./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/seq-mthreaded/pals_floodmax.3.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_7e8051b9-ccc5-480c-9aed-3c65e0bebd15/bin/utaipan-UUZaoUuFF8/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7e8051b9-ccc5-480c-9aed-3c65e0bebd15/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_7e8051b9-ccc5-480c-9aed-3c65e0bebd15/bin/utaipan-UUZaoUuFF8/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7e8051b9-ccc5-480c-9aed-3c65e0bebd15/bin/utaipan-UUZaoUuFF8/config/TaipanReach.xml -i ../../sv-benchmarks/c/seq-mthreaded/pals_floodmax.3.ufo.UNBOUNDED.pals.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7e8051b9-ccc5-480c-9aed-3c65e0bebd15/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_7e8051b9-ccc5-480c-9aed-3c65e0bebd15/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 0490559c2bf039cbe49bd5644a18ada08843fe5179dc7b178541a9c54e014b6c --- Real Ultimate output --- This is Ultimate 0.2.1-dev-47ea020 [2021-11-07 02:17:23,523 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-07 02:17:23,526 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-07 02:17:23,571 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-07 02:17:23,571 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-07 02:17:23,573 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-07 02:17:23,575 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-07 02:17:23,577 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-07 02:17:23,579 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-07 02:17:23,580 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-07 02:17:23,582 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-07 02:17:23,583 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-07 02:17:23,584 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-07 02:17:23,585 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-07 02:17:23,587 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-07 02:17:23,588 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-07 02:17:23,589 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-07 02:17:23,591 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-07 02:17:23,593 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-07 02:17:23,595 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-07 02:17:23,598 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-07 02:17:23,600 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-07 02:17:23,602 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-07 02:17:23,603 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-07 02:17:23,607 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-07 02:17:23,608 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-07 02:17:23,609 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-07 02:17:23,610 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-07 02:17:23,610 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-07 02:17:23,612 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-07 02:17:23,612 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-07 02:17:23,617 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-07 02:17:23,619 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-07 02:17:23,621 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-07 02:17:23,623 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-07 02:17:23,623 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-07 02:17:23,624 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-07 02:17:23,625 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-07 02:17:23,625 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-07 02:17:23,626 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-07 02:17:23,627 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-07 02:17:23,628 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7e8051b9-ccc5-480c-9aed-3c65e0bebd15/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-07 02:17:23,681 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-07 02:17:23,681 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-07 02:17:23,682 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-07 02:17:23,683 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-07 02:17:23,683 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-07 02:17:23,683 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-07 02:17:23,683 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-07 02:17:23,684 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-07 02:17:23,690 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-07 02:17:23,690 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-07 02:17:23,692 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-07 02:17:23,692 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-07 02:17:23,692 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-07 02:17:23,692 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-07 02:17:23,693 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-07 02:17:23,693 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-07 02:17:23,694 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-07 02:17:23,694 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-07 02:17:23,694 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-07 02:17:23,694 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-07 02:17:23,695 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-07 02:17:23,695 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-07 02:17:23,695 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-07 02:17:23,695 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-07 02:17:23,695 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-07 02:17:23,696 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-07 02:17:23,696 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-07 02:17:23,696 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-07 02:17:23,696 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-07 02:17:23,699 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-07 02:17:23,699 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 02:17:23,699 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-07 02:17:23,700 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-07 02:17:23,700 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-07 02:17:23,700 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-07 02:17:23,700 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-07 02:17:23,701 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-07 02:17:23,701 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-07 02:17:23,701 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-07 02:17:23,701 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_7e8051b9-ccc5-480c-9aed-3c65e0bebd15/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7e8051b9-ccc5-480c-9aed-3c65e0bebd15/bin/utaipan-UUZaoUuFF8 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 0490559c2bf039cbe49bd5644a18ada08843fe5179dc7b178541a9c54e014b6c [2021-11-07 02:17:24,002 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-07 02:17:24,027 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-07 02:17:24,030 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-07 02:17:24,032 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-07 02:17:24,033 INFO L275 PluginConnector]: CDTParser initialized [2021-11-07 02:17:24,034 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7e8051b9-ccc5-480c-9aed-3c65e0bebd15/bin/utaipan-UUZaoUuFF8/../../sv-benchmarks/c/seq-mthreaded/pals_floodmax.3.ufo.UNBOUNDED.pals.c [2021-11-07 02:17:24,111 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7e8051b9-ccc5-480c-9aed-3c65e0bebd15/bin/utaipan-UUZaoUuFF8/data/36bddd743/843b6a73229340e8bae847c44cf3d030/FLAG83e6cbaab [2021-11-07 02:17:24,703 INFO L306 CDTParser]: Found 1 translation units. [2021-11-07 02:17:24,704 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7e8051b9-ccc5-480c-9aed-3c65e0bebd15/sv-benchmarks/c/seq-mthreaded/pals_floodmax.3.ufo.UNBOUNDED.pals.c [2021-11-07 02:17:24,715 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7e8051b9-ccc5-480c-9aed-3c65e0bebd15/bin/utaipan-UUZaoUuFF8/data/36bddd743/843b6a73229340e8bae847c44cf3d030/FLAG83e6cbaab [2021-11-07 02:17:25,004 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7e8051b9-ccc5-480c-9aed-3c65e0bebd15/bin/utaipan-UUZaoUuFF8/data/36bddd743/843b6a73229340e8bae847c44cf3d030 [2021-11-07 02:17:25,007 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-07 02:17:25,009 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-07 02:17:25,012 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-07 02:17:25,013 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-07 02:17:25,017 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-07 02:17:25,017 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 02:17:25" (1/1) ... [2021-11-07 02:17:25,020 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@39cbab5f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:17:25, skipping insertion in model container [2021-11-07 02:17:25,020 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 02:17:25" (1/1) ... [2021-11-07 02:17:25,026 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-07 02:17:25,074 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 02:17:25,367 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_7e8051b9-ccc5-480c-9aed-3c65e0bebd15/sv-benchmarks/c/seq-mthreaded/pals_floodmax.3.ufo.UNBOUNDED.pals.c[12966,12979] [2021-11-07 02:17:25,370 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 02:17:25,381 INFO L203 MainTranslator]: Completed pre-run [2021-11-07 02:17:25,473 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_7e8051b9-ccc5-480c-9aed-3c65e0bebd15/sv-benchmarks/c/seq-mthreaded/pals_floodmax.3.ufo.UNBOUNDED.pals.c[12966,12979] [2021-11-07 02:17:25,474 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 02:17:25,496 INFO L208 MainTranslator]: Completed translation [2021-11-07 02:17:25,507 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:17:25 WrapperNode [2021-11-07 02:17:25,508 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-07 02:17:25,509 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-07 02:17:25,509 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-07 02:17:25,509 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-07 02:17:25,524 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:17:25" (1/1) ... [2021-11-07 02:17:25,534 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:17:25" (1/1) ... [2021-11-07 02:17:25,581 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-07 02:17:25,582 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-07 02:17:25,582 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-07 02:17:25,582 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-07 02:17:25,598 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:17:25" (1/1) ... [2021-11-07 02:17:25,598 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:17:25" (1/1) ... [2021-11-07 02:17:25,611 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:17:25" (1/1) ... [2021-11-07 02:17:25,611 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:17:25" (1/1) ... [2021-11-07 02:17:25,624 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:17:25" (1/1) ... [2021-11-07 02:17:25,643 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:17:25" (1/1) ... [2021-11-07 02:17:25,647 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:17:25" (1/1) ... [2021-11-07 02:17:25,657 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-07 02:17:25,659 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-07 02:17:25,659 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-07 02:17:25,659 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-07 02:17:25,660 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:17:25" (1/1) ... [2021-11-07 02:17:25,676 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 02:17:25,692 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7e8051b9-ccc5-480c-9aed-3c65e0bebd15/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 02:17:25,706 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7e8051b9-ccc5-480c-9aed-3c65e0bebd15/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-07 02:17:25,728 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7e8051b9-ccc5-480c-9aed-3c65e0bebd15/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-07 02:17:25,765 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-07 02:17:25,765 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-07 02:17:25,767 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-07 02:17:25,767 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-07 02:17:28,598 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-07 02:17:28,598 INFO L299 CfgBuilder]: Removed 19 assume(true) statements. [2021-11-07 02:17:28,601 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 02:17:28 BoogieIcfgContainer [2021-11-07 02:17:28,601 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-07 02:17:28,604 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-07 02:17:28,605 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-07 02:17:28,608 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-07 02:17:28,608 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 02:17:25" (1/3) ... [2021-11-07 02:17:28,609 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@65de841b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 02:17:28, skipping insertion in model container [2021-11-07 02:17:28,610 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:17:25" (2/3) ... [2021-11-07 02:17:28,610 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@65de841b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 02:17:28, skipping insertion in model container [2021-11-07 02:17:28,610 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 02:17:28" (3/3) ... [2021-11-07 02:17:28,613 INFO L111 eAbstractionObserver]: Analyzing ICFG pals_floodmax.3.ufo.UNBOUNDED.pals.c [2021-11-07 02:17:28,619 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-07 02:17:28,619 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-07 02:17:28,686 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-07 02:17:28,695 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 02:17:28,695 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-07 02:17:28,711 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 02:17:28,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-07 02:17:28,727 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:17:28,728 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-07 02:17:28,729 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:17:28,734 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:17:28,734 INFO L85 PathProgramCache]: Analyzing trace with hash 641061, now seen corresponding path program 1 times [2021-11-07 02:17:28,750 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 02:17:28,751 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2121021796] [2021-11-07 02:17:28,751 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:17:28,752 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 02:17:29,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:17:29,689 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 02:17:29,689 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 02:17:29,690 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2121021796] [2021-11-07 02:17:29,691 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2121021796] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 02:17:29,691 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:17:29,691 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 02:17:29,693 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1312675696] [2021-11-07 02:17:29,697 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 02:17:29,698 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 02:17:29,713 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 02:17:29,714 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 02:17:29,716 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 02:17:29,826 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:17:29,827 INFO L93 Difference]: Finished difference Result 51 states and 87 transitions. [2021-11-07 02:17:29,827 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 02:17:29,828 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 02:17:29,829 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:17:29,839 INFO L225 Difference]: With dead ends: 51 [2021-11-07 02:17:29,839 INFO L226 Difference]: Without dead ends: 34 [2021-11-07 02:17:29,843 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 02:17:29,858 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-11-07 02:17:29,875 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 25. [2021-11-07 02:17:29,877 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 02:17:29,880 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 40 transitions. [2021-11-07 02:17:29,881 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 40 transitions. Word has length 6 [2021-11-07 02:17:29,882 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:17:29,882 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 40 transitions. [2021-11-07 02:17:29,883 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 02:17:29,883 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 40 transitions. [2021-11-07 02:17:29,884 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-07 02:17:29,884 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:17:29,884 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:17:29,884 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-07 02:17:29,884 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:17:29,887 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:17:29,887 INFO L85 PathProgramCache]: Analyzing trace with hash -42761643, now seen corresponding path program 1 times [2021-11-07 02:17:29,888 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 02:17:29,888 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2141669197] [2021-11-07 02:17:29,888 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:17:29,888 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 02:17:30,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:17:30,245 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 02:17:30,245 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 02:17:30,246 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2141669197] [2021-11-07 02:17:30,246 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2141669197] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 02:17:30,246 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:17:30,246 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 02:17:30,247 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [89527288] [2021-11-07 02:17:30,248 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 02:17:30,248 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 02:17:30,249 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 02:17:30,249 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 02:17:30,250 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 02:17:30,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:17:30,336 INFO L93 Difference]: Finished difference Result 54 states and 84 transitions. [2021-11-07 02:17:30,337 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 02:17:30,338 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 02:17:30,338 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:17:30,339 INFO L225 Difference]: With dead ends: 54 [2021-11-07 02:17:30,339 INFO L226 Difference]: Without dead ends: 36 [2021-11-07 02:17:30,340 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 02:17:30,341 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-11-07 02:17:30,347 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 25. [2021-11-07 02:17:30,348 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 02:17:30,350 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 39 transitions. [2021-11-07 02:17:30,351 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 39 transitions. Word has length 7 [2021-11-07 02:17:30,351 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:17:30,351 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 39 transitions. [2021-11-07 02:17:30,352 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 02:17:30,352 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 39 transitions. [2021-11-07 02:17:30,353 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-07 02:17:30,353 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:17:30,353 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:17:30,353 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-07 02:17:30,354 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:17:30,363 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:17:30,364 INFO L85 PathProgramCache]: Analyzing trace with hash -1382793714, now seen corresponding path program 1 times [2021-11-07 02:17:30,365 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 02:17:30,366 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1149117397] [2021-11-07 02:17:30,366 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:17:30,367 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 02:17:30,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:17:30,649 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 02:17:30,650 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 02:17:30,650 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1149117397] [2021-11-07 02:17:30,651 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1149117397] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 02:17:30,651 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:17:30,657 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 02:17:30,658 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [564628311] [2021-11-07 02:17:30,658 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 02:17:30,659 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 02:17:30,660 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 02:17:30,660 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 02:17:30,660 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 02:17:30,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:17:30,757 INFO L93 Difference]: Finished difference Result 54 states and 83 transitions. [2021-11-07 02:17:30,758 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 02:17:30,758 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 02:17:30,758 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:17:30,761 INFO L225 Difference]: With dead ends: 54 [2021-11-07 02:17:30,762 INFO L226 Difference]: Without dead ends: 36 [2021-11-07 02:17:30,762 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 02:17:30,763 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-11-07 02:17:30,768 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 25. [2021-11-07 02:17:30,769 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 02:17:30,770 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 38 transitions. [2021-11-07 02:17:30,770 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 38 transitions. Word has length 8 [2021-11-07 02:17:30,770 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:17:30,771 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 38 transitions. [2021-11-07 02:17:30,771 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 02:17:30,771 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 38 transitions. [2021-11-07 02:17:30,772 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-07 02:17:30,772 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:17:30,772 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:17:30,772 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-07 02:17:30,773 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:17:30,773 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:17:30,773 INFO L85 PathProgramCache]: Analyzing trace with hash 31336798, now seen corresponding path program 1 times [2021-11-07 02:17:30,774 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 02:17:30,774 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1387995920] [2021-11-07 02:17:30,775 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:17:30,775 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 02:17:30,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:17:31,037 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 02:17:31,038 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 02:17:31,038 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1387995920] [2021-11-07 02:17:31,042 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1387995920] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 02:17:31,042 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:17:31,042 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 02:17:31,044 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [696930559] [2021-11-07 02:17:31,044 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 02:17:31,044 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 02:17:31,045 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 02:17:31,045 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 02:17:31,045 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 02:17:31,129 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:17:31,130 INFO L93 Difference]: Finished difference Result 54 states and 82 transitions. [2021-11-07 02:17:31,130 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 02:17:31,130 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 02:17:31,130 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:17:31,131 INFO L225 Difference]: With dead ends: 54 [2021-11-07 02:17:31,131 INFO L226 Difference]: Without dead ends: 36 [2021-11-07 02:17:31,132 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 02:17:31,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-11-07 02:17:31,135 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 25. [2021-11-07 02:17:31,135 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 02:17:31,136 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 37 transitions. [2021-11-07 02:17:31,136 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 37 transitions. Word has length 9 [2021-11-07 02:17:31,136 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:17:31,136 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 37 transitions. [2021-11-07 02:17:31,136 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 02:17:31,136 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 37 transitions. [2021-11-07 02:17:31,137 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-07 02:17:31,138 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:17:31,139 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:17:31,139 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-07 02:17:31,139 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:17:31,140 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:17:31,140 INFO L85 PathProgramCache]: Analyzing trace with hash -1423656826, now seen corresponding path program 1 times [2021-11-07 02:17:31,140 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 02:17:31,141 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1357847310] [2021-11-07 02:17:31,141 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:17:31,141 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 02:17:31,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:17:31,478 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 02:17:31,478 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 02:17:31,478 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1357847310] [2021-11-07 02:17:31,478 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1357847310] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 02:17:31,479 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:17:31,479 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 02:17:31,479 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1974818350] [2021-11-07 02:17:31,479 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 02:17:31,480 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 02:17:31,480 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 02:17:31,480 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 02:17:31,481 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 02:17:31,559 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:17:31,559 INFO L93 Difference]: Finished difference Result 52 states and 78 transitions. [2021-11-07 02:17:31,560 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 02:17:31,560 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 02:17:31,560 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:17:31,562 INFO L225 Difference]: With dead ends: 52 [2021-11-07 02:17:31,563 INFO L226 Difference]: Without dead ends: 34 [2021-11-07 02:17:31,563 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 02:17:31,563 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-11-07 02:17:31,573 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 26. [2021-11-07 02:17:31,573 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 02:17:31,574 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 38 transitions. [2021-11-07 02:17:31,574 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 38 transitions. Word has length 11 [2021-11-07 02:17:31,574 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:17:31,574 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 38 transitions. [2021-11-07 02:17:31,575 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 02:17:31,575 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 38 transitions. [2021-11-07 02:17:31,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-07 02:17:31,576 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:17:31,576 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:17:31,576 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-07 02:17:31,577 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:17:31,577 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:17:31,577 INFO L85 PathProgramCache]: Analyzing trace with hash -1271615739, now seen corresponding path program 1 times [2021-11-07 02:17:31,577 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 02:17:31,577 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [385252556] [2021-11-07 02:17:31,578 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:17:31,578 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 02:17:31,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:17:31,782 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 02:17:31,782 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 02:17:31,783 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [385252556] [2021-11-07 02:17:31,783 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [385252556] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 02:17:31,783 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:17:31,783 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 02:17:31,783 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [359814852] [2021-11-07 02:17:31,784 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 02:17:31,784 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 02:17:31,784 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 02:17:31,785 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 02:17:31,785 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 02:17:31,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:17:31,849 INFO L93 Difference]: Finished difference Result 53 states and 79 transitions. [2021-11-07 02:17:31,850 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 02:17:31,850 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 02:17:31,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:17:31,851 INFO L225 Difference]: With dead ends: 53 [2021-11-07 02:17:31,851 INFO L226 Difference]: Without dead ends: 35 [2021-11-07 02:17:31,851 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 02:17:31,851 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-11-07 02:17:31,854 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 28. [2021-11-07 02:17:31,855 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 02:17:31,855 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 39 transitions. [2021-11-07 02:17:31,855 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 39 transitions. Word has length 12 [2021-11-07 02:17:31,856 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:17:31,856 INFO L470 AbstractCegarLoop]: Abstraction has 28 states and 39 transitions. [2021-11-07 02:17:31,856 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 02:17:31,856 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 39 transitions. [2021-11-07 02:17:31,857 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-07 02:17:31,857 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:17:31,857 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:17:31,857 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-07 02:17:31,857 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:17:31,858 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:17:31,858 INFO L85 PathProgramCache]: Analyzing trace with hash -738226517, now seen corresponding path program 1 times [2021-11-07 02:17:31,858 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 02:17:31,858 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2037169876] [2021-11-07 02:17:31,858 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:17:31,858 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 02:17:32,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:17:32,140 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 02:17:32,140 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 02:17:32,141 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2037169876] [2021-11-07 02:17:32,141 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2037169876] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 02:17:32,142 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:17:32,142 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 02:17:32,142 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [721931148] [2021-11-07 02:17:32,143 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 02:17:32,143 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 02:17:32,143 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 02:17:32,144 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 02:17:32,146 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 02:17:32,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:17:32,210 INFO L93 Difference]: Finished difference Result 53 states and 76 transitions. [2021-11-07 02:17:32,210 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 02:17:32,210 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 02:17:32,211 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:17:32,211 INFO L225 Difference]: With dead ends: 53 [2021-11-07 02:17:32,211 INFO L226 Difference]: Without dead ends: 35 [2021-11-07 02:17:32,212 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 02:17:32,212 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-11-07 02:17:32,215 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 29. [2021-11-07 02:17:32,216 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 02:17:32,216 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 40 transitions. [2021-11-07 02:17:32,216 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 40 transitions. Word has length 14 [2021-11-07 02:17:32,217 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:17:32,217 INFO L470 AbstractCegarLoop]: Abstraction has 29 states and 40 transitions. [2021-11-07 02:17:32,217 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 02:17:32,217 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 40 transitions. [2021-11-07 02:17:32,218 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-07 02:17:32,218 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:17:32,218 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:17:32,218 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-07 02:17:32,219 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:17:32,219 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:17:32,219 INFO L85 PathProgramCache]: Analyzing trace with hash -1422800992, now seen corresponding path program 1 times [2021-11-07 02:17:32,219 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 02:17:32,220 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1620639059] [2021-11-07 02:17:32,220 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:17:32,220 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 02:17:32,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:17:32,309 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 02:17:32,310 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 02:17:32,310 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1620639059] [2021-11-07 02:17:32,310 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1620639059] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 02:17:32,310 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:17:32,310 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-07 02:17:32,311 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [802442953] [2021-11-07 02:17:32,311 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-07 02:17:32,311 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 02:17:32,312 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-07 02:17:32,312 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-07 02:17:32,312 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 02:17:32,466 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:17:32,466 INFO L93 Difference]: Finished difference Result 73 states and 109 transitions. [2021-11-07 02:17:32,466 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-07 02:17:32,466 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 02:17:32,467 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:17:32,467 INFO L225 Difference]: With dead ends: 73 [2021-11-07 02:17:32,467 INFO L226 Difference]: Without dead ends: 55 [2021-11-07 02:17:32,468 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 02:17:32,468 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-11-07 02:17:32,472 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 32. [2021-11-07 02:17:32,472 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 02:17:32,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 42 transitions. [2021-11-07 02:17:32,473 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 42 transitions. Word has length 15 [2021-11-07 02:17:32,473 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:17:32,473 INFO L470 AbstractCegarLoop]: Abstraction has 32 states and 42 transitions. [2021-11-07 02:17:32,473 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 02:17:32,473 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 42 transitions. [2021-11-07 02:17:32,474 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-07 02:17:32,474 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:17:32,474 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 02:17:32,474 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-07 02:17:32,474 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:17:32,475 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:17:32,475 INFO L85 PathProgramCache]: Analyzing trace with hash -1137122632, now seen corresponding path program 1 times [2021-11-07 02:17:32,475 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 02:17:32,475 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [215155730] [2021-11-07 02:17:32,475 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:17:32,476 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 02:17:32,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:17:33,046 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 02:17:33,046 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 02:17:33,046 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [215155730] [2021-11-07 02:17:33,046 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [215155730] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 02:17:33,046 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [361887844] [2021-11-07 02:17:33,047 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:17:33,047 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 02:17:33,047 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7e8051b9-ccc5-480c-9aed-3c65e0bebd15/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 02:17:33,049 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7e8051b9-ccc5-480c-9aed-3c65e0bebd15/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 02:17:33,073 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7e8051b9-ccc5-480c-9aed-3c65e0bebd15/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-07 02:17:33,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:17:33,233 INFO L263 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-07 02:17:33,246 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:17:47,744 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 02:17:47,744 INFO L328 TraceCheckSpWp]: Computing backward predicates...