./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/systemc/token_ring.05.cil-2.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_a6ecc55c-4d29-40ea-acf9-4c8c58918f81/bin/utaipan-UUZaoUuFF8/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a6ecc55c-4d29-40ea-acf9-4c8c58918f81/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_a6ecc55c-4d29-40ea-acf9-4c8c58918f81/bin/utaipan-UUZaoUuFF8/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a6ecc55c-4d29-40ea-acf9-4c8c58918f81/bin/utaipan-UUZaoUuFF8/config/TaipanReach.xml -i ../../sv-benchmarks/c/systemc/token_ring.05.cil-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a6ecc55c-4d29-40ea-acf9-4c8c58918f81/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_a6ecc55c-4d29-40ea-acf9-4c8c58918f81/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 16e147b68a860b93a665f8bd36a316225675cf186d50a72fc3242bc6ec552f78 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-47ea020 [2021-11-07 00:53:27,676 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-07 00:53:27,678 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-07 00:53:27,736 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-07 00:53:27,736 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-07 00:53:27,741 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-07 00:53:27,743 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-07 00:53:27,747 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-07 00:53:27,749 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-07 00:53:27,755 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-07 00:53:27,756 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-07 00:53:27,758 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-07 00:53:27,759 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-07 00:53:27,762 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-07 00:53:27,764 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-07 00:53:27,769 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-07 00:53:27,771 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-07 00:53:27,772 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-07 00:53:27,775 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-07 00:53:27,783 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-07 00:53:27,785 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-07 00:53:27,787 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-07 00:53:27,790 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-07 00:53:27,791 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-07 00:53:27,800 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-07 00:53:27,801 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-07 00:53:27,801 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-07 00:53:27,803 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-07 00:53:27,804 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-07 00:53:27,805 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-07 00:53:27,806 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-07 00:53:27,807 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-07 00:53:27,809 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-07 00:53:27,810 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-07 00:53:27,812 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-07 00:53:27,812 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-07 00:53:27,813 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-07 00:53:27,813 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-07 00:53:27,814 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-07 00:53:27,815 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-07 00:53:27,815 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-07 00:53:27,816 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a6ecc55c-4d29-40ea-acf9-4c8c58918f81/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-07 00:53:27,867 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-07 00:53:27,868 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-07 00:53:27,870 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-07 00:53:27,870 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-07 00:53:27,870 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-07 00:53:27,870 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-07 00:53:27,871 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-07 00:53:27,871 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-07 00:53:27,871 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-07 00:53:27,871 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-07 00:53:27,872 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-07 00:53:27,872 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-07 00:53:27,873 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-07 00:53:27,873 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-07 00:53:27,873 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-07 00:53:27,874 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-07 00:53:27,874 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-07 00:53:27,874 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-07 00:53:27,874 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-07 00:53:27,875 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-07 00:53:27,875 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-07 00:53:27,875 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-07 00:53:27,875 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-07 00:53:27,875 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-07 00:53:27,876 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-07 00:53:27,876 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-07 00:53:27,876 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-07 00:53:27,876 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-07 00:53:27,876 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-07 00:53:27,877 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-07 00:53:27,877 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 00:53:27,877 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-07 00:53:27,877 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-07 00:53:27,878 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-07 00:53:27,878 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-07 00:53:27,878 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-07 00:53:27,878 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-07 00:53:27,878 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-07 00:53:27,878 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-07 00:53:27,879 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_a6ecc55c-4d29-40ea-acf9-4c8c58918f81/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a6ecc55c-4d29-40ea-acf9-4c8c58918f81/bin/utaipan-UUZaoUuFF8 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 16e147b68a860b93a665f8bd36a316225675cf186d50a72fc3242bc6ec552f78 [2021-11-07 00:53:28,242 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-07 00:53:28,280 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-07 00:53:28,283 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-07 00:53:28,285 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-07 00:53:28,286 INFO L275 PluginConnector]: CDTParser initialized [2021-11-07 00:53:28,287 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a6ecc55c-4d29-40ea-acf9-4c8c58918f81/bin/utaipan-UUZaoUuFF8/../../sv-benchmarks/c/systemc/token_ring.05.cil-2.c [2021-11-07 00:53:28,361 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a6ecc55c-4d29-40ea-acf9-4c8c58918f81/bin/utaipan-UUZaoUuFF8/data/788e082b5/707f32bef1624b5ea805afbedc401602/FLAG5451ca530 [2021-11-07 00:53:28,888 INFO L306 CDTParser]: Found 1 translation units. [2021-11-07 00:53:28,889 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a6ecc55c-4d29-40ea-acf9-4c8c58918f81/sv-benchmarks/c/systemc/token_ring.05.cil-2.c [2021-11-07 00:53:28,908 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a6ecc55c-4d29-40ea-acf9-4c8c58918f81/bin/utaipan-UUZaoUuFF8/data/788e082b5/707f32bef1624b5ea805afbedc401602/FLAG5451ca530 [2021-11-07 00:53:29,203 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a6ecc55c-4d29-40ea-acf9-4c8c58918f81/bin/utaipan-UUZaoUuFF8/data/788e082b5/707f32bef1624b5ea805afbedc401602 [2021-11-07 00:53:29,207 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-07 00:53:29,209 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-07 00:53:29,213 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-07 00:53:29,214 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-07 00:53:29,219 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-07 00:53:29,219 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 12:53:29" (1/1) ... [2021-11-07 00:53:29,222 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2b82a634 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:53:29, skipping insertion in model container [2021-11-07 00:53:29,222 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 12:53:29" (1/1) ... [2021-11-07 00:53:29,230 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-07 00:53:29,284 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 00:53:29,488 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_a6ecc55c-4d29-40ea-acf9-4c8c58918f81/sv-benchmarks/c/systemc/token_ring.05.cil-2.c[671,684] [2021-11-07 00:53:29,569 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 00:53:29,579 INFO L203 MainTranslator]: Completed pre-run [2021-11-07 00:53:29,591 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_a6ecc55c-4d29-40ea-acf9-4c8c58918f81/sv-benchmarks/c/systemc/token_ring.05.cil-2.c[671,684] [2021-11-07 00:53:29,648 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 00:53:29,684 INFO L208 MainTranslator]: Completed translation [2021-11-07 00:53:29,684 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:53:29 WrapperNode [2021-11-07 00:53:29,684 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-07 00:53:29,687 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-07 00:53:29,688 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-07 00:53:29,688 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-07 00:53:29,695 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:53:29" (1/1) ... [2021-11-07 00:53:29,724 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:53:29" (1/1) ... [2021-11-07 00:53:29,824 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-07 00:53:29,825 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-07 00:53:29,826 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-07 00:53:29,826 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-07 00:53:29,835 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:53:29" (1/1) ... [2021-11-07 00:53:29,836 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:53:29" (1/1) ... [2021-11-07 00:53:29,841 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:53:29" (1/1) ... [2021-11-07 00:53:29,842 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:53:29" (1/1) ... [2021-11-07 00:53:29,861 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:53:29" (1/1) ... [2021-11-07 00:53:29,880 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:53:29" (1/1) ... [2021-11-07 00:53:29,883 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:53:29" (1/1) ... [2021-11-07 00:53:29,891 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-07 00:53:29,908 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-07 00:53:29,908 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-07 00:53:29,908 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-07 00:53:29,909 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:53:29" (1/1) ... [2021-11-07 00:53:29,917 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 00:53:29,935 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a6ecc55c-4d29-40ea-acf9-4c8c58918f81/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 00:53:29,953 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a6ecc55c-4d29-40ea-acf9-4c8c58918f81/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-07 00:53:29,984 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a6ecc55c-4d29-40ea-acf9-4c8c58918f81/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-07 00:53:30,002 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-07 00:53:30,003 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-07 00:53:30,004 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-07 00:53:30,005 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-07 00:53:32,941 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-07 00:53:32,942 INFO L299 CfgBuilder]: Removed 198 assume(true) statements. [2021-11-07 00:53:32,945 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 12:53:32 BoogieIcfgContainer [2021-11-07 00:53:32,945 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-07 00:53:32,947 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-07 00:53:32,948 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-07 00:53:32,951 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-07 00:53:32,951 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 12:53:29" (1/3) ... [2021-11-07 00:53:32,952 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@750b2553 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 12:53:32, skipping insertion in model container [2021-11-07 00:53:32,952 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:53:29" (2/3) ... [2021-11-07 00:53:32,953 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@750b2553 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 12:53:32, skipping insertion in model container [2021-11-07 00:53:32,953 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 12:53:32" (3/3) ... [2021-11-07 00:53:32,954 INFO L111 eAbstractionObserver]: Analyzing ICFG token_ring.05.cil-2.c [2021-11-07 00:53:32,960 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-07 00:53:32,960 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-07 00:53:33,011 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-07 00:53:33,018 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 00:53:33,018 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-07 00:53:33,039 INFO L276 IsEmpty]: Start isEmpty. Operand has 264 states, 261 states have (on average 1.5517241379310345) internal successors, (405), 263 states have internal predecessors, (405), 0 states have call successors, (0), 0 states 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 00:53:33,045 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-07 00:53:33,046 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:53:33,046 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] [2021-11-07 00:53:33,047 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:53:33,053 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:53:33,053 INFO L85 PathProgramCache]: Analyzing trace with hash 1144569763, now seen corresponding path program 1 times [2021-11-07 00:53:33,062 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 00:53:33,063 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1263304563] [2021-11-07 00:53:33,063 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:53:33,064 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 00:53:33,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:53:33,255 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 00:53:33,256 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 00:53:33,256 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1263304563] [2021-11-07 00:53:33,257 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1263304563] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 00:53:33,257 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:53:33,257 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-07 00:53:33,259 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [131754231] [2021-11-07 00:53:33,264 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 00:53:33,264 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 00:53:33,277 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 00:53:33,278 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:53:33,281 INFO L87 Difference]: Start difference. First operand has 264 states, 261 states have (on average 1.5517241379310345) internal successors, (405), 263 states have internal predecessors, (405), 0 states have call successors, (0), 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 9.333333333333334) internal successors, (28), 2 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:33,400 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:53:33,400 INFO L93 Difference]: Finished difference Result 747 states and 1143 transitions. [2021-11-07 00:53:33,401 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 00:53:33,402 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 9.333333333333334) internal successors, (28), 2 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2021-11-07 00:53:33,403 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:53:33,418 INFO L225 Difference]: With dead ends: 747 [2021-11-07 00:53:33,418 INFO L226 Difference]: Without dead ends: 481 [2021-11-07 00:53:33,422 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:53:33,440 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 481 states. [2021-11-07 00:53:33,489 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 481 to 459. [2021-11-07 00:53:33,495 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 459 states, 457 states have (on average 1.5032822757111597) internal successors, (687), 458 states have internal predecessors, (687), 0 states have call successors, (0), 0 states 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 00:53:33,502 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 459 states to 459 states and 687 transitions. [2021-11-07 00:53:33,504 INFO L78 Accepts]: Start accepts. Automaton has 459 states and 687 transitions. Word has length 28 [2021-11-07 00:53:33,504 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:53:33,504 INFO L470 AbstractCegarLoop]: Abstraction has 459 states and 687 transitions. [2021-11-07 00:53:33,505 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 9.333333333333334) internal successors, (28), 2 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:33,505 INFO L276 IsEmpty]: Start isEmpty. Operand 459 states and 687 transitions. [2021-11-07 00:53:33,515 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-11-07 00:53:33,516 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:53:33,516 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:53:33,517 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-07 00:53:33,517 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:53:33,520 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:53:33,520 INFO L85 PathProgramCache]: Analyzing trace with hash 1659813095, now seen corresponding path program 1 times [2021-11-07 00:53:33,521 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 00:53:33,521 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [788877314] [2021-11-07 00:53:33,521 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:53:33,522 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 00:53:33,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:53:33,618 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-07 00:53:33,618 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 00:53:33,619 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [788877314] [2021-11-07 00:53:33,619 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [788877314] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 00:53:33,619 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:53:33,620 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 00:53:33,620 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1006901872] [2021-11-07 00:53:33,621 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 00:53:33,622 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 00:53:33,622 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 00:53:33,623 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:53:33,623 INFO L87 Difference]: Start difference. First operand 459 states and 687 transitions. Second operand has 4 states, 4 states have (on average 13.25) 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 00:53:33,836 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:53:33,836 INFO L93 Difference]: Finished difference Result 1501 states and 2235 transitions. [2021-11-07 00:53:33,837 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 00:53:33,838 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 13.25) 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 57 [2021-11-07 00:53:33,838 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:53:33,845 INFO L225 Difference]: With dead ends: 1501 [2021-11-07 00:53:33,845 INFO L226 Difference]: Without dead ends: 1051 [2021-11-07 00:53:33,850 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-07 00:53:33,852 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1051 states. [2021-11-07 00:53:33,909 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1051 to 827. [2021-11-07 00:53:33,911 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 827 states, 825 states have (on average 1.4824242424242424) internal successors, (1223), 826 states have internal predecessors, (1223), 0 states have call successors, (0), 0 states 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 00:53:33,914 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 827 states to 827 states and 1223 transitions. [2021-11-07 00:53:33,915 INFO L78 Accepts]: Start accepts. Automaton has 827 states and 1223 transitions. Word has length 57 [2021-11-07 00:53:33,915 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:53:33,916 INFO L470 AbstractCegarLoop]: Abstraction has 827 states and 1223 transitions. [2021-11-07 00:53:33,917 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 13.25) 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 00:53:33,917 INFO L276 IsEmpty]: Start isEmpty. Operand 827 states and 1223 transitions. [2021-11-07 00:53:33,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-11-07 00:53:33,942 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:53:33,942 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:53:33,943 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-07 00:53:33,943 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:53:33,944 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:53:33,944 INFO L85 PathProgramCache]: Analyzing trace with hash -2128127993, now seen corresponding path program 1 times [2021-11-07 00:53:33,945 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 00:53:33,948 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [57213386] [2021-11-07 00:53:33,948 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:53:33,950 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 00:53:33,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:53:34,066 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-07 00:53:34,067 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 00:53:34,067 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [57213386] [2021-11-07 00:53:34,068 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [57213386] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 00:53:34,068 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:53:34,074 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 00:53:34,075 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1491514789] [2021-11-07 00:53:34,076 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 00:53:34,076 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 00:53:34,077 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 00:53:34,077 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:53:34,077 INFO L87 Difference]: Start difference. First operand 827 states and 1223 transitions. Second operand has 4 states, 4 states have (on average 13.25) 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 00:53:34,265 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:53:34,265 INFO L93 Difference]: Finished difference Result 2700 states and 3970 transitions. [2021-11-07 00:53:34,266 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 00:53:34,266 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 13.25) 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 57 [2021-11-07 00:53:34,266 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:53:34,280 INFO L225 Difference]: With dead ends: 2700 [2021-11-07 00:53:34,280 INFO L226 Difference]: Without dead ends: 1889 [2021-11-07 00:53:34,282 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-07 00:53:34,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1889 states. [2021-11-07 00:53:34,342 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1889 to 1506. [2021-11-07 00:53:34,345 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1506 states, 1504 states have (on average 1.461436170212766) internal successors, (2198), 1505 states have internal predecessors, (2198), 0 states have call successors, (0), 0 states 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 00:53:34,352 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1506 states to 1506 states and 2198 transitions. [2021-11-07 00:53:34,352 INFO L78 Accepts]: Start accepts. Automaton has 1506 states and 2198 transitions. Word has length 57 [2021-11-07 00:53:34,352 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:53:34,353 INFO L470 AbstractCegarLoop]: Abstraction has 1506 states and 2198 transitions. [2021-11-07 00:53:34,353 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 13.25) 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 00:53:34,353 INFO L276 IsEmpty]: Start isEmpty. Operand 1506 states and 2198 transitions. [2021-11-07 00:53:34,357 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-11-07 00:53:34,357 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:53:34,357 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:53:34,357 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-07 00:53:34,358 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:53:34,358 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:53:34,359 INFO L85 PathProgramCache]: Analyzing trace with hash 891736614, now seen corresponding path program 1 times [2021-11-07 00:53:34,359 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 00:53:34,359 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1693131454] [2021-11-07 00:53:34,359 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:53:34,360 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 00:53:34,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:53:34,502 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:53:34,502 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 00:53:34,503 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1693131454] [2021-11-07 00:53:34,503 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1693131454] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 00:53:34,503 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:53:34,503 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 00:53:34,504 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1803248406] [2021-11-07 00:53:34,504 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 00:53:34,504 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 00:53:34,505 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 00:53:34,505 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:53:34,506 INFO L87 Difference]: Start difference. First operand 1506 states and 2198 transitions. Second operand has 4 states, 4 states have (on average 14.25) internal successors, (57), 3 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 00:53:34,769 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:53:34,769 INFO L93 Difference]: Finished difference Result 4981 states and 7219 transitions. [2021-11-07 00:53:34,770 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 00:53:34,770 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.25) internal successors, (57), 3 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 00:53:34,770 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:53:34,790 INFO L225 Difference]: With dead ends: 4981 [2021-11-07 00:53:34,791 INFO L226 Difference]: Without dead ends: 3487 [2021-11-07 00:53:34,794 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-07 00:53:34,798 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3487 states. [2021-11-07 00:53:34,927 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3487 to 2753. [2021-11-07 00:53:34,933 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2753 states, 2751 states have (on average 1.440567066521265) internal successors, (3963), 2752 states have internal predecessors, (3963), 0 states have call successors, (0), 0 states 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 00:53:34,945 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2753 states to 2753 states and 3963 transitions. [2021-11-07 00:53:34,945 INFO L78 Accepts]: Start accepts. Automaton has 2753 states and 3963 transitions. Word has length 57 [2021-11-07 00:53:34,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:53:34,946 INFO L470 AbstractCegarLoop]: Abstraction has 2753 states and 3963 transitions. [2021-11-07 00:53:34,946 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.25) internal successors, (57), 3 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 00:53:34,946 INFO L276 IsEmpty]: Start isEmpty. Operand 2753 states and 3963 transitions. [2021-11-07 00:53:34,950 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-11-07 00:53:34,950 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:53:34,951 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:53:34,951 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-07 00:53:34,951 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:53:34,951 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:53:34,952 INFO L85 PathProgramCache]: Analyzing trace with hash 778349957, now seen corresponding path program 1 times [2021-11-07 00:53:34,952 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 00:53:34,952 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1398697188] [2021-11-07 00:53:34,952 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:53:34,953 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 00:53:34,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:53:35,056 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:53:35,056 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 00:53:35,057 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1398697188] [2021-11-07 00:53:35,057 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1398697188] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 00:53:35,057 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:53:35,057 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 00:53:35,057 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2021993553] [2021-11-07 00:53:35,059 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 00:53:35,059 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 00:53:35,060 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 00:53:35,060 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:53:35,060 INFO L87 Difference]: Start difference. First operand 2753 states and 3963 transitions. Second operand has 3 states, 3 states have (on average 19.0) internal successors, (57), 3 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 00:53:35,298 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:53:35,298 INFO L93 Difference]: Finished difference Result 7819 states and 11233 transitions. [2021-11-07 00:53:35,299 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 00:53:35,299 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 19.0) internal successors, (57), 3 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 00:53:35,299 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:53:35,331 INFO L225 Difference]: With dead ends: 7819 [2021-11-07 00:53:35,331 INFO L226 Difference]: Without dead ends: 5084 [2021-11-07 00:53:35,338 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 00:53:35,345 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5084 states. [2021-11-07 00:53:35,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5084 to 5032. [2021-11-07 00:53:35,574 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5032 states, 5030 states have (on average 1.4202783300198807) internal successors, (7144), 5031 states have internal predecessors, (7144), 0 states have call successors, (0), 0 states 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 00:53:35,595 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5032 states to 5032 states and 7144 transitions. [2021-11-07 00:53:35,595 INFO L78 Accepts]: Start accepts. Automaton has 5032 states and 7144 transitions. Word has length 57 [2021-11-07 00:53:35,596 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:53:35,596 INFO L470 AbstractCegarLoop]: Abstraction has 5032 states and 7144 transitions. [2021-11-07 00:53:35,596 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 19.0) internal successors, (57), 3 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 00:53:35,596 INFO L276 IsEmpty]: Start isEmpty. Operand 5032 states and 7144 transitions. [2021-11-07 00:53:35,602 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-11-07 00:53:35,602 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:53:35,603 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:53:35,603 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-07 00:53:35,603 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:53:35,603 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:53:35,604 INFO L85 PathProgramCache]: Analyzing trace with hash 1954954276, now seen corresponding path program 1 times [2021-11-07 00:53:35,604 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 00:53:35,604 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [688024614] [2021-11-07 00:53:35,604 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:53:35,605 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 00:53:35,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:53:35,710 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:53:35,712 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 00:53:35,713 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [688024614] [2021-11-07 00:53:35,713 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [688024614] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 00:53:35,713 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:53:35,713 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 00:53:35,714 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2121920086] [2021-11-07 00:53:35,714 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 00:53:35,714 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 00:53:35,716 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 00:53:35,717 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:53:35,717 INFO L87 Difference]: Start difference. First operand 5032 states and 7144 transitions. Second operand has 3 states, 3 states have (on average 19.0) internal successors, (57), 3 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 00:53:35,959 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:53:35,960 INFO L93 Difference]: Finished difference Result 8508 states and 12314 transitions. [2021-11-07 00:53:35,960 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 00:53:35,961 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 19.0) internal successors, (57), 3 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 00:53:35,963 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:53:35,995 INFO L225 Difference]: With dead ends: 8508 [2021-11-07 00:53:35,996 INFO L226 Difference]: Without dead ends: 5720 [2021-11-07 00:53:36,001 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 00:53:36,009 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5720 states. [2021-11-07 00:53:36,240 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5720 to 5448. [2021-11-07 00:53:36,252 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5448 states, 5446 states have (on average 1.4439955930958501) internal successors, (7864), 5447 states have internal predecessors, (7864), 0 states have call successors, (0), 0 states 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 00:53:36,273 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5448 states to 5448 states and 7864 transitions. [2021-11-07 00:53:36,273 INFO L78 Accepts]: Start accepts. Automaton has 5448 states and 7864 transitions. Word has length 57 [2021-11-07 00:53:36,273 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:53:36,274 INFO L470 AbstractCegarLoop]: Abstraction has 5448 states and 7864 transitions. [2021-11-07 00:53:36,274 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 19.0) internal successors, (57), 3 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 00:53:36,274 INFO L276 IsEmpty]: Start isEmpty. Operand 5448 states and 7864 transitions. [2021-11-07 00:53:36,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-07 00:53:36,285 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:53:36,285 INFO L513 BasicCegarLoop]: trace histogram [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] [2021-11-07 00:53:36,285 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-07 00:53:36,286 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:53:36,286 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:53:36,286 INFO L85 PathProgramCache]: Analyzing trace with hash -287476627, now seen corresponding path program 1 times [2021-11-07 00:53:36,286 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 00:53:36,287 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1709727795] [2021-11-07 00:53:36,287 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:53:36,287 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 00:53:36,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:53:36,361 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:53:36,362 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 00:53:36,363 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1709727795] [2021-11-07 00:53:36,364 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1709727795] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 00:53:36,364 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:53:36,364 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-07 00:53:36,364 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [428772504] [2021-11-07 00:53:36,365 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 00:53:36,366 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 00:53:36,366 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 00:53:36,366 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:53:36,367 INFO L87 Difference]: Start difference. First operand 5448 states and 7864 transitions. Second operand has 3 states, 3 states have (on average 26.333333333333332) internal successors, (79), 2 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 00:53:36,793 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:53:36,793 INFO L93 Difference]: Finished difference Result 15438 states and 22266 transitions. [2021-11-07 00:53:36,794 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 00:53:36,794 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 26.333333333333332) internal successors, (79), 2 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 79 [2021-11-07 00:53:36,794 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:53:36,853 INFO L225 Difference]: With dead ends: 15438 [2021-11-07 00:53:36,854 INFO L226 Difference]: Without dead ends: 9995 [2021-11-07 00:53:36,864 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:53:36,878 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9995 states. [2021-11-07 00:53:37,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9995 to 9943. [2021-11-07 00:53:37,313 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9943 states, 9941 states have (on average 1.4249069510109647) internal successors, (14165), 9942 states have internal predecessors, (14165), 0 states have call successors, (0), 0 states 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 00:53:37,343 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9943 states to 9943 states and 14165 transitions. [2021-11-07 00:53:37,343 INFO L78 Accepts]: Start accepts. Automaton has 9943 states and 14165 transitions. Word has length 79 [2021-11-07 00:53:37,343 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:53:37,343 INFO L470 AbstractCegarLoop]: Abstraction has 9943 states and 14165 transitions. [2021-11-07 00:53:37,344 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 26.333333333333332) internal successors, (79), 2 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 00:53:37,344 INFO L276 IsEmpty]: Start isEmpty. Operand 9943 states and 14165 transitions. [2021-11-07 00:53:37,364 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-11-07 00:53:37,364 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:53:37,364 INFO L513 BasicCegarLoop]: trace histogram [3, 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] [2021-11-07 00:53:37,365 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-07 00:53:37,365 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:53:37,365 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:53:37,366 INFO L85 PathProgramCache]: Analyzing trace with hash 1105615019, now seen corresponding path program 1 times [2021-11-07 00:53:37,366 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 00:53:37,366 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1055305843] [2021-11-07 00:53:37,366 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:53:37,366 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 00:53:37,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:53:37,440 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-07 00:53:37,441 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 00:53:37,441 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1055305843] [2021-11-07 00:53:37,441 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1055305843] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 00:53:37,442 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:53:37,442 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 00:53:37,442 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1789513615] [2021-11-07 00:53:37,442 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 00:53:37,443 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 00:53:37,443 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 00:53:37,443 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:53:37,444 INFO L87 Difference]: Start difference. First operand 9943 states and 14165 transitions. Second operand has 4 states, 4 states have (on average 20.25) internal successors, (81), 3 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:38,241 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:53:38,242 INFO L93 Difference]: Finished difference Result 28579 states and 40875 transitions. [2021-11-07 00:53:38,242 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 00:53:38,242 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 20.25) internal successors, (81), 3 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 82 [2021-11-07 00:53:38,243 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:53:38,300 INFO L225 Difference]: With dead ends: 28579 [2021-11-07 00:53:38,300 INFO L226 Difference]: Without dead ends: 18655 [2021-11-07 00:53:38,324 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:53:38,349 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18655 states. [2021-11-07 00:53:38,930 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18655 to 14487. [2021-11-07 00:53:38,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14487 states, 14485 states have (on average 1.426372109078357) internal successors, (20661), 14486 states have internal predecessors, (20661), 0 states have call successors, (0), 0 states 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 00:53:39,002 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14487 states to 14487 states and 20661 transitions. [2021-11-07 00:53:39,002 INFO L78 Accepts]: Start accepts. Automaton has 14487 states and 20661 transitions. Word has length 82 [2021-11-07 00:53:39,002 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:53:39,002 INFO L470 AbstractCegarLoop]: Abstraction has 14487 states and 20661 transitions. [2021-11-07 00:53:39,003 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 20.25) internal successors, (81), 3 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:39,003 INFO L276 IsEmpty]: Start isEmpty. Operand 14487 states and 20661 transitions. [2021-11-07 00:53:39,038 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-11-07 00:53:39,038 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:53:39,038 INFO L513 BasicCegarLoop]: trace histogram [3, 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 00:53:39,039 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-07 00:53:39,039 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:53:39,040 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:53:39,040 INFO L85 PathProgramCache]: Analyzing trace with hash 1476718537, now seen corresponding path program 1 times [2021-11-07 00:53:39,040 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 00:53:39,040 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1448472838] [2021-11-07 00:53:39,041 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:53:39,041 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 00:53:39,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:53:39,140 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-07 00:53:39,140 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 00:53:39,141 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1448472838] [2021-11-07 00:53:39,141 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1448472838] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 00:53:39,143 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:53:39,146 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 00:53:39,147 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1235072659] [2021-11-07 00:53:39,147 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 00:53:39,148 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 00:53:39,148 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 00:53:39,148 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:53:39,149 INFO L87 Difference]: Start difference. First operand 14487 states and 20661 transitions. Second operand has 4 states, 4 states have (on average 20.5) internal successors, (82), 3 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:40,529 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:53:40,529 INFO L93 Difference]: Finished difference Result 50943 states and 73087 transitions. [2021-11-07 00:53:40,536 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 00:53:40,537 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 20.5) internal successors, (82), 3 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 83 [2021-11-07 00:53:40,544 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:53:40,650 INFO L225 Difference]: With dead ends: 50943 [2021-11-07 00:53:40,650 INFO L226 Difference]: Without dead ends: 36475 [2021-11-07 00:53:40,673 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:53:40,713 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36475 states. [2021-11-07 00:53:41,935 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36475 to 27407. [2021-11-07 00:53:41,973 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27407 states, 27405 states have (on average 1.4194854953475644) internal successors, (38901), 27406 states have internal predecessors, (38901), 0 states have call successors, (0), 0 states 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 00:53:42,048 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27407 states to 27407 states and 38901 transitions. [2021-11-07 00:53:42,048 INFO L78 Accepts]: Start accepts. Automaton has 27407 states and 38901 transitions. Word has length 83 [2021-11-07 00:53:42,049 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:53:42,049 INFO L470 AbstractCegarLoop]: Abstraction has 27407 states and 38901 transitions. [2021-11-07 00:53:42,049 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 20.5) internal successors, (82), 3 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:42,049 INFO L276 IsEmpty]: Start isEmpty. Operand 27407 states and 38901 transitions. [2021-11-07 00:53:42,106 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-11-07 00:53:42,106 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:53:42,107 INFO L513 BasicCegarLoop]: trace histogram [3, 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 00:53:42,107 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-07 00:53:42,107 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:53:42,108 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:53:42,108 INFO L85 PathProgramCache]: Analyzing trace with hash -609415248, now seen corresponding path program 1 times [2021-11-07 00:53:42,109 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 00:53:42,110 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1766871381] [2021-11-07 00:53:42,110 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:53:42,111 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 00:53:42,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:53:42,200 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-07 00:53:42,201 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 00:53:42,201 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1766871381] [2021-11-07 00:53:42,201 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1766871381] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 00:53:42,201 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:53:42,201 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 00:53:42,202 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [940548092] [2021-11-07 00:53:42,202 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 00:53:42,202 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 00:53:42,203 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 00:53:42,203 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:53:42,203 INFO L87 Difference]: Start difference. First operand 27407 states and 38901 transitions. Second operand has 4 states, 4 states have (on average 20.75) internal successors, (83), 3 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) [2021-11-07 00:53:44,441 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:53:44,441 INFO L93 Difference]: Finished difference Result 98191 states and 139871 transitions. [2021-11-07 00:53:44,442 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 00:53:44,442 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 20.75) internal successors, (83), 3 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) Word has length 84 [2021-11-07 00:53:44,443 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:53:44,617 INFO L225 Difference]: With dead ends: 98191 [2021-11-07 00:53:44,618 INFO L226 Difference]: Without dead ends: 70803 [2021-11-07 00:53:44,661 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:53:44,735 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70803 states. [2021-11-07 00:53:46,687 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70803 to 51703. [2021-11-07 00:53:46,730 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51703 states, 51701 states have (on average 1.4115974545946888) internal successors, (72981), 51702 states have internal predecessors, (72981), 0 states have call successors, (0), 0 states 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 00:53:46,867 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51703 states to 51703 states and 72981 transitions. [2021-11-07 00:53:46,867 INFO L78 Accepts]: Start accepts. Automaton has 51703 states and 72981 transitions. Word has length 84 [2021-11-07 00:53:46,867 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:53:46,867 INFO L470 AbstractCegarLoop]: Abstraction has 51703 states and 72981 transitions. [2021-11-07 00:53:46,868 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 20.75) internal successors, (83), 3 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) [2021-11-07 00:53:46,868 INFO L276 IsEmpty]: Start isEmpty. Operand 51703 states and 72981 transitions. [2021-11-07 00:53:46,997 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-11-07 00:53:46,997 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:53:46,997 INFO L513 BasicCegarLoop]: trace histogram [3, 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] [2021-11-07 00:53:46,998 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-07 00:53:46,998 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:53:46,998 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:53:46,999 INFO L85 PathProgramCache]: Analyzing trace with hash -364577463, now seen corresponding path program 1 times [2021-11-07 00:53:46,999 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 00:53:47,001 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1370239355] [2021-11-07 00:53:47,001 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:53:47,002 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 00:53:47,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:53:47,101 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-07 00:53:47,102 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 00:53:47,102 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1370239355] [2021-11-07 00:53:47,102 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1370239355] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 00:53:47,102 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:53:47,102 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 00:53:47,103 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2119117026] [2021-11-07 00:53:47,103 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 00:53:47,103 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 00:53:47,105 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 00:53:47,105 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:53:47,105 INFO L87 Difference]: Start difference. First operand 51703 states and 72981 transitions. Second operand has 4 states, 4 states have (on average 21.0) internal successors, (84), 3 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:51,448 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:53:51,448 INFO L93 Difference]: Finished difference Result 186403 states and 263707 transitions. [2021-11-07 00:53:51,448 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 00:53:51,449 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 21.0) internal successors, (84), 3 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 85 [2021-11-07 00:53:51,449 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:53:51,904 INFO L225 Difference]: With dead ends: 186403 [2021-11-07 00:53:51,904 INFO L226 Difference]: Without dead ends: 134719 [2021-11-07 00:53:51,977 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:53:52,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134719 states. [2021-11-07 00:53:55,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134719 to 97207. [2021-11-07 00:53:55,443 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97207 states, 97205 states have (on average 1.4026130343089347) internal successors, (136341), 97206 states have internal predecessors, (136341), 0 states have call successors, (0), 0 states 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 00:53:55,931 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97207 states to 97207 states and 136341 transitions. [2021-11-07 00:53:55,932 INFO L78 Accepts]: Start accepts. Automaton has 97207 states and 136341 transitions. Word has length 85 [2021-11-07 00:53:55,932 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:53:55,932 INFO L470 AbstractCegarLoop]: Abstraction has 97207 states and 136341 transitions. [2021-11-07 00:53:55,932 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 21.0) internal successors, (84), 3 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:55,933 INFO L276 IsEmpty]: Start isEmpty. Operand 97207 states and 136341 transitions. [2021-11-07 00:53:56,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-11-07 00:53:56,061 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:53:56,062 INFO L513 BasicCegarLoop]: trace histogram [3, 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] [2021-11-07 00:53:56,062 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-11-07 00:53:56,062 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:53:56,062 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:53:56,063 INFO L85 PathProgramCache]: Analyzing trace with hash 1047543211, now seen corresponding path program 1 times [2021-11-07 00:53:56,063 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 00:53:56,063 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [412321392] [2021-11-07 00:53:56,064 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:53:56,064 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 00:53:56,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:53:56,159 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:53:56,159 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 00:53:56,160 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [412321392] [2021-11-07 00:53:56,161 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [412321392] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 00:53:56,161 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:53:56,162 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-07 00:53:56,163 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [27031869] [2021-11-07 00:53:56,163 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-07 00:53:56,163 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 00:53:56,164 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-07 00:53:56,165 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-07 00:53:56,165 INFO L87 Difference]: Start difference. First operand 97207 states and 136341 transitions. Second operand has 5 states, 5 states have (on average 17.2) internal successors, (86), 5 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:59,442 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:53:59,443 INFO L93 Difference]: Finished difference Result 177689 states and 251112 transitions. [2021-11-07 00:53:59,443 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-07 00:53:59,443 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 17.2) internal successors, (86), 5 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 86 [2021-11-07 00:53:59,443 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:53:59,554 INFO L225 Difference]: With dead ends: 177689 [2021-11-07 00:53:59,554 INFO L226 Difference]: Without dead ends: 80501 [2021-11-07 00:53:59,607 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2021-11-07 00:53:59,656 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80501 states. [2021-11-07 00:54:02,329 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80501 to 72736. [2021-11-07 00:54:02,393 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72736 states, 72734 states have (on average 1.432974949817142) internal successors, (104226), 72735 states have internal predecessors, (104226), 0 states have call successors, (0), 0 states 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 00:54:02,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72736 states to 72736 states and 104226 transitions. [2021-11-07 00:54:02,733 INFO L78 Accepts]: Start accepts. Automaton has 72736 states and 104226 transitions. Word has length 86 [2021-11-07 00:54:02,733 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:54:02,733 INFO L470 AbstractCegarLoop]: Abstraction has 72736 states and 104226 transitions. [2021-11-07 00:54:02,734 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 17.2) internal successors, (86), 5 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:54:02,734 INFO L276 IsEmpty]: Start isEmpty. Operand 72736 states and 104226 transitions. [2021-11-07 00:54:02,826 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-11-07 00:54:02,826 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:54:02,826 INFO L513 BasicCegarLoop]: trace histogram [3, 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, 1] [2021-11-07 00:54:02,826 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-11-07 00:54:02,827 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:54:02,827 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:54:02,827 INFO L85 PathProgramCache]: Analyzing trace with hash 1888556691, now seen corresponding path program 1 times [2021-11-07 00:54:02,827 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 00:54:02,828 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1827974532] [2021-11-07 00:54:02,828 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:54:02,828 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 00:54:02,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:54:02,879 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:54:02,880 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 00:54:02,880 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1827974532] [2021-11-07 00:54:02,880 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1827974532] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 00:54:02,880 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:54:02,881 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 00:54:02,881 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [665670908] [2021-11-07 00:54:02,881 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 00:54:02,881 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 00:54:02,882 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 00:54:02,882 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:54:02,882 INFO L87 Difference]: Start difference. First operand 72736 states and 104226 transitions. Second operand has 3 states, 3 states have (on average 29.333333333333332) internal successors, (88), 3 states have internal predecessors, (88), 0 states have call successors, (0), 0 states 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 00:54:05,638 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:54:05,639 INFO L93 Difference]: Finished difference Result 127961 states and 183447 transitions. [2021-11-07 00:54:05,645 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 00:54:05,645 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 29.333333333333332) internal successors, (88), 3 states have internal predecessors, (88), 0 states have call successors, (0), 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 88 [2021-11-07 00:54:05,645 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:54:05,782 INFO L225 Difference]: With dead ends: 127961 [2021-11-07 00:54:05,782 INFO L226 Difference]: Without dead ends: 72981 [2021-11-07 00:54:05,827 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 00:54:05,882 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72981 states. [2021-11-07 00:54:08,511 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72981 to 72480. [2021-11-07 00:54:08,559 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72480 states, 72478 states have (on average 1.4009492535665995) internal successors, (101538), 72479 states have internal predecessors, (101538), 0 states have call successors, (0), 0 states 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 00:54:08,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72480 states to 72480 states and 101538 transitions. [2021-11-07 00:54:08,691 INFO L78 Accepts]: Start accepts. Automaton has 72480 states and 101538 transitions. Word has length 88 [2021-11-07 00:54:08,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:54:08,692 INFO L470 AbstractCegarLoop]: Abstraction has 72480 states and 101538 transitions. [2021-11-07 00:54:08,692 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 29.333333333333332) internal successors, (88), 3 states have internal predecessors, (88), 0 states have call successors, (0), 0 states 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 00:54:08,692 INFO L276 IsEmpty]: Start isEmpty. Operand 72480 states and 101538 transitions. [2021-11-07 00:54:08,772 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-11-07 00:54:08,772 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:54:08,773 INFO L513 BasicCegarLoop]: trace histogram [3, 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, 1] [2021-11-07 00:54:08,773 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-11-07 00:54:08,773 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:54:08,774 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:54:08,774 INFO L85 PathProgramCache]: Analyzing trace with hash -733892974, now seen corresponding path program 1 times [2021-11-07 00:54:08,774 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 00:54:08,774 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [875936974] [2021-11-07 00:54:08,775 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:54:08,775 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 00:54:08,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:54:08,832 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:54:08,833 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 00:54:08,833 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [875936974] [2021-11-07 00:54:08,833 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [875936974] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 00:54:08,833 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:54:08,834 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-07 00:54:08,834 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [578409996] [2021-11-07 00:54:08,834 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-07 00:54:08,834 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 00:54:08,835 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-07 00:54:08,835 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-07 00:54:08,835 INFO L87 Difference]: Start difference. First operand 72480 states and 101538 transitions. Second operand has 5 states, 5 states have (on average 17.6) internal successors, (88), 5 states have internal predecessors, (88), 0 states have call successors, (0), 0 states 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 00:54:11,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:54:11,875 INFO L93 Difference]: Finished difference Result 128569 states and 179319 transitions. [2021-11-07 00:54:11,875 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-07 00:54:11,876 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 17.6) internal successors, (88), 5 states have internal predecessors, (88), 0 states have call successors, (0), 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 88 [2021-11-07 00:54:11,876 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:54:11,987 INFO L225 Difference]: With dead ends: 128569 [2021-11-07 00:54:11,987 INFO L226 Difference]: Without dead ends: 73973 [2021-11-07 00:54:12,021 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2021-11-07 00:54:12,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73973 states. [2021-11-07 00:54:14,545 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73973 to 66336. [2021-11-07 00:54:14,594 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66336 states, 66334 states have (on average 1.4101064310911449) internal successors, (93538), 66335 states have internal predecessors, (93538), 0 states have call successors, (0), 0 states 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 00:54:14,844 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66336 states to 66336 states and 93538 transitions. [2021-11-07 00:54:14,844 INFO L78 Accepts]: Start accepts. Automaton has 66336 states and 93538 transitions. Word has length 88 [2021-11-07 00:54:14,844 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:54:14,845 INFO L470 AbstractCegarLoop]: Abstraction has 66336 states and 93538 transitions. [2021-11-07 00:54:14,845 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 17.6) internal successors, (88), 5 states have internal predecessors, (88), 0 states have call successors, (0), 0 states 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 00:54:14,845 INFO L276 IsEmpty]: Start isEmpty. Operand 66336 states and 93538 transitions. [2021-11-07 00:54:14,928 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2021-11-07 00:54:14,928 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:54:14,928 INFO L513 BasicCegarLoop]: trace histogram [3, 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, 1, 1, 1] [2021-11-07 00:54:14,928 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-11-07 00:54:14,929 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:54:14,929 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:54:14,929 INFO L85 PathProgramCache]: Analyzing trace with hash 587077185, now seen corresponding path program 1 times [2021-11-07 00:54:14,929 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 00:54:14,930 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [813536065] [2021-11-07 00:54:14,930 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:54:14,930 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 00:54:14,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:54:14,991 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:54:14,991 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 00:54:14,991 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [813536065] [2021-11-07 00:54:14,992 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [813536065] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 00:54:14,992 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:54:14,992 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-07 00:54:14,992 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2053245284] [2021-11-07 00:54:14,993 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 00:54:14,993 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 00:54:14,993 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 00:54:14,994 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-07 00:54:14,994 INFO L87 Difference]: Start difference. First operand 66336 states and 93538 transitions. Second operand has 6 states, 6 states have (on average 15.0) internal successors, (90), 6 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)