./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/systemc/toy2.cil.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 839c364b Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6218d98e-706e-434d-a3c4-2feaa79f0b28/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6218d98e-706e-434d-a3c4-2feaa79f0b28/bin/utaipan-eEHZpOm5b7/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6218d98e-706e-434d-a3c4-2feaa79f0b28/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6218d98e-706e-434d-a3c4-2feaa79f0b28/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/systemc/toy2.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6218d98e-706e-434d-a3c4-2feaa79f0b28/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6218d98e-706e-434d-a3c4-2feaa79f0b28/bin/utaipan-eEHZpOm5b7 --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 a77d6f304c19846fdc8cd5bba9216d69953659ded966cffbf7faa285e2d864a4 --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 18:42:10,693 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 18:42:10,697 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 18:42:10,758 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 18:42:10,759 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 18:42:10,765 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 18:42:10,767 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 18:42:10,770 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 18:42:10,772 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 18:42:10,773 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 18:42:10,774 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 18:42:10,776 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 18:42:10,776 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 18:42:10,778 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 18:42:10,780 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 18:42:10,781 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 18:42:10,782 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 18:42:10,786 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 18:42:10,789 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 18:42:10,791 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 18:42:10,793 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 18:42:10,796 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 18:42:10,803 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 18:42:10,804 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 18:42:10,814 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 18:42:10,815 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 18:42:10,815 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 18:42:10,816 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 18:42:10,817 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 18:42:10,818 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 18:42:10,818 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 18:42:10,819 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 18:42:10,820 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 18:42:10,826 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 18:42:10,829 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 18:42:10,829 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 18:42:10,830 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 18:42:10,830 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 18:42:10,830 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 18:42:10,831 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 18:42:10,832 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 18:42:10,833 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6218d98e-706e-434d-a3c4-2feaa79f0b28/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-25 18:42:10,883 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 18:42:10,884 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 18:42:10,892 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 18:42:10,892 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 18:42:10,893 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 18:42:10,893 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 18:42:10,894 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 18:42:10,894 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 18:42:10,894 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 18:42:10,894 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 18:42:10,896 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 18:42:10,896 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 18:42:10,896 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 18:42:10,896 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 18:42:10,897 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 18:42:10,897 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 18:42:10,897 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 18:42:10,897 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 18:42:10,898 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 18:42:10,898 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 18:42:10,899 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 18:42:10,899 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 18:42:10,899 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 18:42:10,899 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 18:42:10,900 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 18:42:10,900 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 18:42:10,900 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 18:42:10,900 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 18:42:10,900 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 18:42:10,901 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 18:42:10,901 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 18:42:10,901 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 18:42:10,902 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 18:42:10,902 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 18:42:10,902 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 18:42:10,902 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 18:42:10,903 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 18:42:10,903 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 18:42:10,903 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 18:42:10,903 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 18:42:10,903 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 18:42:10,904 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_6218d98e-706e-434d-a3c4-2feaa79f0b28/bin/utaipan-eEHZpOm5b7/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6218d98e-706e-434d-a3c4-2feaa79f0b28/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> a77d6f304c19846fdc8cd5bba9216d69953659ded966cffbf7faa285e2d864a4 [2021-11-25 18:42:11,270 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 18:42:11,296 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 18:42:11,300 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 18:42:11,301 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 18:42:11,302 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 18:42:11,304 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6218d98e-706e-434d-a3c4-2feaa79f0b28/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/systemc/toy2.cil.c [2021-11-25 18:42:11,394 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6218d98e-706e-434d-a3c4-2feaa79f0b28/bin/utaipan-eEHZpOm5b7/data/2c56cfae8/24d920bb6d7b4da9b80367c51fce8678/FLAG98871238a [2021-11-25 18:42:12,097 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 18:42:12,109 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6218d98e-706e-434d-a3c4-2feaa79f0b28/sv-benchmarks/c/systemc/toy2.cil.c [2021-11-25 18:42:12,129 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6218d98e-706e-434d-a3c4-2feaa79f0b28/bin/utaipan-eEHZpOm5b7/data/2c56cfae8/24d920bb6d7b4da9b80367c51fce8678/FLAG98871238a [2021-11-25 18:42:12,410 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6218d98e-706e-434d-a3c4-2feaa79f0b28/bin/utaipan-eEHZpOm5b7/data/2c56cfae8/24d920bb6d7b4da9b80367c51fce8678 [2021-11-25 18:42:12,413 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 18:42:12,416 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 18:42:12,418 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 18:42:12,418 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 18:42:12,433 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 18:42:12,434 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 06:42:12" (1/1) ... [2021-11-25 18:42:12,436 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4f8f1191 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:42:12, skipping insertion in model container [2021-11-25 18:42:12,436 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 06:42:12" (1/1) ... [2021-11-25 18:42:12,444 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 18:42:12,511 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 18:42:12,744 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6218d98e-706e-434d-a3c4-2feaa79f0b28/sv-benchmarks/c/systemc/toy2.cil.c[698,711] [2021-11-25 18:42:12,864 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 18:42:12,884 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 18:42:12,902 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6218d98e-706e-434d-a3c4-2feaa79f0b28/sv-benchmarks/c/systemc/toy2.cil.c[698,711] [2021-11-25 18:42:12,952 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 18:42:12,970 INFO L208 MainTranslator]: Completed translation [2021-11-25 18:42:12,970 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:42:12 WrapperNode [2021-11-25 18:42:12,971 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 18:42:12,972 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 18:42:12,972 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 18:42:12,972 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 18:42:12,983 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:42:12" (1/1) ... [2021-11-25 18:42:13,007 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:42:12" (1/1) ... [2021-11-25 18:42:13,042 INFO L137 Inliner]: procedures = 20, calls = 15, calls flagged for inlining = 10, calls inlined = 10, statements flattened = 361 [2021-11-25 18:42:13,043 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 18:42:13,044 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 18:42:13,044 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 18:42:13,044 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 18:42:13,058 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:42:12" (1/1) ... [2021-11-25 18:42:13,058 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:42:12" (1/1) ... [2021-11-25 18:42:13,075 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:42:12" (1/1) ... [2021-11-25 18:42:13,075 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:42:12" (1/1) ... [2021-11-25 18:42:13,089 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:42:12" (1/1) ... [2021-11-25 18:42:13,114 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:42:12" (1/1) ... [2021-11-25 18:42:13,115 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:42:12" (1/1) ... [2021-11-25 18:42:13,119 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 18:42:13,120 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 18:42:13,120 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 18:42:13,120 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 18:42:13,129 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:42:12" (1/1) ... [2021-11-25 18:42:13,140 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 18:42:13,153 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6218d98e-706e-434d-a3c4-2feaa79f0b28/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:42:13,169 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6218d98e-706e-434d-a3c4-2feaa79f0b28/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 18:42:13,198 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6218d98e-706e-434d-a3c4-2feaa79f0b28/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 18:42:13,239 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 18:42:13,240 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 18:42:13,240 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 18:42:13,240 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 18:42:13,324 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 18:42:13,326 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 18:42:13,787 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 18:42:14,114 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 18:42:14,114 INFO L301 CfgBuilder]: Removed 6 assume(true) statements. [2021-11-25 18:42:14,117 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 06:42:14 BoogieIcfgContainer [2021-11-25 18:42:14,117 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 18:42:14,119 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 18:42:14,119 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 18:42:14,123 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 18:42:14,124 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 06:42:12" (1/3) ... [2021-11-25 18:42:14,124 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7bcf21a9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 06:42:14, skipping insertion in model container [2021-11-25 18:42:14,125 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:42:12" (2/3) ... [2021-11-25 18:42:14,125 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7bcf21a9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 06:42:14, skipping insertion in model container [2021-11-25 18:42:14,125 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 06:42:14" (3/3) ... [2021-11-25 18:42:14,127 INFO L111 eAbstractionObserver]: Analyzing ICFG toy2.cil.c [2021-11-25 18:42:14,133 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 18:42:14,134 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-25 18:42:14,188 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 18:42:14,195 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 [2021-11-25 18:42:14,196 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-25 18:42:14,212 INFO L276 IsEmpty]: Start isEmpty. Operand has 42 states, 40 states have (on average 1.675) internal successors, (67), 41 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:42:14,219 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-25 18:42:14,219 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:42:14,220 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:42:14,220 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:42:14,226 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:42:14,227 INFO L85 PathProgramCache]: Analyzing trace with hash -562866106, now seen corresponding path program 1 times [2021-11-25 18:42:14,237 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:42:14,238 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [931588930] [2021-11-25 18:42:14,238 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:42:14,239 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:42:14,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:42:14,455 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:42:14,456 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:42:14,457 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [931588930] [2021-11-25 18:42:14,458 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [931588930] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:42:14,458 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:42:14,458 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 18:42:14,460 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [91801953] [2021-11-25 18:42:14,461 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:42:14,466 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:42:14,466 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:42:14,497 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:42:14,498 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 18:42:14,500 INFO L87 Difference]: Start difference. First operand has 42 states, 40 states have (on average 1.675) internal successors, (67), 41 states have internal predecessors, (67), 0 states have call successors, (0), 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 4.333333333333333) internal successors, (13), 2 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:42:14,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:42:14,617 INFO L93 Difference]: Finished difference Result 109 states and 175 transitions. [2021-11-25 18:42:14,619 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:42:14,621 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 2 states have internal predecessors, (13), 0 states have call successors, (0), 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 13 [2021-11-25 18:42:14,621 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:42:14,633 INFO L225 Difference]: With dead ends: 109 [2021-11-25 18:42:14,634 INFO L226 Difference]: Without dead ends: 65 [2021-11-25 18:42:14,637 INFO L932 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 [2021-11-25 18:42:14,642 INFO L933 BasicCegarLoop]: 44 mSDtfsCounter, 35 mSDsluCounter, 43 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 81 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:42:14,643 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [35 Valid, 81 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:42:14,665 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-11-25 18:42:14,687 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 64. [2021-11-25 18:42:14,689 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 63 states have (on average 1.5396825396825398) internal successors, (97), 63 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:42:14,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 97 transitions. [2021-11-25 18:42:14,693 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 97 transitions. Word has length 13 [2021-11-25 18:42:14,694 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:42:14,694 INFO L470 AbstractCegarLoop]: Abstraction has 64 states and 97 transitions. [2021-11-25 18:42:14,695 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 2 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:42:14,695 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 97 transitions. [2021-11-25 18:42:14,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-25 18:42:14,697 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:42:14,697 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:42:14,698 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-25 18:42:14,698 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:42:14,699 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:42:14,700 INFO L85 PathProgramCache]: Analyzing trace with hash -1416206406, now seen corresponding path program 1 times [2021-11-25 18:42:14,700 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:42:14,700 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1849368997] [2021-11-25 18:42:14,701 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:42:14,701 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:42:14,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:42:14,851 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:42:14,852 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:42:14,852 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1849368997] [2021-11-25 18:42:14,853 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1849368997] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:42:14,853 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:42:14,853 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 18:42:14,853 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1055511172] [2021-11-25 18:42:14,854 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:42:14,855 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:42:14,856 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:42:14,856 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:42:14,857 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 18:42:14,857 INFO L87 Difference]: Start difference. First operand 64 states and 97 transitions. Second operand has 3 states, 3 states have (on average 7.333333333333333) internal successors, (22), 3 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:42:14,987 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:42:14,988 INFO L93 Difference]: Finished difference Result 116 states and 181 transitions. [2021-11-25 18:42:14,989 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:42:14,989 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 7.333333333333333) internal successors, (22), 3 states have internal predecessors, (22), 0 states have call successors, (0), 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 22 [2021-11-25 18:42:14,990 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:42:14,991 INFO L225 Difference]: With dead ends: 116 [2021-11-25 18:42:14,992 INFO L226 Difference]: Without dead ends: 81 [2021-11-25 18:42:14,993 INFO L932 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 [2021-11-25 18:42:14,995 INFO L933 BasicCegarLoop]: 62 mSDtfsCounter, 20 mSDsluCounter, 43 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:42:14,996 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 98 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:42:14,998 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2021-11-25 18:42:15,008 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 74. [2021-11-25 18:42:15,009 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 73 states have (on average 1.547945205479452) internal successors, (113), 73 states have internal predecessors, (113), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:42:15,011 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 113 transitions. [2021-11-25 18:42:15,012 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 113 transitions. Word has length 22 [2021-11-25 18:42:15,012 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:42:15,013 INFO L470 AbstractCegarLoop]: Abstraction has 74 states and 113 transitions. [2021-11-25 18:42:15,013 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 7.333333333333333) internal successors, (22), 3 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:42:15,013 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 113 transitions. [2021-11-25 18:42:15,015 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-25 18:42:15,016 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:42:15,016 INFO L514 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] [2021-11-25 18:42:15,016 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-25 18:42:15,017 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:42:15,018 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:42:15,018 INFO L85 PathProgramCache]: Analyzing trace with hash 1395012587, now seen corresponding path program 1 times [2021-11-25 18:42:15,018 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:42:15,019 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1630885980] [2021-11-25 18:42:15,019 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:42:15,019 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:42:15,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:42:15,210 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:42:15,210 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:42:15,211 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1630885980] [2021-11-25 18:42:15,212 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1630885980] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:42:15,214 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:42:15,214 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 18:42:15,214 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [889123136] [2021-11-25 18:42:15,215 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:42:15,216 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 18:42:15,217 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:42:15,218 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 18:42:15,219 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 18:42:15,219 INFO L87 Difference]: Start difference. First operand 74 states and 113 transitions. Second operand has 4 states, 4 states have (on average 6.5) internal successors, (26), 3 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:42:15,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:42:15,366 INFO L93 Difference]: Finished difference Result 217 states and 334 transitions. [2021-11-25 18:42:15,367 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 18:42:15,367 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 6.5) internal successors, (26), 3 states have internal predecessors, (26), 0 states have call successors, (0), 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 26 [2021-11-25 18:42:15,368 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:42:15,376 INFO L225 Difference]: With dead ends: 217 [2021-11-25 18:42:15,376 INFO L226 Difference]: Without dead ends: 147 [2021-11-25 18:42:15,378 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 18:42:15,384 INFO L933 BasicCegarLoop]: 52 mSDtfsCounter, 59 mSDsluCounter, 78 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 119 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:42:15,385 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [59 Valid, 119 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:42:15,386 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2021-11-25 18:42:15,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 111. [2021-11-25 18:42:15,419 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 110 states have (on average 1.5363636363636364) internal successors, (169), 110 states have internal predecessors, (169), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:42:15,421 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 169 transitions. [2021-11-25 18:42:15,422 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 169 transitions. Word has length 26 [2021-11-25 18:42:15,422 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:42:15,422 INFO L470 AbstractCegarLoop]: Abstraction has 111 states and 169 transitions. [2021-11-25 18:42:15,423 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 6.5) internal successors, (26), 3 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:42:15,423 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 169 transitions. [2021-11-25 18:42:15,425 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-25 18:42:15,425 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:42:15,425 INFO L514 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] [2021-11-25 18:42:15,428 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-25 18:42:15,428 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:42:15,430 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:42:15,430 INFO L85 PathProgramCache]: Analyzing trace with hash 838089681, now seen corresponding path program 1 times [2021-11-25 18:42:15,430 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:42:15,431 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [854798987] [2021-11-25 18:42:15,432 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:42:15,432 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:42:15,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:42:15,604 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 18:42:15,604 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:42:15,605 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [854798987] [2021-11-25 18:42:15,605 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [854798987] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:42:15,605 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:42:15,606 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-25 18:42:15,606 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [797652756] [2021-11-25 18:42:15,606 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:42:15,607 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 18:42:15,607 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:42:15,608 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 18:42:15,609 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-25 18:42:15,609 INFO L87 Difference]: Start difference. First operand 111 states and 169 transitions. Second operand has 5 states, 5 states have (on average 6.6) internal successors, (33), 5 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:42:15,820 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:42:15,821 INFO L93 Difference]: Finished difference Result 291 states and 446 transitions. [2021-11-25 18:42:15,821 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 18:42:15,822 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 6.6) internal successors, (33), 5 states have internal predecessors, (33), 0 states have call successors, (0), 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 34 [2021-11-25 18:42:15,823 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:42:15,826 INFO L225 Difference]: With dead ends: 291 [2021-11-25 18:42:15,826 INFO L226 Difference]: Without dead ends: 221 [2021-11-25 18:42:15,827 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-25 18:42:15,839 INFO L933 BasicCegarLoop]: 40 mSDtfsCounter, 111 mSDsluCounter, 128 mSDsCounter, 0 mSdLazyCounter, 75 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 111 SdHoareTripleChecker+Valid, 153 SdHoareTripleChecker+Invalid, 89 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 75 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:42:15,840 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [111 Valid, 153 Invalid, 89 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 75 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 18:42:15,842 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 221 states. [2021-11-25 18:42:15,880 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 221 to 189. [2021-11-25 18:42:15,881 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 189 states, 188 states have (on average 1.553191489361702) internal successors, (292), 188 states have internal predecessors, (292), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:42:15,883 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 189 states to 189 states and 292 transitions. [2021-11-25 18:42:15,883 INFO L78 Accepts]: Start accepts. Automaton has 189 states and 292 transitions. Word has length 34 [2021-11-25 18:42:15,884 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:42:15,884 INFO L470 AbstractCegarLoop]: Abstraction has 189 states and 292 transitions. [2021-11-25 18:42:15,884 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 6.6) internal successors, (33), 5 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:42:15,885 INFO L276 IsEmpty]: Start isEmpty. Operand 189 states and 292 transitions. [2021-11-25 18:42:15,887 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-25 18:42:15,888 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:42:15,888 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 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] [2021-11-25 18:42:15,888 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-25 18:42:15,889 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:42:15,889 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:42:15,895 INFO L85 PathProgramCache]: Analyzing trace with hash -1181137552, now seen corresponding path program 1 times [2021-11-25 18:42:15,895 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:42:15,896 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1809186872] [2021-11-25 18:42:15,896 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:42:15,897 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:42:16,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:42:16,380 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 13 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:42:16,381 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:42:16,382 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1809186872] [2021-11-25 18:42:16,383 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1809186872] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:42:16,383 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1839454420] [2021-11-25 18:42:16,384 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:42:16,386 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:42:16,387 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6218d98e-706e-434d-a3c4-2feaa79f0b28/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:42:16,389 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6218d98e-706e-434d-a3c4-2feaa79f0b28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:42:16,409 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6218d98e-706e-434d-a3c4-2feaa79f0b28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 18:42:16,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:42:16,544 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 42 conjunts are in the unsatisfiable core [2021-11-25 18:42:16,567 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:42:19,159 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 13 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:42:19,159 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:42:23,780 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 1 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:42:23,781 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1839454420] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:42:23,781 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1236415428] [2021-11-25 18:42:23,810 INFO L159 IcfgInterpreter]: Started Sifa with 33 locations of interest [2021-11-25 18:42:23,810 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:42:23,815 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:42:23,822 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:42:23,823 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:44:17,545 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:44:23,084 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [1236415428] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:44:23,084 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:44:23,084 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [9, 9, 13] total 47 [2021-11-25 18:44:23,085 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [926034860] [2021-11-25 18:44:23,085 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:44:23,086 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-25 18:44:23,086 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:44:23,087 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-25 18:44:23,088 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=479, Invalid=1777, Unknown=0, NotChecked=0, Total=2256 [2021-11-25 18:44:23,088 INFO L87 Difference]: Start difference. First operand 189 states and 292 transitions. Second operand has 20 states, 20 states have (on average 1.8) internal successors, (36), 19 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:44:25,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:44:25,617 INFO L93 Difference]: Finished difference Result 448 states and 678 transitions. [2021-11-25 18:44:25,618 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-25 18:44:25,619 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.8) internal successors, (36), 19 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 49 [2021-11-25 18:44:25,619 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:44:25,621 INFO L225 Difference]: With dead ends: 448 [2021-11-25 18:44:25,621 INFO L226 Difference]: Without dead ends: 264 [2021-11-25 18:44:25,624 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 106 SyntacticMatches, 2 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1387 ImplicationChecksByTransitivity, 7.9s TimeCoverageRelationStatistics Valid=576, Invalid=2286, Unknown=0, NotChecked=0, Total=2862 [2021-11-25 18:44:25,625 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 69 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 611 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 91 SdHoareTripleChecker+Invalid, 647 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 611 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-25 18:44:25,625 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [69 Valid, 91 Invalid, 647 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 611 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-25 18:44:25,626 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 264 states. [2021-11-25 18:44:25,646 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 264 to 225. [2021-11-25 18:44:25,647 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 225 states, 224 states have (on average 1.4330357142857142) internal successors, (321), 224 states have internal predecessors, (321), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:44:25,649 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 225 states to 225 states and 321 transitions. [2021-11-25 18:44:25,649 INFO L78 Accepts]: Start accepts. Automaton has 225 states and 321 transitions. Word has length 49 [2021-11-25 18:44:25,649 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:44:25,649 INFO L470 AbstractCegarLoop]: Abstraction has 225 states and 321 transitions. [2021-11-25 18:44:25,650 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.8) internal successors, (36), 19 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:44:25,650 INFO L276 IsEmpty]: Start isEmpty. Operand 225 states and 321 transitions. [2021-11-25 18:44:25,653 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-25 18:44:25,653 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:44:25,653 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 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] [2021-11-25 18:44:25,688 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6218d98e-706e-434d-a3c4-2feaa79f0b28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-25 18:44:25,870 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6218d98e-706e-434d-a3c4-2feaa79f0b28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:44:25,870 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:44:25,870 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:44:25,871 INFO L85 PathProgramCache]: Analyzing trace with hash -965584675, now seen corresponding path program 1 times [2021-11-25 18:44:25,871 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:44:25,871 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [523484195] [2021-11-25 18:44:25,871 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:44:25,871 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:44:25,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:44:25,938 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 20 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 18:44:25,938 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:44:25,939 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [523484195] [2021-11-25 18:44:25,939 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [523484195] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:44:25,939 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:44:25,939 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 18:44:25,939 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [882764053] [2021-11-25 18:44:25,939 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:44:25,940 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:44:25,940 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:44:25,940 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:44:25,941 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 18:44:25,941 INFO L87 Difference]: Start difference. First operand 225 states and 321 transitions. Second operand has 3 states, 3 states have (on average 14.666666666666666) internal successors, (44), 3 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:44:26,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:44:26,009 INFO L93 Difference]: Finished difference Result 490 states and 712 transitions. [2021-11-25 18:44:26,010 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:44:26,010 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 14.666666666666666) internal successors, (44), 3 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 49 [2021-11-25 18:44:26,012 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:44:26,014 INFO L225 Difference]: With dead ends: 490 [2021-11-25 18:44:26,014 INFO L226 Difference]: Without dead ends: 277 [2021-11-25 18:44:26,016 INFO L932 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 [2021-11-25 18:44:26,018 INFO L933 BasicCegarLoop]: 48 mSDtfsCounter, 35 mSDsluCounter, 38 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 80 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 18:44:26,019 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [35 Valid, 80 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 18:44:26,020 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 277 states. [2021-11-25 18:44:26,041 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 277 to 275. [2021-11-25 18:44:26,043 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 275 states, 274 states have (on average 1.437956204379562) internal successors, (394), 274 states have internal predecessors, (394), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:44:26,047 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 275 states to 275 states and 394 transitions. [2021-11-25 18:44:26,048 INFO L78 Accepts]: Start accepts. Automaton has 275 states and 394 transitions. Word has length 49 [2021-11-25 18:44:26,048 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:44:26,048 INFO L470 AbstractCegarLoop]: Abstraction has 275 states and 394 transitions. [2021-11-25 18:44:26,049 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 14.666666666666666) internal successors, (44), 3 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:44:26,051 INFO L276 IsEmpty]: Start isEmpty. Operand 275 states and 394 transitions. [2021-11-25 18:44:26,064 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-25 18:44:26,064 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:44:26,064 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 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] [2021-11-25 18:44:26,065 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-25 18:44:26,065 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:44:26,065 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:44:26,065 INFO L85 PathProgramCache]: Analyzing trace with hash 373989677, now seen corresponding path program 1 times [2021-11-25 18:44:26,065 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:44:26,066 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2062178784] [2021-11-25 18:44:26,066 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:44:26,066 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:44:26,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:44:26,145 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 20 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 18:44:26,145 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:44:26,145 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2062178784] [2021-11-25 18:44:26,145 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2062178784] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:44:26,145 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:44:26,146 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 18:44:26,146 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1158145481] [2021-11-25 18:44:26,146 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:44:26,146 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 18:44:26,146 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:44:26,147 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 18:44:26,147 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 18:44:26,147 INFO L87 Difference]: Start difference. First operand 275 states and 394 transitions. Second operand has 4 states, 4 states have (on average 11.25) internal successors, (45), 4 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:44:26,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:44:26,228 INFO L93 Difference]: Finished difference Result 537 states and 787 transitions. [2021-11-25 18:44:26,228 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 18:44:26,229 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 11.25) internal successors, (45), 4 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 50 [2021-11-25 18:44:26,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:44:26,232 INFO L225 Difference]: With dead ends: 537 [2021-11-25 18:44:26,232 INFO L226 Difference]: Without dead ends: 339 [2021-11-25 18:44:26,233 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 18:44:26,234 INFO L933 BasicCegarLoop]: 80 mSDtfsCounter, 45 mSDsluCounter, 141 mSDsCounter, 0 mSdLazyCounter, 62 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 198 SdHoareTripleChecker+Invalid, 66 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 62 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:44:26,235 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [45 Valid, 198 Invalid, 66 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 62 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:44:26,236 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 339 states. [2021-11-25 18:44:26,256 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 339 to 309. [2021-11-25 18:44:26,257 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 309 states, 308 states have (on average 1.422077922077922) internal successors, (438), 308 states have internal predecessors, (438), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:44:26,258 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 309 states to 309 states and 438 transitions. [2021-11-25 18:44:26,258 INFO L78 Accepts]: Start accepts. Automaton has 309 states and 438 transitions. Word has length 50 [2021-11-25 18:44:26,258 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:44:26,259 INFO L470 AbstractCegarLoop]: Abstraction has 309 states and 438 transitions. [2021-11-25 18:44:26,259 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 11.25) internal successors, (45), 4 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:44:26,259 INFO L276 IsEmpty]: Start isEmpty. Operand 309 states and 438 transitions. [2021-11-25 18:44:26,260 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-11-25 18:44:26,260 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:44:26,260 INFO L514 BasicCegarLoop]: trace histogram [5, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:44:26,260 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-25 18:44:26,260 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:44:26,261 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:44:26,261 INFO L85 PathProgramCache]: Analyzing trace with hash 308280441, now seen corresponding path program 1 times [2021-11-25 18:44:26,261 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:44:26,261 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [795219536] [2021-11-25 18:44:26,261 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:44:26,262 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:44:26,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:44:26,447 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 26 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:44:26,447 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:44:26,448 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [795219536] [2021-11-25 18:44:26,449 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [795219536] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:44:26,449 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [855605037] [2021-11-25 18:44:26,449 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:44:26,449 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:44:26,456 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6218d98e-706e-434d-a3c4-2feaa79f0b28/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:44:26,457 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6218d98e-706e-434d-a3c4-2feaa79f0b28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:44:26,481 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6218d98e-706e-434d-a3c4-2feaa79f0b28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-25 18:44:26,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:44:26,553 INFO L263 TraceCheckSpWp]: Trace formula consists of 236 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-25 18:44:26,555 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:44:26,747 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 32 proven. 2 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 18:44:26,748 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:44:27,208 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 31 proven. 11 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 18:44:27,209 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [855605037] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:44:27,209 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [368708584] [2021-11-25 18:44:27,215 INFO L159 IcfgInterpreter]: Started Sifa with 30 locations of interest [2021-11-25 18:44:27,215 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:44:27,216 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:44:27,216 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:44:27,216 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:46:42,960 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:46:48,882 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [368708584] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:46:48,882 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:46:48,882 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [9, 4, 9] total 38 [2021-11-25 18:46:48,883 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [636379746] [2021-11-25 18:46:48,883 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:46:48,883 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-11-25 18:46:48,883 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:46:48,884 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-11-25 18:46:48,886 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=321, Invalid=1085, Unknown=0, NotChecked=0, Total=1406 [2021-11-25 18:46:48,886 INFO L87 Difference]: Start difference. First operand 309 states and 438 transitions. Second operand has 21 states, 21 states have (on average 1.5714285714285714) internal successors, (33), 20 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:46:52,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:46:52,176 INFO L93 Difference]: Finished difference Result 637 states and 927 transitions. [2021-11-25 18:46:52,176 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-25 18:46:52,176 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.5714285714285714) internal successors, (33), 20 states have internal predecessors, (33), 0 states have call successors, (0), 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 [2021-11-25 18:46:52,177 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:46:52,179 INFO L225 Difference]: With dead ends: 637 [2021-11-25 18:46:52,179 INFO L226 Difference]: Without dead ends: 406 [2021-11-25 18:46:52,181 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 187 GetRequests, 142 SyntacticMatches, 3 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 834 ImplicationChecksByTransitivity, 8.5s TimeCoverageRelationStatistics Valid=417, Invalid=1475, Unknown=0, NotChecked=0, Total=1892 [2021-11-25 18:46:52,181 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 83 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 694 mSolverCounterSat, 40 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 83 SdHoareTripleChecker+Valid, 86 SdHoareTripleChecker+Invalid, 734 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 694 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-25 18:46:52,182 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [83 Valid, 86 Invalid, 734 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 694 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-25 18:46:52,182 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 406 states. [2021-11-25 18:46:52,205 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 406 to 323. [2021-11-25 18:46:52,206 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 323 states, 322 states have (on average 1.4161490683229814) internal successors, (456), 322 states have internal predecessors, (456), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:46:52,207 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 323 states to 323 states and 456 transitions. [2021-11-25 18:46:52,207 INFO L78 Accepts]: Start accepts. Automaton has 323 states and 456 transitions. Word has length 57 [2021-11-25 18:46:52,208 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:46:52,208 INFO L470 AbstractCegarLoop]: Abstraction has 323 states and 456 transitions. [2021-11-25 18:46:52,208 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 1.5714285714285714) internal successors, (33), 20 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:46:52,208 INFO L276 IsEmpty]: Start isEmpty. Operand 323 states and 456 transitions. [2021-11-25 18:46:52,209 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-11-25 18:46:52,209 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:46:52,209 INFO L514 BasicCegarLoop]: trace histogram [5, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:46:52,241 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6218d98e-706e-434d-a3c4-2feaa79f0b28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-25 18:46:52,434 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6218d98e-706e-434d-a3c4-2feaa79f0b28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:46:52,434 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:46:52,434 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:46:52,434 INFO L85 PathProgramCache]: Analyzing trace with hash -1608372813, now seen corresponding path program 1 times [2021-11-25 18:46:52,435 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:46:52,435 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [820558242] [2021-11-25 18:46:52,435 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:46:52,435 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:46:52,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:46:52,485 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-11-25 18:46:52,485 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:46:52,485 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [820558242] [2021-11-25 18:46:52,485 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [820558242] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:46:52,485 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:46:52,485 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 18:46:52,486 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1452436767] [2021-11-25 18:46:52,486 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:46:52,486 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:46:52,486 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:46:52,487 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:46:52,487 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 18:46:52,487 INFO L87 Difference]: Start difference. First operand 323 states and 456 transitions. Second operand has 3 states, 3 states have (on average 13.666666666666666) internal successors, (41), 3 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:46:52,550 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:46:52,550 INFO L93 Difference]: Finished difference Result 607 states and 885 transitions. [2021-11-25 18:46:52,550 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:46:52,551 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 13.666666666666666) internal successors, (41), 3 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 58 [2021-11-25 18:46:52,551 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:46:52,553 INFO L225 Difference]: With dead ends: 607 [2021-11-25 18:46:52,553 INFO L226 Difference]: Without dead ends: 376 [2021-11-25 18:46:52,554 INFO L932 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 [2021-11-25 18:46:52,554 INFO L933 BasicCegarLoop]: 47 mSDtfsCounter, 38 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 18:46:52,555 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 57 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 18:46:52,555 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 376 states. [2021-11-25 18:46:52,577 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 376 to 324. [2021-11-25 18:46:52,578 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 324 states, 323 states have (on average 1.3653250773993808) internal successors, (441), 323 states have internal predecessors, (441), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:46:52,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 324 states to 324 states and 441 transitions. [2021-11-25 18:46:52,580 INFO L78 Accepts]: Start accepts. Automaton has 324 states and 441 transitions. Word has length 58 [2021-11-25 18:46:52,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:46:52,580 INFO L470 AbstractCegarLoop]: Abstraction has 324 states and 441 transitions. [2021-11-25 18:46:52,580 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 13.666666666666666) internal successors, (41), 3 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:46:52,580 INFO L276 IsEmpty]: Start isEmpty. Operand 324 states and 441 transitions. [2021-11-25 18:46:52,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-25 18:46:52,582 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:46:52,582 INFO L514 BasicCegarLoop]: trace histogram [6, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:46:52,582 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-25 18:46:52,582 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:46:52,583 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:46:52,583 INFO L85 PathProgramCache]: Analyzing trace with hash 1706705227, now seen corresponding path program 1 times [2021-11-25 18:46:52,583 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:46:52,583 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [123177202] [2021-11-25 18:46:52,583 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:46:52,583 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:46:52,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:46:52,730 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 47 proven. 7 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-25 18:46:52,730 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:46:52,730 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [123177202] [2021-11-25 18:46:52,730 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [123177202] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:46:52,730 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1791915775] [2021-11-25 18:46:52,730 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:46:52,731 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:46:52,731 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6218d98e-706e-434d-a3c4-2feaa79f0b28/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:46:52,732 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6218d98e-706e-434d-a3c4-2feaa79f0b28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:46:52,750 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6218d98e-706e-434d-a3c4-2feaa79f0b28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-25 18:46:52,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:46:52,827 INFO L263 TraceCheckSpWp]: Trace formula consists of 264 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-25 18:46:52,830 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:46:52,977 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 50 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-25 18:46:52,977 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:46:52,977 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1791915775] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:46:52,977 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:46:52,977 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [8] total 11 [2021-11-25 18:46:52,977 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1140844629] [2021-11-25 18:46:52,977 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:46:52,978 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 18:46:52,978 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:46:52,978 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 18:46:52,978 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2021-11-25 18:46:52,979 INFO L87 Difference]: Start difference. First operand 324 states and 441 transitions. Second operand has 6 states, 6 states have (on average 10.166666666666666) internal successors, (61), 6 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:46:53,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:46:53,106 INFO L93 Difference]: Finished difference Result 583 states and 794 transitions. [2021-11-25 18:46:53,106 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 18:46:53,106 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 10.166666666666666) internal successors, (61), 6 states have internal predecessors, (61), 0 states have call successors, (0), 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 68 [2021-11-25 18:46:53,106 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:46:53,108 INFO L225 Difference]: With dead ends: 583 [2021-11-25 18:46:53,108 INFO L226 Difference]: Without dead ends: 188 [2021-11-25 18:46:53,109 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 68 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2021-11-25 18:46:53,109 INFO L933 BasicCegarLoop]: 63 mSDtfsCounter, 129 mSDsluCounter, 103 mSDsCounter, 0 mSdLazyCounter, 77 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 129 SdHoareTripleChecker+Valid, 158 SdHoareTripleChecker+Invalid, 95 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 77 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:46:53,111 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [129 Valid, 158 Invalid, 95 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 77 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:46:53,112 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 188 states. [2021-11-25 18:46:53,129 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 188 to 182. [2021-11-25 18:46:53,129 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 182 states, 181 states have (on average 1.2265193370165746) internal successors, (222), 181 states have internal predecessors, (222), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:46:53,130 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 182 states to 182 states and 222 transitions. [2021-11-25 18:46:53,130 INFO L78 Accepts]: Start accepts. Automaton has 182 states and 222 transitions. Word has length 68 [2021-11-25 18:46:53,131 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:46:53,131 INFO L470 AbstractCegarLoop]: Abstraction has 182 states and 222 transitions. [2021-11-25 18:46:53,131 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 10.166666666666666) internal successors, (61), 6 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:46:53,131 INFO L276 IsEmpty]: Start isEmpty. Operand 182 states and 222 transitions. [2021-11-25 18:46:53,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-25 18:46:53,132 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:46:53,132 INFO L514 BasicCegarLoop]: trace histogram [6, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:46:53,168 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6218d98e-706e-434d-a3c4-2feaa79f0b28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-25 18:46:53,345 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6218d98e-706e-434d-a3c4-2feaa79f0b28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-25 18:46:53,345 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:46:53,346 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:46:53,346 INFO L85 PathProgramCache]: Analyzing trace with hash -355755234, now seen corresponding path program 1 times [2021-11-25 18:46:53,346 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:46:53,346 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1173419970] [2021-11-25 18:46:53,346 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:46:53,346 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:46:53,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:46:53,441 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 49 proven. 7 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-25 18:46:53,441 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:46:53,441 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1173419970] [2021-11-25 18:46:53,441 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1173419970] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:46:53,441 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1555069260] [2021-11-25 18:46:53,442 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:46:53,442 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:46:53,442 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6218d98e-706e-434d-a3c4-2feaa79f0b28/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:46:53,446 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6218d98e-706e-434d-a3c4-2feaa79f0b28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:46:53,465 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6218d98e-706e-434d-a3c4-2feaa79f0b28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-25 18:46:53,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:46:53,540 INFO L263 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-25 18:46:53,542 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:46:53,698 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 52 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-25 18:46:53,698 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:46:53,699 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1555069260] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:46:53,699 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:46:53,699 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [8] total 11 [2021-11-25 18:46:53,699 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [254218027] [2021-11-25 18:46:53,699 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:46:53,700 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 18:46:53,700 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:46:53,701 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 18:46:53,701 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2021-11-25 18:46:53,701 INFO L87 Difference]: Start difference. First operand 182 states and 222 transitions. Second operand has 6 states, 6 states have (on average 10.5) internal successors, (63), 6 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:46:53,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:46:53,789 INFO L93 Difference]: Finished difference Result 321 states and 401 transitions. [2021-11-25 18:46:53,789 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 18:46:53,790 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 10.5) internal successors, (63), 6 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 70 [2021-11-25 18:46:53,790 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:46:53,791 INFO L225 Difference]: With dead ends: 321 [2021-11-25 18:46:53,792 INFO L226 Difference]: Without dead ends: 219 [2021-11-25 18:46:53,792 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 70 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2021-11-25 18:46:53,793 INFO L933 BasicCegarLoop]: 64 mSDtfsCounter, 96 mSDsluCounter, 111 mSDsCounter, 0 mSdLazyCounter, 77 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 96 SdHoareTripleChecker+Valid, 167 SdHoareTripleChecker+Invalid, 87 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 77 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:46:53,793 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [96 Valid, 167 Invalid, 87 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 77 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:46:53,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 219 states. [2021-11-25 18:46:53,817 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 219 to 213. [2021-11-25 18:46:53,818 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 213 states, 212 states have (on average 1.2122641509433962) internal successors, (257), 212 states have internal predecessors, (257), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:46:53,819 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 213 states to 213 states and 257 transitions. [2021-11-25 18:46:53,819 INFO L78 Accepts]: Start accepts. Automaton has 213 states and 257 transitions. Word has length 70 [2021-11-25 18:46:53,819 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:46:53,820 INFO L470 AbstractCegarLoop]: Abstraction has 213 states and 257 transitions. [2021-11-25 18:46:53,820 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 10.5) internal successors, (63), 6 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:46:53,820 INFO L276 IsEmpty]: Start isEmpty. Operand 213 states and 257 transitions. [2021-11-25 18:46:53,821 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-11-25 18:46:53,821 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:46:53,821 INFO L514 BasicCegarLoop]: trace histogram [6, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:46:53,846 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6218d98e-706e-434d-a3c4-2feaa79f0b28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-25 18:46:54,034 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6218d98e-706e-434d-a3c4-2feaa79f0b28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:46:54,034 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:46:54,034 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:46:54,034 INFO L85 PathProgramCache]: Analyzing trace with hash -655031711, now seen corresponding path program 1 times [2021-11-25 18:46:54,035 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:46:54,035 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1902577315] [2021-11-25 18:46:54,035 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:46:54,035 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:46:54,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:46:54,284 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 37 proven. 27 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 18:46:54,284 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:46:54,285 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1902577315] [2021-11-25 18:46:54,285 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1902577315] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:46:54,285 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1458663163] [2021-11-25 18:46:54,285 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:46:54,285 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:46:54,285 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6218d98e-706e-434d-a3c4-2feaa79f0b28/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:46:54,286 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6218d98e-706e-434d-a3c4-2feaa79f0b28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:46:54,286 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6218d98e-706e-434d-a3c4-2feaa79f0b28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-25 18:46:54,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:46:54,384 INFO L263 TraceCheckSpWp]: Trace formula consists of 268 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-25 18:46:54,397 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:46:54,851 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 37 proven. 27 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 18:46:54,851 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:46:55,579 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 18 proven. 44 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-25 18:46:55,579 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1458663163] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:46:55,579 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [563079945] [2021-11-25 18:46:55,584 INFO L159 IcfgInterpreter]: Started Sifa with 37 locations of interest [2021-11-25 18:46:55,584 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:46:55,584 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:46:55,585 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:46:55,585 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:54:17,056 WARN L137 XnfTransformerHelper]: expecting exponential blowup for input size 6 [2021-11-25 18:54:17,063 WARN L137 XnfTransformerHelper]: expecting exponential blowup for input size 6