./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/pals_lcr.4.ufo.BOUNDED-8.pals+Problem12_label02.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 6a47aea7 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/pals_lcr.4.ufo.BOUNDED-8.pals+Problem12_label02.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 71ab165d8600c7bf3c601364205c3c131ed910663de3282b3121f676cf35500e --- Real Ultimate output --- This is Ultimate 0.2.2-dev-6a47aea [2021-11-23 17:07:06,158 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 17:07:06,163 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 17:07:06,239 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 17:07:06,240 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 17:07:06,242 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 17:07:06,245 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 17:07:06,248 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 17:07:06,252 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 17:07:06,257 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 17:07:06,259 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 17:07:06,262 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 17:07:06,265 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 17:07:06,268 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 17:07:06,278 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 17:07:06,281 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 17:07:06,291 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 17:07:06,293 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 17:07:06,296 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 17:07:06,299 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 17:07:06,303 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 17:07:06,305 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 17:07:06,308 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 17:07:06,311 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 17:07:06,320 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 17:07:06,325 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 17:07:06,326 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 17:07:06,329 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 17:07:06,330 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 17:07:06,333 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 17:07:06,334 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 17:07:06,336 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 17:07:06,339 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 17:07:06,341 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 17:07:06,344 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 17:07:06,345 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 17:07:06,346 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 17:07:06,346 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 17:07:06,347 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 17:07:06,348 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 17:07:06,349 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 17:07:06,350 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 17:07:06,404 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 17:07:06,404 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 17:07:06,405 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 17:07:06,405 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 17:07:06,406 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 17:07:06,407 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 17:07:06,407 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 17:07:06,407 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 17:07:06,408 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 17:07:06,408 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 17:07:06,408 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 17:07:06,409 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 17:07:06,409 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 17:07:06,409 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 17:07:06,410 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 17:07:06,410 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 17:07:06,410 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 17:07:06,411 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 17:07:06,412 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 17:07:06,412 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 17:07:06,412 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 17:07:06,413 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 17:07:06,413 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 17:07:06,413 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 17:07:06,414 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 17:07:06,414 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 17:07:06,414 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 17:07:06,415 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 17:07:06,415 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 17:07:06,415 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 17:07:06,416 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 17:07:06,416 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 17:07:06,416 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:07:06,417 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 17:07:06,417 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 17:07:06,417 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 17:07:06,418 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 17:07:06,418 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 17:07:06,418 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 17:07:06,418 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 17:07:06,419 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 17:07:06,419 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_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 71ab165d8600c7bf3c601364205c3c131ed910663de3282b3121f676cf35500e [2021-11-23 17:07:06,769 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 17:07:06,816 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 17:07:06,819 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 17:07:06,821 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 17:07:06,822 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 17:07:06,824 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/../../sv-benchmarks/c/combinations/pals_lcr.4.ufo.BOUNDED-8.pals+Problem12_label02.c [2021-11-23 17:07:06,913 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/data/de5dff045/a6447806fb1b4cbeaa7d4db482bb1695/FLAGf1860916f [2021-11-23 17:07:08,112 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 17:07:08,113 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/sv-benchmarks/c/combinations/pals_lcr.4.ufo.BOUNDED-8.pals+Problem12_label02.c [2021-11-23 17:07:08,158 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/data/de5dff045/a6447806fb1b4cbeaa7d4db482bb1695/FLAGf1860916f [2021-11-23 17:07:08,446 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/data/de5dff045/a6447806fb1b4cbeaa7d4db482bb1695 [2021-11-23 17:07:08,450 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 17:07:08,456 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 17:07:08,462 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 17:07:08,463 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 17:07:08,468 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 17:07:08,470 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:07:08" (1/1) ... [2021-11-23 17:07:08,473 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@251e0859 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:07:08, skipping insertion in model container [2021-11-23 17:07:08,474 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:07:08" (1/1) ... [2021-11-23 17:07:08,485 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 17:07:08,718 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 17:07:09,256 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/sv-benchmarks/c/combinations/pals_lcr.4.ufo.BOUNDED-8.pals+Problem12_label02.c[8616,8629] [2021-11-23 17:07:09,347 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/sv-benchmarks/c/combinations/pals_lcr.4.ufo.BOUNDED-8.pals+Problem12_label02.c[15906,15919] [2021-11-23 17:07:10,804 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:07:10,823 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 17:07:10,892 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/sv-benchmarks/c/combinations/pals_lcr.4.ufo.BOUNDED-8.pals+Problem12_label02.c[8616,8629] [2021-11-23 17:07:10,917 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/sv-benchmarks/c/combinations/pals_lcr.4.ufo.BOUNDED-8.pals+Problem12_label02.c[15906,15919] [2021-11-23 17:07:11,794 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:07:11,883 INFO L208 MainTranslator]: Completed translation [2021-11-23 17:07:11,884 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:07:11 WrapperNode [2021-11-23 17:07:11,885 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 17:07:11,887 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 17:07:11,887 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 17:07:11,887 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 17:07:11,898 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:07:11" (1/1) ... [2021-11-23 17:07:12,028 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:07:11" (1/1) ... [2021-11-23 17:07:12,693 INFO L137 Inliner]: procedures = 34, calls = 20, calls flagged for inlining = 15, calls inlined = 15, statements flattened = 5031 [2021-11-23 17:07:12,694 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 17:07:12,696 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 17:07:12,696 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 17:07:12,696 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 17:07:12,710 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:07:11" (1/1) ... [2021-11-23 17:07:12,710 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:07:11" (1/1) ... [2021-11-23 17:07:12,826 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:07:11" (1/1) ... [2021-11-23 17:07:12,827 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:07:11" (1/1) ... [2021-11-23 17:07:13,122 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:07:11" (1/1) ... [2021-11-23 17:07:13,214 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:07:11" (1/1) ... [2021-11-23 17:07:13,247 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:07:11" (1/1) ... [2021-11-23 17:07:13,365 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 17:07:13,367 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 17:07:13,367 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 17:07:13,367 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 17:07:13,368 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:07:11" (1/1) ... [2021-11-23 17:07:13,391 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:07:13,416 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:07:13,456 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 17:07:13,538 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 17:07:13,605 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 17:07:13,620 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 17:07:13,620 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 17:07:13,621 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 17:07:13,896 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 17:07:13,903 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 17:07:20,399 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 17:07:20,506 FATAL L? ?]: The Plugin de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder has thrown an exception: java.lang.UnsupportedOperationException: Set is immutable at de.uni_freiburg.informatik.ultimate.util.datastructures.ImmutableSet.addAll(ImmutableSet.java:313) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaBuilder.addBranchEncoders(TransFormulaBuilder.java:170) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaUtils.parallelComposition(TransFormulaUtils.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.ParallelComposition.(ParallelComposition.java:108) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CodeBlockFactory.constructParallelComposition(CodeBlockFactory.java:109) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CfgBuilder$LargeBlockEncoding.composeParallel(CfgBuilder.java:1792) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CfgBuilder$LargeBlockEncoding.(CfgBuilder.java:1653) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CfgBuilder.createIcfg(CfgBuilder.java:280) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.RCFGBuilderObserver.process(RCFGBuilderObserver.java:88) at de.uni_freiburg.informatik.ultimate.core.coreplugin.modelwalker.DFSTreeWalker.runObserver(DFSTreeWalker.java:65) at de.uni_freiburg.informatik.ultimate.core.coreplugin.modelwalker.BaseWalker.runObserver(BaseWalker.java:93) at de.uni_freiburg.informatik.ultimate.core.coreplugin.modelwalker.BaseWalker.run(BaseWalker.java:86) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 17:07:20,519 INFO L158 Benchmark]: Toolchain (without parser) took 12056.69ms. Allocated memory was 113.2MB in the beginning and 545.3MB in the end (delta: 432.0MB). Free memory was 67.5MB in the beginning and 305.0MB in the end (delta: -237.5MB). Peak memory consumption was 209.6MB. Max. memory is 16.1GB. [2021-11-23 17:07:20,522 INFO L158 Benchmark]: CDTParser took 0.39ms. Allocated memory is still 113.2MB. Free memory was 64.9MB in the beginning and 64.8MB in the end (delta: 91.0kB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-23 17:07:20,525 INFO L158 Benchmark]: CACSL2BoogieTranslator took 3423.31ms. Allocated memory was 113.2MB in the beginning and 188.7MB in the end (delta: 75.5MB). Free memory was 67.3MB in the beginning and 133.3MB in the end (delta: -66.0MB). Peak memory consumption was 69.2MB. Max. memory is 16.1GB. [2021-11-23 17:07:20,528 INFO L158 Benchmark]: Boogie Procedure Inliner took 807.70ms. Allocated memory is still 188.7MB. Free memory was 133.3MB in the beginning and 93.5MB in the end (delta: 39.8MB). Peak memory consumption was 100.5MB. Max. memory is 16.1GB. [2021-11-23 17:07:20,530 INFO L158 Benchmark]: Boogie Preprocessor took 669.56ms. Allocated memory is still 188.7MB. Free memory was 93.5MB in the beginning and 69.1MB in the end (delta: 24.4MB). Peak memory consumption was 46.1MB. Max. memory is 16.1GB. [2021-11-23 17:07:20,532 INFO L158 Benchmark]: RCFGBuilder took 7144.98ms. Allocated memory was 188.7MB in the beginning and 545.3MB in the end (delta: 356.5MB). Free memory was 69.1MB in the beginning and 305.0MB in the end (delta: -235.9MB). Peak memory consumption was 136.3MB. Max. memory is 16.1GB. [2021-11-23 17:07:20,549 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.39ms. Allocated memory is still 113.2MB. Free memory was 64.9MB in the beginning and 64.8MB in the end (delta: 91.0kB). There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 3423.31ms. Allocated memory was 113.2MB in the beginning and 188.7MB in the end (delta: 75.5MB). Free memory was 67.3MB in the beginning and 133.3MB in the end (delta: -66.0MB). Peak memory consumption was 69.2MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 807.70ms. Allocated memory is still 188.7MB. Free memory was 133.3MB in the beginning and 93.5MB in the end (delta: 39.8MB). Peak memory consumption was 100.5MB. Max. memory is 16.1GB. * Boogie Preprocessor took 669.56ms. Allocated memory is still 188.7MB. Free memory was 93.5MB in the beginning and 69.1MB in the end (delta: 24.4MB). Peak memory consumption was 46.1MB. Max. memory is 16.1GB. * RCFGBuilder took 7144.98ms. Allocated memory was 188.7MB in the beginning and 545.3MB in the end (delta: 356.5MB). Free memory was 69.1MB in the beginning and 305.0MB in the end (delta: -235.9MB). Peak memory consumption was 136.3MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: - ExceptionOrErrorResult: UnsupportedOperationException: Set is immutable de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: UnsupportedOperationException: Set is immutable: de.uni_freiburg.informatik.ultimate.util.datastructures.ImmutableSet.addAll(ImmutableSet.java:313) RESULT: Ultimate could not prove your program: Toolchain returned no result. [2021-11-23 17:07:20,580 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request... --- End real Ultimate output --- Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis ### Bit-precise run ### Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/pals_lcr.4.ufo.BOUNDED-8.pals+Problem12_label02.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 71ab165d8600c7bf3c601364205c3c131ed910663de3282b3121f676cf35500e --- Real Ultimate output --- This is Ultimate 0.2.2-dev-6a47aea [2021-11-23 17:07:24,189 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 17:07:24,192 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 17:07:24,254 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 17:07:24,255 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 17:07:24,266 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 17:07:24,270 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 17:07:24,277 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 17:07:24,282 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 17:07:24,284 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 17:07:24,286 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 17:07:24,288 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 17:07:24,289 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 17:07:24,291 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 17:07:24,293 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 17:07:24,295 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 17:07:24,297 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 17:07:24,300 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 17:07:24,303 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 17:07:24,312 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 17:07:24,314 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 17:07:24,321 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 17:07:24,323 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 17:07:24,325 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 17:07:24,339 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 17:07:24,340 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 17:07:24,340 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 17:07:24,347 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 17:07:24,348 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 17:07:24,349 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 17:07:24,350 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 17:07:24,351 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 17:07:24,353 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 17:07:24,357 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 17:07:24,360 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 17:07:24,360 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 17:07:24,362 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 17:07:24,362 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 17:07:24,363 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 17:07:24,366 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 17:07:24,367 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 17:07:24,368 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2021-11-23 17:07:24,426 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 17:07:24,427 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 17:07:24,428 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 17:07:24,428 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 17:07:24,429 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 17:07:24,429 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 17:07:24,430 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 17:07:24,430 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 17:07:24,430 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 17:07:24,431 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 17:07:24,431 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 17:07:24,431 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 17:07:24,432 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 17:07:24,433 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 17:07:24,433 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 17:07:24,433 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 17:07:24,437 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 17:07:24,437 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 17:07:24,438 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 17:07:24,438 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-23 17:07:24,438 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-23 17:07:24,439 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-23 17:07:24,439 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 17:07:24,440 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 17:07:24,440 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 17:07:24,440 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 17:07:24,441 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 17:07:24,441 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-23 17:07:24,442 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 17:07:24,442 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:07:24,443 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 17:07:24,443 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 17:07:24,443 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 17:07:24,444 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-23 17:07:24,444 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-23 17:07:24,444 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 17:07:24,446 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 17:07:24,446 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 17:07:24,447 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_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 71ab165d8600c7bf3c601364205c3c131ed910663de3282b3121f676cf35500e [2021-11-23 17:07:24,976 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 17:07:25,015 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 17:07:25,022 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 17:07:25,024 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 17:07:25,025 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 17:07:25,027 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/../../sv-benchmarks/c/combinations/pals_lcr.4.ufo.BOUNDED-8.pals+Problem12_label02.c [2021-11-23 17:07:25,157 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/data/3f14a99c6/66ee0a921fad433daafec27b185bd093/FLAGbe79d6747 [2021-11-23 17:07:26,691 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 17:07:26,693 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/sv-benchmarks/c/combinations/pals_lcr.4.ufo.BOUNDED-8.pals+Problem12_label02.c [2021-11-23 17:07:26,759 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/data/3f14a99c6/66ee0a921fad433daafec27b185bd093/FLAGbe79d6747 [2021-11-23 17:07:26,844 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/data/3f14a99c6/66ee0a921fad433daafec27b185bd093 [2021-11-23 17:07:26,851 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 17:07:26,854 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 17:07:26,857 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 17:07:26,858 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 17:07:26,864 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 17:07:26,866 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:07:26" (1/1) ... [2021-11-23 17:07:26,869 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@331e4b20 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:07:26, skipping insertion in model container [2021-11-23 17:07:26,870 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:07:26" (1/1) ... [2021-11-23 17:07:26,881 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 17:07:27,110 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 17:07:27,730 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/sv-benchmarks/c/combinations/pals_lcr.4.ufo.BOUNDED-8.pals+Problem12_label02.c[8616,8629] [2021-11-23 17:07:27,814 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/sv-benchmarks/c/combinations/pals_lcr.4.ufo.BOUNDED-8.pals+Problem12_label02.c[15906,15919] [2021-11-23 17:07:29,392 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:07:29,412 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 17:07:29,490 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/sv-benchmarks/c/combinations/pals_lcr.4.ufo.BOUNDED-8.pals+Problem12_label02.c[8616,8629] [2021-11-23 17:07:29,535 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/sv-benchmarks/c/combinations/pals_lcr.4.ufo.BOUNDED-8.pals+Problem12_label02.c[15906,15919] [2021-11-23 17:07:30,553 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:07:30,610 INFO L208 MainTranslator]: Completed translation [2021-11-23 17:07:30,611 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:07:30 WrapperNode [2021-11-23 17:07:30,611 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 17:07:30,614 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 17:07:30,615 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 17:07:30,615 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 17:07:30,629 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:07:30" (1/1) ... [2021-11-23 17:07:30,772 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:07:30" (1/1) ... [2021-11-23 17:07:31,087 INFO L137 Inliner]: procedures = 35, calls = 20, calls flagged for inlining = 15, calls inlined = 15, statements flattened = 5009 [2021-11-23 17:07:31,088 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 17:07:31,090 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 17:07:31,090 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 17:07:31,091 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 17:07:31,105 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:07:30" (1/1) ... [2021-11-23 17:07:31,106 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:07:30" (1/1) ... [2021-11-23 17:07:31,242 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:07:30" (1/1) ... [2021-11-23 17:07:31,242 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:07:30" (1/1) ... [2021-11-23 17:07:31,480 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:07:30" (1/1) ... [2021-11-23 17:07:31,538 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:07:30" (1/1) ... [2021-11-23 17:07:31,598 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:07:30" (1/1) ... [2021-11-23 17:07:31,672 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 17:07:31,674 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 17:07:31,675 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 17:07:31,675 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 17:07:31,676 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:07:30" (1/1) ... [2021-11-23 17:07:31,687 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:07:31,703 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:07:31,722 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 17:07:31,744 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 17:07:31,803 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 17:07:31,803 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-23 17:07:31,804 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 17:07:31,804 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 17:07:31,964 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 17:07:31,966 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 17:08:15,327 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 17:08:15,358 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 17:08:15,358 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-23 17:08:15,364 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 05:08:15 BoogieIcfgContainer [2021-11-23 17:08:15,364 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 17:08:15,368 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 17:08:15,368 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 17:08:15,373 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 17:08:15,373 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 05:07:26" (1/3) ... [2021-11-23 17:08:15,375 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3addc72e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 05:08:15, skipping insertion in model container [2021-11-23 17:08:15,375 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:07:30" (2/3) ... [2021-11-23 17:08:15,376 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3addc72e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 05:08:15, skipping insertion in model container [2021-11-23 17:08:15,376 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 05:08:15" (3/3) ... [2021-11-23 17:08:15,378 INFO L111 eAbstractionObserver]: Analyzing ICFG pals_lcr.4.ufo.BOUNDED-8.pals+Problem12_label02.c [2021-11-23 17:08:15,387 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 17:08:15,387 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-23 17:08:15,469 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 17:08:15,479 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-23 17:08:15,480 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-23 17:08:15,540 INFO L276 IsEmpty]: Start isEmpty. Operand has 893 states, 890 states have (on average 1.902247191011236) internal successors, (1693), 892 states have internal predecessors, (1693), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:08:15,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-23 17:08:15,552 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:08:15,553 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:08:15,554 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:08:15,561 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:08:15,562 INFO L85 PathProgramCache]: Analyzing trace with hash 1675876582, now seen corresponding path program 1 times [2021-11-23 17:08:15,585 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:08:15,586 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2065624792] [2021-11-23 17:08:15,586 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:08:15,587 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:08:15,588 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:08:15,606 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:08:15,618 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-23 17:08:15,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:08:15,802 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 1 conjunts are in the unsatisfiable core [2021-11-23 17:08:15,815 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:08:16,013 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:08:16,013 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:08:16,015 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:08:16,015 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2065624792] [2021-11-23 17:08:16,016 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2065624792] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:08:16,017 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:08:16,017 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 17:08:16,020 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1748177118] [2021-11-23 17:08:16,021 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:08:16,039 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-23 17:08:16,039 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:08:16,117 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-23 17:08:16,118 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-23 17:08:16,125 INFO L87 Difference]: Start difference. First operand has 893 states, 890 states have (on average 1.902247191011236) internal successors, (1693), 892 states have internal predecessors, (1693), 0 states have call successors, (0), 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 15.0) internal successors, (30), 2 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:08:16,392 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:08:16,392 INFO L93 Difference]: Finished difference Result 1757 states and 3332 transitions. [2021-11-23 17:08:16,395 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-23 17:08:16,396 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 15.0) internal successors, (30), 2 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 30 [2021-11-23 17:08:16,397 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:08:16,429 INFO L225 Difference]: With dead ends: 1757 [2021-11-23 17:08:16,429 INFO L226 Difference]: Without dead ends: 827 [2021-11-23 17:08:16,440 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-23 17:08:16,446 INFO L933 BasicCegarLoop]: 1627 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, 1627 SdHoareTripleChecker+Invalid, 0 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 [2021-11-23 17:08:16,447 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 1627 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:08:16,475 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 827 states. [2021-11-23 17:08:16,596 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 827 to 827. [2021-11-23 17:08:16,606 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 827 states, 825 states have (on average 1.8909090909090909) internal successors, (1560), 826 states have internal predecessors, (1560), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:08:16,611 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 827 states to 827 states and 1560 transitions. [2021-11-23 17:08:16,613 INFO L78 Accepts]: Start accepts. Automaton has 827 states and 1560 transitions. Word has length 30 [2021-11-23 17:08:16,614 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:08:16,614 INFO L470 AbstractCegarLoop]: Abstraction has 827 states and 1560 transitions. [2021-11-23 17:08:16,614 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 15.0) internal successors, (30), 2 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:08:16,615 INFO L276 IsEmpty]: Start isEmpty. Operand 827 states and 1560 transitions. [2021-11-23 17:08:16,617 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-23 17:08:16,617 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:08:16,617 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:08:16,638 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-23 17:08:16,827 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:08:16,828 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:08:16,829 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:08:16,829 INFO L85 PathProgramCache]: Analyzing trace with hash 1541863076, now seen corresponding path program 1 times [2021-11-23 17:08:16,830 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:08:16,831 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [354588669] [2021-11-23 17:08:16,831 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:08:16,831 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:08:16,832 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:08:16,838 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:08:16,845 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-23 17:08:16,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:08:16,943 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:08:16,945 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:08:17,161 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:08:17,161 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:08:17,162 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:08:17,162 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [354588669] [2021-11-23 17:08:17,162 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [354588669] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:08:17,163 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:08:17,163 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:08:17,163 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [36768057] [2021-11-23 17:08:17,164 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:08:17,165 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:08:17,166 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:08:17,166 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:08:17,167 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:08:17,167 INFO L87 Difference]: Start difference. First operand 827 states and 1560 transitions. Second operand has 5 states, 5 states have (on average 6.0) internal successors, (30), 5 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:08:17,362 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:08:17,362 INFO L93 Difference]: Finished difference Result 919 states and 1702 transitions. [2021-11-23 17:08:17,363 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 17:08:17,364 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 6.0) internal successors, (30), 5 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 30 [2021-11-23 17:08:17,364 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:08:17,373 INFO L225 Difference]: With dead ends: 919 [2021-11-23 17:08:17,373 INFO L226 Difference]: Without dead ends: 871 [2021-11-23 17:08:17,375 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:08:17,378 INFO L933 BasicCegarLoop]: 1556 mSDtfsCounter, 71 mSDsluCounter, 4640 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 71 SdHoareTripleChecker+Valid, 6196 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:08:17,379 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [71 Valid, 6196 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:08:17,385 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 871 states. [2021-11-23 17:08:17,420 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 871 to 827. [2021-11-23 17:08:17,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 827 states, 825 states have (on average 1.863030303030303) internal successors, (1537), 826 states have internal predecessors, (1537), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:08:17,439 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 827 states to 827 states and 1537 transitions. [2021-11-23 17:08:17,439 INFO L78 Accepts]: Start accepts. Automaton has 827 states and 1537 transitions. Word has length 30 [2021-11-23 17:08:17,440 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:08:17,440 INFO L470 AbstractCegarLoop]: Abstraction has 827 states and 1537 transitions. [2021-11-23 17:08:17,441 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 6.0) internal successors, (30), 5 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:08:17,441 INFO L276 IsEmpty]: Start isEmpty. Operand 827 states and 1537 transitions. [2021-11-23 17:08:17,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-23 17:08:17,455 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:08:17,455 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:08:17,478 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-11-23 17:08:17,674 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:08:17,675 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:08:17,676 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:08:17,676 INFO L85 PathProgramCache]: Analyzing trace with hash 159296799, now seen corresponding path program 1 times [2021-11-23 17:08:17,676 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:08:17,677 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1155691460] [2021-11-23 17:08:17,677 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:08:17,677 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:08:17,677 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:08:17,679 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:08:17,693 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-23 17:08:17,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:08:17,828 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:08:17,831 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:08:18,230 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:08:18,230 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:08:18,231 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:08:18,231 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1155691460] [2021-11-23 17:08:18,231 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1155691460] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:08:18,232 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:08:18,232 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:08:18,232 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2119192981] [2021-11-23 17:08:18,232 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:08:18,233 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:08:18,234 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:08:18,234 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:08:18,235 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:08:18,235 INFO L87 Difference]: Start difference. First operand 827 states and 1537 transitions. Second operand has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:08:18,300 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:08:18,300 INFO L93 Difference]: Finished difference Result 909 states and 1665 transitions. [2021-11-23 17:08:18,301 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:08:18,302 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 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 [2021-11-23 17:08:18,302 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:08:18,311 INFO L225 Difference]: With dead ends: 909 [2021-11-23 17:08:18,311 INFO L226 Difference]: Without dead ends: 865 [2021-11-23 17:08:18,313 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:08:18,315 INFO L933 BasicCegarLoop]: 1592 mSDtfsCounter, 1498 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1498 SdHoareTripleChecker+Valid, 1659 SdHoareTripleChecker+Invalid, 7 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 4 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:08:18,316 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1498 Valid, 1659 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:08:18,320 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 865 states. [2021-11-23 17:08:18,349 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 865 to 863. [2021-11-23 17:08:18,353 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 863 states, 861 states have (on average 1.8513356562137049) internal successors, (1594), 862 states have internal predecessors, (1594), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:08:18,359 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 863 states to 863 states and 1594 transitions. [2021-11-23 17:08:18,360 INFO L78 Accepts]: Start accepts. Automaton has 863 states and 1594 transitions. Word has length 52 [2021-11-23 17:08:18,360 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:08:18,361 INFO L470 AbstractCegarLoop]: Abstraction has 863 states and 1594 transitions. [2021-11-23 17:08:18,362 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:08:18,362 INFO L276 IsEmpty]: Start isEmpty. Operand 863 states and 1594 transitions. [2021-11-23 17:08:18,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-23 17:08:18,366 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:08:18,367 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:08:18,395 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-23 17:08:18,587 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:08:18,588 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:08:18,588 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:08:18,589 INFO L85 PathProgramCache]: Analyzing trace with hash -1780734059, now seen corresponding path program 1 times [2021-11-23 17:08:18,589 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:08:18,590 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [801601847] [2021-11-23 17:08:18,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:08:18,590 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:08:18,590 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:08:18,593 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:08:18,634 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-11-23 17:08:18,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:08:18,715 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:08:18,717 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:08:18,997 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:08:18,997 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:08:18,998 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:08:18,998 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [801601847] [2021-11-23 17:08:18,998 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [801601847] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:08:18,998 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:08:18,998 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:08:18,999 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1057825744] [2021-11-23 17:08:18,999 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:08:18,999 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:08:19,000 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:08:19,000 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:08:19,001 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:08:19,001 INFO L87 Difference]: Start difference. First operand 863 states and 1594 transitions. Second operand has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:08:19,080 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:08:19,080 INFO L93 Difference]: Finished difference Result 1011 states and 1826 transitions. [2021-11-23 17:08:19,081 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:08:19,082 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 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 [2021-11-23 17:08:19,083 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:08:19,092 INFO L225 Difference]: With dead ends: 1011 [2021-11-23 17:08:19,094 INFO L226 Difference]: Without dead ends: 931 [2021-11-23 17:08:19,098 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:08:19,100 INFO L933 BasicCegarLoop]: 1587 mSDtfsCounter, 1494 mSDsluCounter, 71 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1494 SdHoareTripleChecker+Valid, 1658 SdHoareTripleChecker+Invalid, 7 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 4 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:08:19,101 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1494 Valid, 1658 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:08:19,105 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 931 states. [2021-11-23 17:08:19,135 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 931 to 929. [2021-11-23 17:08:19,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 929 states, 927 states have (on average 1.8306364617044228) internal successors, (1697), 928 states have internal predecessors, (1697), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:08:19,145 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 929 states to 929 states and 1697 transitions. [2021-11-23 17:08:19,145 INFO L78 Accepts]: Start accepts. Automaton has 929 states and 1697 transitions. Word has length 52 [2021-11-23 17:08:19,146 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:08:19,146 INFO L470 AbstractCegarLoop]: Abstraction has 929 states and 1697 transitions. [2021-11-23 17:08:19,147 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:08:19,147 INFO L276 IsEmpty]: Start isEmpty. Operand 929 states and 1697 transitions. [2021-11-23 17:08:19,148 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-23 17:08:19,148 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:08:19,148 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:08:19,169 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-11-23 17:08:19,364 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:08:19,365 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:08:19,365 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:08:19,366 INFO L85 PathProgramCache]: Analyzing trace with hash 919948555, now seen corresponding path program 1 times [2021-11-23 17:08:19,366 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:08:19,366 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1068103300] [2021-11-23 17:08:19,366 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:08:19,366 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:08:19,367 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:08:19,373 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:08:19,374 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-11-23 17:08:19,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:08:19,476 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:08:19,479 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:08:19,723 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:08:19,723 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:08:19,723 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:08:19,724 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1068103300] [2021-11-23 17:08:19,724 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1068103300] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:08:19,724 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:08:19,724 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:08:19,724 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [391404848] [2021-11-23 17:08:19,725 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:08:19,725 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:08:19,725 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:08:19,726 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:08:19,726 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:08:19,726 INFO L87 Difference]: Start difference. First operand 929 states and 1697 transitions. Second operand has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:08:19,801 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:08:19,802 INFO L93 Difference]: Finished difference Result 1197 states and 2115 transitions. [2021-11-23 17:08:19,802 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:08:19,803 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 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 [2021-11-23 17:08:19,805 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:08:19,814 INFO L225 Difference]: With dead ends: 1197 [2021-11-23 17:08:19,815 INFO L226 Difference]: Without dead ends: 1051 [2021-11-23 17:08:19,816 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:08:19,817 INFO L933 BasicCegarLoop]: 1582 mSDtfsCounter, 1490 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1490 SdHoareTripleChecker+Valid, 1657 SdHoareTripleChecker+Invalid, 7 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 4 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:08:19,818 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1490 Valid, 1657 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:08:19,823 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1051 states. [2021-11-23 17:08:19,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1051 to 1049. [2021-11-23 17:08:19,863 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1049 states, 1047 states have (on average 1.7965616045845272) internal successors, (1881), 1048 states have internal predecessors, (1881), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:08:19,874 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1049 states to 1049 states and 1881 transitions. [2021-11-23 17:08:19,874 INFO L78 Accepts]: Start accepts. Automaton has 1049 states and 1881 transitions. Word has length 52 [2021-11-23 17:08:19,875 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:08:19,875 INFO L470 AbstractCegarLoop]: Abstraction has 1049 states and 1881 transitions. [2021-11-23 17:08:19,876 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:08:19,876 INFO L276 IsEmpty]: Start isEmpty. Operand 1049 states and 1881 transitions. [2021-11-23 17:08:19,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-23 17:08:19,878 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:08:19,879 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:08:19,895 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (6)] Ended with exit code 0 [2021-11-23 17:08:20,095 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:08:20,097 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:08:20,098 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:08:20,098 INFO L85 PathProgramCache]: Analyzing trace with hash 1515907135, now seen corresponding path program 1 times [2021-11-23 17:08:20,099 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:08:20,099 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1319782685] [2021-11-23 17:08:20,099 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:08:20,100 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:08:20,100 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:08:20,101 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:08:20,104 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-11-23 17:08:20,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:08:20,206 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:08:20,209 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:08:21,481 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:08:21,481 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:08:21,484 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:08:21,484 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1319782685] [2021-11-23 17:08:21,485 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1319782685] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:08:21,485 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:08:21,485 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:08:21,486 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [935358085] [2021-11-23 17:08:21,486 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:08:21,488 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:08:21,489 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:08:21,490 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:08:21,490 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:08:21,491 INFO L87 Difference]: Start difference. First operand 1049 states and 1881 transitions. Second operand has 6 states, 6 states have (on average 8.666666666666666) internal successors, (52), 5 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:08:21,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:08:21,756 INFO L93 Difference]: Finished difference Result 1326 states and 2308 transitions. [2021-11-23 17:08:21,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:08:21,757 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 8.666666666666666) internal successors, (52), 5 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 [2021-11-23 17:08:21,758 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:08:21,772 INFO L225 Difference]: With dead ends: 1326 [2021-11-23 17:08:21,772 INFO L226 Difference]: Without dead ends: 1060 [2021-11-23 17:08:21,774 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:08:21,775 INFO L933 BasicCegarLoop]: 1526 mSDtfsCounter, 1458 mSDsluCounter, 1604 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1458 SdHoareTripleChecker+Valid, 3130 SdHoareTripleChecker+Invalid, 74 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 33 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:08:21,776 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1458 Valid, 3130 Invalid, 74 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 40 Invalid, 0 Unknown, 33 Unchecked, 0.1s Time] [2021-11-23 17:08:21,781 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1060 states. [2021-11-23 17:08:21,819 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1060 to 1060. [2021-11-23 17:08:21,822 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1060 states, 1058 states have (on average 1.7901701323251418) internal successors, (1894), 1059 states have internal predecessors, (1894), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:08:21,830 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1060 states to 1060 states and 1894 transitions. [2021-11-23 17:08:21,830 INFO L78 Accepts]: Start accepts. Automaton has 1060 states and 1894 transitions. Word has length 52 [2021-11-23 17:08:21,831 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:08:21,831 INFO L470 AbstractCegarLoop]: Abstraction has 1060 states and 1894 transitions. [2021-11-23 17:08:21,832 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 8.666666666666666) internal successors, (52), 5 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:08:21,832 INFO L276 IsEmpty]: Start isEmpty. Operand 1060 states and 1894 transitions. [2021-11-23 17:08:21,833 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-23 17:08:21,833 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:08:21,833 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:08:21,880 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2021-11-23 17:08:22,046 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:08:22,047 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:08:22,048 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:08:22,048 INFO L85 PathProgramCache]: Analyzing trace with hash 1257741697, now seen corresponding path program 1 times [2021-11-23 17:08:22,048 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:08:22,049 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [780373051] [2021-11-23 17:08:22,049 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:08:22,049 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:08:22,049 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:08:22,051 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:08:22,085 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-11-23 17:08:22,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:08:22,187 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:08:22,189 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:08:22,426 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:08:22,426 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:08:22,426 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:08:22,426 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [780373051] [2021-11-23 17:08:22,426 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [780373051] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:08:22,427 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:08:22,427 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:08:22,427 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1236619457] [2021-11-23 17:08:22,427 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:08:22,428 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:08:22,428 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:08:22,428 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:08:22,428 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:08:22,429 INFO L87 Difference]: Start difference. First operand 1060 states and 1894 transitions. Second operand has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:08:22,502 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:08:22,502 INFO L93 Difference]: Finished difference Result 1544 states and 2640 transitions. [2021-11-23 17:08:22,503 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:08:22,503 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 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 [2021-11-23 17:08:22,504 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:08:22,516 INFO L225 Difference]: With dead ends: 1544 [2021-11-23 17:08:22,517 INFO L226 Difference]: Without dead ends: 1278 [2021-11-23 17:08:22,520 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:08:22,522 INFO L933 BasicCegarLoop]: 1577 mSDtfsCounter, 1486 mSDsluCounter, 79 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1486 SdHoareTripleChecker+Valid, 1656 SdHoareTripleChecker+Invalid, 7 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 4 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:08:22,522 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1486 Valid, 1656 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:08:22,527 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1278 states. [2021-11-23 17:08:22,582 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1278 to 1276. [2021-11-23 17:08:22,587 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1276 states, 1274 states have (on average 1.7409733124018838) internal successors, (2218), 1275 states have internal predecessors, (2218), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:08:22,595 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1276 states to 1276 states and 2218 transitions. [2021-11-23 17:08:22,596 INFO L78 Accepts]: Start accepts. Automaton has 1276 states and 2218 transitions. Word has length 52 [2021-11-23 17:08:22,596 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:08:22,597 INFO L470 AbstractCegarLoop]: Abstraction has 1276 states and 2218 transitions. [2021-11-23 17:08:22,597 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:08:22,597 INFO L276 IsEmpty]: Start isEmpty. Operand 1276 states and 2218 transitions. [2021-11-23 17:08:22,598 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-23 17:08:22,598 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:08:22,599 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:08:22,625 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-11-23 17:08:22,813 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:08:22,814 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:08:22,814 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:08:22,815 INFO L85 PathProgramCache]: Analyzing trace with hash 1666380469, now seen corresponding path program 1 times [2021-11-23 17:08:22,815 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:08:22,815 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [864069241] [2021-11-23 17:08:22,816 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:08:22,816 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:08:22,816 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:08:22,818 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:08:22,826 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-11-23 17:08:22,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:08:22,956 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:08:22,958 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:08:23,898 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:08:23,898 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:08:23,899 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:08:23,899 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [864069241] [2021-11-23 17:08:23,899 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [864069241] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:08:23,899 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:08:23,899 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:08:23,899 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [379929421] [2021-11-23 17:08:23,900 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:08:23,900 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:08:23,900 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:08:23,901 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:08:23,901 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:08:23,901 INFO L87 Difference]: Start difference. First operand 1276 states and 2218 transitions. Second operand has 6 states, 6 states have (on average 8.666666666666666) internal successors, (52), 5 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:08:24,072 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:08:24,073 INFO L93 Difference]: Finished difference Result 1762 states and 2960 transitions. [2021-11-23 17:08:24,074 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:08:24,074 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 8.666666666666666) internal successors, (52), 5 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 [2021-11-23 17:08:24,076 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:08:24,088 INFO L225 Difference]: With dead ends: 1762 [2021-11-23 17:08:24,089 INFO L226 Difference]: Without dead ends: 1280 [2021-11-23 17:08:24,091 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:08:24,092 INFO L933 BasicCegarLoop]: 1524 mSDtfsCounter, 2907 mSDsluCounter, 1531 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2907 SdHoareTripleChecker+Valid, 3055 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 17 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:08:24,093 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2907 Valid, 3055 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 17 Invalid, 0 Unknown, 17 Unchecked, 0.0s Time] [2021-11-23 17:08:24,097 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1280 states. [2021-11-23 17:08:24,144 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1280 to 1280. [2021-11-23 17:08:24,149 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1280 states, 1278 states have (on average 1.7386541471048513) internal successors, (2222), 1279 states have internal predecessors, (2222), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:08:24,158 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1280 states to 1280 states and 2222 transitions. [2021-11-23 17:08:24,158 INFO L78 Accepts]: Start accepts. Automaton has 1280 states and 2222 transitions. Word has length 52 [2021-11-23 17:08:24,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:08:24,159 INFO L470 AbstractCegarLoop]: Abstraction has 1280 states and 2222 transitions. [2021-11-23 17:08:24,159 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 8.666666666666666) internal successors, (52), 5 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:08:24,159 INFO L276 IsEmpty]: Start isEmpty. Operand 1280 states and 2222 transitions. [2021-11-23 17:08:24,160 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-23 17:08:24,160 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:08:24,161 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:08:24,193 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2021-11-23 17:08:24,380 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:08:24,380 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:08:24,381 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:08:24,381 INFO L85 PathProgramCache]: Analyzing trace with hash -1819240201, now seen corresponding path program 1 times [2021-11-23 17:08:24,382 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:08:24,382 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1037627768] [2021-11-23 17:08:24,382 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:08:24,383 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:08:24,383 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:08:24,384 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:08:24,386 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-11-23 17:08:24,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:08:24,504 INFO L263 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:08:24,507 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:08:25,826 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:08:25,826 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:08:25,827 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:08:25,827 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1037627768] [2021-11-23 17:08:25,827 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1037627768] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:08:25,828 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:08:25,828 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 17:08:25,828 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1462430687] [2021-11-23 17:08:25,829 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:08:25,829 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:08:25,830 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:08:25,831 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:08:25,831 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:08:25,831 INFO L87 Difference]: Start difference. First operand 1280 states and 2222 transitions. Second operand has 6 states, 6 states have (on average 8.666666666666666) internal successors, (52), 6 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:08:26,306 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:08:26,306 INFO L93 Difference]: Finished difference Result 3690 states and 5907 transitions. [2021-11-23 17:08:26,307 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 17:08:26,308 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 8.666666666666666) internal successors, (52), 6 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 [2021-11-23 17:08:26,308 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:08:26,336 INFO L225 Difference]: With dead ends: 3690 [2021-11-23 17:08:26,337 INFO L226 Difference]: Without dead ends: 3208 [2021-11-23 17:08:26,339 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:08:26,340 INFO L933 BasicCegarLoop]: 1531 mSDtfsCounter, 3213 mSDsluCounter, 296 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3213 SdHoareTripleChecker+Valid, 1827 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 17:08:26,341 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3213 Valid, 1827 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 17:08:26,347 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3208 states. [2021-11-23 17:08:26,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3208 to 2240. [2021-11-23 17:08:26,478 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2240 states, 2238 states have (on average 1.6291331546023236) internal successors, (3646), 2239 states have internal predecessors, (3646), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:08:26,491 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2240 states to 2240 states and 3646 transitions. [2021-11-23 17:08:26,491 INFO L78 Accepts]: Start accepts. Automaton has 2240 states and 3646 transitions. Word has length 52 [2021-11-23 17:08:26,492 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:08:26,492 INFO L470 AbstractCegarLoop]: Abstraction has 2240 states and 3646 transitions. [2021-11-23 17:08:26,492 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 8.666666666666666) internal successors, (52), 6 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:08:26,493 INFO L276 IsEmpty]: Start isEmpty. Operand 2240 states and 3646 transitions. [2021-11-23 17:08:26,493 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-23 17:08:26,494 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:08:26,494 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:08:26,516 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2021-11-23 17:08:26,710 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:08:26,710 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:08:26,711 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:08:26,711 INFO L85 PathProgramCache]: Analyzing trace with hash -1653841945, now seen corresponding path program 1 times [2021-11-23 17:08:26,711 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:08:26,712 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [108772957] [2021-11-23 17:08:26,712 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:08:26,712 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:08:26,712 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:08:26,714 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:08:26,755 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2021-11-23 17:08:26,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:08:26,824 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:08:26,827 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:08:27,120 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:08:27,120 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:08:27,121 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:08:27,121 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [108772957] [2021-11-23 17:08:27,121 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [108772957] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:08:27,121 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:08:27,121 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:08:27,122 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1157953510] [2021-11-23 17:08:27,122 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:08:27,122 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:08:27,123 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:08:27,123 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:08:27,123 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:08:27,124 INFO L87 Difference]: Start difference. First operand 2240 states and 3646 transitions. Second operand has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 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) [2021-11-23 17:08:27,312 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:08:27,313 INFO L93 Difference]: Finished difference Result 4348 states and 6796 transitions. [2021-11-23 17:08:27,313 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:08:27,314 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 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) Word has length 54 [2021-11-23 17:08:27,314 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:08:27,340 INFO L225 Difference]: With dead ends: 4348 [2021-11-23 17:08:27,341 INFO L226 Difference]: Without dead ends: 2906 [2021-11-23 17:08:27,349 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:08:27,350 INFO L933 BasicCegarLoop]: 1560 mSDtfsCounter, 1478 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1478 SdHoareTripleChecker+Valid, 1624 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:08:27,352 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1478 Valid, 1624 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:08:27,361 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2906 states. [2021-11-23 17:08:27,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2906 to 2904. [2021-11-23 17:08:27,528 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2904 states, 2902 states have (on average 1.5830461750516884) internal successors, (4594), 2903 states have internal predecessors, (4594), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:08:27,546 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2904 states to 2904 states and 4594 transitions. [2021-11-23 17:08:27,546 INFO L78 Accepts]: Start accepts. Automaton has 2904 states and 4594 transitions. Word has length 54 [2021-11-23 17:08:27,546 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:08:27,547 INFO L470 AbstractCegarLoop]: Abstraction has 2904 states and 4594 transitions. [2021-11-23 17:08:27,547 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 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) [2021-11-23 17:08:27,547 INFO L276 IsEmpty]: Start isEmpty. Operand 2904 states and 4594 transitions. [2021-11-23 17:08:27,548 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-23 17:08:27,548 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:08:27,548 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:08:27,571 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (11)] Forceful destruction successful, exit code 0 [2021-11-23 17:08:27,762 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:08:27,762 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:08:27,762 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:08:27,763 INFO L85 PathProgramCache]: Analyzing trace with hash 1917083004, now seen corresponding path program 1 times [2021-11-23 17:08:27,763 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:08:27,763 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [573418660] [2021-11-23 17:08:27,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:08:27,764 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:08:27,764 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:08:27,766 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:08:27,810 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-11-23 17:08:27,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:08:27,899 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 17:08:27,901 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:08:28,074 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:08:28,074 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:08:28,075 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:08:28,075 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [573418660] [2021-11-23 17:08:28,075 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [573418660] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:08:28,075 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:08:28,076 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:08:28,076 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [310976357] [2021-11-23 17:08:28,076 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:08:28,076 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:08:28,077 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:08:28,077 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:08:28,077 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:08:28,078 INFO L87 Difference]: Start difference. First operand 2904 states and 4594 transitions. Second operand has 5 states, 5 states have (on average 11.0) internal successors, (55), 5 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:08:28,583 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:08:28,584 INFO L93 Difference]: Finished difference Result 4863 states and 7383 transitions. [2021-11-23 17:08:28,585 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:08:28,585 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 11.0) internal successors, (55), 5 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 55 [2021-11-23 17:08:28,586 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:08:28,626 INFO L225 Difference]: With dead ends: 4863 [2021-11-23 17:08:28,627 INFO L226 Difference]: Without dead ends: 4861 [2021-11-23 17:08:28,629 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-11-23 17:08:28,631 INFO L933 BasicCegarLoop]: 1559 mSDtfsCounter, 178 mSDsluCounter, 4604 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 178 SdHoareTripleChecker+Valid, 6163 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:08:28,631 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [178 Valid, 6163 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:08:28,642 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4861 states. [2021-11-23 17:08:28,863 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4861 to 3072. [2021-11-23 17:08:28,872 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3072 states, 3070 states have (on average 1.5485342019543975) internal successors, (4754), 3071 states have internal predecessors, (4754), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:08:28,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3072 states to 3072 states and 4754 transitions. [2021-11-23 17:08:28,885 INFO L78 Accepts]: Start accepts. Automaton has 3072 states and 4754 transitions. Word has length 55 [2021-11-23 17:08:28,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:08:28,886 INFO L470 AbstractCegarLoop]: Abstraction has 3072 states and 4754 transitions. [2021-11-23 17:08:28,886 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 11.0) internal successors, (55), 5 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:08:28,886 INFO L276 IsEmpty]: Start isEmpty. Operand 3072 states and 4754 transitions. [2021-11-23 17:08:28,887 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-11-23 17:08:28,887 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:08:28,888 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:08:28,910 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2021-11-23 17:08:29,102 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:08:29,102 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:08:29,103 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:08:29,103 INFO L85 PathProgramCache]: Analyzing trace with hash -748597284, now seen corresponding path program 1 times [2021-11-23 17:08:29,104 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:08:29,104 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [728050945] [2021-11-23 17:08:29,104 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:08:29,105 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:08:29,105 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:08:29,106 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:08:29,153 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2021-11-23 17:08:29,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:08:29,206 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:08:29,208 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:08:29,560 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:08:29,560 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:08:29,561 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:08:29,561 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [728050945] [2021-11-23 17:08:29,561 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [728050945] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:08:29,561 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:08:29,561 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 17:08:29,561 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1687469774] [2021-11-23 17:08:29,562 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:08:29,562 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:08:29,562 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:08:29,563 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:08:29,563 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:08:29,563 INFO L87 Difference]: Start difference. First operand 3072 states and 4754 transitions. Second operand has 3 states, 3 states have (on average 21.0) internal successors, (63), 2 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) [2021-11-23 17:09:23,784 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:09:23,785 INFO L93 Difference]: Finished difference Result 4576 states and 7627 transitions. [2021-11-23 17:09:23,785 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:09:23,786 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.0) internal successors, (63), 2 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 63 [2021-11-23 17:09:23,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:09:23,818 INFO L225 Difference]: With dead ends: 4576 [2021-11-23 17:09:23,818 INFO L226 Difference]: Without dead ends: 3823 [2021-11-23 17:09:23,821 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:09:23,822 INFO L933 BasicCegarLoop]: 519 mSDtfsCounter, 853 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 2274 mSolverCounterSat, 591 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 44.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 853 SdHoareTripleChecker+Valid, 526 SdHoareTripleChecker+Invalid, 2865 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 591 IncrementalHoareTripleChecker+Valid, 2274 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 53.8s IncrementalHoareTripleChecker+Time [2021-11-23 17:09:23,823 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [853 Valid, 526 Invalid, 2865 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [591 Valid, 2274 Invalid, 0 Unknown, 0 Unchecked, 53.8s Time] [2021-11-23 17:09:23,831 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3823 states. [2021-11-23 17:09:24,094 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3823 to 3823. [2021-11-23 17:09:24,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3823 states, 3821 states have (on average 1.5129547238942684) internal successors, (5781), 3822 states have internal predecessors, (5781), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:09:24,124 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3823 states to 3823 states and 5781 transitions. [2021-11-23 17:09:24,125 INFO L78 Accepts]: Start accepts. Automaton has 3823 states and 5781 transitions. Word has length 63 [2021-11-23 17:09:24,125 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:09:24,125 INFO L470 AbstractCegarLoop]: Abstraction has 3823 states and 5781 transitions. [2021-11-23 17:09:24,126 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.0) internal successors, (63), 2 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) [2021-11-23 17:09:24,126 INFO L276 IsEmpty]: Start isEmpty. Operand 3823 states and 5781 transitions. [2021-11-23 17:09:24,137 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-23 17:09:24,137 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:09:24,138 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:09:24,154 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (13)] Forceful destruction successful, exit code 0 [2021-11-23 17:09:24,354 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:09:24,354 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:09:24,355 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:09:24,355 INFO L85 PathProgramCache]: Analyzing trace with hash -484645446, now seen corresponding path program 1 times [2021-11-23 17:09:24,355 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:09:24,356 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1187000462] [2021-11-23 17:09:24,356 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:09:24,356 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:09:24,356 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:09:24,358 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:09:24,363 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2021-11-23 17:09:24,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:09:24,490 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:09:24,493 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:09:26,344 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:09:26,344 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:09:27,629 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:09:27,629 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:09:27,629 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1187000462] [2021-11-23 17:09:27,630 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1187000462] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:09:27,630 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [400696735] [2021-11-23 17:09:27,630 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:09:27,631 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:09:27,631 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:09:27,640 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:09:27,653 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (15)] Waiting until timeout for monitored process [2021-11-23 17:09:27,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:09:27,819 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:09:27,821 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:09:29,216 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:09:29,216 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:09:30,392 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:09:30,393 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [400696735] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:09:30,393 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [913328983] [2021-11-23 17:09:30,393 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:09:30,394 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:09:30,394 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:09:30,398 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:09:30,411 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-23 17:09:30,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:09:30,542 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:09:30,545 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:09:32,167 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:09:32,167 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:09:33,259 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:09:33,260 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [913328983] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:09:33,260 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:09:33,260 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:09:33,261 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [827947210] [2021-11-23 17:09:33,261 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:09:33,262 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:09:33,263 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:09:33,264 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:09:33,264 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:09:33,265 INFO L87 Difference]: Start difference. First operand 3823 states and 5781 transitions. Second operand has 16 states, 16 states have (on average 8.5625) internal successors, (137), 15 states have internal predecessors, (137), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:09:33,866 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:09:33,866 INFO L93 Difference]: Finished difference Result 5423 states and 8103 transitions. [2021-11-23 17:09:33,867 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-23 17:09:33,868 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 8.5625) internal successors, (137), 15 states have internal predecessors, (137), 0 states have call successors, (0), 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 79 [2021-11-23 17:09:33,868 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:09:33,891 INFO L225 Difference]: With dead ends: 5423 [2021-11-23 17:09:33,892 INFO L226 Difference]: Without dead ends: 3837 [2021-11-23 17:09:33,897 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 469 GetRequests, 454 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 63 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=56, Invalid=216, Unknown=0, NotChecked=0, Total=272 [2021-11-23 17:09:33,898 INFO L933 BasicCegarLoop]: 1521 mSDtfsCounter, 1475 mSDsluCounter, 14999 mSDsCounter, 0 mSdLazyCounter, 82 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1475 SdHoareTripleChecker+Valid, 16520 SdHoareTripleChecker+Invalid, 141 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 82 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 59 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:09:33,899 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1475 Valid, 16520 Invalid, 141 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 82 Invalid, 0 Unknown, 59 Unchecked, 0.2s Time] [2021-11-23 17:09:33,908 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3837 states. [2021-11-23 17:09:34,195 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3837 to 3836. [2021-11-23 17:09:34,219 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3836 states, 3834 states have (on average 1.5114762649973918) internal successors, (5795), 3835 states have internal predecessors, (5795), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:09:34,252 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3836 states to 3836 states and 5795 transitions. [2021-11-23 17:09:34,253 INFO L78 Accepts]: Start accepts. Automaton has 3836 states and 5795 transitions. Word has length 79 [2021-11-23 17:09:34,253 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:09:34,254 INFO L470 AbstractCegarLoop]: Abstraction has 3836 states and 5795 transitions. [2021-11-23 17:09:34,255 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 8.5625) internal successors, (137), 15 states have internal predecessors, (137), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:09:34,255 INFO L276 IsEmpty]: Start isEmpty. Operand 3836 states and 5795 transitions. [2021-11-23 17:09:34,259 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-23 17:09:34,259 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:09:34,260 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:09:34,283 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (14)] Forceful destruction successful, exit code 0 [2021-11-23 17:09:34,538 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-23 17:09:34,695 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (15)] Forceful destruction successful, exit code 0 [2021-11-23 17:09:34,882 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:09:34,883 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:09:34,883 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:09:34,884 INFO L85 PathProgramCache]: Analyzing trace with hash 1937719834, now seen corresponding path program 1 times [2021-11-23 17:09:34,884 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:09:34,884 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1152331260] [2021-11-23 17:09:34,885 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:09:34,885 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:09:34,885 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:09:34,888 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:09:34,931 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (17)] Waiting until timeout for monitored process [2021-11-23 17:09:35,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:09:35,045 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:09:35,048 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:09:37,857 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:09:37,857 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:09:38,663 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:09:38,664 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:09:38,664 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1152331260] [2021-11-23 17:09:38,664 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1152331260] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:09:38,664 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [894731349] [2021-11-23 17:09:38,664 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:09:38,665 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:09:38,665 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:09:38,666 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:09:38,668 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (18)] Waiting until timeout for monitored process [2021-11-23 17:09:38,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:09:38,857 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:09:38,860 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:09:41,121 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:09:41,122 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:09:41,667 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:09:41,668 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [894731349] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:09:41,668 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1801534840] [2021-11-23 17:09:41,668 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:09:41,669 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:09:41,669 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:09:41,671 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:09:41,672 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-23 17:09:41,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:09:41,792 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:09:41,820 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:09:43,811 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:09:43,811 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:09:44,345 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:09:44,345 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1801534840] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:09:44,345 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:09:44,346 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:09:44,346 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1714419538] [2021-11-23 17:09:44,347 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:09:44,348 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:09:44,349 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:09:44,349 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:09:44,350 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:09:44,350 INFO L87 Difference]: Start difference. First operand 3836 states and 5795 transitions. Second operand has 16 states, 16 states have (on average 8.9375) internal successors, (143), 15 states have internal predecessors, (143), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:09:45,132 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:09:45,133 INFO L93 Difference]: Finished difference Result 5515 states and 8206 transitions. [2021-11-23 17:09:45,133 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 17:09:45,134 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 8.9375) internal successors, (143), 15 states have internal predecessors, (143), 0 states have call successors, (0), 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 79 [2021-11-23 17:09:45,134 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:09:45,172 INFO L225 Difference]: With dead ends: 5515 [2021-11-23 17:09:45,173 INFO L226 Difference]: Without dead ends: 3929 [2021-11-23 17:09:45,179 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 472 GetRequests, 454 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=87, Invalid=293, Unknown=0, NotChecked=0, Total=380 [2021-11-23 17:09:45,180 INFO L933 BasicCegarLoop]: 1521 mSDtfsCounter, 7347 mSDsluCounter, 10643 mSDsCounter, 0 mSdLazyCounter, 87 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7347 SdHoareTripleChecker+Valid, 12164 SdHoareTripleChecker+Invalid, 239 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 87 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 147 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:09:45,181 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7347 Valid, 12164 Invalid, 239 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 87 Invalid, 0 Unknown, 147 Unchecked, 0.2s Time] [2021-11-23 17:09:45,191 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3929 states. [2021-11-23 17:09:45,392 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3929 to 3846. [2021-11-23 17:09:45,399 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3846 states, 3844 states have (on average 1.5111862643080125) internal successors, (5809), 3845 states have internal predecessors, (5809), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:09:45,412 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3846 states to 3846 states and 5809 transitions. [2021-11-23 17:09:45,413 INFO L78 Accepts]: Start accepts. Automaton has 3846 states and 5809 transitions. Word has length 79 [2021-11-23 17:09:45,413 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:09:45,413 INFO L470 AbstractCegarLoop]: Abstraction has 3846 states and 5809 transitions. [2021-11-23 17:09:45,414 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 8.9375) internal successors, (143), 15 states have internal predecessors, (143), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:09:45,414 INFO L276 IsEmpty]: Start isEmpty. Operand 3846 states and 5809 transitions. [2021-11-23 17:09:45,417 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-23 17:09:45,418 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:09:45,418 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:09:45,473 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-23 17:09:45,646 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (18)] Ended with exit code 0 [2021-11-23 17:09:45,858 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (17)] Forceful destruction successful, exit code 0 [2021-11-23 17:09:46,042 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:09:46,042 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:09:46,043 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:09:46,043 INFO L85 PathProgramCache]: Analyzing trace with hash 343435152, now seen corresponding path program 1 times [2021-11-23 17:09:46,044 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:09:46,044 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1974487635] [2021-11-23 17:09:46,044 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:09:46,045 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:09:46,045 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:09:46,047 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:09:46,066 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (20)] Waiting until timeout for monitored process [2021-11-23 17:09:46,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:09:46,177 INFO L263 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:09:46,178 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:09:46,383 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 15 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:09:46,383 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:09:46,383 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:09:46,384 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1974487635] [2021-11-23 17:09:46,384 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1974487635] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:09:46,384 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:09:46,384 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:09:46,384 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [785379791] [2021-11-23 17:09:46,384 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:09:46,385 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:09:46,385 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:09:46,386 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:09:46,386 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:09:46,387 INFO L87 Difference]: Start difference. First operand 3846 states and 5809 transitions. Second operand has 3 states, 3 states have (on average 26.333333333333332) internal successors, (79), 3 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:09:46,572 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:09:46,572 INFO L93 Difference]: Finished difference Result 6122 states and 9079 transitions. [2021-11-23 17:09:46,573 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:09:46,573 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 26.333333333333332) internal successors, (79), 3 states have internal predecessors, (79), 0 states have call successors, (0), 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 79 [2021-11-23 17:09:46,574 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:09:46,587 INFO L225 Difference]: With dead ends: 6122 [2021-11-23 17:09:46,588 INFO L226 Difference]: Without dead ends: 3848 [2021-11-23 17:09:46,594 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 77 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:09:46,595 INFO L933 BasicCegarLoop]: 1566 mSDtfsCounter, 40 mSDsluCounter, 1524 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 3090 SdHoareTripleChecker+Invalid, 6 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 6 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:09:46,595 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 3090 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:09:46,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3848 states. [2021-11-23 17:09:46,832 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3848 to 3846. [2021-11-23 17:09:46,840 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3846 states, 3844 states have (on average 1.5013007284079085) internal successors, (5771), 3845 states have internal predecessors, (5771), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:09:46,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3846 states to 3846 states and 5771 transitions. [2021-11-23 17:09:46,854 INFO L78 Accepts]: Start accepts. Automaton has 3846 states and 5771 transitions. Word has length 79 [2021-11-23 17:09:46,854 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:09:46,855 INFO L470 AbstractCegarLoop]: Abstraction has 3846 states and 5771 transitions. [2021-11-23 17:09:46,855 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 26.333333333333332) internal successors, (79), 3 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:09:46,855 INFO L276 IsEmpty]: Start isEmpty. Operand 3846 states and 5771 transitions. [2021-11-23 17:09:46,858 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-23 17:09:46,858 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:09:46,859 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:09:46,884 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (20)] Forceful destruction successful, exit code 0 [2021-11-23 17:09:47,072 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:09:47,073 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:09:47,074 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:09:47,074 INFO L85 PathProgramCache]: Analyzing trace with hash -838493520, now seen corresponding path program 1 times [2021-11-23 17:09:47,075 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:09:47,075 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1193946189] [2021-11-23 17:09:47,075 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:09:47,075 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:09:47,076 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:09:47,077 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:09:47,119 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (21)] Waiting until timeout for monitored process [2021-11-23 17:09:47,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:09:47,227 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:09:47,229 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:09:47,508 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 15 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:09:47,508 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:09:47,508 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:09:47,509 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1193946189] [2021-11-23 17:09:47,509 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1193946189] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:09:47,509 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:09:47,510 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:09:47,510 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [187418555] [2021-11-23 17:09:47,510 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:09:47,511 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:09:47,511 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:09:47,512 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:09:47,512 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:09:47,513 INFO L87 Difference]: Start difference. First operand 3846 states and 5771 transitions. Second operand has 3 states, 3 states have (on average 26.333333333333332) internal successors, (79), 3 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:09:47,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:09:47,617 INFO L93 Difference]: Finished difference Result 4666 states and 6941 transitions. [2021-11-23 17:09:47,617 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:09:47,618 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 26.333333333333332) internal successors, (79), 3 states have internal predecessors, (79), 0 states have call successors, (0), 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 79 [2021-11-23 17:09:47,618 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:09:47,625 INFO L225 Difference]: With dead ends: 4666 [2021-11-23 17:09:47,626 INFO L226 Difference]: Without dead ends: 2392 [2021-11-23 17:09:47,630 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 77 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:09:47,631 INFO L933 BasicCegarLoop]: 1561 mSDtfsCounter, 34 mSDsluCounter, 1520 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 3081 SdHoareTripleChecker+Invalid, 6 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 6 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:09:47,632 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [34 Valid, 3081 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:09:47,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2392 states. [2021-11-23 17:09:47,732 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2392 to 2384. [2021-11-23 17:09:47,738 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2384 states, 2382 states have (on average 1.5478589420654911) internal successors, (3687), 2383 states have internal predecessors, (3687), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:09:47,746 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2384 states to 2384 states and 3687 transitions. [2021-11-23 17:09:47,746 INFO L78 Accepts]: Start accepts. Automaton has 2384 states and 3687 transitions. Word has length 79 [2021-11-23 17:09:47,747 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:09:47,747 INFO L470 AbstractCegarLoop]: Abstraction has 2384 states and 3687 transitions. [2021-11-23 17:09:47,747 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 26.333333333333332) internal successors, (79), 3 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:09:47,748 INFO L276 IsEmpty]: Start isEmpty. Operand 2384 states and 3687 transitions. [2021-11-23 17:09:47,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-23 17:09:47,750 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:09:47,751 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:09:47,770 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (21)] Forceful destruction successful, exit code 0 [2021-11-23 17:09:47,966 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:09:47,966 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:09:47,967 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:09:47,967 INFO L85 PathProgramCache]: Analyzing trace with hash 223555904, now seen corresponding path program 1 times [2021-11-23 17:09:47,968 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:09:47,968 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1952459727] [2021-11-23 17:09:47,968 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:09:47,968 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:09:47,969 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:09:47,971 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:09:48,005 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (22)] Waiting until timeout for monitored process [2021-11-23 17:09:48,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:09:48,147 INFO L263 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:09:48,151 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:09:49,006 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:09:49,007 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:09:49,007 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:09:49,007 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1952459727] [2021-11-23 17:09:49,008 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1952459727] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:09:49,008 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:09:49,008 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:09:49,009 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [22554195] [2021-11-23 17:09:49,009 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:09:49,010 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:09:49,010 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:09:49,011 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:09:49,011 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:09:49,011 INFO L87 Difference]: Start difference. First operand 2384 states and 3687 transitions. Second operand has 6 states, 6 states have (on average 12.333333333333334) internal successors, (74), 5 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:09:49,187 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:09:49,187 INFO L93 Difference]: Finished difference Result 3192 states and 4832 transitions. [2021-11-23 17:09:49,188 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:09:49,188 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 12.333333333333334) internal successors, (74), 5 states have internal predecessors, (74), 0 states have call successors, (0), 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 79 [2021-11-23 17:09:49,188 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:09:49,194 INFO L225 Difference]: With dead ends: 3192 [2021-11-23 17:09:49,194 INFO L226 Difference]: Without dead ends: 2384 [2021-11-23 17:09:49,197 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 74 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:09:49,198 INFO L933 BasicCegarLoop]: 1529 mSDtfsCounter, 2913 mSDsluCounter, 2967 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2913 SdHoareTripleChecker+Valid, 4496 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 14 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:09:49,199 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2913 Valid, 4496 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 22 Invalid, 0 Unknown, 14 Unchecked, 0.1s Time] [2021-11-23 17:09:49,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2384 states. [2021-11-23 17:09:49,303 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2384 to 2384. [2021-11-23 17:09:49,309 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2384 states, 2382 states have (on average 1.547439126784215) internal successors, (3686), 2383 states have internal predecessors, (3686), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:09:49,317 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2384 states to 2384 states and 3686 transitions. [2021-11-23 17:09:49,318 INFO L78 Accepts]: Start accepts. Automaton has 2384 states and 3686 transitions. Word has length 79 [2021-11-23 17:09:49,318 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:09:49,318 INFO L470 AbstractCegarLoop]: Abstraction has 2384 states and 3686 transitions. [2021-11-23 17:09:49,319 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 12.333333333333334) internal successors, (74), 5 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:09:49,319 INFO L276 IsEmpty]: Start isEmpty. Operand 2384 states and 3686 transitions. [2021-11-23 17:09:49,321 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-23 17:09:49,322 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:09:49,322 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:09:49,350 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (22)] Forceful destruction successful, exit code 0 [2021-11-23 17:09:49,538 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:09:49,538 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:09:49,538 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:09:49,539 INFO L85 PathProgramCache]: Analyzing trace with hash 767860800, now seen corresponding path program 1 times [2021-11-23 17:09:49,539 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:09:49,540 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1195285213] [2021-11-23 17:09:49,540 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:09:49,540 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:09:49,540 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:09:49,542 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:09:49,544 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (23)] Waiting until timeout for monitored process [2021-11-23 17:09:49,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:09:49,677 INFO L263 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:09:49,679 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:09:50,603 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 17:09:50,603 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:09:50,604 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:09:50,604 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1195285213] [2021-11-23 17:09:50,604 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1195285213] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:09:50,604 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:09:50,604 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:09:50,605 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [175662026] [2021-11-23 17:09:50,605 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:09:50,605 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:09:50,606 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:09:50,606 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:09:50,606 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:09:50,607 INFO L87 Difference]: Start difference. First operand 2384 states and 3686 transitions. Second operand has 6 states, 6 states have (on average 12.166666666666666) internal successors, (73), 5 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:09:50,918 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:09:50,918 INFO L93 Difference]: Finished difference Result 3178 states and 4815 transitions. [2021-11-23 17:09:50,919 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:09:50,919 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 12.166666666666666) internal successors, (73), 5 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 79 [2021-11-23 17:09:50,920 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:09:50,928 INFO L225 Difference]: With dead ends: 3178 [2021-11-23 17:09:50,928 INFO L226 Difference]: Without dead ends: 2366 [2021-11-23 17:09:50,931 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 74 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:09:50,932 INFO L933 BasicCegarLoop]: 1532 mSDtfsCounter, 1465 mSDsluCounter, 2996 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1465 SdHoareTripleChecker+Valid, 4528 SdHoareTripleChecker+Invalid, 62 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 52 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 9 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:09:50,933 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1465 Valid, 4528 Invalid, 62 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 52 Invalid, 0 Unknown, 9 Unchecked, 0.2s Time] [2021-11-23 17:09:50,938 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2366 states. [2021-11-23 17:09:51,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2366 to 2366. [2021-11-23 17:09:51,082 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2366 states, 2364 states have (on average 1.5499153976311337) internal successors, (3664), 2365 states have internal predecessors, (3664), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:09:51,090 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2366 states to 2366 states and 3664 transitions. [2021-11-23 17:09:51,090 INFO L78 Accepts]: Start accepts. Automaton has 2366 states and 3664 transitions. Word has length 79 [2021-11-23 17:09:51,090 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:09:51,091 INFO L470 AbstractCegarLoop]: Abstraction has 2366 states and 3664 transitions. [2021-11-23 17:09:51,091 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 12.166666666666666) internal successors, (73), 5 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:09:51,091 INFO L276 IsEmpty]: Start isEmpty. Operand 2366 states and 3664 transitions. [2021-11-23 17:09:51,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-11-23 17:09:51,093 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:09:51,094 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:09:51,114 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (23)] Forceful destruction successful, exit code 0 [2021-11-23 17:09:51,309 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:09:51,310 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:09:51,310 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:09:51,311 INFO L85 PathProgramCache]: Analyzing trace with hash -1077447154, now seen corresponding path program 1 times [2021-11-23 17:09:51,311 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:09:51,311 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1076637997] [2021-11-23 17:09:51,311 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:09:51,312 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:09:51,312 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:09:51,313 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:09:51,331 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (24)] Waiting until timeout for monitored process [2021-11-23 17:09:51,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:09:51,468 INFO L263 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:09:51,471 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:09:53,564 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:09:53,564 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:09:54,408 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:09:54,408 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:09:54,408 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1076637997] [2021-11-23 17:09:54,409 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1076637997] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:09:54,409 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1736856408] [2021-11-23 17:09:54,409 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:09:54,409 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:09:54,409 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:09:54,414 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:09:54,453 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (25)] Waiting until timeout for monitored process [2021-11-23 17:09:54,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:09:54,595 INFO L263 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:09:54,597 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:09:56,417 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:09:56,417 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:09:57,093 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:09:57,094 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1736856408] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:09:57,094 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [199583956] [2021-11-23 17:09:57,094 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:09:57,094 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:09:57,094 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:09:57,096 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:09:57,097 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-11-23 17:09:57,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:09:57,204 INFO L263 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:09:57,207 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:09:59,290 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:09:59,290 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:09:59,987 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:09:59,987 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [199583956] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:09:59,987 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:09:59,988 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:09:59,988 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1008233173] [2021-11-23 17:09:59,988 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:09:59,990 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:09:59,990 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:09:59,991 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:09:59,991 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:09:59,992 INFO L87 Difference]: Start difference. First operand 2366 states and 3664 transitions. Second operand has 16 states, 16 states have (on average 9.3125) internal successors, (149), 15 states have internal predecessors, (149), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:10:00,493 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:10:00,494 INFO L93 Difference]: Finished difference Result 3174 states and 4817 transitions. [2021-11-23 17:10:00,494 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 17:10:00,495 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 9.3125) internal successors, (149), 15 states have internal predecessors, (149), 0 states have call successors, (0), 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 80 [2021-11-23 17:10:00,495 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:10:00,505 INFO L225 Difference]: With dead ends: 3174 [2021-11-23 17:10:00,506 INFO L226 Difference]: Without dead ends: 2380 [2021-11-23 17:10:00,509 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 478 GetRequests, 460 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=84, Invalid=296, Unknown=0, NotChecked=0, Total=380 [2021-11-23 17:10:00,542 INFO L933 BasicCegarLoop]: 1518 mSDtfsCounter, 5869 mSDsluCounter, 10631 mSDsCounter, 0 mSdLazyCounter, 62 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5869 SdHoareTripleChecker+Valid, 12149 SdHoareTripleChecker+Invalid, 140 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 62 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 75 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:10:00,542 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5869 Valid, 12149 Invalid, 140 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 62 Invalid, 0 Unknown, 75 Unchecked, 0.1s Time] [2021-11-23 17:10:00,548 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2380 states. [2021-11-23 17:10:00,634 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2380 to 2378. [2021-11-23 17:10:00,638 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2378 states, 2376 states have (on average 1.5496632996632997) internal successors, (3682), 2377 states have internal predecessors, (3682), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:10:00,644 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2378 states to 2378 states and 3682 transitions. [2021-11-23 17:10:00,647 INFO L78 Accepts]: Start accepts. Automaton has 2378 states and 3682 transitions. Word has length 80 [2021-11-23 17:10:00,647 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:10:00,647 INFO L470 AbstractCegarLoop]: Abstraction has 2378 states and 3682 transitions. [2021-11-23 17:10:00,648 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 9.3125) internal successors, (149), 15 states have internal predecessors, (149), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:10:00,648 INFO L276 IsEmpty]: Start isEmpty. Operand 2378 states and 3682 transitions. [2021-11-23 17:10:00,650 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-11-23 17:10:00,650 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:10:00,650 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:10:00,668 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (24)] Forceful destruction successful, exit code 0 [2021-11-23 17:10:00,873 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (25)] Forceful destruction successful, exit code 0 [2021-11-23 17:10:01,099 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Ended with exit code 0 [2021-11-23 17:10:01,266 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:10:01,266 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:10:01,267 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:10:01,267 INFO L85 PathProgramCache]: Analyzing trace with hash -481488574, now seen corresponding path program 1 times [2021-11-23 17:10:01,267 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:10:01,267 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1853808590] [2021-11-23 17:10:01,268 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:10:01,268 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:10:01,268 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:10:01,269 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:10:01,272 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (27)] Waiting until timeout for monitored process [2021-11-23 17:10:01,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:10:01,374 INFO L263 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:10:01,376 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:10:01,578 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 15 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:10:01,578 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:10:01,578 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:10:01,578 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1853808590] [2021-11-23 17:10:01,578 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1853808590] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:10:01,579 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:10:01,579 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:10:01,579 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1234904317] [2021-11-23 17:10:01,579 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:10:01,580 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:10:01,580 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:10:01,580 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:10:01,580 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:10:01,580 INFO L87 Difference]: Start difference. First operand 2378 states and 3682 transitions. Second operand has 3 states, 3 states have (on average 26.666666666666668) internal successors, (80), 3 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) [2021-11-23 17:10:01,644 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:10:01,645 INFO L93 Difference]: Finished difference Result 2778 states and 4248 transitions. [2021-11-23 17:10:01,645 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:10:01,646 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 26.666666666666668) internal successors, (80), 3 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) Word has length 80 [2021-11-23 17:10:01,646 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:10:01,654 INFO L225 Difference]: With dead ends: 2778 [2021-11-23 17:10:01,654 INFO L226 Difference]: Without dead ends: 1984 [2021-11-23 17:10:01,656 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 78 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:10:01,658 INFO L933 BasicCegarLoop]: 1556 mSDtfsCounter, 31 mSDsluCounter, 1508 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 3064 SdHoareTripleChecker+Invalid, 6 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 6 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:10:01,658 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [31 Valid, 3064 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:10:01,663 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1984 states. [2021-11-23 17:10:01,731 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1984 to 1982. [2021-11-23 17:10:01,735 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1982 states, 1980 states have (on average 1.5707070707070707) internal successors, (3110), 1981 states have internal predecessors, (3110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:10:01,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1982 states to 1982 states and 3110 transitions. [2021-11-23 17:10:01,743 INFO L78 Accepts]: Start accepts. Automaton has 1982 states and 3110 transitions. Word has length 80 [2021-11-23 17:10:01,743 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:10:01,744 INFO L470 AbstractCegarLoop]: Abstraction has 1982 states and 3110 transitions. [2021-11-23 17:10:01,744 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 26.666666666666668) internal successors, (80), 3 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) [2021-11-23 17:10:01,744 INFO L276 IsEmpty]: Start isEmpty. Operand 1982 states and 3110 transitions. [2021-11-23 17:10:01,746 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-11-23 17:10:01,746 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:10:01,747 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:10:01,776 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (27)] Forceful destruction successful, exit code 0 [2021-11-23 17:10:01,963 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:10:01,963 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:10:01,964 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:10:01,964 INFO L85 PathProgramCache]: Analyzing trace with hash -362198703, now seen corresponding path program 1 times [2021-11-23 17:10:01,964 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:10:01,964 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1073591975] [2021-11-23 17:10:01,965 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:10:01,965 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:10:01,965 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:10:01,967 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:10:02,017 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (28)] Waiting until timeout for monitored process [2021-11-23 17:10:02,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:10:02,089 INFO L263 TraceCheckSpWp]: Trace formula consists of 192 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:10:02,091 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:10:04,425 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:10:04,426 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:10:05,535 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:10:05,536 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:10:05,536 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1073591975] [2021-11-23 17:10:05,536 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1073591975] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:10:05,536 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [114544324] [2021-11-23 17:10:05,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:10:05,537 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:10:05,537 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:10:05,538 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:10:05,541 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (29)] Waiting until timeout for monitored process [2021-11-23 17:10:05,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:10:05,727 INFO L263 TraceCheckSpWp]: Trace formula consists of 192 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:10:05,728 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:10:07,768 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:10:07,768 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:10:08,566 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:10:08,567 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [114544324] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:10:08,567 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2144599470] [2021-11-23 17:10:08,567 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:10:08,568 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:10:08,568 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:10:08,572 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:10:08,574 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2021-11-23 17:10:08,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:10:08,703 INFO L263 TraceCheckSpWp]: Trace formula consists of 192 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:10:08,706 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:10:10,917 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:10:10,917 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:10:11,742 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:10:11,742 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2144599470] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:10:11,742 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:10:11,743 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:10:11,743 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1255787761] [2021-11-23 17:10:11,743 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:10:11,744 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:10:11,744 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:10:11,745 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:10:11,746 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:10:11,746 INFO L87 Difference]: Start difference. First operand 1982 states and 3110 transitions. Second operand has 16 states, 16 states have (on average 9.6875) internal successors, (155), 15 states have internal predecessors, (155), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:10:12,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:10:12,222 INFO L93 Difference]: Finished difference Result 2394 states and 3693 transitions. [2021-11-23 17:10:12,222 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 17:10:12,222 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 9.6875) internal successors, (155), 15 states have internal predecessors, (155), 0 states have call successors, (0), 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 81 [2021-11-23 17:10:12,223 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:10:12,226 INFO L225 Difference]: With dead ends: 2394 [2021-11-23 17:10:12,226 INFO L226 Difference]: Without dead ends: 1996 [2021-11-23 17:10:12,228 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 484 GetRequests, 466 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=87, Invalid=293, Unknown=0, NotChecked=0, Total=380 [2021-11-23 17:10:12,229 INFO L933 BasicCegarLoop]: 1516 mSDtfsCounter, 5837 mSDsluCounter, 7867 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5837 SdHoareTripleChecker+Valid, 9383 SdHoareTripleChecker+Invalid, 150 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 81 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:10:12,230 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5837 Valid, 9383 Invalid, 150 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 65 Invalid, 0 Unknown, 81 Unchecked, 0.1s Time] [2021-11-23 17:10:12,235 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1996 states. [2021-11-23 17:10:12,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1996 to 1994. [2021-11-23 17:10:12,292 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1994 states, 1992 states have (on average 1.570281124497992) internal successors, (3128), 1993 states have internal predecessors, (3128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:10:12,297 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1994 states to 1994 states and 3128 transitions. [2021-11-23 17:10:12,297 INFO L78 Accepts]: Start accepts. Automaton has 1994 states and 3128 transitions. Word has length 81 [2021-11-23 17:10:12,298 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:10:12,298 INFO L470 AbstractCegarLoop]: Abstraction has 1994 states and 3128 transitions. [2021-11-23 17:10:12,298 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 9.6875) internal successors, (155), 15 states have internal predecessors, (155), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:10:12,299 INFO L276 IsEmpty]: Start isEmpty. Operand 1994 states and 3128 transitions. [2021-11-23 17:10:12,300 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-11-23 17:10:12,300 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:10:12,301 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:10:12,347 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2021-11-23 17:10:12,528 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (28)] Forceful destruction successful, exit code 0 [2021-11-23 17:10:12,719 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (29)] Forceful destruction successful, exit code 0 [2021-11-23 17:10:12,918 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:10:12,918 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:10:12,918 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:10:12,919 INFO L85 PathProgramCache]: Analyzing trace with hash 46440069, now seen corresponding path program 1 times [2021-11-23 17:10:12,919 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:10:12,919 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1160138803] [2021-11-23 17:10:12,919 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:10:12,919 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:10:12,919 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:10:12,920 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:10:12,922 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (31)] Waiting until timeout for monitored process [2021-11-23 17:10:13,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:10:13,006 INFO L263 TraceCheckSpWp]: Trace formula consists of 192 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:10:13,007 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:10:13,183 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 15 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:10:13,183 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:10:13,183 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:10:13,183 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1160138803] [2021-11-23 17:10:13,183 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1160138803] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:10:13,183 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:10:13,184 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:10:13,184 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [798741130] [2021-11-23 17:10:13,184 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:10:13,184 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:10:13,184 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:10:13,185 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:10:13,185 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:10:13,185 INFO L87 Difference]: Start difference. First operand 1994 states and 3128 transitions. Second operand has 3 states, 3 states have (on average 27.0) internal successors, (81), 3 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:10:13,244 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:10:13,245 INFO L93 Difference]: Finished difference Result 2196 states and 3409 transitions. [2021-11-23 17:10:13,247 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:10:13,248 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.0) internal successors, (81), 3 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 81 [2021-11-23 17:10:13,248 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:10:13,251 INFO L225 Difference]: With dead ends: 2196 [2021-11-23 17:10:13,252 INFO L226 Difference]: Without dead ends: 1798 [2021-11-23 17:10:13,253 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 79 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:10:13,254 INFO L933 BasicCegarLoop]: 1548 mSDtfsCounter, 26 mSDsluCounter, 1500 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 3048 SdHoareTripleChecker+Invalid, 6 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 6 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:10:13,255 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 3048 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:10:13,257 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1798 states. [2021-11-23 17:10:13,304 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1798 to 1796. [2021-11-23 17:10:13,307 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1796 states, 1794 states have (on average 1.585284280936455) internal successors, (2844), 1795 states have internal predecessors, (2844), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:10:13,312 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1796 states to 1796 states and 2844 transitions. [2021-11-23 17:10:13,312 INFO L78 Accepts]: Start accepts. Automaton has 1796 states and 2844 transitions. Word has length 81 [2021-11-23 17:10:13,313 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:10:13,313 INFO L470 AbstractCegarLoop]: Abstraction has 1796 states and 2844 transitions. [2021-11-23 17:10:13,313 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.0) internal successors, (81), 3 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:10:13,313 INFO L276 IsEmpty]: Start isEmpty. Operand 1796 states and 2844 transitions. [2021-11-23 17:10:13,315 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-11-23 17:10:13,315 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:10:13,315 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:10:13,332 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (31)] Forceful destruction successful, exit code 0 [2021-11-23 17:10:13,530 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:10:13,530 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:10:13,530 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:10:13,530 INFO L85 PathProgramCache]: Analyzing trace with hash -126068059, now seen corresponding path program 1 times [2021-11-23 17:10:13,531 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:10:13,531 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1735281749] [2021-11-23 17:10:13,531 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:10:13,531 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:10:13,531 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:10:13,532 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:10:13,545 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (32)] Waiting until timeout for monitored process [2021-11-23 17:10:13,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:10:13,630 INFO L263 TraceCheckSpWp]: Trace formula consists of 194 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:10:13,632 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:10:14,803 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:10:14,803 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:10:14,804 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:10:14,804 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1735281749] [2021-11-23 17:10:14,804 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1735281749] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:10:14,804 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:10:14,804 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 17:10:14,804 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [54420491] [2021-11-23 17:10:14,804 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:10:14,805 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:10:14,805 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:10:14,805 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:10:14,806 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:10:14,806 INFO L87 Difference]: Start difference. First operand 1796 states and 2844 transitions. Second operand has 6 states, 6 states have (on average 13.0) internal successors, (78), 6 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:10:14,987 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:10:14,987 INFO L93 Difference]: Finished difference Result 2150 states and 3329 transitions. [2021-11-23 17:10:14,987 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 17:10:14,987 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.0) internal successors, (78), 6 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 82 [2021-11-23 17:10:14,988 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:10:14,992 INFO L225 Difference]: With dead ends: 2150 [2021-11-23 17:10:14,992 INFO L226 Difference]: Without dead ends: 1950 [2021-11-23 17:10:14,994 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 77 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:10:14,994 INFO L933 BasicCegarLoop]: 1602 mSDtfsCounter, 3179 mSDsluCounter, 1713 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3179 SdHoareTripleChecker+Valid, 3315 SdHoareTripleChecker+Invalid, 47 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:10:14,995 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3179 Valid, 3315 Invalid, 47 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:10:14,998 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1950 states. [2021-11-23 17:10:15,045 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1950 to 1796. [2021-11-23 17:10:15,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1796 states, 1794 states have (on average 1.5819397993311037) internal successors, (2838), 1795 states have internal predecessors, (2838), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:10:15,052 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1796 states to 1796 states and 2838 transitions. [2021-11-23 17:10:15,053 INFO L78 Accepts]: Start accepts. Automaton has 1796 states and 2838 transitions. Word has length 82 [2021-11-23 17:10:15,053 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:10:15,053 INFO L470 AbstractCegarLoop]: Abstraction has 1796 states and 2838 transitions. [2021-11-23 17:10:15,053 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.0) internal successors, (78), 6 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:10:15,054 INFO L276 IsEmpty]: Start isEmpty. Operand 1796 states and 2838 transitions. [2021-11-23 17:10:15,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-11-23 17:10:15,055 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:10:15,056 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:10:15,074 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (32)] Forceful destruction successful, exit code 0 [2021-11-23 17:10:15,274 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:10:15,274 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:10:15,275 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:10:15,275 INFO L85 PathProgramCache]: Analyzing trace with hash 1376291048, now seen corresponding path program 1 times [2021-11-23 17:10:15,275 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:10:15,275 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2134608417] [2021-11-23 17:10:15,275 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:10:15,275 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:10:15,276 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:10:15,276 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:10:15,277 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (33)] Waiting until timeout for monitored process [2021-11-23 17:10:15,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:10:15,366 INFO L263 TraceCheckSpWp]: Trace formula consists of 194 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:10:15,368 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:10:16,668 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:10:16,669 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:10:16,669 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:10:16,669 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2134608417] [2021-11-23 17:10:16,669 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2134608417] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:10:16,669 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:10:16,670 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 17:10:16,670 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [130553467] [2021-11-23 17:10:16,670 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:10:16,670 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:10:16,670 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:10:16,671 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:10:16,671 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:10:16,671 INFO L87 Difference]: Start difference. First operand 1796 states and 2838 transitions. Second operand has 6 states, 6 states have (on average 13.166666666666666) internal successors, (79), 6 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:10:16,967 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:10:16,967 INFO L93 Difference]: Finished difference Result 2084 states and 3235 transitions. [2021-11-23 17:10:16,967 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 17:10:16,968 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.166666666666666) internal successors, (79), 6 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 82 [2021-11-23 17:10:16,968 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:10:16,972 INFO L225 Difference]: With dead ends: 2084 [2021-11-23 17:10:16,972 INFO L226 Difference]: Without dead ends: 2016 [2021-11-23 17:10:16,973 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 77 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:10:16,974 INFO L933 BasicCegarLoop]: 1610 mSDtfsCounter, 3230 mSDsluCounter, 1787 mSDsCounter, 0 mSdLazyCounter, 61 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3230 SdHoareTripleChecker+Valid, 3397 SdHoareTripleChecker+Invalid, 65 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 61 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:10:16,975 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3230 Valid, 3397 Invalid, 65 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 61 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 17:10:16,978 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2016 states. [2021-11-23 17:10:17,050 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2016 to 1866. [2021-11-23 17:10:17,054 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1866 states, 1864 states have (on average 1.5718884120171674) internal successors, (2930), 1865 states have internal predecessors, (2930), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:10:17,059 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1866 states to 1866 states and 2930 transitions. [2021-11-23 17:10:17,059 INFO L78 Accepts]: Start accepts. Automaton has 1866 states and 2930 transitions. Word has length 82 [2021-11-23 17:10:17,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:10:17,060 INFO L470 AbstractCegarLoop]: Abstraction has 1866 states and 2930 transitions. [2021-11-23 17:10:17,060 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.166666666666666) internal successors, (79), 6 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:10:17,061 INFO L276 IsEmpty]: Start isEmpty. Operand 1866 states and 2930 transitions. [2021-11-23 17:10:17,062 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-11-23 17:10:17,062 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:10:17,063 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:10:17,081 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (33)] Forceful destruction successful, exit code 0 [2021-11-23 17:10:17,281 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:10:17,281 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:10:17,282 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:10:17,282 INFO L85 PathProgramCache]: Analyzing trace with hash 20827269, now seen corresponding path program 1 times [2021-11-23 17:10:17,282 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:10:17,282 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2042239765] [2021-11-23 17:10:17,283 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:10:17,283 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:10:17,283 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:10:17,285 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:10:17,325 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (34)] Waiting until timeout for monitored process [2021-11-23 17:10:17,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:10:17,423 INFO L263 TraceCheckSpWp]: Trace formula consists of 194 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:10:17,425 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:10:18,823 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:10:18,823 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:10:18,824 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:10:18,824 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2042239765] [2021-11-23 17:10:18,824 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2042239765] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:10:18,825 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:10:18,825 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 17:10:18,825 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [131891925] [2021-11-23 17:10:18,825 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:10:18,826 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:10:18,826 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:10:18,826 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:10:18,826 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:10:18,827 INFO L87 Difference]: Start difference. First operand 1866 states and 2930 transitions. Second operand has 6 states, 6 states have (on average 13.333333333333334) internal successors, (80), 6 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) [2021-11-23 17:10:19,062 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:10:19,062 INFO L93 Difference]: Finished difference Result 2154 states and 3327 transitions. [2021-11-23 17:10:19,063 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 17:10:19,063 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.333333333333334) internal successors, (80), 6 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) Word has length 82 [2021-11-23 17:10:19,063 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:10:19,066 INFO L225 Difference]: With dead ends: 2154 [2021-11-23 17:10:19,066 INFO L226 Difference]: Without dead ends: 2086 [2021-11-23 17:10:19,067 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 77 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:10:19,068 INFO L933 BasicCegarLoop]: 1617 mSDtfsCounter, 4691 mSDsluCounter, 1705 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4691 SdHoareTripleChecker+Valid, 3322 SdHoareTripleChecker+Invalid, 47 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:10:19,068 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4691 Valid, 3322 Invalid, 47 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 17:10:19,071 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2086 states. [2021-11-23 17:10:19,149 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2086 to 1942. [2021-11-23 17:10:19,152 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1942 states, 1940 states have (on average 1.5618556701030928) internal successors, (3030), 1941 states have internal predecessors, (3030), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:10:19,158 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1942 states to 1942 states and 3030 transitions. [2021-11-23 17:10:19,159 INFO L78 Accepts]: Start accepts. Automaton has 1942 states and 3030 transitions. Word has length 82 [2021-11-23 17:10:19,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:10:19,160 INFO L470 AbstractCegarLoop]: Abstraction has 1942 states and 3030 transitions. [2021-11-23 17:10:19,160 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.333333333333334) internal successors, (80), 6 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) [2021-11-23 17:10:19,161 INFO L276 IsEmpty]: Start isEmpty. Operand 1942 states and 3030 transitions. [2021-11-23 17:10:19,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-11-23 17:10:19,163 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:10:19,163 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:10:19,184 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (34)] Forceful destruction successful, exit code 0 [2021-11-23 17:10:19,377 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:10:19,378 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:10:19,378 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:10:19,379 INFO L85 PathProgramCache]: Analyzing trace with hash -339524856, now seen corresponding path program 1 times [2021-11-23 17:10:19,379 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:10:19,379 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1911976493] [2021-11-23 17:10:19,380 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:10:19,380 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:10:19,380 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:10:19,382 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:10:19,429 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (35)] Waiting until timeout for monitored process [2021-11-23 17:10:19,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:10:19,532 INFO L263 TraceCheckSpWp]: Trace formula consists of 194 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:10:19,535 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:10:20,960 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:10:20,960 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:10:20,960 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:10:20,960 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1911976493] [2021-11-23 17:10:20,960 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1911976493] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:10:20,961 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:10:20,961 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 17:10:20,961 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [909291630] [2021-11-23 17:10:20,961 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:10:20,961 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:10:20,962 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:10:20,962 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:10:20,962 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:10:20,963 INFO L87 Difference]: Start difference. First operand 1942 states and 3030 transitions. Second operand has 6 states, 6 states have (on average 13.5) internal successors, (81), 6 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:10:21,183 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:10:21,183 INFO L93 Difference]: Finished difference Result 2230 states and 3427 transitions. [2021-11-23 17:10:21,185 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 17:10:21,185 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.5) internal successors, (81), 6 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 82 [2021-11-23 17:10:21,185 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:10:21,188 INFO L225 Difference]: With dead ends: 2230 [2021-11-23 17:10:21,188 INFO L226 Difference]: Without dead ends: 2162 [2021-11-23 17:10:21,189 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 77 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:10:21,190 INFO L933 BasicCegarLoop]: 1606 mSDtfsCounter, 3171 mSDsluCounter, 1718 mSDsCounter, 0 mSdLazyCounter, 45 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3171 SdHoareTripleChecker+Valid, 3324 SdHoareTripleChecker+Invalid, 49 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 45 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:10:21,191 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3171 Valid, 3324 Invalid, 49 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 45 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 17:10:21,194 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2162 states. [2021-11-23 17:10:21,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2162 to 2018. [2021-11-23 17:10:21,274 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2018 states, 2016 states have (on average 1.5525793650793651) internal successors, (3130), 2017 states have internal predecessors, (3130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:10:21,280 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2018 states to 2018 states and 3130 transitions. [2021-11-23 17:10:21,281 INFO L78 Accepts]: Start accepts. Automaton has 2018 states and 3130 transitions. Word has length 82 [2021-11-23 17:10:21,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:10:21,282 INFO L470 AbstractCegarLoop]: Abstraction has 2018 states and 3130 transitions. [2021-11-23 17:10:21,282 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.5) internal successors, (81), 6 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:10:21,282 INFO L276 IsEmpty]: Start isEmpty. Operand 2018 states and 3130 transitions. [2021-11-23 17:10:21,284 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-11-23 17:10:21,284 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:10:21,285 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:10:21,305 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (35)] Forceful destruction successful, exit code 0 [2021-11-23 17:10:21,498 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:10:21,498 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:10:21,498 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:10:21,499 INFO L85 PathProgramCache]: Analyzing trace with hash -1782997605, now seen corresponding path program 1 times [2021-11-23 17:10:21,499 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:10:21,499 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1966101615] [2021-11-23 17:10:21,499 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:10:21,500 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:10:21,500 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:10:21,501 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:10:21,504 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (36)] Waiting until timeout for monitored process [2021-11-23 17:10:21,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:10:21,618 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 31 conjunts are in the unsatisfiable core [2021-11-23 17:10:21,621 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:10:31,588 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:10:31,589 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:10:37,385 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:10:37,385 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:10:37,385 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1966101615] [2021-11-23 17:10:37,385 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1966101615] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:10:37,386 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [427976366] [2021-11-23 17:10:37,386 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:10:37,386 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:10:37,386 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:10:37,387 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:10:37,390 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (37)] Waiting until timeout for monitored process [2021-11-23 17:10:37,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:10:37,597 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 33 conjunts are in the unsatisfiable core [2021-11-23 17:10:37,600 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:10:44,366 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:10:44,366 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:10:46,847 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:10:46,847 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [427976366] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:10:46,848 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2130391481] [2021-11-23 17:10:46,848 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:10:46,848 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:10:46,848 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:10:46,849 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:10:46,850 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2021-11-23 17:10:46,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:10:46,955 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-23 17:10:46,957 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:10:51,481 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:10:51,482 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:10:53,459 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:10:53,459 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2130391481] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:10:53,459 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:10:53,460 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 24, 28, 24, 10, 9] total 65 [2021-11-23 17:10:53,460 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [505511574] [2021-11-23 17:10:53,461 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:10:53,463 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 65 states [2021-11-23 17:10:53,464 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:10:53,466 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2021-11-23 17:10:53,469 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=531, Invalid=3629, Unknown=0, NotChecked=0, Total=4160 [2021-11-23 17:10:53,470 INFO L87 Difference]: Start difference. First operand 2018 states and 3130 transitions. Second operand has 65 states, 65 states have (on average 4.292307692307692) internal successors, (279), 65 states have internal predecessors, (279), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:10:57,156 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:10:57,156 INFO L93 Difference]: Finished difference Result 2337 states and 3539 transitions. [2021-11-23 17:10:57,157 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-11-23 17:10:57,157 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 65 states have (on average 4.292307692307692) internal successors, (279), 65 states have internal predecessors, (279), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 83 [2021-11-23 17:10:57,210 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:10:57,214 INFO L225 Difference]: With dead ends: 2337 [2021-11-23 17:10:57,214 INFO L226 Difference]: Without dead ends: 2199 [2021-11-23 17:10:57,218 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 496 GetRequests, 428 SyntacticMatches, 2 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1835 ImplicationChecksByTransitivity, 13.0s TimeCoverageRelationStatistics Valid=628, Invalid=3928, Unknown=0, NotChecked=0, Total=4556 [2021-11-23 17:10:57,219 INFO L933 BasicCegarLoop]: 1535 mSDtfsCounter, 17546 mSDsluCounter, 27790 mSDsCounter, 0 mSdLazyCounter, 465 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17546 SdHoareTripleChecker+Valid, 29325 SdHoareTripleChecker+Invalid, 671 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.2s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 465 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 180 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2021-11-23 17:10:57,220 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [17546 Valid, 29325 Invalid, 671 Unknown, 0 Unchecked, 0.2s Time], IncrementalHoareTripleChecker [26 Valid, 465 Invalid, 0 Unknown, 180 Unchecked, 1.5s Time] [2021-11-23 17:10:57,223 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2199 states. [2021-11-23 17:10:57,299 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2199 to 2029. [2021-11-23 17:10:57,303 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2029 states, 2027 states have (on average 1.5505673408978786) internal successors, (3143), 2028 states have internal predecessors, (3143), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:10:57,309 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2029 states to 2029 states and 3143 transitions. [2021-11-23 17:10:57,309 INFO L78 Accepts]: Start accepts. Automaton has 2029 states and 3143 transitions. Word has length 83 [2021-11-23 17:10:57,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:10:57,310 INFO L470 AbstractCegarLoop]: Abstraction has 2029 states and 3143 transitions. [2021-11-23 17:10:57,311 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 65 states, 65 states have (on average 4.292307692307692) internal successors, (279), 65 states have internal predecessors, (279), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:10:57,311 INFO L276 IsEmpty]: Start isEmpty. Operand 2029 states and 3143 transitions. [2021-11-23 17:10:57,313 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-11-23 17:10:57,313 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:10:57,314 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:10:57,375 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Forceful destruction successful, exit code 0 [2021-11-23 17:10:57,547 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (36)] Forceful destruction successful, exit code 0 [2021-11-23 17:10:57,737 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (37)] Forceful destruction successful, exit code 0 [2021-11-23 17:10:57,934 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:10:57,935 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:10:57,935 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:10:57,935 INFO L85 PathProgramCache]: Analyzing trace with hash -852701794, now seen corresponding path program 1 times [2021-11-23 17:10:57,936 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:10:57,936 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [283474158] [2021-11-23 17:10:57,937 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:10:57,937 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:10:57,937 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:10:57,960 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:10:57,966 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (39)] Waiting until timeout for monitored process [2021-11-23 17:10:58,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:10:58,143 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:10:58,146 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:11:01,250 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:11:01,250 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:11:02,174 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:11:02,174 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:11:02,174 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [283474158] [2021-11-23 17:11:02,174 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [283474158] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:11:02,174 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [745674523] [2021-11-23 17:11:02,175 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:11:02,175 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:11:02,175 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:11:02,176 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:11:02,179 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (40)] Waiting until timeout for monitored process [2021-11-23 17:11:02,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:11:02,431 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-23 17:11:02,435 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:11:19,606 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:11:19,607 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:11:29,992 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:11:29,992 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [745674523] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:11:29,993 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1188062961] [2021-11-23 17:11:29,993 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:11:29,993 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:11:29,993 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:11:29,994 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:11:29,996 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2021-11-23 17:11:30,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:11:30,112 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-23 17:11:30,116 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:11:46,967 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:11:46,967 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:11:49,188 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:11:49,188 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1188062961] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:11:49,188 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:11:49,189 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 29, 24, 28, 24] total 83 [2021-11-23 17:11:49,189 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [86600364] [2021-11-23 17:11:49,189 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:11:49,191 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 83 states [2021-11-23 17:11:49,191 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:11:49,192 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2021-11-23 17:11:49,196 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=681, Invalid=6125, Unknown=0, NotChecked=0, Total=6806 [2021-11-23 17:11:49,197 INFO L87 Difference]: Start difference. First operand 2029 states and 3143 transitions. Second operand has 83 states, 83 states have (on average 4.0602409638554215) internal successors, (337), 83 states have internal predecessors, (337), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:11:59,529 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:11:59,529 INFO L93 Difference]: Finished difference Result 2378 states and 3582 transitions. [2021-11-23 17:11:59,530 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-11-23 17:11:59,530 INFO L78 Accepts]: Start accepts. Automaton has has 83 states, 83 states have (on average 4.0602409638554215) internal successors, (337), 83 states have internal predecessors, (337), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 83 [2021-11-23 17:11:59,530 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:11:59,534 INFO L225 Difference]: With dead ends: 2378 [2021-11-23 17:11:59,534 INFO L226 Difference]: Without dead ends: 2230 [2021-11-23 17:11:59,540 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 518 GetRequests, 419 SyntacticMatches, 1 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2987 ImplicationChecksByTransitivity, 35.8s TimeCoverageRelationStatistics Valid=1026, Invalid=8874, Unknown=0, NotChecked=0, Total=9900 [2021-11-23 17:11:59,541 INFO L933 BasicCegarLoop]: 1538 mSDtfsCounter, 20355 mSDsluCounter, 30897 mSDsCounter, 0 mSdLazyCounter, 523 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20355 SdHoareTripleChecker+Valid, 32435 SdHoareTripleChecker+Invalid, 758 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 523 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 212 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2021-11-23 17:11:59,541 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20355 Valid, 32435 Invalid, 758 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [23 Valid, 523 Invalid, 0 Unknown, 212 Unchecked, 1.7s Time] [2021-11-23 17:11:59,545 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2230 states. [2021-11-23 17:11:59,670 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2230 to 2030. [2021-11-23 17:11:59,672 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2030 states, 2028 states have (on average 1.5502958579881656) internal successors, (3144), 2029 states have internal predecessors, (3144), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:11:59,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2030 states to 2030 states and 3144 transitions. [2021-11-23 17:11:59,677 INFO L78 Accepts]: Start accepts. Automaton has 2030 states and 3144 transitions. Word has length 83 [2021-11-23 17:11:59,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:11:59,677 INFO L470 AbstractCegarLoop]: Abstraction has 2030 states and 3144 transitions. [2021-11-23 17:11:59,677 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 83 states, 83 states have (on average 4.0602409638554215) internal successors, (337), 83 states have internal predecessors, (337), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:11:59,678 INFO L276 IsEmpty]: Start isEmpty. Operand 2030 states and 3144 transitions. [2021-11-23 17:11:59,679 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-11-23 17:11:59,679 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:11:59,679 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:11:59,746 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Forceful destruction successful, exit code 0 [2021-11-23 17:11:59,908 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (40)] Forceful destruction successful, exit code 0 [2021-11-23 17:12:00,122 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (39)] Forceful destruction successful, exit code 0 [2021-11-23 17:12:00,306 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:12:00,307 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:12:00,307 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:12:00,307 INFO L85 PathProgramCache]: Analyzing trace with hash 861284219, now seen corresponding path program 1 times [2021-11-23 17:12:00,308 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:12:00,308 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1868468205] [2021-11-23 17:12:00,308 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:12:00,309 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:12:00,309 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:12:00,311 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:12:00,314 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (42)] Waiting until timeout for monitored process [2021-11-23 17:12:00,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:12:00,449 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 17:12:00,452 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:12:04,826 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:12:04,826 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:12:06,444 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:12:06,444 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:12:06,445 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1868468205] [2021-11-23 17:12:06,445 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1868468205] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:12:06,445 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [944127213] [2021-11-23 17:12:06,445 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:12:06,445 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:12:06,446 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:12:06,447 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:12:06,449 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (43)] Waiting until timeout for monitored process [2021-11-23 17:12:06,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:12:06,662 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-23 17:12:06,664 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:12:11,004 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:12:11,004 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:12:12,096 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:12:12,096 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [944127213] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:12:12,096 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [535238172] [2021-11-23 17:12:12,097 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:12:12,097 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:12:12,097 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:12:12,099 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:12:12,100 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2021-11-23 17:12:12,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:12:12,229 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-23 17:12:12,231 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:12:25,911 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:12:25,911 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:12:35,138 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:12:35,139 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [535238172] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:12:35,139 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:12:35,140 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 14, 16, 9, 24, 24] total 89 [2021-11-23 17:12:35,140 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [972811442] [2021-11-23 17:12:35,140 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:12:35,142 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 89 states [2021-11-23 17:12:35,142 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:12:35,143 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2021-11-23 17:12:35,147 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=628, Invalid=7204, Unknown=0, NotChecked=0, Total=7832 [2021-11-23 17:12:35,147 INFO L87 Difference]: Start difference. First operand 2030 states and 3144 transitions. Second operand has 89 states, 89 states have (on average 4.48314606741573) internal successors, (399), 89 states have internal predecessors, (399), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:12:45,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:12:45,348 INFO L93 Difference]: Finished difference Result 2377 states and 3578 transitions. [2021-11-23 17:12:45,349 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-23 17:12:45,349 INFO L78 Accepts]: Start accepts. Automaton has has 89 states, 89 states have (on average 4.48314606741573) internal successors, (399), 89 states have internal predecessors, (399), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 83 [2021-11-23 17:12:45,349 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:12:45,353 INFO L225 Difference]: With dead ends: 2377 [2021-11-23 17:12:45,353 INFO L226 Difference]: Without dead ends: 2217 [2021-11-23 17:12:45,358 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 523 GetRequests, 408 SyntacticMatches, 6 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 5175 ImplicationChecksByTransitivity, 25.9s TimeCoverageRelationStatistics Valid=1231, Invalid=10979, Unknown=0, NotChecked=0, Total=12210 [2021-11-23 17:12:45,359 INFO L933 BasicCegarLoop]: 1541 mSDtfsCounter, 29082 mSDsluCounter, 44125 mSDsCounter, 0 mSdLazyCounter, 650 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29082 SdHoareTripleChecker+Valid, 45666 SdHoareTripleChecker+Invalid, 1052 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.2s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 650 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 372 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:12:45,359 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [29082 Valid, 45666 Invalid, 1052 Unknown, 0 Unchecked, 0.2s Time], IncrementalHoareTripleChecker [30 Valid, 650 Invalid, 0 Unknown, 372 Unchecked, 2.0s Time] [2021-11-23 17:12:45,362 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2217 states. [2021-11-23 17:12:45,421 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2217 to 2008. [2021-11-23 17:12:45,426 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2008 states, 2006 states have (on average 1.5528414755732802) internal successors, (3115), 2007 states have internal predecessors, (3115), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:12:45,432 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2008 states to 2008 states and 3115 transitions. [2021-11-23 17:12:45,433 INFO L78 Accepts]: Start accepts. Automaton has 2008 states and 3115 transitions. Word has length 83 [2021-11-23 17:12:45,433 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:12:45,433 INFO L470 AbstractCegarLoop]: Abstraction has 2008 states and 3115 transitions. [2021-11-23 17:12:45,434 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 89 states, 89 states have (on average 4.48314606741573) internal successors, (399), 89 states have internal predecessors, (399), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:12:45,434 INFO L276 IsEmpty]: Start isEmpty. Operand 2008 states and 3115 transitions. [2021-11-23 17:12:45,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-11-23 17:12:45,436 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:12:45,437 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:12:45,454 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (43)] Ended with exit code 0 [2021-11-23 17:12:45,654 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (42)] Forceful destruction successful, exit code 0 [2021-11-23 17:12:45,873 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Forceful destruction successful, exit code 0 [2021-11-23 17:12:46,040 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:12:46,041 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:12:46,041 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:12:46,041 INFO L85 PathProgramCache]: Analyzing trace with hash 2053442141, now seen corresponding path program 1 times [2021-11-23 17:12:46,042 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:12:46,042 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [948854269] [2021-11-23 17:12:46,042 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:12:46,042 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:12:46,042 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:12:46,043 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:12:46,048 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (45)] Waiting until timeout for monitored process [2021-11-23 17:12:46,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:12:46,142 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-23 17:12:46,144 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:13:00,826 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:13:00,826 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:13:11,131 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:13:11,131 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:13:11,131 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [948854269] [2021-11-23 17:13:11,132 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [948854269] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:13:11,132 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [103035797] [2021-11-23 17:13:11,132 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:13:11,132 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:13:11,132 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:13:11,133 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:13:11,137 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (46)] Waiting until timeout for monitored process [2021-11-23 17:13:11,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:13:11,309 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-23 17:13:11,311 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:13:27,984 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:13:27,985 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:13:31,043 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:13:31,043 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [103035797] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:13:31,043 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [686178510] [2021-11-23 17:13:31,043 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:13:31,043 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:13:31,044 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:13:31,044 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:13:31,045 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2021-11-23 17:13:31,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:13:31,122 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 31 conjunts are in the unsatisfiable core [2021-11-23 17:13:31,124 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:13:35,797 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:13:35,798 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:13:37,189 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:13:37,190 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [686178510] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:13:37,190 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:13:37,190 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 22, 29, 24, 29, 24] total 68 [2021-11-23 17:13:37,190 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2008439499] [2021-11-23 17:13:37,190 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:13:37,191 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 68 states [2021-11-23 17:13:37,191 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:13:37,192 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2021-11-23 17:13:37,193 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=521, Invalid=4035, Unknown=0, NotChecked=0, Total=4556 [2021-11-23 17:13:37,193 INFO L87 Difference]: Start difference. First operand 2008 states and 3115 transitions. Second operand has 68 states, 68 states have (on average 3.1176470588235294) internal successors, (212), 68 states have internal predecessors, (212), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:13:38,978 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:13:38,978 INFO L93 Difference]: Finished difference Result 2166 states and 3324 transitions. [2021-11-23 17:13:38,979 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-11-23 17:13:38,979 INFO L78 Accepts]: Start accepts. Automaton has has 68 states, 68 states have (on average 3.1176470588235294) internal successors, (212), 68 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) Word has length 84 [2021-11-23 17:13:38,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:13:38,981 INFO L225 Difference]: With dead ends: 2166 [2021-11-23 17:13:38,981 INFO L226 Difference]: Without dead ends: 2032 [2021-11-23 17:13:38,982 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 501 GetRequests, 432 SyntacticMatches, 1 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1724 ImplicationChecksByTransitivity, 31.5s TimeCoverageRelationStatistics Valid=576, Invalid=4254, Unknown=0, NotChecked=0, Total=4830 [2021-11-23 17:13:38,983 INFO L933 BasicCegarLoop]: 1505 mSDtfsCounter, 13176 mSDsluCounter, 33022 mSDsCounter, 0 mSdLazyCounter, 366 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13176 SdHoareTripleChecker+Valid, 34527 SdHoareTripleChecker+Invalid, 611 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 366 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 229 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-23 17:13:38,983 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13176 Valid, 34527 Invalid, 611 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [16 Valid, 366 Invalid, 0 Unknown, 229 Unchecked, 0.7s Time] [2021-11-23 17:13:38,985 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2032 states. [2021-11-23 17:13:39,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2032 to 2014. [2021-11-23 17:13:39,022 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2014 states, 2012 states have (on average 1.55168986083499) internal successors, (3122), 2013 states have internal predecessors, (3122), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:13:39,025 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2014 states to 2014 states and 3122 transitions. [2021-11-23 17:13:39,025 INFO L78 Accepts]: Start accepts. Automaton has 2014 states and 3122 transitions. Word has length 84 [2021-11-23 17:13:39,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:13:39,025 INFO L470 AbstractCegarLoop]: Abstraction has 2014 states and 3122 transitions. [2021-11-23 17:13:39,025 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 68 states, 68 states have (on average 3.1176470588235294) internal successors, (212), 68 states have internal predecessors, (212), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:13:39,025 INFO L276 IsEmpty]: Start isEmpty. Operand 2014 states and 3122 transitions. [2021-11-23 17:13:39,026 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-11-23 17:13:39,026 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:13:39,026 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:13:39,038 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (46)] Forceful destruction successful, exit code 0 [2021-11-23 17:13:39,245 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (45)] Forceful destruction successful, exit code 0 [2021-11-23 17:13:39,464 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Forceful destruction successful, exit code 0 [2021-11-23 17:13:39,641 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:13:39,641 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:13:39,642 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:13:39,642 INFO L85 PathProgramCache]: Analyzing trace with hash -681934796, now seen corresponding path program 1 times [2021-11-23 17:13:39,642 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:13:39,642 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [423947503] [2021-11-23 17:13:39,642 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:13:39,642 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:13:39,643 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:13:39,646 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:13:39,684 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (48)] Waiting until timeout for monitored process [2021-11-23 17:13:39,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:13:39,732 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:13:39,733 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:13:40,106 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:13:40,106 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:13:40,395 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:13:40,396 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:13:40,396 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [423947503] [2021-11-23 17:13:40,396 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [423947503] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:13:40,396 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1697457973] [2021-11-23 17:13:40,396 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:13:40,396 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:13:40,396 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:13:40,397 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:13:40,398 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (49)] Waiting until timeout for monitored process [2021-11-23 17:13:40,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:13:40,526 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:13:40,527 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:13:40,914 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:13:40,914 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:13:41,214 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:13:41,215 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1697457973] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:13:41,215 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1347817284] [2021-11-23 17:13:41,215 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:13:41,215 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:13:41,215 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:13:41,230 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:13:41,231 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Waiting until timeout for monitored process [2021-11-23 17:13:41,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:13:41,297 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:13:41,298 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:13:41,685 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:13:41,685 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:13:41,989 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:13:41,989 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1347817284] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:13:41,990 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:13:41,990 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4, 4] total 6 [2021-11-23 17:13:41,990 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2069694317] [2021-11-23 17:13:41,990 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:13:41,991 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:13:41,991 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:13:41,991 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:13:41,992 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:13:41,992 INFO L87 Difference]: Start difference. First operand 2014 states and 3122 transitions. Second operand has 6 states, 6 states have (on average 26.833333333333332) internal successors, (161), 6 states have internal predecessors, (161), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:13:42,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:13:42,144 INFO L93 Difference]: Finished difference Result 3068 states and 4506 transitions. [2021-11-23 17:13:42,144 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:13:42,144 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 26.833333333333332) internal successors, (161), 6 states have internal predecessors, (161), 0 states have call successors, (0), 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 84 [2021-11-23 17:13:42,144 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:13:42,147 INFO L225 Difference]: With dead ends: 3068 [2021-11-23 17:13:42,147 INFO L226 Difference]: Without dead ends: 2670 [2021-11-23 17:13:42,149 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 499 GetRequests, 491 SyntacticMatches, 3 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=19, Invalid=23, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:13:42,150 INFO L933 BasicCegarLoop]: 1559 mSDtfsCounter, 3061 mSDsluCounter, 1743 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3061 SdHoareTripleChecker+Valid, 3302 SdHoareTripleChecker+Invalid, 47 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 17 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:13:42,150 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3061 Valid, 3302 Invalid, 47 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 22 Invalid, 0 Unknown, 17 Unchecked, 0.1s Time] [2021-11-23 17:13:42,153 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2670 states. [2021-11-23 17:13:42,228 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2670 to 2590. [2021-11-23 17:13:42,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2590 states, 2588 states have (on average 1.4938176197836166) internal successors, (3866), 2589 states have internal predecessors, (3866), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:13:42,233 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2590 states to 2590 states and 3866 transitions. [2021-11-23 17:13:42,233 INFO L78 Accepts]: Start accepts. Automaton has 2590 states and 3866 transitions. Word has length 84 [2021-11-23 17:13:42,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:13:42,234 INFO L470 AbstractCegarLoop]: Abstraction has 2590 states and 3866 transitions. [2021-11-23 17:13:42,234 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 26.833333333333332) internal successors, (161), 6 states have internal predecessors, (161), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:13:42,234 INFO L276 IsEmpty]: Start isEmpty. Operand 2590 states and 3866 transitions. [2021-11-23 17:13:42,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-11-23 17:13:42,235 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:13:42,235 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:13:42,243 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (48)] Forceful destruction successful, exit code 0 [2021-11-23 17:13:42,439 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (49)] Forceful destruction successful, exit code 0 [2021-11-23 17:13:42,665 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Forceful destruction successful, exit code 0 [2021-11-23 17:13:42,839 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:13:42,839 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:13:42,839 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:13:42,839 INFO L85 PathProgramCache]: Analyzing trace with hash 643511936, now seen corresponding path program 1 times [2021-11-23 17:13:42,840 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:13:42,840 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [427762958] [2021-11-23 17:13:42,840 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:13:42,840 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:13:42,840 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:13:42,841 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:13:42,842 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (51)] Waiting until timeout for monitored process [2021-11-23 17:13:42,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:13:42,920 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 17:13:42,928 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:13:46,568 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:13:46,568 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:13:48,097 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:13:48,097 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:13:48,098 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [427762958] [2021-11-23 17:13:48,098 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [427762958] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:13:48,098 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1068871141] [2021-11-23 17:13:48,098 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:13:48,098 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:13:48,099 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:13:48,104 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:13:48,105 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (52)] Waiting until timeout for monitored process [2021-11-23 17:13:48,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:13:48,246 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 17:13:48,247 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:13:51,817 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:13:51,818 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:13:52,980 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:13:52,980 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1068871141] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:13:52,980 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [973595379] [2021-11-23 17:13:52,981 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:13:52,981 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:13:52,981 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:13:52,982 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:13:52,983 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Waiting until timeout for monitored process [2021-11-23 17:13:53,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:13:53,055 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 27 conjunts are in the unsatisfiable core [2021-11-23 17:13:53,057 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:14:01,247 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:14:01,247 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:14:04,882 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:14:04,882 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [973595379] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:14:04,882 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:14:04,882 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 15, 15, 24, 22] total 79 [2021-11-23 17:14:04,882 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1903772414] [2021-11-23 17:14:04,883 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:14:04,883 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 79 states [2021-11-23 17:14:04,883 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:14:04,884 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2021-11-23 17:14:04,886 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=850, Invalid=5312, Unknown=0, NotChecked=0, Total=6162 [2021-11-23 17:14:04,886 INFO L87 Difference]: Start difference. First operand 2590 states and 3866 transitions. Second operand has 79 states, 79 states have (on average 4.1645569620253164) internal successors, (329), 79 states have internal predecessors, (329), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:14:06,372 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:14:06,372 INFO L93 Difference]: Finished difference Result 3350 states and 4831 transitions. [2021-11-23 17:14:06,372 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-23 17:14:06,373 INFO L78 Accepts]: Start accepts. Automaton has has 79 states, 79 states have (on average 4.1645569620253164) internal successors, (329), 79 states have internal predecessors, (329), 0 states have call successors, (0), 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 84 [2021-11-23 17:14:06,373 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:14:06,376 INFO L225 Difference]: With dead ends: 3350 [2021-11-23 17:14:06,376 INFO L226 Difference]: Without dead ends: 2976 [2021-11-23 17:14:06,377 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 502 GetRequests, 422 SyntacticMatches, 0 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2871 ImplicationChecksByTransitivity, 8.7s TimeCoverageRelationStatistics Valid=934, Invalid=5708, Unknown=0, NotChecked=0, Total=6642 [2021-11-23 17:14:06,378 INFO L933 BasicCegarLoop]: 1544 mSDtfsCounter, 13193 mSDsluCounter, 29679 mSDsCounter, 0 mSdLazyCounter, 328 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13193 SdHoareTripleChecker+Valid, 31223 SdHoareTripleChecker+Invalid, 562 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 328 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 218 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 17:14:06,378 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13193 Valid, 31223 Invalid, 562 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [16 Valid, 328 Invalid, 0 Unknown, 218 Unchecked, 0.6s Time] [2021-11-23 17:14:06,382 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2976 states. [2021-11-23 17:14:06,478 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2976 to 2595. [2021-11-23 17:14:06,480 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2595 states, 2593 states have (on average 1.4932510605476281) internal successors, (3872), 2594 states have internal predecessors, (3872), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:14:06,483 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2595 states to 2595 states and 3872 transitions. [2021-11-23 17:14:06,483 INFO L78 Accepts]: Start accepts. Automaton has 2595 states and 3872 transitions. Word has length 84 [2021-11-23 17:14:06,483 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:14:06,483 INFO L470 AbstractCegarLoop]: Abstraction has 2595 states and 3872 transitions. [2021-11-23 17:14:06,483 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 79 states, 79 states have (on average 4.1645569620253164) internal successors, (329), 79 states have internal predecessors, (329), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:14:06,484 INFO L276 IsEmpty]: Start isEmpty. Operand 2595 states and 3872 transitions. [2021-11-23 17:14:06,484 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-11-23 17:14:06,484 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:14:06,484 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:14:06,514 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Forceful destruction successful, exit code 0 [2021-11-23 17:14:06,709 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (51)] Ended with exit code 0 [2021-11-23 17:14:06,903 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (52)] Forceful destruction successful, exit code 0 [2021-11-23 17:14:07,098 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:14:07,098 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:14:07,098 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:14:07,099 INFO L85 PathProgramCache]: Analyzing trace with hash -1099299449, now seen corresponding path program 1 times [2021-11-23 17:14:07,099 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:14:07,099 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1147897741] [2021-11-23 17:14:07,099 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:14:07,099 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:14:07,099 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:14:07,100 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:14:07,101 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (54)] Waiting until timeout for monitored process [2021-11-23 17:14:07,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:14:07,185 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 17:14:07,186 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:14:10,741 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:14:10,741 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:14:12,097 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:14:12,097 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:14:12,097 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1147897741] [2021-11-23 17:14:12,098 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1147897741] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:14:12,098 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1097971085] [2021-11-23 17:14:12,098 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:14:12,098 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:14:12,098 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:14:12,099 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:14:12,100 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (55)] Waiting until timeout for monitored process [2021-11-23 17:14:12,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:14:12,246 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 35 conjunts are in the unsatisfiable core [2021-11-23 17:14:12,248 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:14:22,573 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:14:22,574 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:14:28,083 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:14:28,084 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1097971085] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:14:28,084 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1557629169] [2021-11-23 17:14:28,084 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:14:28,085 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:14:28,085 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:14:28,087 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:14:28,088 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Waiting until timeout for monitored process [2021-11-23 17:14:28,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:14:28,178 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-23 17:14:28,179 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:14:33,332 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:14:33,332 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:14:36,759 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:14:36,759 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1557629169] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:14:36,760 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:14:36,760 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 30, 26, 17, 16] total 96 [2021-11-23 17:14:36,760 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1083250729] [2021-11-23 17:14:36,761 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:14:36,761 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 96 states [2021-11-23 17:14:36,762 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:14:36,762 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 96 interpolants. [2021-11-23 17:14:36,763 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1289, Invalid=7831, Unknown=0, NotChecked=0, Total=9120 [2021-11-23 17:14:36,763 INFO L87 Difference]: Start difference. First operand 2595 states and 3872 transitions. Second operand has 96 states, 96 states have (on average 3.84375) internal successors, (369), 96 states have internal predecessors, (369), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:14:39,829 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:14:39,829 INFO L93 Difference]: Finished difference Result 3560 states and 5081 transitions. [2021-11-23 17:14:39,830 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-11-23 17:14:39,830 INFO L78 Accepts]: Start accepts. Automaton has has 96 states, 96 states have (on average 3.84375) internal successors, (369), 96 states have internal predecessors, (369), 0 states have call successors, (0), 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 84 [2021-11-23 17:14:39,830 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:14:39,833 INFO L225 Difference]: With dead ends: 3560 [2021-11-23 17:14:39,833 INFO L226 Difference]: Without dead ends: 3032 [2021-11-23 17:14:39,835 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 504 GetRequests, 406 SyntacticMatches, 0 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4055 ImplicationChecksByTransitivity, 16.5s TimeCoverageRelationStatistics Valid=1463, Invalid=8437, Unknown=0, NotChecked=0, Total=9900 [2021-11-23 17:14:39,836 INFO L933 BasicCegarLoop]: 1549 mSDtfsCounter, 13323 mSDsluCounter, 26654 mSDsCounter, 0 mSdLazyCounter, 731 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13323 SdHoareTripleChecker+Valid, 28203 SdHoareTripleChecker+Invalid, 1257 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 731 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 501 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2021-11-23 17:14:39,836 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13323 Valid, 28203 Invalid, 1257 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [25 Valid, 731 Invalid, 0 Unknown, 501 Unchecked, 1.4s Time] [2021-11-23 17:14:39,840 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3032 states. [2021-11-23 17:14:39,926 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3032 to 2595. [2021-11-23 17:14:39,928 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2595 states, 2593 states have (on average 1.4932510605476281) internal successors, (3872), 2594 states have internal predecessors, (3872), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:14:39,932 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2595 states to 2595 states and 3872 transitions. [2021-11-23 17:14:39,932 INFO L78 Accepts]: Start accepts. Automaton has 2595 states and 3872 transitions. Word has length 84 [2021-11-23 17:14:39,932 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:14:39,932 INFO L470 AbstractCegarLoop]: Abstraction has 2595 states and 3872 transitions. [2021-11-23 17:14:39,932 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 96 states, 96 states have (on average 3.84375) internal successors, (369), 96 states have internal predecessors, (369), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:14:39,933 INFO L276 IsEmpty]: Start isEmpty. Operand 2595 states and 3872 transitions. [2021-11-23 17:14:39,933 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-11-23 17:14:39,933 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:14:39,934 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:14:39,936 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (55)] Forceful destruction successful, exit code 0 [2021-11-23 17:14:40,160 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Forceful destruction successful, exit code 0 [2021-11-23 17:14:40,344 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (54)] Forceful destruction successful, exit code 0 [2021-11-23 17:14:40,534 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:14:40,535 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:14:40,535 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:14:40,535 INFO L85 PathProgramCache]: Analyzing trace with hash -169003638, now seen corresponding path program 1 times [2021-11-23 17:14:40,536 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:14:40,536 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1474559856] [2021-11-23 17:14:40,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:14:40,536 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:14:40,536 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:14:40,537 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:14:40,540 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (57)] Waiting until timeout for monitored process [2021-11-23 17:14:40,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:14:40,635 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:14:40,637 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:14:43,004 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:14:43,004 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:14:43,590 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:14:43,591 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:14:43,591 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1474559856] [2021-11-23 17:14:43,591 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1474559856] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:14:43,591 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [931500967] [2021-11-23 17:14:43,591 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:14:43,591 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:14:43,592 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:14:43,592 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:14:43,594 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (58)] Waiting until timeout for monitored process [2021-11-23 17:14:43,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:14:43,753 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:14:43,754 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:14:46,209 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:14:46,209 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:14:47,015 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:14:47,016 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [931500967] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:14:47,016 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [870608295] [2021-11-23 17:14:47,016 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:14:47,017 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:14:47,017 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:14:47,022 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:14:47,023 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Waiting until timeout for monitored process [2021-11-23 17:14:47,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:14:47,108 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 17:14:47,109 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:14:49,684 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:14:49,685 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:14:51,212 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:14:51,213 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [870608295] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:14:51,213 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:14:51,213 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 11, 9, 12, 10] total 45 [2021-11-23 17:14:51,213 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1660536504] [2021-11-23 17:14:51,213 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:14:51,214 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2021-11-23 17:14:51,214 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:14:51,215 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-11-23 17:14:51,215 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=162, Invalid=1818, Unknown=0, NotChecked=0, Total=1980 [2021-11-23 17:14:51,215 INFO L87 Difference]: Start difference. First operand 2595 states and 3872 transitions. Second operand has 45 states, 45 states have (on average 8.666666666666666) internal successors, (390), 45 states have internal predecessors, (390), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:14:52,824 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:14:52,824 INFO L93 Difference]: Finished difference Result 3206 states and 4646 transitions. [2021-11-23 17:14:52,825 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-23 17:14:52,825 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 8.666666666666666) internal successors, (390), 45 states have internal predecessors, (390), 0 states have call successors, (0), 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 84 [2021-11-23 17:14:52,825 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:14:52,828 INFO L225 Difference]: With dead ends: 3206 [2021-11-23 17:14:52,829 INFO L226 Difference]: Without dead ends: 2820 [2021-11-23 17:14:52,830 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 518 GetRequests, 461 SyntacticMatches, 1 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 744 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=326, Invalid=2980, Unknown=0, NotChecked=0, Total=3306 [2021-11-23 17:14:52,831 INFO L933 BasicCegarLoop]: 1545 mSDtfsCounter, 7354 mSDsluCounter, 29194 mSDsCounter, 0 mSdLazyCounter, 125 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7354 SdHoareTripleChecker+Valid, 30739 SdHoareTripleChecker+Invalid, 339 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 125 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 207 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:14:52,831 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7354 Valid, 30739 Invalid, 339 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 125 Invalid, 0 Unknown, 207 Unchecked, 0.2s Time] [2021-11-23 17:14:52,835 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2820 states. [2021-11-23 17:14:52,953 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2820 to 2528. [2021-11-23 17:14:52,956 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2528 states, 2526 states have (on average 1.4980205859065716) internal successors, (3784), 2527 states have internal predecessors, (3784), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:14:52,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2528 states to 2528 states and 3784 transitions. [2021-11-23 17:14:52,959 INFO L78 Accepts]: Start accepts. Automaton has 2528 states and 3784 transitions. Word has length 84 [2021-11-23 17:14:52,959 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:14:52,960 INFO L470 AbstractCegarLoop]: Abstraction has 2528 states and 3784 transitions. [2021-11-23 17:14:52,960 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 8.666666666666666) internal successors, (390), 45 states have internal predecessors, (390), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:14:52,960 INFO L276 IsEmpty]: Start isEmpty. Operand 2528 states and 3784 transitions. [2021-11-23 17:14:52,961 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-11-23 17:14:52,961 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:14:52,961 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:14:52,988 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (57)] Forceful destruction successful, exit code 0 [2021-11-23 17:14:53,193 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (58)] Forceful destruction successful, exit code 0 [2021-11-23 17:14:53,414 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Forceful destruction successful, exit code 0 [2021-11-23 17:14:53,588 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,58 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,59 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:14:53,589 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:14:53,589 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:14:53,589 INFO L85 PathProgramCache]: Analyzing trace with hash -1655139731, now seen corresponding path program 1 times [2021-11-23 17:14:53,590 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:14:53,590 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1447128504] [2021-11-23 17:14:53,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:14:53,590 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:14:53,590 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:14:53,591 INFO L229 MonitoredProcess]: Starting monitored process 60 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:14:53,620 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (60)] Waiting until timeout for monitored process [2021-11-23 17:14:53,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:14:53,734 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:14:53,735 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:14:54,207 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 11 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:14:54,207 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:14:54,527 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 11 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:14:54,527 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:14:54,527 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1447128504] [2021-11-23 17:14:54,527 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1447128504] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:14:54,527 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [406887149] [2021-11-23 17:14:54,528 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:14:54,528 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:14:54,528 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:14:54,529 INFO L229 MonitoredProcess]: Starting monitored process 61 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:14:54,530 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (61)] Waiting until timeout for monitored process [2021-11-23 17:14:54,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:14:54,642 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:14:54,643 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:14:54,812 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 17:14:54,813 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:14:54,813 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [406887149] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:14:54,813 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:14:54,814 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4, 4] total 6 [2021-11-23 17:14:54,814 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [639556232] [2021-11-23 17:14:54,814 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:14:54,814 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:14:54,815 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:14:54,815 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:14:54,815 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:14:54,816 INFO L87 Difference]: Start difference. First operand 2528 states and 3784 transitions. Second operand has 3 states, 3 states have (on average 26.333333333333332) internal successors, (79), 3 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:14:54,912 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:14:54,912 INFO L93 Difference]: Finished difference Result 3322 states and 4822 transitions. [2021-11-23 17:14:54,913 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:14:54,913 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 26.333333333333332) internal successors, (79), 3 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 85 [2021-11-23 17:14:54,913 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:14:54,916 INFO L225 Difference]: With dead ends: 3322 [2021-11-23 17:14:54,916 INFO L226 Difference]: Without dead ends: 2551 [2021-11-23 17:14:54,918 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 252 GetRequests, 247 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:14:54,918 INFO L933 BasicCegarLoop]: 1535 mSDtfsCounter, 1496 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 7 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1496 SdHoareTripleChecker+Valid, 1597 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 7 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:14:54,918 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1496 Valid, 1597 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 7 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:14:54,921 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2551 states. [2021-11-23 17:14:54,996 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2551 to 2439. [2021-11-23 17:14:54,998 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2439 states, 2437 states have (on average 1.5038982355354944) internal successors, (3665), 2438 states have internal predecessors, (3665), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:14:55,001 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2439 states to 2439 states and 3665 transitions. [2021-11-23 17:14:55,002 INFO L78 Accepts]: Start accepts. Automaton has 2439 states and 3665 transitions. Word has length 85 [2021-11-23 17:14:55,002 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:14:55,002 INFO L470 AbstractCegarLoop]: Abstraction has 2439 states and 3665 transitions. [2021-11-23 17:14:55,002 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 26.333333333333332) internal successors, (79), 3 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:14:55,002 INFO L276 IsEmpty]: Start isEmpty. Operand 2439 states and 3665 transitions. [2021-11-23 17:14:55,003 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-11-23 17:14:55,003 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:14:55,003 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:14:55,005 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (61)] Forceful destruction successful, exit code 0 [2021-11-23 17:14:55,214 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (60)] Forceful destruction successful, exit code 0 [2021-11-23 17:14:55,404 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 61 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,60 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:14:55,404 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:14:55,404 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:14:55,405 INFO L85 PathProgramCache]: Analyzing trace with hash -2139020399, now seen corresponding path program 1 times [2021-11-23 17:14:55,405 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:14:55,405 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1393321156] [2021-11-23 17:14:55,405 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:14:55,405 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:14:55,405 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:14:55,406 INFO L229 MonitoredProcess]: Starting monitored process 62 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:14:55,407 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (62)] Waiting until timeout for monitored process [2021-11-23 17:14:55,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:14:55,494 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:14:55,495 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:14:57,517 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:14:57,517 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:14:58,075 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:14:58,075 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:14:58,076 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1393321156] [2021-11-23 17:14:58,076 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1393321156] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:14:58,076 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [550603286] [2021-11-23 17:14:58,076 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:14:58,076 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:14:58,076 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:14:58,077 INFO L229 MonitoredProcess]: Starting monitored process 63 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:14:58,079 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (63)] Waiting until timeout for monitored process [2021-11-23 17:14:58,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:14:58,243 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:14:58,244 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:15:00,185 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:15:00,185 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:15:00,532 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:15:00,532 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [550603286] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:15:00,532 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1623173915] [2021-11-23 17:15:00,532 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:15:00,532 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:15:00,533 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:15:00,533 INFO L229 MonitoredProcess]: Starting monitored process 64 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:15:00,535 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Waiting until timeout for monitored process [2021-11-23 17:15:00,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:15:00,625 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:15:00,626 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:15:02,512 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:15:02,512 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:15:02,855 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:15:02,856 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1623173915] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:15:02,856 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:15:02,856 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 11, 9, 10, 9] total 18 [2021-11-23 17:15:02,856 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2115783766] [2021-11-23 17:15:02,856 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:15:02,857 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-23 17:15:02,857 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:15:02,858 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-23 17:15:02,858 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2021-11-23 17:15:02,859 INFO L87 Difference]: Start difference. First operand 2439 states and 3665 transitions. Second operand has 18 states, 18 states have (on average 8.38888888888889) internal successors, (151), 18 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:03,113 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:15:03,113 INFO L93 Difference]: Finished difference Result 2650 states and 3945 transitions. [2021-11-23 17:15:03,114 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 17:15:03,114 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 8.38888888888889) internal successors, (151), 18 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 85 [2021-11-23 17:15:03,114 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:15:03,117 INFO L225 Difference]: With dead ends: 2650 [2021-11-23 17:15:03,117 INFO L226 Difference]: Without dead ends: 2337 [2021-11-23 17:15:03,118 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 505 GetRequests, 488 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=58, Invalid=284, Unknown=0, NotChecked=0, Total=342 [2021-11-23 17:15:03,119 INFO L933 BasicCegarLoop]: 1526 mSDtfsCounter, 1535 mSDsluCounter, 16740 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1535 SdHoareTripleChecker+Valid, 18266 SdHoareTripleChecker+Invalid, 144 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 84 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:15:03,119 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1535 Valid, 18266 Invalid, 144 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 58 Invalid, 0 Unknown, 84 Unchecked, 0.1s Time] [2021-11-23 17:15:03,123 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2337 states. [2021-11-23 17:15:03,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2337 to 2326. [2021-11-23 17:15:03,271 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2326 states, 2324 states have (on average 1.5133390705679863) internal successors, (3517), 2325 states have internal predecessors, (3517), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:03,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2326 states to 2326 states and 3517 transitions. [2021-11-23 17:15:03,276 INFO L78 Accepts]: Start accepts. Automaton has 2326 states and 3517 transitions. Word has length 85 [2021-11-23 17:15:03,277 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:15:03,277 INFO L470 AbstractCegarLoop]: Abstraction has 2326 states and 3517 transitions. [2021-11-23 17:15:03,277 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 8.38888888888889) internal successors, (151), 18 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:03,277 INFO L276 IsEmpty]: Start isEmpty. Operand 2326 states and 3517 transitions. [2021-11-23 17:15:03,278 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-11-23 17:15:03,278 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:15:03,279 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:15:03,282 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (63)] Forceful destruction successful, exit code 0 [2021-11-23 17:15:03,511 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Forceful destruction successful, exit code 0 [2021-11-23 17:15:03,692 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (62)] Ended with exit code 0 [2021-11-23 17:15:03,881 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 63 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,64 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,62 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:15:03,882 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:15:03,882 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:15:03,882 INFO L85 PathProgramCache]: Analyzing trace with hash 527848583, now seen corresponding path program 1 times [2021-11-23 17:15:03,883 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:15:03,883 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1016886750] [2021-11-23 17:15:03,883 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:15:03,883 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:15:03,883 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:15:03,885 INFO L229 MonitoredProcess]: Starting monitored process 65 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:15:03,887 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (65)] Waiting until timeout for monitored process [2021-11-23 17:15:03,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:15:03,978 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:15:03,980 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:15:06,031 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 9 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:15:06,031 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:15:06,612 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 9 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:15:06,612 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:15:06,612 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1016886750] [2021-11-23 17:15:06,612 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1016886750] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:15:06,613 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1318056093] [2021-11-23 17:15:06,613 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:15:06,613 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:15:06,613 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:15:06,615 INFO L229 MonitoredProcess]: Starting monitored process 66 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:15:06,616 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (66)] Waiting until timeout for monitored process [2021-11-23 17:15:06,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:15:06,778 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:15:06,779 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:15:08,699 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 9 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:15:08,699 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:15:09,064 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 9 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:15:09,065 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1318056093] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:15:09,065 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2014617437] [2021-11-23 17:15:09,065 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:15:09,066 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:15:09,066 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:15:09,067 INFO L229 MonitoredProcess]: Starting monitored process 67 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:15:09,068 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (67)] Waiting until timeout for monitored process [2021-11-23 17:15:09,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:15:09,174 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-23 17:15:09,176 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:15:12,448 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 9 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:15:12,448 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:15:16,599 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:15:16,599 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2014617437] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:15:16,599 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:15:16,599 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 11, 9, 14, 15] total 40 [2021-11-23 17:15:16,599 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1698825188] [2021-11-23 17:15:16,600 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:15:16,600 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2021-11-23 17:15:16,600 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:15:16,601 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-11-23 17:15:16,602 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=181, Invalid=1378, Unknown=1, NotChecked=0, Total=1560 [2021-11-23 17:15:16,602 INFO L87 Difference]: Start difference. First operand 2326 states and 3517 transitions. Second operand has 40 states, 40 states have (on average 6.925) internal successors, (277), 40 states have internal predecessors, (277), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:17,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:15:17,608 INFO L93 Difference]: Finished difference Result 2561 states and 3821 transitions. [2021-11-23 17:15:17,608 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-23 17:15:17,608 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 6.925) internal successors, (277), 40 states have internal predecessors, (277), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 86 [2021-11-23 17:15:17,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:15:17,611 INFO L225 Difference]: With dead ends: 2561 [2021-11-23 17:15:17,611 INFO L226 Difference]: Without dead ends: 2288 [2021-11-23 17:15:17,612 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 514 GetRequests, 473 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 522 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=223, Invalid=1582, Unknown=1, NotChecked=0, Total=1806 [2021-11-23 17:15:17,613 INFO L933 BasicCegarLoop]: 1520 mSDtfsCounter, 5837 mSDsluCounter, 17221 mSDsCounter, 0 mSdLazyCounter, 162 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5837 SdHoareTripleChecker+Valid, 18741 SdHoareTripleChecker+Invalid, 258 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 162 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 90 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 17:15:17,614 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5837 Valid, 18741 Invalid, 258 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 162 Invalid, 0 Unknown, 90 Unchecked, 0.3s Time] [2021-11-23 17:15:17,616 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2288 states. [2021-11-23 17:15:17,679 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2288 to 2252. [2021-11-23 17:15:17,681 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2252 states, 2250 states have (on average 1.5204444444444445) internal successors, (3421), 2251 states have internal predecessors, (3421), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:17,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2252 states to 2252 states and 3421 transitions. [2021-11-23 17:15:17,685 INFO L78 Accepts]: Start accepts. Automaton has 2252 states and 3421 transitions. Word has length 86 [2021-11-23 17:15:17,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:15:17,685 INFO L470 AbstractCegarLoop]: Abstraction has 2252 states and 3421 transitions. [2021-11-23 17:15:17,686 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 6.925) internal successors, (277), 40 states have internal predecessors, (277), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:17,686 INFO L276 IsEmpty]: Start isEmpty. Operand 2252 states and 3421 transitions. [2021-11-23 17:15:17,687 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2021-11-23 17:15:17,687 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:15:17,688 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:15:17,718 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (67)] Forceful destruction successful, exit code 0 [2021-11-23 17:15:17,908 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (65)] Forceful destruction successful, exit code 0 [2021-11-23 17:15:18,100 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (66)] Forceful destruction successful, exit code 0 [2021-11-23 17:15:18,298 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 67 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,65 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,66 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:15:18,298 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:15:18,299 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:15:18,299 INFO L85 PathProgramCache]: Analyzing trace with hash -94162371, now seen corresponding path program 1 times [2021-11-23 17:15:18,299 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:15:18,300 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [200092119] [2021-11-23 17:15:18,300 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:15:18,300 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:15:18,300 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:15:18,301 INFO L229 MonitoredProcess]: Starting monitored process 68 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:15:18,304 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (68)] Waiting until timeout for monitored process [2021-11-23 17:15:18,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:15:18,381 INFO L263 TraceCheckSpWp]: Trace formula consists of 208 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 17:15:18,382 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:15:19,755 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 59 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:15:19,755 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:15:19,756 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:15:19,756 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [200092119] [2021-11-23 17:15:19,756 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [200092119] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:15:19,756 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:15:19,756 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:15:19,756 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [601678628] [2021-11-23 17:15:19,756 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:15:19,757 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 17:15:19,757 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:15:19,757 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 17:15:19,758 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 17:15:19,758 INFO L87 Difference]: Start difference. First operand 2252 states and 3421 transitions. Second operand has 4 states, 4 states have (on average 33.5) internal successors, (134), 3 states have internal predecessors, (134), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:58,542 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:15:58,543 INFO L93 Difference]: Finished difference Result 4543 states and 6948 transitions. [2021-11-23 17:15:58,543 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 17:15:58,544 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 33.5) internal successors, (134), 3 states have internal predecessors, (134), 0 states have call successors, (0), 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 134 [2021-11-23 17:15:58,544 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:15:58,546 INFO L225 Difference]: With dead ends: 4543 [2021-11-23 17:15:58,546 INFO L226 Difference]: Without dead ends: 3003 [2021-11-23 17:15:58,548 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 131 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 17:15:58,548 INFO L933 BasicCegarLoop]: 735 mSDtfsCounter, 784 mSDsluCounter, 116 mSDsCounter, 0 mSdLazyCounter, 3696 mSolverCounterSat, 223 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 32.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 784 SdHoareTripleChecker+Valid, 851 SdHoareTripleChecker+Invalid, 3919 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 223 IncrementalHoareTripleChecker+Valid, 3696 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 38.6s IncrementalHoareTripleChecker+Time [2021-11-23 17:15:58,550 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [784 Valid, 851 Invalid, 3919 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [223 Valid, 3696 Invalid, 0 Unknown, 0 Unchecked, 38.6s Time] [2021-11-23 17:15:58,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3003 states. [2021-11-23 17:15:58,629 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3003 to 3003. [2021-11-23 17:15:58,632 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3003 states, 3001 states have (on average 1.4075308230589803) internal successors, (4224), 3002 states have internal predecessors, (4224), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:58,635 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3003 states to 3003 states and 4224 transitions. [2021-11-23 17:15:58,636 INFO L78 Accepts]: Start accepts. Automaton has 3003 states and 4224 transitions. Word has length 134 [2021-11-23 17:15:58,636 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:15:58,636 INFO L470 AbstractCegarLoop]: Abstraction has 3003 states and 4224 transitions. [2021-11-23 17:15:58,636 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 33.5) internal successors, (134), 3 states have internal predecessors, (134), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:58,636 INFO L276 IsEmpty]: Start isEmpty. Operand 3003 states and 4224 transitions. [2021-11-23 17:15:58,637 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2021-11-23 17:15:58,638 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:15:58,638 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:15:58,648 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (68)] Forceful destruction successful, exit code 0 [2021-11-23 17:15:58,842 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 68 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:15:58,842 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:15:58,842 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:15:58,843 INFO L85 PathProgramCache]: Analyzing trace with hash -526226132, now seen corresponding path program 1 times [2021-11-23 17:15:58,843 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:15:58,844 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [658263208] [2021-11-23 17:15:58,844 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:15:58,844 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:15:58,844 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:15:58,845 INFO L229 MonitoredProcess]: Starting monitored process 69 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:15:58,846 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (69)] Waiting until timeout for monitored process [2021-11-23 17:15:58,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:15:58,996 INFO L263 TraceCheckSpWp]: Trace formula consists of 289 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:15:58,998 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:16:01,678 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 70 proven. 34 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:16:01,679 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:16:02,703 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 70 proven. 34 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:16:02,704 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:16:02,704 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [658263208] [2021-11-23 17:16:02,704 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [658263208] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:16:02,704 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1778092869] [2021-11-23 17:16:02,704 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:16:02,705 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:16:02,705 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:16:02,706 INFO L229 MonitoredProcess]: Starting monitored process 70 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:16:02,707 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (70)] Waiting until timeout for monitored process [2021-11-23 17:16:02,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:16:02,943 INFO L263 TraceCheckSpWp]: Trace formula consists of 289 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:16:02,945 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:16:07,051 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 39 proven. 74 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:16:07,052 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:16:08,572 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 39 proven. 74 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:16:08,572 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1778092869] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:16:08,573 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [390588913] [2021-11-23 17:16:08,573 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:16:08,573 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:16:08,573 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:16:08,574 INFO L229 MonitoredProcess]: Starting monitored process 71 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:16:08,575 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (71)] Waiting until timeout for monitored process [2021-11-23 17:16:08,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:16:08,698 INFO L263 TraceCheckSpWp]: Trace formula consists of 289 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:16:08,700 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:16:11,966 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 39 proven. 72 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:16:11,966 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:16:13,044 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 39 proven. 72 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:16:13,045 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [390588913] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:16:13,045 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:16:13,045 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 13, 13, 8, 8] total 49 [2021-11-23 17:16:13,045 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2084701844] [2021-11-23 17:16:13,046 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:16:13,047 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2021-11-23 17:16:13,047 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:16:13,047 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-11-23 17:16:13,048 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=208, Invalid=2242, Unknown=0, NotChecked=0, Total=2450 [2021-11-23 17:16:13,048 INFO L87 Difference]: Start difference. First operand 3003 states and 4224 transitions. Second operand has 50 states, 50 states have (on average 12.18) internal successors, (609), 49 states have internal predecessors, (609), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:16:16,040 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:16:16,040 INFO L93 Difference]: Finished difference Result 3690 states and 5118 transitions. [2021-11-23 17:16:16,041 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-23 17:16:16,041 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 12.18) internal successors, (609), 49 states have internal predecessors, (609), 0 states have call successors, (0), 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 135 [2021-11-23 17:16:16,041 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:16:16,045 INFO L225 Difference]: With dead ends: 3690 [2021-11-23 17:16:16,045 INFO L226 Difference]: Without dead ends: 3041 [2021-11-23 17:16:16,047 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 833 GetRequests, 764 SyntacticMatches, 1 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1161 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=449, Invalid=4381, Unknown=0, NotChecked=0, Total=4830 [2021-11-23 17:16:16,048 INFO L933 BasicCegarLoop]: 1517 mSDtfsCounter, 11651 mSDsluCounter, 46559 mSDsCounter, 0 mSdLazyCounter, 134 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11651 SdHoareTripleChecker+Valid, 48076 SdHoareTripleChecker+Invalid, 267 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 134 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 125 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:16:16,048 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11651 Valid, 48076 Invalid, 267 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [8 Valid, 134 Invalid, 0 Unknown, 125 Unchecked, 0.2s Time] [2021-11-23 17:16:16,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3041 states. [2021-11-23 17:16:16,172 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3041 to 3041. [2021-11-23 17:16:16,174 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3041 states, 3039 states have (on average 1.404080289568937) internal successors, (4267), 3040 states have internal predecessors, (4267), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:16:16,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3041 states to 3041 states and 4267 transitions. [2021-11-23 17:16:16,179 INFO L78 Accepts]: Start accepts. Automaton has 3041 states and 4267 transitions. Word has length 135 [2021-11-23 17:16:16,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:16:16,179 INFO L470 AbstractCegarLoop]: Abstraction has 3041 states and 4267 transitions. [2021-11-23 17:16:16,180 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 12.18) internal successors, (609), 49 states have internal predecessors, (609), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:16:16,180 INFO L276 IsEmpty]: Start isEmpty. Operand 3041 states and 4267 transitions. [2021-11-23 17:16:16,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2021-11-23 17:16:16,182 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:16:16,182 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:16:16,188 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (70)] Forceful destruction successful, exit code 0 [2021-11-23 17:16:16,396 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (69)] Forceful destruction successful, exit code 0 [2021-11-23 17:16:16,611 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (71)] Forceful destruction successful, exit code 0 [2021-11-23 17:16:16,785 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 70 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,69 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,71 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:16:16,785 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:16:16,785 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:16:16,786 INFO L85 PathProgramCache]: Analyzing trace with hash -949872854, now seen corresponding path program 1 times [2021-11-23 17:16:16,786 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:16:16,786 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1280314153] [2021-11-23 17:16:16,786 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:16:16,787 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:16:16,787 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:16:16,787 INFO L229 MonitoredProcess]: Starting monitored process 72 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:16:16,789 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (72)] Waiting until timeout for monitored process [2021-11-23 17:16:16,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:16:16,914 INFO L263 TraceCheckSpWp]: Trace formula consists of 290 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:16:16,916 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:16:19,622 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 66 proven. 40 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 17:16:19,622 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:16:20,739 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 66 proven. 40 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 17:16:20,739 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:16:20,740 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1280314153] [2021-11-23 17:16:20,740 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1280314153] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:16:20,740 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [15259620] [2021-11-23 17:16:20,740 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:16:20,740 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:16:20,740 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:16:20,745 INFO L229 MonitoredProcess]: Starting monitored process 73 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:16:20,747 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (73)] Waiting until timeout for monitored process [2021-11-23 17:16:20,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:16:20,945 INFO L263 TraceCheckSpWp]: Trace formula consists of 290 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:16:20,947 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:16:25,392 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 39 proven. 74 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:16:25,393 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:16:26,861 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 39 proven. 74 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:16:26,861 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [15259620] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:16:26,861 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [470870547] [2021-11-23 17:16:26,861 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:16:26,862 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:16:26,862 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:16:26,862 INFO L229 MonitoredProcess]: Starting monitored process 74 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:16:26,863 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (74)] Waiting until timeout for monitored process [2021-11-23 17:16:26,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:16:26,964 INFO L263 TraceCheckSpWp]: Trace formula consists of 290 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:16:26,966 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:16:30,189 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 39 proven. 72 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:16:30,189 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:16:31,308 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 39 proven. 72 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:16:31,308 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [470870547] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:16:31,308 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:16:31,309 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 13, 13, 8, 8] total 47 [2021-11-23 17:16:31,309 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [998330443] [2021-11-23 17:16:31,309 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:16:31,310 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-23 17:16:31,310 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:16:31,311 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-23 17:16:31,311 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=2056, Unknown=0, NotChecked=0, Total=2256 [2021-11-23 17:16:31,311 INFO L87 Difference]: Start difference. First operand 3041 states and 4267 transitions. Second operand has 48 states, 48 states have (on average 12.625) internal successors, (606), 47 states have internal predecessors, (606), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:16:34,175 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:16:34,175 INFO L93 Difference]: Finished difference Result 3985 states and 5472 transitions. [2021-11-23 17:16:34,176 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-23 17:16:34,176 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 12.625) internal successors, (606), 47 states have internal predecessors, (606), 0 states have call successors, (0), 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 135 [2021-11-23 17:16:34,176 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:16:34,180 INFO L225 Difference]: With dead ends: 3985 [2021-11-23 17:16:34,180 INFO L226 Difference]: Without dead ends: 3340 [2021-11-23 17:16:34,183 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 832 GetRequests, 763 SyntacticMatches, 3 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1127 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=453, Invalid=4103, Unknown=0, NotChecked=0, Total=4556 [2021-11-23 17:16:34,183 INFO L933 BasicCegarLoop]: 1537 mSDtfsCounter, 10290 mSDsluCounter, 43233 mSDsCounter, 0 mSdLazyCounter, 82 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10290 SdHoareTripleChecker+Valid, 44770 SdHoareTripleChecker+Invalid, 453 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 82 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 363 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:16:34,184 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10290 Valid, 44770 Invalid, 453 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [8 Valid, 82 Invalid, 0 Unknown, 363 Unchecked, 0.1s Time] [2021-11-23 17:16:34,188 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3340 states. [2021-11-23 17:16:34,339 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3340 to 3336. [2021-11-23 17:16:34,341 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3336 states, 3334 states have (on average 1.3854229154169166) internal successors, (4619), 3335 states have internal predecessors, (4619), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:16:34,346 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3336 states to 3336 states and 4619 transitions. [2021-11-23 17:16:34,346 INFO L78 Accepts]: Start accepts. Automaton has 3336 states and 4619 transitions. Word has length 135 [2021-11-23 17:16:34,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:16:34,346 INFO L470 AbstractCegarLoop]: Abstraction has 3336 states and 4619 transitions. [2021-11-23 17:16:34,346 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 12.625) internal successors, (606), 47 states have internal predecessors, (606), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:16:34,347 INFO L276 IsEmpty]: Start isEmpty. Operand 3336 states and 4619 transitions. [2021-11-23 17:16:34,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2021-11-23 17:16:34,348 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:16:34,348 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:16:34,375 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (74)] Forceful destruction successful, exit code 0 [2021-11-23 17:16:34,560 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (72)] Forceful destruction successful, exit code 0 [2021-11-23 17:16:34,751 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (73)] Forceful destruction successful, exit code 0 [2021-11-23 17:16:34,949 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 74 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,72 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,73 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:16:34,949 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:16:34,950 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:16:34,950 INFO L85 PathProgramCache]: Analyzing trace with hash -1609404376, now seen corresponding path program 1 times [2021-11-23 17:16:34,950 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:16:34,951 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [897826656] [2021-11-23 17:16:34,951 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:16:34,951 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:16:34,951 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:16:34,952 INFO L229 MonitoredProcess]: Starting monitored process 75 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:16:34,980 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (75)] Waiting until timeout for monitored process [2021-11-23 17:16:35,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:16:35,143 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:16:35,145 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:16:38,378 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 47 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:16:38,378 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:16:39,611 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 47 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:16:39,611 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:16:39,611 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [897826656] [2021-11-23 17:16:39,611 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [897826656] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:16:39,611 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [844950178] [2021-11-23 17:16:39,612 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:16:39,612 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:16:39,612 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:16:39,613 INFO L229 MonitoredProcess]: Starting monitored process 76 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:16:39,615 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (76)] Waiting until timeout for monitored process [2021-11-23 17:16:39,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:16:39,809 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:16:39,810 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:16:42,650 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 47 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:16:42,651 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:16:43,398 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 47 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:16:43,398 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [844950178] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:16:43,398 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [293511140] [2021-11-23 17:16:43,399 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:16:43,399 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:16:43,399 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:16:43,400 INFO L229 MonitoredProcess]: Starting monitored process 77 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:16:43,401 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (77)] Waiting until timeout for monitored process [2021-11-23 17:16:43,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:16:43,529 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:16:43,531 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:16:45,829 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 47 proven. 58 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:16:45,829 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:16:47,161 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 47 proven. 58 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:16:47,161 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [293511140] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:16:47,161 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:16:47,162 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 17:16:47,162 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1688966761] [2021-11-23 17:16:47,162 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:16:47,163 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 17:16:47,163 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:16:47,163 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 17:16:47,164 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 17:16:47,164 INFO L87 Difference]: Start difference. First operand 3336 states and 4619 transitions. Second operand has 34 states, 34 states have (on average 12.147058823529411) internal successors, (413), 33 states have internal predecessors, (413), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:16:48,152 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:16:48,153 INFO L93 Difference]: Finished difference Result 3976 states and 5449 transitions. [2021-11-23 17:16:48,153 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 17:16:48,153 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 12.147058823529411) internal successors, (413), 33 states have internal predecessors, (413), 0 states have call successors, (0), 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 135 [2021-11-23 17:16:48,153 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:16:48,156 INFO L225 Difference]: With dead ends: 3976 [2021-11-23 17:16:48,156 INFO L226 Difference]: Without dead ends: 3374 [2021-11-23 17:16:48,157 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 817 GetRequests, 775 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 443 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=248, Invalid=1644, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 17:16:48,158 INFO L933 BasicCegarLoop]: 1532 mSDtfsCounter, 10275 mSDsluCounter, 25883 mSDsCounter, 0 mSdLazyCounter, 62 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10275 SdHoareTripleChecker+Valid, 27415 SdHoareTripleChecker+Invalid, 190 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 62 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 123 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:16:48,158 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10275 Valid, 27415 Invalid, 190 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 62 Invalid, 0 Unknown, 123 Unchecked, 0.1s Time] [2021-11-23 17:16:48,160 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3374 states. [2021-11-23 17:16:48,282 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3374 to 3374. [2021-11-23 17:16:48,285 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3374 states, 3372 states have (on average 1.3819691577698696) internal successors, (4660), 3373 states have internal predecessors, (4660), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:16:48,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3374 states to 3374 states and 4660 transitions. [2021-11-23 17:16:48,289 INFO L78 Accepts]: Start accepts. Automaton has 3374 states and 4660 transitions. Word has length 135 [2021-11-23 17:16:48,289 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:16:48,290 INFO L470 AbstractCegarLoop]: Abstraction has 3374 states and 4660 transitions. [2021-11-23 17:16:48,290 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 12.147058823529411) internal successors, (413), 33 states have internal predecessors, (413), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:16:48,290 INFO L276 IsEmpty]: Start isEmpty. Operand 3374 states and 4660 transitions. [2021-11-23 17:16:48,291 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2021-11-23 17:16:48,292 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:16:48,292 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:16:48,294 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (76)] Forceful destruction successful, exit code 0 [2021-11-23 17:16:48,502 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (75)] Forceful destruction successful, exit code 0 [2021-11-23 17:16:48,716 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (77)] Forceful destruction successful, exit code 0 [2021-11-23 17:16:48,892 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 76 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,75 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,77 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:16:48,893 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:16:48,893 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:16:48,893 INFO L85 PathProgramCache]: Analyzing trace with hash -1588644728, now seen corresponding path program 1 times [2021-11-23 17:16:48,894 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:16:48,894 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [477646207] [2021-11-23 17:16:48,894 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:16:48,894 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:16:48,894 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:16:48,895 INFO L229 MonitoredProcess]: Starting monitored process 78 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:16:48,897 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (78)] Waiting until timeout for monitored process [2021-11-23 17:16:48,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:16:49,000 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:16:49,002 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:16:52,197 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 38 proven. 75 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:16:52,197 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:16:53,479 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 38 proven. 75 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:16:53,479 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:16:53,479 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [477646207] [2021-11-23 17:16:53,479 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [477646207] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:16:53,479 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1322202952] [2021-11-23 17:16:53,480 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:16:53,480 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:16:53,480 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:16:53,481 INFO L229 MonitoredProcess]: Starting monitored process 79 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:16:53,482 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (79)] Waiting until timeout for monitored process [2021-11-23 17:16:53,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:16:53,654 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:16:53,656 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:16:56,323 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 38 proven. 75 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:16:56,324 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:16:57,214 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 38 proven. 75 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:16:57,214 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1322202952] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:16:57,214 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [258254802] [2021-11-23 17:16:57,215 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:16:57,215 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:16:57,215 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:16:57,216 INFO L229 MonitoredProcess]: Starting monitored process 80 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:16:57,217 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (80)] Waiting until timeout for monitored process [2021-11-23 17:16:57,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:16:57,312 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:16:57,313 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:17:00,026 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 38 proven. 73 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:17:00,026 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:17:01,040 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 38 proven. 73 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:17:01,040 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [258254802] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:17:01,040 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:17:01,041 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 17:17:01,041 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [228836602] [2021-11-23 17:17:01,041 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:17:01,042 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 17:17:01,042 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:17:01,042 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 17:17:01,042 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 17:17:01,043 INFO L87 Difference]: Start difference. First operand 3374 states and 4660 transitions. Second operand has 34 states, 34 states have (on average 12.470588235294118) internal successors, (424), 33 states have internal predecessors, (424), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:17:02,203 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:17:02,204 INFO L93 Difference]: Finished difference Result 4117 states and 5613 transitions. [2021-11-23 17:17:02,204 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 17:17:02,204 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 12.470588235294118) internal successors, (424), 33 states have internal predecessors, (424), 0 states have call successors, (0), 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 135 [2021-11-23 17:17:02,205 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:17:02,210 INFO L225 Difference]: With dead ends: 4117 [2021-11-23 17:17:02,210 INFO L226 Difference]: Without dead ends: 3423 [2021-11-23 17:17:02,212 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 817 GetRequests, 775 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 445 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=259, Invalid=1633, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 17:17:02,213 INFO L933 BasicCegarLoop]: 1536 mSDtfsCounter, 10238 mSDsluCounter, 21968 mSDsCounter, 0 mSdLazyCounter, 93 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10238 SdHoareTripleChecker+Valid, 23504 SdHoareTripleChecker+Invalid, 327 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 93 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 227 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:17:02,214 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10238 Valid, 23504 Invalid, 327 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [7 Valid, 93 Invalid, 0 Unknown, 227 Unchecked, 0.1s Time] [2021-11-23 17:17:02,217 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3423 states. [2021-11-23 17:17:02,397 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3423 to 3402. [2021-11-23 17:17:02,399 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3402 states, 3400 states have (on average 1.38) internal successors, (4692), 3401 states have internal predecessors, (4692), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:17:02,405 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3402 states to 3402 states and 4692 transitions. [2021-11-23 17:17:02,405 INFO L78 Accepts]: Start accepts. Automaton has 3402 states and 4692 transitions. Word has length 135 [2021-11-23 17:17:02,406 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:17:02,406 INFO L470 AbstractCegarLoop]: Abstraction has 3402 states and 4692 transitions. [2021-11-23 17:17:02,406 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 12.470588235294118) internal successors, (424), 33 states have internal predecessors, (424), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:17:02,406 INFO L276 IsEmpty]: Start isEmpty. Operand 3402 states and 4692 transitions. [2021-11-23 17:17:02,408 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2021-11-23 17:17:02,408 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:17:02,408 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:17:02,448 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (80)] Forceful destruction successful, exit code 0 [2021-11-23 17:17:02,632 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (78)] Forceful destruction successful, exit code 0 [2021-11-23 17:17:02,824 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (79)] Forceful destruction successful, exit code 0 [2021-11-23 17:17:03,022 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 80 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,78 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,79 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:17:03,022 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:17:03,022 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:17:03,022 INFO L85 PathProgramCache]: Analyzing trace with hash 1815989338, now seen corresponding path program 1 times [2021-11-23 17:17:03,023 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:17:03,023 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1557697805] [2021-11-23 17:17:03,023 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:17:03,023 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:17:03,024 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:17:03,025 INFO L229 MonitoredProcess]: Starting monitored process 81 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:17:03,030 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (81)] Waiting until timeout for monitored process [2021-11-23 17:17:03,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:17:03,143 INFO L263 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:17:03,144 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:17:06,747 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 24 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:17:06,748 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:17:07,752 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 24 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:17:07,752 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:17:07,752 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1557697805] [2021-11-23 17:17:07,752 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1557697805] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:17:07,752 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [708033110] [2021-11-23 17:17:07,752 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:17:07,752 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:17:07,753 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:17:07,753 INFO L229 MonitoredProcess]: Starting monitored process 82 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:17:07,755 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (82)] Waiting until timeout for monitored process [2021-11-23 17:17:07,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:17:07,950 INFO L263 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:17:07,951 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:17:11,136 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 24 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:17:11,136 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:17:11,756 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 24 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:17:11,757 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [708033110] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:17:11,757 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1128777051] [2021-11-23 17:17:11,757 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:17:11,757 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:17:11,757 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:17:11,758 INFO L229 MonitoredProcess]: Starting monitored process 83 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:17:11,759 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (83)] Waiting until timeout for monitored process [2021-11-23 17:17:11,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:17:11,850 INFO L263 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:17:11,852 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:17:14,564 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 24 proven. 80 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:17:14,565 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:17:15,711 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 24 proven. 80 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:17:15,711 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1128777051] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:17:15,711 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:17:15,711 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 17:17:15,712 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1995841402] [2021-11-23 17:17:15,712 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:17:15,712 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 17:17:15,713 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:17:15,713 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 17:17:15,713 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 17:17:15,714 INFO L87 Difference]: Start difference. First operand 3402 states and 4692 transitions. Second operand has 34 states, 34 states have (on average 12.911764705882353) internal successors, (439), 33 states have internal predecessors, (439), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:17:16,714 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:17:16,714 INFO L93 Difference]: Finished difference Result 4357 states and 5884 transitions. [2021-11-23 17:17:16,715 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 17:17:16,715 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 12.911764705882353) internal successors, (439), 33 states have internal predecessors, (439), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 135 [2021-11-23 17:17:16,715 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:17:16,720 INFO L225 Difference]: With dead ends: 4357 [2021-11-23 17:17:16,721 INFO L226 Difference]: Without dead ends: 3681 [2021-11-23 17:17:16,723 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 818 GetRequests, 776 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 443 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=244, Invalid=1648, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 17:17:16,724 INFO L933 BasicCegarLoop]: 1539 mSDtfsCounter, 7377 mSDsluCounter, 26043 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7377 SdHoareTripleChecker+Valid, 27582 SdHoareTripleChecker+Invalid, 217 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 164 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:17:16,724 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7377 Valid, 27582 Invalid, 217 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 50 Invalid, 0 Unknown, 164 Unchecked, 0.1s Time] [2021-11-23 17:17:16,728 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3681 states. [2021-11-23 17:17:16,948 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3681 to 3681. [2021-11-23 17:17:16,951 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3681 states, 3679 states have (on average 1.3617830932318564) internal successors, (5010), 3680 states have internal predecessors, (5010), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:17:16,958 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3681 states to 3681 states and 5010 transitions. [2021-11-23 17:17:16,959 INFO L78 Accepts]: Start accepts. Automaton has 3681 states and 5010 transitions. Word has length 135 [2021-11-23 17:17:16,959 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:17:16,962 INFO L470 AbstractCegarLoop]: Abstraction has 3681 states and 5010 transitions. [2021-11-23 17:17:16,962 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 12.911764705882353) internal successors, (439), 33 states have internal predecessors, (439), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:17:16,963 INFO L276 IsEmpty]: Start isEmpty. Operand 3681 states and 5010 transitions. [2021-11-23 17:17:16,965 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2021-11-23 17:17:16,965 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:17:16,966 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:17:16,986 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (81)] Forceful destruction successful, exit code 0 [2021-11-23 17:17:17,205 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (83)] Forceful destruction successful, exit code 0 [2021-11-23 17:17:17,383 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (82)] Ended with exit code 0 [2021-11-23 17:17:17,582 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 81 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,83 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,82 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:17:17,582 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:17:17,582 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:17:17,582 INFO L85 PathProgramCache]: Analyzing trace with hash 367260206, now seen corresponding path program 1 times [2021-11-23 17:17:17,583 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:17:17,583 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1209651956] [2021-11-23 17:17:17,583 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:17:17,583 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:17:17,583 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:17:17,585 INFO L229 MonitoredProcess]: Starting monitored process 84 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:17:17,586 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (84)] Waiting until timeout for monitored process [2021-11-23 17:17:17,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:17:17,688 INFO L263 TraceCheckSpWp]: Trace formula consists of 288 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:17:17,689 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:17:20,366 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 74 proven. 28 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 17:17:20,367 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:17:21,236 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 74 proven. 28 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 17:17:21,236 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:17:21,236 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1209651956] [2021-11-23 17:17:21,236 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1209651956] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:17:21,237 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [363225708] [2021-11-23 17:17:21,237 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:17:21,237 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:17:21,237 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:17:21,238 INFO L229 MonitoredProcess]: Starting monitored process 85 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:17:21,239 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (85)] Waiting until timeout for monitored process [2021-11-23 17:17:21,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:17:21,418 INFO L263 TraceCheckSpWp]: Trace formula consists of 288 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:17:21,420 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:17:24,050 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 39 proven. 74 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:17:24,050 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:17:25,313 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 39 proven. 74 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:17:25,314 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [363225708] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:17:25,314 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1489473598] [2021-11-23 17:17:25,314 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:17:25,314 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:17:25,315 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:17:25,317 INFO L229 MonitoredProcess]: Starting monitored process 86 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:17:25,319 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (86)] Waiting until timeout for monitored process [2021-11-23 17:17:25,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:17:25,430 INFO L263 TraceCheckSpWp]: Trace formula consists of 288 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:17:25,432 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:17:28,151 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 39 proven. 72 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:17:28,151 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:17:29,143 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 39 proven. 72 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:17:29,143 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1489473598] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:17:29,143 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:17:29,143 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 13, 13, 8, 8] total 38 [2021-11-23 17:17:29,144 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [198519782] [2021-11-23 17:17:29,144 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:17:29,144 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-23 17:17:29,145 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:17:29,145 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-23 17:17:29,145 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=1319, Unknown=0, NotChecked=0, Total=1482 [2021-11-23 17:17:29,145 INFO L87 Difference]: Start difference. First operand 3681 states and 5010 transitions. Second operand has 39 states, 39 states have (on average 14.256410256410257) internal successors, (556), 38 states have internal predecessors, (556), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:17:31,390 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:17:31,390 INFO L93 Difference]: Finished difference Result 4599 states and 6185 transitions. [2021-11-23 17:17:31,390 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-23 17:17:31,391 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 14.256410256410257) internal successors, (556), 38 states have internal predecessors, (556), 0 states have call successors, (0), 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 135 [2021-11-23 17:17:31,391 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:17:31,395 INFO L225 Difference]: With dead ends: 4599 [2021-11-23 17:17:31,395 INFO L226 Difference]: Without dead ends: 3946 [2021-11-23 17:17:31,397 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 831 GetRequests, 773 SyntacticMatches, 2 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 795 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=398, Invalid=2908, Unknown=0, NotChecked=0, Total=3306 [2021-11-23 17:17:31,397 INFO L933 BasicCegarLoop]: 1527 mSDtfsCounter, 11831 mSDsluCounter, 27705 mSDsCounter, 0 mSdLazyCounter, 90 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11831 SdHoareTripleChecker+Valid, 29232 SdHoareTripleChecker+Invalid, 304 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 90 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 206 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:17:31,398 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11831 Valid, 29232 Invalid, 304 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 90 Invalid, 0 Unknown, 206 Unchecked, 0.1s Time] [2021-11-23 17:17:31,401 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3946 states. [2021-11-23 17:17:31,605 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3946 to 3845. [2021-11-23 17:17:31,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3845 states, 3843 states have (on average 1.3538901899557638) internal successors, (5203), 3844 states have internal predecessors, (5203), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:17:31,611 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3845 states to 3845 states and 5203 transitions. [2021-11-23 17:17:31,612 INFO L78 Accepts]: Start accepts. Automaton has 3845 states and 5203 transitions. Word has length 135 [2021-11-23 17:17:31,612 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:17:31,612 INFO L470 AbstractCegarLoop]: Abstraction has 3845 states and 5203 transitions. [2021-11-23 17:17:31,612 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 14.256410256410257) internal successors, (556), 38 states have internal predecessors, (556), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:17:31,612 INFO L276 IsEmpty]: Start isEmpty. Operand 3845 states and 5203 transitions. [2021-11-23 17:17:31,614 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2021-11-23 17:17:31,614 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:17:31,614 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:17:31,625 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (84)] Forceful destruction successful, exit code 0 [2021-11-23 17:17:31,819 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (85)] Forceful destruction successful, exit code 0 [2021-11-23 17:17:32,041 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (86)] Forceful destruction successful, exit code 0 [2021-11-23 17:17:32,218 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 84 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,85 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,86 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:17:32,218 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:17:32,218 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:17:32,219 INFO L85 PathProgramCache]: Analyzing trace with hash -541744850, now seen corresponding path program 1 times [2021-11-23 17:17:32,219 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:17:32,219 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [660108571] [2021-11-23 17:17:32,219 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:17:32,219 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:17:32,219 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:17:32,220 INFO L229 MonitoredProcess]: Starting monitored process 87 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:17:32,221 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (87)] Waiting until timeout for monitored process [2021-11-23 17:17:32,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:17:32,322 INFO L263 TraceCheckSpWp]: Trace formula consists of 288 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:17:32,323 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:17:34,408 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 78 proven. 22 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 17:17:34,408 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:17:35,531 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 78 proven. 22 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 17:17:35,532 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:17:35,532 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [660108571] [2021-11-23 17:17:35,532 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [660108571] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:17:35,532 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1591927815] [2021-11-23 17:17:35,532 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:17:35,532 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:17:35,533 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:17:35,533 INFO L229 MonitoredProcess]: Starting monitored process 88 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:17:35,536 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (88)] Waiting until timeout for monitored process [2021-11-23 17:17:35,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:17:35,710 INFO L263 TraceCheckSpWp]: Trace formula consists of 288 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:17:35,712 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:17:40,398 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 31 proven. 82 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:17:40,398 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:17:41,565 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 31 proven. 82 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:17:41,566 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1591927815] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:17:41,566 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1712093476] [2021-11-23 17:17:41,566 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:17:41,566 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:17:41,566 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:17:41,567 INFO L229 MonitoredProcess]: Starting monitored process 89 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:17:41,568 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (89)] Waiting until timeout for monitored process [2021-11-23 17:17:41,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:17:41,661 INFO L263 TraceCheckSpWp]: Trace formula consists of 288 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:17:41,662 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:17:44,708 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 31 proven. 78 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:17:44,708 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:17:45,847 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 31 proven. 78 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:17:45,847 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1712093476] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:17:45,847 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:17:45,848 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 13, 13, 8, 8] total 47 [2021-11-23 17:17:45,848 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [375308712] [2021-11-23 17:17:45,848 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:17:45,849 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-23 17:17:45,849 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:17:45,849 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-23 17:17:45,849 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=2056, Unknown=0, NotChecked=0, Total=2256 [2021-11-23 17:17:45,850 INFO L87 Difference]: Start difference. First operand 3845 states and 5203 transitions. Second operand has 48 states, 48 states have (on average 12.875) internal successors, (618), 47 states have internal predecessors, (618), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:17:48,494 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:17:48,494 INFO L93 Difference]: Finished difference Result 4953 states and 6610 transitions. [2021-11-23 17:17:48,494 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-11-23 17:17:48,495 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 12.875) internal successors, (618), 47 states have internal predecessors, (618), 0 states have call successors, (0), 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 135 [2021-11-23 17:17:48,495 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:17:48,499 INFO L225 Difference]: With dead ends: 4953 [2021-11-23 17:17:48,499 INFO L226 Difference]: Without dead ends: 4296 [2021-11-23 17:17:48,501 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 830 GetRequests, 763 SyntacticMatches, 3 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1079 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=421, Invalid=3869, Unknown=0, NotChecked=0, Total=4290 [2021-11-23 17:17:48,502 INFO L933 BasicCegarLoop]: 1562 mSDtfsCounter, 11820 mSDsluCounter, 42284 mSDsCounter, 0 mSdLazyCounter, 198 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11820 SdHoareTripleChecker+Valid, 43846 SdHoareTripleChecker+Invalid, 475 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 198 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 269 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:17:48,502 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11820 Valid, 43846 Invalid, 475 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [8 Valid, 198 Invalid, 0 Unknown, 269 Unchecked, 0.2s Time] [2021-11-23 17:17:48,505 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4296 states. [2021-11-23 17:17:48,696 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4296 to 4079. [2021-11-23 17:17:48,700 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4079 states, 4077 states have (on average 1.3443708609271523) internal successors, (5481), 4078 states have internal predecessors, (5481), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:17:48,705 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4079 states to 4079 states and 5481 transitions. [2021-11-23 17:17:48,705 INFO L78 Accepts]: Start accepts. Automaton has 4079 states and 5481 transitions. Word has length 135 [2021-11-23 17:17:48,705 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:17:48,705 INFO L470 AbstractCegarLoop]: Abstraction has 4079 states and 5481 transitions. [2021-11-23 17:17:48,705 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 12.875) internal successors, (618), 47 states have internal predecessors, (618), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:17:48,706 INFO L276 IsEmpty]: Start isEmpty. Operand 4079 states and 5481 transitions. [2021-11-23 17:17:48,707 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2021-11-23 17:17:48,708 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:17:48,708 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:17:48,733 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (89)] Ended with exit code 0 [2021-11-23 17:17:48,910 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (88)] Forceful destruction successful, exit code 0 [2021-11-23 17:17:49,119 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (87)] Forceful destruction successful, exit code 0 [2021-11-23 17:17:49,308 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 89 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,88 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,87 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:17:49,309 INFO L402 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:17:49,309 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:17:49,309 INFO L85 PathProgramCache]: Analyzing trace with hash 189500271, now seen corresponding path program 1 times [2021-11-23 17:17:49,309 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:17:49,309 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1345265121] [2021-11-23 17:17:49,309 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:17:49,310 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:17:49,310 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:17:49,310 INFO L229 MonitoredProcess]: Starting monitored process 90 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:17:49,311 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (90)] Waiting until timeout for monitored process [2021-11-23 17:17:49,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:17:49,410 INFO L263 TraceCheckSpWp]: Trace formula consists of 290 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:17:49,411 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:17:50,686 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 97 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-23 17:17:50,686 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:17:50,686 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:17:50,686 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1345265121] [2021-11-23 17:17:50,687 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1345265121] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:17:50,687 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:17:50,687 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:17:50,687 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1083503948] [2021-11-23 17:17:50,687 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:17:50,687 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:17:50,687 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:17:50,688 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:17:50,688 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:17:50,688 INFO L87 Difference]: Start difference. First operand 4079 states and 5481 transitions. Second operand has 6 states, 6 states have (on average 21.166666666666668) internal successors, (127), 5 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) [2021-11-23 17:17:50,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:17:50,966 INFO L93 Difference]: Finished difference Result 5694 states and 7555 transitions. [2021-11-23 17:17:50,966 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:17:50,966 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 21.166666666666668) internal successors, (127), 5 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) Word has length 136 [2021-11-23 17:17:50,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:17:50,971 INFO L225 Difference]: With dead ends: 5694 [2021-11-23 17:17:50,971 INFO L226 Difference]: Without dead ends: 4920 [2021-11-23 17:17:50,973 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 131 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:17:50,973 INFO L933 BasicCegarLoop]: 1536 mSDtfsCounter, 2945 mSDsluCounter, 1641 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2945 SdHoareTripleChecker+Valid, 3177 SdHoareTripleChecker+Invalid, 56 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 46 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:17:50,973 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2945 Valid, 3177 Invalid, 56 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 9 Invalid, 0 Unknown, 46 Unchecked, 0.0s Time] [2021-11-23 17:17:50,977 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4920 states. [2021-11-23 17:17:51,248 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4920 to 4892. [2021-11-23 17:17:51,251 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4892 states, 4890 states have (on average 1.3321063394683026) internal successors, (6514), 4891 states have internal predecessors, (6514), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:17:51,256 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4892 states to 4892 states and 6514 transitions. [2021-11-23 17:17:51,257 INFO L78 Accepts]: Start accepts. Automaton has 4892 states and 6514 transitions. Word has length 136 [2021-11-23 17:17:51,257 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:17:51,257 INFO L470 AbstractCegarLoop]: Abstraction has 4892 states and 6514 transitions. [2021-11-23 17:17:51,257 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 21.166666666666668) internal successors, (127), 5 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) [2021-11-23 17:17:51,257 INFO L276 IsEmpty]: Start isEmpty. Operand 4892 states and 6514 transitions. [2021-11-23 17:17:51,259 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2021-11-23 17:17:51,259 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:17:51,260 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:17:51,270 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (90)] Forceful destruction successful, exit code 0 [2021-11-23 17:17:51,460 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 90 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:17:51,460 INFO L402 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:17:51,461 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:17:51,461 INFO L85 PathProgramCache]: Analyzing trace with hash 1802962975, now seen corresponding path program 1 times [2021-11-23 17:17:51,461 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:17:51,461 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [919507559] [2021-11-23 17:17:51,461 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:17:51,461 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:17:51,462 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:17:51,462 INFO L229 MonitoredProcess]: Starting monitored process 91 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:17:51,464 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (91)] Waiting until timeout for monitored process [2021-11-23 17:17:51,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:17:51,574 INFO L263 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:17:51,575 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:17:53,282 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 42 proven. 26 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 17:17:53,283 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:17:54,290 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 42 proven. 26 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 17:17:54,291 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:17:54,291 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [919507559] [2021-11-23 17:17:54,291 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [919507559] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:17:54,291 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1612145000] [2021-11-23 17:17:54,291 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:17:54,291 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:17:54,291 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:17:54,292 INFO L229 MonitoredProcess]: Starting monitored process 92 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:17:54,297 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (92)] Waiting until timeout for monitored process [2021-11-23 17:17:54,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:17:54,475 INFO L263 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:17:54,476 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:17:56,027 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 42 proven. 26 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 17:17:56,028 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:17:56,877 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 42 proven. 26 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 17:17:56,877 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1612145000] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:17:56,878 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [508479327] [2021-11-23 17:17:56,878 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:17:56,878 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:17:56,878 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:17:56,879 INFO L229 MonitoredProcess]: Starting monitored process 93 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:17:56,880 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (93)] Waiting until timeout for monitored process [2021-11-23 17:17:57,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:17:57,008 INFO L263 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:17:57,010 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:17:58,555 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 42 proven. 26 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 17:17:58,556 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:17:59,416 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 42 proven. 26 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 17:17:59,416 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [508479327] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:17:59,416 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:17:59,417 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:17:59,417 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1302274035] [2021-11-23 17:17:59,417 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:17:59,418 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:17:59,418 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:17:59,418 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:17:59,418 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:17:59,418 INFO L87 Difference]: Start difference. First operand 4892 states and 6514 transitions. Second operand has 16 states, 16 states have (on average 12.1875) internal successors, (195), 15 states have internal predecessors, (195), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:00,205 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:18:00,205 INFO L93 Difference]: Finished difference Result 5789 states and 7641 transitions. [2021-11-23 17:18:00,206 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 17:18:00,206 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 12.1875) internal successors, (195), 15 states have internal predecessors, (195), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 136 [2021-11-23 17:18:00,206 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:18:00,211 INFO L225 Difference]: With dead ends: 5789 [2021-11-23 17:18:00,211 INFO L226 Difference]: Without dead ends: 4901 [2021-11-23 17:18:00,214 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 819 GetRequests, 797 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=116, Invalid=436, Unknown=0, NotChecked=0, Total=552 [2021-11-23 17:18:00,214 INFO L933 BasicCegarLoop]: 1537 mSDtfsCounter, 5892 mSDsluCounter, 10856 mSDsCounter, 0 mSdLazyCounter, 55 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5892 SdHoareTripleChecker+Valid, 12393 SdHoareTripleChecker+Invalid, 131 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 55 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 73 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:18:00,214 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5892 Valid, 12393 Invalid, 131 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 55 Invalid, 0 Unknown, 73 Unchecked, 0.1s Time] [2021-11-23 17:18:00,219 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4901 states. [2021-11-23 17:18:00,494 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4901 to 4871. [2021-11-23 17:18:00,497 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4871 states, 4869 states have (on average 1.3298418566440748) internal successors, (6475), 4870 states have internal predecessors, (6475), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:00,503 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4871 states to 4871 states and 6475 transitions. [2021-11-23 17:18:00,503 INFO L78 Accepts]: Start accepts. Automaton has 4871 states and 6475 transitions. Word has length 136 [2021-11-23 17:18:00,504 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:18:00,504 INFO L470 AbstractCegarLoop]: Abstraction has 4871 states and 6475 transitions. [2021-11-23 17:18:00,504 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 12.1875) internal successors, (195), 15 states have internal predecessors, (195), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:00,504 INFO L276 IsEmpty]: Start isEmpty. Operand 4871 states and 6475 transitions. [2021-11-23 17:18:00,507 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2021-11-23 17:18:00,508 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:18:00,508 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:18:00,526 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (92)] Forceful destruction successful, exit code 0 [2021-11-23 17:18:00,721 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (91)] Forceful destruction successful, exit code 0 [2021-11-23 17:18:00,936 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (93)] Forceful destruction successful, exit code 0 [2021-11-23 17:18:01,111 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 92 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,91 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,93 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:18:01,111 INFO L402 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:18:01,111 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:18:01,112 INFO L85 PathProgramCache]: Analyzing trace with hash -499628542, now seen corresponding path program 1 times [2021-11-23 17:18:01,112 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:18:01,112 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1665511642] [2021-11-23 17:18:01,112 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:01,112 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:18:01,112 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:18:01,113 INFO L229 MonitoredProcess]: Starting monitored process 94 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:18:01,114 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (94)] Waiting until timeout for monitored process [2021-11-23 17:18:01,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:01,223 INFO L263 TraceCheckSpWp]: Trace formula consists of 294 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:18:01,224 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:05,024 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 16 proven. 93 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:05,024 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:18:06,110 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 16 proven. 93 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:06,110 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:18:06,110 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1665511642] [2021-11-23 17:18:06,111 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1665511642] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:18:06,111 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [757925252] [2021-11-23 17:18:06,111 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:06,111 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:18:06,111 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:18:06,112 INFO L229 MonitoredProcess]: Starting monitored process 95 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:18:06,113 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (95)] Waiting until timeout for monitored process [2021-11-23 17:18:06,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:06,277 INFO L263 TraceCheckSpWp]: Trace formula consists of 294 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:18:06,278 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:09,628 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 16 proven. 93 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:09,628 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:18:10,329 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 16 proven. 93 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:10,329 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [757925252] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:18:10,329 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [168294868] [2021-11-23 17:18:10,329 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:10,329 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:18:10,330 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:18:10,330 INFO L229 MonitoredProcess]: Starting monitored process 96 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:18:10,331 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (96)] Waiting until timeout for monitored process [2021-11-23 17:18:10,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:10,425 INFO L263 TraceCheckSpWp]: Trace formula consists of 294 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:18:10,426 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:13,249 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 16 proven. 87 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:18:13,249 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:18:14,505 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 16 proven. 87 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:18:14,505 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [168294868] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:18:14,506 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:18:14,506 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 17:18:14,506 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [469385134] [2021-11-23 17:18:14,506 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:18:14,507 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 17:18:14,507 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:18:14,507 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 17:18:14,508 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 17:18:14,508 INFO L87 Difference]: Start difference. First operand 4871 states and 6475 transitions. Second operand has 34 states, 34 states have (on average 13.205882352941176) internal successors, (449), 33 states have internal predecessors, (449), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:15,655 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:18:15,655 INFO L93 Difference]: Finished difference Result 6204 states and 8125 transitions. [2021-11-23 17:18:15,655 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 17:18:15,655 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 13.205882352941176) internal successors, (449), 33 states have internal predecessors, (449), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 136 [2021-11-23 17:18:15,656 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:18:15,660 INFO L225 Difference]: With dead ends: 6204 [2021-11-23 17:18:15,661 INFO L226 Difference]: Without dead ends: 5408 [2021-11-23 17:18:15,662 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 823 GetRequests, 781 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 443 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=250, Invalid=1642, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 17:18:15,663 INFO L933 BasicCegarLoop]: 1543 mSDtfsCounter, 8854 mSDsluCounter, 24616 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8854 SdHoareTripleChecker+Valid, 26159 SdHoareTripleChecker+Invalid, 192 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 139 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:18:15,663 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8854 Valid, 26159 Invalid, 192 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 48 Invalid, 0 Unknown, 139 Unchecked, 0.1s Time] [2021-11-23 17:18:15,667 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5408 states. [2021-11-23 17:18:15,960 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5408 to 5408. [2021-11-23 17:18:15,963 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5408 states, 5406 states have (on average 1.3150203477617461) internal successors, (7109), 5407 states have internal predecessors, (7109), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:15,969 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5408 states to 5408 states and 7109 transitions. [2021-11-23 17:18:15,969 INFO L78 Accepts]: Start accepts. Automaton has 5408 states and 7109 transitions. Word has length 136 [2021-11-23 17:18:15,969 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:18:15,969 INFO L470 AbstractCegarLoop]: Abstraction has 5408 states and 7109 transitions. [2021-11-23 17:18:15,969 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 13.205882352941176) internal successors, (449), 33 states have internal predecessors, (449), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:15,970 INFO L276 IsEmpty]: Start isEmpty. Operand 5408 states and 7109 transitions. [2021-11-23 17:18:15,972 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2021-11-23 17:18:15,972 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:18:15,973 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:18:15,983 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (94)] Forceful destruction successful, exit code 0 [2021-11-23 17:18:16,194 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (96)] Forceful destruction successful, exit code 0 [2021-11-23 17:18:16,378 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (95)] Forceful destruction successful, exit code 0 [2021-11-23 17:18:16,573 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 94 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,96 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,95 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:18:16,574 INFO L402 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:18:16,574 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:18:16,574 INFO L85 PathProgramCache]: Analyzing trace with hash 908802149, now seen corresponding path program 1 times [2021-11-23 17:18:16,574 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:18:16,574 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1510071833] [2021-11-23 17:18:16,574 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:16,574 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:18:16,575 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:18:16,575 INFO L229 MonitoredProcess]: Starting monitored process 97 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:18:16,580 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (97)] Waiting until timeout for monitored process [2021-11-23 17:18:16,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:16,682 INFO L263 TraceCheckSpWp]: Trace formula consists of 294 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:18:16,683 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:20,322 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 25 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:20,322 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:18:21,311 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 25 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:21,311 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:18:21,311 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1510071833] [2021-11-23 17:18:21,312 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1510071833] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:18:21,312 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [643809356] [2021-11-23 17:18:21,312 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:21,312 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:18:21,312 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:18:21,313 INFO L229 MonitoredProcess]: Starting monitored process 98 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:18:21,344 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (98)] Waiting until timeout for monitored process [2021-11-23 17:18:21,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:21,537 INFO L263 TraceCheckSpWp]: Trace formula consists of 294 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:18:21,538 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:24,914 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 25 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:24,914 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:18:25,542 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 25 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:25,543 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [643809356] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:18:25,543 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [185218130] [2021-11-23 17:18:25,543 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:25,543 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:18:25,543 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:18:25,544 INFO L229 MonitoredProcess]: Starting monitored process 99 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:18:25,545 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (99)] Waiting until timeout for monitored process [2021-11-23 17:18:25,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:25,634 INFO L263 TraceCheckSpWp]: Trace formula consists of 294 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:18:25,635 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:28,420 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 25 proven. 80 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:18:28,421 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:18:29,551 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 25 proven. 80 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:18:29,551 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [185218130] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:18:29,551 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:18:29,552 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 17:18:29,552 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [499173862] [2021-11-23 17:18:29,552 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:18:29,552 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 17:18:29,553 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:18:29,553 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 17:18:29,553 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 17:18:29,553 INFO L87 Difference]: Start difference. First operand 5408 states and 7109 transitions. Second operand has 34 states, 34 states have (on average 12.882352941176471) internal successors, (438), 33 states have internal predecessors, (438), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:30,820 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:18:30,820 INFO L93 Difference]: Finished difference Result 6113 states and 8002 transitions. [2021-11-23 17:18:30,820 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 17:18:30,820 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 12.882352941176471) internal successors, (438), 33 states have internal predecessors, (438), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 136 [2021-11-23 17:18:30,821 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:18:30,826 INFO L225 Difference]: With dead ends: 6113 [2021-11-23 17:18:30,826 INFO L226 Difference]: Without dead ends: 5443 [2021-11-23 17:18:30,829 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 823 GetRequests, 781 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 443 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=256, Invalid=1636, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 17:18:30,829 INFO L933 BasicCegarLoop]: 1541 mSDtfsCounter, 11644 mSDsluCounter, 26409 mSDsCounter, 0 mSdLazyCounter, 92 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11644 SdHoareTripleChecker+Valid, 27950 SdHoareTripleChecker+Invalid, 260 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 92 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 161 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:18:30,830 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11644 Valid, 27950 Invalid, 260 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 92 Invalid, 0 Unknown, 161 Unchecked, 0.1s Time] [2021-11-23 17:18:30,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5443 states. [2021-11-23 17:18:31,137 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5443 to 5395. [2021-11-23 17:18:31,140 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5395 states, 5393 states have (on average 1.3146671611348044) internal successors, (7090), 5394 states have internal predecessors, (7090), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:31,146 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5395 states to 5395 states and 7090 transitions. [2021-11-23 17:18:31,147 INFO L78 Accepts]: Start accepts. Automaton has 5395 states and 7090 transitions. Word has length 136 [2021-11-23 17:18:31,147 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:18:31,147 INFO L470 AbstractCegarLoop]: Abstraction has 5395 states and 7090 transitions. [2021-11-23 17:18:31,147 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 12.882352941176471) internal successors, (438), 33 states have internal predecessors, (438), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:31,147 INFO L276 IsEmpty]: Start isEmpty. Operand 5395 states and 7090 transitions. [2021-11-23 17:18:31,150 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2021-11-23 17:18:31,150 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:18:31,150 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:18:31,164 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (97)] Forceful destruction successful, exit code 0 [2021-11-23 17:18:31,353 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (98)] Forceful destruction successful, exit code 0 [2021-11-23 17:18:31,577 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (99)] Forceful destruction successful, exit code 0 [2021-11-23 17:18:31,751 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 97 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,98 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,99 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:18:31,752 INFO L402 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:18:31,753 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:18:31,753 INFO L85 PathProgramCache]: Analyzing trace with hash 204673352, now seen corresponding path program 1 times [2021-11-23 17:18:31,754 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:18:31,754 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [924518971] [2021-11-23 17:18:31,754 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:31,754 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:18:31,754 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:18:31,755 INFO L229 MonitoredProcess]: Starting monitored process 100 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:18:31,756 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (100)] Waiting until timeout for monitored process [2021-11-23 17:18:31,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:31,868 INFO L263 TraceCheckSpWp]: Trace formula consists of 294 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:18:31,870 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:35,656 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 16 proven. 93 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:35,656 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:18:36,773 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 16 proven. 93 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:36,773 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:18:36,773 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [924518971] [2021-11-23 17:18:36,773 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [924518971] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:18:36,774 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1864079964] [2021-11-23 17:18:36,774 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:36,774 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:18:36,774 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:18:36,776 INFO L229 MonitoredProcess]: Starting monitored process 101 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:18:36,778 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (101)] Waiting until timeout for monitored process [2021-11-23 17:18:36,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:36,963 INFO L263 TraceCheckSpWp]: Trace formula consists of 294 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:18:36,965 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:40,376 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 16 proven. 93 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:40,376 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:18:41,094 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 16 proven. 93 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:41,094 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1864079964] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:18:41,094 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [214875167] [2021-11-23 17:18:41,094 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:41,095 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:18:41,095 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:18:41,096 INFO L229 MonitoredProcess]: Starting monitored process 102 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:18:41,097 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (102)] Waiting until timeout for monitored process [2021-11-23 17:18:41,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:41,188 INFO L263 TraceCheckSpWp]: Trace formula consists of 294 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:18:41,190 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:44,011 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 16 proven. 87 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:18:44,011 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:18:45,269 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 16 proven. 87 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:18:45,269 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [214875167] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:18:45,269 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:18:45,270 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 17:18:45,270 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1153892965] [2021-11-23 17:18:45,270 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:18:45,271 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 17:18:45,271 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:18:45,271 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 17:18:45,272 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 17:18:45,272 INFO L87 Difference]: Start difference. First operand 5395 states and 7090 transitions. Second operand has 34 states, 34 states have (on average 13.205882352941176) internal successors, (449), 33 states have internal predecessors, (449), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:46,458 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:18:46,458 INFO L93 Difference]: Finished difference Result 6149 states and 8039 transitions. [2021-11-23 17:18:46,459 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 17:18:46,459 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 13.205882352941176) internal successors, (449), 33 states have internal predecessors, (449), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 136 [2021-11-23 17:18:46,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:18:46,464 INFO L225 Difference]: With dead ends: 6149 [2021-11-23 17:18:46,464 INFO L226 Difference]: Without dead ends: 5477 [2021-11-23 17:18:46,466 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 823 GetRequests, 781 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 443 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=245, Invalid=1647, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 17:18:46,466 INFO L933 BasicCegarLoop]: 1544 mSDtfsCounter, 7333 mSDsluCounter, 26202 mSDsCounter, 0 mSdLazyCounter, 87 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7333 SdHoareTripleChecker+Valid, 27746 SdHoareTripleChecker+Invalid, 280 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 87 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 189 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:18:46,466 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7333 Valid, 27746 Invalid, 280 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 87 Invalid, 0 Unknown, 189 Unchecked, 0.1s Time] [2021-11-23 17:18:46,471 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5477 states. [2021-11-23 17:18:46,744 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5477 to 5413. [2021-11-23 17:18:46,748 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5413 states, 5411 states have (on average 1.314359637774903) internal successors, (7112), 5412 states have internal predecessors, (7112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:46,755 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5413 states to 5413 states and 7112 transitions. [2021-11-23 17:18:46,755 INFO L78 Accepts]: Start accepts. Automaton has 5413 states and 7112 transitions. Word has length 136 [2021-11-23 17:18:46,755 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:18:46,755 INFO L470 AbstractCegarLoop]: Abstraction has 5413 states and 7112 transitions. [2021-11-23 17:18:46,755 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 13.205882352941176) internal successors, (449), 33 states have internal predecessors, (449), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:46,755 INFO L276 IsEmpty]: Start isEmpty. Operand 5413 states and 7112 transitions. [2021-11-23 17:18:46,758 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2021-11-23 17:18:46,759 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:18:46,759 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:18:46,786 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (102)] Forceful destruction successful, exit code 0 [2021-11-23 17:18:46,966 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (101)] Forceful destruction successful, exit code 0 [2021-11-23 17:18:47,171 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (100)] Ended with exit code 0 [2021-11-23 17:18:47,361 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 102 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,101 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,100 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:18:47,362 INFO L402 AbstractCegarLoop]: === Iteration 51 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:18:47,362 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:18:47,362 INFO L85 PathProgramCache]: Analyzing trace with hash -461244488, now seen corresponding path program 1 times [2021-11-23 17:18:47,362 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:18:47,363 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [208529700] [2021-11-23 17:18:47,363 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:47,363 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:18:47,363 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:18:47,364 INFO L229 MonitoredProcess]: Starting monitored process 103 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:18:47,365 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (103)] Waiting until timeout for monitored process [2021-11-23 17:18:47,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:47,470 INFO L263 TraceCheckSpWp]: Trace formula consists of 289 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:18:47,472 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:48,731 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 95 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-23 17:18:48,731 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:18:48,731 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:18:48,732 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [208529700] [2021-11-23 17:18:48,732 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [208529700] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:18:48,732 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:18:48,732 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:18:48,732 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [581636185] [2021-11-23 17:18:48,732 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:18:48,732 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:18:48,732 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:18:48,733 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:18:48,733 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:18:48,733 INFO L87 Difference]: Start difference. First operand 5413 states and 7112 transitions. Second operand has 6 states, 6 states have (on average 21.0) internal successors, (126), 5 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:49,174 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:18:49,175 INFO L93 Difference]: Finished difference Result 7431 states and 9687 transitions. [2021-11-23 17:18:49,175 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:18:49,175 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 21.0) internal successors, (126), 5 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 136 [2021-11-23 17:18:49,176 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:18:49,182 INFO L225 Difference]: With dead ends: 7431 [2021-11-23 17:18:49,182 INFO L226 Difference]: Without dead ends: 6555 [2021-11-23 17:18:49,184 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 131 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:18:49,184 INFO L933 BasicCegarLoop]: 1541 mSDtfsCounter, 1514 mSDsluCounter, 3050 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1514 SdHoareTripleChecker+Valid, 4591 SdHoareTripleChecker+Invalid, 62 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 38 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:18:49,185 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1514 Valid, 4591 Invalid, 62 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 23 Invalid, 0 Unknown, 38 Unchecked, 0.0s Time] [2021-11-23 17:18:49,189 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6555 states. [2021-11-23 17:18:49,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6555 to 6537. [2021-11-23 17:18:49,585 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6537 states, 6535 states have (on average 1.3037490436113237) internal successors, (8520), 6536 states have internal predecessors, (8520), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:49,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6537 states to 6537 states and 8520 transitions. [2021-11-23 17:18:49,593 INFO L78 Accepts]: Start accepts. Automaton has 6537 states and 8520 transitions. Word has length 136 [2021-11-23 17:18:49,593 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:18:49,593 INFO L470 AbstractCegarLoop]: Abstraction has 6537 states and 8520 transitions. [2021-11-23 17:18:49,593 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 21.0) internal successors, (126), 5 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:49,594 INFO L276 IsEmpty]: Start isEmpty. Operand 6537 states and 8520 transitions. [2021-11-23 17:18:49,597 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2021-11-23 17:18:49,597 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:18:49,597 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:18:49,608 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (103)] Forceful destruction successful, exit code 0 [2021-11-23 17:18:49,801 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 103 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:18:49,802 INFO L402 AbstractCegarLoop]: === Iteration 52 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:18:49,802 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:18:49,802 INFO L85 PathProgramCache]: Analyzing trace with hash 1995068051, now seen corresponding path program 1 times [2021-11-23 17:18:49,803 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:18:49,803 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1448658943] [2021-11-23 17:18:49,803 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:49,803 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:18:49,803 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:18:49,804 INFO L229 MonitoredProcess]: Starting monitored process 104 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:18:49,805 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (104)] Waiting until timeout for monitored process [2021-11-23 17:18:49,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:49,915 INFO L263 TraceCheckSpWp]: Trace formula consists of 288 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:18:49,917 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:51,154 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 93 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-23 17:18:51,154 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:18:51,154 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:18:51,154 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1448658943] [2021-11-23 17:18:51,154 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1448658943] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:18:51,154 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:18:51,155 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:18:51,155 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [716755029] [2021-11-23 17:18:51,155 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:18:51,155 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:18:51,155 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:18:51,155 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:18:51,156 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:18:51,156 INFO L87 Difference]: Start difference. First operand 6537 states and 8520 transitions. Second operand has 6 states, 6 states have (on average 20.833333333333332) internal successors, (125), 5 states have internal predecessors, (125), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:51,759 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:18:51,759 INFO L93 Difference]: Finished difference Result 10252 states and 13308 transitions. [2021-11-23 17:18:51,760 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 17:18:51,760 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 20.833333333333332) internal successors, (125), 5 states have internal predecessors, (125), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 136 [2021-11-23 17:18:51,760 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:18:51,769 INFO L225 Difference]: With dead ends: 10252 [2021-11-23 17:18:51,769 INFO L226 Difference]: Without dead ends: 9047 [2021-11-23 17:18:51,771 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 131 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:18:51,772 INFO L933 BasicCegarLoop]: 1545 mSDtfsCounter, 2949 mSDsluCounter, 3069 mSDsCounter, 0 mSdLazyCounter, 2 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2949 SdHoareTripleChecker+Valid, 4614 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 2 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 47 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:18:51,772 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2949 Valid, 4614 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 2 Invalid, 0 Unknown, 47 Unchecked, 0.0s Time] [2021-11-23 17:18:51,778 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9047 states. [2021-11-23 17:18:52,344 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9047 to 9045. [2021-11-23 17:18:52,349 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9045 states, 9043 states have (on average 1.2914961848943936) internal successors, (11679), 9044 states have internal predecessors, (11679), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:52,360 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9045 states to 9045 states and 11679 transitions. [2021-11-23 17:18:52,361 INFO L78 Accepts]: Start accepts. Automaton has 9045 states and 11679 transitions. Word has length 136 [2021-11-23 17:18:52,361 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:18:52,361 INFO L470 AbstractCegarLoop]: Abstraction has 9045 states and 11679 transitions. [2021-11-23 17:18:52,361 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 20.833333333333332) internal successors, (125), 5 states have internal predecessors, (125), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:52,361 INFO L276 IsEmpty]: Start isEmpty. Operand 9045 states and 11679 transitions. [2021-11-23 17:18:52,365 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2021-11-23 17:18:52,365 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:18:52,365 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:18:52,376 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (104)] Forceful destruction successful, exit code 0 [2021-11-23 17:18:52,566 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 104 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:18:52,566 INFO L402 AbstractCegarLoop]: === Iteration 53 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:18:52,566 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:18:52,566 INFO L85 PathProgramCache]: Analyzing trace with hash 1086062995, now seen corresponding path program 1 times [2021-11-23 17:18:52,566 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:18:52,567 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1179898328] [2021-11-23 17:18:52,567 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:52,567 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:18:52,567 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:18:52,567 INFO L229 MonitoredProcess]: Starting monitored process 105 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:18:52,568 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (105)] Waiting until timeout for monitored process [2021-11-23 17:18:52,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:52,665 INFO L263 TraceCheckSpWp]: Trace formula consists of 288 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:18:52,666 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:54,846 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 78 proven. 22 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 17:18:54,846 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:18:55,969 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 78 proven. 22 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 17:18:55,970 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:18:55,970 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1179898328] [2021-11-23 17:18:55,970 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1179898328] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:18:55,970 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1813587438] [2021-11-23 17:18:55,970 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:55,970 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:18:55,970 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:18:55,971 INFO L229 MonitoredProcess]: Starting monitored process 106 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:18:55,975 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (106)] Waiting until timeout for monitored process [2021-11-23 17:18:56,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:56,137 INFO L263 TraceCheckSpWp]: Trace formula consists of 288 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:18:56,139 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:58,553 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 31 proven. 54 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 17:18:58,553 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:18:59,551 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 31 proven. 54 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 17:18:59,552 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1813587438] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:18:59,552 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1912163007] [2021-11-23 17:18:59,552 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:59,552 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:18:59,552 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:18:59,553 INFO L229 MonitoredProcess]: Starting monitored process 107 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:18:59,554 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (107)] Waiting until timeout for monitored process [2021-11-23 17:18:59,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:59,648 INFO L263 TraceCheckSpWp]: Trace formula consists of 288 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:18:59,650 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:19:01,760 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 31 proven. 54 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 17:19:01,760 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:19:02,503 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 31 proven. 54 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 17:19:02,503 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1912163007] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:19:02,504 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:19:02,504 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 8, 8, 8, 8] total 31 [2021-11-23 17:19:02,504 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [367485422] [2021-11-23 17:19:02,504 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:19:02,505 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-23 17:19:02,505 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:19:02,506 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-23 17:19:02,506 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=885, Unknown=0, NotChecked=0, Total=992 [2021-11-23 17:19:02,506 INFO L87 Difference]: Start difference. First operand 9045 states and 11679 transitions. Second operand has 32 states, 32 states have (on average 12.6875) internal successors, (406), 31 states have internal predecessors, (406), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:19:04,821 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:19:04,821 INFO L93 Difference]: Finished difference Result 13440 states and 17227 transitions. [2021-11-23 17:19:04,821 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-23 17:19:04,821 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 12.6875) internal successors, (406), 31 states have internal predecessors, (406), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 136 [2021-11-23 17:19:04,821 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:19:04,833 INFO L225 Difference]: With dead ends: 13440 [2021-11-23 17:19:04,833 INFO L226 Difference]: Without dead ends: 12227 [2021-11-23 17:19:04,836 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 835 GetRequests, 785 SyntacticMatches, 2 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 550 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=279, Invalid=2171, Unknown=0, NotChecked=0, Total=2450 [2021-11-23 17:19:04,836 INFO L933 BasicCegarLoop]: 1571 mSDtfsCounter, 8815 mSDsluCounter, 28227 mSDsCounter, 0 mSdLazyCounter, 86 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8815 SdHoareTripleChecker+Valid, 29798 SdHoareTripleChecker+Invalid, 356 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 86 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 265 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:19:04,836 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8815 Valid, 29798 Invalid, 356 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 86 Invalid, 0 Unknown, 265 Unchecked, 0.1s Time] [2021-11-23 17:19:04,845 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12227 states. [2021-11-23 17:19:05,678 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12227 to 12066. [2021-11-23 17:19:05,686 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12066 states, 12064 states have (on average 1.281996021220159) internal successors, (15466), 12065 states have internal predecessors, (15466), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:19:05,701 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12066 states to 12066 states and 15466 transitions. [2021-11-23 17:19:05,702 INFO L78 Accepts]: Start accepts. Automaton has 12066 states and 15466 transitions. Word has length 136 [2021-11-23 17:19:05,702 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:19:05,702 INFO L470 AbstractCegarLoop]: Abstraction has 12066 states and 15466 transitions. [2021-11-23 17:19:05,702 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 12.6875) internal successors, (406), 31 states have internal predecessors, (406), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:19:05,702 INFO L276 IsEmpty]: Start isEmpty. Operand 12066 states and 15466 transitions. [2021-11-23 17:19:05,706 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2021-11-23 17:19:05,706 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:19:05,706 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:19:05,717 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (105)] Forceful destruction successful, exit code 0 [2021-11-23 17:19:05,908 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (106)] Forceful destruction successful, exit code 0 [2021-11-23 17:19:06,130 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (107)] Forceful destruction successful, exit code 0 [2021-11-23 17:19:06,307 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 105 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,106 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,107 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:19:06,307 INFO L402 AbstractCegarLoop]: === Iteration 54 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:19:06,307 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:19:06,307 INFO L85 PathProgramCache]: Analyzing trace with hash -118950120, now seen corresponding path program 1 times [2021-11-23 17:19:06,308 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:19:06,308 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [349605675] [2021-11-23 17:19:06,308 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:19:06,308 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:19:06,308 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:19:06,309 INFO L229 MonitoredProcess]: Starting monitored process 108 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:19:06,310 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (108)] Waiting until timeout for monitored process [2021-11-23 17:19:06,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:19:06,406 INFO L263 TraceCheckSpWp]: Trace formula consists of 289 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:19:06,407 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:19:08,916 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 70 proven. 34 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:19:08,916 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:19:09,897 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 70 proven. 34 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:19:09,897 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:19:09,897 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [349605675] [2021-11-23 17:19:09,897 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [349605675] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:19:09,898 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [456801471] [2021-11-23 17:19:09,898 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:19:09,898 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:19:09,898 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:19:09,899 INFO L229 MonitoredProcess]: Starting monitored process 109 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:19:09,900 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (109)] Waiting until timeout for monitored process [2021-11-23 17:19:10,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:19:10,073 INFO L263 TraceCheckSpWp]: Trace formula consists of 289 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:19:10,074 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:19:12,588 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 39 proven. 52 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-23 17:19:12,589 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:19:13,537 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 39 proven. 52 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-23 17:19:13,537 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [456801471] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:19:13,538 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2106197845] [2021-11-23 17:19:13,538 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:19:13,538 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:19:13,538 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:19:13,539 INFO L229 MonitoredProcess]: Starting monitored process 110 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:19:13,540 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (110)] Waiting until timeout for monitored process [2021-11-23 17:19:13,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:19:13,626 INFO L263 TraceCheckSpWp]: Trace formula consists of 289 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:19:13,628 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:19:15,604 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 39 proven. 52 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-23 17:19:15,604 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:19:16,160 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 39 proven. 52 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-23 17:19:16,160 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2106197845] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:19:16,160 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:19:16,160 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 8, 8, 8, 8] total 31 [2021-11-23 17:19:16,161 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [420785783] [2021-11-23 17:19:16,161 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:19:16,161 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-23 17:19:16,161 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:19:16,162 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-23 17:19:16,162 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=885, Unknown=0, NotChecked=0, Total=992 [2021-11-23 17:19:16,162 INFO L87 Difference]: Start difference. First operand 12066 states and 15466 transitions. Second operand has 32 states, 32 states have (on average 13.1875) internal successors, (422), 31 states have internal predecessors, (422), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:19:19,049 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:19:19,049 INFO L93 Difference]: Finished difference Result 15006 states and 19210 transitions. [2021-11-23 17:19:19,049 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-11-23 17:19:19,050 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 13.1875) internal successors, (422), 31 states have internal predecessors, (422), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 136 [2021-11-23 17:19:19,050 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:19:19,065 INFO L225 Difference]: With dead ends: 15006 [2021-11-23 17:19:19,065 INFO L226 Difference]: Without dead ends: 14357 [2021-11-23 17:19:19,068 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 840 GetRequests, 789 SyntacticMatches, 2 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 561 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=309, Invalid=2241, Unknown=0, NotChecked=0, Total=2550 [2021-11-23 17:19:19,068 INFO L933 BasicCegarLoop]: 1576 mSDtfsCounter, 10347 mSDsluCounter, 25141 mSDsCounter, 0 mSdLazyCounter, 69 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10347 SdHoareTripleChecker+Valid, 26717 SdHoareTripleChecker+Invalid, 236 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 69 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 161 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:19:19,068 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10347 Valid, 26717 Invalid, 236 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 69 Invalid, 0 Unknown, 161 Unchecked, 0.1s Time] [2021-11-23 17:19:19,077 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14357 states. [2021-11-23 17:19:20,064 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14357 to 14248. [2021-11-23 17:19:20,074 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14248 states, 14246 states have (on average 1.2799382282746035) internal successors, (18234), 14247 states have internal predecessors, (18234), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:19:20,096 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14248 states to 14248 states and 18234 transitions. [2021-11-23 17:19:20,096 INFO L78 Accepts]: Start accepts. Automaton has 14248 states and 18234 transitions. Word has length 136 [2021-11-23 17:19:20,096 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:19:20,096 INFO L470 AbstractCegarLoop]: Abstraction has 14248 states and 18234 transitions. [2021-11-23 17:19:20,096 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 13.1875) internal successors, (422), 31 states have internal predecessors, (422), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:19:20,096 INFO L276 IsEmpty]: Start isEmpty. Operand 14248 states and 18234 transitions. [2021-11-23 17:19:20,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2021-11-23 17:19:20,102 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:19:20,102 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:19:20,113 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (108)] Forceful destruction successful, exit code 0 [2021-11-23 17:19:20,329 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_16dda382-a3ff-4a21-bbb2-dbf39a039c8f/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (110)] Ended with exit code 0