./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/seq-mthreaded-reduced/pals_opt-floodmax.3.2.ufo.UNBOUNDED.pals.c.v+cfa-reducer.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_e07961f7-8633-460b-a42f-42e385ca28de/bin/utaipan-UUZaoUuFF8/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e07961f7-8633-460b-a42f-42e385ca28de/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_e07961f7-8633-460b-a42f-42e385ca28de/bin/utaipan-UUZaoUuFF8/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e07961f7-8633-460b-a42f-42e385ca28de/bin/utaipan-UUZaoUuFF8/config/TaipanReach.xml -i ../../sv-benchmarks/c/seq-mthreaded-reduced/pals_opt-floodmax.3.2.ufo.UNBOUNDED.pals.c.v+cfa-reducer.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e07961f7-8633-460b-a42f-42e385ca28de/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_e07961f7-8633-460b-a42f-42e385ca28de/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 4086756fe326e2f90904c763827ae3d38d44a78a9eb1422e3198b9e38a459658 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-47ea020 [2021-11-07 00:58:40,430 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-07 00:58:40,432 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-07 00:58:40,495 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-07 00:58:40,496 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-07 00:58:40,502 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-07 00:58:40,505 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-07 00:58:40,514 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-07 00:58:40,516 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-07 00:58:40,525 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-07 00:58:40,526 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-07 00:58:40,528 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-07 00:58:40,529 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-07 00:58:40,532 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-07 00:58:40,536 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-07 00:58:40,542 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-07 00:58:40,543 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-07 00:58:40,544 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-07 00:58:40,547 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-07 00:58:40,552 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-07 00:58:40,557 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-07 00:58:40,559 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-07 00:58:40,563 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-07 00:58:40,564 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-07 00:58:40,572 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-07 00:58:40,572 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-07 00:58:40,573 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-07 00:58:40,575 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-07 00:58:40,576 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-07 00:58:40,578 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-07 00:58:40,579 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-07 00:58:40,580 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-07 00:58:40,582 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-07 00:58:40,583 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-07 00:58:40,585 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-07 00:58:40,586 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-07 00:58:40,586 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-07 00:58:40,587 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-07 00:58:40,587 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-07 00:58:40,588 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-07 00:58:40,589 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-07 00:58:40,590 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e07961f7-8633-460b-a42f-42e385ca28de/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-07 00:58:40,648 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-07 00:58:40,648 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-07 00:58:40,650 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-07 00:58:40,650 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-07 00:58:40,650 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-07 00:58:40,651 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-07 00:58:40,651 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-07 00:58:40,651 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-07 00:58:40,658 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-07 00:58:40,659 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-07 00:58:40,660 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-07 00:58:40,660 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-07 00:58:40,661 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-07 00:58:40,661 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-07 00:58:40,661 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-07 00:58:40,662 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-07 00:58:40,662 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-07 00:58:40,663 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-07 00:58:40,663 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-07 00:58:40,663 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-07 00:58:40,663 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-07 00:58:40,664 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-07 00:58:40,664 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-07 00:58:40,664 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-07 00:58:40,665 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-07 00:58:40,665 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-07 00:58:40,665 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-07 00:58:40,665 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-07 00:58:40,666 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-07 00:58:40,666 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-07 00:58:40,666 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 00:58:40,666 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-07 00:58:40,667 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-07 00:58:40,667 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-07 00:58:40,667 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-07 00:58:40,668 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-07 00:58:40,668 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-07 00:58:40,668 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-07 00:58:40,669 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-07 00:58:40,669 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_e07961f7-8633-460b-a42f-42e385ca28de/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e07961f7-8633-460b-a42f-42e385ca28de/bin/utaipan-UUZaoUuFF8 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 4086756fe326e2f90904c763827ae3d38d44a78a9eb1422e3198b9e38a459658 [2021-11-07 00:58:40,954 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-07 00:58:40,982 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-07 00:58:40,985 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-07 00:58:40,987 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-07 00:58:40,988 INFO L275 PluginConnector]: CDTParser initialized [2021-11-07 00:58:40,989 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e07961f7-8633-460b-a42f-42e385ca28de/bin/utaipan-UUZaoUuFF8/../../sv-benchmarks/c/seq-mthreaded-reduced/pals_opt-floodmax.3.2.ufo.UNBOUNDED.pals.c.v+cfa-reducer.c [2021-11-07 00:58:41,069 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e07961f7-8633-460b-a42f-42e385ca28de/bin/utaipan-UUZaoUuFF8/data/462ae03c4/7399845986a54e0da4545a9b3fe9bfff/FLAG2624a77a7 [2021-11-07 00:58:41,696 INFO L306 CDTParser]: Found 1 translation units. [2021-11-07 00:58:41,697 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e07961f7-8633-460b-a42f-42e385ca28de/sv-benchmarks/c/seq-mthreaded-reduced/pals_opt-floodmax.3.2.ufo.UNBOUNDED.pals.c.v+cfa-reducer.c [2021-11-07 00:58:41,710 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e07961f7-8633-460b-a42f-42e385ca28de/bin/utaipan-UUZaoUuFF8/data/462ae03c4/7399845986a54e0da4545a9b3fe9bfff/FLAG2624a77a7 [2021-11-07 00:58:41,974 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e07961f7-8633-460b-a42f-42e385ca28de/bin/utaipan-UUZaoUuFF8/data/462ae03c4/7399845986a54e0da4545a9b3fe9bfff [2021-11-07 00:58:41,977 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-07 00:58:41,979 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-07 00:58:41,995 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-07 00:58:41,995 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-07 00:58:41,998 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-07 00:58:41,999 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 12:58:41" (1/1) ... [2021-11-07 00:58:42,000 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2503acf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:58:42, skipping insertion in model container [2021-11-07 00:58:42,001 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 12:58:41" (1/1) ... [2021-11-07 00:58:42,009 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-07 00:58:42,083 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 00:58:42,457 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_e07961f7-8633-460b-a42f-42e385ca28de/sv-benchmarks/c/seq-mthreaded-reduced/pals_opt-floodmax.3.2.ufo.UNBOUNDED.pals.c.v+cfa-reducer.c[7920,7933] [2021-11-07 00:58:42,527 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 00:58:42,559 INFO L203 MainTranslator]: Completed pre-run [2021-11-07 00:58:42,656 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_e07961f7-8633-460b-a42f-42e385ca28de/sv-benchmarks/c/seq-mthreaded-reduced/pals_opt-floodmax.3.2.ufo.UNBOUNDED.pals.c.v+cfa-reducer.c[7920,7933] [2021-11-07 00:58:42,701 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 00:58:42,721 INFO L208 MainTranslator]: Completed translation [2021-11-07 00:58:42,722 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:58:42 WrapperNode [2021-11-07 00:58:42,722 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-07 00:58:42,723 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-07 00:58:42,723 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-07 00:58:42,723 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-07 00:58:42,732 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:58:42" (1/1) ... [2021-11-07 00:58:42,747 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:58:42" (1/1) ... [2021-11-07 00:58:42,808 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-07 00:58:42,809 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-07 00:58:42,809 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-07 00:58:42,809 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-07 00:58:42,835 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:58:42" (1/1) ... [2021-11-07 00:58:42,835 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:58:42" (1/1) ... [2021-11-07 00:58:42,847 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:58:42" (1/1) ... [2021-11-07 00:58:42,847 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:58:42" (1/1) ... [2021-11-07 00:58:42,876 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:58:42" (1/1) ... [2021-11-07 00:58:42,896 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:58:42" (1/1) ... [2021-11-07 00:58:42,908 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:58:42" (1/1) ... [2021-11-07 00:58:42,913 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-07 00:58:42,927 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-07 00:58:42,928 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-07 00:58:42,928 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-07 00:58:42,929 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:58:42" (1/1) ... [2021-11-07 00:58:42,937 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 00:58:42,949 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e07961f7-8633-460b-a42f-42e385ca28de/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 00:58:42,962 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e07961f7-8633-460b-a42f-42e385ca28de/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-07 00:58:42,975 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e07961f7-8633-460b-a42f-42e385ca28de/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-07 00:58:43,013 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-07 00:58:43,013 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-07 00:58:43,013 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-07 00:58:43,013 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-07 00:58:44,910 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-07 00:58:44,911 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2021-11-07 00:58:44,914 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 12:58:44 BoogieIcfgContainer [2021-11-07 00:58:44,914 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-07 00:58:44,916 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-07 00:58:44,916 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-07 00:58:44,920 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-07 00:58:44,920 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 12:58:41" (1/3) ... [2021-11-07 00:58:44,922 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@35788f23 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 12:58:44, skipping insertion in model container [2021-11-07 00:58:44,922 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:58:42" (2/3) ... [2021-11-07 00:58:44,922 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@35788f23 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 12:58:44, skipping insertion in model container [2021-11-07 00:58:44,923 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 12:58:44" (3/3) ... [2021-11-07 00:58:44,925 INFO L111 eAbstractionObserver]: Analyzing ICFG pals_opt-floodmax.3.2.ufo.UNBOUNDED.pals.c.v+cfa-reducer.c [2021-11-07 00:58:44,937 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-07 00:58:44,937 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-07 00:58:45,000 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-07 00:58:45,007 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 00:58:45,008 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-07 00:58:45,027 INFO L276 IsEmpty]: Start isEmpty. Operand has 98 states, 96 states have (on average 1.7604166666666667) internal successors, (169), 97 states have internal predecessors, (169), 0 states have call successors, (0), 0 states 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 00:58:45,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-07 00:58:45,036 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:58:45,037 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:58:45,038 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:58:45,044 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:58:45,044 INFO L85 PathProgramCache]: Analyzing trace with hash 329552140, now seen corresponding path program 1 times [2021-11-07 00:58:45,056 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 00:58:45,057 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [646344911] [2021-11-07 00:58:45,057 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:58:45,058 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 00:58:45,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:58:45,495 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 00:58:45,496 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 00:58:45,496 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [646344911] [2021-11-07 00:58:45,497 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [646344911] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 00:58:45,497 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:58:45,498 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 00:58:45,500 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1334608472] [2021-11-07 00:58:45,505 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 00:58:45,505 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 00:58:45,519 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 00:58:45,520 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:58:45,523 INFO L87 Difference]: Start difference. First operand has 98 states, 96 states have (on average 1.7604166666666667) internal successors, (169), 97 states have internal predecessors, (169), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:45,594 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:58:45,594 INFO L93 Difference]: Finished difference Result 216 states and 358 transitions. [2021-11-07 00:58:45,595 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 00:58:45,601 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 43 [2021-11-07 00:58:45,602 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:58:45,619 INFO L225 Difference]: With dead ends: 216 [2021-11-07 00:58:45,619 INFO L226 Difference]: Without dead ends: 146 [2021-11-07 00:58:45,624 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:58:45,643 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2021-11-07 00:58:45,697 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 144. [2021-11-07 00:58:45,699 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 144 states, 143 states have (on average 1.5034965034965035) internal successors, (215), 143 states have internal predecessors, (215), 0 states have call successors, (0), 0 states 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 00:58:45,703 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 215 transitions. [2021-11-07 00:58:45,704 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 215 transitions. Word has length 43 [2021-11-07 00:58:45,705 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:58:45,705 INFO L470 AbstractCegarLoop]: Abstraction has 144 states and 215 transitions. [2021-11-07 00:58:45,705 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:45,706 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 215 transitions. [2021-11-07 00:58:45,708 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-07 00:58:45,708 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:58:45,708 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:58:45,709 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-07 00:58:45,709 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:58:45,710 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:58:45,710 INFO L85 PathProgramCache]: Analyzing trace with hash 497269843, now seen corresponding path program 1 times [2021-11-07 00:58:45,710 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 00:58:45,711 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [715599883] [2021-11-07 00:58:45,711 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:58:45,711 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 00:58:45,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:58:45,860 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 00:58:45,861 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 00:58:45,861 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [715599883] [2021-11-07 00:58:45,862 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [715599883] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 00:58:45,862 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:58:45,862 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 00:58:45,863 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [747743024] [2021-11-07 00:58:45,864 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 00:58:45,864 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 00:58:45,865 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 00:58:45,866 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:58:45,866 INFO L87 Difference]: Start difference. First operand 144 states and 215 transitions. Second operand has 3 states, 3 states have (on average 15.0) internal successors, (45), 3 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:45,949 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:58:45,951 INFO L93 Difference]: Finished difference Result 321 states and 502 transitions. [2021-11-07 00:58:45,952 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 00:58:45,953 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 15.0) internal successors, (45), 3 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 45 [2021-11-07 00:58:45,953 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:58:45,955 INFO L225 Difference]: With dead ends: 321 [2021-11-07 00:58:45,956 INFO L226 Difference]: Without dead ends: 209 [2021-11-07 00:58:45,957 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:58:45,958 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2021-11-07 00:58:45,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 207. [2021-11-07 00:58:45,982 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 207 states, 206 states have (on average 1.5242718446601942) internal successors, (314), 206 states have internal predecessors, (314), 0 states have call successors, (0), 0 states 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 00:58:45,987 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 314 transitions. [2021-11-07 00:58:45,987 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 314 transitions. Word has length 45 [2021-11-07 00:58:45,987 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:58:45,988 INFO L470 AbstractCegarLoop]: Abstraction has 207 states and 314 transitions. [2021-11-07 00:58:45,988 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 15.0) internal successors, (45), 3 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:45,988 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 314 transitions. [2021-11-07 00:58:45,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-07 00:58:45,990 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:58:45,990 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:58:45,990 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-07 00:58:45,991 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:58:45,991 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:58:45,991 INFO L85 PathProgramCache]: Analyzing trace with hash 385793492, now seen corresponding path program 1 times [2021-11-07 00:58:45,992 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 00:58:45,992 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1133045470] [2021-11-07 00:58:45,992 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:58:45,992 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 00:58:46,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:58:46,134 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 00:58:46,134 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 00:58:46,134 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1133045470] [2021-11-07 00:58:46,135 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1133045470] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 00:58:46,135 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:58:46,135 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 00:58:46,136 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1208021308] [2021-11-07 00:58:46,136 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 00:58:46,137 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 00:58:46,138 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 00:58:46,138 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:58:46,138 INFO L87 Difference]: Start difference. First operand 207 states and 314 transitions. Second operand has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 3 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:46,198 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:58:46,202 INFO L93 Difference]: Finished difference Result 511 states and 805 transitions. [2021-11-07 00:58:46,202 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 00:58:46,203 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 3 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 47 [2021-11-07 00:58:46,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:58:46,209 INFO L225 Difference]: With dead ends: 511 [2021-11-07 00:58:46,209 INFO L226 Difference]: Without dead ends: 338 [2021-11-07 00:58:46,214 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:58:46,216 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 338 states. [2021-11-07 00:58:46,267 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 338 to 336. [2021-11-07 00:58:46,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 336 states, 335 states have (on average 1.5552238805970149) internal successors, (521), 335 states have internal predecessors, (521), 0 states have call successors, (0), 0 states 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 00:58:46,280 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 336 states to 336 states and 521 transitions. [2021-11-07 00:58:46,281 INFO L78 Accepts]: Start accepts. Automaton has 336 states and 521 transitions. Word has length 47 [2021-11-07 00:58:46,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:58:46,281 INFO L470 AbstractCegarLoop]: Abstraction has 336 states and 521 transitions. [2021-11-07 00:58:46,282 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 3 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:46,282 INFO L276 IsEmpty]: Start isEmpty. Operand 336 states and 521 transitions. [2021-11-07 00:58:46,286 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-07 00:58:46,287 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:58:46,288 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:58:46,289 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-07 00:58:46,289 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:58:46,292 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:58:46,292 INFO L85 PathProgramCache]: Analyzing trace with hash 2142314995, now seen corresponding path program 1 times [2021-11-07 00:58:46,293 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 00:58:46,293 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [417301727] [2021-11-07 00:58:46,293 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:58:46,294 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 00:58:46,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:58:46,393 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 00:58:46,394 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 00:58:46,394 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [417301727] [2021-11-07 00:58:46,394 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [417301727] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 00:58:46,395 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:58:46,395 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 00:58:46,395 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [415258034] [2021-11-07 00:58:46,396 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 00:58:46,396 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 00:58:46,397 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 00:58:46,397 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:58:46,398 INFO L87 Difference]: Start difference. First operand 336 states and 521 transitions. Second operand has 3 states, 3 states have (on average 16.333333333333332) internal successors, (49), 3 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:46,451 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:58:46,451 INFO L93 Difference]: Finished difference Result 827 states and 1312 transitions. [2021-11-07 00:58:46,452 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 00:58:46,453 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 16.333333333333332) internal successors, (49), 3 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 49 [2021-11-07 00:58:46,455 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:58:46,459 INFO L225 Difference]: With dead ends: 827 [2021-11-07 00:58:46,459 INFO L226 Difference]: Without dead ends: 525 [2021-11-07 00:58:46,463 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:58:46,464 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 525 states. [2021-11-07 00:58:46,492 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 525 to 523. [2021-11-07 00:58:46,495 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 523 states, 522 states have (on average 1.5727969348659003) internal successors, (821), 522 states have internal predecessors, (821), 0 states have call successors, (0), 0 states 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 00:58:46,499 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 523 states to 523 states and 821 transitions. [2021-11-07 00:58:46,499 INFO L78 Accepts]: Start accepts. Automaton has 523 states and 821 transitions. Word has length 49 [2021-11-07 00:58:46,499 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:58:46,500 INFO L470 AbstractCegarLoop]: Abstraction has 523 states and 821 transitions. [2021-11-07 00:58:46,500 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 16.333333333333332) internal successors, (49), 3 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:46,500 INFO L276 IsEmpty]: Start isEmpty. Operand 523 states and 821 transitions. [2021-11-07 00:58:46,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-07 00:58:46,507 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:58:46,507 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:58:46,507 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-07 00:58:46,508 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:58:46,509 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:58:46,509 INFO L85 PathProgramCache]: Analyzing trace with hash 1343889268, now seen corresponding path program 1 times [2021-11-07 00:58:46,510 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 00:58:46,510 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1411978083] [2021-11-07 00:58:46,511 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:58:46,511 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 00:58:46,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:58:46,610 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 00:58:46,610 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 00:58:46,611 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1411978083] [2021-11-07 00:58:46,611 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1411978083] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 00:58:46,611 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:58:46,612 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 00:58:46,612 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [755312625] [2021-11-07 00:58:46,612 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 00:58:46,613 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 00:58:46,613 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 00:58:46,614 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:58:46,614 INFO L87 Difference]: Start difference. First operand 523 states and 821 transitions. Second operand has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:46,681 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:58:46,681 INFO L93 Difference]: Finished difference Result 1343 states and 2140 transitions. [2021-11-07 00:58:46,682 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 00:58:46,682 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 51 [2021-11-07 00:58:46,683 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:58:46,691 INFO L225 Difference]: With dead ends: 1343 [2021-11-07 00:58:46,691 INFO L226 Difference]: Without dead ends: 870 [2021-11-07 00:58:46,692 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:58:46,695 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 870 states. [2021-11-07 00:58:46,778 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 870 to 868. [2021-11-07 00:58:46,781 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 868 states, 867 states have (on average 1.5767012687427913) internal successors, (1367), 867 states have internal predecessors, (1367), 0 states have call successors, (0), 0 states 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 00:58:46,786 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 868 states to 868 states and 1367 transitions. [2021-11-07 00:58:46,786 INFO L78 Accepts]: Start accepts. Automaton has 868 states and 1367 transitions. Word has length 51 [2021-11-07 00:58:46,789 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:58:46,789 INFO L470 AbstractCegarLoop]: Abstraction has 868 states and 1367 transitions. [2021-11-07 00:58:46,789 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:46,789 INFO L276 IsEmpty]: Start isEmpty. Operand 868 states and 1367 transitions. [2021-11-07 00:58:46,794 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-11-07 00:58:46,794 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:58:46,794 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:58:46,795 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-07 00:58:46,795 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:58:46,795 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:58:46,796 INFO L85 PathProgramCache]: Analyzing trace with hash 1196001752, now seen corresponding path program 1 times [2021-11-07 00:58:46,796 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 00:58:46,796 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1417089806] [2021-11-07 00:58:46,796 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:58:46,797 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 00:58:46,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:58:46,897 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 00:58:46,898 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 00:58:46,898 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1417089806] [2021-11-07 00:58:46,898 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1417089806] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 00:58:46,899 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:58:46,899 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 00:58:46,899 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [845604707] [2021-11-07 00:58:46,899 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 00:58:46,900 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 00:58:46,900 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 00:58:46,901 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:58:46,901 INFO L87 Difference]: Start difference. First operand 868 states and 1367 transitions. Second operand has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 3 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:46,999 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:58:46,999 INFO L93 Difference]: Finished difference Result 2175 states and 3463 transitions. [2021-11-07 00:58:47,000 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 00:58:47,000 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 3 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 53 [2021-11-07 00:58:47,000 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:58:47,010 INFO L225 Difference]: With dead ends: 2175 [2021-11-07 00:58:47,011 INFO L226 Difference]: Without dead ends: 1357 [2021-11-07 00:58:47,013 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:58:47,015 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1357 states. [2021-11-07 00:58:47,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1357 to 1355. [2021-11-07 00:58:47,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1355 states, 1354 states have (on average 1.5834564254062038) internal successors, (2144), 1354 states have internal predecessors, (2144), 0 states have call successors, (0), 0 states 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 00:58:47,114 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1355 states to 1355 states and 2144 transitions. [2021-11-07 00:58:47,115 INFO L78 Accepts]: Start accepts. Automaton has 1355 states and 2144 transitions. Word has length 53 [2021-11-07 00:58:47,115 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:58:47,115 INFO L470 AbstractCegarLoop]: Abstraction has 1355 states and 2144 transitions. [2021-11-07 00:58:47,116 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 3 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:47,116 INFO L276 IsEmpty]: Start isEmpty. Operand 1355 states and 2144 transitions. [2021-11-07 00:58:47,116 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-07 00:58:47,116 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:58:47,117 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:58:47,117 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-07 00:58:47,118 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:58:47,118 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:58:47,118 INFO L85 PathProgramCache]: Analyzing trace with hash -1594004199, now seen corresponding path program 1 times [2021-11-07 00:58:47,118 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 00:58:47,119 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [93706506] [2021-11-07 00:58:47,119 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:58:47,119 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 00:58:47,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:58:47,215 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 00:58:47,216 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 00:58:47,216 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [93706506] [2021-11-07 00:58:47,216 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [93706506] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 00:58:47,217 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:58:47,217 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-07 00:58:47,217 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1042978441] [2021-11-07 00:58:47,218 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-07 00:58:47,219 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 00:58:47,219 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-07 00:58:47,219 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-07 00:58:47,220 INFO L87 Difference]: Start difference. First operand 1355 states and 2144 transitions. Second operand has 5 states, 5 states have (on average 11.0) internal successors, (55), 5 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:47,653 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:58:47,653 INFO L93 Difference]: Finished difference Result 3443 states and 5471 transitions. [2021-11-07 00:58:47,654 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-07 00:58:47,654 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 11.0) internal successors, (55), 5 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 55 [2021-11-07 00:58:47,655 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:58:47,670 INFO L225 Difference]: With dead ends: 3443 [2021-11-07 00:58:47,671 INFO L226 Difference]: Without dead ends: 2154 [2021-11-07 00:58:47,674 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 00:58:47,678 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2154 states. [2021-11-07 00:58:47,837 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2154 to 2144. [2021-11-07 00:58:47,844 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2144 states, 2143 states have (on average 1.5762949136724218) internal successors, (3378), 2143 states have internal predecessors, (3378), 0 states have call successors, (0), 0 states 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 00:58:47,855 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2144 states to 2144 states and 3378 transitions. [2021-11-07 00:58:47,855 INFO L78 Accepts]: Start accepts. Automaton has 2144 states and 3378 transitions. Word has length 55 [2021-11-07 00:58:47,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:58:47,857 INFO L470 AbstractCegarLoop]: Abstraction has 2144 states and 3378 transitions. [2021-11-07 00:58:47,857 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 11.0) internal successors, (55), 5 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:47,857 INFO L276 IsEmpty]: Start isEmpty. Operand 2144 states and 3378 transitions. [2021-11-07 00:58:47,858 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-07 00:58:47,858 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:58:47,858 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:58:47,859 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-07 00:58:47,859 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:58:47,859 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:58:47,860 INFO L85 PathProgramCache]: Analyzing trace with hash 2062973210, now seen corresponding path program 1 times [2021-11-07 00:58:47,860 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 00:58:47,860 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1833352587] [2021-11-07 00:58:47,860 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:58:47,860 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 00:58:47,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:58:47,925 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 00:58:47,926 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 00:58:47,926 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1833352587] [2021-11-07 00:58:47,926 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1833352587] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 00:58:47,927 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:58:47,927 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-07 00:58:47,927 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [244020660] [2021-11-07 00:58:47,928 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 00:58:47,928 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 00:58:47,929 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 00:58:47,929 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:58:47,929 INFO L87 Difference]: Start difference. First operand 2144 states and 3378 transitions. Second operand has 4 states, 4 states have (on average 14.0) internal successors, (56), 4 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:48,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:58:48,128 INFO L93 Difference]: Finished difference Result 4224 states and 6675 transitions. [2021-11-07 00:58:48,129 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 00:58:48,129 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.0) internal successors, (56), 4 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 56 [2021-11-07 00:58:48,129 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:58:48,144 INFO L225 Difference]: With dead ends: 4224 [2021-11-07 00:58:48,145 INFO L226 Difference]: Without dead ends: 2146 [2021-11-07 00:58:48,149 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-07 00:58:48,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2146 states. [2021-11-07 00:58:48,297 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2146 to 2144. [2021-11-07 00:58:48,304 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2144 states, 2143 states have (on average 1.570695286980868) internal successors, (3366), 2143 states have internal predecessors, (3366), 0 states have call successors, (0), 0 states 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 00:58:48,345 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2144 states to 2144 states and 3366 transitions. [2021-11-07 00:58:48,345 INFO L78 Accepts]: Start accepts. Automaton has 2144 states and 3366 transitions. Word has length 56 [2021-11-07 00:58:48,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:58:48,346 INFO L470 AbstractCegarLoop]: Abstraction has 2144 states and 3366 transitions. [2021-11-07 00:58:48,346 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.0) internal successors, (56), 4 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:48,346 INFO L276 IsEmpty]: Start isEmpty. Operand 2144 states and 3366 transitions. [2021-11-07 00:58:48,347 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-11-07 00:58:48,347 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:58:48,347 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:58:48,348 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-07 00:58:48,348 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:58:48,348 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:58:48,349 INFO L85 PathProgramCache]: Analyzing trace with hash -530286080, now seen corresponding path program 1 times [2021-11-07 00:58:48,349 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 00:58:48,349 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1132858162] [2021-11-07 00:58:48,349 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:58:48,350 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 00:58:48,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:58:48,418 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 00:58:48,419 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 00:58:48,419 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1132858162] [2021-11-07 00:58:48,419 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1132858162] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 00:58:48,419 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:58:48,420 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-07 00:58:48,423 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [516453349] [2021-11-07 00:58:48,423 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 00:58:48,423 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 00:58:48,424 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 00:58:48,424 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:58:48,425 INFO L87 Difference]: Start difference. First operand 2144 states and 3366 transitions. Second operand has 4 states, 4 states have (on average 14.25) internal successors, (57), 4 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:48,626 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:58:48,626 INFO L93 Difference]: Finished difference Result 4224 states and 6651 transitions. [2021-11-07 00:58:48,627 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 00:58:48,633 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.25) internal successors, (57), 4 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 57 [2021-11-07 00:58:48,633 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:58:48,648 INFO L225 Difference]: With dead ends: 4224 [2021-11-07 00:58:48,648 INFO L226 Difference]: Without dead ends: 2146 [2021-11-07 00:58:48,658 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-07 00:58:48,661 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2146 states. [2021-11-07 00:58:48,830 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2146 to 2144. [2021-11-07 00:58:48,836 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2144 states, 2143 states have (on average 1.565095660289314) internal successors, (3354), 2143 states have internal predecessors, (3354), 0 states have call successors, (0), 0 states 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 00:58:48,846 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2144 states to 2144 states and 3354 transitions. [2021-11-07 00:58:48,847 INFO L78 Accepts]: Start accepts. Automaton has 2144 states and 3354 transitions. Word has length 57 [2021-11-07 00:58:48,847 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:58:48,847 INFO L470 AbstractCegarLoop]: Abstraction has 2144 states and 3354 transitions. [2021-11-07 00:58:48,847 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.25) internal successors, (57), 4 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:48,848 INFO L276 IsEmpty]: Start isEmpty. Operand 2144 states and 3354 transitions. [2021-11-07 00:58:48,848 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-11-07 00:58:48,848 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:58:48,849 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:58:48,849 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-07 00:58:48,849 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:58:48,850 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:58:48,850 INFO L85 PathProgramCache]: Analyzing trace with hash 687612577, now seen corresponding path program 1 times [2021-11-07 00:58:48,850 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 00:58:48,850 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1190607660] [2021-11-07 00:58:48,851 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:58:48,851 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 00:58:48,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:58:48,902 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 00:58:48,903 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 00:58:48,903 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1190607660] [2021-11-07 00:58:48,903 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1190607660] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 00:58:48,904 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:58:48,904 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-07 00:58:48,904 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1003109299] [2021-11-07 00:58:48,905 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 00:58:48,905 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 00:58:48,905 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 00:58:48,906 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:58:48,906 INFO L87 Difference]: Start difference. First operand 2144 states and 3354 transitions. Second operand has 4 states, 4 states have (on average 14.5) internal successors, (58), 4 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:49,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:58:49,113 INFO L93 Difference]: Finished difference Result 4224 states and 6627 transitions. [2021-11-07 00:58:49,113 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 00:58:49,113 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.5) internal successors, (58), 4 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 58 [2021-11-07 00:58:49,114 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:58:49,129 INFO L225 Difference]: With dead ends: 4224 [2021-11-07 00:58:49,129 INFO L226 Difference]: Without dead ends: 2146 [2021-11-07 00:58:49,133 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-07 00:58:49,137 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2146 states. [2021-11-07 00:58:49,319 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2146 to 2144. [2021-11-07 00:58:49,326 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2144 states, 2143 states have (on average 1.5594960335977601) internal successors, (3342), 2143 states have internal predecessors, (3342), 0 states have call successors, (0), 0 states 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 00:58:49,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2144 states to 2144 states and 3342 transitions. [2021-11-07 00:58:49,337 INFO L78 Accepts]: Start accepts. Automaton has 2144 states and 3342 transitions. Word has length 58 [2021-11-07 00:58:49,337 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:58:49,337 INFO L470 AbstractCegarLoop]: Abstraction has 2144 states and 3342 transitions. [2021-11-07 00:58:49,338 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.5) internal successors, (58), 4 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:49,338 INFO L276 IsEmpty]: Start isEmpty. Operand 2144 states and 3342 transitions. [2021-11-07 00:58:49,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-07 00:58:49,339 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:58:49,339 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:58:49,339 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-07 00:58:49,340 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:58:49,340 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:58:49,340 INFO L85 PathProgramCache]: Analyzing trace with hash -2146587886, now seen corresponding path program 1 times [2021-11-07 00:58:49,340 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 00:58:49,341 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1358097299] [2021-11-07 00:58:49,341 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:58:49,341 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 00:58:49,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:58:49,470 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 00:58:49,470 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 00:58:49,470 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1358097299] [2021-11-07 00:58:49,470 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1358097299] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 00:58:49,471 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:58:49,471 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-07 00:58:49,471 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [389871647] [2021-11-07 00:58:49,471 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-07 00:58:49,472 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 00:58:49,472 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-07 00:58:49,473 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-07 00:58:49,473 INFO L87 Difference]: Start difference. First operand 2144 states and 3342 transitions. Second operand has 5 states, 5 states have (on average 12.0) internal successors, (60), 5 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:49,750 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:58:49,750 INFO L93 Difference]: Finished difference Result 4224 states and 6603 transitions. [2021-11-07 00:58:49,750 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-07 00:58:49,751 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 12.0) internal successors, (60), 5 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 60 [2021-11-07 00:58:49,751 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:58:49,766 INFO L225 Difference]: With dead ends: 4224 [2021-11-07 00:58:49,766 INFO L226 Difference]: Without dead ends: 2146 [2021-11-07 00:58:49,770 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2021-11-07 00:58:49,773 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2146 states. [2021-11-07 00:58:49,952 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2146 to 2144. [2021-11-07 00:58:49,958 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2144 states, 2143 states have (on average 1.5557629491367242) internal successors, (3334), 2143 states have internal predecessors, (3334), 0 states have call successors, (0), 0 states 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 00:58:49,965 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2144 states to 2144 states and 3334 transitions. [2021-11-07 00:58:49,966 INFO L78 Accepts]: Start accepts. Automaton has 2144 states and 3334 transitions. Word has length 60 [2021-11-07 00:58:49,966 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:58:49,966 INFO L470 AbstractCegarLoop]: Abstraction has 2144 states and 3334 transitions. [2021-11-07 00:58:49,966 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 12.0) internal successors, (60), 5 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:49,966 INFO L276 IsEmpty]: Start isEmpty. Operand 2144 states and 3334 transitions. [2021-11-07 00:58:49,967 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-11-07 00:58:49,967 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:58:49,967 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:58:49,968 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-11-07 00:58:49,968 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:58:49,968 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:58:49,968 INFO L85 PathProgramCache]: Analyzing trace with hash 1014792274, now seen corresponding path program 1 times [2021-11-07 00:58:49,968 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 00:58:49,969 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [613571387] [2021-11-07 00:58:49,969 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:58:49,969 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 00:58:49,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:58:50,080 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 00:58:50,080 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 00:58:50,081 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [613571387] [2021-11-07 00:58:50,081 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [613571387] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 00:58:50,081 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:58:50,081 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-07 00:58:50,081 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1853964915] [2021-11-07 00:58:50,082 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-07 00:58:50,082 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 00:58:50,083 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-07 00:58:50,083 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-07 00:58:50,083 INFO L87 Difference]: Start difference. First operand 2144 states and 3334 transitions. Second operand has 5 states, 5 states have (on average 12.6) internal successors, (63), 5 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:50,437 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:58:50,437 INFO L93 Difference]: Finished difference Result 5396 states and 8389 transitions. [2021-11-07 00:58:50,438 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-07 00:58:50,438 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 12.6) internal successors, (63), 5 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 63 [2021-11-07 00:58:50,438 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:58:50,461 INFO L225 Difference]: With dead ends: 5396 [2021-11-07 00:58:50,462 INFO L226 Difference]: Without dead ends: 3318 [2021-11-07 00:58:50,465 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2021-11-07 00:58:50,470 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3318 states. [2021-11-07 00:58:50,711 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3318 to 3316. [2021-11-07 00:58:50,721 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3316 states, 3315 states have (on average 1.5457013574660634) internal successors, (5124), 3315 states have internal predecessors, (5124), 0 states have call successors, (0), 0 states 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 00:58:50,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3316 states to 3316 states and 5124 transitions. [2021-11-07 00:58:50,734 INFO L78 Accepts]: Start accepts. Automaton has 3316 states and 5124 transitions. Word has length 63 [2021-11-07 00:58:50,734 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:58:50,734 INFO L470 AbstractCegarLoop]: Abstraction has 3316 states and 5124 transitions. [2021-11-07 00:58:50,734 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 12.6) internal successors, (63), 5 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:50,735 INFO L276 IsEmpty]: Start isEmpty. Operand 3316 states and 5124 transitions. [2021-11-07 00:58:50,735 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-07 00:58:50,735 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:58:50,736 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:58:50,736 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-11-07 00:58:50,736 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:58:50,737 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:58:50,737 INFO L85 PathProgramCache]: Analyzing trace with hash 1405226511, now seen corresponding path program 1 times [2021-11-07 00:58:50,737 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 00:58:50,737 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [984393099] [2021-11-07 00:58:50,738 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:58:50,738 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 00:58:50,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:58:50,868 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 00:58:50,868 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 00:58:50,868 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [984393099] [2021-11-07 00:58:50,868 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [984393099] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 00:58:50,869 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:58:50,869 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-07 00:58:50,869 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [370265557] [2021-11-07 00:58:50,870 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 00:58:50,870 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 00:58:50,870 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 00:58:50,871 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-07 00:58:50,871 INFO L87 Difference]: Start difference. First operand 3316 states and 5124 transitions. Second operand has 6 states, 6 states have (on average 10.666666666666666) internal successors, (64), 6 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:51,313 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:58:51,313 INFO L93 Difference]: Finished difference Result 4050 states and 6223 transitions. [2021-11-07 00:58:51,314 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-07 00:58:51,314 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 10.666666666666666) internal successors, (64), 6 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 64 [2021-11-07 00:58:51,315 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:58:51,342 INFO L225 Difference]: With dead ends: 4050 [2021-11-07 00:58:51,342 INFO L226 Difference]: Without dead ends: 4048 [2021-11-07 00:58:51,344 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2021-11-07 00:58:51,350 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4048 states. [2021-11-07 00:58:51,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4048 to 3322. [2021-11-07 00:58:51,699 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3322 states, 3321 states have (on average 1.5429087624209576) internal successors, (5124), 3321 states have internal predecessors, (5124), 0 states have call successors, (0), 0 states 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 00:58:51,713 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3322 states to 3322 states and 5124 transitions. [2021-11-07 00:58:51,714 INFO L78 Accepts]: Start accepts. Automaton has 3322 states and 5124 transitions. Word has length 64 [2021-11-07 00:58:51,714 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:58:51,714 INFO L470 AbstractCegarLoop]: Abstraction has 3322 states and 5124 transitions. [2021-11-07 00:58:51,715 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 10.666666666666666) internal successors, (64), 6 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:51,715 INFO L276 IsEmpty]: Start isEmpty. Operand 3322 states and 5124 transitions. [2021-11-07 00:58:51,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-11-07 00:58:51,716 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:58:51,717 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:58:51,717 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-11-07 00:58:51,717 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:58:51,718 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:58:51,718 INFO L85 PathProgramCache]: Analyzing trace with hash -1587806638, now seen corresponding path program 1 times [2021-11-07 00:58:51,718 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 00:58:51,718 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [118826865] [2021-11-07 00:58:51,718 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:58:51,719 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 00:58:51,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:58:52,265 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-07 00:58:52,265 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 00:58:52,265 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [118826865] [2021-11-07 00:58:52,265 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [118826865] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 00:58:52,266 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1762383342] [2021-11-07 00:58:52,266 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:58:52,266 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 00:58:52,266 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e07961f7-8633-460b-a42f-42e385ca28de/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 00:58:52,268 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e07961f7-8633-460b-a42f-42e385ca28de/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 00:58:52,294 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e07961f7-8633-460b-a42f-42e385ca28de/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-07 00:58:52,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:58:52,436 INFO L263 TraceCheckSpWp]: Trace formula consists of 372 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-07 00:58:52,444 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:58:53,674 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 00:58:53,675 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:58:54,373 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-07 00:58:54,374 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1762383342] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-07 00:58:54,374 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2021-11-07 00:58:54,374 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [10, 6] total 16 [2021-11-07 00:58:54,374 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2137685313] [2021-11-07 00:58:54,375 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-07 00:58:54,375 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 00:58:54,376 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-07 00:58:54,376 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-07 00:58:54,377 INFO L87 Difference]: Start difference. First operand 3322 states and 5124 transitions. Second operand has 5 states, 5 states have (on average 14.2) internal successors, (71), 4 states have internal predecessors, (71), 0 states have call successors, (0), 0 states 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 00:58:55,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:58:55,258 INFO L93 Difference]: Finished difference Result 9611 states and 14848 transitions. [2021-11-07 00:58:55,259 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-07 00:58:55,259 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 14.2) internal successors, (71), 4 states have internal predecessors, (71), 0 states have call successors, (0), 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 74 [2021-11-07 00:58:55,260 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:58:55,295 INFO L225 Difference]: With dead ends: 9611 [2021-11-07 00:58:55,295 INFO L226 Difference]: Without dead ends: 6352 [2021-11-07 00:58:55,301 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 140 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=60, Invalid=246, Unknown=0, NotChecked=0, Total=306 [2021-11-07 00:58:55,311 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6352 states. [2021-11-07 00:58:56,070 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6352 to 6350. [2021-11-07 00:58:56,089 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6350 states, 6349 states have (on average 1.5364624350291385) internal successors, (9755), 6349 states have internal predecessors, (9755), 0 states have call successors, (0), 0 states 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 00:58:56,110 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6350 states to 6350 states and 9755 transitions. [2021-11-07 00:58:56,110 INFO L78 Accepts]: Start accepts. Automaton has 6350 states and 9755 transitions. Word has length 74 [2021-11-07 00:58:56,111 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:58:56,111 INFO L470 AbstractCegarLoop]: Abstraction has 6350 states and 9755 transitions. [2021-11-07 00:58:56,111 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 14.2) internal successors, (71), 4 states have internal predecessors, (71), 0 states have call successors, (0), 0 states 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 00:58:56,111 INFO L276 IsEmpty]: Start isEmpty. Operand 6350 states and 9755 transitions. [2021-11-07 00:58:56,113 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-11-07 00:58:56,113 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:58:56,113 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:58:56,158 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e07961f7-8633-460b-a42f-42e385ca28de/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-07 00:58:56,327 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e07961f7-8633-460b-a42f-42e385ca28de/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-07 00:58:56,327 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:58:56,328 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:58:56,328 INFO L85 PathProgramCache]: Analyzing trace with hash -1520415030, now seen corresponding path program 1 times [2021-11-07 00:58:56,328 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 00:58:56,328 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [815898274] [2021-11-07 00:58:56,328 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:58:56,328 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 00:58:56,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:58:56,397 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 00:58:56,398 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 00:58:56,398 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [815898274] [2021-11-07 00:58:56,398 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [815898274] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 00:58:56,398 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:58:56,399 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 00:58:56,401 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1351118274] [2021-11-07 00:58:56,402 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 00:58:56,402 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 00:58:56,403 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 00:58:56,403 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:58:56,413 INFO L87 Difference]: Start difference. First operand 6350 states and 9755 transitions. Second operand has 3 states, 3 states have (on average 24.0) internal successors, (72), 3 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:57,264 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:58:57,264 INFO L93 Difference]: Finished difference Result 14886 states and 22955 transitions. [2021-11-07 00:58:57,279 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 00:58:57,280 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 24.0) internal successors, (72), 3 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 75 [2021-11-07 00:58:57,280 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:58:57,317 INFO L225 Difference]: With dead ends: 14886 [2021-11-07 00:58:57,318 INFO L226 Difference]: Without dead ends: 8594 [2021-11-07 00:58:57,343 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:58:57,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8594 states. [2021-11-07 00:58:58,244 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8594 to 8592. [2021-11-07 00:58:58,256 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8592 states, 8591 states have (on average 1.5282272145268303) internal successors, (13129), 8591 states have internal predecessors, (13129), 0 states have call successors, (0), 0 states 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 00:58:58,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8592 states to 8592 states and 13129 transitions. [2021-11-07 00:58:58,278 INFO L78 Accepts]: Start accepts. Automaton has 8592 states and 13129 transitions. Word has length 75 [2021-11-07 00:58:58,279 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:58:58,279 INFO L470 AbstractCegarLoop]: Abstraction has 8592 states and 13129 transitions. [2021-11-07 00:58:58,279 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 24.0) internal successors, (72), 3 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:58,279 INFO L276 IsEmpty]: Start isEmpty. Operand 8592 states and 13129 transitions. [2021-11-07 00:58:58,280 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-11-07 00:58:58,280 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:58:58,281 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:58:58,281 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-11-07 00:58:58,281 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:58:58,282 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:58:58,282 INFO L85 PathProgramCache]: Analyzing trace with hash -1253184500, now seen corresponding path program 1 times [2021-11-07 00:58:58,283 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 00:58:58,283 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [731105592] [2021-11-07 00:58:58,283 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:58:58,284 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 00:58:58,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:58:58,380 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 00:58:58,380 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 00:58:58,380 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [731105592] [2021-11-07 00:58:58,380 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [731105592] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 00:58:58,381 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:58:58,381 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-07 00:58:58,381 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1887362451] [2021-11-07 00:58:58,381 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-07 00:58:58,382 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 00:58:58,382 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-07 00:58:58,383 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-07 00:58:58,383 INFO L87 Difference]: Start difference. First operand 8592 states and 13129 transitions. Second operand has 5 states, 5 states have (on average 15.0) internal successors, (75), 4 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:59,326 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:58:59,326 INFO L93 Difference]: Finished difference Result 17128 states and 26191 transitions. [2021-11-07 00:58:59,327 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-07 00:58:59,327 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 15.0) internal successors, (75), 4 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 78 [2021-11-07 00:58:59,327 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:58:59,356 INFO L225 Difference]: With dead ends: 17128 [2021-11-07 00:58:59,357 INFO L226 Difference]: Without dead ends: 8592 [2021-11-07 00:58:59,375 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-07 00:58:59,391 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8592 states. [2021-11-07 00:59:00,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8592 to 8592. [2021-11-07 00:59:00,083 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8592 states, 8591 states have (on average 1.511931090676289) internal successors, (12989), 8591 states have internal predecessors, (12989), 0 states have call successors, (0), 0 states 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 00:59:00,105 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8592 states to 8592 states and 12989 transitions. [2021-11-07 00:59:00,105 INFO L78 Accepts]: Start accepts. Automaton has 8592 states and 12989 transitions. Word has length 78 [2021-11-07 00:59:00,106 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:59:00,106 INFO L470 AbstractCegarLoop]: Abstraction has 8592 states and 12989 transitions. [2021-11-07 00:59:00,106 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 15.0) internal successors, (75), 4 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:59:00,106 INFO L276 IsEmpty]: Start isEmpty. Operand 8592 states and 12989 transitions. [2021-11-07 00:59:00,107 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-11-07 00:59:00,108 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:59:00,108 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:59:00,108 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-11-07 00:59:00,108 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:59:00,109 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:59:00,109 INFO L85 PathProgramCache]: Analyzing trace with hash -1878446745, now seen corresponding path program 1 times [2021-11-07 00:59:00,109 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 00:59:00,110 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [487329333] [2021-11-07 00:59:00,110 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:59:00,110 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 00:59:00,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:59:00,479 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-07 00:59:00,479 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 00:59:00,480 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [487329333] [2021-11-07 00:59:00,480 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [487329333] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 00:59:00,480 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2048163206] [2021-11-07 00:59:00,480 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:59:00,480 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 00:59:00,480 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e07961f7-8633-460b-a42f-42e385ca28de/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 00:59:00,483 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e07961f7-8633-460b-a42f-42e385ca28de/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 00:59:00,491 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e07961f7-8633-460b-a42f-42e385ca28de/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-07 00:59:00,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:59:00,830 INFO L263 TraceCheckSpWp]: Trace formula consists of 379 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-07 00:59:00,837 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:59:01,961 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-07 00:59:01,961 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:59:02,661 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-07 00:59:02,662 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2048163206] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-07 00:59:02,662 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2021-11-07 00:59:02,662 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [10, 6] total 16 [2021-11-07 00:59:02,663 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [662057128] [2021-11-07 00:59:02,663 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-07 00:59:02,664 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 00:59:02,664 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-07 00:59:02,665 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-07 00:59:02,665 INFO L87 Difference]: Start difference. First operand 8592 states and 12989 transitions. Second operand has 5 states, 5 states have (on average 15.2) internal successors, (76), 4 states have internal predecessors, (76), 0 states have call successors, (0), 0 states 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 00:59:04,355 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:59:04,355 INFO L93 Difference]: Finished difference Result 25116 states and 37971 transitions. [2021-11-07 00:59:04,356 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-07 00:59:04,356 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 15.2) internal successors, (76), 4 states have internal predecessors, (76), 0 states have call successors, (0), 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 78 [2021-11-07 00:59:04,357 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:59:04,422 INFO L225 Difference]: With dead ends: 25116 [2021-11-07 00:59:04,422 INFO L226 Difference]: Without dead ends: 16594 [2021-11-07 00:59:04,440 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 148 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=60, Invalid=246, Unknown=0, NotChecked=0, Total=306 [2021-11-07 00:59:04,468 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16594 states. [2021-11-07 00:59:06,230 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16594 to 16592. [2021-11-07 00:59:06,244 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16592 states, 16591 states have (on average 1.504369839069375) internal successors, (24959), 16591 states have internal predecessors, (24959), 0 states have call successors, (0), 0 states 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 00:59:06,283 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16592 states to 16592 states and 24959 transitions. [2021-11-07 00:59:06,284 INFO L78 Accepts]: Start accepts. Automaton has 16592 states and 24959 transitions. Word has length 78 [2021-11-07 00:59:06,284 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:59:06,284 INFO L470 AbstractCegarLoop]: Abstraction has 16592 states and 24959 transitions. [2021-11-07 00:59:06,284 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 15.2) internal successors, (76), 4 states have internal predecessors, (76), 0 states have call successors, (0), 0 states 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 00:59:06,285 INFO L276 IsEmpty]: Start isEmpty. Operand 16592 states and 24959 transitions. [2021-11-07 00:59:06,286 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-07 00:59:06,286 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:59:06,287 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:59:06,328 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e07961f7-8633-460b-a42f-42e385ca28de/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-07 00:59:06,515 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e07961f7-8633-460b-a42f-42e385ca28de/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-07 00:59:06,515 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:59:06,516 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:59:06,516 INFO L85 PathProgramCache]: Analyzing trace with hash 1688311817, now seen corresponding path program 1 times [2021-11-07 00:59:06,516 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 00:59:06,516 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [282623166] [2021-11-07 00:59:06,516 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:59:06,516 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 00:59:06,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:59:06,576 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-07 00:59:06,576 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 00:59:06,576 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [282623166] [2021-11-07 00:59:06,576 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [282623166] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 00:59:06,577 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:59:06,577 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 00:59:06,579 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [214617745] [2021-11-07 00:59:06,579 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 00:59:06,580 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 00:59:06,580 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 00:59:06,580 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:59:06,581 INFO L87 Difference]: Start difference. First operand 16592 states and 24959 transitions. Second operand has 3 states, 3 states have (on average 25.666666666666668) internal successors, (77), 3 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:59:08,485 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:59:08,485 INFO L93 Difference]: Finished difference Result 38726 states and 58419 transitions. [2021-11-07 00:59:08,486 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 00:59:08,486 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 25.666666666666668) internal successors, (77), 3 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 79 [2021-11-07 00:59:08,486 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:59:08,537 INFO L225 Difference]: With dead ends: 38726 [2021-11-07 00:59:08,538 INFO L226 Difference]: Without dead ends: 22204 [2021-11-07 00:59:08,571 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:59:08,596 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22204 states. [2021-11-07 00:59:11,020 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22204 to 22202. [2021-11-07 00:59:11,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22202 states, 22201 states have (on average 1.4967343813341742) internal successors, (33229), 22201 states have internal predecessors, (33229), 0 states have call successors, (0), 0 states 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 00:59:11,094 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22202 states to 22202 states and 33229 transitions. [2021-11-07 00:59:11,095 INFO L78 Accepts]: Start accepts. Automaton has 22202 states and 33229 transitions. Word has length 79 [2021-11-07 00:59:11,095 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:59:11,095 INFO L470 AbstractCegarLoop]: Abstraction has 22202 states and 33229 transitions. [2021-11-07 00:59:11,095 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 25.666666666666668) internal successors, (77), 3 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:59:11,096 INFO L276 IsEmpty]: Start isEmpty. Operand 22202 states and 33229 transitions. [2021-11-07 00:59:11,097 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-11-07 00:59:11,097 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:59:11,098 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:59:11,098 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-11-07 00:59:11,098 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:59:11,099 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:59:11,099 INFO L85 PathProgramCache]: Analyzing trace with hash -119256388, now seen corresponding path program 1 times [2021-11-07 00:59:11,099 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 00:59:11,100 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2125662259] [2021-11-07 00:59:11,100 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:59:11,100 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 00:59:11,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:59:11,507 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-07 00:59:11,507 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 00:59:11,507 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2125662259] [2021-11-07 00:59:11,507 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2125662259] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 00:59:11,507 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1032964846] [2021-11-07 00:59:11,508 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:59:11,508 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 00:59:11,508 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e07961f7-8633-460b-a42f-42e385ca28de/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 00:59:11,509 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e07961f7-8633-460b-a42f-42e385ca28de/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 00:59:11,535 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e07961f7-8633-460b-a42f-42e385ca28de/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-07 00:59:11,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:59:11,880 INFO L263 TraceCheckSpWp]: Trace formula consists of 386 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-07 00:59:11,884 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:59:12,715 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-07 00:59:12,715 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:59:13,300 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 00:59:13,300 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1032964846] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-07 00:59:13,300 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2021-11-07 00:59:13,301 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [10, 6] total 16 [2021-11-07 00:59:13,301 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1586363578] [2021-11-07 00:59:13,302 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-07 00:59:13,303 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 00:59:13,303 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-07 00:59:13,304 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-07 00:59:13,304 INFO L87 Difference]: Start difference. First operand 22202 states and 33229 transitions. Second operand has 5 states, 5 states have (on average 15.6) internal successors, (78), 4 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:59:18,092 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:59:18,092 INFO L93 Difference]: Finished difference Result 64313 states and 96059 transitions. [2021-11-07 00:59:18,093 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-07 00:59:18,093 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 15.6) internal successors, (78), 4 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 82 [2021-11-07 00:59:18,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:59:18,164 INFO L225 Difference]: With dead ends: 64313 [2021-11-07 00:59:18,164 INFO L226 Difference]: Without dead ends: 42158 [2021-11-07 00:59:18,187 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 156 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=60, Invalid=246, Unknown=0, NotChecked=0, Total=306 [2021-11-07 00:59:18,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42158 states. [2021-11-07 00:59:22,864 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42158 to 42156. [2021-11-07 00:59:22,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42156 states, 42155 states have (on average 1.4812714980429367) internal successors, (62443), 42155 states have internal predecessors, (62443), 0 states have call successors, (0), 0 states 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 00:59:23,149 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42156 states to 42156 states and 62443 transitions. [2021-11-07 00:59:23,149 INFO L78 Accepts]: Start accepts. Automaton has 42156 states and 62443 transitions. Word has length 82 [2021-11-07 00:59:23,149 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:59:23,150 INFO L470 AbstractCegarLoop]: Abstraction has 42156 states and 62443 transitions. [2021-11-07 00:59:23,150 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 15.6) internal successors, (78), 4 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:59:23,150 INFO L276 IsEmpty]: Start isEmpty. Operand 42156 states and 62443 transitions. [2021-11-07 00:59:23,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-11-07 00:59:23,152 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:59:23,152 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:59:23,181 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e07961f7-8633-460b-a42f-42e385ca28de/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-07 00:59:23,353 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e07961f7-8633-460b-a42f-42e385ca28de/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 00:59:23,353 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:59:23,354 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:59:23,354 INFO L85 PathProgramCache]: Analyzing trace with hash 2000594802, now seen corresponding path program 1 times [2021-11-07 00:59:23,354 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 00:59:23,354 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [808247585] [2021-11-07 00:59:23,354 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:59:23,354 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 00:59:23,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:59:23,409 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-07 00:59:23,409 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 00:59:23,412 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [808247585] [2021-11-07 00:59:23,412 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [808247585] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 00:59:23,412 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:59:23,413 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 00:59:23,414 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1817494877] [2021-11-07 00:59:23,414 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 00:59:23,415 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 00:59:23,415 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 00:59:23,415 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:59:23,416 INFO L87 Difference]: Start difference. First operand 42156 states and 62443 transitions. Second operand has 3 states, 3 states have (on average 26.333333333333332) internal successors, (79), 3 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:59:29,958 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:59:29,959 INFO L93 Difference]: Finished difference Result 102124 states and 152149 transitions. [2021-11-07 00:59:29,959 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 00:59:29,959 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 26.333333333333332) internal successors, (79), 3 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 83 [2021-11-07 00:59:29,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:59:30,073 INFO L225 Difference]: With dead ends: 102124 [2021-11-07 00:59:30,074 INFO L226 Difference]: Without dead ends: 60010 [2021-11-07 00:59:30,109 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:59:30,172 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60010 states. [2021-11-07 00:59:36,615 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60010 to 60008. [2021-11-07 00:59:36,662 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60008 states, 60007 states have (on average 1.4736447414468312) internal successors, (88429), 60007 states have internal predecessors, (88429), 0 states have call successors, (0), 0 states 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 00:59:36,993 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60008 states to 60008 states and 88429 transitions. [2021-11-07 00:59:36,993 INFO L78 Accepts]: Start accepts. Automaton has 60008 states and 88429 transitions. Word has length 83 [2021-11-07 00:59:36,993 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:59:36,994 INFO L470 AbstractCegarLoop]: Abstraction has 60008 states and 88429 transitions. [2021-11-07 00:59:36,994 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 26.333333333333332) internal successors, (79), 3 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:59:36,994 INFO L276 IsEmpty]: Start isEmpty. Operand 60008 states and 88429 transitions. [2021-11-07 00:59:36,996 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-11-07 00:59:36,997 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:59:36,997 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:59:36,997 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2021-11-07 00:59:36,997 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:59:36,998 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:59:36,998 INFO L85 PathProgramCache]: Analyzing trace with hash 193958033, now seen corresponding path program 1 times [2021-11-07 00:59:36,998 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 00:59:36,999 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [586767047] [2021-11-07 00:59:36,999 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:59:36,999 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 00:59:37,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:59:37,456 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-07 00:59:37,456 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 00:59:37,456 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [586767047] [2021-11-07 00:59:37,457 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [586767047] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 00:59:37,457 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1962178406] [2021-11-07 00:59:37,457 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:59:37,457 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 00:59:37,457 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e07961f7-8633-460b-a42f-42e385ca28de/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 00:59:37,458 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e07961f7-8633-460b-a42f-42e385ca28de/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 00:59:37,475 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e07961f7-8633-460b-a42f-42e385ca28de/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-07 00:59:38,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:59:38,029 INFO L263 TraceCheckSpWp]: Trace formula consists of 393 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-07 00:59:38,034 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:59:39,443 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 00:59:39,444 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:59:40,220 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-07 00:59:40,220 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1962178406] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-07 00:59:40,220 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2021-11-07 00:59:40,220 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [10, 7] total 18 [2021-11-07 00:59:40,221 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1088355645] [2021-11-07 00:59:40,221 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 00:59:40,221 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 00:59:40,224 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 00:59:40,225 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2021-11-07 00:59:40,225 INFO L87 Difference]: Start difference. First operand 60008 states and 88429 transitions. Second operand has 6 states, 6 states have (on average 13.833333333333334) internal successors, (83), 5 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)