./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/seq-mthreaded/pals_opt-floodmax.3.2.ufo.UNBOUNDED.pals.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 47ea0209 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_addd8f9b-3b42-4ba4-a795-07527603e34d/bin/utaipan-UUZaoUuFF8/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_addd8f9b-3b42-4ba4-a795-07527603e34d/bin/utaipan-UUZaoUuFF8/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_addd8f9b-3b42-4ba4-a795-07527603e34d/bin/utaipan-UUZaoUuFF8/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_addd8f9b-3b42-4ba4-a795-07527603e34d/bin/utaipan-UUZaoUuFF8/config/TaipanReach.xml -i ../../sv-benchmarks/c/seq-mthreaded/pals_opt-floodmax.3.2.ufo.UNBOUNDED.pals.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_addd8f9b-3b42-4ba4-a795-07527603e34d/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_addd8f9b-3b42-4ba4-a795-07527603e34d/bin/utaipan-UUZaoUuFF8 --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 a10c9e6583b7bb9620d063f223dce3a6f04929588e6f4ac23db6236ec494c7b2 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-47ea020 [2021-11-07 01:22:17,348 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-07 01:22:17,351 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-07 01:22:17,405 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-07 01:22:17,406 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-07 01:22:17,407 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-07 01:22:17,409 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-07 01:22:17,411 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-07 01:22:17,413 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-07 01:22:17,415 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-07 01:22:17,416 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-07 01:22:17,417 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-07 01:22:17,418 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-07 01:22:17,419 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-07 01:22:17,421 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-07 01:22:17,423 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-07 01:22:17,424 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-07 01:22:17,425 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-07 01:22:17,428 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-07 01:22:17,430 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-07 01:22:17,432 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-07 01:22:17,440 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-07 01:22:17,441 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-07 01:22:17,442 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-07 01:22:17,446 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-07 01:22:17,447 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-07 01:22:17,447 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-07 01:22:17,449 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-07 01:22:17,449 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-07 01:22:17,450 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-07 01:22:17,451 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-07 01:22:17,458 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-07 01:22:17,460 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-07 01:22:17,462 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-07 01:22:17,463 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-07 01:22:17,464 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-07 01:22:17,465 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-07 01:22:17,465 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-07 01:22:17,465 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-07 01:22:17,466 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-07 01:22:17,467 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-07 01:22:17,468 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_addd8f9b-3b42-4ba4-a795-07527603e34d/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-07 01:22:17,521 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-07 01:22:17,521 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-07 01:22:17,523 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-07 01:22:17,523 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-07 01:22:17,524 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-07 01:22:17,524 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-07 01:22:17,524 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-07 01:22:17,524 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-07 01:22:17,530 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-07 01:22:17,531 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-07 01:22:17,532 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-07 01:22:17,532 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-07 01:22:17,532 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-07 01:22:17,533 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-07 01:22:17,533 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-07 01:22:17,534 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-07 01:22:17,534 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-07 01:22:17,534 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-07 01:22:17,534 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-07 01:22:17,534 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-07 01:22:17,535 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-07 01:22:17,535 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-07 01:22:17,535 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-07 01:22:17,535 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-07 01:22:17,535 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-07 01:22:17,536 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-07 01:22:17,536 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-07 01:22:17,536 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-07 01:22:17,536 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-07 01:22:17,538 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-07 01:22:17,538 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 01:22:17,538 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-07 01:22:17,539 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-07 01:22:17,539 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-07 01:22:17,539 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-07 01:22:17,539 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-07 01:22:17,540 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-07 01:22:17,540 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-07 01:22:17,540 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-07 01:22:17,540 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_addd8f9b-3b42-4ba4-a795-07527603e34d/bin/utaipan-UUZaoUuFF8/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_addd8f9b-3b42-4ba4-a795-07527603e34d/bin/utaipan-UUZaoUuFF8 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> a10c9e6583b7bb9620d063f223dce3a6f04929588e6f4ac23db6236ec494c7b2 [2021-11-07 01:22:17,850 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-07 01:22:17,877 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-07 01:22:17,880 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-07 01:22:17,881 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-07 01:22:17,882 INFO L275 PluginConnector]: CDTParser initialized [2021-11-07 01:22:17,883 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_addd8f9b-3b42-4ba4-a795-07527603e34d/bin/utaipan-UUZaoUuFF8/../../sv-benchmarks/c/seq-mthreaded/pals_opt-floodmax.3.2.ufo.UNBOUNDED.pals.c [2021-11-07 01:22:17,955 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_addd8f9b-3b42-4ba4-a795-07527603e34d/bin/utaipan-UUZaoUuFF8/data/c542af912/8ca7970af0624df6b843350aa57e057d/FLAG18fcde531 [2021-11-07 01:22:18,463 INFO L306 CDTParser]: Found 1 translation units. [2021-11-07 01:22:18,464 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_addd8f9b-3b42-4ba4-a795-07527603e34d/sv-benchmarks/c/seq-mthreaded/pals_opt-floodmax.3.2.ufo.UNBOUNDED.pals.c [2021-11-07 01:22:18,485 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_addd8f9b-3b42-4ba4-a795-07527603e34d/bin/utaipan-UUZaoUuFF8/data/c542af912/8ca7970af0624df6b843350aa57e057d/FLAG18fcde531 [2021-11-07 01:22:18,793 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_addd8f9b-3b42-4ba4-a795-07527603e34d/bin/utaipan-UUZaoUuFF8/data/c542af912/8ca7970af0624df6b843350aa57e057d [2021-11-07 01:22:18,796 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-07 01:22:18,797 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-07 01:22:18,799 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-07 01:22:18,799 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-07 01:22:18,802 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-07 01:22:18,803 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:22:18" (1/1) ... [2021-11-07 01:22:18,804 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4cf91dda and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:22:18, skipping insertion in model container [2021-11-07 01:22:18,804 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:22:18" (1/1) ... [2021-11-07 01:22:18,811 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-07 01:22:18,853 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 01:22:19,102 WARN L228 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_addd8f9b-3b42-4ba4-a795-07527603e34d/sv-benchmarks/c/seq-mthreaded/pals_opt-floodmax.3.2.ufo.UNBOUNDED.pals.c[14521,14534] [2021-11-07 01:22:19,105 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 01:22:19,116 INFO L203 MainTranslator]: Completed pre-run [2021-11-07 01:22:19,175 WARN L228 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_addd8f9b-3b42-4ba4-a795-07527603e34d/sv-benchmarks/c/seq-mthreaded/pals_opt-floodmax.3.2.ufo.UNBOUNDED.pals.c[14521,14534] [2021-11-07 01:22:19,175 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 01:22:19,191 INFO L208 MainTranslator]: Completed translation [2021-11-07 01:22:19,192 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:22:19 WrapperNode [2021-11-07 01:22:19,192 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-07 01:22:19,193 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-07 01:22:19,193 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-07 01:22:19,194 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-07 01:22:19,201 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:22:19" (1/1) ... [2021-11-07 01:22:19,213 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:22:19" (1/1) ... [2021-11-07 01:22:19,266 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-07 01:22:19,267 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-07 01:22:19,267 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-07 01:22:19,267 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-07 01:22:19,276 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:22:19" (1/1) ... [2021-11-07 01:22:19,277 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:22:19" (1/1) ... [2021-11-07 01:22:19,281 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:22:19" (1/1) ... [2021-11-07 01:22:19,282 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:22:19" (1/1) ... [2021-11-07 01:22:19,293 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:22:19" (1/1) ... [2021-11-07 01:22:19,302 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:22:19" (1/1) ... [2021-11-07 01:22:19,305 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:22:19" (1/1) ... [2021-11-07 01:22:19,311 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-07 01:22:19,312 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-07 01:22:19,312 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-07 01:22:19,313 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-07 01:22:19,314 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:22:19" (1/1) ... [2021-11-07 01:22:19,343 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 01:22:19,360 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_addd8f9b-3b42-4ba4-a795-07527603e34d/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:22:19,381 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_addd8f9b-3b42-4ba4-a795-07527603e34d/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-07 01:22:19,412 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_addd8f9b-3b42-4ba4-a795-07527603e34d/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-07 01:22:19,430 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-07 01:22:19,431 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-07 01:22:19,433 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-07 01:22:19,433 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-07 01:22:22,228 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-07 01:22:22,229 INFO L299 CfgBuilder]: Removed 19 assume(true) statements. [2021-11-07 01:22:22,231 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:22:22 BoogieIcfgContainer [2021-11-07 01:22:22,232 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-07 01:22:22,233 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-07 01:22:22,234 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-07 01:22:22,237 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-07 01:22:22,238 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 01:22:18" (1/3) ... [2021-11-07 01:22:22,239 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@466d9ae0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:22:22, skipping insertion in model container [2021-11-07 01:22:22,239 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:22:19" (2/3) ... [2021-11-07 01:22:22,240 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@466d9ae0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:22:22, skipping insertion in model container [2021-11-07 01:22:22,240 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:22:22" (3/3) ... [2021-11-07 01:22:22,244 INFO L111 eAbstractionObserver]: Analyzing ICFG pals_opt-floodmax.3.2.ufo.UNBOUNDED.pals.c [2021-11-07 01:22:22,249 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-07 01:22:22,250 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-07 01:22:22,308 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-07 01:22:22,317 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 [2021-11-07 01:22:22,317 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-07 01:22:22,333 INFO L276 IsEmpty]: Start isEmpty. Operand has 18 states, 16 states have (on average 1.8125) internal successors, (29), 17 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:22:22,338 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-07 01:22:22,339 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:22:22,340 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-07 01:22:22,340 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:22:22,351 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:22:22,352 INFO L85 PathProgramCache]: Analyzing trace with hash -2022557890, now seen corresponding path program 1 times [2021-11-07 01:22:22,369 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:22:22,369 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [505681928] [2021-11-07 01:22:22,370 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:22:22,371 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:22:22,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:22:23,237 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:22:23,237 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:22:23,238 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [505681928] [2021-11-07 01:22:23,238 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [505681928] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:22:23,239 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:22:23,239 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 01:22:23,241 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1223255220] [2021-11-07 01:22:23,246 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 01:22:23,246 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:22:23,261 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 01:22:23,262 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:22:23,265 INFO L87 Difference]: Start difference. First operand has 18 states, 16 states have (on average 1.8125) internal successors, (29), 17 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:22:23,385 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:22:23,385 INFO L93 Difference]: Finished difference Result 51 states and 87 transitions. [2021-11-07 01:22:23,386 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 01:22:23,387 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 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 6 [2021-11-07 01:22:23,388 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:22:23,397 INFO L225 Difference]: With dead ends: 51 [2021-11-07 01:22:23,397 INFO L226 Difference]: Without dead ends: 34 [2021-11-07 01:22:23,401 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:22:23,416 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-11-07 01:22:23,429 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 25. [2021-11-07 01:22:23,431 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 24 states have (on average 1.6666666666666667) internal successors, (40), 24 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:22:23,432 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 40 transitions. [2021-11-07 01:22:23,433 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 40 transitions. Word has length 6 [2021-11-07 01:22:23,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:22:23,434 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 40 transitions. [2021-11-07 01:22:23,434 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:22:23,434 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 40 transitions. [2021-11-07 01:22:23,435 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-07 01:22:23,435 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:22:23,435 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:22:23,436 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-07 01:22:23,436 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:22:23,437 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:22:23,437 INFO L85 PathProgramCache]: Analyzing trace with hash 1662609203, now seen corresponding path program 1 times [2021-11-07 01:22:23,437 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:22:23,438 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1638881486] [2021-11-07 01:22:23,438 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:22:23,438 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:22:23,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:22:23,844 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:22:23,845 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:22:23,845 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1638881486] [2021-11-07 01:22:23,846 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1638881486] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:22:23,846 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:22:23,846 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 01:22:23,847 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1656292598] [2021-11-07 01:22:23,848 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 01:22:23,849 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:22:23,850 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 01:22:23,850 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:22:23,851 INFO L87 Difference]: Start difference. First operand 25 states and 40 transitions. Second operand has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:22:23,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:22:23,951 INFO L93 Difference]: Finished difference Result 54 states and 84 transitions. [2021-11-07 01:22:23,952 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 01:22:23,952 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2021-11-07 01:22:23,952 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:22:23,953 INFO L225 Difference]: With dead ends: 54 [2021-11-07 01:22:23,953 INFO L226 Difference]: Without dead ends: 36 [2021-11-07 01:22:23,954 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:22:23,954 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-11-07 01:22:23,958 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 25. [2021-11-07 01:22:23,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 24 states have (on average 1.625) internal successors, (39), 24 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:22:23,962 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 39 transitions. [2021-11-07 01:22:23,963 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 39 transitions. Word has length 7 [2021-11-07 01:22:23,963 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:22:23,964 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 39 transitions. [2021-11-07 01:22:23,964 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:22:23,965 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 39 transitions. [2021-11-07 01:22:23,965 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-07 01:22:23,966 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:22:23,966 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:22:23,966 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-07 01:22:23,966 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:22:23,976 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:22:23,976 INFO L85 PathProgramCache]: Analyzing trace with hash -55876153, now seen corresponding path program 1 times [2021-11-07 01:22:23,977 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:22:23,977 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [414116321] [2021-11-07 01:22:23,977 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:22:23,977 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:22:24,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:22:24,260 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:22:24,261 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:22:24,261 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [414116321] [2021-11-07 01:22:24,262 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [414116321] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:22:24,262 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:22:24,268 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 01:22:24,269 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [406908313] [2021-11-07 01:22:24,269 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 01:22:24,269 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:22:24,271 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 01:22:24,271 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:22:24,271 INFO L87 Difference]: Start difference. First operand 25 states and 39 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:22:24,390 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:22:24,390 INFO L93 Difference]: Finished difference Result 54 states and 83 transitions. [2021-11-07 01:22:24,391 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 01:22:24,391 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-11-07 01:22:24,392 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:22:24,392 INFO L225 Difference]: With dead ends: 54 [2021-11-07 01:22:24,393 INFO L226 Difference]: Without dead ends: 36 [2021-11-07 01:22:24,393 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:22:24,393 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-11-07 01:22:24,402 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 25. [2021-11-07 01:22:24,403 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 24 states have (on average 1.5833333333333333) internal successors, (38), 24 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:22:24,404 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 38 transitions. [2021-11-07 01:22:24,404 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 38 transitions. Word has length 8 [2021-11-07 01:22:24,404 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:22:24,404 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 38 transitions. [2021-11-07 01:22:24,404 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:22:24,404 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 38 transitions. [2021-11-07 01:22:24,405 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-07 01:22:24,405 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:22:24,405 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:22:24,405 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-07 01:22:24,406 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:22:24,406 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:22:24,406 INFO L85 PathProgramCache]: Analyzing trace with hash -1783862884, now seen corresponding path program 1 times [2021-11-07 01:22:24,406 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:22:24,407 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [884245890] [2021-11-07 01:22:24,407 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:22:24,407 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:22:24,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:22:24,724 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:22:24,725 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:22:24,725 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [884245890] [2021-11-07 01:22:24,728 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [884245890] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:22:24,728 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:22:24,728 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 01:22:24,729 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2000238934] [2021-11-07 01:22:24,729 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 01:22:24,729 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:22:24,730 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 01:22:24,730 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:22:24,730 INFO L87 Difference]: Start difference. First operand 25 states and 38 transitions. Second operand has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:22:24,825 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:22:24,825 INFO L93 Difference]: Finished difference Result 54 states and 82 transitions. [2021-11-07 01:22:24,825 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 01:22:24,826 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2021-11-07 01:22:24,826 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:22:24,827 INFO L225 Difference]: With dead ends: 54 [2021-11-07 01:22:24,827 INFO L226 Difference]: Without dead ends: 36 [2021-11-07 01:22:24,829 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:22:24,830 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-11-07 01:22:24,835 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 25. [2021-11-07 01:22:24,835 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 24 states have (on average 1.5416666666666667) internal successors, (37), 24 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:22:24,836 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 37 transitions. [2021-11-07 01:22:24,836 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 37 transitions. Word has length 9 [2021-11-07 01:22:24,836 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:22:24,836 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 37 transitions. [2021-11-07 01:22:24,836 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:22:24,836 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 37 transitions. [2021-11-07 01:22:24,837 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-07 01:22:24,837 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:22:24,837 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:22:24,837 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-07 01:22:24,837 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:22:24,838 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:22:24,838 INFO L85 PathProgramCache]: Analyzing trace with hash -2072904668, now seen corresponding path program 1 times [2021-11-07 01:22:24,838 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:22:24,838 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [324106961] [2021-11-07 01:22:24,839 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:22:24,839 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:22:25,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:22:25,147 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:22:25,147 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:22:25,147 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [324106961] [2021-11-07 01:22:25,148 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [324106961] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:22:25,148 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:22:25,148 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 01:22:25,148 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [611500733] [2021-11-07 01:22:25,148 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 01:22:25,149 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:22:25,149 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 01:22:25,149 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:22:25,150 INFO L87 Difference]: Start difference. First operand 25 states and 37 transitions. Second operand has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:22:25,227 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:22:25,227 INFO L93 Difference]: Finished difference Result 52 states and 78 transitions. [2021-11-07 01:22:25,228 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 01:22:25,228 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-11-07 01:22:25,228 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:22:25,231 INFO L225 Difference]: With dead ends: 52 [2021-11-07 01:22:25,231 INFO L226 Difference]: Without dead ends: 34 [2021-11-07 01:22:25,231 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:22:25,232 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-11-07 01:22:25,241 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 26. [2021-11-07 01:22:25,242 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 25 states have (on average 1.52) internal successors, (38), 25 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:22:25,243 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 38 transitions. [2021-11-07 01:22:25,244 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 38 transitions. Word has length 11 [2021-11-07 01:22:25,244 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:22:25,244 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 38 transitions. [2021-11-07 01:22:25,244 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:22:25,245 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 38 transitions. [2021-11-07 01:22:25,245 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-07 01:22:25,245 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:22:25,246 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:22:25,246 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-07 01:22:25,246 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:22:25,247 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:22:25,247 INFO L85 PathProgramCache]: Analyzing trace with hash 76566526, now seen corresponding path program 1 times [2021-11-07 01:22:25,248 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:22:25,248 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1705967258] [2021-11-07 01:22:25,248 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:22:25,248 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:22:25,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:22:25,509 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:22:25,512 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:22:25,512 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1705967258] [2021-11-07 01:22:25,513 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1705967258] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:22:25,513 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:22:25,513 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 01:22:25,513 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1927402289] [2021-11-07 01:22:25,514 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 01:22:25,514 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:22:25,516 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 01:22:25,516 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:22:25,517 INFO L87 Difference]: Start difference. First operand 26 states and 38 transitions. Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:22:25,581 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:22:25,582 INFO L93 Difference]: Finished difference Result 53 states and 79 transitions. [2021-11-07 01:22:25,582 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 01:22:25,582 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-11-07 01:22:25,583 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:22:25,583 INFO L225 Difference]: With dead ends: 53 [2021-11-07 01:22:25,584 INFO L226 Difference]: Without dead ends: 35 [2021-11-07 01:22:25,585 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:22:25,585 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-11-07 01:22:25,593 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 28. [2021-11-07 01:22:25,595 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 27 states have (on average 1.4444444444444444) internal successors, (39), 27 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:22:25,596 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 39 transitions. [2021-11-07 01:22:25,596 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 39 transitions. Word has length 12 [2021-11-07 01:22:25,597 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:22:25,597 INFO L470 AbstractCegarLoop]: Abstraction has 28 states and 39 transitions. [2021-11-07 01:22:25,597 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:22:25,597 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 39 transitions. [2021-11-07 01:22:25,598 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-07 01:22:25,598 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:22:25,598 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:22:25,599 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-07 01:22:25,599 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:22:25,599 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:22:25,599 INFO L85 PathProgramCache]: Analyzing trace with hash 2080698436, now seen corresponding path program 1 times [2021-11-07 01:22:25,600 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:22:25,603 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [811108381] [2021-11-07 01:22:25,603 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:22:25,604 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:22:25,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:22:25,834 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:22:25,834 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:22:25,834 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [811108381] [2021-11-07 01:22:25,834 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [811108381] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:22:25,834 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:22:25,834 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 01:22:25,835 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1544045493] [2021-11-07 01:22:25,835 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 01:22:25,835 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:22:25,836 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 01:22:25,836 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:22:25,836 INFO L87 Difference]: Start difference. First operand 28 states and 39 transitions. Second operand has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:22:25,899 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:22:25,899 INFO L93 Difference]: Finished difference Result 53 states and 76 transitions. [2021-11-07 01:22:25,900 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 01:22:25,900 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2021-11-07 01:22:25,900 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:22:25,900 INFO L225 Difference]: With dead ends: 53 [2021-11-07 01:22:25,901 INFO L226 Difference]: Without dead ends: 35 [2021-11-07 01:22:25,901 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:22:25,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-11-07 01:22:25,904 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 29. [2021-11-07 01:22:25,905 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 28 states have (on average 1.4285714285714286) internal successors, (40), 28 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:22:25,905 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 40 transitions. [2021-11-07 01:22:25,905 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 40 transitions. Word has length 14 [2021-11-07 01:22:25,905 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:22:25,906 INFO L470 AbstractCegarLoop]: Abstraction has 29 states and 40 transitions. [2021-11-07 01:22:25,906 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:22:25,906 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 40 transitions. [2021-11-07 01:22:25,906 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-07 01:22:25,906 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:22:25,907 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:22:25,907 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-07 01:22:25,907 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:22:25,907 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:22:25,907 INFO L85 PathProgramCache]: Analyzing trace with hash 66551515, now seen corresponding path program 1 times [2021-11-07 01:22:25,908 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:22:25,908 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1533456440] [2021-11-07 01:22:25,908 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:22:25,908 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:22:25,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:22:25,990 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:22:25,990 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:22:25,991 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1533456440] [2021-11-07 01:22:25,991 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1533456440] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:22:25,991 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:22:25,991 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-07 01:22:25,991 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1280843459] [2021-11-07 01:22:25,992 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-07 01:22:25,992 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:22:25,992 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-07 01:22:25,992 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-07 01:22:25,993 INFO L87 Difference]: Start difference. First operand 29 states and 40 transitions. Second operand has 5 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:22:26,136 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:22:26,136 INFO L93 Difference]: Finished difference Result 73 states and 109 transitions. [2021-11-07 01:22:26,136 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-07 01:22:26,137 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2021-11-07 01:22:26,137 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:22:26,137 INFO L225 Difference]: With dead ends: 73 [2021-11-07 01:22:26,138 INFO L226 Difference]: Without dead ends: 55 [2021-11-07 01:22:26,138 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-11-07 01:22:26,138 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-11-07 01:22:26,142 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 32. [2021-11-07 01:22:26,142 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 31 states have (on average 1.3548387096774193) internal successors, (42), 31 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:22:26,143 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 42 transitions. [2021-11-07 01:22:26,143 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 42 transitions. Word has length 15 [2021-11-07 01:22:26,143 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:22:26,143 INFO L470 AbstractCegarLoop]: Abstraction has 32 states and 42 transitions. [2021-11-07 01:22:26,144 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:22:26,144 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 42 transitions. [2021-11-07 01:22:26,144 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-07 01:22:26,144 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:22:26,145 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:22:26,145 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-07 01:22:26,145 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:22:26,145 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:22:26,145 INFO L85 PathProgramCache]: Analyzing trace with hash 1068873569, now seen corresponding path program 1 times [2021-11-07 01:22:26,146 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:22:26,146 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [447675178] [2021-11-07 01:22:26,146 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:22:26,146 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:22:26,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:22:27,079 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:22:27,080 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:22:27,080 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [447675178] [2021-11-07 01:22:27,080 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [447675178] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 01:22:27,081 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [835517761] [2021-11-07 01:22:27,084 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:22:27,085 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:22:27,085 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_addd8f9b-3b42-4ba4-a795-07527603e34d/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:22:27,087 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_addd8f9b-3b42-4ba4-a795-07527603e34d/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:22:27,119 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_addd8f9b-3b42-4ba4-a795-07527603e34d/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-07 01:22:27,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:22:27,275 INFO L263 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 39 conjunts are in the unsatisfiable core [2021-11-07 01:22:27,290 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:22:46,860 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:22:46,860 INFO L328 TraceCheckSpWp]: Computing backward predicates...