./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/Problem05_label42+token_ring.13.cil-2.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_fa6a7100-47d2-48d9-b60b-5cdd109346cb/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa6a7100-47d2-48d9-b60b-5cdd109346cb/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_fa6a7100-47d2-48d9-b60b-5cdd109346cb/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa6a7100-47d2-48d9-b60b-5cdd109346cb/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/Problem05_label42+token_ring.13.cil-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa6a7100-47d2-48d9-b60b-5cdd109346cb/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_fa6a7100-47d2-48d9-b60b-5cdd109346cb/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 216404335c43b82447a03ad9d88ac8bc18e7528b04f40169d87fb26955d8753c --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 19:04:44,846 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 19:04:44,848 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 19:04:44,887 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 19:04:44,887 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 19:04:44,889 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 19:04:44,891 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 19:04:44,894 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 19:04:44,896 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 19:04:44,898 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 19:04:44,899 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 19:04:44,901 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 19:04:44,902 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 19:04:44,903 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 19:04:44,905 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 19:04:44,907 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 19:04:44,908 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 19:04:44,910 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 19:04:44,917 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 19:04:44,920 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 19:04:44,922 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 19:04:44,932 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 19:04:44,933 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 19:04:44,935 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 19:04:44,939 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 19:04:44,939 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 19:04:44,940 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 19:04:44,941 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 19:04:44,950 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 19:04:44,952 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 19:04:44,953 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 19:04:44,954 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 19:04:44,956 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 19:04:44,957 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 19:04:44,959 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 19:04:44,959 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 19:04:44,960 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 19:04:44,961 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 19:04:44,961 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 19:04:44,962 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 19:04:44,963 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 19:04:44,964 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa6a7100-47d2-48d9-b60b-5cdd109346cb/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-25 19:04:45,030 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 19:04:45,030 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 19:04:45,031 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 19:04:45,031 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 19:04:45,039 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 19:04:45,039 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 19:04:45,039 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 19:04:45,040 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 19:04:45,040 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 19:04:45,040 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 19:04:45,040 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 19:04:45,041 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 19:04:45,041 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 19:04:45,041 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 19:04:45,041 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 19:04:45,042 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 19:04:45,042 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 19:04:45,042 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 19:04:45,043 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 19:04:45,043 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 19:04:45,044 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 19:04:45,044 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 19:04:45,044 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 19:04:45,044 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 19:04:45,045 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 19:04:45,045 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 19:04:45,045 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 19:04:45,045 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 19:04:45,045 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 19:04:45,046 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 19:04:45,046 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 19:04:45,046 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 19:04:45,046 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 19:04:45,047 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 19:04:45,047 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 19:04:45,047 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 19:04:45,048 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 19:04:45,048 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 19:04:45,048 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 19:04:45,048 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 19:04:45,055 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 19:04:45,056 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_fa6a7100-47d2-48d9-b60b-5cdd109346cb/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa6a7100-47d2-48d9-b60b-5cdd109346cb/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 216404335c43b82447a03ad9d88ac8bc18e7528b04f40169d87fb26955d8753c [2021-11-25 19:04:45,397 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 19:04:45,426 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 19:04:45,429 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 19:04:45,431 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 19:04:45,431 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 19:04:45,433 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa6a7100-47d2-48d9-b60b-5cdd109346cb/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/combinations/Problem05_label42+token_ring.13.cil-2.c [2021-11-25 19:04:45,499 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa6a7100-47d2-48d9-b60b-5cdd109346cb/bin/utaipan-eEHZpOm5b7/data/8da92c286/436927435e4743548deeff7831a00fb7/FLAG056d5ffc2 [2021-11-25 19:04:46,713 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 19:04:46,715 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa6a7100-47d2-48d9-b60b-5cdd109346cb/sv-benchmarks/c/combinations/Problem05_label42+token_ring.13.cil-2.c [2021-11-25 19:04:46,786 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa6a7100-47d2-48d9-b60b-5cdd109346cb/bin/utaipan-eEHZpOm5b7/data/8da92c286/436927435e4743548deeff7831a00fb7/FLAG056d5ffc2 [2021-11-25 19:04:46,925 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa6a7100-47d2-48d9-b60b-5cdd109346cb/bin/utaipan-eEHZpOm5b7/data/8da92c286/436927435e4743548deeff7831a00fb7 [2021-11-25 19:04:46,930 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 19:04:46,933 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 19:04:46,935 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 19:04:46,935 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 19:04:46,939 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 19:04:46,940 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 07:04:46" (1/1) ... [2021-11-25 19:04:46,942 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@66dbb610 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:04:46, skipping insertion in model container [2021-11-25 19:04:46,943 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 07:04:46" (1/1) ... [2021-11-25 19:04:46,952 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 19:04:47,292 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 19:04:49,979 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_fa6a7100-47d2-48d9-b60b-5cdd109346cb/sv-benchmarks/c/combinations/Problem05_label42+token_ring.13.cil-2.c[378560,378573] [2021-11-25 19:04:50,013 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_fa6a7100-47d2-48d9-b60b-5cdd109346cb/sv-benchmarks/c/combinations/Problem05_label42+token_ring.13.cil-2.c[383339,383352] [2021-11-25 19:04:50,457 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 19:04:50,468 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 19:04:51,857 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_fa6a7100-47d2-48d9-b60b-5cdd109346cb/sv-benchmarks/c/combinations/Problem05_label42+token_ring.13.cil-2.c[378560,378573] [2021-11-25 19:04:51,865 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_fa6a7100-47d2-48d9-b60b-5cdd109346cb/sv-benchmarks/c/combinations/Problem05_label42+token_ring.13.cil-2.c[383339,383352] [2021-11-25 19:04:51,916 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 19:04:51,996 INFO L208 MainTranslator]: Completed translation [2021-11-25 19:04:51,997 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:04:51 WrapperNode [2021-11-25 19:04:51,997 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 19:04:51,998 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 19:04:51,998 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 19:04:51,998 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 19:04:52,004 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:04:51" (1/1) ... [2021-11-25 19:04:52,106 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:04:51" (1/1) ... [2021-11-25 19:04:52,695 INFO L137 Inliner]: procedures = 70, calls = 80, calls flagged for inlining = 48, calls inlined = 48, statements flattened = 13257 [2021-11-25 19:04:52,696 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 19:04:52,697 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 19:04:52,698 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 19:04:52,698 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 19:04:52,708 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:04:51" (1/1) ... [2021-11-25 19:04:52,709 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:04:51" (1/1) ... [2021-11-25 19:04:52,789 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:04:51" (1/1) ... [2021-11-25 19:04:52,789 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:04:51" (1/1) ... [2021-11-25 19:04:53,200 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:04:51" (1/1) ... [2021-11-25 19:04:53,305 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:04:51" (1/1) ... [2021-11-25 19:04:53,332 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:04:51" (1/1) ... [2021-11-25 19:04:53,543 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 19:04:53,544 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 19:04:53,545 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 19:04:53,545 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 19:04:53,562 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:04:51" (1/1) ... [2021-11-25 19:04:53,570 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 19:04:53,594 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa6a7100-47d2-48d9-b60b-5cdd109346cb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:04:53,639 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa6a7100-47d2-48d9-b60b-5cdd109346cb/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 19:04:53,701 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa6a7100-47d2-48d9-b60b-5cdd109346cb/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 19:04:53,738 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 19:04:53,738 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads [2021-11-25 19:04:53,739 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads [2021-11-25 19:04:53,739 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2021-11-25 19:04:53,739 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2021-11-25 19:04:53,739 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels [2021-11-25 19:04:53,740 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels [2021-11-25 19:04:53,740 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events [2021-11-25 19:04:53,740 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events [2021-11-25 19:04:53,740 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread [2021-11-25 19:04:53,741 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread [2021-11-25 19:04:53,741 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events [2021-11-25 19:04:53,741 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events [2021-11-25 19:04:53,741 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 19:04:53,741 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 19:04:53,742 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 19:04:53,978 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 19:04:53,979 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 19:05:01,896 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 19:05:05,117 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 19:05:05,117 INFO L301 CfgBuilder]: Removed 17 assume(true) statements. [2021-11-25 19:05:05,122 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 07:05:05 BoogieIcfgContainer [2021-11-25 19:05:05,122 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 19:05:05,124 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 19:05:05,124 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 19:05:05,127 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 19:05:05,127 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 07:04:46" (1/3) ... [2021-11-25 19:05:05,128 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2d715533 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 07:05:05, skipping insertion in model container [2021-11-25 19:05:05,128 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:04:51" (2/3) ... [2021-11-25 19:05:05,129 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2d715533 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 07:05:05, skipping insertion in model container [2021-11-25 19:05:05,129 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 07:05:05" (3/3) ... [2021-11-25 19:05:05,130 INFO L111 eAbstractionObserver]: Analyzing ICFG Problem05_label42+token_ring.13.cil-2.c [2021-11-25 19:05:05,135 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 19:05:05,135 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-25 19:05:05,203 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 19:05:05,211 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 19:05:05,212 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-25 19:05:05,298 INFO L276 IsEmpty]: Start isEmpty. Operand has 1842 states, 1806 states have (on average 1.9540420819490587) internal successors, (3529), 1809 states have internal predecessors, (3529), 27 states have call successors, (27), 6 states have call predecessors, (27), 6 states have return successors, (27), 27 states have call predecessors, (27), 27 states have call successors, (27) [2021-11-25 19:05:05,317 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-25 19:05:05,317 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:05:05,318 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:05:05,319 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:05:05,325 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:05:05,326 INFO L85 PathProgramCache]: Analyzing trace with hash -1029859456, now seen corresponding path program 1 times [2021-11-25 19:05:05,336 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:05:05,336 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [770016639] [2021-11-25 19:05:05,336 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:05:05,338 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:05:05,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:05:05,803 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 19:05:05,804 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:05:05,804 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [770016639] [2021-11-25 19:05:05,805 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [770016639] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:05:05,805 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:05:05,806 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 19:05:05,807 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [636714764] [2021-11-25 19:05:05,808 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:05:05,813 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:05:05,813 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:05:05,864 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:05:05,865 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:05:05,872 INFO L87 Difference]: Start difference. First operand has 1842 states, 1806 states have (on average 1.9540420819490587) internal successors, (3529), 1809 states have internal predecessors, (3529), 27 states have call successors, (27), 6 states have call predecessors, (27), 6 states have return successors, (27), 27 states have call predecessors, (27), 27 states have call successors, (27) Second operand has 4 states, 4 states have (on average 15.0) internal successors, (60), 4 states have internal predecessors, (60), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-25 19:05:07,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:05:07,106 INFO L93 Difference]: Finished difference Result 3866 states and 7483 transitions. [2021-11-25 19:05:07,110 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:05:07,111 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 15.0) internal successors, (60), 4 states have internal predecessors, (60), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 70 [2021-11-25 19:05:07,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:05:07,154 INFO L225 Difference]: With dead ends: 3866 [2021-11-25 19:05:07,154 INFO L226 Difference]: Without dead ends: 2023 [2021-11-25 19:05:07,172 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 19:05:07,176 INFO L933 BasicCegarLoop]: 3541 mSDtfsCounter, 3812 mSDsluCounter, 3753 mSDsCounter, 0 mSdLazyCounter, 742 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3812 SdHoareTripleChecker+Valid, 6980 SdHoareTripleChecker+Invalid, 756 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 742 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:05:07,178 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3812 Valid, 6980 Invalid, 756 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [14 Valid, 742 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-25 19:05:07,204 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2023 states. [2021-11-25 19:05:07,360 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2023 to 2022. [2021-11-25 19:05:07,368 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2022 states, 1958 states have (on average 1.916241062308478) internal successors, (3752), 1961 states have internal predecessors, (3752), 50 states have call successors, (50), 12 states have call predecessors, (50), 12 states have return successors, (50), 49 states have call predecessors, (50), 50 states have call successors, (50) [2021-11-25 19:05:07,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2022 states to 2022 states and 3852 transitions. [2021-11-25 19:05:07,386 INFO L78 Accepts]: Start accepts. Automaton has 2022 states and 3852 transitions. Word has length 70 [2021-11-25 19:05:07,386 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:05:07,387 INFO L470 AbstractCegarLoop]: Abstraction has 2022 states and 3852 transitions. [2021-11-25 19:05:07,387 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 15.0) internal successors, (60), 4 states have internal predecessors, (60), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-25 19:05:07,388 INFO L276 IsEmpty]: Start isEmpty. Operand 2022 states and 3852 transitions. [2021-11-25 19:05:07,402 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-11-25 19:05:07,405 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:05:07,406 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 1, 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 19:05:07,406 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-25 19:05:07,406 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:05:07,407 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:05:07,408 INFO L85 PathProgramCache]: Analyzing trace with hash -1019021321, now seen corresponding path program 1 times [2021-11-25 19:05:07,408 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:05:07,408 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1154323422] [2021-11-25 19:05:07,408 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:05:07,408 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:05:07,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:05:07,638 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-25 19:05:07,639 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:05:07,639 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1154323422] [2021-11-25 19:05:07,639 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1154323422] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:05:07,640 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1328558612] [2021-11-25 19:05:07,640 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:05:07,640 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:05:07,641 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa6a7100-47d2-48d9-b60b-5cdd109346cb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:05:07,642 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa6a7100-47d2-48d9-b60b-5cdd109346cb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:05:07,650 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa6a7100-47d2-48d9-b60b-5cdd109346cb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 19:05:07,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:05:07,930 INFO L263 TraceCheckSpWp]: Trace formula consists of 1116 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 19:05:07,940 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:05:08,207 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 29 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-25 19:05:08,207 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:05:08,208 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1328558612] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:05:08,208 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:05:08,208 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-25 19:05:08,209 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1677356857] [2021-11-25 19:05:08,209 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:05:08,210 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:05:08,210 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:05:08,211 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:05:08,211 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 19:05:08,211 INFO L87 Difference]: Start difference. First operand 2022 states and 3852 transitions. Second operand has 3 states, 3 states have (on average 35.666666666666664) internal successors, (107), 2 states have internal predecessors, (107), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-25 19:05:09,015 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:05:09,016 INFO L93 Difference]: Finished difference Result 2767 states and 5025 transitions. [2021-11-25 19:05:09,016 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:05:09,017 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 35.666666666666664) internal successors, (107), 2 states have internal predecessors, (107), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 143 [2021-11-25 19:05:09,017 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:05:09,040 INFO L225 Difference]: With dead ends: 2767 [2021-11-25 19:05:09,040 INFO L226 Difference]: Without dead ends: 2391 [2021-11-25 19:05:09,043 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 143 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 19:05:09,045 INFO L933 BasicCegarLoop]: 3360 mSDtfsCounter, 3525 mSDsluCounter, 286 mSDsCounter, 0 mSdLazyCounter, 322 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3525 SdHoareTripleChecker+Valid, 3600 SdHoareTripleChecker+Invalid, 324 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 322 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 19:05:09,046 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3525 Valid, 3600 Invalid, 324 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 322 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 19:05:09,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2391 states. [2021-11-25 19:05:09,148 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2391 to 2387. [2021-11-25 19:05:09,156 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2387 states, 2267 states have (on average 1.8619320688134098) internal successors, (4221), 2271 states have internal predecessors, (4221), 94 states have call successors, (94), 24 states have call predecessors, (94), 24 states have return successors, (94), 92 states have call predecessors, (94), 94 states have call successors, (94) [2021-11-25 19:05:09,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2387 states to 2387 states and 4409 transitions. [2021-11-25 19:05:09,179 INFO L78 Accepts]: Start accepts. Automaton has 2387 states and 4409 transitions. Word has length 143 [2021-11-25 19:05:09,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:05:09,180 INFO L470 AbstractCegarLoop]: Abstraction has 2387 states and 4409 transitions. [2021-11-25 19:05:09,180 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 35.666666666666664) internal successors, (107), 2 states have internal predecessors, (107), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-25 19:05:09,180 INFO L276 IsEmpty]: Start isEmpty. Operand 2387 states and 4409 transitions. [2021-11-25 19:05:09,187 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-11-25 19:05:09,187 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:05:09,188 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 1, 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 19:05:09,232 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa6a7100-47d2-48d9-b60b-5cdd109346cb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-25 19:05:09,409 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa6a7100-47d2-48d9-b60b-5cdd109346cb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:05:09,410 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:05:09,411 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:05:09,411 INFO L85 PathProgramCache]: Analyzing trace with hash -1605039111, now seen corresponding path program 1 times [2021-11-25 19:05:09,411 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:05:09,412 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1549022787] [2021-11-25 19:05:09,412 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:05:09,412 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:05:09,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:05:09,615 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-25 19:05:09,615 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:05:09,615 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1549022787] [2021-11-25 19:05:09,616 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1549022787] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:05:09,616 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1886303317] [2021-11-25 19:05:09,616 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:05:09,616 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:05:09,617 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa6a7100-47d2-48d9-b60b-5cdd109346cb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:05:09,627 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa6a7100-47d2-48d9-b60b-5cdd109346cb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:05:09,654 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa6a7100-47d2-48d9-b60b-5cdd109346cb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-25 19:05:09,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:05:09,926 INFO L263 TraceCheckSpWp]: Trace formula consists of 1110 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 19:05:09,935 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:05:10,288 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-25 19:05:10,288 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:05:10,290 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1886303317] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:05:10,290 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:05:10,291 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-25 19:05:10,291 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2122723157] [2021-11-25 19:05:10,291 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:05:10,294 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:05:10,295 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:05:10,295 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:05:10,296 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 19:05:10,296 INFO L87 Difference]: Start difference. First operand 2387 states and 4409 transitions. Second operand has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 2 states have internal predecessors, (95), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-25 19:05:10,948 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:05:10,948 INFO L93 Difference]: Finished difference Result 3856 states and 6716 transitions. [2021-11-25 19:05:10,949 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:05:10,949 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 2 states have internal predecessors, (95), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 143 [2021-11-25 19:05:10,950 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:05:10,981 INFO L225 Difference]: With dead ends: 3856 [2021-11-25 19:05:10,981 INFO L226 Difference]: Without dead ends: 3115 [2021-11-25 19:05:10,987 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 143 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 19:05:10,992 INFO L933 BasicCegarLoop]: 3348 mSDtfsCounter, 3537 mSDsluCounter, 286 mSDsCounter, 0 mSdLazyCounter, 319 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3537 SdHoareTripleChecker+Valid, 3588 SdHoareTripleChecker+Invalid, 321 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 319 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 19:05:10,994 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3537 Valid, 3588 Invalid, 321 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 319 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 19:05:11,002 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3115 states. [2021-11-25 19:05:11,160 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3115 to 3109. [2021-11-25 19:05:11,173 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3109 states, 2879 states have (on average 1.7877735324765545) internal successors, (5147), 2885 states have internal predecessors, (5147), 180 states have call successors, (180), 48 states have call predecessors, (180), 48 states have return successors, (180), 176 states have call predecessors, (180), 180 states have call successors, (180) [2021-11-25 19:05:11,198 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3109 states to 3109 states and 5507 transitions. [2021-11-25 19:05:11,199 INFO L78 Accepts]: Start accepts. Automaton has 3109 states and 5507 transitions. Word has length 143 [2021-11-25 19:05:11,200 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:05:11,200 INFO L470 AbstractCegarLoop]: Abstraction has 3109 states and 5507 transitions. [2021-11-25 19:05:11,201 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 2 states have internal predecessors, (95), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-25 19:05:11,201 INFO L276 IsEmpty]: Start isEmpty. Operand 3109 states and 5507 transitions. [2021-11-25 19:05:11,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-11-25 19:05:11,210 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:05:11,210 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 1, 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 19:05:11,251 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa6a7100-47d2-48d9-b60b-5cdd109346cb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-25 19:05:11,425 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa6a7100-47d2-48d9-b60b-5cdd109346cb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:05:11,425 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:05:11,426 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:05:11,426 INFO L85 PathProgramCache]: Analyzing trace with hash -1947259653, now seen corresponding path program 1 times [2021-11-25 19:05:11,426 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:05:11,427 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [914272735] [2021-11-25 19:05:11,427 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:05:11,427 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:05:11,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:05:11,560 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-25 19:05:11,561 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:05:11,561 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [914272735] [2021-11-25 19:05:11,561 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [914272735] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:05:11,561 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1421389409] [2021-11-25 19:05:11,562 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:05:11,562 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:05:11,562 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa6a7100-47d2-48d9-b60b-5cdd109346cb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:05:11,563 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa6a7100-47d2-48d9-b60b-5cdd109346cb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:05:11,585 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa6a7100-47d2-48d9-b60b-5cdd109346cb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-25 19:05:11,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:05:11,845 INFO L263 TraceCheckSpWp]: Trace formula consists of 1104 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 19:05:11,852 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:05:12,133 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 35 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-25 19:05:12,133 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:05:12,134 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1421389409] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:05:12,134 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:05:12,134 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-25 19:05:12,135 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [108190] [2021-11-25 19:05:12,135 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:05:12,136 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:05:12,136 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:05:12,137 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:05:12,137 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 19:05:12,137 INFO L87 Difference]: Start difference. First operand 3109 states and 5507 transitions. Second operand has 3 states, 3 states have (on average 37.666666666666664) internal successors, (113), 2 states have internal predecessors, (113), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-25 19:05:12,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:05:12,876 INFO L93 Difference]: Finished difference Result 6010 states and 10048 transitions. [2021-11-25 19:05:12,877 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:05:12,881 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 37.666666666666664) internal successors, (113), 2 states have internal predecessors, (113), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 143 [2021-11-25 19:05:12,881 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:05:12,923 INFO L225 Difference]: With dead ends: 6010 [2021-11-25 19:05:12,924 INFO L226 Difference]: Without dead ends: 4547 [2021-11-25 19:05:12,933 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 143 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 19:05:12,937 INFO L933 BasicCegarLoop]: 3326 mSDtfsCounter, 3519 mSDsluCounter, 286 mSDsCounter, 0 mSdLazyCounter, 319 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3519 SdHoareTripleChecker+Valid, 3566 SdHoareTripleChecker+Invalid, 321 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 319 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 19:05:12,940 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3519 Valid, 3566 Invalid, 321 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 319 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 19:05:12,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4547 states. [2021-11-25 19:05:13,186 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4547 to 4537. [2021-11-25 19:05:13,206 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4537 states, 4091 states have (on average 1.7049621119530678) internal successors, (6975), 4101 states have internal predecessors, (6975), 348 states have call successors, (348), 96 states have call predecessors, (348), 96 states have return successors, (348), 340 states have call predecessors, (348), 348 states have call successors, (348) [2021-11-25 19:05:13,244 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4537 states to 4537 states and 7671 transitions. [2021-11-25 19:05:13,247 INFO L78 Accepts]: Start accepts. Automaton has 4537 states and 7671 transitions. Word has length 143 [2021-11-25 19:05:13,247 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:05:13,247 INFO L470 AbstractCegarLoop]: Abstraction has 4537 states and 7671 transitions. [2021-11-25 19:05:13,248 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 37.666666666666664) internal successors, (113), 2 states have internal predecessors, (113), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-25 19:05:13,248 INFO L276 IsEmpty]: Start isEmpty. Operand 4537 states and 7671 transitions. [2021-11-25 19:05:13,262 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-11-25 19:05:13,262 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:05:13,263 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 1, 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 19:05:13,309 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa6a7100-47d2-48d9-b60b-5cdd109346cb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-25 19:05:13,477 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa6a7100-47d2-48d9-b60b-5cdd109346cb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:05:13,478 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:05:13,478 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:05:13,478 INFO L85 PathProgramCache]: Analyzing trace with hash -719787395, now seen corresponding path program 1 times [2021-11-25 19:05:13,479 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:05:13,479 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1353767315] [2021-11-25 19:05:13,479 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:05:13,479 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:05:13,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:05:13,643 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-25 19:05:13,643 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:05:13,643 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1353767315] [2021-11-25 19:05:13,643 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1353767315] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:05:13,644 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [368784435] [2021-11-25 19:05:13,644 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:05:13,644 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:05:13,644 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa6a7100-47d2-48d9-b60b-5cdd109346cb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:05:13,650 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa6a7100-47d2-48d9-b60b-5cdd109346cb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:05:13,674 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa6a7100-47d2-48d9-b60b-5cdd109346cb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-25 19:05:13,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:05:13,937 INFO L263 TraceCheckSpWp]: Trace formula consists of 1098 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 19:05:13,944 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:05:14,413 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-25 19:05:14,414 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:05:14,414 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [368784435] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:05:14,414 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:05:14,415 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-25 19:05:14,415 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [834689697] [2021-11-25 19:05:14,415 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:05:14,416 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:05:14,417 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:05:14,417 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:05:14,417 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 19:05:14,418 INFO L87 Difference]: Start difference. First operand 4537 states and 7671 transitions. Second operand has 3 states, 3 states have (on average 29.666666666666668) internal successors, (89), 2 states have internal predecessors, (89), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-25 19:05:15,140 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:05:15,140 INFO L93 Difference]: Finished difference Result 10270 states and 16612 transitions. [2021-11-25 19:05:15,140 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:05:15,141 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 29.666666666666668) internal successors, (89), 2 states have internal predecessors, (89), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 143 [2021-11-25 19:05:15,143 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:05:15,205 INFO L225 Difference]: With dead ends: 10270 [2021-11-25 19:05:15,206 INFO L226 Difference]: Without dead ends: 7379 [2021-11-25 19:05:15,222 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 143 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 19:05:15,223 INFO L933 BasicCegarLoop]: 3346 mSDtfsCounter, 3543 mSDsluCounter, 286 mSDsCounter, 0 mSdLazyCounter, 319 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3543 SdHoareTripleChecker+Valid, 3586 SdHoareTripleChecker+Invalid, 321 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 319 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 19:05:15,224 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3543 Valid, 3586 Invalid, 321 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 319 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 19:05:15,235 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7379 states. [2021-11-25 19:05:15,528 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7379 to 7361. [2021-11-25 19:05:15,546 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7361 states, 6491 states have (on average 1.6304113387767678) internal successors, (10583), 6509 states have internal predecessors, (10583), 676 states have call successors, (676), 192 states have call predecessors, (676), 192 states have return successors, (676), 660 states have call predecessors, (676), 676 states have call successors, (676) [2021-11-25 19:05:15,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7361 states to 7361 states and 11935 transitions. [2021-11-25 19:05:15,581 INFO L78 Accepts]: Start accepts. Automaton has 7361 states and 11935 transitions. Word has length 143 [2021-11-25 19:05:15,582 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:05:15,582 INFO L470 AbstractCegarLoop]: Abstraction has 7361 states and 11935 transitions. [2021-11-25 19:05:15,582 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 29.666666666666668) internal successors, (89), 2 states have internal predecessors, (89), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-25 19:05:15,582 INFO L276 IsEmpty]: Start isEmpty. Operand 7361 states and 11935 transitions. [2021-11-25 19:05:15,603 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-11-25 19:05:15,603 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:05:15,603 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 1, 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 19:05:15,649 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa6a7100-47d2-48d9-b60b-5cdd109346cb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-25 19:05:15,817 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa6a7100-47d2-48d9-b60b-5cdd109346cb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:05:15,818 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:05:15,818 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:05:15,818 INFO L85 PathProgramCache]: Analyzing trace with hash 1017299455, now seen corresponding path program 1 times [2021-11-25 19:05:15,819 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:05:15,819 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [226992297] [2021-11-25 19:05:15,819 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:05:15,819 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:05:15,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:05:15,953 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-25 19:05:15,954 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:05:15,954 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [226992297] [2021-11-25 19:05:15,954 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [226992297] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:05:15,954 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [28099728] [2021-11-25 19:05:15,954 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:05:15,955 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:05:15,955 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa6a7100-47d2-48d9-b60b-5cdd109346cb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:05:15,956 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa6a7100-47d2-48d9-b60b-5cdd109346cb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:05:15,975 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa6a7100-47d2-48d9-b60b-5cdd109346cb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-25 19:05:16,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:05:16,229 INFO L263 TraceCheckSpWp]: Trace formula consists of 1092 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 19:05:16,234 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:05:16,511 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-25 19:05:16,511 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:05:16,511 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [28099728] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:05:16,511 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:05:16,512 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-25 19:05:16,512 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1934104322] [2021-11-25 19:05:16,513 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:05:16,514 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:05:16,514 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:05:16,514 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:05:16,515 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 19:05:16,515 INFO L87 Difference]: Start difference. First operand 7361 states and 11935 transitions. Second operand has 3 states, 3 states have (on average 28.666666666666668) internal successors, (86), 2 states have internal predecessors, (86), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-25 19:05:17,464 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:05:17,464 INFO L93 Difference]: Finished difference Result 18694 states and 29540 transitions. [2021-11-25 19:05:17,465 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:05:17,465 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 28.666666666666668) internal successors, (86), 2 states have internal predecessors, (86), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 143 [2021-11-25 19:05:17,465 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:05:17,568 INFO L225 Difference]: With dead ends: 18694 [2021-11-25 19:05:17,568 INFO L226 Difference]: Without dead ends: 12979 [2021-11-25 19:05:17,612 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 143 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 19:05:17,613 INFO L933 BasicCegarLoop]: 3356 mSDtfsCounter, 3546 mSDsluCounter, 286 mSDsCounter, 0 mSdLazyCounter, 322 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3546 SdHoareTripleChecker+Valid, 3596 SdHoareTripleChecker+Invalid, 324 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 322 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 19:05:17,613 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3546 Valid, 3596 Invalid, 324 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 322 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 19:05:17,642 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12979 states. [2021-11-25 19:05:18,307 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12979 to 12945. [2021-11-25 19:05:18,346 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12945 states, 11243 states have (on average 1.574579738503958) internal successors, (17703), 11277 states have internal predecessors, (17703), 1316 states have call successors, (1316), 384 states have call predecessors, (1316), 384 states have return successors, (1316), 1284 states have call predecessors, (1316), 1316 states have call successors, (1316) [2021-11-25 19:05:18,437 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12945 states to 12945 states and 20335 transitions. [2021-11-25 19:05:18,440 INFO L78 Accepts]: Start accepts. Automaton has 12945 states and 20335 transitions. Word has length 143 [2021-11-25 19:05:18,440 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:05:18,443 INFO L470 AbstractCegarLoop]: Abstraction has 12945 states and 20335 transitions. [2021-11-25 19:05:18,444 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 28.666666666666668) internal successors, (86), 2 states have internal predecessors, (86), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-25 19:05:18,444 INFO L276 IsEmpty]: Start isEmpty. Operand 12945 states and 20335 transitions. [2021-11-25 19:05:18,479 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-11-25 19:05:18,480 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:05:18,480 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 1, 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 19:05:18,524 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa6a7100-47d2-48d9-b60b-5cdd109346cb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-25 19:05:18,697 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa6a7100-47d2-48d9-b60b-5cdd109346cb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-25 19:05:18,697 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:05:18,698 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:05:18,698 INFO L85 PathProgramCache]: Analyzing trace with hash 510698301, now seen corresponding path program 1 times [2021-11-25 19:05:18,698 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:05:18,698 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1508756458] [2021-11-25 19:05:18,698 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:05:18,698 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:05:18,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:05:18,838 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-25 19:05:18,839 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:05:18,839 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1508756458] [2021-11-25 19:05:18,839 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1508756458] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:05:18,839 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [905808360] [2021-11-25 19:05:18,839 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:05:18,840 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:05:18,840 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa6a7100-47d2-48d9-b60b-5cdd109346cb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:05:18,841 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa6a7100-47d2-48d9-b60b-5cdd109346cb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:05:18,869 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa6a7100-47d2-48d9-b60b-5cdd109346cb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-25 19:05:19,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:05:19,121 INFO L263 TraceCheckSpWp]: Trace formula consists of 1086 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 19:05:19,125 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:05:19,444 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 38 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-25 19:05:19,445 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:05:19,445 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [905808360] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:05:19,445 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:05:19,446 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-25 19:05:19,446 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1914803247] [2021-11-25 19:05:19,446 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:05:19,447 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:05:19,447 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:05:19,448 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:05:19,448 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 19:05:19,448 INFO L87 Difference]: Start difference. First operand 12945 states and 20335 transitions. Second operand has 3 states, 3 states have (on average 38.666666666666664) internal successors, (116), 2 states have internal predecessors, (116), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-25 19:05:20,896 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:05:20,896 INFO L93 Difference]: Finished difference Result 35350 states and 54996 transitions. [2021-11-25 19:05:20,897 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:05:20,897 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 38.666666666666664) internal successors, (116), 2 states have internal predecessors, (116), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 143 [2021-11-25 19:05:20,898 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:05:21,023 INFO L225 Difference]: With dead ends: 35350 [2021-11-25 19:05:21,024 INFO L226 Difference]: Without dead ends: 24051 [2021-11-25 19:05:21,087 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 143 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 19:05:21,088 INFO L933 BasicCegarLoop]: 3326 mSDtfsCounter, 3516 mSDsluCounter, 286 mSDsCounter, 0 mSdLazyCounter, 319 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3516 SdHoareTripleChecker+Valid, 3566 SdHoareTripleChecker+Invalid, 321 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 319 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 19:05:21,089 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3516 Valid, 3566 Invalid, 321 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 319 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 19:05:21,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24051 states. [2021-11-25 19:05:21,969 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24051 to 23985. [2021-11-25 19:05:22,008 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23985 states, 20651 states have (on average 1.53750423708295) internal successors, (31751), 20717 states have internal predecessors, (31751), 2564 states have call successors, (2564), 768 states have call predecessors, (2564), 768 states have return successors, (2564), 2500 states have call predecessors, (2564), 2564 states have call successors, (2564) [2021-11-25 19:05:22,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23985 states to 23985 states and 36879 transitions. [2021-11-25 19:05:22,104 INFO L78 Accepts]: Start accepts. Automaton has 23985 states and 36879 transitions. Word has length 143 [2021-11-25 19:05:22,104 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:05:22,104 INFO L470 AbstractCegarLoop]: Abstraction has 23985 states and 36879 transitions. [2021-11-25 19:05:22,104 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 38.666666666666664) internal successors, (116), 2 states have internal predecessors, (116), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-25 19:05:22,105 INFO L276 IsEmpty]: Start isEmpty. Operand 23985 states and 36879 transitions. [2021-11-25 19:05:22,156 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-11-25 19:05:22,156 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:05:22,156 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 1, 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 19:05:22,195 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa6a7100-47d2-48d9-b60b-5cdd109346cb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-25 19:05:22,380 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa6a7100-47d2-48d9-b60b-5cdd109346cb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-11-25 19:05:22,381 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:05:22,381 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:05:22,381 INFO L85 PathProgramCache]: Analyzing trace with hash -898521861, now seen corresponding path program 1 times [2021-11-25 19:05:22,381 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:05:22,381 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1065948065] [2021-11-25 19:05:22,382 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:05:22,382 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:05:22,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:05:22,490 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-25 19:05:22,490 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:05:22,490 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1065948065] [2021-11-25 19:05:22,491 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1065948065] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:05:22,491 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [584809033] [2021-11-25 19:05:22,491 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:05:22,491 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:05:22,491 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa6a7100-47d2-48d9-b60b-5cdd109346cb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:05:22,492 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa6a7100-47d2-48d9-b60b-5cdd109346cb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:05:22,497 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa6a7100-47d2-48d9-b60b-5cdd109346cb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-25 19:05:22,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:05:22,747 INFO L263 TraceCheckSpWp]: Trace formula consists of 1080 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 19:05:22,751 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:05:23,023 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 23 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-25 19:05:23,023 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:05:23,024 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [584809033] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:05:23,024 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:05:23,024 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-25 19:05:23,024 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [518507186] [2021-11-25 19:05:23,025 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:05:23,025 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:05:23,025 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:05:23,026 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:05:23,026 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 19:05:23,026 INFO L87 Difference]: Start difference. First operand 23985 states and 36879 transitions. Second operand has 3 states, 3 states have (on average 33.666666666666664) internal successors, (101), 2 states have internal predecessors, (101), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-25 19:05:25,315 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:05:25,315 INFO L93 Difference]: Finished difference Result 68278 states and 105108 transitions. [2021-11-25 19:05:25,316 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:05:25,316 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 33.666666666666664) internal successors, (101), 2 states have internal predecessors, (101), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 143 [2021-11-25 19:05:25,317 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:05:25,610 INFO L225 Difference]: With dead ends: 68278 [2021-11-25 19:05:25,610 INFO L226 Difference]: Without dead ends: 45939 [2021-11-25 19:05:25,714 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 143 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 19:05:25,715 INFO L933 BasicCegarLoop]: 3326 mSDtfsCounter, 3531 mSDsluCounter, 286 mSDsCounter, 0 mSdLazyCounter, 319 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3531 SdHoareTripleChecker+Valid, 3566 SdHoareTripleChecker+Invalid, 321 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 319 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 19:05:25,716 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3531 Valid, 3566 Invalid, 321 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 319 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 19:05:25,776 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45939 states. [2021-11-25 19:05:27,714 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45939 to 45809. [2021-11-25 19:05:27,816 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45809 states, 39275 states have (on average 1.514016549968173) internal successors, (59463), 39405 states have internal predecessors, (59463), 4996 states have call successors, (4996), 1536 states have call predecessors, (4996), 1536 states have return successors, (4996), 4868 states have call predecessors, (4996), 4996 states have call successors, (4996) [2021-11-25 19:05:28,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45809 states to 45809 states and 69455 transitions. [2021-11-25 19:05:28,048 INFO L78 Accepts]: Start accepts. Automaton has 45809 states and 69455 transitions. Word has length 143 [2021-11-25 19:05:28,048 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:05:28,048 INFO L470 AbstractCegarLoop]: Abstraction has 45809 states and 69455 transitions. [2021-11-25 19:05:28,049 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 33.666666666666664) internal successors, (101), 2 states have internal predecessors, (101), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-25 19:05:28,049 INFO L276 IsEmpty]: Start isEmpty. Operand 45809 states and 69455 transitions. [2021-11-25 19:05:28,353 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-11-25 19:05:28,354 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:05:28,354 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 1, 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 19:05:28,399 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa6a7100-47d2-48d9-b60b-5cdd109346cb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-25 19:05:28,581 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa6a7100-47d2-48d9-b60b-5cdd109346cb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:05:28,582 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:05:28,582 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:05:28,582 INFO L85 PathProgramCache]: Analyzing trace with hash 2020683645, now seen corresponding path program 1 times [2021-11-25 19:05:28,583 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:05:28,583 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [15045061] [2021-11-25 19:05:28,583 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:05:28,583 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:05:28,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:05:28,759 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-25 19:05:28,759 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:05:28,759 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [15045061] [2021-11-25 19:05:28,760 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [15045061] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:05:28,760 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:05:28,760 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-25 19:05:28,764 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2132962120] [2021-11-25 19:05:28,764 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:05:28,765 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 19:05:28,765 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:05:28,766 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 19:05:28,766 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-25 19:05:28,767 INFO L87 Difference]: Start difference. First operand 45809 states and 69455 transitions. Second operand has 6 states, 6 states have (on average 13.833333333333334) internal successors, (83), 6 states have internal predecessors, (83), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-25 19:05:33,653 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:05:33,653 INFO L93 Difference]: Finished difference Result 156917 states and 235730 transitions. [2021-11-25 19:05:33,653 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-25 19:05:33,654 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.833333333333334) internal successors, (83), 6 states have internal predecessors, (83), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 143 [2021-11-25 19:05:33,654 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:05:34,812 INFO L225 Difference]: With dead ends: 156917 [2021-11-25 19:05:34,812 INFO L226 Difference]: Without dead ends: 112755 [2021-11-25 19:05:34,975 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2021-11-25 19:05:34,978 INFO L933 BasicCegarLoop]: 3329 mSDtfsCounter, 4482 mSDsluCounter, 7126 mSDsCounter, 0 mSdLazyCounter, 949 mSolverCounterSat, 152 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4504 SdHoareTripleChecker+Valid, 9930 SdHoareTripleChecker+Invalid, 1101 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 152 IncrementalHoareTripleChecker+Valid, 949 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:05:34,979 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4504 Valid, 9930 Invalid, 1101 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [152 Valid, 949 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-25 19:05:35,117 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112755 states. [2021-11-25 19:05:39,380 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112755 to 88433. [2021-11-25 19:05:39,509 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88433 states, 75627 states have (on average 1.4988165602232006) internal successors, (113351), 75885 states have internal predecessors, (113351), 9732 states have call successors, (9732), 3072 states have call predecessors, (9732), 3072 states have return successors, (9732), 9476 states have call predecessors, (9732), 9732 states have call successors, (9732) [2021-11-25 19:05:40,454 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88433 states to 88433 states and 132815 transitions. [2021-11-25 19:05:40,466 INFO L78 Accepts]: Start accepts. Automaton has 88433 states and 132815 transitions. Word has length 143 [2021-11-25 19:05:40,473 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:05:40,473 INFO L470 AbstractCegarLoop]: Abstraction has 88433 states and 132815 transitions. [2021-11-25 19:05:40,473 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.833333333333334) internal successors, (83), 6 states have internal predecessors, (83), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-25 19:05:40,474 INFO L276 IsEmpty]: Start isEmpty. Operand 88433 states and 132815 transitions. [2021-11-25 19:05:40,615 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2021-11-25 19:05:40,615 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:05:40,616 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 1, 1, 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 19:05:40,616 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-25 19:05:40,617 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:05:40,617 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:05:40,617 INFO L85 PathProgramCache]: Analyzing trace with hash -1402596620, now seen corresponding path program 1 times [2021-11-25 19:05:40,618 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:05:40,618 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [19601522] [2021-11-25 19:05:40,618 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:05:40,618 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:05:40,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:05:40,816 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-25 19:05:40,816 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:05:40,817 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [19601522] [2021-11-25 19:05:40,817 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [19601522] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:05:40,817 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:05:40,817 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-25 19:05:40,818 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [965133607] [2021-11-25 19:05:40,818 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:05:40,819 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 19:05:40,819 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:05:40,819 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 19:05:40,819 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-25 19:05:40,820 INFO L87 Difference]: Start difference. First operand 88433 states and 132815 transitions. Second operand has 6 states, 6 states have (on average 14.0) internal successors, (84), 6 states have internal predecessors, (84), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-25 19:05:47,277 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:05:47,277 INFO L93 Difference]: Finished difference Result 238325 states and 357457 transitions. [2021-11-25 19:05:47,278 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-25 19:05:47,278 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 14.0) internal successors, (84), 6 states have internal predecessors, (84), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 144 [2021-11-25 19:05:47,278 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:05:48,417 INFO L225 Difference]: With dead ends: 238325 [2021-11-25 19:05:48,417 INFO L226 Difference]: Without dead ends: 151539 [2021-11-25 19:05:48,705 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2021-11-25 19:05:48,705 INFO L933 BasicCegarLoop]: 3321 mSDtfsCounter, 4253 mSDsluCounter, 10682 mSDsCounter, 0 mSdLazyCounter, 1257 mSolverCounterSat, 160 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4259 SdHoareTripleChecker+Valid, 13220 SdHoareTripleChecker+Invalid, 1417 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 160 IncrementalHoareTripleChecker+Valid, 1257 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:05:48,706 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4259 Valid, 13220 Invalid, 1417 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [160 Valid, 1257 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2021-11-25 19:05:48,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151539 states. [2021-11-25 19:05:55,430 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151539 to 130801. [2021-11-25 19:05:55,539 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 130801 states, 111723 states have (on average 1.4911790768239306) internal successors, (166599), 112109 states have internal predecessors, (166599), 14468 states have call successors, (14468), 4608 states have call predecessors, (14468), 4608 states have return successors, (14468), 14084 states have call predecessors, (14468), 14468 states have call successors, (14468) [2021-11-25 19:05:56,193 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130801 states to 130801 states and 195535 transitions. [2021-11-25 19:05:56,218 INFO L78 Accepts]: Start accepts. Automaton has 130801 states and 195535 transitions. Word has length 144 [2021-11-25 19:05:56,219 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:05:56,219 INFO L470 AbstractCegarLoop]: Abstraction has 130801 states and 195535 transitions. [2021-11-25 19:05:56,219 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 14.0) internal successors, (84), 6 states have internal predecessors, (84), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-25 19:05:56,219 INFO L276 IsEmpty]: Start isEmpty. Operand 130801 states and 195535 transitions. [2021-11-25 19:05:56,425 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2021-11-25 19:05:56,425 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:05:56,426 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 1, 1, 1, 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 19:05:56,426 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-25 19:05:56,427 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:05:56,427 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:05:56,427 INFO L85 PathProgramCache]: Analyzing trace with hash -1958810147, now seen corresponding path program 1 times [2021-11-25 19:05:56,428 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:05:56,428 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1722326595] [2021-11-25 19:05:56,428 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:05:56,428 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:05:56,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:05:56,596 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-25 19:05:56,596 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:05:56,597 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1722326595] [2021-11-25 19:05:56,597 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1722326595] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:05:56,597 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:05:56,597 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-25 19:05:56,597 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1158231613] [2021-11-25 19:05:56,597 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:05:56,599 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 19:05:56,599 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:05:56,600 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 19:05:56,600 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-25 19:05:56,600 INFO L87 Difference]: Start difference. First operand 130801 states and 195535 transitions. Second operand has 6 states, 6 states have (on average 14.166666666666666) internal successors, (85), 6 states have internal predecessors, (85), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8)