21 00:14:02,807 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.230769230769231) internal successors, (29), 12 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:14:02,807 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 62 transitions. [2021-11-21 00:14:02,807 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-21 00:14:02,807 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:14:02,807 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:14:02,844 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-21 00:14:03,008 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:14:03,008 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr22ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 19 more)] === [2021-11-21 00:14:03,008 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:14:03,008 INFO L85 PathProgramCache]: Analyzing trace with hash -46879464, now seen corresponding path program 1 times [2021-11-21 00:14:03,008 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:14:03,009 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [440900747] [2021-11-21 00:14:03,009 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:14:03,009 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:14:03,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:14:03,159 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 00:14:03,160 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:14:03,160 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [440900747] [2021-11-21 00:14:03,160 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [440900747] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:14:03,160 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:14:03,160 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-21 00:14:03,160 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1082347646] [2021-11-21 00:14:03,160 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:14:03,160 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-21 00:14:03,160 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:14:03,161 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-21 00:14:03,161 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:14:03,161 INFO L87 Difference]: Start difference. First operand 58 states and 62 transitions. Second operand has 6 states, 5 states have (on average 4.0) internal successors, (20), 5 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:14:03,237 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:14:03,237 INFO L93 Difference]: Finished difference Result 57 states and 61 transitions. [2021-11-21 00:14:03,237 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-21 00:14:03,237 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 4.0) internal successors, (20), 5 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-11-21 00:14:03,237 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:14:03,238 INFO L225 Difference]: With dead ends: 57 [2021-11-21 00:14:03,238 INFO L226 Difference]: Without dead ends: 40 [2021-11-21 00:14:03,238 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2021-11-21 00:14:03,239 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 13 mSDsluCounter, 35 mSDsCounter, 0 mSdLazyCounter, 57 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 63 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 57 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:14:03,240 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 41 Invalid, 63 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 57 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:14:03,240 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-11-21 00:14:03,241 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2021-11-21 00:14:03,241 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 38 states have (on average 1.131578947368421) internal successors, (43), 39 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:14:03,242 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 43 transitions. [2021-11-21 00:14:03,242 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 43 transitions. Word has length 20 [2021-11-21 00:14:03,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:14:03,242 INFO L470 AbstractCegarLoop]: Abstraction has 40 states and 43 transitions. [2021-11-21 00:14:03,242 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 4.0) internal successors, (20), 5 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:14:03,243 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 43 transitions. [2021-11-21 00:14:03,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-21 00:14:03,243 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:14:03,243 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:14:03,243 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2021-11-21 00:14:03,244 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 19 more)] === [2021-11-21 00:14:03,244 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:14:03,244 INFO L85 PathProgramCache]: Analyzing trace with hash 1093576142, now seen corresponding path program 2 times [2021-11-21 00:14:03,244 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:14:03,244 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1720782954] [2021-11-21 00:14:03,245 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:14:03,245 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:14:03,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:14:03,362 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-21 00:14:03,362 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:14:03,362 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1720782954] [2021-11-21 00:14:03,363 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1720782954] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:14:03,363 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1401986412] [2021-11-21 00:14:03,363 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:14:03,363 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:14:03,363 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:14:03,364 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:14:03,393 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-21 00:14:03,421 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-21 00:14:03,421 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:14:03,422 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-21 00:14:03,423 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:14:03,452 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-21 00:14:03,452 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 15 [2021-11-21 00:14:03,607 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-21 00:14:03,607 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:14:03,851 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-21 00:14:03,851 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1401986412] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:14:03,851 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1077458769] [2021-11-21 00:14:03,853 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-21 00:14:03,853 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:14:03,853 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:14:03,854 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:14:03,854 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:14:04,383 INFO L354 Elim1Store]: treesize reduction 23, result has 17.9 percent of original size [2021-11-21 00:14:04,384 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 21 [2021-11-21 00:14:04,409 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2021-11-21 00:14:04,473 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-21 00:14:04,558 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 18 [2021-11-21 00:14:04,711 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:14:04,728 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-21 00:14:04,729 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 138 treesize of output 142 [2021-11-21 00:14:05,151 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 00:14:05,242 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 00:14:05,506 INFO L354 Elim1Store]: treesize reduction 40, result has 23.1 percent of original size [2021-11-21 00:14:05,506 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 36 treesize of output 35 [2021-11-21 00:14:05,712 INFO L354 Elim1Store]: treesize reduction 90, result has 56.7 percent of original size [2021-11-21 00:14:05,713 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 104 treesize of output 195 [2021-11-21 00:14:19,154 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 00:14:19,254 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 00:14:19,298 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:14:19,896 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:14:19,897 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:14:19,897 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 5, 5] total 17 [2021-11-21 00:14:19,897 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1145835540] [2021-11-21 00:14:19,897 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:14:19,897 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-21 00:14:19,898 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:14:19,898 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-21 00:14:19,898 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=561, Unknown=0, NotChecked=0, Total=650 [2021-11-21 00:14:19,899 INFO L87 Difference]: Start difference. First operand 40 states and 43 transitions. Second operand has 18 states, 17 states have (on average 2.235294117647059) internal successors, (38), 18 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:14:20,212 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:14:20,212 INFO L93 Difference]: Finished difference Result 47 states and 49 transitions. [2021-11-21 00:14:20,212 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-21 00:14:20,212 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 2.235294117647059) internal successors, (38), 18 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-11-21 00:14:20,212 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:14:20,213 INFO L225 Difference]: With dead ends: 47 [2021-11-21 00:14:20,213 INFO L226 Difference]: Without dead ends: 47 [2021-11-21 00:14:20,214 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 254 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=180, Invalid=942, Unknown=0, NotChecked=0, Total=1122 [2021-11-21 00:14:20,214 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 82 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 200 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 82 SdHoareTripleChecker+Valid, 67 SdHoareTripleChecker+Invalid, 239 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 200 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:14:20,215 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [82 Valid, 67 Invalid, 239 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 200 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:14:20,215 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-11-21 00:14:20,216 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 39. [2021-11-21 00:14:20,217 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 38 states have (on average 1.105263157894737) internal successors, (42), 38 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:14:20,217 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 42 transitions. [2021-11-21 00:14:20,217 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 42 transitions. Word has length 20 [2021-11-21 00:14:20,217 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:14:20,217 INFO L470 AbstractCegarLoop]: Abstraction has 39 states and 42 transitions. [2021-11-21 00:14:20,218 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 2.235294117647059) internal successors, (38), 18 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:14:20,218 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 42 transitions. [2021-11-21 00:14:20,218 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-21 00:14:20,218 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:14:20,219 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:14:20,240 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2021-11-21 00:14:20,422 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:14:20,423 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr13ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 19 more)] === [2021-11-21 00:14:20,423 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:14:20,423 INFO L85 PathProgramCache]: Analyzing trace with hash -832281042, now seen corresponding path program 1 times [2021-11-21 00:14:20,423 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:14:20,423 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [979012142] [2021-11-21 00:14:20,423 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:14:20,423 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:14:20,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:14:20,776 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:14:20,776 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:14:20,776 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [979012142] [2021-11-21 00:14:20,777 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [979012142] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:14:20,777 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1997829876] [2021-11-21 00:14:20,777 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:14:20,777 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:14:20,777 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:14:20,777 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:14:20,782 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-21 00:14:20,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:14:20,824 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-21 00:14:20,825 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:14:20,854 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-21 00:14:20,887 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-21 00:14:20,938 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-11-21 00:14:21,008 INFO L354 Elim1Store]: treesize reduction 84, result has 18.4 percent of original size [2021-11-21 00:14:21,008 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 38 treesize of output 40 [2021-11-21 00:14:21,204 INFO L354 Elim1Store]: treesize reduction 120, result has 16.1 percent of original size [2021-11-21 00:14:21,205 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 45 treesize of output 50 [2021-11-21 00:14:21,447 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:14:21,448 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:14:21,468 INFO L354 Elim1Store]: treesize reduction 171, result has 3.9 percent of original size [2021-11-21 00:14:21,468 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 1 disjoint index pairs (out of 15 index pairs), introduced 7 new quantified variables, introduced 15 case distinctions, treesize of input 85 treesize of output 40 [2021-11-21 00:14:21,508 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:14:21,508 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:14:30,627 INFO L354 Elim1Store]: treesize reduction 115, result has 22.3 percent of original size [2021-11-21 00:14:30,627 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 3 case distinctions, treesize of input 94 treesize of output 57 [2021-11-21 00:14:30,639 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-21 00:14:30,640 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 57 treesize of output 71 [2021-11-21 00:14:30,684 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 4 [2021-11-21 00:14:30,719 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:14:30,727 INFO L354 Elim1Store]: treesize reduction 10, result has 33.3 percent of original size [2021-11-21 00:14:30,727 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 41 treesize of output 31 [2021-11-21 00:14:30,760 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:14:30,799 INFO L354 Elim1Store]: treesize reduction 9, result has 76.9 percent of original size [2021-11-21 00:14:30,799 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 47 treesize of output 59 [2021-11-21 00:14:30,937 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:14:31,017 INFO L354 Elim1Store]: treesize reduction 27, result has 80.9 percent of original size [2021-11-21 00:14:31,017 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 157 treesize of output 224 [2021-11-21 00:14:31,898 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 5 refuted. 2 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:14:31,898 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1997829876] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:14:31,898 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [324468182] [2021-11-21 00:14:31,900 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-21 00:14:31,900 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:14:31,900 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:14:31,901 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:14:31,901 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:14:32,405 INFO L354 Elim1Store]: treesize reduction 23, result has 17.9 percent of original size [2021-11-21 00:14:32,405 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 21 [2021-11-21 00:14:32,425 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2021-11-21 00:14:32,477 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-21 00:14:32,589 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 23 [2021-11-21 00:14:32,760 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:14:32,771 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-21 00:14:32,772 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 126 treesize of output 124 [2021-11-21 00:14:32,874 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 00:14:32,960 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-21 00:14:33,064 INFO L354 Elim1Store]: treesize reduction 21, result has 38.2 percent of original size [2021-11-21 00:14:33,064 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 41 treesize of output 46 [2021-11-21 00:14:33,142 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 00:14:33,398 INFO L354 Elim1Store]: treesize reduction 10, result has 64.3 percent of original size [2021-11-21 00:14:33,399 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 21 treesize of output 33 [2021-11-21 00:14:33,558 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:14:34,399 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:14:34,399 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:14:34,399 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 30 [2021-11-21 00:14:34,399 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [79150243] [2021-11-21 00:14:34,399 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:14:34,400 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-11-21 00:14:34,400 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:14:34,400 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-11-21 00:14:34,401 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=219, Invalid=1663, Unknown=10, NotChecked=0, Total=1892 [2021-11-21 00:14:34,401 INFO L87 Difference]: Start difference. First operand 39 states and 42 transitions. Second operand has 31 states, 31 states have (on average 1.8387096774193548) internal successors, (57), 30 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:14:34,936 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:14:34,937 INFO L93 Difference]: Finished difference Result 42 states and 44 transitions. [2021-11-21 00:14:34,937 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-21 00:14:34,938 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.8387096774193548) internal successors, (57), 30 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-11-21 00:14:34,938 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:14:34,938 INFO L225 Difference]: With dead ends: 42 [2021-11-21 00:14:34,938 INFO L226 Difference]: Without dead ends: 29 [2021-11-21 00:14:34,939 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 36 SyntacticMatches, 2 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 805 ImplicationChecksByTransitivity, 10.7s TimeCoverageRelationStatistics Valid=346, Invalid=2506, Unknown=10, NotChecked=0, Total=2862 [2021-11-21 00:14:34,940 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 48 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 121 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 79 SdHoareTripleChecker+Invalid, 178 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 121 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 29 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:14:34,940 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 79 Invalid, 178 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 121 Invalid, 0 Unknown, 29 Unchecked, 0.1s Time] [2021-11-21 00:14:34,940 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-11-21 00:14:34,941 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2021-11-21 00:14:34,941 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 28 states have (on average 1.1071428571428572) internal successors, (31), 28 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:14:34,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2021-11-21 00:14:34,941 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 22 [2021-11-21 00:14:34,942 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:14:34,942 INFO L470 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2021-11-21 00:14:34,942 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 1.8387096774193548) internal successors, (57), 30 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:14:34,942 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2021-11-21 00:14:34,943 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-21 00:14:34,943 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:14:34,943 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:14:34,968 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-21 00:14:35,158 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:14:35,158 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr13ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 19 more)] === [2021-11-21 00:14:35,159 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:14:35,159 INFO L85 PathProgramCache]: Analyzing trace with hash -1839345449, now seen corresponding path program 2 times [2021-11-21 00:14:35,159 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:14:35,159 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [711861873] [2021-11-21 00:14:35,159 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:14:35,159 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:14:35,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:14:35,596 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 2 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:14:35,596 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:14:35,596 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [711861873] [2021-11-21 00:14:35,596 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [711861873] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:14:35,596 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1317805627] [2021-11-21 00:14:35,596 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:14:35,597 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:14:35,597 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:14:35,597 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:14:35,598 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-21 00:14:35,644 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-21 00:14:35,645 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:14:35,646 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-21 00:14:35,647 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:14:35,679 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-21 00:14:35,724 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-21 00:14:35,765 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-11-21 00:14:35,842 INFO L354 Elim1Store]: treesize reduction 37, result has 22.9 percent of original size [2021-11-21 00:14:35,842 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 34 treesize of output 36 [2021-11-21 00:14:35,912 INFO L354 Elim1Store]: treesize reduction 84, result has 18.4 percent of original size [2021-11-21 00:14:35,912 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 38 treesize of output 40 [2021-11-21 00:14:36,095 INFO L354 Elim1Store]: treesize reduction 120, result has 16.1 percent of original size [2021-11-21 00:14:36,096 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 45 treesize of output 50 [2021-11-21 00:14:36,232 INFO L354 Elim1Store]: treesize reduction 216, result has 14.6 percent of original size [2021-11-21 00:14:36,233 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 10 case distinctions, treesize of input 64 treesize of output 72 [2021-11-21 00:14:36,535 INFO L354 Elim1Store]: treesize reduction 202, result has 1.5 percent of original size [2021-11-21 00:14:36,535 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 1 disjoint index pairs (out of 15 index pairs), introduced 7 new quantified variables, introduced 15 case distinctions, treesize of input 102 treesize of output 44 [2021-11-21 00:14:36,568 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 10 proven. 7 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-21 00:14:36,569 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:14:40,160 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-21 00:14:40,161 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 63 treesize of output 55 [2021-11-21 00:14:40,166 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-21 00:14:40,167 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 55 treesize of output 57 [2021-11-21 00:14:40,185 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 4 [2021-11-21 00:14:40,209 INFO L354 Elim1Store]: treesize reduction 14, result has 64.1 percent of original size [2021-11-21 00:14:40,209 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 295 treesize of output 273 [2021-11-21 00:14:40,335 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-21 00:14:40,336 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1317805627] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:14:40,336 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1032518896] [2021-11-21 00:14:40,337 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-21 00:14:40,338 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:14:40,338 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:14:40,338 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:14:40,338 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:14:40,931 INFO L354 Elim1Store]: treesize reduction 23, result has 17.9 percent of original size [2021-11-21 00:14:40,932 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 21 [2021-11-21 00:14:40,954 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2021-11-21 00:14:41,006 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-21 00:14:41,079 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 23 [2021-11-21 00:14:41,285 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:14:41,296 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-21 00:14:41,296 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 126 treesize of output 124 [2021-11-21 00:14:41,416 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 00:14:41,483 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-21 00:14:41,585 INFO L354 Elim1Store]: treesize reduction 21, result has 38.2 percent of original size [2021-11-21 00:14:41,586 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 41 treesize of output 46 [2021-11-21 00:14:41,660 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 00:14:41,907 INFO L354 Elim1Store]: treesize reduction 10, result has 64.3 percent of original size [2021-11-21 00:14:41,908 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 21 treesize of output 33 [2021-11-21 00:14:42,065 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:14:42,939 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:14:42,939 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:14:42,940 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14, 11] total 36 [2021-11-21 00:14:42,940 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1915722022] [2021-11-21 00:14:42,940 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:14:42,940 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-11-21 00:14:42,940 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:14:42,941 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-11-21 00:14:42,942 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=266, Invalid=2083, Unknown=3, NotChecked=0, Total=2352 [2021-11-21 00:14:42,942 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand has 36 states, 36 states have (on average 1.7777777777777777) internal successors, (64), 36 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:14:45,164 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:14:45,165 INFO L93 Difference]: Finished difference Result 54 states and 59 transitions. [2021-11-21 00:14:45,165 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-21 00:14:45,165 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 1.7777777777777777) internal successors, (64), 36 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2021-11-21 00:14:45,165 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:14:45,165 INFO L225 Difference]: With dead ends: 54 [2021-11-21 00:14:45,166 INFO L226 Difference]: Without dead ends: 45 [2021-11-21 00:14:45,167 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 49 SyntacticMatches, 8 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1368 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=495, Invalid=3661, Unknown=4, NotChecked=0, Total=4160 [2021-11-21 00:14:45,167 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 23 mSDsluCounter, 99 mSDsCounter, 0 mSdLazyCounter, 133 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 108 SdHoareTripleChecker+Invalid, 209 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 133 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 50 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:14:45,167 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 108 Invalid, 209 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 133 Invalid, 0 Unknown, 50 Unchecked, 0.1s Time] [2021-11-21 00:14:45,168 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-11-21 00:14:45,168 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 35. [2021-11-21 00:14:45,169 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 34 states have (on average 1.088235294117647) internal successors, (37), 34 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:14:45,169 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2021-11-21 00:14:45,169 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 28 [2021-11-21 00:14:45,169 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:14:45,169 INFO L470 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2021-11-21 00:14:45,170 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 1.7777777777777777) internal successors, (64), 36 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:14:45,170 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2021-11-21 00:14:45,170 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-21 00:14:45,170 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:14:45,171 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:14:45,209 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-21 00:14:45,386 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-11-21 00:14:45,386 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr13ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 19 more)] === [2021-11-21 00:14:45,387 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:14:45,387 INFO L85 PathProgramCache]: Analyzing trace with hash 860477584, now seen corresponding path program 3 times [2021-11-21 00:14:45,387 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:14:45,387 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1042017851] [2021-11-21 00:14:45,387 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:14:45,387 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:14:45,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:14:45,467 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 18 proven. 13 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-21 00:14:45,467 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:14:45,467 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1042017851] [2021-11-21 00:14:45,467 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1042017851] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:14:45,467 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [770022865] [2021-11-21 00:14:45,468 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:14:45,468 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:14:45,468 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:14:45,469 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:14:45,474 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-21 00:14:45,522 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:14:45,522 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:14:45,523 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-21 00:14:45,524 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:14:45,639 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 19 proven. 9 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-21 00:14:45,639 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:14:45,712 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 19 proven. 9 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-21 00:14:45,712 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [770022865] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:14:45,712 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [489520309] [2021-11-21 00:14:45,715 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-21 00:14:45,715 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:14:45,715 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:14:45,716 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:14:45,716 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:14:46,179 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-21 00:14:46,179 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 15 [2021-11-21 00:14:46,198 INFO L354 Elim1Store]: treesize reduction 23, result has 17.9 percent of original size [2021-11-21 00:14:46,198 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 21 [2021-11-21 00:14:46,238 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-21 00:14:46,348 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 25 [2021-11-21 00:14:46,508 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:14:46,519 INFO L354 Elim1Store]: treesize reduction 60, result has 13.0 percent of original size [2021-11-21 00:14:46,520 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 142 treesize of output 138 [2021-11-21 00:14:46,636 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 00:14:46,694 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 00:14:46,791 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:14:46,792 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 38 [2021-11-21 00:14:46,856 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 00:14:47,070 INFO L354 Elim1Store]: treesize reduction 10, result has 64.3 percent of original size [2021-11-21 00:14:47,070 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 21 treesize of output 33 [2021-11-21 00:14:47,228 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:14:47,945 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:14:47,945 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:14:47,946 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 18 [2021-11-21 00:14:47,946 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1799642563] [2021-11-21 00:14:47,946 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:14:47,946 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-21 00:14:47,946 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:14:47,946 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-21 00:14:47,947 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=133, Invalid=797, Unknown=0, NotChecked=0, Total=930 [2021-11-21 00:14:47,947 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand has 18 states, 18 states have (on average 2.9444444444444446) internal successors, (53), 18 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:14:48,080 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:14:48,080 INFO L93 Difference]: Finished difference Result 54 states and 57 transitions. [2021-11-21 00:14:48,080 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-21 00:14:48,080 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.9444444444444446) internal successors, (53), 18 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 34 [2021-11-21 00:14:48,080 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:14:48,081 INFO L225 Difference]: With dead ends: 54 [2021-11-21 00:14:48,081 INFO L226 Difference]: Without dead ends: 40 [2021-11-21 00:14:48,082 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 73 SyntacticMatches, 7 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 463 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=165, Invalid=957, Unknown=0, NotChecked=0, Total=1122 [2021-11-21 00:14:48,082 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 39 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 138 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 172 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 138 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:14:48,082 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [39 Valid, 58 Invalid, 172 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 138 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:14:48,083 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-11-21 00:14:48,084 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2021-11-21 00:14:48,084 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 38 states have (on average 1.0789473684210527) internal successors, (41), 38 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:14:48,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 41 transitions. [2021-11-21 00:14:48,084 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 41 transitions. Word has length 34 [2021-11-21 00:14:48,084 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:14:48,085 INFO L470 AbstractCegarLoop]: Abstraction has 39 states and 41 transitions. [2021-11-21 00:14:48,085 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 2.9444444444444446) internal successors, (53), 18 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:14:48,085 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 41 transitions. [2021-11-21 00:14:48,085 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-11-21 00:14:48,086 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:14:48,086 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:14:48,112 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-21 00:14:48,302 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-11-21 00:14:48,303 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr13ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 19 more)] === [2021-11-21 00:14:48,303 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:14:48,303 INFO L85 PathProgramCache]: Analyzing trace with hash 660035110, now seen corresponding path program 4 times [2021-11-21 00:14:48,303 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:14:48,303 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1617994900] [2021-11-21 00:14:48,303 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:14:48,303 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:14:48,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:14:48,406 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 18 proven. 19 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-21 00:14:48,406 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:14:48,406 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1617994900] [2021-11-21 00:14:48,407 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1617994900] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:14:48,407 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [436106033] [2021-11-21 00:14:48,407 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:14:48,407 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:14:48,407 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:14:48,409 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:14:48,410 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-21 00:14:48,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:14:48,453 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-21 00:14:48,455 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:14:48,576 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 23 proven. 12 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-21 00:14:48,576 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:14:48,679 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 23 proven. 12 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-21 00:14:48,680 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [436106033] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:14:48,680 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1460077636] [2021-11-21 00:14:48,682 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-21 00:14:48,682 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:14:48,682 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:14:48,682 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:14:48,683 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:14:49,174 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-21 00:14:49,175 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 15 [2021-11-21 00:14:49,193 INFO L354 Elim1Store]: treesize reduction 23, result has 17.9 percent of original size [2021-11-21 00:14:49,193 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 21 [2021-11-21 00:14:49,258 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-21 00:14:49,340 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 23 [2021-11-21 00:14:49,498 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:14:49,510 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-21 00:14:49,510 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 126 treesize of output 124 [2021-11-21 00:14:49,631 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 00:14:49,720 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-21 00:14:49,832 INFO L354 Elim1Store]: treesize reduction 21, result has 38.2 percent of original size [2021-11-21 00:14:49,832 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 41 treesize of output 46 [2021-11-21 00:14:49,933 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 00:14:50,199 INFO L354 Elim1Store]: treesize reduction 10, result has 64.3 percent of original size [2021-11-21 00:14:50,200 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 21 treesize of output 33 [2021-11-21 00:14:50,314 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:14:50,905 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:14:50,905 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:14:50,905 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 9] total 16 [2021-11-21 00:14:50,906 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [235725706] [2021-11-21 00:14:50,906 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:14:50,906 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-21 00:14:50,906 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:14:50,906 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-21 00:14:50,907 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=728, Unknown=0, NotChecked=0, Total=870 [2021-11-21 00:14:50,907 INFO L87 Difference]: Start difference. First operand 39 states and 41 transitions. Second operand has 17 states, 17 states have (on average 2.823529411764706) internal successors, (48), 16 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:14:50,973 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:14:50,974 INFO L93 Difference]: Finished difference Result 59 states and 61 transitions. [2021-11-21 00:14:50,978 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-21 00:14:50,978 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.823529411764706) internal successors, (48), 16 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 38 [2021-11-21 00:14:50,978 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:14:50,979 INFO L225 Difference]: With dead ends: 59 [2021-11-21 00:14:50,979 INFO L226 Difference]: Without dead ends: 41 [2021-11-21 00:14:50,979 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 93 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 316 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=154, Invalid=776, Unknown=0, NotChecked=0, Total=930 [2021-11-21 00:14:50,980 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 32 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 103 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 127 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 103 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:14:50,980 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 26 Invalid, 127 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 103 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:14:50,980 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-11-21 00:14:50,981 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2021-11-21 00:14:50,981 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 40 states have (on average 1.075) internal successors, (43), 40 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:14:50,982 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 43 transitions. [2021-11-21 00:14:50,982 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 43 transitions. Word has length 38 [2021-11-21 00:14:50,982 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:14:50,982 INFO L470 AbstractCegarLoop]: Abstraction has 41 states and 43 transitions. [2021-11-21 00:14:50,982 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.823529411764706) internal successors, (48), 16 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:14:50,983 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 43 transitions. [2021-11-21 00:14:50,983 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-21 00:14:50,983 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:14:50,983 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:14:51,005 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-21 00:14:51,190 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-11-21 00:14:51,190 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr13ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 19 more)] === [2021-11-21 00:14:51,191 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:14:51,191 INFO L85 PathProgramCache]: Analyzing trace with hash 125712609, now seen corresponding path program 5 times [2021-11-21 00:14:51,191 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:14:51,191 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [664656826] [2021-11-21 00:14:51,191 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:14:51,191 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:14:51,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:14:51,286 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 12 proven. 24 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-21 00:14:51,286 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:14:51,286 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [664656826] [2021-11-21 00:14:51,287 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [664656826] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:14:51,287 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [240431293] [2021-11-21 00:14:51,287 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:14:51,287 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:14:51,287 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:14:51,288 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:14:51,291 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-21 00:14:51,347 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-21 00:14:51,347 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:14:51,348 INFO L263 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-21 00:14:51,349 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:14:51,489 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 20 proven. 16 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-21 00:14:51,489 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:14:51,569 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 20 proven. 16 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-21 00:14:51,570 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [240431293] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:14:51,570 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [738352775] [2021-11-21 00:14:51,571 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-21 00:14:51,572 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:14:51,572 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:14:51,572 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:14:51,572 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:14:52,055 INFO L354 Elim1Store]: treesize reduction 23, result has 17.9 percent of original size [2021-11-21 00:14:52,055 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 21 [2021-11-21 00:14:52,073 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2021-11-21 00:14:52,116 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-21 00:14:52,247 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 18 [2021-11-21 00:14:52,422 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:14:52,441 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-21 00:14:52,442 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 127 treesize of output 131 [2021-11-21 00:14:52,638 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 00:14:52,740 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 00:14:52,795 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:14:52,796 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 45 [2021-11-21 00:14:52,862 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 00:14:53,078 INFO L354 Elim1Store]: treesize reduction 10, result has 64.3 percent of original size [2021-11-21 00:14:53,078 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 21 treesize of output 33 [2021-11-21 00:14:53,239 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:14:53,790 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:14:53,790 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:14:53,790 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 18 [2021-11-21 00:14:53,790 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [891449052] [2021-11-21 00:14:53,790 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:14:53,791 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-21 00:14:53,791 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:14:53,791 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-21 00:14:53,792 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=182, Invalid=810, Unknown=0, NotChecked=0, Total=992 [2021-11-21 00:14:53,792 INFO L87 Difference]: Start difference. First operand 41 states and 43 transitions. Second operand has 19 states, 19 states have (on average 2.526315789473684) internal successors, (48), 18 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:14:53,918 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:14:53,918 INFO L93 Difference]: Finished difference Result 45 states and 47 transitions. [2021-11-21 00:14:53,918 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-21 00:14:53,918 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.526315789473684) internal successors, (48), 18 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 40 [2021-11-21 00:14:53,918 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:14:53,919 INFO L225 Difference]: With dead ends: 45 [2021-11-21 00:14:53,919 INFO L226 Difference]: Without dead ends: 45 [2021-11-21 00:14:53,919 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 97 SyntacticMatches, 2 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 492 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=228, Invalid=962, Unknown=0, NotChecked=0, Total=1190 [2021-11-21 00:14:53,920 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 90 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 80 mSolverCounterSat, 64 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 90 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 144 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 64 IncrementalHoareTripleChecker+Valid, 80 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:14:53,920 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [90 Valid, 48 Invalid, 144 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [64 Valid, 80 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:14:53,920 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-11-21 00:14:53,921 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 43. [2021-11-21 00:14:53,921 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 42 states have (on average 1.0714285714285714) internal successors, (45), 42 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:14:53,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 45 transitions. [2021-11-21 00:14:53,922 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 45 transitions. Word has length 40 [2021-11-21 00:14:53,922 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:14:53,922 INFO L470 AbstractCegarLoop]: Abstraction has 43 states and 45 transitions. [2021-11-21 00:14:53,922 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 2.526315789473684) internal successors, (48), 18 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:14:53,922 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 45 transitions. [2021-11-21 00:14:53,922 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-21 00:14:53,922 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:14:53,923 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:14:53,944 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-21 00:14:54,126 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-11-21 00:14:54,126 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr13ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 19 more)] === [2021-11-21 00:14:54,127 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:14:54,127 INFO L85 PathProgramCache]: Analyzing trace with hash 1603178684, now seen corresponding path program 6 times [2021-11-21 00:14:54,127 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:14:54,127 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1354114632] [2021-11-21 00:14:54,127 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:14:54,128 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:14:54,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:14:54,231 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 18 proven. 27 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-21 00:14:54,232 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:14:54,232 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1354114632] [2021-11-21 00:14:54,232 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1354114632] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:14:54,232 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [66643301] [2021-11-21 00:14:54,232 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:14:54,233 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:14:54,233 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:14:54,234 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:14:54,244 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-21 00:14:54,284 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:14:54,284 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:14:54,285 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-21 00:14:54,287 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:14:54,478 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 25 proven. 25 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-21 00:14:54,478 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:14:54,559 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 25 proven. 25 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-21 00:14:54,560 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [66643301] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:14:54,560 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1712386654] [2021-11-21 00:14:54,561 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-21 00:14:54,561 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:14:54,562 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:14:54,562 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:14:54,562 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:14:55,066 INFO L354 Elim1Store]: treesize reduction 23, result has 17.9 percent of original size [2021-11-21 00:14:55,067 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 21 [2021-11-21 00:14:55,081 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2021-11-21 00:14:55,118 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-21 00:14:55,241 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 23 [2021-11-21 00:14:55,451 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:14:55,464 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-21 00:14:55,465 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 126 treesize of output 124 [2021-11-21 00:14:55,582 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 00:14:55,669 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-21 00:14:55,755 INFO L354 Elim1Store]: treesize reduction 21, result has 38.2 percent of original size [2021-11-21 00:14:55,755 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 41 treesize of output 46 [2021-11-21 00:14:55,863 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 00:14:56,145 INFO L354 Elim1Store]: treesize reduction 10, result has 64.3 percent of original size [2021-11-21 00:14:56,145 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 21 treesize of output 33 [2021-11-21 00:14:56,306 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:14:56,984 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:14:56,984 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:14:56,984 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 13, 13] total 24 [2021-11-21 00:14:56,984 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [968799674] [2021-11-21 00:14:56,984 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:14:56,984 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-21 00:14:56,985 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:14:56,985 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-21 00:14:56,986 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=1139, Unknown=0, NotChecked=0, Total=1332 [2021-11-21 00:14:56,986 INFO L87 Difference]: Start difference. First operand 43 states and 45 transitions. Second operand has 24 states, 24 states have (on average 2.625) internal successors, (63), 24 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:14:57,184 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:14:57,184 INFO L93 Difference]: Finished difference Result 81 states and 85 transitions. [2021-11-21 00:14:57,190 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-21 00:14:57,191 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.625) internal successors, (63), 24 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 42 [2021-11-21 00:14:57,191 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:14:57,191 INFO L225 Difference]: With dead ends: 81 [2021-11-21 00:14:57,192 INFO L226 Difference]: Without dead ends: 59 [2021-11-21 00:14:57,192 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 99 SyntacticMatches, 1 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 549 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=272, Invalid=1534, Unknown=0, NotChecked=0, Total=1806 [2021-11-21 00:14:57,193 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 68 mSDsluCounter, 63 mSDsCounter, 0 mSdLazyCounter, 264 mSolverCounterSat, 52 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 68 SdHoareTripleChecker+Valid, 68 SdHoareTripleChecker+Invalid, 316 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 52 IncrementalHoareTripleChecker+Valid, 264 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:14:57,194 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [68 Valid, 68 Invalid, 316 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [52 Valid, 264 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:14:57,194 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-11-21 00:14:57,195 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 47. [2021-11-21 00:14:57,195 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 46 states have (on average 1.065217391304348) internal successors, (49), 46 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:14:57,196 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 49 transitions. [2021-11-21 00:14:57,196 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 49 transitions. Word has length 42 [2021-11-21 00:14:57,196 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:14:57,196 INFO L470 AbstractCegarLoop]: Abstraction has 47 states and 49 transitions. [2021-11-21 00:14:57,196 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 2.625) internal successors, (63), 24 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:14:57,197 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 49 transitions. [2021-11-21 00:14:57,197 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-21 00:14:57,197 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:14:57,197 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:14:57,232 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-21 00:14:57,410 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-11-21 00:14:57,410 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr13ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 19 more)] === [2021-11-21 00:14:57,411 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:14:57,411 INFO L85 PathProgramCache]: Analyzing trace with hash -2062874542, now seen corresponding path program 7 times [2021-11-21 00:14:57,411 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:14:57,411 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1759228748] [2021-11-21 00:14:57,411 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:14:57,411 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:14:57,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:14:58,248 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 12 proven. 79 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:14:58,248 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:14:58,248 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1759228748] [2021-11-21 00:14:58,248 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1759228748] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:14:58,248 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1703166177] [2021-11-21 00:14:58,248 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:14:58,249 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:14:58,249 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:14:58,249 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:14:58,250 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-21 00:14:58,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:14:58,300 INFO L263 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 47 conjunts are in the unsatisfiable core [2021-11-21 00:14:58,302 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:14:58,430 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-21 00:14:58,474 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-21 00:14:58,527 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-11-21 00:14:58,606 INFO L354 Elim1Store]: treesize reduction 37, result has 22.9 percent of original size [2021-11-21 00:14:58,606 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 34 treesize of output 36 [2021-11-21 00:14:58,676 INFO L354 Elim1Store]: treesize reduction 37, result has 22.9 percent of original size [2021-11-21 00:14:58,676 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 34 treesize of output 36 [2021-11-21 00:14:58,756 INFO L354 Elim1Store]: treesize reduction 37, result has 22.9 percent of original size [2021-11-21 00:14:58,756 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 34 treesize of output 36 [2021-11-21 00:14:58,829 INFO L354 Elim1Store]: treesize reduction 37, result has 22.9 percent of original size [2021-11-21 00:14:58,829 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 34 treesize of output 36 [2021-11-21 00:14:58,919 INFO L354 Elim1Store]: treesize reduction 84, result has 18.4 percent of original size [2021-11-21 00:14:58,920 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 38 treesize of output 40 [2021-11-21 00:14:59,116 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:14:59,131 INFO L354 Elim1Store]: treesize reduction 140, result has 14.1 percent of original size [2021-11-21 00:14:59,131 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 50 treesize of output 55 [2021-11-21 00:14:59,273 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:14:59,274 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:14:59,290 INFO L354 Elim1Store]: treesize reduction 160, result has 12.6 percent of original size [2021-11-21 00:14:59,290 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 8 case distinctions, treesize of input 54 treesize of output 62 [2021-11-21 00:14:59,427 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:14:59,428 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:14:59,428 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:14:59,430 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:14:59,430 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:14:59,449 INFO L354 Elim1Store]: treesize reduction 196, result has 10.5 percent of original size [2021-11-21 00:14:59,449 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 6 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 12 case distinctions, treesize of input 63 treesize of output 74 [2021-11-21 00:14:59,596 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:14:59,597 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:14:59,597 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:14:59,598 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:14:59,599 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:14:59,599 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:14:59,600 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:14:59,600 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:14:59,601 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:14:59,622 INFO L354 Elim1Store]: treesize reduction 244, result has 8.6 percent of original size [2021-11-21 00:14:59,622 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 17 case distinctions, treesize of input 75 treesize of output 89 [2021-11-21 00:14:59,797 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:14:59,798 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:14:59,800 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:14:59,800 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:14:59,801 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:14:59,802 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:14:59,803 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:14:59,803 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:14:59,804 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:14:59,805 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:14:59,805 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:14:59,806 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:14:59,807 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:14:59,808 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:14:59,833 INFO L354 Elim1Store]: treesize reduction 268, result has 7.9 percent of original size [2021-11-21 00:14:59,834 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 7 select indices, 7 select index equivalence classes, 15 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 23 case distinctions, treesize of input 81 treesize of output 98 [2021-11-21 00:15:00,186 INFO L354 Elim1Store]: treesize reduction 286, result has 1.0 percent of original size [2021-11-21 00:15:00,187 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 9 select indices, 9 select index equivalence classes, 15 disjoint index pairs (out of 36 index pairs), introduced 10 new quantified variables, introduced 36 case distinctions, treesize of input 119 treesize of output 45 [2021-11-21 00:15:00,229 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 10 proven. 61 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-21 00:15:00,229 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:16:52,792 INFO L354 Elim1Store]: treesize reduction 1173, result has 6.5 percent of original size [2021-11-21 00:16:52,793 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 7 case distinctions, treesize of input 190 treesize of output 145 [2021-11-21 00:16:52,808 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-21 00:16:52,809 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 145 treesize of output 151 [2021-11-21 00:16:52,923 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 4 [2021-11-21 00:16:53,024 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:16:53,025 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:16:53,025 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:16:53,026 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:16:53,027 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:16:53,085 INFO L354 Elim1Store]: treesize reduction 9, result has 76.9 percent of original size [2021-11-21 00:16:53,085 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 973 treesize of output 865 [2021-11-21 00:16:53,734 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:16:53,735 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:16:53,735 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:16:53,736 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:16:53,736 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:16:53,754 INFO L354 Elim1Store]: treesize reduction 10, result has 33.3 percent of original size [2021-11-21 00:16:53,754 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 967 treesize of output 837 [2021-11-21 00:16:54,501 INFO L354 Elim1Store]: treesize reduction 255, result has 52.5 percent of original size [2021-11-21 00:16:54,502 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 9 select indices, 9 select index equivalence classes, 0 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 36 case distinctions, treesize of input 10680 treesize of output 10217 [2021-11-21 00:17:13,326 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 12 proven. 61 refuted. 18 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:17:13,327 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1703166177] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:17:13,327 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2015698779] [2021-11-21 00:17:13,329 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-21 00:17:13,329 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:17:13,329 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:17:13,329 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:17:13,330 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:17:14,007 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-21 00:17:14,007 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 15 [2021-11-21 00:17:14,045 INFO L354 Elim1Store]: treesize reduction 23, result has 17.9 percent of original size [2021-11-21 00:17:14,045 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 21 [2021-11-21 00:17:14,108 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-21 00:17:14,260 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 25 [2021-11-21 00:17:14,505 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:14,520 INFO L354 Elim1Store]: treesize reduction 60, result has 13.0 percent of original size [2021-11-21 00:17:14,521 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 142 treesize of output 138 [2021-11-21 00:17:14,682 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 00:17:14,759 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 00:17:14,898 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:14,898 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 38 [2021-11-21 00:17:15,000 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 00:17:15,350 INFO L354 Elim1Store]: treesize reduction 10, result has 64.3 percent of original size [2021-11-21 00:17:15,350 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 21 treesize of output 33 [2021-11-21 00:17:15,567 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:17:17,468 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:17:17,468 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:17:17,468 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 19, 23] total 63 [2021-11-21 00:17:17,468 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1987799137] [2021-11-21 00:17:17,468 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:17:17,469 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 64 states [2021-11-21 00:17:17,469 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:17:17,469 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2021-11-21 00:17:17,472 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=464, Invalid=5341, Unknown=47, NotChecked=0, Total=5852 [2021-11-21 00:17:17,472 INFO L87 Difference]: Start difference. First operand 47 states and 49 transitions. Second operand has 64 states, 64 states have (on average 1.890625) internal successors, (121), 63 states have internal predecessors, (121), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:17:24,295 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:17:24,295 INFO L93 Difference]: Finished difference Result 91 states and 99 transitions. [2021-11-21 00:17:24,296 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-11-21 00:17:24,297 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 64 states have (on average 1.890625) internal successors, (121), 63 states have internal predecessors, (121), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 46 [2021-11-21 00:17:24,297 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:17:24,298 INFO L225 Difference]: With dead ends: 91 [2021-11-21 00:17:24,298 INFO L226 Difference]: Without dead ends: 85 [2021-11-21 00:17:24,302 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 204 GetRequests, 85 SyntacticMatches, 12 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4203 ImplicationChecksByTransitivity, 126.3s TimeCoverageRelationStatistics Valid=1090, Invalid=10633, Unknown=49, NotChecked=0, Total=11772 [2021-11-21 00:17:24,303 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 115 mSDsluCounter, 253 mSDsCounter, 0 mSdLazyCounter, 330 mSolverCounterSat, 89 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 115 SdHoareTripleChecker+Valid, 264 SdHoareTripleChecker+Invalid, 524 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 89 IncrementalHoareTripleChecker+Valid, 330 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 105 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:17:24,303 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [115 Valid, 264 Invalid, 524 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [89 Valid, 330 Invalid, 0 Unknown, 105 Unchecked, 0.3s Time] [2021-11-21 00:17:24,304 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2021-11-21 00:17:24,306 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 76. [2021-11-21 00:17:24,307 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 75 states have (on average 1.0666666666666667) internal successors, (80), 75 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:17:24,307 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 80 transitions. [2021-11-21 00:17:24,307 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 80 transitions. Word has length 46 [2021-11-21 00:17:24,308 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:17:24,308 INFO L470 AbstractCegarLoop]: Abstraction has 76 states and 80 transitions. [2021-11-21 00:17:24,318 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 64 states, 64 states have (on average 1.890625) internal successors, (121), 63 states have internal predecessors, (121), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:17:24,318 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 80 transitions. [2021-11-21 00:17:24,318 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-21 00:17:24,319 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:17:24,319 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:17:24,352 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-21 00:17:24,519 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:17:24,519 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr13ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 19 more)] === [2021-11-21 00:17:24,520 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:17:24,520 INFO L85 PathProgramCache]: Analyzing trace with hash -1758658547, now seen corresponding path program 8 times [2021-11-21 00:17:24,520 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:17:24,520 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2010547358] [2021-11-21 00:17:24,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:17:24,520 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:17:24,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:17:24,735 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 30 proven. 48 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-21 00:17:24,735 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:17:24,736 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2010547358] [2021-11-21 00:17:24,736 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2010547358] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:17:24,736 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1774910862] [2021-11-21 00:17:24,736 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:17:24,736 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:17:24,736 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:17:24,738 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:17:24,758 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-21 00:17:24,871 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-11-21 00:17:24,871 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:17:24,873 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-21 00:17:24,875 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:17:25,187 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 42 proven. 25 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-21 00:17:25,188 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:17:25,363 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 42 proven. 25 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-21 00:17:25,363 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1774910862] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:17:25,363 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1336490233] [2021-11-21 00:17:25,365 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-21 00:17:25,365 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:17:25,365 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:17:25,366 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:17:25,366 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:17:26,163 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-21 00:17:26,163 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 15 [2021-11-21 00:17:26,213 INFO L354 Elim1Store]: treesize reduction 23, result has 17.9 percent of original size [2021-11-21 00:17:26,214 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 21 [2021-11-21 00:17:26,252 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-21 00:17:26,451 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 20 [2021-11-21 00:17:26,721 INFO L354 Elim1Store]: treesize reduction 74, result has 23.7 percent of original size [2021-11-21 00:17:26,722 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 137 treesize of output 139 [2021-11-21 00:17:26,933 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 00:17:27,063 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 00:17:27,185 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:27,186 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 38 [2021-11-21 00:17:27,333 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 00:17:27,743 INFO L354 Elim1Store]: treesize reduction 10, result has 64.3 percent of original size [2021-11-21 00:17:27,743 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 21 treesize of output 33 [2021-11-21 00:17:27,997 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:17:28,910 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:17:28,911 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:17:28,911 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14, 14] total 23 [2021-11-21 00:17:28,911 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1979070748] [2021-11-21 00:17:28,911 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:17:28,912 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-21 00:17:28,912 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:17:28,912 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-21 00:17:28,913 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=1079, Unknown=0, NotChecked=0, Total=1332 [2021-11-21 00:17:28,914 INFO L87 Difference]: Start difference. First operand 76 states and 80 transitions. Second operand has 24 states, 24 states have (on average 2.9166666666666665) internal successors, (70), 23 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:17:29,269 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:17:29,270 INFO L93 Difference]: Finished difference Result 100 states and 104 transitions. [2021-11-21 00:17:29,270 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-21 00:17:29,270 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.9166666666666665) internal successors, (70), 23 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 48 [2021-11-21 00:17:29,270 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:17:29,271 INFO L225 Difference]: With dead ends: 100 [2021-11-21 00:17:29,271 INFO L226 Difference]: Without dead ends: 100 [2021-11-21 00:17:29,272 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 114 SyntacticMatches, 8 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 974 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=408, Invalid=1572, Unknown=0, NotChecked=0, Total=1980 [2021-11-21 00:17:29,272 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 185 mSDsluCounter, 70 mSDsCounter, 0 mSdLazyCounter, 199 mSolverCounterSat, 79 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 185 SdHoareTripleChecker+Valid, 83 SdHoareTripleChecker+Invalid, 278 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 79 IncrementalHoareTripleChecker+Valid, 199 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:17:29,273 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [185 Valid, 83 Invalid, 278 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [79 Valid, 199 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 00:17:29,274 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2021-11-21 00:17:29,275 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 78. [2021-11-21 00:17:29,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 77 states have (on average 1.0649350649350648) internal successors, (82), 77 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:17:29,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 82 transitions. [2021-11-21 00:17:29,277 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 82 transitions. Word has length 48 [2021-11-21 00:17:29,277 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:17:29,277 INFO L470 AbstractCegarLoop]: Abstraction has 78 states and 82 transitions. [2021-11-21 00:17:29,277 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 2.9166666666666665) internal successors, (70), 23 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:17:29,277 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 82 transitions. [2021-11-21 00:17:29,278 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-21 00:17:29,278 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:17:29,279 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 7, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:17:29,314 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-21 00:17:29,494 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-11-21 00:17:29,495 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr13ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 19 more)] === [2021-11-21 00:17:29,495 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:17:29,495 INFO L85 PathProgramCache]: Analyzing trace with hash 931002363, now seen corresponding path program 9 times [2021-11-21 00:17:29,495 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:17:29,495 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2143135004] [2021-11-21 00:17:29,495 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:17:29,495 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:17:29,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:17:31,160 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 20 proven. 107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:17:31,160 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:17:31,162 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2143135004] [2021-11-21 00:17:31,162 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2143135004] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:17:31,162 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1166090108] [2021-11-21 00:17:31,163 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:17:31,163 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:17:31,163 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:17:31,164 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:17:31,166 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-21 00:17:31,222 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:17:31,222 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:17:31,225 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 57 conjunts are in the unsatisfiable core [2021-11-21 00:17:31,227 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:17:31,259 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-21 00:17:31,320 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-21 00:17:31,381 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 18 [2021-11-21 00:17:31,467 INFO L354 Elim1Store]: treesize reduction 21, result has 25.0 percent of original size [2021-11-21 00:17:31,467 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 30 [2021-11-21 00:17:31,579 INFO L354 Elim1Store]: treesize reduction 68, result has 20.0 percent of original size [2021-11-21 00:17:31,579 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 40 treesize of output 45 [2021-11-21 00:17:31,717 INFO L354 Elim1Store]: treesize reduction 137, result has 17.5 percent of original size [2021-11-21 00:17:31,718 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 52 treesize of output 60 [2021-11-21 00:17:31,879 INFO L354 Elim1Store]: treesize reduction 164, result has 17.6 percent of original size [2021-11-21 00:17:31,879 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 1 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 55 treesize of output 66 [2021-11-21 00:17:32,073 INFO L354 Elim1Store]: treesize reduction 236, result has 15.7 percent of original size [2021-11-21 00:17:32,073 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 6 select indices, 6 select index equivalence classes, 1 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 64 treesize of output 78 [2021-11-21 00:17:32,429 INFO L354 Elim1Store]: treesize reduction 430, result has 12.2 percent of original size [2021-11-21 00:17:32,430 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 7 select indices, 7 select index equivalence classes, 0 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 28 case distinctions, treesize of input 77 treesize of output 94 [2021-11-21 00:17:34,810 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:34,936 INFO L354 Elim1Store]: treesize reduction 610, result has 9.2 percent of original size [2021-11-21 00:17:34,937 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 1 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 35 case distinctions, treesize of input 89 treesize of output 109 [2021-11-21 00:17:35,188 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:35,189 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:35,363 INFO L354 Elim1Store]: treesize reduction 664, result has 8.5 percent of original size [2021-11-21 00:17:35,363 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 9 select indices, 9 select index equivalence classes, 3 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 43 case distinctions, treesize of input 93 treesize of output 116 [2021-11-21 00:17:35,625 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:35,626 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:35,627 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:35,630 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:35,631 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:35,815 INFO L354 Elim1Store]: treesize reduction 774, result has 7.4 percent of original size [2021-11-21 00:17:35,815 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 6 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 52 case distinctions, treesize of input 102 treesize of output 128 [2021-11-21 00:17:36,115 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:36,116 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:36,117 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:36,118 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:36,119 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:36,122 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:36,123 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:36,124 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:36,124 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:36,330 INFO L354 Elim1Store]: treesize reduction 926, result has 6.3 percent of original size [2021-11-21 00:17:36,331 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 11 select indices, 11 select index equivalence classes, 10 disjoint index pairs (out of 55 index pairs), introduced 11 new quantified variables, introduced 62 case distinctions, treesize of input 114 treesize of output 143 [2021-11-21 00:17:36,641 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:36,642 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:36,643 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:36,644 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:36,645 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:36,646 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:36,647 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:36,648 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:36,649 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:36,650 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:36,651 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:36,652 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:36,653 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:36,654 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:36,897 INFO L354 Elim1Store]: treesize reduction 1057, result has 5.5 percent of original size [2021-11-21 00:17:36,898 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 12 select indices, 12 select index equivalence classes, 15 disjoint index pairs (out of 66 index pairs), introduced 12 new quantified variables, introduced 73 case distinctions, treesize of input 126 treesize of output 158 [2021-11-21 00:17:37,256 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:37,257 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:37,258 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:37,259 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:37,260 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:37,261 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:37,262 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:37,263 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:37,264 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:37,265 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:37,265 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:37,267 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:37,268 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:37,268 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:37,269 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:37,270 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:37,271 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:37,272 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:37,273 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:37,284 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:37,555 INFO L354 Elim1Store]: treesize reduction 1104, result has 5.3 percent of original size [2021-11-21 00:17:37,555 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 13 select indices, 13 select index equivalence classes, 21 disjoint index pairs (out of 78 index pairs), introduced 13 new quantified variables, introduced 85 case distinctions, treesize of input 129 treesize of output 164 [2021-11-21 00:17:37,982 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:37,982 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:37,983 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:37,984 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:37,985 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:37,985 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:37,986 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:37,987 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:37,987 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:37,988 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:37,989 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:37,989 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:37,990 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:37,991 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:37,992 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:37,992 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:37,993 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:37,993 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:17:37,994 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:37,995 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:37,995 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:37,996 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:37,997 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:37,997 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:38,234 INFO L354 Elim1Store]: treesize reduction 1261, result has 0.6 percent of original size [2021-11-21 00:17:38,235 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 16 select indices, 16 select index equivalence classes, 21 disjoint index pairs (out of 120 index pairs), introduced 17 new quantified variables, introduced 120 case distinctions, treesize of input 239 treesize of output 70 [2021-11-21 00:17:38,311 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 0 proven. 85 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-21 00:17:38,312 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:17:47,101 INFO L354 Elim1Store]: treesize reduction 1190, result has 6.1 percent of original size [2021-11-21 00:17:47,101 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 8 case distinctions, treesize of input 189 treesize of output 157 [2021-11-21 00:17:47,118 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-21 00:17:47,119 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 237 treesize of output 199 [2021-11-21 00:17:47,146 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:17:47,147 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:17:47,147 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:17:47,148 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:17:47,149 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:17:47,150 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:47,151 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:17:47,151 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:17:47,152 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:17:47,152 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:17:47,153 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:17:47,154 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:17:47,157 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 5 [2021-11-21 00:17:47,251 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 6 [2021-11-21 00:17:47,267 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:17:47,268 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:17:47,269 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:17:47,269 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:17:47,269 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:17:47,270 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:17:47,270 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:17:47,271 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:17:47,271 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:17:47,272 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:17:47,272 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:17:47,273 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:47,281 INFO L354 Elim1Store]: treesize reduction 5, result has 50.0 percent of original size [2021-11-21 00:17:47,281 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 17 [2021-11-21 00:17:47,338 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 6 [2021-11-21 00:17:47,389 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:17:47,390 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:17:47,391 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:17:47,391 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:17:47,392 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:17:47,392 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:17:47,694 INFO L354 Elim1Store]: treesize reduction 262, result has 46.2 percent of original size [2021-11-21 00:17:47,695 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 10 select indices, 10 select index equivalence classes, 0 disjoint index pairs (out of 45 index pairs), introduced 11 new quantified variables, introduced 45 case distinctions, treesize of input 2457 treesize of output 1999 [2021-11-21 00:17:47,721 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: BigInteger out of long range [2021-11-21 00:17:47,722 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1842348334] [2021-11-21 00:17:47,723 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-21 00:17:47,723 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:17:47,723 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:17:47,724 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:17:47,724 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:17:48,330 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-21 00:17:48,331 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 15 [2021-11-21 00:17:48,372 INFO L354 Elim1Store]: treesize reduction 23, result has 17.9 percent of original size [2021-11-21 00:17:48,372 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 21 [2021-11-21 00:17:48,446 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-21 00:17:48,540 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 20 [2021-11-21 00:17:48,798 INFO L354 Elim1Store]: treesize reduction 74, result has 23.7 percent of original size [2021-11-21 00:17:48,799 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 137 treesize of output 139 [2021-11-21 00:17:48,940 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 00:17:49,011 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-21 00:17:49,100 INFO L354 Elim1Store]: treesize reduction 21, result has 38.2 percent of original size [2021-11-21 00:17:49,100 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 54 treesize of output 59 [2021-11-21 00:17:49,231 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 00:17:49,519 INFO L354 Elim1Store]: treesize reduction 10, result has 64.3 percent of original size [2021-11-21 00:17:49,519 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 21 treesize of output 33 [2021-11-21 00:17:49,686 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:17:51,226 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:17:51,227 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:17:51,227 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2021-11-21 00:17:51,227 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1191021040] [2021-11-21 00:17:51,227 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-21 00:17:51,228 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-21 00:17:51,228 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:17:51,228 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-21 00:17:51,230 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=565, Invalid=5754, Unknown=1, NotChecked=0, Total=6320 [2021-11-21 00:17:51,230 INFO L87 Difference]: Start difference. First operand 78 states and 82 transitions. Second operand has 29 states, 29 states have (on average 1.793103448275862) internal successors, (52), 28 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:17:54,097 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:17:54,097 INFO L93 Difference]: Finished difference Result 137 states and 143 transitions. [2021-11-21 00:17:54,097 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-21 00:17:54,097 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.793103448275862) internal successors, (52), 28 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 52 [2021-11-21 00:17:54,098 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:17:54,098 INFO L225 Difference]: With dead ends: 137 [2021-11-21 00:17:54,098 INFO L226 Difference]: Without dead ends: 101 [2021-11-21 00:17:54,101 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 187 GetRequests, 89 SyntacticMatches, 0 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2255 ImplicationChecksByTransitivity, 16.0s TimeCoverageRelationStatistics Valid=938, Invalid=8961, Unknown=1, NotChecked=0, Total=9900 [2021-11-21 00:17:54,102 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 165 mSDsluCounter, 192 mSDsCounter, 0 mSdLazyCounter, 888 mSolverCounterSat, 110 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 165 SdHoareTripleChecker+Valid, 210 SdHoareTripleChecker+Invalid, 998 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 110 IncrementalHoareTripleChecker+Valid, 888 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-21 00:17:54,102 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [165 Valid, 210 Invalid, 998 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [110 Valid, 888 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-21 00:17:54,102 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2021-11-21 00:17:54,104 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 80. [2021-11-21 00:17:54,104 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 79 states have (on average 1.0632911392405062) internal successors, (84), 79 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:17:54,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 84 transitions. [2021-11-21 00:17:54,105 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 84 transitions. Word has length 52 [2021-11-21 00:17:54,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:17:54,105 INFO L470 AbstractCegarLoop]: Abstraction has 80 states and 84 transitions. [2021-11-21 00:17:54,105 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.793103448275862) internal successors, (52), 28 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:17:54,105 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 84 transitions. [2021-11-21 00:17:54,106 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-21 00:17:54,106 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:17:54,106 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:17:54,128 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-21 00:17:54,318 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:17:54,319 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr13ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 19 more)] === [2021-11-21 00:17:54,319 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:17:54,319 INFO L85 PathProgramCache]: Analyzing trace with hash 876083062, now seen corresponding path program 10 times [2021-11-21 00:17:54,319 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:17:54,319 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [246643502] [2021-11-21 00:17:54,319 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:17:54,319 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:17:54,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:17:54,505 INFO L134 CoverageAnalysis]: Checked inductivity of 141 backedges. 42 proven. 63 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-21 00:17:54,505 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:17:54,505 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [246643502] [2021-11-21 00:17:54,506 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [246643502] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:17:54,506 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1993304831] [2021-11-21 00:17:54,506 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:17:54,506 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:17:54,506 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:17:54,507 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:17:54,518 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-21 00:17:54,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:17:54,579 INFO L263 TraceCheckSpWp]: Trace formula consists of 229 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-21 00:17:54,581 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:17:54,831 INFO L134 CoverageAnalysis]: Checked inductivity of 141 backedges. 56 proven. 49 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-21 00:17:54,831 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:17:54,968 INFO L134 CoverageAnalysis]: Checked inductivity of 141 backedges. 56 proven. 49 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-21 00:17:54,968 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1993304831] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:17:54,968 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [728625465] [2021-11-21 00:17:54,970 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-21 00:17:54,970 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:17:54,970 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:17:54,971 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:17:54,971 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:17:55,548 INFO L354 Elim1Store]: treesize reduction 23, result has 17.9 percent of original size [2021-11-21 00:17:55,548 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 21 [2021-11-21 00:17:55,562 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2021-11-21 00:17:55,631 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-21 00:17:55,766 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 25 [2021-11-21 00:17:55,951 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:55,963 INFO L354 Elim1Store]: treesize reduction 60, result has 13.0 percent of original size [2021-11-21 00:17:55,964 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 142 treesize of output 138 [2021-11-21 00:17:56,106 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 00:17:56,189 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 00:17:56,307 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:56,308 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 38 [2021-11-21 00:17:56,367 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 00:17:56,616 INFO L354 Elim1Store]: treesize reduction 10, result has 64.3 percent of original size [2021-11-21 00:17:56,616 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 21 treesize of output 33 [2021-11-21 00:17:56,783 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:17:57,533 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:17:57,533 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:17:57,534 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 27 [2021-11-21 00:17:57,534 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1632855691] [2021-11-21 00:17:57,534 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:17:57,534 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-21 00:17:57,534 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:17:57,535 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-21 00:17:57,535 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=323, Invalid=1317, Unknown=0, NotChecked=0, Total=1640 [2021-11-21 00:17:57,535 INFO L87 Difference]: Start difference. First operand 80 states and 84 transitions. Second operand has 28 states, 28 states have (on average 2.357142857142857) internal successors, (66), 27 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:17:57,840 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:17:57,840 INFO L93 Difference]: Finished difference Result 117 states and 121 transitions. [2021-11-21 00:17:57,840 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-21 00:17:57,840 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 2.357142857142857) internal successors, (66), 27 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 54 [2021-11-21 00:17:57,841 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:17:57,841 INFO L225 Difference]: With dead ends: 117 [2021-11-21 00:17:57,841 INFO L226 Difference]: Without dead ends: 117 [2021-11-21 00:17:57,842 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 186 GetRequests, 129 SyntacticMatches, 9 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1246 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=515, Invalid=1935, Unknown=0, NotChecked=0, Total=2450 [2021-11-21 00:17:57,843 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 137 mSDsluCounter, 104 mSDsCounter, 0 mSdLazyCounter, 221 mSolverCounterSat, 71 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 137 SdHoareTripleChecker+Valid, 124 SdHoareTripleChecker+Invalid, 292 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 71 IncrementalHoareTripleChecker+Valid, 221 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:17:57,843 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [137 Valid, 124 Invalid, 292 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [71 Valid, 221 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 00:17:57,843 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2021-11-21 00:17:57,845 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 82. [2021-11-21 00:17:57,845 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 81 states have (on average 1.0617283950617284) internal successors, (86), 81 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:17:57,846 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 86 transitions. [2021-11-21 00:17:57,846 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 86 transitions. Word has length 54 [2021-11-21 00:17:57,846 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:17:57,846 INFO L470 AbstractCegarLoop]: Abstraction has 82 states and 86 transitions. [2021-11-21 00:17:57,847 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 2.357142857142857) internal successors, (66), 27 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:17:57,847 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 86 transitions. [2021-11-21 00:17:57,847 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-11-21 00:17:57,847 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:17:57,848 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 6, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:17:57,874 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-21 00:17:58,062 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:17:58,062 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr13ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 19 more)] === [2021-11-21 00:17:58,063 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:17:58,063 INFO L85 PathProgramCache]: Analyzing trace with hash 263997572, now seen corresponding path program 11 times [2021-11-21 00:17:58,063 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:17:58,063 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [112867725] [2021-11-21 00:17:58,063 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:17:58,063 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:17:58,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:17:58,257 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 102 proven. 49 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-21 00:17:58,257 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:17:58,257 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [112867725] [2021-11-21 00:17:58,257 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [112867725] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:17:58,257 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1140477299] [2021-11-21 00:17:58,257 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:17:58,257 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:17:58,258 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:17:58,263 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:17:58,278 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-21 00:17:58,439 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2021-11-21 00:17:58,439 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:17:58,441 INFO L263 TraceCheckSpWp]: Trace formula consists of 249 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-21 00:17:58,442 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:17:58,659 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 91 proven. 30 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-11-21 00:17:58,659 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:17:58,770 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 91 proven. 30 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-11-21 00:17:58,771 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1140477299] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:17:58,771 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2122481792] [2021-11-21 00:17:58,772 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-21 00:17:58,772 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:17:58,773 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:17:58,773 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:17:58,773 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:17:59,310 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-21 00:17:59,310 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 15 [2021-11-21 00:17:59,336 INFO L354 Elim1Store]: treesize reduction 23, result has 17.9 percent of original size [2021-11-21 00:17:59,337 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 21 [2021-11-21 00:17:59,375 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-21 00:17:59,468 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 20 [2021-11-21 00:17:59,674 INFO L354 Elim1Store]: treesize reduction 74, result has 23.7 percent of original size [2021-11-21 00:17:59,674 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 137 treesize of output 139 [2021-11-21 00:17:59,874 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 00:17:59,944 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-21 00:18:00,028 INFO L354 Elim1Store]: treesize reduction 21, result has 38.2 percent of original size [2021-11-21 00:18:00,028 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 54 treesize of output 59 [2021-11-21 00:18:00,129 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 00:18:00,374 INFO L354 Elim1Store]: treesize reduction 10, result has 64.3 percent of original size [2021-11-21 00:18:00,374 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 21 treesize of output 33 [2021-11-21 00:18:00,542 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:18:01,193 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:18:01,193 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:18:01,193 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 13, 13] total 26 [2021-11-21 00:18:01,193 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [343638591] [2021-11-21 00:18:01,193 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:18:01,194 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-21 00:18:01,194 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:18:01,194 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-21 00:18:01,194 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=252, Invalid=1308, Unknown=0, NotChecked=0, Total=1560 [2021-11-21 00:18:01,195 INFO L87 Difference]: Start difference. First operand 82 states and 86 transitions. Second operand has 27 states, 27 states have (on average 2.5185185185185186) internal successors, (68), 26 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:18:01,344 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:18:01,344 INFO L93 Difference]: Finished difference Result 85 states and 87 transitions. [2021-11-21 00:18:01,345 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-21 00:18:01,345 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 2.5185185185185186) internal successors, (68), 26 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 58 [2021-11-21 00:18:01,345 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:18:01,345 INFO L225 Difference]: With dead ends: 85 [2021-11-21 00:18:01,345 INFO L226 Difference]: Without dead ends: 59 [2021-11-21 00:18:01,346 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 191 GetRequests, 152 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 550 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=268, Invalid=1372, Unknown=0, NotChecked=0, Total=1640 [2021-11-21 00:18:01,346 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 39 mSDsluCounter, 70 mSDsCounter, 0 mSdLazyCounter, 306 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 77 SdHoareTripleChecker+Invalid, 330 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 306 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:18:01,346 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [39 Valid, 77 Invalid, 330 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 306 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:18:01,347 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-11-21 00:18:01,348 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2021-11-21 00:18:01,348 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 58 states have (on average 1.0517241379310345) internal successors, (61), 58 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:18:01,349 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 61 transitions. [2021-11-21 00:18:01,349 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 61 transitions. Word has length 58 [2021-11-21 00:18:01,349 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:18:01,349 INFO L470 AbstractCegarLoop]: Abstraction has 59 states and 61 transitions. [2021-11-21 00:18:01,349 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 2.5185185185185186) internal successors, (68), 26 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:18:01,349 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 61 transitions. [2021-11-21 00:18:01,350 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-11-21 00:18:01,350 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:18:01,350 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:18:01,373 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-21 00:18:01,550 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:18:01,550 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr13ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 19 more)] === [2021-11-21 00:18:01,551 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:18:01,551 INFO L85 PathProgramCache]: Analyzing trace with hash 1884025060, now seen corresponding path program 12 times [2021-11-21 00:18:01,551 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:18:01,551 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1774894739] [2021-11-21 00:18:01,551 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:18:01,551 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:18:01,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:18:02,904 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 30 proven. 139 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:18:02,905 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:18:02,905 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1774894739] [2021-11-21 00:18:02,905 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1774894739] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:18:02,905 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1247695903] [2021-11-21 00:18:02,905 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:18:02,905 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:18:02,906 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:18:02,908 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:18:02,910 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-21 00:18:02,981 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:18:02,981 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:18:02,983 INFO L263 TraceCheckSpWp]: Trace formula consists of 170 conjuncts, 62 conjunts are in the unsatisfiable core [2021-11-21 00:18:02,984 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:18:03,013 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-21 00:18:03,054 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-21 00:18:03,106 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 23 [2021-11-21 00:18:03,175 INFO L354 Elim1Store]: treesize reduction 21, result has 25.0 percent of original size [2021-11-21 00:18:03,175 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 30 [2021-11-21 00:18:03,263 INFO L354 Elim1Store]: treesize reduction 68, result has 20.0 percent of original size [2021-11-21 00:18:03,264 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 40 treesize of output 45 [2021-11-21 00:18:03,369 INFO L354 Elim1Store]: treesize reduction 137, result has 17.5 percent of original size [2021-11-21 00:18:03,370 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 52 treesize of output 60 [2021-11-21 00:18:03,491 INFO L354 Elim1Store]: treesize reduction 164, result has 17.6 percent of original size [2021-11-21 00:18:03,492 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 1 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 55 treesize of output 66 [2021-11-21 00:18:03,637 INFO L354 Elim1Store]: treesize reduction 236, result has 15.7 percent of original size [2021-11-21 00:18:03,637 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 6 select indices, 6 select index equivalence classes, 1 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 64 treesize of output 78 [2021-11-21 00:18:03,811 INFO L354 Elim1Store]: treesize reduction 320, result has 14.2 percent of original size [2021-11-21 00:18:03,811 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 7 select indices, 7 select index equivalence classes, 1 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 21 case distinctions, treesize of input 73 treesize of output 90 [2021-11-21 00:18:04,138 INFO L354 Elim1Store]: treesize reduction 540, result has 11.3 percent of original size [2021-11-21 00:18:04,139 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 36 case distinctions, treesize of input 86 treesize of output 106 [2021-11-21 00:18:06,581 INFO L354 Elim1Store]: treesize reduction 666, result has 9.6 percent of original size [2021-11-21 00:18:06,582 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 9 select indices, 9 select index equivalence classes, 1 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 44 case distinctions, treesize of input 93 treesize of output 116 [2021-11-21 00:18:06,795 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:06,796 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:06,950 INFO L354 Elim1Store]: treesize reduction 856, result has 7.7 percent of original size [2021-11-21 00:18:06,951 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 3 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 53 case distinctions, treesize of input 105 treesize of output 131 [2021-11-21 00:18:07,172 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:07,173 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:07,174 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:07,175 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:07,175 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:07,360 INFO L354 Elim1Store]: treesize reduction 1006, result has 6.6 percent of original size [2021-11-21 00:18:07,360 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 11 select indices, 11 select index equivalence classes, 6 disjoint index pairs (out of 55 index pairs), introduced 11 new quantified variables, introduced 63 case distinctions, treesize of input 117 treesize of output 146 [2021-11-21 00:18:07,628 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:07,629 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:07,629 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:07,630 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:07,631 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:07,632 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:07,632 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:07,633 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:07,634 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:07,840 INFO L354 Elim1Store]: treesize reduction 1060, result has 6.3 percent of original size [2021-11-21 00:18:07,840 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 12 select indices, 12 select index equivalence classes, 10 disjoint index pairs (out of 66 index pairs), introduced 12 new quantified variables, introduced 74 case distinctions, treesize of input 120 treesize of output 152 [2021-11-21 00:18:08,081 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:08,082 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:08,082 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:08,083 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:08,084 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:08,085 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:08,085 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:08,086 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:08,086 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:08,087 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:08,088 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:08,089 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:08,089 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:08,090 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:08,343 INFO L354 Elim1Store]: treesize reduction 1186, result has 5.6 percent of original size [2021-11-21 00:18:08,343 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 13 select indices, 13 select index equivalence classes, 15 disjoint index pairs (out of 78 index pairs), introduced 13 new quantified variables, introduced 86 case distinctions, treesize of input 129 treesize of output 164 [2021-11-21 00:18:08,604 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:08,605 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:08,605 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:08,606 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:08,607 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:08,607 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:08,608 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:08,609 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:08,610 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:08,610 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:08,611 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:08,612 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:08,612 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:08,613 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:08,614 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:08,614 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:08,615 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:08,616 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:08,616 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:08,617 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:08,893 INFO L354 Elim1Store]: treesize reduction 1312, result has 5.1 percent of original size [2021-11-21 00:18:08,893 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 14 select indices, 14 select index equivalence classes, 21 disjoint index pairs (out of 91 index pairs), introduced 14 new quantified variables, introduced 99 case distinctions, treesize of input 138 treesize of output 176 [2021-11-21 00:18:09,240 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:09,241 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:09,242 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:09,242 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:09,243 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:09,244 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:09,244 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:09,245 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:09,246 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:09,247 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:09,247 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:09,248 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:09,248 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:09,249 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:09,250 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:09,250 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:09,251 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:09,252 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:09,252 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:09,253 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:09,254 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:09,254 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:09,255 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:09,255 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:09,256 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:09,257 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:09,257 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:09,576 INFO L354 Elim1Store]: treesize reduction 1438, result has 4.7 percent of original size [2021-11-21 00:18:09,577 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 15 select indices, 15 select index equivalence classes, 28 disjoint index pairs (out of 105 index pairs), introduced 15 new quantified variables, introduced 113 case distinctions, treesize of input 147 treesize of output 188 [2021-11-21 00:18:10,390 INFO L354 Elim1Store]: treesize reduction 1374, result has 0.2 percent of original size [2021-11-21 00:18:10,390 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 17 select indices, 17 select index equivalence classes, 28 disjoint index pairs (out of 136 index pairs), introduced 18 new quantified variables, introduced 136 case distinctions, treesize of input 254 treesize of output 72 [2021-11-21 00:18:10,452 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 113 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2021-11-21 00:18:10,452 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:18:21,980 INFO L354 Elim1Store]: treesize reduction 1628, result has 5.1 percent of original size [2021-11-21 00:18:21,980 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 9 case distinctions, treesize of input 209 treesize of output 177 [2021-11-21 00:18:22,007 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-21 00:18:22,007 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 317 treesize of output 271 [2021-11-21 00:18:22,039 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-21 00:18:22,115 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:18:22,116 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:18:22,116 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:18:22,117 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:18:22,118 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:18:22,118 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:18:22,120 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:22,120 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:18:22,121 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:18:22,121 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:18:22,122 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:18:22,123 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:18:22,123 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:18:22,124 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:18:22,136 INFO L354 Elim1Store]: treesize reduction 5, result has 50.0 percent of original size [2021-11-21 00:18:22,136 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 22 treesize of output 21 [2021-11-21 00:18:22,170 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:18:22,171 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:18:22,172 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:18:22,172 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:18:22,173 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:18:22,174 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:18:22,175 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:22,176 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:18:22,176 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:18:22,177 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:18:22,177 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:18:22,178 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:18:22,179 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:18:22,179 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:18:22,184 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-21 00:18:22,715 INFO L354 Elim1Store]: treesize reduction 346, result has 42.4 percent of original size [2021-11-21 00:18:22,716 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 11 select indices, 11 select index equivalence classes, 0 disjoint index pairs (out of 55 index pairs), introduced 12 new quantified variables, introduced 55 case distinctions, treesize of input 36862 treesize of output 25987 [2021-11-21 00:18:23,464 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: BigInteger out of long range [2021-11-21 00:18:23,464 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [39328632] [2021-11-21 00:18:23,466 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-21 00:18:23,466 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:18:23,466 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:18:23,466 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:18:23,467 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:18:23,989 INFO L354 Elim1Store]: treesize reduction 23, result has 17.9 percent of original size [2021-11-21 00:18:23,990 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 21 [2021-11-21 00:18:24,009 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2021-11-21 00:18:24,084 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-21 00:18:24,193 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 18 [2021-11-21 00:18:24,352 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:18:24,372 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-21 00:18:24,373 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 127 treesize of output 131 [2021-11-21 00:18:24,572 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 00:18:24,663 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-21 00:18:24,747 INFO L354 Elim1Store]: treesize reduction 21, result has 38.2 percent of original size [2021-11-21 00:18:24,747 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 48 treesize of output 53 [2021-11-21 00:18:24,836 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 00:18:25,138 INFO L354 Elim1Store]: treesize reduction 10, result has 64.3 percent of original size [2021-11-21 00:18:25,139 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 21 treesize of output 33 [2021-11-21 00:18:25,304 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:18:27,733 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:18:27,734 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:18:27,734 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2021-11-21 00:18:27,734 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1399435014] [2021-11-21 00:18:27,734 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-21 00:18:27,734 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-21 00:18:27,734 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:18:27,734 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-21 00:18:27,735 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=565, Invalid=6744, Unknown=1, NotChecked=0, Total=7310 [2021-11-21 00:18:27,735 INFO L87 Difference]: Start difference. First operand 59 states and 61 transitions. Second operand has 32 states, 32 states have (on average 1.8125) internal successors, (58), 31 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:18:31,532 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:18:31,533 INFO L93 Difference]: Finished difference Result 101 states and 105 transitions. [2021-11-21 00:18:31,533 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-21 00:18:31,533 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.8125) internal successors, (58), 31 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 58 [2021-11-21 00:18:31,533 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:18:31,533 INFO L225 Difference]: With dead ends: 101 [2021-11-21 00:18:31,534 INFO L226 Difference]: Without dead ends: 61 [2021-11-21 00:18:31,534 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 208 GetRequests, 101 SyntacticMatches, 1 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2607 ImplicationChecksByTransitivity, 20.2s TimeCoverageRelationStatistics Valid=998, Invalid=10557, Unknown=1, NotChecked=0, Total=11556 [2021-11-21 00:18:31,535 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 193 mSDsluCounter, 144 mSDsCounter, 0 mSdLazyCounter, 817 mSolverCounterSat, 150 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 193 SdHoareTripleChecker+Valid, 157 SdHoareTripleChecker+Invalid, 967 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 150 IncrementalHoareTripleChecker+Valid, 817 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-21 00:18:31,535 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [193 Valid, 157 Invalid, 967 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [150 Valid, 817 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-21 00:18:31,535 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2021-11-21 00:18:31,536 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2021-11-21 00:18:31,536 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 60 states have (on average 1.05) internal successors, (63), 60 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:18:31,537 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 63 transitions. [2021-11-21 00:18:31,537 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 63 transitions. Word has length 58 [2021-11-21 00:18:31,537 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:18:31,537 INFO L470 AbstractCegarLoop]: Abstraction has 61 states and 63 transitions. [2021-11-21 00:18:31,537 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 1.8125) internal successors, (58), 31 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:18:31,537 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 63 transitions. [2021-11-21 00:18:31,537 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-21 00:18:31,537 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:18:31,537 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:18:31,557 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-11-21 00:18:31,738 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:18:31,738 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr13ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 19 more)] === [2021-11-21 00:18:31,738 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:18:31,738 INFO L85 PathProgramCache]: Analyzing trace with hash -35051489, now seen corresponding path program 13 times [2021-11-21 00:18:31,738 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:18:31,739 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [458037247] [2021-11-21 00:18:31,739 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:18:31,739 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:18:31,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:18:31,954 INFO L134 CoverageAnalysis]: Checked inductivity of 185 backedges. 56 proven. 80 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-11-21 00:18:31,954 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:18:31,954 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [458037247] [2021-11-21 00:18:31,954 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [458037247] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:18:31,954 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [666521421] [2021-11-21 00:18:31,954 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:18:31,954 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:18:31,954 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:18:31,955 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:18:31,956 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-21 00:18:32,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:18:32,016 INFO L263 TraceCheckSpWp]: Trace formula consists of 251 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-21 00:18:32,018 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:18:32,292 INFO L134 CoverageAnalysis]: Checked inductivity of 185 backedges. 72 proven. 64 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-11-21 00:18:32,292 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:18:32,432 INFO L134 CoverageAnalysis]: Checked inductivity of 185 backedges. 72 proven. 64 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-11-21 00:18:32,432 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [666521421] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:18:32,432 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1993306287] [2021-11-21 00:18:32,433 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-21 00:18:32,433 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:18:32,433 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:18:32,433 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:18:32,434 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:18:32,938 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-21 00:18:32,939 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 15 [2021-11-21 00:18:32,986 INFO L354 Elim1Store]: treesize reduction 23, result has 17.9 percent of original size [2021-11-21 00:18:32,987 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 21 [2021-11-21 00:18:33,045 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-21 00:18:33,158 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 25 [2021-11-21 00:18:33,306 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:33,318 INFO L354 Elim1Store]: treesize reduction 60, result has 13.0 percent of original size [2021-11-21 00:18:33,318 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 142 treesize of output 138 [2021-11-21 00:18:33,468 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 00:18:33,518 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-21 00:18:33,614 INFO L354 Elim1Store]: treesize reduction 21, result has 38.2 percent of original size [2021-11-21 00:18:33,615 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 54 treesize of output 59 [2021-11-21 00:18:33,702 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 00:18:33,959 INFO L354 Elim1Store]: treesize reduction 10, result has 64.3 percent of original size [2021-11-21 00:18:33,959 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 21 treesize of output 33 [2021-11-21 00:18:34,132 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:18:34,748 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:18:34,749 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:18:34,749 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 30 [2021-11-21 00:18:34,749 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [845103565] [2021-11-21 00:18:34,749 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:18:34,749 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-11-21 00:18:34,749 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:18:34,750 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-11-21 00:18:34,750 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=382, Invalid=1510, Unknown=0, NotChecked=0, Total=1892 [2021-11-21 00:18:34,750 INFO L87 Difference]: Start difference. First operand 61 states and 63 transitions. Second operand has 31 states, 31 states have (on average 2.3225806451612905) internal successors, (72), 30 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:18:34,917 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:18:34,917 INFO L93 Difference]: Finished difference Result 77 states and 79 transitions. [2021-11-21 00:18:34,917 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-21 00:18:34,918 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 2.3225806451612905) internal successors, (72), 30 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 60 [2021-11-21 00:18:34,918 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:18:34,918 INFO L225 Difference]: With dead ends: 77 [2021-11-21 00:18:34,918 INFO L226 Difference]: Without dead ends: 77 [2021-11-21 00:18:34,918 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 200 GetRequests, 154 SyntacticMatches, 1 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 885 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=452, Invalid=1710, Unknown=0, NotChecked=0, Total=2162 [2021-11-21 00:18:34,919 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 148 mSDsluCounter, 103 mSDsCounter, 0 mSdLazyCounter, 172 mSolverCounterSat, 80 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 148 SdHoareTripleChecker+Valid, 118 SdHoareTripleChecker+Invalid, 252 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 80 IncrementalHoareTripleChecker+Valid, 172 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:18:34,919 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [148 Valid, 118 Invalid, 252 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [80 Valid, 172 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:18:34,920 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-11-21 00:18:34,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 65. [2021-11-21 00:18:34,921 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 64 states have (on average 1.046875) internal successors, (67), 64 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:18:34,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 67 transitions. [2021-11-21 00:18:34,921 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 67 transitions. Word has length 60 [2021-11-21 00:18:34,921 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:18:34,922 INFO L470 AbstractCegarLoop]: Abstraction has 65 states and 67 transitions. [2021-11-21 00:18:34,922 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 2.3225806451612905) internal successors, (72), 30 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:18:34,922 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 67 transitions. [2021-11-21 00:18:34,922 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-21 00:18:34,923 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:18:34,923 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:18:34,944 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-11-21 00:18:35,126 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2021-11-21 00:18:35,127 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr13ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 19 more)] === [2021-11-21 00:18:35,127 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:18:35,127 INFO L85 PathProgramCache]: Analyzing trace with hash -515767539, now seen corresponding path program 14 times [2021-11-21 00:18:35,127 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:18:35,127 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1552505179] [2021-11-21 00:18:35,127 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:18:35,127 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:18:35,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:18:36,709 INFO L134 CoverageAnalysis]: Checked inductivity of 217 backedges. 42 proven. 175 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:18:36,709 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:18:36,709 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1552505179] [2021-11-21 00:18:36,709 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1552505179] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:18:36,709 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [762887898] [2021-11-21 00:18:36,709 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:18:36,709 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:18:36,710 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:18:36,710 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:18:36,711 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-11-21 00:18:36,957 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-11-21 00:18:36,957 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:18:36,959 INFO L263 TraceCheckSpWp]: Trace formula consists of 267 conjuncts, 51 conjunts are in the unsatisfiable core [2021-11-21 00:18:36,961 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:18:37,010 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-21 00:18:37,052 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-21 00:18:37,113 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 24 [2021-11-21 00:18:37,191 INFO L354 Elim1Store]: treesize reduction 37, result has 22.9 percent of original size [2021-11-21 00:18:37,191 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 36 treesize of output 38 [2021-11-21 00:18:37,272 INFO L354 Elim1Store]: treesize reduction 37, result has 22.9 percent of original size [2021-11-21 00:18:37,272 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 36 treesize of output 38 [2021-11-21 00:18:37,368 INFO L354 Elim1Store]: treesize reduction 37, result has 22.9 percent of original size [2021-11-21 00:18:37,368 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 36 treesize of output 38 [2021-11-21 00:18:37,485 INFO L354 Elim1Store]: treesize reduction 37, result has 22.9 percent of original size [2021-11-21 00:18:37,486 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 36 treesize of output 38 [2021-11-21 00:18:37,577 INFO L354 Elim1Store]: treesize reduction 37, result has 22.9 percent of original size [2021-11-21 00:18:37,578 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 36 treesize of output 38 [2021-11-21 00:18:37,661 INFO L354 Elim1Store]: treesize reduction 37, result has 22.9 percent of original size [2021-11-21 00:18:37,661 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 36 treesize of output 38 [2021-11-21 00:18:37,747 INFO L354 Elim1Store]: treesize reduction 39, result has 22.0 percent of original size [2021-11-21 00:18:37,747 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 39 [2021-11-21 00:18:40,370 INFO L354 Elim1Store]: treesize reduction 140, result has 17.6 percent of original size [2021-11-21 00:18:40,371 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 55 treesize of output 60 [2021-11-21 00:18:42,792 INFO L354 Elim1Store]: treesize reduction 240, result has 14.0 percent of original size [2021-11-21 00:18:42,792 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 10 case distinctions, treesize of input 79 treesize of output 87 [2021-11-21 00:18:43,910 INFO L354 Elim1Store]: treesize reduction 346, result has 12.6 percent of original size [2021-11-21 00:18:43,910 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 15 case distinctions, treesize of input 95 treesize of output 106 [2021-11-21 00:18:44,992 INFO L354 Elim1Store]: treesize reduction 468, result has 11.5 percent of original size [2021-11-21 00:18:44,993 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 21 case distinctions, treesize of input 111 treesize of output 125 [2021-11-21 00:18:48,682 INFO L354 Elim1Store]: treesize reduction 606, result has 10.6 percent of original size [2021-11-21 00:18:48,683 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 7 select indices, 7 select index equivalence classes, 0 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 28 case distinctions, treesize of input 122 treesize of output 139 [2021-11-21 00:18:55,846 INFO L354 Elim1Store]: treesize reduction 760, result has 9.8 percent of original size [2021-11-21 00:18:55,847 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 36 case distinctions, treesize of input 138 treesize of output 158 [2021-11-21 00:19:10,494 INFO L354 Elim1Store]: treesize reduction 930, result has 9.2 percent of original size [2021-11-21 00:19:10,494 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 9 select indices, 9 select index equivalence classes, 0 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 45 case distinctions, treesize of input 154 treesize of output 177 [2021-11-21 00:19:23,093 INFO L354 Elim1Store]: treesize reduction 930, result has 9.2 percent of original size [2021-11-21 00:19:23,093 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 9 select indices, 9 select index equivalence classes, 0 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 45 case distinctions, treesize of input 154 treesize of output 177 [2021-11-21 00:19:44,913 INFO L354 Elim1Store]: treesize reduction 930, result has 9.2 percent of original size [2021-11-21 00:19:44,913 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 9 select indices, 9 select index equivalence classes, 0 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 45 case distinctions, treesize of input 159 treesize of output 182 [2021-11-21 00:19:56,200 INFO L354 Elim1Store]: treesize reduction 854, result has 0.4 percent of original size [2021-11-21 00:19:56,201 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 11 select indices, 11 select index equivalence classes, 0 disjoint index pairs (out of 55 index pairs), introduced 12 new quantified variables, introduced 55 case distinctions, treesize of input 280 treesize of output 94 [2021-11-21 00:19:56,268 INFO L134 CoverageAnalysis]: Checked inductivity of 217 backedges. 52 proven. 47 refuted. 0 times theorem prover too weak. 118 trivial. 0 not checked. [2021-11-21 00:19:56,269 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:22:50,943 WARN L228 Executor]: External (MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1) with exit command (exit)) stderr output: (error "out of memory") [2021-11-21 00:22:50,944 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: External (MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1) with exit command (exit)) Received EOF on stdin. stderr output: (error "out of memory") [2021-11-21 00:22:50,944 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [170763269] [2021-11-21 00:22:50,945 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-21 00:22:50,945 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:22:50,945 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:22:50,945 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:22:50,946 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:22:50,948 FATAL L? ?]: Ignoring exception! de.uni_freiburg.informatik.ultimate.logic.SMTLIBException: External (MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1) with exit command (exit)) Connection to SMT solver broken at de.uni_freiburg.informatik.ultimate.smtsolver.external.Executor.convertIOException(Executor.java:312) at de.uni_freiburg.informatik.ultimate.smtsolver.external.Executor.input(Executor.java:158) at de.uni_freiburg.informatik.ultimate.smtsolver.external.Scriptor.push(Scriptor.java:132) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.arrays.DiffWrapperScript.push(DiffWrapperScript.java:90) at de.uni_freiburg.informatik.ultimate.logic.WrapperScript.push(WrapperScript.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.scripttransfer.HistoryRecordingScript.push(HistoryRecordingScript.java:107) at de.uni_freiburg.informatik.ultimate.logic.Util.checkSat(Util.java:48) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.SmtUtils.checkSatTerm(SmtUtils.java:267) at de.uni_freiburg.informatik.ultimate.lib.sifa.SymbolicTools.isFalse(SymbolicTools.java:218) at de.uni_freiburg.informatik.ultimate.lib.sifa.domain.RelationCheckUtil.isEqBottom_SolverAlphaSolver(RelationCheckUtil.java:56) at de.uni_freiburg.informatik.ultimate.lib.sifa.domain.ExplicitValueDomain.isEqBottom(ExplicitValueDomain.java:73) at de.uni_freiburg.informatik.ultimate.lib.sifa.domain.CompoundDomain.isEqBottom(CompoundDomain.java:84) at de.uni_freiburg.informatik.ultimate.lib.sifa.domain.StatsWrapperDomain.isEqBottom(StatsWrapperDomain.java:69) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.earlyExitAfterStep(DagInterpreter.java:139) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.interpret(DagInterpreter.java:125) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.interpretLoisInProcedure(IcfgInterpreter.java:136) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.interpret(IcfgInterpreter.java:127) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:102) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) 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) Caused by: java.io.IOException: Broken pipe at java.base/java.io.FileOutputStream.writeBytes(Native Method) at java.base/java.io.FileOutputStream.write(FileOutputStream.java:354) at java.base/java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:81) at java.base/java.io.BufferedOutputStream.flush(BufferedOutputStream.java:142) at java.base/sun.nio.cs.StreamEncoder.implFlush(StreamEncoder.java:318) at java.base/sun.nio.cs.StreamEncoder.flush(StreamEncoder.java:153) at java.base/java.io.OutputStreamWriter.flush(OutputStreamWriter.java:251) at java.base/java.io.BufferedWriter.flush(BufferedWriter.java:257) at de.uni_freiburg.informatik.ultimate.smtsolver.external.Executor.input(Executor.java:156) ... 45 more [2021-11-21 00:22:50,951 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:22:50,951 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2021-11-21 00:22:50,957 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1371152562] [2021-11-21 00:22:50,957 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-21 00:22:50,958 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-21 00:22:50,949 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 101 [2021-11-21 00:22:50,959 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:22:50,959 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-21 00:22:50,960 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=577, Invalid=4609, Unknown=70, NotChecked=0, Total=5256 [2021-11-21 00:22:50,961 INFO L87 Difference]: Start difference. First operand 65 states and 67 transitions. Second operand has 35 states, 35 states have (on average 1.8285714285714285) internal successors, (64), 34 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:50,962 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-21 00:22:50,963 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 45 SyntacticMatches, 9 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1819 ImplicationChecksByTransitivity, 236.7s TimeCoverageRelationStatistics Valid=577, Invalid=4609, Unknown=70, NotChecked=0, Total=5256 [2021-11-21 00:22:50,964 INFO L933 BasicCegarLoop]: 0 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 1 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:22:50,965 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 0 Invalid, 1 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:22:51,007 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2021-11-21 00:22:51,194 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2021-11-21 00:22:51,195 FATAL L? ?]: The Plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction has thrown an exception: java.lang.IllegalStateException: ManagedScript already locked by de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.MonolithicImplicationChecker@533f65f at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.ManagedScript.lock(ManagedScript.java:82) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.IncrementalHoareTripleChecker.assertCodeBlock(IncrementalHoareTripleChecker.java:359) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.IncrementalHoareTripleChecker.prepareAssertionStackAndAddTransition(IncrementalHoareTripleChecker.java:206) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.IncrementalHoareTripleChecker.checkInternal(IncrementalHoareTripleChecker.java:131) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.ChainingHoareTripleChecker$ProtectedHtc.checkInternal(ChainingHoareTripleChecker.java:436) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.ChainingHoareTripleChecker.checkInternal(ChainingHoareTripleChecker.java:98) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.CachingHoareTripleChecker.checkInternal(CachingHoareTripleChecker.java:95) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.AbstractInterpolantAutomaton$InternalSuccessorComputationHelper.computeSuccWithSolver(AbstractInterpolantAutomaton.java:357) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.BasicAbstractInterpolantAutomaton.chooseFalseSuccessor2(BasicAbstractInterpolantAutomaton.java:107) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.BasicAbstractInterpolantAutomaton.computeSuccs(BasicAbstractInterpolantAutomaton.java:73) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.BasicAbstractInterpolantAutomaton.computeSuccs(BasicAbstractInterpolantAutomaton.java:1) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.AbstractInterpolantAutomaton.internalSuccessors(AbstractInterpolantAutomaton.java:233) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.AbstractInterpolantAutomaton.internalSuccessors(AbstractInterpolantAutomaton.java:1) at de.uni_freiburg.informatik.ultimate.automata.nestedword.operations.TotalizeNwa.internalSuccessors(TotalizeNwa.java:213) at de.uni_freiburg.informatik.ultimate.automata.nestedword.operations.ComplementDeterministicNwa.internalSuccessors(ComplementDeterministicNwa.java:121) at de.uni_freiburg.informatik.ultimate.automata.nestedword.operations.ProductNwa.internalSuccessors(ProductNwa.java:216) at de.uni_freiburg.informatik.ultimate.automata.nestedword.operations.ProductNwa.internalSuccessors(ProductNwa.java:208) at de.uni_freiburg.informatik.ultimate.automata.nestedword.reachablestates.NestedWordAutomatonReachableStates$ReachableStatesComputation.addInternalsAndSuccessors(NestedWordAutomatonReachableStates.java:1058) at de.uni_freiburg.informatik.ultimate.automata.nestedword.reachablestates.NestedWordAutomatonReachableStates$ReachableStatesComputation.(NestedWordAutomatonReachableStates.java:960) at de.uni_freiburg.informatik.ultimate.automata.nestedword.reachablestates.NestedWordAutomatonReachableStates.(NestedWordAutomatonReachableStates.java:182) at de.uni_freiburg.informatik.ultimate.automata.nestedword.operations.Difference.computeDifference(Difference.java:137) at de.uni_freiburg.informatik.ultimate.automata.nestedword.operations.Difference.(Difference.java:90) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.computeAutomataDifference(BasicCegarLoop.java:868) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.refineAbstraction(BasicCegarLoop.java:784) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.refineAbstractionInternal(AbstractCegarLoop.java:462) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:420) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) 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) [2021-11-21 00:22:51,197 INFO L158 Benchmark]: Toolchain (without parser) took 552606.42ms. Allocated memory was 98.6MB in the beginning and 209.7MB in the end (delta: 111.1MB). Free memory was 57.4MB in the beginning and 53.4MB in the end (delta: 4.0MB). Peak memory consumption was 114.3MB. Max. memory is 16.1GB. [2021-11-21 00:22:51,197 INFO L158 Benchmark]: CDTParser took 0.33ms. Allocated memory is still 98.6MB. Free memory is still 75.3MB. There was no memory consumed. Max. memory is 16.1GB. [2021-11-21 00:22:51,197 INFO L158 Benchmark]: CACSL2BoogieTranslator took 466.28ms. Allocated memory is still 98.6MB. Free memory was 57.2MB in the beginning and 66.5MB in the end (delta: -9.3MB). Peak memory consumption was 6.3MB. Max. memory is 16.1GB. [2021-11-21 00:22:51,197 INFO L158 Benchmark]: Boogie Procedure Inliner took 81.13ms. Allocated memory is still 98.6MB. Free memory was 66.5MB in the beginning and 64.6MB in the end (delta: 1.8MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-11-21 00:22:51,197 INFO L158 Benchmark]: Boogie Preprocessor took 59.12ms. Allocated memory is still 98.6MB. Free memory was 64.3MB in the beginning and 63.2MB in the end (delta: 1.2MB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-21 00:22:51,198 INFO L158 Benchmark]: RCFGBuilder took 396.44ms. Allocated memory is still 98.6MB. Free memory was 63.2MB in the beginning and 49.4MB in the end (delta: 13.8MB). Peak memory consumption was 14.7MB. Max. memory is 16.1GB. [2021-11-21 00:22:51,198 INFO L158 Benchmark]: TraceAbstraction took 551597.20ms. Allocated memory was 98.6MB in the beginning and 209.7MB in the end (delta: 111.1MB). Free memory was 48.9MB in the beginning and 53.4MB in the end (delta: -4.5MB). Peak memory consumption was 108.2MB. Max. memory is 16.1GB. [2021-11-21 00:22:51,199 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.33ms. Allocated memory is still 98.6MB. Free memory is still 75.3MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 466.28ms. Allocated memory is still 98.6MB. Free memory was 57.2MB in the beginning and 66.5MB in the end (delta: -9.3MB). Peak memory consumption was 6.3MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 81.13ms. Allocated memory is still 98.6MB. Free memory was 66.5MB in the beginning and 64.6MB in the end (delta: 1.8MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Boogie Preprocessor took 59.12ms. Allocated memory is still 98.6MB. Free memory was 64.3MB in the beginning and 63.2MB in the end (delta: 1.2MB). There was no memory consumed. Max. memory is 16.1GB. * RCFGBuilder took 396.44ms. Allocated memory is still 98.6MB. Free memory was 63.2MB in the beginning and 49.4MB in the end (delta: 13.8MB). Peak memory consumption was 14.7MB. Max. memory is 16.1GB. * TraceAbstraction took 551597.20ms. Allocated memory was 98.6MB in the beginning and 209.7MB in the end (delta: 111.1MB). Free memory was 48.9MB in the beginning and 53.4MB in the end (delta: -4.5MB). Peak memory consumption was 108.2MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - ExceptionOrErrorResult: IllegalStateException: ManagedScript already locked by de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.MonolithicImplicationChecker@533f65f de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: IllegalStateException: ManagedScript already locked by de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.MonolithicImplicationChecker@533f65f: de.uni_freiburg.informatik.ultimate.lib.smtlibutils.ManagedScript.lock(ManagedScript.java:82) RESULT: Ultimate could not prove your program: Toolchain returned no result. 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_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/list-ext-properties/960521-1_1-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 2b468f3c6542f32922018ecd35f248815c64c681a62a7333b987abbfb42d9345 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-21 00:22:53,785 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-21 00:22:53,787 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-21 00:22:53,827 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-21 00:22:53,828 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-21 00:22:53,829 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-21 00:22:53,832 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-21 00:22:53,835 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-21 00:22:53,838 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-21 00:22:53,839 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-21 00:22:53,841 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-21 00:22:53,843 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-21 00:22:53,843 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-21 00:22:53,845 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-21 00:22:53,847 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-21 00:22:53,848 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-21 00:22:53,850 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-21 00:22:53,851 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-21 00:22:53,854 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-21 00:22:53,857 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-21 00:22:53,859 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-21 00:22:53,861 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-21 00:22:53,863 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-21 00:22:53,864 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-21 00:22:53,869 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-21 00:22:53,870 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-21 00:22:53,870 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-21 00:22:53,872 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-21 00:22:53,872 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-21 00:22:53,874 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-21 00:22:53,878 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-21 00:22:53,879 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-21 00:22:53,881 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-21 00:22:53,883 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-21 00:22:53,889 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-21 00:22:53,890 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-21 00:22:53,892 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-21 00:22:53,892 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-21 00:22:53,893 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-21 00:22:53,894 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-21 00:22:53,896 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-21 00:22:53,897 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Bitvector.epf [2021-11-21 00:22:53,953 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-21 00:22:53,956 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-21 00:22:53,957 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-21 00:22:53,957 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-21 00:22:53,958 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-21 00:22:53,958 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-21 00:22:53,958 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-21 00:22:53,959 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-21 00:22:53,960 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-21 00:22:53,960 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-21 00:22:53,961 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-21 00:22:53,961 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-21 00:22:53,963 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-21 00:22:53,963 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-21 00:22:53,963 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-21 00:22:53,964 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-21 00:22:53,964 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-11-21 00:22:53,964 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-21 00:22:53,964 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-21 00:22:53,965 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-21 00:22:53,965 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-11-21 00:22:53,965 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-11-21 00:22:53,965 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-11-21 00:22:53,966 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-21 00:22:53,966 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-21 00:22:53,966 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-21 00:22:53,966 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-21 00:22:53,967 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-21 00:22:53,967 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-21 00:22:53,967 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-21 00:22:53,968 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-21 00:22:53,968 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-21 00:22:53,968 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 00:22:53,969 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-21 00:22:53,969 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-21 00:22:53,969 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-21 00:22:53,970 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-21 00:22:53,970 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-21 00:22:53,970 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-21 00:22:53,970 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_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 2b468f3c6542f32922018ecd35f248815c64c681a62a7333b987abbfb42d9345 [2021-11-21 00:22:54,369 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-21 00:22:54,389 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-21 00:22:54,393 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-21 00:22:54,394 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-21 00:22:54,395 INFO L275 PluginConnector]: CDTParser initialized [2021-11-21 00:22:54,396 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/list-ext-properties/960521-1_1-2.i [2021-11-21 00:22:54,469 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/data/acd4debe3/5c35f8996a9b4263a82ca19cd1e7f34b/FLAG7cf83e572 [2021-11-21 00:22:55,094 INFO L306 CDTParser]: Found 1 translation units. [2021-11-21 00:22:55,103 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/sv-benchmarks/c/list-ext-properties/960521-1_1-2.i [2021-11-21 00:22:55,127 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/data/acd4debe3/5c35f8996a9b4263a82ca19cd1e7f34b/FLAG7cf83e572 [2021-11-21 00:22:55,467 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/data/acd4debe3/5c35f8996a9b4263a82ca19cd1e7f34b [2021-11-21 00:22:55,469 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-21 00:22:55,471 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-21 00:22:55,472 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-21 00:22:55,472 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-21 00:22:55,478 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-21 00:22:55,478 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 12:22:55" (1/1) ... [2021-11-21 00:22:55,480 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@52ee9fa0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:22:55, skipping insertion in model container [2021-11-21 00:22:55,481 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 12:22:55" (1/1) ... [2021-11-21 00:22:55,488 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-21 00:22:55,536 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-21 00:22:55,824 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 00:22:55,835 INFO L203 MainTranslator]: Completed pre-run [2021-11-21 00:22:55,921 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 00:22:55,966 INFO L208 MainTranslator]: Completed translation [2021-11-21 00:22:55,967 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:22:55 WrapperNode [2021-11-21 00:22:55,967 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-21 00:22:55,968 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-21 00:22:55,969 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-21 00:22:55,969 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-21 00:22:55,976 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:22:55" (1/1) ... [2021-11-21 00:22:55,996 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:22:55" (1/1) ... [2021-11-21 00:22:56,017 INFO L137 Inliner]: procedures = 125, calls = 18, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 78 [2021-11-21 00:22:56,018 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-21 00:22:56,019 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-21 00:22:56,019 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-21 00:22:56,019 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-21 00:22:56,027 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:22:55" (1/1) ... [2021-11-21 00:22:56,027 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:22:55" (1/1) ... [2021-11-21 00:22:56,032 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:22:55" (1/1) ... [2021-11-21 00:22:56,032 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:22:55" (1/1) ... [2021-11-21 00:22:56,041 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:22:55" (1/1) ... [2021-11-21 00:22:56,045 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:22:55" (1/1) ... [2021-11-21 00:22:56,047 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:22:55" (1/1) ... [2021-11-21 00:22:56,050 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-21 00:22:56,059 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-21 00:22:56,059 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-21 00:22:56,059 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-21 00:22:56,060 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:22:55" (1/1) ... [2021-11-21 00:22:56,075 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 00:22:56,087 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:22:56,112 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-21 00:22:56,142 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-21 00:22:56,170 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE4 [2021-11-21 00:22:56,170 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-11-21 00:22:56,170 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-21 00:22:56,170 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-21 00:22:56,172 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE4 [2021-11-21 00:22:56,173 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-21 00:22:56,173 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-21 00:22:56,173 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-21 00:22:56,266 INFO L236 CfgBuilder]: Building ICFG [2021-11-21 00:22:56,268 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-21 00:22:56,643 INFO L277 CfgBuilder]: Performing block encoding [2021-11-21 00:22:56,649 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-21 00:22:56,650 INFO L301 CfgBuilder]: Removed 3 assume(true) statements. [2021-11-21 00:22:56,651 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 12:22:56 BoogieIcfgContainer [2021-11-21 00:22:56,652 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-21 00:22:56,654 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-21 00:22:56,654 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-21 00:22:56,657 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-21 00:22:56,657 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 12:22:55" (1/3) ... [2021-11-21 00:22:56,658 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1bc04d51 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 12:22:56, skipping insertion in model container [2021-11-21 00:22:56,658 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:22:55" (2/3) ... [2021-11-21 00:22:56,658 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1bc04d51 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 12:22:56, skipping insertion in model container [2021-11-21 00:22:56,659 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 12:22:56" (3/3) ... [2021-11-21 00:22:56,660 INFO L111 eAbstractionObserver]: Analyzing ICFG 960521-1_1-2.i [2021-11-21 00:22:56,665 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-21 00:22:56,666 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 23 error locations. [2021-11-21 00:22:56,712 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-21 00:22:56,719 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=false, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, 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 [2021-11-21 00:22:56,719 INFO L340 AbstractCegarLoop]: Starting to check reachability of 23 error locations. [2021-11-21 00:22:56,734 INFO L276 IsEmpty]: Start isEmpty. Operand has 56 states, 32 states have (on average 1.9375) internal successors, (62), 55 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:56,739 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-11-21 00:22:56,740 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:22:56,740 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2021-11-21 00:22:56,741 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 19 more)] === [2021-11-21 00:22:56,746 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:22:56,746 INFO L85 PathProgramCache]: Analyzing trace with hash 28697864, now seen corresponding path program 1 times [2021-11-21 00:22:56,758 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-21 00:22:56,758 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1641059244] [2021-11-21 00:22:56,759 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:22:56,760 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-21 00:22:56,760 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-21 00:22:56,763 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-21 00:22:56,793 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-21 00:22:56,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:22:56,866 INFO L263 TraceCheckSpWp]: Trace formula consists of 34 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-21 00:22:56,871 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:22:56,967 INFO L354 Elim1Store]: treesize reduction 12, result has 40.0 percent of original size [2021-11-21 00:22:56,969 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 14 [2021-11-21 00:22:57,026 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:22:57,026 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:22:57,048 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:22:57,050 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-21 00:22:57,050 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1641059244] [2021-11-21 00:22:57,051 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1641059244] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-21 00:22:57,052 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:22:57,052 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 2 [2021-11-21 00:22:57,055 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [701615642] [2021-11-21 00:22:57,057 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-21 00:22:57,062 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:22:57,062 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-21 00:22:57,102 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:22:57,103 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:22:57,106 INFO L87 Difference]: Start difference. First operand has 56 states, 32 states have (on average 1.9375) internal successors, (62), 55 states have internal predecessors, (62), 0 states have call successors, (0), 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, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:57,206 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:22:57,207 INFO L93 Difference]: Finished difference Result 55 states and 58 transitions. [2021-11-21 00:22:57,208 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:22:57,210 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 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 5 [2021-11-21 00:22:57,210 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:22:57,218 INFO L225 Difference]: With dead ends: 55 [2021-11-21 00:22:57,218 INFO L226 Difference]: Without dead ends: 53 [2021-11-21 00:22:57,219 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:22:57,230 INFO L933 BasicCegarLoop]: 56 mSDtfsCounter, 2 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 90 SdHoareTripleChecker+Invalid, 23 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:22:57,231 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 90 Invalid, 23 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:22:57,250 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-11-21 00:22:57,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2021-11-21 00:22:57,271 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 31 states have (on average 1.8064516129032258) internal successors, (56), 52 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:57,274 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 56 transitions. [2021-11-21 00:22:57,275 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 56 transitions. Word has length 5 [2021-11-21 00:22:57,275 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:22:57,276 INFO L470 AbstractCegarLoop]: Abstraction has 53 states and 56 transitions. [2021-11-21 00:22:57,276 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:57,276 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 56 transitions. [2021-11-21 00:22:57,277 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-11-21 00:22:57,277 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:22:57,277 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2021-11-21 00:22:57,292 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-21 00:22:57,488 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 [2021-11-21 00:22:57,489 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 19 more)] === [2021-11-21 00:22:57,491 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:22:57,492 INFO L85 PathProgramCache]: Analyzing trace with hash 28697865, now seen corresponding path program 1 times [2021-11-21 00:22:57,493 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-21 00:22:57,495 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1221455563] [2021-11-21 00:22:57,496 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:22:57,496 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-21 00:22:57,496 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-21 00:22:57,497 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-21 00:22:57,514 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-21 00:22:57,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:22:57,576 INFO L263 TraceCheckSpWp]: Trace formula consists of 34 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-21 00:22:57,577 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:22:57,614 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-21 00:22:57,615 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 00:22:57,645 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:22:57,646 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:22:57,723 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:22:57,723 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-21 00:22:57,724 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1221455563] [2021-11-21 00:22:57,724 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1221455563] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-21 00:22:57,724 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:22:57,724 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 5 [2021-11-21 00:22:57,725 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1764424925] [2021-11-21 00:22:57,725 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-21 00:22:57,726 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-21 00:22:57,726 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-21 00:22:57,727 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-21 00:22:57,727 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:22:57,727 INFO L87 Difference]: Start difference. First operand 53 states and 56 transitions. Second operand has 6 states, 5 states have (on average 1.8) internal successors, (9), 6 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:58,053 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:22:58,054 INFO L93 Difference]: Finished difference Result 153 states and 162 transitions. [2021-11-21 00:22:58,055 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-21 00:22:58,055 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 1.8) internal successors, (9), 6 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2021-11-21 00:22:58,055 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:22:58,058 INFO L225 Difference]: With dead ends: 153 [2021-11-21 00:22:58,058 INFO L226 Difference]: Without dead ends: 153 [2021-11-21 00:22:58,058 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-11-21 00:22:58,060 INFO L933 BasicCegarLoop]: 44 mSDtfsCounter, 105 mSDsluCounter, 120 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 105 SdHoareTripleChecker+Valid, 164 SdHoareTripleChecker+Invalid, 61 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 59 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:22:58,061 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [105 Valid, 164 Invalid, 61 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 59 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 00:22:58,062 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 153 states. [2021-11-21 00:22:58,070 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 153 to 57. [2021-11-21 00:22:58,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 35 states have (on average 1.7714285714285714) internal successors, (62), 56 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:58,075 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 62 transitions. [2021-11-21 00:22:58,078 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 62 transitions. Word has length 5 [2021-11-21 00:22:58,078 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:22:58,078 INFO L470 AbstractCegarLoop]: Abstraction has 57 states and 62 transitions. [2021-11-21 00:22:58,079 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 1.8) internal successors, (9), 6 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:58,079 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 62 transitions. [2021-11-21 00:22:58,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-21 00:22:58,080 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:22:58,080 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1] [2021-11-21 00:22:58,095 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-11-21 00:22:58,291 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 [2021-11-21 00:22:58,292 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 19 more)] === [2021-11-21 00:22:58,292 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:22:58,292 INFO L85 PathProgramCache]: Analyzing trace with hash 1810564201, now seen corresponding path program 1 times [2021-11-21 00:22:58,293 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-21 00:22:58,293 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1232858670] [2021-11-21 00:22:58,293 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:22:58,294 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-21 00:22:58,294 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-21 00:22:58,295 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-21 00:22:58,312 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-21 00:22:58,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:22:58,345 INFO L263 TraceCheckSpWp]: Trace formula consists of 40 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-21 00:22:58,346 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:22:58,437 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-21 00:22:58,438 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 00:22:58,503 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:22:58,503 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:22:58,687 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:22:58,687 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-21 00:22:58,687 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1232858670] [2021-11-21 00:22:58,687 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1232858670] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:22:58,687 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1192737316] [2021-11-21 00:22:58,687 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:22:58,688 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-21 00:22:58,688 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 [2021-11-21 00:22:58,694 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-21 00:22:58,703 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (5)] Waiting until timeout for monitored process [2021-11-21 00:22:58,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:22:58,774 INFO L263 TraceCheckSpWp]: Trace formula consists of 40 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-21 00:22:58,775 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:22:58,853 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-21 00:22:58,853 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 00:22:58,870 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:22:58,870 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:22:58,932 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:22:58,932 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1192737316] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:22:58,933 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [11601251] [2021-11-21 00:22:58,933 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:22:58,933 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:22:58,933 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:22:58,937 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:22:58,946 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-21 00:22:59,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:22:59,022 INFO L263 TraceCheckSpWp]: Trace formula consists of 40 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-21 00:22:59,023 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:22:59,060 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-21 00:22:59,060 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 00:22:59,071 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:22:59,072 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:22:59,116 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:22:59,117 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [11601251] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:22:59,117 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-21 00:22:59,117 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5, 5] total 9 [2021-11-21 00:22:59,117 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1257203275] [2021-11-21 00:22:59,118 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-21 00:22:59,118 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-21 00:22:59,118 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-21 00:22:59,119 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-21 00:22:59,119 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2021-11-21 00:22:59,120 INFO L87 Difference]: Start difference. First operand 57 states and 62 transitions. Second operand has 10 states, 9 states have (on average 1.4444444444444444) internal successors, (13), 10 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:00,078 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:23:00,078 INFO L93 Difference]: Finished difference Result 353 states and 374 transitions. [2021-11-21 00:23:00,079 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-21 00:23:00,080 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 1.4444444444444444) internal successors, (13), 10 states have internal predecessors, (13), 0 states have call successors, (0), 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 7 [2021-11-21 00:23:00,080 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:23:00,083 INFO L225 Difference]: With dead ends: 353 [2021-11-21 00:23:00,083 INFO L226 Difference]: Without dead ends: 353 [2021-11-21 00:23:00,084 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=113, Invalid=229, Unknown=0, NotChecked=0, Total=342 [2021-11-21 00:23:00,085 INFO L933 BasicCegarLoop]: 126 mSDtfsCounter, 626 mSDsluCounter, 589 mSDsCounter, 0 mSdLazyCounter, 251 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 626 SdHoareTripleChecker+Valid, 715 SdHoareTripleChecker+Invalid, 259 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 251 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-21 00:23:00,086 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [626 Valid, 715 Invalid, 259 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 251 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-21 00:23:00,087 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 353 states. [2021-11-21 00:23:00,095 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 353 to 61. [2021-11-21 00:23:00,096 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 39 states have (on average 1.794871794871795) internal successors, (70), 60 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:00,097 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 70 transitions. [2021-11-21 00:23:00,097 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 70 transitions. Word has length 7 [2021-11-21 00:23:00,097 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:23:00,097 INFO L470 AbstractCegarLoop]: Abstraction has 61 states and 70 transitions. [2021-11-21 00:23:00,098 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 1.4444444444444444) internal successors, (13), 10 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:00,098 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 70 transitions. [2021-11-21 00:23:00,098 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-21 00:23:00,099 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:23:00,099 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:23:00,110 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-21 00:23:00,311 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (5)] Ended with exit code 0 [2021-11-21 00:23:00,529 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2021-11-21 00:23:00,709 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:23:00,710 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 19 more)] === [2021-11-21 00:23:00,710 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:23:00,710 INFO L85 PathProgramCache]: Analyzing trace with hash 239563854, now seen corresponding path program 1 times [2021-11-21 00:23:00,711 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-21 00:23:00,711 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [616429571] [2021-11-21 00:23:00,711 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:23:00,711 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-21 00:23:00,711 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-21 00:23:00,719 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-21 00:23:00,730 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-11-21 00:23:00,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:23:00,767 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-21 00:23:00,768 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:23:00,796 INFO L354 Elim1Store]: treesize reduction 12, result has 40.0 percent of original size [2021-11-21 00:23:00,796 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 14 [2021-11-21 00:23:00,827 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:00,828 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:23:00,862 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:00,862 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-21 00:23:00,863 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [616429571] [2021-11-21 00:23:00,864 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [616429571] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-21 00:23:00,864 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:23:00,864 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 2 [2021-11-21 00:23:00,870 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [923711015] [2021-11-21 00:23:00,870 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-21 00:23:00,871 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:23:00,871 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-21 00:23:00,872 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:23:00,872 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:23:00,872 INFO L87 Difference]: Start difference. First operand 61 states and 70 transitions. Second operand has 3 states, 2 states have (on average 4.0) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:00,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:23:00,923 INFO L93 Difference]: Finished difference Result 58 states and 67 transitions. [2021-11-21 00:23:00,924 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:23:00,924 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 4.0) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 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 8 [2021-11-21 00:23:00,924 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:23:00,926 INFO L225 Difference]: With dead ends: 58 [2021-11-21 00:23:00,926 INFO L226 Difference]: Without dead ends: 58 [2021-11-21 00:23:00,926 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:23:00,928 INFO L933 BasicCegarLoop]: 38 mSDtfsCounter, 29 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 26 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:23:00,928 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 49 Invalid, 26 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:23:00,929 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2021-11-21 00:23:00,932 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2021-11-21 00:23:00,933 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 39 states have (on average 1.7179487179487178) internal successors, (67), 57 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:00,934 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 67 transitions. [2021-11-21 00:23:00,934 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 67 transitions. Word has length 8 [2021-11-21 00:23:00,934 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:23:00,934 INFO L470 AbstractCegarLoop]: Abstraction has 58 states and 67 transitions. [2021-11-21 00:23:00,935 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 4.0) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:00,935 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 67 transitions. [2021-11-21 00:23:00,935 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-21 00:23:00,936 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:23:00,936 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:23:00,954 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2021-11-21 00:23:01,146 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 [2021-11-21 00:23:01,147 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 19 more)] === [2021-11-21 00:23:01,148 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:23:01,148 INFO L85 PathProgramCache]: Analyzing trace with hash 239563855, now seen corresponding path program 1 times [2021-11-21 00:23:01,148 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-21 00:23:01,148 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [61467791] [2021-11-21 00:23:01,148 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:23:01,149 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-21 00:23:01,149 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-21 00:23:01,149 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-21 00:23:01,150 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-11-21 00:23:01,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:23:01,191 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-21 00:23:01,192 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:23:01,230 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-21 00:23:01,231 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 00:23:01,321 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:01,321 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:23:01,570 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:01,571 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-21 00:23:01,571 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [61467791] [2021-11-21 00:23:01,571 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [61467791] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-21 00:23:01,571 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:23:01,571 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 7 [2021-11-21 00:23:01,571 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [291747491] [2021-11-21 00:23:01,571 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-21 00:23:01,572 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-21 00:23:01,572 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-21 00:23:01,572 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-21 00:23:01,573 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2021-11-21 00:23:01,573 INFO L87 Difference]: Start difference. First operand 58 states and 67 transitions. Second operand has 8 states, 7 states have (on average 2.142857142857143) internal successors, (15), 8 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:02,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:23:02,635 INFO L93 Difference]: Finished difference Result 188 states and 202 transitions. [2021-11-21 00:23:02,641 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-21 00:23:02,642 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.142857142857143) internal successors, (15), 8 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-11-21 00:23:02,642 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:23:02,643 INFO L225 Difference]: With dead ends: 188 [2021-11-21 00:23:02,643 INFO L226 Difference]: Without dead ends: 188 [2021-11-21 00:23:02,644 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=57, Invalid=99, Unknown=0, NotChecked=0, Total=156 [2021-11-21 00:23:02,645 INFO L933 BasicCegarLoop]: 46 mSDtfsCounter, 313 mSDsluCounter, 172 mSDsCounter, 0 mSdLazyCounter, 223 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 313 SdHoareTripleChecker+Valid, 218 SdHoareTripleChecker+Invalid, 242 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 223 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-21 00:23:02,646 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [313 Valid, 218 Invalid, 242 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 223 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-21 00:23:02,647 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 188 states. [2021-11-21 00:23:02,652 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 188 to 79. [2021-11-21 00:23:02,653 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 60 states have (on average 1.6) internal successors, (96), 78 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:02,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 96 transitions. [2021-11-21 00:23:02,654 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 96 transitions. Word has length 8 [2021-11-21 00:23:02,654 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:23:02,655 INFO L470 AbstractCegarLoop]: Abstraction has 79 states and 96 transitions. [2021-11-21 00:23:02,655 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 2.142857142857143) internal successors, (15), 8 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:02,655 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 96 transitions. [2021-11-21 00:23:02,656 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-21 00:23:02,656 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:23:02,656 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:23:02,672 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (8)] Ended with exit code 0 [2021-11-21 00:23:02,866 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 [2021-11-21 00:23:02,867 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 19 more)] === [2021-11-21 00:23:02,867 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:23:02,867 INFO L85 PathProgramCache]: Analyzing trace with hash -1976198929, now seen corresponding path program 1 times [2021-11-21 00:23:02,868 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-21 00:23:02,868 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2107858288] [2021-11-21 00:23:02,868 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:23:02,868 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-21 00:23:02,868 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-21 00:23:02,869 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-21 00:23:02,871 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-11-21 00:23:02,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:23:02,914 INFO L263 TraceCheckSpWp]: Trace formula consists of 47 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-21 00:23:02,915 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:23:02,961 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-21 00:23:02,961 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 00:23:03,037 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:03,038 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:23:03,384 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:03,384 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-21 00:23:03,385 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2107858288] [2021-11-21 00:23:03,385 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2107858288] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:23:03,385 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1978839210] [2021-11-21 00:23:03,385 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:23:03,385 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-21 00:23:03,385 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 [2021-11-21 00:23:03,386 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-21 00:23:03,412 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (10)] Waiting until timeout for monitored process [2021-11-21 00:23:03,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:23:03,486 INFO L263 TraceCheckSpWp]: Trace formula consists of 47 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-21 00:23:03,487 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:23:03,536 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-21 00:23:03,537 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 22 [2021-11-21 00:23:03,542 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 21 [2021-11-21 00:23:03,731 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:03,731 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:23:03,844 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:03,844 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1978839210] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:23:03,845 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [82370961] [2021-11-21 00:23:03,845 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:23:03,845 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:23:03,845 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:23:03,846 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:23:03,875 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-21 00:23:03,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:23:03,911 INFO L263 TraceCheckSpWp]: Trace formula consists of 47 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-21 00:23:03,912 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:23:03,944 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-21 00:23:03,945 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 00:23:03,991 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:03,992 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:23:04,111 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:04,111 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [82370961] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:23:04,111 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-21 00:23:04,111 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6, 6] total 13 [2021-11-21 00:23:04,112 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2066878421] [2021-11-21 00:23:04,112 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-21 00:23:04,112 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-21 00:23:04,112 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-21 00:23:04,113 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-21 00:23:04,113 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2021-11-21 00:23:04,113 INFO L87 Difference]: Start difference. First operand 79 states and 96 transitions. Second operand has 14 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 14 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:06,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:23:06,248 INFO L93 Difference]: Finished difference Result 452 states and 479 transitions. [2021-11-21 00:23:06,249 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-21 00:23:06,249 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 14 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2021-11-21 00:23:06,250 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:23:06,252 INFO L225 Difference]: With dead ends: 452 [2021-11-21 00:23:06,253 INFO L226 Difference]: Without dead ends: 452 [2021-11-21 00:23:06,253 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 148 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=199, Invalid=557, Unknown=0, NotChecked=0, Total=756 [2021-11-21 00:23:06,254 INFO L933 BasicCegarLoop]: 47 mSDtfsCounter, 1435 mSDsluCounter, 445 mSDsCounter, 0 mSdLazyCounter, 457 mSolverCounterSat, 47 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1435 SdHoareTripleChecker+Valid, 492 SdHoareTripleChecker+Invalid, 567 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 457 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 63 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2021-11-21 00:23:06,255 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1435 Valid, 492 Invalid, 567 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [47 Valid, 457 Invalid, 0 Unknown, 63 Unchecked, 1.5s Time] [2021-11-21 00:23:06,256 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 452 states. [2021-11-21 00:23:06,262 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 452 to 77. [2021-11-21 00:23:06,262 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 58 states have (on average 1.6206896551724137) internal successors, (94), 76 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:06,264 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 94 transitions. [2021-11-21 00:23:06,264 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 94 transitions. Word has length 10 [2021-11-21 00:23:06,264 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:23:06,264 INFO L470 AbstractCegarLoop]: Abstraction has 77 states and 94 transitions. [2021-11-21 00:23:06,265 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 14 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:06,265 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 94 transitions. [2021-11-21 00:23:06,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-21 00:23:06,266 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:23:06,266 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:23:06,294 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (9)] Ended with exit code 0 [2021-11-21 00:23:06,497 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-21 00:23:06,678 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (10)] Forceful destruction successful, exit code 0 [2021-11-21 00:23:06,877 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt [2021-11-21 00:23:06,877 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 19 more)] === [2021-11-21 00:23:06,878 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:23:06,878 INFO L85 PathProgramCache]: Analyzing trace with hash -1388869610, now seen corresponding path program 1 times [2021-11-21 00:23:06,878 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-21 00:23:06,878 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [641700938] [2021-11-21 00:23:06,878 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:23:06,878 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-21 00:23:06,879 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-21 00:23:06,880 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-21 00:23:06,881 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-11-21 00:23:06,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:23:06,919 INFO L263 TraceCheckSpWp]: Trace formula consists of 48 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-21 00:23:06,920 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:23:06,978 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:06,978 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:23:07,047 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:07,047 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-21 00:23:07,047 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [641700938] [2021-11-21 00:23:07,047 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [641700938] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:23:07,048 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [838593677] [2021-11-21 00:23:07,048 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:23:07,048 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-21 00:23:07,048 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 [2021-11-21 00:23:07,054 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-21 00:23:07,070 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (13)] Waiting until timeout for monitored process [2021-11-21 00:23:07,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:23:07,134 INFO L263 TraceCheckSpWp]: Trace formula consists of 48 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-21 00:23:07,135 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:23:07,187 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:07,187 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:23:07,222 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:07,222 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [838593677] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:23:07,222 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1369693727] [2021-11-21 00:23:07,223 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:23:07,223 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:23:07,223 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:23:07,224 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:23:07,227 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-21 00:23:07,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:23:07,269 INFO L263 TraceCheckSpWp]: Trace formula consists of 48 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-21 00:23:07,270 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:23:07,312 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:07,313 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:23:07,346 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:07,346 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1369693727] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:23:07,346 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-21 00:23:07,347 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5, 5] total 8 [2021-11-21 00:23:07,347 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [643583536] [2021-11-21 00:23:07,347 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-21 00:23:07,348 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-21 00:23:07,348 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-21 00:23:07,349 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-21 00:23:07,349 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-11-21 00:23:07,349 INFO L87 Difference]: Start difference. First operand 77 states and 94 transitions. Second operand has 8 states, 8 states have (on average 2.5) internal successors, (20), 8 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:07,484 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:23:07,485 INFO L93 Difference]: Finished difference Result 101 states and 111 transitions. [2021-11-21 00:23:07,485 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-21 00:23:07,486 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.5) internal successors, (20), 8 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-11-21 00:23:07,486 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:23:07,487 INFO L225 Difference]: With dead ends: 101 [2021-11-21 00:23:07,487 INFO L226 Difference]: Without dead ends: 101 [2021-11-21 00:23:07,487 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-11-21 00:23:07,488 INFO L933 BasicCegarLoop]: 76 mSDtfsCounter, 103 mSDsluCounter, 173 mSDsCounter, 0 mSdLazyCounter, 81 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 103 SdHoareTripleChecker+Valid, 249 SdHoareTripleChecker+Invalid, 87 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 81 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:23:07,489 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [103 Valid, 249 Invalid, 87 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 81 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:23:07,489 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2021-11-21 00:23:07,493 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 76. [2021-11-21 00:23:07,493 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 57 states have (on average 1.5964912280701755) internal successors, (91), 75 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:07,494 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 91 transitions. [2021-11-21 00:23:07,494 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 91 transitions. Word has length 11 [2021-11-21 00:23:07,494 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:23:07,495 INFO L470 AbstractCegarLoop]: Abstraction has 76 states and 91 transitions. [2021-11-21 00:23:07,495 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.5) internal successors, (20), 8 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:07,495 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 91 transitions. [2021-11-21 00:23:07,496 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-21 00:23:07,496 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:23:07,496 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:23:07,522 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-21 00:23:07,717 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (12)] Ended with exit code 0 [2021-11-21 00:23:07,912 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (13)] Forceful destruction successful, exit code 0 [2021-11-21 00:23:08,111 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt [2021-11-21 00:23:08,111 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 19 more)] === [2021-11-21 00:23:08,111 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:23:08,112 INFO L85 PathProgramCache]: Analyzing trace with hash 738364350, now seen corresponding path program 1 times [2021-11-21 00:23:08,112 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-21 00:23:08,112 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2129639937] [2021-11-21 00:23:08,112 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:23:08,112 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-21 00:23:08,112 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-21 00:23:08,113 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-21 00:23:08,121 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2021-11-21 00:23:08,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:23:08,166 INFO L263 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-21 00:23:08,167 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:23:08,229 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:08,229 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:23:08,284 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:08,284 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-21 00:23:08,284 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2129639937] [2021-11-21 00:23:08,284 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2129639937] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:23:08,284 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [167945185] [2021-11-21 00:23:08,284 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:23:08,284 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-21 00:23:08,285 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 [2021-11-21 00:23:08,286 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-21 00:23:08,306 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (16)] Waiting until timeout for monitored process [2021-11-21 00:23:08,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:23:08,373 INFO L263 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-21 00:23:08,374 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:23:08,405 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:08,405 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:23:08,438 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:08,438 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [167945185] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:23:08,438 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [737215675] [2021-11-21 00:23:08,438 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:23:08,439 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:23:08,439 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:23:08,440 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:23:08,463 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-21 00:23:08,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:23:08,493 INFO L263 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-21 00:23:08,494 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:23:08,517 INFO L354 Elim1Store]: treesize reduction 12, result has 40.0 percent of original size [2021-11-21 00:23:08,517 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 14 [2021-11-21 00:23:08,559 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 00:23:08,559 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:23:08,584 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 00:23:08,584 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [737215675] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-21 00:23:08,585 INFO L186 FreeRefinementEngine]: Found 2 perfect and 4 imperfect interpolant sequences. [2021-11-21 00:23:08,585 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [5, 5, 5, 5] total 9 [2021-11-21 00:23:08,585 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1057136319] [2021-11-21 00:23:08,585 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-21 00:23:08,585 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:23:08,585 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-21 00:23:08,586 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:23:08,586 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-11-21 00:23:08,586 INFO L87 Difference]: Start difference. First operand 76 states and 91 transitions. Second operand has 3 states, 2 states have (on average 5.5) internal successors, (11), 3 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) [2021-11-21 00:23:08,659 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:23:08,659 INFO L93 Difference]: Finished difference Result 73 states and 86 transitions. [2021-11-21 00:23:08,659 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:23:08,660 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 5.5) internal successors, (11), 3 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 [2021-11-21 00:23:08,660 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:23:08,660 INFO L225 Difference]: With dead ends: 73 [2021-11-21 00:23:08,660 INFO L226 Difference]: Without dead ends: 73 [2021-11-21 00:23:08,661 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-11-21 00:23:08,661 INFO L933 BasicCegarLoop]: 40 mSDtfsCounter, 24 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 47 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:23:08,662 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [24 Valid, 47 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:23:08,662 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2021-11-21 00:23:08,666 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 73. [2021-11-21 00:23:08,666 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 57 states have (on average 1.5087719298245614) internal successors, (86), 72 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:08,667 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 86 transitions. [2021-11-21 00:23:08,667 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 86 transitions. Word has length 11 [2021-11-21 00:23:08,667 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:23:08,667 INFO L470 AbstractCegarLoop]: Abstraction has 73 states and 86 transitions. [2021-11-21 00:23:08,668 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 5.5) internal successors, (11), 3 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) [2021-11-21 00:23:08,668 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 86 transitions. [2021-11-21 00:23:08,668 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-21 00:23:08,669 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:23:08,669 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:23:08,681 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (15)] Forceful destruction successful, exit code 0 [2021-11-21 00:23:08,880 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (16)] Ended with exit code 0 [2021-11-21 00:23:09,098 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2021-11-21 00:23:09,279 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:23:09,279 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 19 more)] === [2021-11-21 00:23:09,280 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:23:09,280 INFO L85 PathProgramCache]: Analyzing trace with hash 738364351, now seen corresponding path program 1 times [2021-11-21 00:23:09,280 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-21 00:23:09,280 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1571218599] [2021-11-21 00:23:09,280 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:23:09,280 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-21 00:23:09,281 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-21 00:23:09,281 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-21 00:23:09,287 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (18)] Waiting until timeout for monitored process [2021-11-21 00:23:09,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:23:09,325 INFO L263 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-21 00:23:09,325 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:23:09,372 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:09,372 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:23:09,425 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:09,425 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-21 00:23:09,425 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1571218599] [2021-11-21 00:23:09,425 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1571218599] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:23:09,426 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1210801181] [2021-11-21 00:23:09,426 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:23:09,426 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-21 00:23:09,426 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 [2021-11-21 00:23:09,427 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-21 00:23:09,446 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (19)] Waiting until timeout for monitored process [2021-11-21 00:23:09,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:23:09,516 INFO L263 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-21 00:23:09,517 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:23:09,547 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:09,547 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:23:09,578 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:09,578 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1210801181] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:23:09,578 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [733131979] [2021-11-21 00:23:09,579 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:23:09,579 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:23:09,579 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:23:09,580 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:23:09,603 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-21 00:23:09,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:23:09,634 INFO L263 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-21 00:23:09,635 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:23:09,664 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:09,665 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:23:09,696 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:09,696 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [733131979] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:23:09,696 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-21 00:23:09,696 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5, 5] total 8 [2021-11-21 00:23:09,697 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1977024734] [2021-11-21 00:23:09,697 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-21 00:23:09,697 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-21 00:23:09,697 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-21 00:23:09,698 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-21 00:23:09,698 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-11-21 00:23:09,698 INFO L87 Difference]: Start difference. First operand 73 states and 86 transitions. Second operand has 8 states, 8 states have (on average 2.25) internal successors, (18), 8 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:09,948 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:23:09,948 INFO L93 Difference]: Finished difference Result 212 states and 225 transitions. [2021-11-21 00:23:09,949 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-21 00:23:09,950 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.25) internal successors, (18), 8 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-11-21 00:23:09,950 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:23:09,951 INFO L225 Difference]: With dead ends: 212 [2021-11-21 00:23:09,952 INFO L226 Difference]: Without dead ends: 212 [2021-11-21 00:23:09,952 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=52, Invalid=80, Unknown=0, NotChecked=0, Total=132 [2021-11-21 00:23:09,953 INFO L933 BasicCegarLoop]: 65 mSDtfsCounter, 427 mSDsluCounter, 182 mSDsCounter, 0 mSdLazyCounter, 108 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 427 SdHoareTripleChecker+Valid, 247 SdHoareTripleChecker+Invalid, 132 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 108 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:23:09,953 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [427 Valid, 247 Invalid, 132 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 108 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 00:23:09,954 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 212 states. [2021-11-21 00:23:09,958 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 212 to 86. [2021-11-21 00:23:09,958 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 70 states have (on average 1.4285714285714286) internal successors, (100), 85 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:09,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 100 transitions. [2021-11-21 00:23:09,959 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 100 transitions. Word has length 11 [2021-11-21 00:23:09,959 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:23:09,960 INFO L470 AbstractCegarLoop]: Abstraction has 86 states and 100 transitions. [2021-11-21 00:23:09,960 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.25) internal successors, (18), 8 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:09,960 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 100 transitions. [2021-11-21 00:23:09,961 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-21 00:23:09,961 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:23:09,961 INFO L514 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1] [2021-11-21 00:23:10,005 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-21 00:23:10,191 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (18)] Forceful destruction successful, exit code 0 [2021-11-21 00:23:10,379 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (19)] Forceful destruction successful, exit code 0 [2021-11-21 00:23:10,575 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt [2021-11-21 00:23:10,575 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 19 more)] === [2021-11-21 00:23:10,575 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:23:10,575 INFO L85 PathProgramCache]: Analyzing trace with hash 522992425, now seen corresponding path program 2 times [2021-11-21 00:23:10,576 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-21 00:23:10,576 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [922433646] [2021-11-21 00:23:10,576 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-21 00:23:10,576 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-21 00:23:10,576 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-21 00:23:10,577 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-21 00:23:10,579 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (21)] Waiting until timeout for monitored process [2021-11-21 00:23:10,626 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-21 00:23:10,626 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:23:10,628 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-21 00:23:10,629 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:23:10,721 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-21 00:23:10,721 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 00:23:10,757 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:10,757 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:23:11,006 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:11,006 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-21 00:23:11,006 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [922433646] [2021-11-21 00:23:11,006 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [922433646] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:23:11,007 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1514038869] [2021-11-21 00:23:11,007 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-21 00:23:11,007 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-21 00:23:11,007 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 [2021-11-21 00:23:11,027 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-21 00:23:11,046 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (22)] Waiting until timeout for monitored process [2021-11-21 00:23:11,139 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-21 00:23:11,139 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:23:11,141 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-21 00:23:11,142 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:23:11,193 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-21 00:23:11,194 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 00:23:11,203 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:11,203 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:23:11,261 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:11,261 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1514038869] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:23:11,261 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2070692028] [2021-11-21 00:23:11,262 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-21 00:23:11,262 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:23:11,262 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:23:11,267 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:23:11,283 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-21 00:23:11,324 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-21 00:23:11,324 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:23:11,326 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-21 00:23:11,327 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:23:11,386 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-21 00:23:11,386 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 00:23:11,397 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:11,397 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:23:11,459 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:11,460 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2070692028] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:23:11,460 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-21 00:23:11,460 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 9, 9] total 17 [2021-11-21 00:23:11,460 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1607482094] [2021-11-21 00:23:11,461 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-21 00:23:11,461 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-21 00:23:11,461 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-21 00:23:11,462 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-21 00:23:11,462 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=223, Unknown=0, NotChecked=0, Total=306 [2021-11-21 00:23:11,462 INFO L87 Difference]: Start difference. First operand 86 states and 100 transitions. Second operand has 18 states, 17 states have (on average 1.2352941176470589) internal successors, (21), 18 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:13,710 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:23:13,710 INFO L93 Difference]: Finished difference Result 680 states and 723 transitions. [2021-11-21 00:23:13,711 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-11-21 00:23:13,711 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 1.2352941176470589) internal successors, (21), 18 states have internal predecessors, (21), 0 states have call successors, (0), 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 [2021-11-21 00:23:13,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:23:13,716 INFO L225 Difference]: With dead ends: 680 [2021-11-21 00:23:13,716 INFO L226 Difference]: Without dead ends: 680 [2021-11-21 00:23:13,717 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 252 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=463, Invalid=1019, Unknown=0, NotChecked=0, Total=1482 [2021-11-21 00:23:13,718 INFO L933 BasicCegarLoop]: 243 mSDtfsCounter, 2896 mSDsluCounter, 1900 mSDsCounter, 0 mSdLazyCounter, 786 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2896 SdHoareTripleChecker+Valid, 2143 SdHoareTripleChecker+Invalid, 806 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 786 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:23:13,719 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2896 Valid, 2143 Invalid, 806 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 786 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2021-11-21 00:23:13,721 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 680 states. [2021-11-21 00:23:13,728 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 680 to 96. [2021-11-21 00:23:13,729 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 80 states have (on average 1.475) internal successors, (118), 95 states have internal predecessors, (118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:13,730 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 118 transitions. [2021-11-21 00:23:13,730 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 118 transitions. Word has length 11 [2021-11-21 00:23:13,730 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:23:13,731 INFO L470 AbstractCegarLoop]: Abstraction has 96 states and 118 transitions. [2021-11-21 00:23:13,731 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 1.2352941176470589) internal successors, (21), 18 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:13,731 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 118 transitions. [2021-11-21 00:23:13,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-21 00:23:13,732 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:23:13,732 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:23:13,743 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (22)] Forceful destruction successful, exit code 0 [2021-11-21 00:23:13,943 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (21)] Forceful destruction successful, exit code 0 [2021-11-21 00:23:14,159 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Ended with exit code 0 [2021-11-21 00:23:14,335 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:23:14,335 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 19 more)] === [2021-11-21 00:23:14,335 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:23:14,336 INFO L85 PathProgramCache]: Analyzing trace with hash 1416054993, now seen corresponding path program 1 times [2021-11-21 00:23:14,336 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-21 00:23:14,336 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [20736690] [2021-11-21 00:23:14,336 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:23:14,336 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-21 00:23:14,336 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-21 00:23:14,337 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-21 00:23:14,338 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (24)] Waiting until timeout for monitored process [2021-11-21 00:23:14,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:23:14,399 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-21 00:23:14,400 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:23:14,450 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-21 00:23:14,450 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 00:23:14,586 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:14,586 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:23:15,034 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:15,034 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-21 00:23:15,034 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [20736690] [2021-11-21 00:23:15,035 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [20736690] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:23:15,035 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [795697946] [2021-11-21 00:23:15,035 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:23:15,035 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-21 00:23:15,036 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 [2021-11-21 00:23:15,037 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-21 00:23:15,038 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (25)] Waiting until timeout for monitored process [2021-11-21 00:23:15,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:23:15,144 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-21 00:23:15,145 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:23:15,188 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-21 00:23:15,188 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 20 [2021-11-21 00:23:15,193 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 19 [2021-11-21 00:23:15,510 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:15,510 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:23:16,182 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:16,182 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [795697946] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:23:16,182 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [211175434] [2021-11-21 00:23:16,182 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:23:16,182 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:23:16,183 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:23:16,184 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:23:16,205 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-11-21 00:23:16,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:23:16,249 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-21 00:23:16,250 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:23:16,279 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-21 00:23:16,280 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 00:23:16,364 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:16,364 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:23:16,689 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:16,690 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [211175434] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:23:16,691 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-21 00:23:16,693 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 7, 6, 7] total 18 [2021-11-21 00:23:16,693 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1875187206] [2021-11-21 00:23:16,694 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-21 00:23:16,694 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-21 00:23:16,696 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-21 00:23:16,696 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-21 00:23:16,697 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=267, Unknown=0, NotChecked=0, Total=342 [2021-11-21 00:23:16,698 INFO L87 Difference]: Start difference. First operand 96 states and 118 transitions. Second operand has 19 states, 18 states have (on average 2.1666666666666665) internal successors, (39), 19 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:18,515 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:23:18,515 INFO L93 Difference]: Finished difference Result 136 states and 156 transitions. [2021-11-21 00:23:18,516 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-21 00:23:18,516 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 2.1666666666666665) internal successors, (39), 19 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-11-21 00:23:18,516 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:23:18,517 INFO L225 Difference]: With dead ends: 136 [2021-11-21 00:23:18,518 INFO L226 Difference]: Without dead ends: 136 [2021-11-21 00:23:18,518 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 150 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=141, Invalid=561, Unknown=0, NotChecked=0, Total=702 [2021-11-21 00:23:18,519 INFO L933 BasicCegarLoop]: 41 mSDtfsCounter, 96 mSDsluCounter, 175 mSDsCounter, 0 mSdLazyCounter, 229 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 96 SdHoareTripleChecker+Valid, 216 SdHoareTripleChecker+Invalid, 249 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 229 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 11 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:23:18,520 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [96 Valid, 216 Invalid, 249 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 229 Invalid, 0 Unknown, 11 Unchecked, 1.0s Time] [2021-11-21 00:23:18,521 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2021-11-21 00:23:18,524 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 104. [2021-11-21 00:23:18,525 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 88 states have (on average 1.4431818181818181) internal successors, (127), 103 states have internal predecessors, (127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:18,526 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 127 transitions. [2021-11-21 00:23:18,526 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 127 transitions. Word has length 12 [2021-11-21 00:23:18,526 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:23:18,527 INFO L470 AbstractCegarLoop]: Abstraction has 104 states and 127 transitions. [2021-11-21 00:23:18,527 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 18 states have (on average 2.1666666666666665) internal successors, (39), 19 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:18,527 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 127 transitions. [2021-11-21 00:23:18,528 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-21 00:23:18,528 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:23:18,529 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:23:18,560 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Ended with exit code 0 [2021-11-21 00:23:18,748 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (25)] Forceful destruction successful, exit code 0 [2021-11-21 00:23:18,955 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (24)] Ended with exit code 0 [2021-11-21 00:23:19,147 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 [2021-11-21 00:23:19,147 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 19 more)] === [2021-11-21 00:23:19,147 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:23:19,148 INFO L85 PathProgramCache]: Analyzing trace with hash 1898751919, now seen corresponding path program 1 times [2021-11-21 00:23:19,148 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-21 00:23:19,148 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [870229793] [2021-11-21 00:23:19,148 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:23:19,148 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-21 00:23:19,149 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-21 00:23:19,150 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-21 00:23:19,154 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (27)] Waiting until timeout for monitored process [2021-11-21 00:23:19,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:23:19,206 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-21 00:23:19,207 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:23:19,243 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-21 00:23:19,244 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 00:23:19,343 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 00:23:19,344 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:23:19,468 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 00:23:19,468 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-21 00:23:19,469 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [870229793] [2021-11-21 00:23:19,469 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [870229793] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-21 00:23:19,469 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:23:19,469 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 5 [2021-11-21 00:23:19,469 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2136390113] [2021-11-21 00:23:19,469 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-21 00:23:19,469 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-21 00:23:19,470 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-21 00:23:19,470 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-21 00:23:19,470 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:23:19,470 INFO L87 Difference]: Start difference. First operand 104 states and 127 transitions. Second operand has 6 states, 5 states have (on average 5.4) internal successors, (27), 6 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:19,776 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:23:19,776 INFO L93 Difference]: Finished difference Result 147 states and 164 transitions. [2021-11-21 00:23:19,777 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-21 00:23:19,777 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 5.4) internal successors, (27), 6 states have internal predecessors, (27), 0 states have call successors, (0), 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 14 [2021-11-21 00:23:19,778 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:23:19,779 INFO L225 Difference]: With dead ends: 147 [2021-11-21 00:23:19,779 INFO L226 Difference]: Without dead ends: 147 [2021-11-21 00:23:19,779 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-11-21 00:23:19,780 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 147 mSDsluCounter, 93 mSDsCounter, 0 mSdLazyCounter, 115 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 147 SdHoareTripleChecker+Valid, 123 SdHoareTripleChecker+Invalid, 121 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 115 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:23:19,781 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [147 Valid, 123 Invalid, 121 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 115 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 00:23:19,781 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2021-11-21 00:23:19,784 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 108. [2021-11-21 00:23:19,785 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 108 states, 94 states have (on average 1.3936170212765957) internal successors, (131), 107 states have internal predecessors, (131), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:19,785 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 131 transitions. [2021-11-21 00:23:19,786 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 131 transitions. Word has length 14 [2021-11-21 00:23:19,786 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:23:19,786 INFO L470 AbstractCegarLoop]: Abstraction has 108 states and 131 transitions. [2021-11-21 00:23:19,786 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 5.4) internal successors, (27), 6 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:19,787 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 131 transitions. [2021-11-21 00:23:19,788 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-21 00:23:19,788 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:23:19,788 INFO L514 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:23:19,800 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (27)] Ended with exit code 0 [2021-11-21 00:23:19,999 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 [2021-11-21 00:23:20,000 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 19 more)] === [2021-11-21 00:23:20,000 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:23:20,000 INFO L85 PathProgramCache]: Analyzing trace with hash -1674057169, now seen corresponding path program 2 times [2021-11-21 00:23:20,001 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-21 00:23:20,001 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1007863185] [2021-11-21 00:23:20,001 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-21 00:23:20,001 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-21 00:23:20,001 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-21 00:23:20,002 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-21 00:23:20,004 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (28)] Waiting until timeout for monitored process [2021-11-21 00:23:20,047 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2021-11-21 00:23:20,047 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:23:20,049 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-21 00:23:20,050 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:23:20,105 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-21 00:23:20,106 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 15 [2021-11-21 00:23:20,118 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-11-21 00:23:20,347 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-21 00:23:20,348 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:23:20,687 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-21 00:23:20,688 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-21 00:23:20,688 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1007863185] [2021-11-21 00:23:20,688 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1007863185] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-21 00:23:20,688 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:23:20,689 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 7 [2021-11-21 00:23:20,689 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [268394102] [2021-11-21 00:23:20,689 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-21 00:23:20,690 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-21 00:23:20,690 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-21 00:23:20,691 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-21 00:23:20,691 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-11-21 00:23:20,691 INFO L87 Difference]: Start difference. First operand 108 states and 131 transitions. Second operand has 8 states, 7 states have (on average 2.0) internal successors, (14), 8 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:20,953 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:23:20,954 INFO L93 Difference]: Finished difference Result 110 states and 133 transitions. [2021-11-21 00:23:20,954 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 00:23:20,954 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.0) internal successors, (14), 8 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2021-11-21 00:23:20,955 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:23:20,955 INFO L225 Difference]: With dead ends: 110 [2021-11-21 00:23:20,955 INFO L226 Difference]: Without dead ends: 110 [2021-11-21 00:23:20,956 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-11-21 00:23:20,956 INFO L933 BasicCegarLoop]: 41 mSDtfsCounter, 1 mSDsluCounter, 76 mSDsCounter, 0 mSdLazyCounter, 45 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 117 SdHoareTripleChecker+Invalid, 88 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 45 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 43 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:23:20,957 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 117 Invalid, 88 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 45 Invalid, 0 Unknown, 43 Unchecked, 0.3s Time] [2021-11-21 00:23:20,957 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2021-11-21 00:23:20,959 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 104. [2021-11-21 00:23:20,960 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 90 states have (on average 1.4111111111111112) internal successors, (127), 103 states have internal predecessors, (127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:20,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 127 transitions. [2021-11-21 00:23:20,961 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 127 transitions. Word has length 14 [2021-11-21 00:23:20,961 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:23:20,961 INFO L470 AbstractCegarLoop]: Abstraction has 104 states and 127 transitions. [2021-11-21 00:23:20,961 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 2.0) internal successors, (14), 8 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:20,961 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 127 transitions. [2021-11-21 00:23:20,962 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-21 00:23:20,962 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:23:20,962 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:23:20,975 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (28)] Forceful destruction successful, exit code 0 [2021-11-21 00:23:21,172 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 [2021-11-21 00:23:21,173 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 19 more)] === [2021-11-21 00:23:21,173 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:23:21,173 INFO L85 PathProgramCache]: Analyzing trace with hash 525487188, now seen corresponding path program 2 times [2021-11-21 00:23:21,173 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-21 00:23:21,173 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [905701400] [2021-11-21 00:23:21,174 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-21 00:23:21,174 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-21 00:23:21,174 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-21 00:23:21,176 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-21 00:23:21,177 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (29)] Waiting until timeout for monitored process [2021-11-21 00:23:21,227 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-21 00:23:21,227 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:23:21,230 INFO L263 TraceCheckSpWp]: Trace formula consists of 58 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-21 00:23:21,231 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:23:21,321 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:21,322 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:23:21,430 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:21,430 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-21 00:23:21,430 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [905701400] [2021-11-21 00:23:21,430 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [905701400] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:23:21,430 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1079260750] [2021-11-21 00:23:21,430 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-21 00:23:21,431 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-21 00:23:21,431 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 [2021-11-21 00:23:21,433 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-21 00:23:21,433 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (30)] Waiting until timeout for monitored process [2021-11-21 00:23:21,536 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-21 00:23:21,536 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:23:21,538 INFO L263 TraceCheckSpWp]: Trace formula consists of 58 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-21 00:23:21,538 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:23:21,596 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:21,597 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:23:21,642 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:21,642 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1079260750] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:23:21,643 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [362433901] [2021-11-21 00:23:21,643 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-21 00:23:21,643 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:23:21,643 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:23:21,653 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:23:21,654 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2021-11-21 00:23:21,720 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-21 00:23:21,720 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:23:21,723 INFO L263 TraceCheckSpWp]: Trace formula consists of 58 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-21 00:23:21,724 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:23:21,799 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:21,799 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:23:21,855 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:21,856 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [362433901] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:23:21,856 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-21 00:23:21,856 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 7, 7, 7] total 12 [2021-11-21 00:23:21,857 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [322058016] [2021-11-21 00:23:21,857 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-21 00:23:21,858 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-21 00:23:21,858 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-21 00:23:21,859 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-21 00:23:21,859 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2021-11-21 00:23:21,859 INFO L87 Difference]: Start difference. First operand 104 states and 127 transitions. Second operand has 12 states, 12 states have (on average 2.3333333333333335) internal successors, (28), 12 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:22,199 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:23:22,199 INFO L93 Difference]: Finished difference Result 141 states and 156 transitions. [2021-11-21 00:23:22,200 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-21 00:23:22,200 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.3333333333333335) internal successors, (28), 12 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2021-11-21 00:23:22,201 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:23:22,202 INFO L225 Difference]: With dead ends: 141 [2021-11-21 00:23:22,202 INFO L226 Difference]: Without dead ends: 141 [2021-11-21 00:23:22,202 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 74 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=57, Invalid=153, Unknown=0, NotChecked=0, Total=210 [2021-11-21 00:23:22,203 INFO L933 BasicCegarLoop]: 60 mSDtfsCounter, 143 mSDsluCounter, 353 mSDsCounter, 0 mSdLazyCounter, 231 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 143 SdHoareTripleChecker+Valid, 413 SdHoareTripleChecker+Invalid, 248 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 231 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:23:22,204 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [143 Valid, 413 Invalid, 248 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 231 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 00:23:22,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2021-11-21 00:23:22,207 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 103. [2021-11-21 00:23:22,208 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 89 states have (on average 1.3820224719101124) internal successors, (123), 102 states have internal predecessors, (123), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:22,209 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 123 transitions. [2021-11-21 00:23:22,209 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 123 transitions. Word has length 15 [2021-11-21 00:23:22,209 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:23:22,209 INFO L470 AbstractCegarLoop]: Abstraction has 103 states and 123 transitions. [2021-11-21 00:23:22,210 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.3333333333333335) internal successors, (28), 12 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:22,210 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 123 transitions. [2021-11-21 00:23:22,211 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-21 00:23:22,211 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:23:22,211 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:23:22,214 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (30)] Forceful destruction successful, exit code 0 [2021-11-21 00:23:22,438 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Ended with exit code 0 [2021-11-21 00:23:22,622 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (29)] Forceful destruction successful, exit code 0 [2021-11-21 00:23:22,814 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 [2021-11-21 00:23:22,814 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 19 more)] === [2021-11-21 00:23:22,814 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:23:22,814 INFO L85 PathProgramCache]: Analyzing trace with hash -2050699967, now seen corresponding path program 1 times [2021-11-21 00:23:22,815 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-21 00:23:22,815 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1346776543] [2021-11-21 00:23:22,815 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:23:22,815 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-21 00:23:22,815 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-21 00:23:22,816 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-21 00:23:22,817 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (32)] Waiting until timeout for monitored process [2021-11-21 00:23:22,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:23:22,853 INFO L263 TraceCheckSpWp]: Trace formula consists of 56 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-21 00:23:22,856 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:23:22,928 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:22,928 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:23:23,025 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:23,025 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-21 00:23:23,025 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1346776543] [2021-11-21 00:23:23,025 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1346776543] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:23:23,026 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2065311772] [2021-11-21 00:23:23,026 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:23:23,026 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-21 00:23:23,026 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 [2021-11-21 00:23:23,027 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-21 00:23:23,028 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (33)] Waiting until timeout for monitored process [2021-11-21 00:23:23,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:23:23,093 INFO L263 TraceCheckSpWp]: Trace formula consists of 56 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-21 00:23:23,094 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:23:23,132 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:23,132 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:23:23,180 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:23,180 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2065311772] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:23:23,180 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [965693017] [2021-11-21 00:23:23,180 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:23:23,180 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:23:23,181 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:23:23,181 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:23:23,187 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2021-11-21 00:23:23,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:23:23,226 INFO L263 TraceCheckSpWp]: Trace formula consists of 56 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-21 00:23:23,226 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:23:23,276 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:23,276 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:23:23,473 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-21 00:23:23,473 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [965693017] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:23:23,473 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-21 00:23:23,473 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 7, 7, 7] total 17 [2021-11-21 00:23:23,474 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1263645522] [2021-11-21 00:23:23,474 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-21 00:23:23,474 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-21 00:23:23,474 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-21 00:23:23,475 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-21 00:23:23,475 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=204, Unknown=0, NotChecked=0, Total=272 [2021-11-21 00:23:23,475 INFO L87 Difference]: Start difference. First operand 103 states and 123 transitions. Second operand has 17 states, 17 states have (on average 2.235294117647059) internal successors, (38), 17 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:24,471 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:23:24,471 INFO L93 Difference]: Finished difference Result 196 states and 209 transitions. [2021-11-21 00:23:24,472 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-21 00:23:24,472 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.235294117647059) internal successors, (38), 17 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2021-11-21 00:23:24,473 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:23:24,474 INFO L225 Difference]: With dead ends: 196 [2021-11-21 00:23:24,474 INFO L226 Difference]: Without dead ends: 196 [2021-11-21 00:23:24,475 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 70 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 148 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=221, Invalid=709, Unknown=0, NotChecked=0, Total=930 [2021-11-21 00:23:24,475 INFO L933 BasicCegarLoop]: 77 mSDtfsCounter, 511 mSDsluCounter, 268 mSDsCounter, 0 mSdLazyCounter, 313 mSolverCounterSat, 71 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 511 SdHoareTripleChecker+Valid, 345 SdHoareTripleChecker+Invalid, 384 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 71 IncrementalHoareTripleChecker+Valid, 313 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-21 00:23:24,476 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [511 Valid, 345 Invalid, 384 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [71 Valid, 313 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-21 00:23:24,477 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2021-11-21 00:23:24,480 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 128. [2021-11-21 00:23:24,480 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 128 states, 114 states have (on average 1.3157894736842106) internal successors, (150), 127 states have internal predecessors, (150), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:24,481 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 150 transitions. [2021-11-21 00:23:24,481 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 150 transitions. Word has length 15 [2021-11-21 00:23:24,481 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:23:24,482 INFO L470 AbstractCegarLoop]: Abstraction has 128 states and 150 transitions. [2021-11-21 00:23:24,482 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.235294117647059) internal successors, (38), 17 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:24,482 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 150 transitions. [2021-11-21 00:23:24,483 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-21 00:23:24,483 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:23:24,483 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:23:24,502 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (32)] Forceful destruction successful, exit code 0 [2021-11-21 00:23:24,735 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2021-11-21 00:23:24,908 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (33)] Ended with exit code 0 [2021-11-21 00:23:25,106 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3,34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt [2021-11-21 00:23:25,107 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 19 more)] === [2021-11-21 00:23:25,107 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:23:25,107 INFO L85 PathProgramCache]: Analyzing trace with hash 854407055, now seen corresponding path program 3 times [2021-11-21 00:23:25,107 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-21 00:23:25,108 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1152063518] [2021-11-21 00:23:25,108 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:23:25,108 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-21 00:23:25,108 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-21 00:23:25,108 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-21 00:23:25,109 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (35)] Waiting until timeout for monitored process [2021-11-21 00:23:25,159 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-21 00:23:25,160 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:23:25,162 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-21 00:23:25,163 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:23:25,195 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-21 00:23:25,195 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 19 [2021-11-21 00:23:25,198 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 18 [2021-11-21 00:23:25,492 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:25,492 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:23:26,843 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:26,843 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-21 00:23:26,843 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1152063518] [2021-11-21 00:23:26,843 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1152063518] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:23:26,843 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [620465668] [2021-11-21 00:23:26,843 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:23:26,843 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-21 00:23:26,844 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 [2021-11-21 00:23:26,844 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-21 00:23:26,845 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (36)] Waiting until timeout for monitored process [2021-11-21 00:23:26,935 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-21 00:23:26,935 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:23:26,936 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-21 00:23:26,937 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:23:26,970 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-21 00:23:26,971 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 20 [2021-11-21 00:23:26,974 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 19 [2021-11-21 00:23:27,161 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:27,161 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:23:27,681 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:27,681 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [620465668] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:23:27,681 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [836716232] [2021-11-21 00:23:27,681 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:23:27,681 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:23:27,681 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:23:27,682 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:23:27,683 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2021-11-21 00:23:27,735 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-21 00:23:27,735 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:23:27,737 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-21 00:23:27,738 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:23:27,770 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-21 00:23:27,771 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 00:23:27,984 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:27,985 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:23:28,525 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:28,525 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [836716232] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:23:28,525 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-21 00:23:28,525 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 8, 9, 8, 9] total 20 [2021-11-21 00:23:28,526 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1470298191] [2021-11-21 00:23:28,526 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-21 00:23:28,526 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-11-21 00:23:28,526 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-21 00:23:28,527 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-11-21 00:23:28,527 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=334, Unknown=0, NotChecked=0, Total=420 [2021-11-21 00:23:28,527 INFO L87 Difference]: Start difference. First operand 128 states and 150 transitions. Second operand has 21 states, 20 states have (on average 2.1) internal successors, (42), 21 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:33,933 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:23:33,933 INFO L93 Difference]: Finished difference Result 209 states and 224 transitions. [2021-11-21 00:23:33,934 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-21 00:23:33,934 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 2.1) internal successors, (42), 21 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2021-11-21 00:23:33,934 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:23:33,935 INFO L225 Difference]: With dead ends: 209 [2021-11-21 00:23:33,935 INFO L226 Difference]: Without dead ends: 209 [2021-11-21 00:23:33,935 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 72 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 271 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=205, Invalid=985, Unknown=0, NotChecked=0, Total=1190 [2021-11-21 00:23:33,936 INFO L933 BasicCegarLoop]: 47 mSDtfsCounter, 247 mSDsluCounter, 270 mSDsCounter, 0 mSdLazyCounter, 560 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 247 SdHoareTripleChecker+Valid, 317 SdHoareTripleChecker+Invalid, 595 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 560 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 14 IncrementalHoareTripleChecker+Unchecked, 3.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:23:33,936 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [247 Valid, 317 Invalid, 595 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 560 Invalid, 0 Unknown, 14 Unchecked, 3.0s Time] [2021-11-21 00:23:33,937 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2021-11-21 00:23:33,940 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 139. [2021-11-21 00:23:33,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 139 states, 125 states have (on average 1.296) internal successors, (162), 138 states have internal predecessors, (162), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:33,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 162 transitions. [2021-11-21 00:23:33,941 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 162 transitions. Word has length 16 [2021-11-21 00:23:33,941 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:23:33,942 INFO L470 AbstractCegarLoop]: Abstraction has 139 states and 162 transitions. [2021-11-21 00:23:33,942 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 20 states have (on average 2.1) internal successors, (42), 21 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:33,942 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 162 transitions. [2021-11-21 00:23:33,943 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-21 00:23:33,943 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:23:33,943 INFO L514 BasicCegarLoop]: trace histogram [5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:23:33,959 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (35)] Forceful destruction successful, exit code 0 [2021-11-21 00:23:34,173 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Ended with exit code 0 [2021-11-21 00:23:34,355 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (36)] Ended with exit code 0 [2021-11-21 00:23:34,554 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3,37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt [2021-11-21 00:23:34,554 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 19 more)] === [2021-11-21 00:23:34,554 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:23:34,554 INFO L85 PathProgramCache]: Analyzing trace with hash -283489775, now seen corresponding path program 4 times [2021-11-21 00:23:34,555 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-21 00:23:34,555 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1686376211] [2021-11-21 00:23:34,555 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:23:34,555 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-21 00:23:34,555 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-21 00:23:34,556 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-21 00:23:34,557 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (38)] Waiting until timeout for monitored process [2021-11-21 00:23:34,597 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:23:34,597 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:23:34,599 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-21 00:23:34,600 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:23:34,684 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-21 00:23:34,684 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 00:23:34,794 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:34,794 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:23:35,409 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:35,409 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-21 00:23:35,410 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1686376211] [2021-11-21 00:23:35,410 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1686376211] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:23:35,410 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1245297130] [2021-11-21 00:23:35,410 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:23:35,410 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-21 00:23:35,410 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 [2021-11-21 00:23:35,411 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-21 00:23:35,412 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (39)] Waiting until timeout for monitored process [2021-11-21 00:23:35,493 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:23:35,493 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:23:35,494 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-21 00:23:35,495 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:23:35,527 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-21 00:23:35,528 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 19 [2021-11-21 00:23:35,530 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 18 [2021-11-21 00:23:35,742 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:35,742 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:23:36,534 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:36,535 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1245297130] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:23:36,535 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1244286049] [2021-11-21 00:23:36,535 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:23:36,535 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:23:36,535 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:23:36,536 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:23:36,538 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2021-11-21 00:23:36,577 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:23:36,577 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:23:36,579 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-21 00:23:36,579 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:23:36,611 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-21 00:23:36,611 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 00:23:36,662 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:36,663 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:23:36,873 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:36,873 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1244286049] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:23:36,873 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-21 00:23:36,873 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10, 11, 10, 11] total 30 [2021-11-21 00:23:36,874 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [835503980] [2021-11-21 00:23:36,874 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-21 00:23:36,874 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-11-21 00:23:36,874 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-21 00:23:36,875 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-11-21 00:23:36,875 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=755, Unknown=0, NotChecked=0, Total=930 [2021-11-21 00:23:36,876 INFO L87 Difference]: Start difference. First operand 139 states and 162 transitions. Second operand has 31 states, 30 states have (on average 1.7) internal successors, (51), 31 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:48,689 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.08s for a HTC check with result VALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:23:51,307 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:23:51,307 INFO L93 Difference]: Finished difference Result 500 states and 520 transitions. [2021-11-21 00:23:51,308 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2021-11-21 00:23:51,308 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 30 states have (on average 1.7) internal successors, (51), 31 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2021-11-21 00:23:51,308 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:23:51,311 INFO L225 Difference]: With dead ends: 500 [2021-11-21 00:23:51,311 INFO L226 Difference]: Without dead ends: 500 [2021-11-21 00:23:51,313 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1240 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=1160, Invalid=3810, Unknown=0, NotChecked=0, Total=4970 [2021-11-21 00:23:51,314 INFO L933 BasicCegarLoop]: 83 mSDtfsCounter, 2437 mSDsluCounter, 772 mSDsCounter, 0 mSdLazyCounter, 1814 mSolverCounterSat, 177 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2437 SdHoareTripleChecker+Valid, 855 SdHoareTripleChecker+Invalid, 2000 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 177 IncrementalHoareTripleChecker+Valid, 1814 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 9 IncrementalHoareTripleChecker+Unchecked, 9.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:23:51,314 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2437 Valid, 855 Invalid, 2000 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [177 Valid, 1814 Invalid, 0 Unknown, 9 Unchecked, 9.3s Time] [2021-11-21 00:23:51,315 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 500 states. [2021-11-21 00:23:51,321 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 500 to 138. [2021-11-21 00:23:51,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 138 states, 124 states have (on average 1.2903225806451613) internal successors, (160), 137 states have internal predecessors, (160), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:51,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 160 transitions. [2021-11-21 00:23:51,322 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 160 transitions. Word has length 16 [2021-11-21 00:23:51,323 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:23:51,323 INFO L470 AbstractCegarLoop]: Abstraction has 138 states and 160 transitions. [2021-11-21 00:23:51,323 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 30 states have (on average 1.7) internal successors, (51), 31 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:51,323 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 160 transitions. [2021-11-21 00:23:51,324 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-21 00:23:51,324 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:23:51,324 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:23:51,337 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (38)] Forceful destruction successful, exit code 0 [2021-11-21 00:23:51,560 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Ended with exit code 0 [2021-11-21 00:23:51,739 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (39)] Forceful destruction successful, exit code 0 [2021-11-21 00:23:51,937 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3,40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt [2021-11-21 00:23:51,937 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 19 more)] === [2021-11-21 00:23:51,938 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:23:51,938 INFO L85 PathProgramCache]: Analyzing trace with hash -1813005665, now seen corresponding path program 2 times [2021-11-21 00:23:51,938 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-21 00:23:51,938 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1250734796] [2021-11-21 00:23:51,938 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-21 00:23:51,939 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-21 00:23:51,939 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-21 00:23:51,940 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-21 00:23:51,997 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (41)] Waiting until timeout for monitored process [2021-11-21 00:23:52,034 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-21 00:23:52,035 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:23:52,039 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-21 00:23:52,040 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:23:52,083 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-21 00:23:52,084 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 00:23:52,215 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-21 00:23:52,215 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:23:52,567 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-21 00:23:52,567 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-21 00:23:52,567 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1250734796] [2021-11-21 00:23:52,568 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1250734796] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:23:52,568 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1083199895] [2021-11-21 00:23:52,568 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-21 00:23:52,568 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-21 00:23:52,568 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 [2021-11-21 00:23:52,569 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-21 00:23:52,570 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (42)] Waiting until timeout for monitored process [2021-11-21 00:23:52,672 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-21 00:23:52,672 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:23:52,673 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-21 00:23:52,674 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:23:52,703 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-21 00:23:52,703 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 00:23:52,785 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-21 00:23:52,785 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:23:52,954 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-21 00:23:52,954 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1083199895] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:23:52,954 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [64510672] [2021-11-21 00:23:52,955 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-21 00:23:52,955 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:23:52,955 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:23:52,956 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:23:52,957 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2021-11-21 00:23:53,004 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-21 00:23:53,005 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:23:53,007 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-21 00:23:53,007 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:23:53,042 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-21 00:23:53,042 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 00:23:53,119 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-21 00:23:53,119 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:23:53,288 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-21 00:23:53,288 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [64510672] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:23:53,288 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-21 00:23:53,288 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5, 5] total 9 [2021-11-21 00:23:53,288 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1109039850] [2021-11-21 00:23:53,288 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-21 00:23:53,289 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-21 00:23:53,289 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-21 00:23:53,289 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-21 00:23:53,290 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2021-11-21 00:23:53,290 INFO L87 Difference]: Start difference. First operand 138 states and 160 transitions. Second operand has 10 states, 9 states have (on average 3.0) internal successors, (27), 10 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:54,339 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:23:54,339 INFO L93 Difference]: Finished difference Result 250 states and 266 transitions. [2021-11-21 00:23:54,340 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-21 00:23:54,340 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 3.0) internal successors, (27), 10 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2021-11-21 00:23:54,340 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:23:54,342 INFO L225 Difference]: With dead ends: 250 [2021-11-21 00:23:54,342 INFO L226 Difference]: Without dead ends: 250 [2021-11-21 00:23:54,342 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=81, Invalid=191, Unknown=0, NotChecked=0, Total=272 [2021-11-21 00:23:54,343 INFO L933 BasicCegarLoop]: 44 mSDtfsCounter, 297 mSDsluCounter, 183 mSDsCounter, 0 mSdLazyCounter, 271 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 297 SdHoareTripleChecker+Valid, 227 SdHoareTripleChecker+Invalid, 292 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 271 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-21 00:23:54,343 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [297 Valid, 227 Invalid, 292 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 271 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-21 00:23:54,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 250 states. [2021-11-21 00:23:54,348 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 250 to 158. [2021-11-21 00:23:54,348 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 158 states, 144 states have (on average 1.2708333333333333) internal successors, (183), 157 states have internal predecessors, (183), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:54,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 158 states to 158 states and 183 transitions. [2021-11-21 00:23:54,357 INFO L78 Accepts]: Start accepts. Automaton has 158 states and 183 transitions. Word has length 17 [2021-11-21 00:23:54,358 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:23:54,358 INFO L470 AbstractCegarLoop]: Abstraction has 158 states and 183 transitions. [2021-11-21 00:23:54,358 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 3.0) internal successors, (27), 10 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:54,358 INFO L276 IsEmpty]: Start isEmpty. Operand 158 states and 183 transitions. [2021-11-21 00:23:54,359 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-11-21 00:23:54,359 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:23:54,359 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:23:54,364 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (42)] Forceful destruction successful, exit code 0 [2021-11-21 00:23:54,567 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (41)] Ended with exit code 0 [2021-11-21 00:23:54,779 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Ended with exit code 0 [2021-11-21 00:23:54,960 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt,41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3,43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:23:54,960 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr17ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 19 more)] === [2021-11-21 00:23:54,961 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:23:54,961 INFO L85 PathProgramCache]: Analyzing trace with hash 908204385, now seen corresponding path program 1 times [2021-11-21 00:23:54,961 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-21 00:23:54,961 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [295920718] [2021-11-21 00:23:54,961 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:23:54,961 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-21 00:23:54,961 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-21 00:23:54,962 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-21 00:23:54,964 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (44)] Waiting until timeout for monitored process [2021-11-21 00:23:55,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:23:55,014 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-21 00:23:55,015 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:23:55,078 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 00:23:55,078 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:23:55,133 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 00:23:55,133 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-21 00:23:55,133 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [295920718] [2021-11-21 00:23:55,134 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [295920718] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-21 00:23:55,134 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:23:55,134 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 2 [2021-11-21 00:23:55,134 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2004740587] [2021-11-21 00:23:55,134 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-21 00:23:55,134 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:23:55,134 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-21 00:23:55,135 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:23:55,135 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:23:55,135 INFO L87 Difference]: Start difference. First operand 158 states and 183 transitions. Second operand has 3 states, 2 states have (on average 9.0) internal successors, (18), 3 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:55,164 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:23:55,164 INFO L93 Difference]: Finished difference Result 156 states and 180 transitions. [2021-11-21 00:23:55,164 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:23:55,165 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 9.0) internal successors, (18), 3 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2021-11-21 00:23:55,165 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:23:55,165 INFO L225 Difference]: With dead ends: 156 [2021-11-21 00:23:55,166 INFO L226 Difference]: Without dead ends: 156 [2021-11-21 00:23:55,166 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:23:55,166 INFO L933 BasicCegarLoop]: 34 mSDtfsCounter, 28 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:23:55,167 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 34 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:23:55,167 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2021-11-21 00:23:55,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 156. [2021-11-21 00:23:55,169 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 156 states, 144 states have (on average 1.25) internal successors, (180), 155 states have internal predecessors, (180), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:55,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 180 transitions. [2021-11-21 00:23:55,170 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 180 transitions. Word has length 18 [2021-11-21 00:23:55,170 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:23:55,170 INFO L470 AbstractCegarLoop]: Abstraction has 156 states and 180 transitions. [2021-11-21 00:23:55,170 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 9.0) internal successors, (18), 3 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:55,171 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 180 transitions. [2021-11-21 00:23:55,171 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-21 00:23:55,171 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:23:55,172 INFO L514 BasicCegarLoop]: trace histogram [14, 1, 1, 1, 1, 1] [2021-11-21 00:23:55,184 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (44)] Ended with exit code 0 [2021-11-21 00:23:55,383 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 [2021-11-21 00:23:55,384 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 19 more)] === [2021-11-21 00:23:55,384 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:23:55,384 INFO L85 PathProgramCache]: Analyzing trace with hash -764245847, now seen corresponding path program 3 times [2021-11-21 00:23:55,384 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-21 00:23:55,385 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [598723402] [2021-11-21 00:23:55,385 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:23:55,385 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-21 00:23:55,385 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-21 00:23:55,386 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-21 00:23:55,387 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (45)] Waiting until timeout for monitored process [2021-11-21 00:23:55,459 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-11-21 00:23:55,459 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:23:55,462 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-21 00:23:55,463 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:23:55,657 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-21 00:23:55,658 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 00:23:55,701 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:55,701 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:23:56,365 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:56,365 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-21 00:23:56,365 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [598723402] [2021-11-21 00:23:56,365 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [598723402] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:23:56,365 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [92385179] [2021-11-21 00:23:56,366 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:23:56,366 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-21 00:23:56,366 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 [2021-11-21 00:23:56,368 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-21 00:23:56,371 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (46)] Waiting until timeout for monitored process [2021-11-21 00:23:56,476 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-11-21 00:23:56,476 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:23:56,478 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-21 00:23:56,478 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:23:56,544 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-21 00:23:56,545 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 00:23:56,552 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:56,552 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:23:56,623 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:56,623 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [92385179] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:23:56,624 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2141235397] [2021-11-21 00:23:56,624 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:23:56,624 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:23:56,624 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:23:56,625 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:23:56,626 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2021-11-21 00:23:56,690 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-11-21 00:23:56,691 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:23:56,693 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-21 00:23:56,693 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:23:56,788 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-21 00:23:56,789 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 00:23:56,797 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:56,797 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:23:56,867 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:56,867 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2141235397] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:23:56,868 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-21 00:23:56,868 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17, 17, 17, 17] total 33 [2021-11-21 00:23:56,868 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [183414042] [2021-11-21 00:23:56,868 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-21 00:23:56,869 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-21 00:23:56,869 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-21 00:23:56,869 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-21 00:23:56,869 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=291, Invalid=831, Unknown=0, NotChecked=0, Total=1122 [2021-11-21 00:23:56,870 INFO L87 Difference]: Start difference. First operand 156 states and 180 transitions. Second operand has 34 states, 33 states have (on average 1.121212121212121) internal successors, (37), 34 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:24:05,137 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:24:05,137 INFO L93 Difference]: Finished difference Result 1343 states and 1402 transitions. [2021-11-21 00:24:05,138 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2021-11-21 00:24:05,138 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 33 states have (on average 1.121212121212121) internal successors, (37), 34 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2021-11-21 00:24:05,139 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:24:05,144 INFO L225 Difference]: With dead ends: 1343 [2021-11-21 00:24:05,144 INFO L226 Difference]: Without dead ends: 1343 [2021-11-21 00:24:05,146 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 76 SyntacticMatches, 0 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1260 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=1883, Invalid=4279, Unknown=0, NotChecked=0, Total=6162 [2021-11-21 00:24:05,147 INFO L933 BasicCegarLoop]: 411 mSDtfsCounter, 7680 mSDsluCounter, 6827 mSDsCounter, 0 mSdLazyCounter, 3304 mSolverCounterSat, 44 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7680 SdHoareTripleChecker+Valid, 7238 SdHoareTripleChecker+Invalid, 3348 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 44 IncrementalHoareTripleChecker+Valid, 3304 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:24:05,147 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7680 Valid, 7238 Invalid, 3348 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [44 Valid, 3304 Invalid, 0 Unknown, 0 Unchecked, 4.0s Time] [2021-11-21 00:24:05,149 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1343 states. [2021-11-21 00:24:05,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1343 to 172. [2021-11-21 00:24:05,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 172 states, 160 states have (on average 1.325) internal successors, (212), 171 states have internal predecessors, (212), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:24:05,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 212 transitions. [2021-11-21 00:24:05,161 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 212 transitions. Word has length 19 [2021-11-21 00:24:05,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:24:05,161 INFO L470 AbstractCegarLoop]: Abstraction has 172 states and 212 transitions. [2021-11-21 00:24:05,162 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 33 states have (on average 1.121212121212121) internal successors, (37), 34 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:24:05,162 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 212 transitions. [2021-11-21 00:24:05,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-21 00:24:05,163 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:24:05,163 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:24:05,209 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Forceful destruction successful, exit code 0 [2021-11-21 00:24:05,387 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (45)] Ended with exit code 0 [2021-11-21 00:24:05,580 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (46)] Ended with exit code 0 [2021-11-21 00:24:05,779 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3,46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt [2021-11-21 00:24:05,779 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr13ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 19 more)] === [2021-11-21 00:24:05,779 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:24:05,779 INFO L85 PathProgramCache]: Analyzing trace with hash 892696213, now seen corresponding path program 1 times [2021-11-21 00:24:05,780 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-21 00:24:05,780 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1399959065] [2021-11-21 00:24:05,780 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:24:05,780 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-21 00:24:05,780 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-21 00:24:05,781 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-21 00:24:05,783 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (48)] Waiting until timeout for monitored process [2021-11-21 00:24:05,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:24:05,836 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-21 00:24:05,837 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:24:05,941 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-11-21 00:24:05,960 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 00:24:05,960 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:24:06,012 INFO L354 Elim1Store]: treesize reduction 10, result has 33.3 percent of original size [2021-11-21 00:24:06,013 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 9 [2021-11-21 00:24:06,068 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 00:24:06,069 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-21 00:24:06,069 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1399959065] [2021-11-21 00:24:06,069 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1399959065] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-21 00:24:06,069 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:24:06,069 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6, 5] imperfect sequences [] total 8 [2021-11-21 00:24:06,069 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1536067078] [2021-11-21 00:24:06,069 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-21 00:24:06,070 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-21 00:24:06,070 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-21 00:24:06,070 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-21 00:24:06,070 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2021-11-21 00:24:06,070 INFO L87 Difference]: Start difference. First operand 172 states and 212 transitions. Second operand has 8 states, 8 states have (on average 4.25) internal successors, (34), 8 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:24:06,264 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:24:06,264 INFO L93 Difference]: Finished difference Result 181 states and 219 transitions. [2021-11-21 00:24:06,264 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 00:24:06,265 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.25) internal successors, (34), 8 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-11-21 00:24:06,265 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:24:06,266 INFO L225 Difference]: With dead ends: 181 [2021-11-21 00:24:06,266 INFO L226 Difference]: Without dead ends: 181 [2021-11-21 00:24:06,266 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2021-11-21 00:24:06,267 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 33 mSDsluCounter, 121 mSDsCounter, 0 mSdLazyCounter, 106 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 152 SdHoareTripleChecker+Invalid, 108 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 106 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:24:06,267 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 152 Invalid, 108 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 106 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 00:24:06,268 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 181 states. [2021-11-21 00:24:06,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 181 to 171. [2021-11-21 00:24:06,271 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 171 states, 159 states have (on average 1.320754716981132) internal successors, (210), 170 states have internal predecessors, (210), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:24:06,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 210 transitions. [2021-11-21 00:24:06,271 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 210 transitions. Word has length 20 [2021-11-21 00:24:06,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:24:06,272 INFO L470 AbstractCegarLoop]: Abstraction has 171 states and 210 transitions. [2021-11-21 00:24:06,272 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 4.25) internal successors, (34), 8 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:24:06,272 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 210 transitions. [2021-11-21 00:24:06,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-21 00:24:06,272 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:24:06,272 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:24:06,284 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (48)] Forceful destruction successful, exit code 0 [2021-11-21 00:24:06,473 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 [2021-11-21 00:24:06,473 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 19 more)] === [2021-11-21 00:24:06,473 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:24:06,473 INFO L85 PathProgramCache]: Analyzing trace with hash 211866257, now seen corresponding path program 5 times [2021-11-21 00:24:06,474 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-21 00:24:06,474 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1996562263] [2021-11-21 00:24:06,474 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-21 00:24:06,474 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-21 00:24:06,474 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-21 00:24:06,475 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-21 00:24:06,476 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (49)] Waiting until timeout for monitored process [2021-11-21 00:24:06,525 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-11-21 00:24:06,525 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:24:06,528 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-21 00:24:06,528 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:24:06,573 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-21 00:24:06,573 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 19 [2021-11-21 00:24:06,575 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 18 [2021-11-21 00:24:06,930 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:24:06,930 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:24:07,876 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:24:07,876 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-21 00:24:07,876 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1996562263] [2021-11-21 00:24:07,876 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1996562263] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:24:07,876 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [836877389] [2021-11-21 00:24:07,876 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-21 00:24:07,876 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-21 00:24:07,877 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 [2021-11-21 00:24:07,882 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-21 00:24:07,883 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (50)] Waiting until timeout for monitored process [2021-11-21 00:24:07,980 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-11-21 00:24:07,980 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:24:07,981 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-21 00:24:07,982 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:24:08,010 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-21 00:24:08,010 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 20 treesize of output 21 [2021-11-21 00:24:08,013 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 20 [2021-11-21 00:24:08,274 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:24:08,274 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:24:10,309 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:24:10,309 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [836877389] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:24:10,309 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [861201341] [2021-11-21 00:24:10,310 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-21 00:24:10,310 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:24:10,310 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:24:10,316 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:24:10,322 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Waiting until timeout for monitored process [2021-11-21 00:24:10,372 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-11-21 00:24:10,372 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:24:10,374 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-21 00:24:10,375 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:24:10,415 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-21 00:24:10,415 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 00:24:10,793 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:24:10,793 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:24:11,623 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:24:11,623 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [861201341] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:24:11,623 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-21 00:24:11,623 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10, 12, 10, 11] total 35 [2021-11-21 00:24:11,623 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1977152506] [2021-11-21 00:24:11,623 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-21 00:24:11,624 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-11-21 00:24:11,624 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-21 00:24:11,624 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-11-21 00:24:11,625 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=209, Invalid=1051, Unknown=0, NotChecked=0, Total=1260 [2021-11-21 00:24:11,625 INFO L87 Difference]: Start difference. First operand 171 states and 210 transitions. Second operand has 36 states, 35 states have (on average 2.2) internal successors, (77), 36 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:24:19,786 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:24:19,786 INFO L93 Difference]: Finished difference Result 277 states and 317 transitions. [2021-11-21 00:24:19,788 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2021-11-21 00:24:19,789 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 35 states have (on average 2.2) internal successors, (77), 36 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-11-21 00:24:19,789 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:24:19,790 INFO L225 Difference]: With dead ends: 277 [2021-11-21 00:24:19,790 INFO L226 Difference]: Without dead ends: 277 [2021-11-21 00:24:19,792 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 82 SyntacticMatches, 0 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1292 ImplicationChecksByTransitivity, 8.6s TimeCoverageRelationStatistics Valid=631, Invalid=4199, Unknown=0, NotChecked=0, Total=4830 [2021-11-21 00:24:19,793 INFO L933 BasicCegarLoop]: 73 mSDtfsCounter, 401 mSDsluCounter, 662 mSDsCounter, 0 mSdLazyCounter, 797 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 401 SdHoareTripleChecker+Valid, 735 SdHoareTripleChecker+Invalid, 1003 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 797 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 172 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-21 00:24:19,793 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [401 Valid, 735 Invalid, 1003 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 797 Invalid, 0 Unknown, 172 Unchecked, 2.4s Time] [2021-11-21 00:24:19,793 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 277 states. [2021-11-21 00:24:19,797 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 277 to 197. [2021-11-21 00:24:19,797 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 197 states, 185 states have (on average 1.318918918918919) internal successors, (244), 196 states have internal predecessors, (244), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:24:19,798 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 197 states to 197 states and 244 transitions. [2021-11-21 00:24:19,798 INFO L78 Accepts]: Start accepts. Automaton has 197 states and 244 transitions. Word has length 20 [2021-11-21 00:24:19,798 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:24:19,798 INFO L470 AbstractCegarLoop]: Abstraction has 197 states and 244 transitions. [2021-11-21 00:24:19,799 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 35 states have (on average 2.2) internal successors, (77), 36 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:24:19,799 INFO L276 IsEmpty]: Start isEmpty. Operand 197 states and 244 transitions. [2021-11-21 00:24:19,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-21 00:24:19,800 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:24:19,800 INFO L514 BasicCegarLoop]: trace histogram [4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:24:19,813 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (49)] Forceful destruction successful, exit code 0 [2021-11-21 00:24:20,011 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (50)] Ended with exit code 0 [2021-11-21 00:24:20,230 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Ended with exit code 0 [2021-11-21 00:24:20,411 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3,50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt,51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:24:20,411 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 19 more)] === [2021-11-21 00:24:20,411 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:24:20,411 INFO L85 PathProgramCache]: Analyzing trace with hash 1325244346, now seen corresponding path program 3 times [2021-11-21 00:24:20,412 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-21 00:24:20,412 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1043438725] [2021-11-21 00:24:20,412 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:24:20,412 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-21 00:24:20,412 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-21 00:24:20,413 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-21 00:24:20,416 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (52)] Waiting until timeout for monitored process [2021-11-21 00:24:20,452 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-21 00:24:20,452 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:24:20,454 INFO L263 TraceCheckSpWp]: Trace formula consists of 56 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-21 00:24:20,455 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:24:20,496 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-21 00:24:20,496 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 15 [2021-11-21 00:24:20,800 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-21 00:24:20,801 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:24:21,443 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-21 00:24:21,443 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-21 00:24:21,443 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1043438725] [2021-11-21 00:24:21,443 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1043438725] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-21 00:24:21,443 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:24:21,443 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [] total 11 [2021-11-21 00:24:21,444 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [949832342] [2021-11-21 00:24:21,444 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-21 00:24:21,444 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-21 00:24:21,444 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-21 00:24:21,445 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-21 00:24:21,445 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=90, Unknown=0, NotChecked=0, Total=132 [2021-11-21 00:24:21,445 INFO L87 Difference]: Start difference. First operand 197 states and 244 transitions. Second operand has 12 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 12 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:24:22,193 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:24:22,193 INFO L93 Difference]: Finished difference Result 212 states and 258 transitions. [2021-11-21 00:24:22,193 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-21 00:24:22,194 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 12 states have internal predecessors, (27), 0 states have call successors, (0), 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 20 [2021-11-21 00:24:22,194 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:24:22,195 INFO L225 Difference]: With dead ends: 212 [2021-11-21 00:24:22,195 INFO L226 Difference]: Without dead ends: 212 [2021-11-21 00:24:22,195 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=83, Invalid=157, Unknown=0, NotChecked=0, Total=240 [2021-11-21 00:24:22,195 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 147 mSDsluCounter, 74 mSDsCounter, 0 mSdLazyCounter, 140 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 147 SdHoareTripleChecker+Valid, 93 SdHoareTripleChecker+Invalid, 180 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 140 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 22 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-21 00:24:22,196 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [147 Valid, 93 Invalid, 180 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 140 Invalid, 0 Unknown, 22 Unchecked, 0.5s Time] [2021-11-21 00:24:22,197 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 212 states. [2021-11-21 00:24:22,200 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 212 to 186. [2021-11-21 00:24:22,200 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 186 states, 174 states have (on average 1.3160919540229885) internal successors, (229), 185 states have internal predecessors, (229), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:24:22,201 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 186 states to 186 states and 229 transitions. [2021-11-21 00:24:22,201 INFO L78 Accepts]: Start accepts. Automaton has 186 states and 229 transitions. Word has length 20 [2021-11-21 00:24:22,202 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:24:22,202 INFO L470 AbstractCegarLoop]: Abstraction has 186 states and 229 transitions. [2021-11-21 00:24:22,202 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 12 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:24:22,202 INFO L276 IsEmpty]: Start isEmpty. Operand 186 states and 229 transitions. [2021-11-21 00:24:22,203 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-21 00:24:22,203 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:24:22,203 INFO L514 BasicCegarLoop]: trace histogram [6, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:24:22,219 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (52)] Ended with exit code 0 [2021-11-21 00:24:22,413 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 [2021-11-21 00:24:22,414 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 19 more)] === [2021-11-21 00:24:22,414 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:24:22,414 INFO L85 PathProgramCache]: Analyzing trace with hash 1304271055, now seen corresponding path program 6 times [2021-11-21 00:24:22,414 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-21 00:24:22,414 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2110923227] [2021-11-21 00:24:22,414 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-21 00:24:22,414 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-21 00:24:22,415 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-21 00:24:22,415 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-21 00:24:22,416 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (53)] Waiting until timeout for monitored process [2021-11-21 00:24:22,473 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-11-21 00:24:22,473 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:24:22,476 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-21 00:24:22,477 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:24:22,565 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-21 00:24:22,565 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 19 [2021-11-21 00:24:22,568 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 18 [2021-11-21 00:24:22,845 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:24:22,845 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:24:23,950 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:24:23,950 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-21 00:24:23,951 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2110923227] [2021-11-21 00:24:23,951 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2110923227] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:24:23,951 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1285266225] [2021-11-21 00:24:23,951 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-21 00:24:23,951 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-21 00:24:23,951 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 [2021-11-21 00:24:23,952 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-21 00:24:23,953 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (54)] Waiting until timeout for monitored process [2021-11-21 00:24:24,048 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-11-21 00:24:24,048 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:24:24,050 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-21 00:24:24,050 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:24:24,087 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-21 00:24:24,087 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 19 [2021-11-21 00:24:24,091 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 18 [2021-11-21 00:24:24,261 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:24:24,261 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:24:26,493 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:24:26,493 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1285266225] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:24:26,493 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [339228874] [2021-11-21 00:24:26,493 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-21 00:24:26,494 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:24:26,494 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:24:26,516 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:24:26,549 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Waiting until timeout for monitored process [2021-11-21 00:24:26,604 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-11-21 00:24:26,604 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:24:26,607 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-21 00:24:26,607 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:24:26,668 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-21 00:24:26,668 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 22 treesize of output 23 [2021-11-21 00:24:26,671 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 22 [2021-11-21 00:24:26,960 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:24:26,961 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:24:29,391 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:24:29,391 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [339228874] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:24:29,392 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-21 00:24:29,392 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12, 13, 13, 14] total 46 [2021-11-21 00:24:29,392 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1537871297] [2021-11-21 00:24:29,392 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-21 00:24:29,392 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2021-11-21 00:24:29,392 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-21 00:24:29,393 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-11-21 00:24:29,394 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=385, Invalid=1777, Unknown=0, NotChecked=0, Total=2162 [2021-11-21 00:24:29,394 INFO L87 Difference]: Start difference. First operand 186 states and 229 transitions. Second operand has 47 states, 46 states have (on average 1.6304347826086956) internal successors, (75), 47 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:24:54,212 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.11s for a HTC check with result VALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:25:20,612 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.02s for a HTC check with result VALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:25:23,984 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.05s for a HTC check with result VALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:25:29,666 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.08s for a HTC check with result VALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:25:33,008 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.21s for a HTC check with result VALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:25:36,263 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.05s for a HTC check with result VALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:25:40,268 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.15s for a HTC check with result VALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:25:41,781 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.12s for a HTC check with result VALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:25:43,209 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:25:43,209 INFO L93 Difference]: Finished difference Result 1319 states and 1381 transitions. [2021-11-21 00:25:43,217 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 134 states. [2021-11-21 00:25:43,217 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 46 states have (on average 1.6304347826086956) internal successors, (75), 47 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-11-21 00:25:43,217 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:25:43,222 INFO L225 Difference]: With dead ends: 1319 [2021-11-21 00:25:43,222 INFO L226 Difference]: Without dead ends: 1319 [2021-11-21 00:25:43,230 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 70 SyntacticMatches, 12 SemanticMatches, 163 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9727 ImplicationChecksByTransitivity, 45.1s TimeCoverageRelationStatistics Valid=5445, Invalid=21615, Unknown=0, NotChecked=0, Total=27060 [2021-11-21 00:25:43,230 INFO L933 BasicCegarLoop]: 104 mSDtfsCounter, 6251 mSDsluCounter, 1575 mSDsCounter, 0 mSdLazyCounter, 2723 mSolverCounterSat, 502 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 32.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6251 SdHoareTripleChecker+Valid, 1679 SdHoareTripleChecker+Invalid, 3856 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 502 IncrementalHoareTripleChecker+Valid, 2723 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 631 IncrementalHoareTripleChecker+Unchecked, 33.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:25:43,231 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6251 Valid, 1679 Invalid, 3856 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [502 Valid, 2723 Invalid, 0 Unknown, 631 Unchecked, 33.2s Time] [2021-11-21 00:25:43,232 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1319 states. [2021-11-21 00:25:43,241 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1319 to 193. [2021-11-21 00:25:43,241 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 193 states, 181 states have (on average 1.3038674033149171) internal successors, (236), 192 states have internal predecessors, (236), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:25:43,242 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 193 states and 236 transitions. [2021-11-21 00:25:43,242 INFO L78 Accepts]: Start accepts. Automaton has 193 states and 236 transitions. Word has length 20 [2021-11-21 00:25:43,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:25:43,242 INFO L470 AbstractCegarLoop]: Abstraction has 193 states and 236 transitions. [2021-11-21 00:25:43,243 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 46 states have (on average 1.6304347826086956) internal successors, (75), 47 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:25:43,243 INFO L276 IsEmpty]: Start isEmpty. Operand 193 states and 236 transitions. [2021-11-21 00:25:43,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-21 00:25:43,244 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:25:43,244 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:25:43,255 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (53)] Forceful destruction successful, exit code 0 [2021-11-21 00:25:43,479 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Forceful destruction successful, exit code 0 [2021-11-21 00:25:43,656 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (54)] Forceful destruction successful, exit code 0 [2021-11-21 00:25:43,855 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3,55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt [2021-11-21 00:25:43,855 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr20ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 19 more)] === [2021-11-21 00:25:43,855 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:25:43,855 INFO L85 PathProgramCache]: Analyzing trace with hash -1977019983, now seen corresponding path program 1 times [2021-11-21 00:25:43,856 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-21 00:25:43,856 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1227464350] [2021-11-21 00:25:43,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:25:43,856 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-21 00:25:43,856 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-21 00:25:43,858 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-21 00:25:43,859 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (56)] Waiting until timeout for monitored process [2021-11-21 00:25:43,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:25:43,905 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-21 00:25:43,906 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:25:44,006 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 00:25:44,006 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:25:44,082 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 00:25:44,082 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-21 00:25:44,082 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1227464350] [2021-11-21 00:25:44,083 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1227464350] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-21 00:25:44,083 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:25:44,083 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 4 [2021-11-21 00:25:44,083 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1071704574] [2021-11-21 00:25:44,083 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-21 00:25:44,083 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 00:25:44,083 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-21 00:25:44,084 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 00:25:44,084 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-21 00:25:44,084 INFO L87 Difference]: Start difference. First operand 193 states and 236 transitions. Second operand has 5 states, 4 states have (on average 10.5) internal successors, (42), 5 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:25:44,132 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:25:44,132 INFO L93 Difference]: Finished difference Result 192 states and 235 transitions. [2021-11-21 00:25:44,133 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 00:25:44,133 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 10.5) internal successors, (42), 5 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-11-21 00:25:44,133 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:25:44,134 INFO L225 Difference]: With dead ends: 192 [2021-11-21 00:25:44,134 INFO L226 Difference]: Without dead ends: 192 [2021-11-21 00:25:44,134 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-21 00:25:44,135 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 61 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:25:44,135 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [61 Valid, 33 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:25:44,135 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 192 states. [2021-11-21 00:25:44,138 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 192 to 192. [2021-11-21 00:25:44,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 192 states, 181 states have (on average 1.298342541436464) internal successors, (235), 191 states have internal predecessors, (235), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:25:44,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 235 transitions. [2021-11-21 00:25:44,140 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 235 transitions. Word has length 21 [2021-11-21 00:25:44,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:25:44,140 INFO L470 AbstractCegarLoop]: Abstraction has 192 states and 235 transitions. [2021-11-21 00:25:44,140 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 10.5) internal successors, (42), 5 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:25:44,141 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 235 transitions. [2021-11-21 00:25:44,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-21 00:25:44,141 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:25:44,142 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:25:44,172 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (56)] Forceful destruction successful, exit code 0 [2021-11-21 00:25:44,354 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 [2021-11-21 00:25:44,354 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr21ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 19 more)] === [2021-11-21 00:25:44,354 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:25:44,354 INFO L85 PathProgramCache]: Analyzing trace with hash -1158077211, now seen corresponding path program 1 times [2021-11-21 00:25:44,355 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-21 00:25:44,355 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1416624222] [2021-11-21 00:25:44,355 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:25:44,355 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-21 00:25:44,356 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-21 00:25:44,357 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-21 00:25:44,360 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (57)] Waiting until timeout for monitored process [2021-11-21 00:25:44,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:25:44,409 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-21 00:25:44,410 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:25:44,426 INFO L354 Elim1Store]: treesize reduction 12, result has 40.0 percent of original size [2021-11-21 00:25:44,426 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 20 treesize of output 22 [2021-11-21 00:25:44,623 INFO L354 Elim1Store]: treesize reduction 20, result has 28.6 percent of original size [2021-11-21 00:25:44,624 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 32 treesize of output 35 [2021-11-21 00:25:44,705 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 00:25:44,705 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:25:46,836 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 00:25:46,836 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-21 00:25:46,836 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1416624222] [2021-11-21 00:25:46,836 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1416624222] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-21 00:25:46,837 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:25:46,837 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 5 [2021-11-21 00:25:46,837 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1647358312] [2021-11-21 00:25:46,837 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-21 00:25:46,837 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-21 00:25:46,838 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-21 00:25:46,838 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-21 00:25:46,838 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=16, Unknown=1, NotChecked=0, Total=30 [2021-11-21 00:25:46,839 INFO L87 Difference]: Start difference. First operand 192 states and 235 transitions. Second operand has 6 states, 5 states have (on average 8.2) internal successors, (41), 6 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:25:52,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:25:52,951 INFO L93 Difference]: Finished difference Result 191 states and 234 transitions. [2021-11-21 00:25:52,952 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 00:25:52,952 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 8.2) internal successors, (41), 6 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-11-21 00:25:52,952 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:25:52,953 INFO L225 Difference]: With dead ends: 191 [2021-11-21 00:25:52,953 INFO L226 Difference]: Without dead ends: 191 [2021-11-21 00:25:52,953 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 8.1s TimeCoverageRelationStatistics Valid=18, Invalid=22, Unknown=2, NotChecked=0, Total=42 [2021-11-21 00:25:52,953 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 33 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 16 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:25:52,953 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 51 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 21 Invalid, 0 Unknown, 16 Unchecked, 0.1s Time] [2021-11-21 00:25:52,954 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 191 states. [2021-11-21 00:25:52,957 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 191 to 191. [2021-11-21 00:25:52,957 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 191 states, 181 states have (on average 1.292817679558011) internal successors, (234), 190 states have internal predecessors, (234), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:25:52,958 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 191 states to 191 states and 234 transitions. [2021-11-21 00:25:52,958 INFO L78 Accepts]: Start accepts. Automaton has 191 states and 234 transitions. Word has length 22 [2021-11-21 00:25:52,959 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:25:52,959 INFO L470 AbstractCegarLoop]: Abstraction has 191 states and 234 transitions. [2021-11-21 00:25:52,959 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 8.2) internal successors, (41), 6 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:25:52,959 INFO L276 IsEmpty]: Start isEmpty. Operand 191 states and 234 transitions. [2021-11-21 00:25:52,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-21 00:25:52,960 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:25:52,960 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:25:52,975 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (57)] Forceful destruction successful, exit code 0 [2021-11-21 00:25:53,171 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 [2021-11-21 00:25:53,171 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 19 more)] === [2021-11-21 00:25:53,171 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:25:53,171 INFO L85 PathProgramCache]: Analyzing trace with hash 205674071, now seen corresponding path program 1 times [2021-11-21 00:25:53,171 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-21 00:25:53,172 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1459272642] [2021-11-21 00:25:53,172 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:25:53,172 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-21 00:25:53,172 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-21 00:25:53,172 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-21 00:25:53,177 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (58)] Waiting until timeout for monitored process [2021-11-21 00:25:53,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:25:53,218 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-21 00:25:53,219 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:25:53,355 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-21 00:25:53,355 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:25:53,620 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-21 00:25:53,621 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-21 00:25:53,621 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1459272642] [2021-11-21 00:25:53,621 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1459272642] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:25:53,621 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1394677092] [2021-11-21 00:25:53,621 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:25:53,622 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-21 00:25:53,622 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 [2021-11-21 00:25:53,627 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-21 00:25:53,646 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (59)] Waiting until timeout for monitored process [2021-11-21 00:25:53,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:25:53,774 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-21 00:25:53,775 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:25:53,872 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-21 00:25:53,873 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:25:53,948 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-21 00:25:53,948 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1394677092] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:25:53,948 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [63638590] [2021-11-21 00:25:53,948 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:25:53,948 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:25:53,949 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:25:53,951 INFO L229 MonitoredProcess]: Starting monitored process 60 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:25:53,966 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Waiting until timeout for monitored process [2021-11-21 00:25:54,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:25:54,013 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-21 00:25:54,014 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:25:54,048 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-21 00:25:54,048 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 00:25:54,229 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-21 00:25:54,229 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:25:55,292 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-21 00:25:55,292 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [63638590] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:25:55,293 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-21 00:25:55,293 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 8, 9] total 27 [2021-11-21 00:25:55,293 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1621716407] [2021-11-21 00:25:55,293 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-21 00:25:55,293 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-21 00:25:55,293 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-21 00:25:55,294 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-21 00:25:55,294 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=577, Unknown=0, NotChecked=0, Total=702 [2021-11-21 00:25:55,294 INFO L87 Difference]: Start difference. First operand 191 states and 234 transitions. Second operand has 27 states, 27 states have (on average 2.4814814814814814) internal successors, (67), 27 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:26:01,657 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:26:01,658 INFO L93 Difference]: Finished difference Result 296 states and 335 transitions. [2021-11-21 00:26:01,658 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-11-21 00:26:01,658 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 2.4814814814814814) internal successors, (67), 27 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-11-21 00:26:01,658 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:26:01,660 INFO L225 Difference]: With dead ends: 296 [2021-11-21 00:26:01,660 INFO L226 Difference]: Without dead ends: 296 [2021-11-21 00:26:01,661 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 101 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 599 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=713, Invalid=2367, Unknown=0, NotChecked=0, Total=3080 [2021-11-21 00:26:01,662 INFO L933 BasicCegarLoop]: 61 mSDtfsCounter, 1102 mSDsluCounter, 523 mSDsCounter, 0 mSdLazyCounter, 993 mSolverCounterSat, 169 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1102 SdHoareTripleChecker+Valid, 584 SdHoareTripleChecker+Invalid, 1162 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 169 IncrementalHoareTripleChecker+Valid, 993 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:26:01,663 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1102 Valid, 584 Invalid, 1162 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [169 Valid, 993 Invalid, 0 Unknown, 0 Unchecked, 2.2s Time] [2021-11-21 00:26:01,663 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 296 states. [2021-11-21 00:26:01,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 296 to 230. [2021-11-21 00:26:01,668 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 230 states, 220 states have (on average 1.2636363636363637) internal successors, (278), 229 states have internal predecessors, (278), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:26:01,669 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 230 states to 230 states and 278 transitions. [2021-11-21 00:26:01,670 INFO L78 Accepts]: Start accepts. Automaton has 230 states and 278 transitions. Word has length 22 [2021-11-21 00:26:01,670 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:26:01,670 INFO L470 AbstractCegarLoop]: Abstraction has 230 states and 278 transitions. [2021-11-21 00:26:01,670 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 2.4814814814814814) internal successors, (67), 27 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:26:01,671 INFO L276 IsEmpty]: Start isEmpty. Operand 230 states and 278 transitions. [2021-11-21 00:26:01,671 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-21 00:26:01,671 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:26:01,672 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:26:01,678 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (59)] Forceful destruction successful, exit code 0 [2021-11-21 00:26:01,900 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Forceful destruction successful, exit code 0 [2021-11-21 00:26:02,082 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (58)] Ended with exit code 0 [2021-11-21 00:26:02,274 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 59 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt,60 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,58 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 [2021-11-21 00:26:02,275 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 19 more)] === [2021-11-21 00:26:02,275 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:26:02,275 INFO L85 PathProgramCache]: Analyzing trace with hash -1894290796, now seen corresponding path program 7 times [2021-11-21 00:26:02,275 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-21 00:26:02,275 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1486592373] [2021-11-21 00:26:02,275 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:26:02,276 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-21 00:26:02,276 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-21 00:26:02,276 INFO L229 MonitoredProcess]: Starting monitored process 61 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-21 00:26:02,278 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (61)] Waiting until timeout for monitored process [2021-11-21 00:26:02,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:26:02,322 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-21 00:26:02,322 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:26:02,459 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 4 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:26:02,459 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:26:02,718 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 4 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:26:02,718 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-21 00:26:02,719 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1486592373] [2021-11-21 00:26:02,719 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1486592373] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:26:02,719 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2025923305] [2021-11-21 00:26:02,719 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:26:02,719 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-21 00:26:02,719 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 [2021-11-21 00:26:02,721 INFO L229 MonitoredProcess]: Starting monitored process 62 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-21 00:26:02,723 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (62)] Waiting until timeout for monitored process [2021-11-21 00:26:02,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:26:02,826 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-21 00:26:02,827 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:26:02,949 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 4 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:26:02,949 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:26:03,019 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 4 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:26:03,020 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2025923305] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:26:03,020 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [328047467] [2021-11-21 00:26:03,020 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:26:03,020 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:26:03,020 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:26:03,021 INFO L229 MonitoredProcess]: Starting monitored process 63 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:26:03,022 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Waiting until timeout for monitored process [2021-11-21 00:26:03,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:26:03,076 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-21 00:26:03,076 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:26:03,156 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 4 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:26:03,157 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:26:03,233 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 4 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:26:03,233 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [328047467] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:26:03,233 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-21 00:26:03,233 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11, 11, 11, 11] total 20 [2021-11-21 00:26:03,233 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [447352827] [2021-11-21 00:26:03,233 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-21 00:26:03,234 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-21 00:26:03,234 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-21 00:26:03,234 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-21 00:26:03,234 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=308, Unknown=0, NotChecked=0, Total=380 [2021-11-21 00:26:03,235 INFO L87 Difference]: Start difference. First operand 230 states and 278 transitions. Second operand has 20 states, 20 states have (on average 2.2) internal successors, (44), 20 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:26:04,447 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:26:04,447 INFO L93 Difference]: Finished difference Result 276 states and 308 transitions. [2021-11-21 00:26:04,448 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-21 00:26:04,449 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.2) internal successors, (44), 20 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2021-11-21 00:26:04,449 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:26:04,450 INFO L225 Difference]: With dead ends: 276 [2021-11-21 00:26:04,450 INFO L226 Difference]: Without dead ends: 276 [2021-11-21 00:26:04,451 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 114 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 200 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=201, Invalid=855, Unknown=0, NotChecked=0, Total=1056 [2021-11-21 00:26:04,451 INFO L933 BasicCegarLoop]: 80 mSDtfsCounter, 445 mSDsluCounter, 819 mSDsCounter, 0 mSdLazyCounter, 909 mSolverCounterSat, 59 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 445 SdHoareTripleChecker+Valid, 899 SdHoareTripleChecker+Invalid, 968 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 59 IncrementalHoareTripleChecker+Valid, 909 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-21 00:26:04,452 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [445 Valid, 899 Invalid, 968 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [59 Valid, 909 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-21 00:26:04,452 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 276 states. [2021-11-21 00:26:04,455 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 276 to 209. [2021-11-21 00:26:04,456 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 209 states, 199 states have (on average 1.2412060301507537) internal successors, (247), 208 states have internal predecessors, (247), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:26:04,457 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 209 states to 209 states and 247 transitions. [2021-11-21 00:26:04,457 INFO L78 Accepts]: Start accepts. Automaton has 209 states and 247 transitions. Word has length 23 [2021-11-21 00:26:04,457 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:26:04,457 INFO L470 AbstractCegarLoop]: Abstraction has 209 states and 247 transitions. [2021-11-21 00:26:04,458 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 2.2) internal successors, (44), 20 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:26:04,458 INFO L276 IsEmpty]: Start isEmpty. Operand 209 states and 247 transitions. [2021-11-21 00:26:04,459 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-21 00:26:04,459 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:26:04,459 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:26:04,504 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Ended with exit code 0 [2021-11-21 00:26:04,688 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (61)] Forceful destruction successful, exit code 0 [2021-11-21 00:26:04,874 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (62)] Ended with exit code 0 [2021-11-21 00:26:05,072 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 63 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,61 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3,62 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt [2021-11-21 00:26:05,073 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr22ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 19 more)] === [2021-11-21 00:26:05,073 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:26:05,073 INFO L85 PathProgramCache]: Analyzing trace with hash -515666264, now seen corresponding path program 1 times [2021-11-21 00:26:05,073 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-21 00:26:05,073 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1430880340] [2021-11-21 00:26:05,074 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:26:05,074 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-21 00:26:05,074 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-21 00:26:05,075 INFO L229 MonitoredProcess]: Starting monitored process 64 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-21 00:26:05,081 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (64)] Waiting until timeout for monitored process [2021-11-21 00:26:05,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:26:05,163 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-21 00:26:05,163 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:26:07,462 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 00:26:07,462 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:26:10,269 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 00:26:10,270 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-21 00:26:10,270 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1430880340] [2021-11-21 00:26:10,270 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1430880340] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-21 00:26:10,270 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:26:10,270 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [] total 8 [2021-11-21 00:26:10,270 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1619545561] [2021-11-21 00:26:10,270 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-21 00:26:10,271 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-21 00:26:10,271 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-21 00:26:10,271 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-21 00:26:10,271 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=50, Unknown=2, NotChecked=0, Total=72 [2021-11-21 00:26:10,272 INFO L87 Difference]: Start difference. First operand 209 states and 247 transitions. Second operand has 9 states, 8 states have (on average 5.875) internal successors, (47), 9 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:26:10,374 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:26:10,374 INFO L93 Difference]: Finished difference Result 208 states and 246 transitions. [2021-11-21 00:26:10,375 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-21 00:26:10,375 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 5.875) internal successors, (47), 9 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-11-21 00:26:10,375 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:26:10,376 INFO L225 Difference]: With dead ends: 208 [2021-11-21 00:26:10,376 INFO L226 Difference]: Without dead ends: 187 [2021-11-21 00:26:10,377 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=25, Invalid=63, Unknown=2, NotChecked=0, Total=90 [2021-11-21 00:26:10,377 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 19 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 111 SdHoareTripleChecker+Invalid, 72 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 35 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:26:10,377 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 111 Invalid, 72 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 35 Invalid, 0 Unknown, 35 Unchecked, 0.1s Time] [2021-11-21 00:26:10,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2021-11-21 00:26:10,380 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 187. [2021-11-21 00:26:10,381 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 187 states, 178 states have (on average 1.252808988764045) internal successors, (223), 186 states have internal predecessors, (223), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:26:10,381 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 223 transitions. [2021-11-21 00:26:10,381 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 223 transitions. Word has length 24 [2021-11-21 00:26:10,381 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:26:10,382 INFO L470 AbstractCegarLoop]: Abstraction has 187 states and 223 transitions. [2021-11-21 00:26:10,382 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 5.875) internal successors, (47), 9 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:26:10,382 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 223 transitions. [2021-11-21 00:26:10,382 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-21 00:26:10,382 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:26:10,382 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:26:10,391 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (64)] Forceful destruction successful, exit code 0 [2021-11-21 00:26:10,583 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 64 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 [2021-11-21 00:26:10,583 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr16ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 19 more)] === [2021-11-21 00:26:10,583 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:26:10,583 INFO L85 PathProgramCache]: Analyzing trace with hash -1415268989, now seen corresponding path program 1 times [2021-11-21 00:26:10,584 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-21 00:26:10,584 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [404695726] [2021-11-21 00:26:10,584 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:26:10,584 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-21 00:26:10,584 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-21 00:26:10,585 INFO L229 MonitoredProcess]: Starting monitored process 65 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-21 00:26:10,589 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (65)] Waiting until timeout for monitored process [2021-11-21 00:26:10,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:26:10,667 INFO L263 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-21 00:26:10,667 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:26:10,721 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-21 00:26:10,722 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:26:10,764 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-21 00:26:10,764 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-21 00:26:10,764 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [404695726] [2021-11-21 00:26:10,764 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [404695726] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-21 00:26:10,764 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:26:10,765 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 2 [2021-11-21 00:26:10,765 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [590732230] [2021-11-21 00:26:10,765 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-21 00:26:10,765 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:26:10,765 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-21 00:26:10,766 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:26:10,766 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:26:10,766 INFO L87 Difference]: Start difference. First operand 187 states and 223 transitions. Second operand has 3 states, 2 states have (on average 10.5) internal successors, (21), 3 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:26:10,779 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:26:10,779 INFO L93 Difference]: Finished difference Result 185 states and 220 transitions. [2021-11-21 00:26:10,779 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:26:10,779 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 10.5) internal successors, (21), 3 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-11-21 00:26:10,779 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:26:10,780 INFO L225 Difference]: With dead ends: 185 [2021-11-21 00:26:10,780 INFO L226 Difference]: Without dead ends: 184 [2021-11-21 00:26:10,780 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:26:10,781 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 17 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 6 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 4 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:26:10,781 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 30 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:26:10,781 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2021-11-21 00:26:10,783 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 184. [2021-11-21 00:26:10,784 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 184 states, 177 states have (on average 1.2372881355932204) internal successors, (219), 183 states have internal predecessors, (219), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:26:10,784 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 219 transitions. [2021-11-21 00:26:10,785 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 219 transitions. Word has length 24 [2021-11-21 00:26:10,785 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:26:10,785 INFO L470 AbstractCegarLoop]: Abstraction has 184 states and 219 transitions. [2021-11-21 00:26:10,785 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 10.5) internal successors, (21), 3 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:26:10,785 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 219 transitions. [2021-11-21 00:26:10,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-21 00:26:10,786 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:26:10,786 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:26:10,818 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (65)] Forceful destruction successful, exit code 0 [2021-11-21 00:26:10,999 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 65 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 [2021-11-21 00:26:10,999 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 19 more)] === [2021-11-21 00:26:11,000 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:26:11,000 INFO L85 PathProgramCache]: Analyzing trace with hash 1717365455, now seen corresponding path program 8 times [2021-11-21 00:26:11,000 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-21 00:26:11,000 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1999254447] [2021-11-21 00:26:11,000 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-21 00:26:11,000 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-21 00:26:11,000 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-21 00:26:11,001 INFO L229 MonitoredProcess]: Starting monitored process 66 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-21 00:26:11,002 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (66)] Waiting until timeout for monitored process [2021-11-21 00:26:11,052 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-21 00:26:11,052 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:26:11,055 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-21 00:26:11,056 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:26:11,100 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-21 00:26:11,100 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 20 treesize of output 21 [2021-11-21 00:26:11,102 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 20 [2021-11-21 00:26:11,570 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:26:11,570 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:26:13,758 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:26:13,758 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-21 00:26:13,758 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1999254447] [2021-11-21 00:26:13,758 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1999254447] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:26:13,758 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1620133985] [2021-11-21 00:26:13,759 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-21 00:26:13,759 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-21 00:26:13,759 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 [2021-11-21 00:26:13,760 INFO L229 MonitoredProcess]: Starting monitored process 67 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-21 00:26:13,761 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (67)] Waiting until timeout for monitored process [2021-11-21 00:26:13,891 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-21 00:26:13,892 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:26:13,893 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-21 00:26:13,894 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:26:13,932 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-21 00:26:13,933 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 22 [2021-11-21 00:26:13,935 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 21 [2021-11-21 00:26:14,243 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:26:14,244 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:26:14,638 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:26:14,638 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1620133985] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:26:14,638 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2015780765] [2021-11-21 00:26:14,638 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-21 00:26:14,638 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:26:14,639 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:26:14,639 INFO L229 MonitoredProcess]: Starting monitored process 68 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:26:14,642 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (68)] Waiting until timeout for monitored process [2021-11-21 00:26:14,703 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-21 00:26:14,703 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:26:14,707 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-21 00:26:14,707 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:26:14,742 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-21 00:26:14,742 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 00:26:15,177 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:26:15,177 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:26:17,776 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:26:17,776 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2015780765] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:26:17,776 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-21 00:26:17,777 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12, 12, 12, 13] total 39 [2021-11-21 00:26:17,777 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1158165757] [2021-11-21 00:26:17,777 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-21 00:26:17,778 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2021-11-21 00:26:17,778 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-21 00:26:17,778 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-11-21 00:26:17,779 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=240, Invalid=1320, Unknown=0, NotChecked=0, Total=1560 [2021-11-21 00:26:17,779 INFO L87 Difference]: Start difference. First operand 184 states and 219 transitions. Second operand has 40 states, 39 states have (on average 2.1538461538461537) internal successors, (84), 40 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:26:29,207 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.11s for a HTC check with result VALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:26:44,458 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:26:44,459 INFO L93 Difference]: Finished difference Result 367 states and 409 transitions. [2021-11-21 00:26:44,460 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2021-11-21 00:26:44,460 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 39 states have (on average 2.1538461538461537) internal successors, (84), 40 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-11-21 00:26:44,460 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:26:44,461 INFO L225 Difference]: With dead ends: 367 [2021-11-21 00:26:44,461 INFO L226 Difference]: Without dead ends: 367 [2021-11-21 00:26:44,462 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 187 GetRequests, 101 SyntacticMatches, 0 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2158 ImplicationChecksByTransitivity, 18.6s TimeCoverageRelationStatistics Valid=918, Invalid=6738, Unknown=0, NotChecked=0, Total=7656 [2021-11-21 00:26:44,462 INFO L933 BasicCegarLoop]: 34 mSDtfsCounter, 664 mSDsluCounter, 356 mSDsCounter, 0 mSdLazyCounter, 1340 mSolverCounterSat, 95 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 11.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 664 SdHoareTripleChecker+Valid, 390 SdHoareTripleChecker+Invalid, 1468 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 95 IncrementalHoareTripleChecker+Valid, 1340 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 33 IncrementalHoareTripleChecker+Unchecked, 12.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:26:44,463 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [664 Valid, 390 Invalid, 1468 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [95 Valid, 1340 Invalid, 0 Unknown, 33 Unchecked, 12.2s Time] [2021-11-21 00:26:44,463 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 367 states. [2021-11-21 00:26:44,467 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 367 to 210. [2021-11-21 00:26:44,467 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 210 states, 203 states have (on average 1.2463054187192117) internal successors, (253), 209 states have internal predecessors, (253), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:26:44,468 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 210 states to 210 states and 253 transitions. [2021-11-21 00:26:44,468 INFO L78 Accepts]: Start accepts. Automaton has 210 states and 253 transitions. Word has length 24 [2021-11-21 00:26:44,468 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:26:44,469 INFO L470 AbstractCegarLoop]: Abstraction has 210 states and 253 transitions. [2021-11-21 00:26:44,469 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 39 states have (on average 2.1538461538461537) internal successors, (84), 40 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:26:44,469 INFO L276 IsEmpty]: Start isEmpty. Operand 210 states and 253 transitions. [2021-11-21 00:26:44,469 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-21 00:26:44,470 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:26:44,470 INFO L514 BasicCegarLoop]: trace histogram [13, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:26:44,494 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (66)] Ended with exit code 0 [2021-11-21 00:26:44,683 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (67)] Ended with exit code 0 [2021-11-21 00:26:44,904 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (68)] Ended with exit code 0 [2021-11-21 00:26:45,081 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 66 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3,67 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt,68 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:26:45,082 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 19 more)] === [2021-11-21 00:26:45,082 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:26:45,082 INFO L85 PathProgramCache]: Analyzing trace with hash -1758958447, now seen corresponding path program 9 times [2021-11-21 00:26:45,082 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-21 00:26:45,082 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1474675291] [2021-11-21 00:26:45,082 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:26:45,083 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-21 00:26:45,083 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-21 00:26:45,083 INFO L229 MonitoredProcess]: Starting monitored process 69 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-21 00:26:45,084 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (69)] Waiting until timeout for monitored process [2021-11-21 00:26:45,124 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-21 00:26:45,124 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:26:45,126 INFO L263 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-21 00:26:45,126 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:26:45,172 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-21 00:26:45,172 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 24 [2021-11-21 00:26:45,176 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 23 [2021-11-21 00:26:45,527 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 13 proven. 2 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-11-21 00:26:45,527 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:26:46,494 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 13 proven. 2 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-11-21 00:26:46,494 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-21 00:26:46,494 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1474675291] [2021-11-21 00:26:46,494 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1474675291] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:26:46,495 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [509435692] [2021-11-21 00:26:46,495 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:26:46,495 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-21 00:26:46,495 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 [2021-11-21 00:26:46,495 INFO L229 MonitoredProcess]: Starting monitored process 70 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-21 00:26:46,497 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (70)] Waiting until timeout for monitored process [2021-11-21 00:26:46,576 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-21 00:26:46,576 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:26:46,578 INFO L263 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-21 00:26:46,578 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:26:46,627 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-21 00:26:46,627 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 26 [2021-11-21 00:26:46,632 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 25 [2021-11-21 00:26:46,867 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 13 proven. 2 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-11-21 00:26:46,867 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:26:47,152 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 13 proven. 2 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-11-21 00:26:47,153 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [509435692] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:26:47,153 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [625867474] [2021-11-21 00:26:47,153 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:26:47,154 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:26:47,154 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:26:47,179 INFO L229 MonitoredProcess]: Starting monitored process 71 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:26:47,179 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (71)] Waiting until timeout for monitored process [2021-11-21 00:26:47,231 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-21 00:26:47,231 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:26:47,233 INFO L263 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-21 00:26:47,238 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:26:47,282 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-21 00:26:47,282 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 15 [2021-11-21 00:26:47,615 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 13 proven. 2 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-11-21 00:26:47,615 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:26:47,929 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 13 proven. 2 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-11-21 00:26:47,929 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [625867474] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:26:47,929 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-21 00:26:47,929 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8, 7, 8, 7, 8] total 19 [2021-11-21 00:26:47,929 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1829905426] [2021-11-21 00:26:47,930 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-21 00:26:47,930 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-21 00:26:47,930 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-21 00:26:47,930 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-21 00:26:47,930 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=115, Invalid=265, Unknown=0, NotChecked=0, Total=380 [2021-11-21 00:26:47,931 INFO L87 Difference]: Start difference. First operand 210 states and 253 transitions. Second operand has 20 states, 19 states have (on average 1.631578947368421) internal successors, (31), 20 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:26:49,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:26:49,058 INFO L93 Difference]: Finished difference Result 213 states and 253 transitions. [2021-11-21 00:26:49,059 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-21 00:26:49,059 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 1.631578947368421) internal successors, (31), 20 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-11-21 00:26:49,059 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:26:49,060 INFO L225 Difference]: With dead ends: 213 [2021-11-21 00:26:49,060 INFO L226 Difference]: Without dead ends: 213 [2021-11-21 00:26:49,060 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 119 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 188 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=149, Invalid=357, Unknown=0, NotChecked=0, Total=506 [2021-11-21 00:26:49,061 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 23 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 151 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 199 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 151 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 38 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-21 00:26:49,061 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 57 Invalid, 199 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 151 Invalid, 0 Unknown, 38 Unchecked, 0.7s Time] [2021-11-21 00:26:49,062 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 213 states. [2021-11-21 00:26:49,065 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 213 to 192. [2021-11-21 00:26:49,065 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 192 states, 185 states have (on average 1.2540540540540541) internal successors, (232), 191 states have internal predecessors, (232), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:26:49,066 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 232 transitions. [2021-11-21 00:26:49,066 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 232 transitions. Word has length 24 [2021-11-21 00:26:49,067 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:26:49,067 INFO L470 AbstractCegarLoop]: Abstraction has 192 states and 232 transitions. [2021-11-21 00:26:49,067 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 19 states have (on average 1.631578947368421) internal successors, (31), 20 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:26:49,067 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 232 transitions. [2021-11-21 00:26:49,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-21 00:26:49,068 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:26:49,068 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:26:49,077 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (69)] Forceful destruction successful, exit code 0 [2021-11-21 00:26:49,270 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (70)] Forceful destruction successful, exit code 0 [2021-11-21 00:26:49,488 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (71)] Ended with exit code 0 [2021-11-21 00:26:49,669 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 69 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3,70 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt,71 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:26:49,669 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr13ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 19 more)] === [2021-11-21 00:26:49,669 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:26:49,669 INFO L85 PathProgramCache]: Analyzing trace with hash 1402242559, now seen corresponding path program 1 times [2021-11-21 00:26:49,669 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-21 00:26:49,670 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [716678541] [2021-11-21 00:26:49,670 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:26:49,670 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-21 00:26:49,670 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-21 00:26:49,671 INFO L229 MonitoredProcess]: Starting monitored process 72 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-21 00:26:49,671 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e123074b-7e52-46e2-85a4-6ad4d2c5d0cf/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (72)] Waiting until timeout for monitored process [2021-11-21 00:26:49,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:26:49,764 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-21 00:26:49,765 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:26:49,792 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-21 00:26:49,839 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-21 00:26:49,911 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 24 [2021-11-21 00:26:50,641 INFO L354 Elim1Store]: treesize reduction 92, result has 18.6 percent of original size [2021-11-21 00:26:50,641 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 40 treesize of output 42 [2021-11-21 00:26:51,255 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:26:51,303 INFO L354 Elim1Store]: treesize reduction 124, result has 15.6 percent of original size [2021-11-21 00:26:51,309 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 47 treesize of output 52 [2021-11-21 00:26:52,792 INFO L354 Elim1Store]: treesize reduction 80, result has 1.2 percent of original size [2021-11-21 00:26:52,792 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 55 treesize of output 23 [2021-11-21 00:26:52,819 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:26:52,819 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:27:03,316 WARN L838 $PredicateComparison]: unable to prove that (forall ((|ULTIMATE.start_foo_~i~0#1| (_ BitVec 32)) (|v_ULTIMATE.start_foo_~i~0#1_268| (_ BitVec 32)) (~a~0.offset (_ BitVec 32))) (= (let ((.cse0 (store (select (store |c_#memory_int| c_~a~0.base (store (store (select |c_#memory_int| c_~a~0.base) (bvadd ~a~0.offset (bvmul |ULTIMATE.start_foo_~i~0#1| (_ bv4 32))) c_~n~0) (bvadd ~a~0.offset (bvmul |v_ULTIMATE.start_foo_~i~0#1_268| (_ bv4 32))) c_~n~0)) c_~b~0.base) c_~b~0.offset c_~n~0))) (bvadd (bvneg (select .cse0 (bvadd (bvmul c_~n~0 (_ bv4 32)) c_~b~0.offset (_ bv4294967288 32)))) (select .cse0 (bvadd (_ bv4294967292 32) c_~b~0.offset)))) (_ bv0 32))) is different from false [2021-11-21 00:27:03,568 INFO L354 Elim1Store]: treesize reduction 115, result has 22.3 percent of original size [2021-11-21 00:27:03,569 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 3 case distinctions, treesize of input 97 treesize of output 60 [2021-11-21 00:27:03,638 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-21 00:27:03,639 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 60 treesize of output 74 [2021-11-21 00:27:03,786 INFO L354 Elim1Store]: treesize reduction 10, result has 33.3 percent of original size [2021-11-21 00:27:03,787 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 100 treesize of output 83 [2021-11-21 00:27:04,138 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 4 [2021-11-21 00:27:04,294 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:27:04,427 INFO L354 Elim1Store]: treesize reduction 9, result has 76.9 percent of original size [2021-11-21 00:27:04,428 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 53 treesize of output 65