./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/openssl-simplified/s3_srvr_4.cil.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 53f42b1a Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca271e0f-f703-412d-9887-7b6a67ee5ecb/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca271e0f-f703-412d-9887-7b6a67ee5ecb/bin/utaipan-TEXQjIfE4P/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca271e0f-f703-412d-9887-7b6a67ee5ecb/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca271e0f-f703-412d-9887-7b6a67ee5ecb/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/openssl-simplified/s3_srvr_4.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca271e0f-f703-412d-9887-7b6a67ee5ecb/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca271e0f-f703-412d-9887-7b6a67ee5ecb/bin/utaipan-TEXQjIfE4P --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 f559dc59bc463f9a27da280f1f7098996cb99e14cb280bd541f8697a124cb729 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-21 00:21:26,837 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-21 00:21:26,841 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-21 00:21:26,915 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-21 00:21:26,916 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-21 00:21:26,922 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-21 00:21:26,924 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-21 00:21:26,929 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-21 00:21:26,933 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-21 00:21:26,940 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-21 00:21:26,941 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-21 00:21:26,944 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-21 00:21:26,944 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-21 00:21:26,948 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-21 00:21:26,951 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-21 00:21:26,956 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-21 00:21:26,958 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-21 00:21:26,960 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-21 00:21:26,964 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-21 00:21:26,972 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-21 00:21:26,974 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-21 00:21:26,980 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-21 00:21:26,985 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-21 00:21:26,986 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-21 00:21:26,998 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-21 00:21:26,999 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-21 00:21:26,999 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-21 00:21:27,002 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-21 00:21:27,003 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-21 00:21:27,005 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-21 00:21:27,006 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-21 00:21:27,007 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-21 00:21:27,009 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-21 00:21:27,011 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-21 00:21:27,013 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-21 00:21:27,013 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-21 00:21:27,014 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-21 00:21:27,015 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-21 00:21:27,015 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-21 00:21:27,016 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-21 00:21:27,017 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-21 00:21:27,019 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca271e0f-f703-412d-9887-7b6a67ee5ecb/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-21 00:21:27,075 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-21 00:21:27,075 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-21 00:21:27,076 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-21 00:21:27,077 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-21 00:21:27,078 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-21 00:21:27,086 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-21 00:21:27,086 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-21 00:21:27,087 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-21 00:21:27,087 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-21 00:21:27,087 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-21 00:21:27,089 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-21 00:21:27,089 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-21 00:21:27,089 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-21 00:21:27,090 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-21 00:21:27,090 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-21 00:21:27,090 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-21 00:21:27,091 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-21 00:21:27,091 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-21 00:21:27,092 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-21 00:21:27,092 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-21 00:21:27,092 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-21 00:21:27,093 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-21 00:21:27,093 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-21 00:21:27,093 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-21 00:21:27,094 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-21 00:21:27,094 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-21 00:21:27,094 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-21 00:21:27,095 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-21 00:21:27,095 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-21 00:21:27,096 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-21 00:21:27,096 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-21 00:21:27,096 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-21 00:21:27,097 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 00:21:27,097 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-21 00:21:27,097 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-21 00:21:27,098 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-21 00:21:27,098 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-21 00:21:27,098 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-21 00:21:27,099 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-21 00:21:27,099 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-21 00:21:27,099 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-21 00:21:27,100 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_ca271e0f-f703-412d-9887-7b6a67ee5ecb/bin/utaipan-TEXQjIfE4P/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca271e0f-f703-412d-9887-7b6a67ee5ecb/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> f559dc59bc463f9a27da280f1f7098996cb99e14cb280bd541f8697a124cb729 [2021-11-21 00:21:27,469 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-21 00:21:27,501 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-21 00:21:27,506 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-21 00:21:27,508 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-21 00:21:27,509 INFO L275 PluginConnector]: CDTParser initialized [2021-11-21 00:21:27,511 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca271e0f-f703-412d-9887-7b6a67ee5ecb/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/openssl-simplified/s3_srvr_4.cil.c [2021-11-21 00:21:27,604 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca271e0f-f703-412d-9887-7b6a67ee5ecb/bin/utaipan-TEXQjIfE4P/data/627740dc4/06e3f0811bd24d7394a12e3a3c43ef1b/FLAGddf3499d2 [2021-11-21 00:21:28,271 INFO L306 CDTParser]: Found 1 translation units. [2021-11-21 00:21:28,272 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca271e0f-f703-412d-9887-7b6a67ee5ecb/sv-benchmarks/c/openssl-simplified/s3_srvr_4.cil.c [2021-11-21 00:21:28,293 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca271e0f-f703-412d-9887-7b6a67ee5ecb/bin/utaipan-TEXQjIfE4P/data/627740dc4/06e3f0811bd24d7394a12e3a3c43ef1b/FLAGddf3499d2 [2021-11-21 00:21:28,518 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca271e0f-f703-412d-9887-7b6a67ee5ecb/bin/utaipan-TEXQjIfE4P/data/627740dc4/06e3f0811bd24d7394a12e3a3c43ef1b [2021-11-21 00:21:28,522 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-21 00:21:28,525 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-21 00:21:28,532 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-21 00:21:28,532 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-21 00:21:28,536 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-21 00:21:28,537 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 12:21:28" (1/1) ... [2021-11-21 00:21:28,541 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@f9776a0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:21:28, skipping insertion in model container [2021-11-21 00:21:28,542 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 12:21:28" (1/1) ... [2021-11-21 00:21:28,552 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-21 00:21:28,611 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-21 00:21:28,907 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_ca271e0f-f703-412d-9887-7b6a67ee5ecb/sv-benchmarks/c/openssl-simplified/s3_srvr_4.cil.c[42875,42888] [2021-11-21 00:21:28,916 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 00:21:28,926 INFO L203 MainTranslator]: Completed pre-run [2021-11-21 00:21:29,043 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_ca271e0f-f703-412d-9887-7b6a67ee5ecb/sv-benchmarks/c/openssl-simplified/s3_srvr_4.cil.c[42875,42888] [2021-11-21 00:21:29,062 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 00:21:29,079 INFO L208 MainTranslator]: Completed translation [2021-11-21 00:21:29,079 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:21:29 WrapperNode [2021-11-21 00:21:29,080 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-21 00:21:29,081 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-21 00:21:29,081 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-21 00:21:29,082 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-21 00:21:29,091 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:21:29" (1/1) ... [2021-11-21 00:21:29,104 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:21:29" (1/1) ... [2021-11-21 00:21:29,161 INFO L137 Inliner]: procedures = 15, calls = 8, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 546 [2021-11-21 00:21:29,161 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-21 00:21:29,162 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-21 00:21:29,162 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-21 00:21:29,163 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-21 00:21:29,189 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:21:29" (1/1) ... [2021-11-21 00:21:29,189 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:21:29" (1/1) ... [2021-11-21 00:21:29,195 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:21:29" (1/1) ... [2021-11-21 00:21:29,195 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:21:29" (1/1) ... [2021-11-21 00:21:29,212 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:21:29" (1/1) ... [2021-11-21 00:21:29,221 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:21:29" (1/1) ... [2021-11-21 00:21:29,225 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:21:29" (1/1) ... [2021-11-21 00:21:29,231 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-21 00:21:29,243 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-21 00:21:29,243 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-21 00:21:29,244 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-21 00:21:29,245 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:21:29" (1/1) ... [2021-11-21 00:21:29,257 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 00:21:29,273 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca271e0f-f703-412d-9887-7b6a67ee5ecb/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:21:29,292 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca271e0f-f703-412d-9887-7b6a67ee5ecb/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-21 00:21:29,297 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca271e0f-f703-412d-9887-7b6a67ee5ecb/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-21 00:21:29,346 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-21 00:21:29,346 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-21 00:21:29,347 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-21 00:21:29,347 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-21 00:21:29,458 INFO L236 CfgBuilder]: Building ICFG [2021-11-21 00:21:29,460 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-21 00:21:29,485 WARN L815 $ProcedureCfgBuilder]: Label in the middle of a codeblock. [2021-11-21 00:21:30,326 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##90: assume false; [2021-11-21 00:21:30,326 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##91: assume !false; [2021-11-21 00:21:30,326 INFO L277 CfgBuilder]: Performing block encoding [2021-11-21 00:21:30,561 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-21 00:21:30,562 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-21 00:21:30,565 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 12:21:30 BoogieIcfgContainer [2021-11-21 00:21:30,565 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-21 00:21:30,568 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-21 00:21:30,568 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-21 00:21:30,572 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-21 00:21:30,572 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 12:21:28" (1/3) ... [2021-11-21 00:21:30,574 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5e3ff361 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 12:21:30, skipping insertion in model container [2021-11-21 00:21:30,574 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:21:29" (2/3) ... [2021-11-21 00:21:30,574 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5e3ff361 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 12:21:30, skipping insertion in model container [2021-11-21 00:21:30,575 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 12:21:30" (3/3) ... [2021-11-21 00:21:30,576 INFO L111 eAbstractionObserver]: Analyzing ICFG s3_srvr_4.cil.c [2021-11-21 00:21:30,587 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-21 00:21:30,588 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-21 00:21:30,673 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-21 00:21:30,685 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 [2021-11-21 00:21:30,686 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-21 00:21:30,725 INFO L276 IsEmpty]: Start isEmpty. Operand has 106 states, 104 states have (on average 1.7692307692307692) internal successors, (184), 105 states have internal predecessors, (184), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:21:30,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-11-21 00:21:30,744 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:21:30,745 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] [2021-11-21 00:21:30,746 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:21:30,753 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:21:30,753 INFO L85 PathProgramCache]: Analyzing trace with hash -1369161449, now seen corresponding path program 1 times [2021-11-21 00:21:30,765 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:21:30,766 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [388283878] [2021-11-21 00:21:30,766 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:21:30,768 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:21:30,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:21:31,133 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:21:31,134 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:21:31,135 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [388283878] [2021-11-21 00:21:31,136 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [388283878] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:21:31,137 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:21:31,137 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-21 00:21:31,139 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1060210439] [2021-11-21 00:21:31,141 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:21:31,147 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:21:31,148 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:21:31,183 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:21:31,184 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:21:31,187 INFO L87 Difference]: Start difference. First operand has 106 states, 104 states have (on average 1.7692307692307692) internal successors, (184), 105 states have internal predecessors, (184), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 13.0) internal successors, (39), 2 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:21:31,552 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:21:31,552 INFO L93 Difference]: Finished difference Result 258 states and 452 transitions. [2021-11-21 00:21:31,554 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:21:31,555 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 13.0) internal successors, (39), 2 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 39 [2021-11-21 00:21:31,556 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:21:31,567 INFO L225 Difference]: With dead ends: 258 [2021-11-21 00:21:31,567 INFO L226 Difference]: Without dead ends: 148 [2021-11-21 00:21:31,570 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:21:31,574 INFO L933 BasicCegarLoop]: 99 mSDtfsCounter, 122 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 122 mSolverCounterSat, 56 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 122 SdHoareTripleChecker+Valid, 115 SdHoareTripleChecker+Invalid, 178 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 56 IncrementalHoareTripleChecker+Valid, 122 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:21:31,575 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [122 Valid, 115 Invalid, 178 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [56 Valid, 122 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 00:21:31,593 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2021-11-21 00:21:31,620 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 143. [2021-11-21 00:21:31,622 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 142 states have (on average 1.619718309859155) internal successors, (230), 142 states have internal predecessors, (230), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:21:31,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 230 transitions. [2021-11-21 00:21:31,626 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 230 transitions. Word has length 39 [2021-11-21 00:21:31,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:21:31,627 INFO L470 AbstractCegarLoop]: Abstraction has 143 states and 230 transitions. [2021-11-21 00:21:31,627 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 13.0) internal successors, (39), 2 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:21:31,627 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 230 transitions. [2021-11-21 00:21:31,629 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-21 00:21:31,630 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:21:31,630 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] [2021-11-21 00:21:31,630 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-21 00:21:31,630 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:21:31,631 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:21:31,631 INFO L85 PathProgramCache]: Analyzing trace with hash 498513343, now seen corresponding path program 1 times [2021-11-21 00:21:31,631 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:21:31,632 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1179244443] [2021-11-21 00:21:31,632 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:21:31,632 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:21:31,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:21:31,714 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:21:31,714 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:21:31,715 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1179244443] [2021-11-21 00:21:31,715 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1179244443] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:21:31,717 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:21:31,717 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-21 00:21:31,717 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1859593856] [2021-11-21 00:21:31,717 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:21:31,719 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:21:31,719 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:21:31,719 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:21:31,720 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:21:31,720 INFO L87 Difference]: Start difference. First operand 143 states and 230 transitions. Second operand has 3 states, 3 states have (on average 13.333333333333334) internal successors, (40), 2 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:21:32,030 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:21:32,030 INFO L93 Difference]: Finished difference Result 330 states and 540 transitions. [2021-11-21 00:21:32,031 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:21:32,031 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 13.333333333333334) internal successors, (40), 2 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 40 [2021-11-21 00:21:32,032 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:21:32,039 INFO L225 Difference]: With dead ends: 330 [2021-11-21 00:21:32,040 INFO L226 Difference]: Without dead ends: 187 [2021-11-21 00:21:32,047 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:21:32,049 INFO L933 BasicCegarLoop]: 76 mSDtfsCounter, 95 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 117 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 95 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 172 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 117 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:21:32,050 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [95 Valid, 88 Invalid, 172 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [55 Valid, 117 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 00:21:32,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2021-11-21 00:21:32,084 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 182. [2021-11-21 00:21:32,088 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 182 states, 181 states have (on average 1.6740331491712708) internal successors, (303), 181 states have internal predecessors, (303), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:21:32,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 182 states to 182 states and 303 transitions. [2021-11-21 00:21:32,096 INFO L78 Accepts]: Start accepts. Automaton has 182 states and 303 transitions. Word has length 40 [2021-11-21 00:21:32,097 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:21:32,098 INFO L470 AbstractCegarLoop]: Abstraction has 182 states and 303 transitions. [2021-11-21 00:21:32,099 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 13.333333333333334) internal successors, (40), 2 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:21:32,100 INFO L276 IsEmpty]: Start isEmpty. Operand 182 states and 303 transitions. [2021-11-21 00:21:32,103 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-21 00:21:32,105 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:21:32,110 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:21:32,111 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-21 00:21:32,111 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:21:32,112 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:21:32,112 INFO L85 PathProgramCache]: Analyzing trace with hash 1644979707, now seen corresponding path program 1 times [2021-11-21 00:21:32,112 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:21:32,113 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [537728519] [2021-11-21 00:21:32,114 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:21:32,114 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:21:32,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:21:32,242 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 23 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:21:32,243 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:21:32,243 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [537728519] [2021-11-21 00:21:32,244 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [537728519] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:21:32,244 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:21:32,244 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-21 00:21:32,244 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2028565348] [2021-11-21 00:21:32,245 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:21:32,245 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:21:32,246 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:21:32,246 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:21:32,246 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:21:32,247 INFO L87 Difference]: Start difference. First operand 182 states and 303 transitions. Second operand has 3 states, 3 states have (on average 22.0) internal successors, (66), 2 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:21:32,435 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:21:32,435 INFO L93 Difference]: Finished difference Result 391 states and 658 transitions. [2021-11-21 00:21:32,436 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:21:32,436 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 22.0) internal successors, (66), 2 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 66 [2021-11-21 00:21:32,436 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:21:32,439 INFO L225 Difference]: With dead ends: 391 [2021-11-21 00:21:32,439 INFO L226 Difference]: Without dead ends: 211 [2021-11-21 00:21:32,443 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:21:32,444 INFO L933 BasicCegarLoop]: 75 mSDtfsCounter, 105 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 109 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 105 SdHoareTripleChecker+Valid, 86 SdHoareTripleChecker+Invalid, 148 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 109 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:21:32,445 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [105 Valid, 86 Invalid, 148 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 109 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 00:21:32,446 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 211 states. [2021-11-21 00:21:32,461 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 211 to 211. [2021-11-21 00:21:32,462 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 211 states, 210 states have (on average 1.6904761904761905) internal successors, (355), 210 states have internal predecessors, (355), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:21:32,463 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 211 states to 211 states and 355 transitions. [2021-11-21 00:21:32,464 INFO L78 Accepts]: Start accepts. Automaton has 211 states and 355 transitions. Word has length 66 [2021-11-21 00:21:32,464 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:21:32,464 INFO L470 AbstractCegarLoop]: Abstraction has 211 states and 355 transitions. [2021-11-21 00:21:32,465 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 22.0) internal successors, (66), 2 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:21:32,465 INFO L276 IsEmpty]: Start isEmpty. Operand 211 states and 355 transitions. [2021-11-21 00:21:32,468 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-11-21 00:21:32,469 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:21:32,469 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 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] [2021-11-21 00:21:32,469 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-21 00:21:32,470 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:21:32,470 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:21:32,470 INFO L85 PathProgramCache]: Analyzing trace with hash 1127266290, now seen corresponding path program 1 times [2021-11-21 00:21:32,471 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:21:32,471 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [752126107] [2021-11-21 00:21:32,471 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:21:32,471 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:21:32,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:21:32,530 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-21 00:21:32,530 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:21:32,530 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [752126107] [2021-11-21 00:21:32,530 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [752126107] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:21:32,531 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:21:32,531 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-21 00:21:32,531 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1749931312] [2021-11-21 00:21:32,531 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:21:32,532 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:21:32,532 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:21:32,532 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:21:32,533 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:21:32,533 INFO L87 Difference]: Start difference. First operand 211 states and 355 transitions. Second operand has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 2 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:21:32,682 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:21:32,682 INFO L93 Difference]: Finished difference Result 435 states and 732 transitions. [2021-11-21 00:21:32,683 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:21:32,683 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 2 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 77 [2021-11-21 00:21:32,683 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:21:32,685 INFO L225 Difference]: With dead ends: 435 [2021-11-21 00:21:32,685 INFO L226 Difference]: Without dead ends: 226 [2021-11-21 00:21:32,686 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:21:32,698 INFO L933 BasicCegarLoop]: 83 mSDtfsCounter, 124 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 91 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 124 SdHoareTripleChecker+Valid, 92 SdHoareTripleChecker+Invalid, 118 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 91 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:21:32,699 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [124 Valid, 92 Invalid, 118 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 91 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:21:32,701 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 226 states. [2021-11-21 00:21:32,724 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 226 to 224. [2021-11-21 00:21:32,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 224 states, 223 states have (on average 1.6771300448430493) internal successors, (374), 223 states have internal predecessors, (374), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:21:32,730 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 224 states to 224 states and 374 transitions. [2021-11-21 00:21:32,730 INFO L78 Accepts]: Start accepts. Automaton has 224 states and 374 transitions. Word has length 77 [2021-11-21 00:21:32,730 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:21:32,732 INFO L470 AbstractCegarLoop]: Abstraction has 224 states and 374 transitions. [2021-11-21 00:21:32,733 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 2 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:21:32,733 INFO L276 IsEmpty]: Start isEmpty. Operand 224 states and 374 transitions. [2021-11-21 00:21:32,737 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-11-21 00:21:32,742 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:21:32,743 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:21:32,743 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-21 00:21:32,743 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:21:32,744 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:21:32,744 INFO L85 PathProgramCache]: Analyzing trace with hash -756135960, now seen corresponding path program 1 times [2021-11-21 00:21:32,744 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:21:32,744 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1886553920] [2021-11-21 00:21:32,744 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:21:32,745 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:21:32,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:21:32,852 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 32 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:21:32,854 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:21:32,854 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1886553920] [2021-11-21 00:21:32,854 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1886553920] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:21:32,854 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:21:32,855 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-21 00:21:32,855 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [100798126] [2021-11-21 00:21:32,855 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:21:32,856 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:21:32,859 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:21:32,859 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:21:32,860 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:21:32,860 INFO L87 Difference]: Start difference. First operand 224 states and 374 transitions. Second operand has 3 states, 3 states have (on average 25.666666666666668) internal successors, (77), 2 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:21:33,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:21:33,022 INFO L93 Difference]: Finished difference Result 487 states and 819 transitions. [2021-11-21 00:21:33,022 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:21:33,023 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 25.666666666666668) internal successors, (77), 2 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 77 [2021-11-21 00:21:33,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:21:33,025 INFO L225 Difference]: With dead ends: 487 [2021-11-21 00:21:33,026 INFO L226 Difference]: Without dead ends: 265 [2021-11-21 00:21:33,031 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:21:33,033 INFO L933 BasicCegarLoop]: 75 mSDtfsCounter, 99 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 117 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 99 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 168 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 117 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:21:33,034 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [99 Valid, 84 Invalid, 168 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 117 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:21:33,035 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 265 states. [2021-11-21 00:21:33,059 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 265 to 262. [2021-11-21 00:21:33,060 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 262 states, 261 states have (on average 1.6934865900383143) internal successors, (442), 261 states have internal predecessors, (442), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:21:33,062 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 262 states to 262 states and 442 transitions. [2021-11-21 00:21:33,062 INFO L78 Accepts]: Start accepts. Automaton has 262 states and 442 transitions. Word has length 77 [2021-11-21 00:21:33,063 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:21:33,063 INFO L470 AbstractCegarLoop]: Abstraction has 262 states and 442 transitions. [2021-11-21 00:21:33,067 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 25.666666666666668) internal successors, (77), 2 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:21:33,068 INFO L276 IsEmpty]: Start isEmpty. Operand 262 states and 442 transitions. [2021-11-21 00:21:33,072 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-11-21 00:21:33,072 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:21:33,073 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 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] [2021-11-21 00:21:33,074 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-21 00:21:33,075 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:21:33,075 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:21:33,076 INFO L85 PathProgramCache]: Analyzing trace with hash -692996897, now seen corresponding path program 1 times [2021-11-21 00:21:33,076 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:21:33,076 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [374633002] [2021-11-21 00:21:33,076 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:21:33,077 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:21:33,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:21:33,151 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 16 proven. 0 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-21 00:21:33,152 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:21:33,152 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [374633002] [2021-11-21 00:21:33,152 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [374633002] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:21:33,152 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:21:33,153 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-21 00:21:33,153 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1209016707] [2021-11-21 00:21:33,153 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:21:33,153 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:21:33,154 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:21:33,154 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:21:33,154 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:21:33,154 INFO L87 Difference]: Start difference. First operand 262 states and 442 transitions. Second operand has 3 states, 3 states have (on average 18.0) internal successors, (54), 2 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:21:33,266 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:21:33,266 INFO L93 Difference]: Finished difference Result 524 states and 884 transitions. [2021-11-21 00:21:33,266 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:21:33,267 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 2 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 78 [2021-11-21 00:21:33,267 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:21:33,269 INFO L225 Difference]: With dead ends: 524 [2021-11-21 00:21:33,270 INFO L226 Difference]: Without dead ends: 264 [2021-11-21 00:21:33,270 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:21:33,272 INFO L933 BasicCegarLoop]: 75 mSDtfsCounter, 123 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 90 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 123 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 119 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 90 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:21:33,272 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [123 Valid, 84 Invalid, 119 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 90 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:21:33,274 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 264 states. [2021-11-21 00:21:33,286 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 264 to 262. [2021-11-21 00:21:33,287 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 262 states, 261 states have (on average 1.6781609195402298) internal successors, (438), 261 states have internal predecessors, (438), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:21:33,290 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 262 states to 262 states and 438 transitions. [2021-11-21 00:21:33,291 INFO L78 Accepts]: Start accepts. Automaton has 262 states and 438 transitions. Word has length 78 [2021-11-21 00:21:33,291 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:21:33,291 INFO L470 AbstractCegarLoop]: Abstraction has 262 states and 438 transitions. [2021-11-21 00:21:33,291 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 2 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:21:33,291 INFO L276 IsEmpty]: Start isEmpty. Operand 262 states and 438 transitions. [2021-11-21 00:21:33,294 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-11-21 00:21:33,294 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:21:33,295 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:21:33,295 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-21 00:21:33,295 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:21:33,296 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:21:33,296 INFO L85 PathProgramCache]: Analyzing trace with hash -299185360, now seen corresponding path program 1 times [2021-11-21 00:21:33,296 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:21:33,297 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [500628249] [2021-11-21 00:21:33,297 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:21:33,297 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:21:33,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:21:33,396 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 33 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:21:33,398 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:21:33,398 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [500628249] [2021-11-21 00:21:33,399 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [500628249] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:21:33,399 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:21:33,399 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-21 00:21:33,399 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [507164911] [2021-11-21 00:21:33,401 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:21:33,401 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:21:33,402 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:21:33,402 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:21:33,402 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:21:33,402 INFO L87 Difference]: Start difference. First operand 262 states and 438 transitions. Second operand has 3 states, 3 states have (on average 26.0) internal successors, (78), 2 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:21:33,559 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:21:33,559 INFO L93 Difference]: Finished difference Result 525 states and 877 transitions. [2021-11-21 00:21:33,559 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:21:33,559 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 26.0) internal successors, (78), 2 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 78 [2021-11-21 00:21:33,560 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:21:33,562 INFO L225 Difference]: With dead ends: 525 [2021-11-21 00:21:33,562 INFO L226 Difference]: Without dead ends: 263 [2021-11-21 00:21:33,563 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:21:33,564 INFO L933 BasicCegarLoop]: 77 mSDtfsCounter, 96 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 115 mSolverCounterSat, 54 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 96 SdHoareTripleChecker+Valid, 86 SdHoareTripleChecker+Invalid, 169 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 54 IncrementalHoareTripleChecker+Valid, 115 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:21:33,564 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [96 Valid, 86 Invalid, 169 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [54 Valid, 115 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:21:33,565 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 263 states. [2021-11-21 00:21:33,575 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 263 to 260. [2021-11-21 00:21:33,576 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 260 states, 259 states have (on average 1.6718146718146718) internal successors, (433), 259 states have internal predecessors, (433), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:21:33,577 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 260 states to 260 states and 433 transitions. [2021-11-21 00:21:33,577 INFO L78 Accepts]: Start accepts. Automaton has 260 states and 433 transitions. Word has length 78 [2021-11-21 00:21:33,579 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:21:33,579 INFO L470 AbstractCegarLoop]: Abstraction has 260 states and 433 transitions. [2021-11-21 00:21:33,579 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 26.0) internal successors, (78), 2 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:21:33,580 INFO L276 IsEmpty]: Start isEmpty. Operand 260 states and 433 transitions. [2021-11-21 00:21:33,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-11-21 00:21:33,581 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:21:33,581 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 3, 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] [2021-11-21 00:21:33,581 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-21 00:21:33,582 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:21:33,583 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:21:33,583 INFO L85 PathProgramCache]: Analyzing trace with hash 985529901, now seen corresponding path program 1 times [2021-11-21 00:21:33,584 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:21:33,584 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1125026815] [2021-11-21 00:21:33,584 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:21:33,584 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:21:33,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:21:33,630 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-21 00:21:33,630 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:21:33,630 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1125026815] [2021-11-21 00:21:33,630 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1125026815] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:21:33,630 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:21:33,630 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-21 00:21:33,631 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1891894243] [2021-11-21 00:21:33,631 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:21:33,631 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:21:33,631 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:21:33,631 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:21:33,632 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:21:33,632 INFO L87 Difference]: Start difference. First operand 260 states and 433 transitions. Second operand has 3 states, 3 states have (on average 18.0) internal successors, (54), 2 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:21:33,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:21:33,752 INFO L93 Difference]: Finished difference Result 525 states and 873 transitions. [2021-11-21 00:21:33,753 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:21:33,753 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 2 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 86 [2021-11-21 00:21:33,753 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:21:33,755 INFO L225 Difference]: With dead ends: 525 [2021-11-21 00:21:33,755 INFO L226 Difference]: Without dead ends: 267 [2021-11-21 00:21:33,756 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:21:33,757 INFO L933 BasicCegarLoop]: 75 mSDtfsCounter, 129 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 85 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 129 SdHoareTripleChecker+Valid, 89 SdHoareTripleChecker+Invalid, 109 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 85 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:21:33,757 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [129 Valid, 89 Invalid, 109 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 85 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:21:33,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 267 states. [2021-11-21 00:21:33,767 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 267 to 267. [2021-11-21 00:21:33,768 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 267 states, 266 states have (on average 1.6390977443609023) internal successors, (436), 266 states have internal predecessors, (436), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:21:33,769 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 267 states to 267 states and 436 transitions. [2021-11-21 00:21:33,770 INFO L78 Accepts]: Start accepts. Automaton has 267 states and 436 transitions. Word has length 86 [2021-11-21 00:21:33,770 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:21:33,770 INFO L470 AbstractCegarLoop]: Abstraction has 267 states and 436 transitions. [2021-11-21 00:21:33,770 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 2 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:21:33,770 INFO L276 IsEmpty]: Start isEmpty. Operand 267 states and 436 transitions. [2021-11-21 00:21:33,772 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2021-11-21 00:21:33,772 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:21:33,772 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:21:33,772 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-21 00:21:33,772 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:21:33,773 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:21:33,773 INFO L85 PathProgramCache]: Analyzing trace with hash -1237277515, now seen corresponding path program 1 times [2021-11-21 00:21:33,773 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:21:33,773 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [286648090] [2021-11-21 00:21:33,773 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:21:33,774 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:21:33,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:21:33,802 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 42 proven. 0 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-21 00:21:33,803 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:21:33,803 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [286648090] [2021-11-21 00:21:33,803 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [286648090] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:21:33,803 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:21:33,803 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-21 00:21:33,804 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1601999722] [2021-11-21 00:21:33,804 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:21:33,804 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:21:33,804 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:21:33,805 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:21:33,805 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:21:33,805 INFO L87 Difference]: Start difference. First operand 267 states and 436 transitions. Second operand has 3 states, 3 states have (on average 22.333333333333332) internal successors, (67), 2 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:21:33,933 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:21:33,933 INFO L93 Difference]: Finished difference Result 561 states and 919 transitions. [2021-11-21 00:21:33,934 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:21:33,934 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 22.333333333333332) internal successors, (67), 2 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 91 [2021-11-21 00:21:33,934 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:21:33,936 INFO L225 Difference]: With dead ends: 561 [2021-11-21 00:21:33,936 INFO L226 Difference]: Without dead ends: 296 [2021-11-21 00:21:33,937 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:21:33,939 INFO L933 BasicCegarLoop]: 77 mSDtfsCounter, 107 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 105 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 107 SdHoareTripleChecker+Valid, 86 SdHoareTripleChecker+Invalid, 144 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 105 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:21:33,939 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [107 Valid, 86 Invalid, 144 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 105 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:21:33,940 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 296 states. [2021-11-21 00:21:33,952 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 296 to 294. [2021-11-21 00:21:33,953 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 294 states, 293 states have (on average 1.6348122866894197) internal successors, (479), 293 states have internal predecessors, (479), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:21:33,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 294 states to 294 states and 479 transitions. [2021-11-21 00:21:33,955 INFO L78 Accepts]: Start accepts. Automaton has 294 states and 479 transitions. Word has length 91 [2021-11-21 00:21:33,955 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:21:33,955 INFO L470 AbstractCegarLoop]: Abstraction has 294 states and 479 transitions. [2021-11-21 00:21:33,955 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 22.333333333333332) internal successors, (67), 2 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:21:33,955 INFO L276 IsEmpty]: Start isEmpty. Operand 294 states and 479 transitions. [2021-11-21 00:21:33,957 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2021-11-21 00:21:33,957 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:21:33,957 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:21:33,957 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-21 00:21:33,958 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:21:33,958 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:21:33,958 INFO L85 PathProgramCache]: Analyzing trace with hash 528550722, now seen corresponding path program 1 times [2021-11-21 00:21:33,959 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:21:33,959 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1871016195] [2021-11-21 00:21:33,959 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:21:33,959 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:21:33,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:21:33,988 INFO L134 CoverageAnalysis]: Checked inductivity of 69 backedges. 44 proven. 0 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-21 00:21:33,988 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:21:33,988 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1871016195] [2021-11-21 00:21:33,988 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1871016195] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:21:33,988 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:21:33,989 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-21 00:21:33,989 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [793745498] [2021-11-21 00:21:33,989 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:21:33,989 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:21:33,989 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:21:33,990 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:21:33,990 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:21:33,990 INFO L87 Difference]: Start difference. First operand 294 states and 479 transitions. Second operand has 3 states, 3 states have (on average 22.666666666666668) internal successors, (68), 2 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:21:34,115 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:21:34,116 INFO L93 Difference]: Finished difference Result 588 states and 958 transitions. [2021-11-21 00:21:34,116 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:21:34,116 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 22.666666666666668) internal successors, (68), 2 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 92 [2021-11-21 00:21:34,117 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:21:34,119 INFO L225 Difference]: With dead ends: 588 [2021-11-21 00:21:34,119 INFO L226 Difference]: Without dead ends: 296 [2021-11-21 00:21:34,120 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:21:34,121 INFO L933 BasicCegarLoop]: 77 mSDtfsCounter, 106 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 103 mSolverCounterSat, 43 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 106 SdHoareTripleChecker+Valid, 86 SdHoareTripleChecker+Invalid, 146 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 43 IncrementalHoareTripleChecker+Valid, 103 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:21:34,122 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [106 Valid, 86 Invalid, 146 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [43 Valid, 103 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:21:34,123 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 296 states. [2021-11-21 00:21:34,133 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 296 to 294. [2021-11-21 00:21:34,134 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 294 states, 293 states have (on average 1.621160409556314) internal successors, (475), 293 states have internal predecessors, (475), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:21:34,136 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 294 states to 294 states and 475 transitions. [2021-11-21 00:21:34,136 INFO L78 Accepts]: Start accepts. Automaton has 294 states and 475 transitions. Word has length 92 [2021-11-21 00:21:34,136 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:21:34,137 INFO L470 AbstractCegarLoop]: Abstraction has 294 states and 475 transitions. [2021-11-21 00:21:34,137 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 22.666666666666668) internal successors, (68), 2 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:21:34,137 INFO L276 IsEmpty]: Start isEmpty. Operand 294 states and 475 transitions. [2021-11-21 00:21:34,138 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-11-21 00:21:34,138 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:21:34,139 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:21:34,139 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-21 00:21:34,139 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:21:34,140 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:21:34,140 INFO L85 PathProgramCache]: Analyzing trace with hash -1011437019, now seen corresponding path program 1 times [2021-11-21 00:21:34,140 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:21:34,140 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2106952983] [2021-11-21 00:21:34,140 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:21:34,140 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:21:34,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:21:34,171 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 38 proven. 0 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-21 00:21:34,171 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:21:34,171 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2106952983] [2021-11-21 00:21:34,172 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2106952983] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:21:34,172 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:21:34,172 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-21 00:21:34,172 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [902668149] [2021-11-21 00:21:34,172 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:21:34,173 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:21:34,173 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:21:34,173 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:21:34,174 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:21:34,174 INFO L87 Difference]: Start difference. First operand 294 states and 475 transitions. Second operand has 3 states, 3 states have (on average 23.0) internal successors, (69), 2 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:21:34,319 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:21:34,319 INFO L93 Difference]: Finished difference Result 619 states and 1004 transitions. [2021-11-21 00:21:34,319 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:21:34,320 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 23.0) internal successors, (69), 2 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 93 [2021-11-21 00:21:34,320 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:21:34,322 INFO L225 Difference]: With dead ends: 619 [2021-11-21 00:21:34,322 INFO L226 Difference]: Without dead ends: 327 [2021-11-21 00:21:34,323 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:21:34,324 INFO L933 BasicCegarLoop]: 77 mSDtfsCounter, 109 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 101 mSolverCounterSat, 42 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 109 SdHoareTripleChecker+Valid, 94 SdHoareTripleChecker+Invalid, 143 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 42 IncrementalHoareTripleChecker+Valid, 101 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:21:34,324 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [109 Valid, 94 Invalid, 143 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [42 Valid, 101 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:21:34,326 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 327 states. [2021-11-21 00:21:34,339 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 327 to 319. [2021-11-21 00:21:34,340 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 319 states, 318 states have (on average 1.6132075471698113) internal successors, (513), 318 states have internal predecessors, (513), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:21:34,342 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 319 states to 319 states and 513 transitions. [2021-11-21 00:21:34,342 INFO L78 Accepts]: Start accepts. Automaton has 319 states and 513 transitions. Word has length 93 [2021-11-21 00:21:34,342 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:21:34,343 INFO L470 AbstractCegarLoop]: Abstraction has 319 states and 513 transitions. [2021-11-21 00:21:34,343 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 23.0) internal successors, (69), 2 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:21:34,343 INFO L276 IsEmpty]: Start isEmpty. Operand 319 states and 513 transitions. [2021-11-21 00:21:34,345 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-11-21 00:21:34,345 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:21:34,345 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2021-11-21 00:21:34,345 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-11-21 00:21:34,346 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:21:34,346 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:21:34,346 INFO L85 PathProgramCache]: Analyzing trace with hash 715226441, now seen corresponding path program 1 times [2021-11-21 00:21:34,346 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:21:34,347 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1570238126] [2021-11-21 00:21:34,347 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:21:34,347 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:21:34,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:21:34,378 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 26 proven. 0 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-11-21 00:21:34,378 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:21:34,379 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1570238126] [2021-11-21 00:21:34,379 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1570238126] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:21:34,379 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:21:34,379 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-21 00:21:34,379 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [783406921] [2021-11-21 00:21:34,380 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:21:34,380 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:21:34,380 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:21:34,381 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:21:34,381 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:21:34,381 INFO L87 Difference]: Start difference. First operand 319 states and 513 transitions. Second operand has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 2 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:21:34,508 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:21:34,508 INFO L93 Difference]: Finished difference Result 657 states and 1057 transitions. [2021-11-21 00:21:34,509 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:21:34,509 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 2 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 94 [2021-11-21 00:21:34,509 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:21:34,511 INFO L225 Difference]: With dead ends: 657 [2021-11-21 00:21:34,512 INFO L226 Difference]: Without dead ends: 340 [2021-11-21 00:21:34,512 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:21:34,513 INFO L933 BasicCegarLoop]: 77 mSDtfsCounter, 115 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 96 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 115 SdHoareTripleChecker+Valid, 85 SdHoareTripleChecker+Invalid, 129 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 96 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:21:34,513 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [115 Valid, 85 Invalid, 129 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 96 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:21:34,514 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 340 states. [2021-11-21 00:21:34,528 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 340 to 338. [2021-11-21 00:21:34,529 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 338 states, 337 states have (on average 1.596439169139466) internal successors, (538), 337 states have internal predecessors, (538), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:21:34,530 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 338 states to 338 states and 538 transitions. [2021-11-21 00:21:34,531 INFO L78 Accepts]: Start accepts. Automaton has 338 states and 538 transitions. Word has length 94 [2021-11-21 00:21:34,531 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:21:34,531 INFO L470 AbstractCegarLoop]: Abstraction has 338 states and 538 transitions. [2021-11-21 00:21:34,531 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 2 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:21:34,531 INFO L276 IsEmpty]: Start isEmpty. Operand 338 states and 538 transitions. [2021-11-21 00:21:34,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-11-21 00:21:34,533 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:21:34,533 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:21:34,533 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-11-21 00:21:34,534 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:21:34,534 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:21:34,534 INFO L85 PathProgramCache]: Analyzing trace with hash -483942190, now seen corresponding path program 1 times [2021-11-21 00:21:34,534 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:21:34,534 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1478143346] [2021-11-21 00:21:34,535 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:21:34,535 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:21:34,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:21:34,563 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 40 proven. 0 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-21 00:21:34,563 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:21:34,563 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1478143346] [2021-11-21 00:21:34,564 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1478143346] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:21:34,564 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:21:34,564 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-21 00:21:34,564 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [412283578] [2021-11-21 00:21:34,564 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:21:34,565 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:21:34,565 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:21:34,565 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:21:34,565 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:21:34,566 INFO L87 Difference]: Start difference. First operand 338 states and 538 transitions. Second operand has 3 states, 3 states have (on average 23.333333333333332) internal successors, (70), 2 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:21:34,691 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:21:34,691 INFO L93 Difference]: Finished difference Result 682 states and 1087 transitions. [2021-11-21 00:21:34,692 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:21:34,692 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 23.333333333333332) internal successors, (70), 2 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 94 [2021-11-21 00:21:34,692 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:21:34,694 INFO L225 Difference]: With dead ends: 682 [2021-11-21 00:21:34,695 INFO L226 Difference]: Without dead ends: 346 [2021-11-21 00:21:34,695 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:21:34,696 INFO L933 BasicCegarLoop]: 77 mSDtfsCounter, 108 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 101 mSolverCounterSat, 44 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 108 SdHoareTripleChecker+Valid, 94 SdHoareTripleChecker+Invalid, 145 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 44 IncrementalHoareTripleChecker+Valid, 101 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:21:34,697 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [108 Valid, 94 Invalid, 145 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [44 Valid, 101 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:21:34,698 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 346 states. [2021-11-21 00:21:34,711 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 346 to 338. [2021-11-21 00:21:34,712 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 338 states, 337 states have (on average 1.5816023738872405) internal successors, (533), 337 states have internal predecessors, (533), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:21:34,714 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 338 states to 338 states and 533 transitions. [2021-11-21 00:21:34,714 INFO L78 Accepts]: Start accepts. Automaton has 338 states and 533 transitions. Word has length 94 [2021-11-21 00:21:34,714 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:21:34,714 INFO L470 AbstractCegarLoop]: Abstraction has 338 states and 533 transitions. [2021-11-21 00:21:34,715 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 23.333333333333332) internal successors, (70), 2 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:21:34,715 INFO L276 IsEmpty]: Start isEmpty. Operand 338 states and 533 transitions. [2021-11-21 00:21:34,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-11-21 00:21:34,716 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:21:34,717 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2021-11-21 00:21:34,717 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-11-21 00:21:34,717 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:21:34,718 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:21:34,718 INFO L85 PathProgramCache]: Analyzing trace with hash -2090642916, now seen corresponding path program 1 times [2021-11-21 00:21:34,718 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:21:34,718 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1447549143] [2021-11-21 00:21:34,718 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:21:34,719 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:21:34,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:21:34,749 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 28 proven. 0 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-11-21 00:21:34,749 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:21:34,749 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1447549143] [2021-11-21 00:21:34,749 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1447549143] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:21:34,749 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:21:34,750 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-21 00:21:34,750 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [539879578] [2021-11-21 00:21:34,750 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:21:34,750 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:21:34,751 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:21:34,751 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:21:34,751 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:21:34,751 INFO L87 Difference]: Start difference. First operand 338 states and 533 transitions. Second operand has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 2 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:21:34,871 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:21:34,871 INFO L93 Difference]: Finished difference Result 676 states and 1066 transitions. [2021-11-21 00:21:34,871 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:21:34,872 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 2 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 95 [2021-11-21 00:21:34,872 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:21:34,874 INFO L225 Difference]: With dead ends: 676 [2021-11-21 00:21:34,874 INFO L226 Difference]: Without dead ends: 340 [2021-11-21 00:21:34,875 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:21:34,876 INFO L933 BasicCegarLoop]: 77 mSDtfsCounter, 114 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 96 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 114 SdHoareTripleChecker+Valid, 85 SdHoareTripleChecker+Invalid, 131 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 96 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:21:34,876 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [114 Valid, 85 Invalid, 131 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 96 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:21:34,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 340 states. [2021-11-21 00:21:34,891 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 340 to 338. [2021-11-21 00:21:34,892 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 338 states, 337 states have (on average 1.5637982195845697) internal successors, (527), 337 states have internal predecessors, (527), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:21:34,894 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 338 states to 338 states and 527 transitions. [2021-11-21 00:21:34,894 INFO L78 Accepts]: Start accepts. Automaton has 338 states and 527 transitions. Word has length 95 [2021-11-21 00:21:34,898 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:21:34,898 INFO L470 AbstractCegarLoop]: Abstraction has 338 states and 527 transitions. [2021-11-21 00:21:34,899 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 2 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:21:34,899 INFO L276 IsEmpty]: Start isEmpty. Operand 338 states and 527 transitions. [2021-11-21 00:21:34,900 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2021-11-21 00:21:34,900 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:21:34,901 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 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] [2021-11-21 00:21:34,901 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-11-21 00:21:34,901 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:21:34,902 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:21:34,902 INFO L85 PathProgramCache]: Analyzing trace with hash 861766430, now seen corresponding path program 1 times [2021-11-21 00:21:34,902 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:21:34,902 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1874164239] [2021-11-21 00:21:34,902 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:21:34,903 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:21:34,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:21:34,963 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 0 proven. 94 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:21:34,963 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:21:34,963 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1874164239] [2021-11-21 00:21:34,963 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1874164239] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:21:34,964 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1841561162] [2021-11-21 00:21:34,964 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:21:34,964 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:21:34,964 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca271e0f-f703-412d-9887-7b6a67ee5ecb/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:21:34,966 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca271e0f-f703-412d-9887-7b6a67ee5ecb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:21:34,986 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca271e0f-f703-412d-9887-7b6a67ee5ecb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-21 00:21:35,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:21:35,054 INFO L263 TraceCheckSpWp]: Trace formula consists of 255 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-21 00:21:35,062 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:21:35,466 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 0 proven. 94 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:21:35,467 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:21:36,066 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 0 proven. 59 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-21 00:21:36,066 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1841561162] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:21:36,066 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1948851132] [2021-11-21 00:21:36,095 INFO L159 IcfgInterpreter]: Started Sifa with 50 locations of interest [2021-11-21 00:21:36,095 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:21:36,102 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:21:36,106 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:21:36,107 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:23:07,602 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:23:29,069 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:23:29,070 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:23:29,070 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 3] total 7 [2021-11-21 00:23:29,070 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1941682065] [2021-11-21 00:23:29,070 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:23:29,074 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-21 00:23:29,075 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:23:29,075 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-21 00:23:29,077 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=567, Invalid=1983, Unknown=0, NotChecked=0, Total=2550 [2021-11-21 00:23:29,077 INFO L87 Difference]: Start difference. First operand 338 states and 527 transitions. Second operand has 8 states, 8 states have (on average 24.0) internal successors, (192), 7 states have internal predecessors, (192), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:29,347 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:23:29,347 INFO L93 Difference]: Finished difference Result 1904 states and 2984 transitions. [2021-11-21 00:23:29,347 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-21 00:23:29,348 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 24.0) internal successors, (192), 7 states have internal predecessors, (192), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 108 [2021-11-21 00:23:29,348 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:23:29,359 INFO L225 Difference]: With dead ends: 1904 [2021-11-21 00:23:29,359 INFO L226 Difference]: Without dead ends: 1902 [2021-11-21 00:23:29,362 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 327 GetRequests, 265 SyntacticMatches, 13 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 730 ImplicationChecksByTransitivity, 21.5s TimeCoverageRelationStatistics Valid=567, Invalid=1983, Unknown=0, NotChecked=0, Total=2550 [2021-11-21 00:23:29,364 INFO L933 BasicCegarLoop]: 548 mSDtfsCounter, 711 mSDsluCounter, 2053 mSDsCounter, 0 mSdLazyCounter, 256 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 711 SdHoareTripleChecker+Valid, 2465 SdHoareTripleChecker+Invalid, 272 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 256 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:23:29,364 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [711 Valid, 2465 Invalid, 272 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 256 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 00:23:29,367 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1902 states. [2021-11-21 00:23:29,425 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1902 to 1605. [2021-11-21 00:23:29,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1605 states, 1604 states have (on average 1.5679551122194513) internal successors, (2515), 1604 states have internal predecessors, (2515), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:29,443 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1605 states to 1605 states and 2515 transitions. [2021-11-21 00:23:29,443 INFO L78 Accepts]: Start accepts. Automaton has 1605 states and 2515 transitions. Word has length 108 [2021-11-21 00:23:29,444 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:23:29,444 INFO L470 AbstractCegarLoop]: Abstraction has 1605 states and 2515 transitions. [2021-11-21 00:23:29,444 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 24.0) internal successors, (192), 7 states have internal predecessors, (192), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:29,445 INFO L276 IsEmpty]: Start isEmpty. Operand 1605 states and 2515 transitions. [2021-11-21 00:23:29,450 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 178 [2021-11-21 00:23:29,450 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:23:29,451 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 7, 7, 7, 7, 6, 6, 5, 5, 5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:23:29,496 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca271e0f-f703-412d-9887-7b6a67ee5ecb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-21 00:23:29,666 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca271e0f-f703-412d-9887-7b6a67ee5ecb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-21 00:23:29,667 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:23:29,667 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:23:29,667 INFO L85 PathProgramCache]: Analyzing trace with hash -1861212809, now seen corresponding path program 2 times [2021-11-21 00:23:29,668 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:23:29,668 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [753847847] [2021-11-21 00:23:29,668 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:23:29,668 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:23:29,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:23:29,778 INFO L134 CoverageAnalysis]: Checked inductivity of 335 backedges. 236 proven. 0 refuted. 0 times theorem prover too weak. 99 trivial. 0 not checked. [2021-11-21 00:23:29,778 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:23:29,778 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [753847847] [2021-11-21 00:23:29,779 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [753847847] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:23:29,779 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:23:29,779 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 00:23:29,779 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1557154295] [2021-11-21 00:23:29,779 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:23:29,780 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:23:29,780 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:23:29,781 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:23:29,781 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:23:29,781 INFO L87 Difference]: Start difference. First operand 1605 states and 2515 transitions. Second operand has 3 states, 3 states have (on average 35.666666666666664) internal successors, (107), 3 states have internal predecessors, (107), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:30,033 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:23:30,033 INFO L93 Difference]: Finished difference Result 3248 states and 5073 transitions. [2021-11-21 00:23:30,034 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:23:30,034 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 35.666666666666664) internal successors, (107), 3 states have internal predecessors, (107), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 177 [2021-11-21 00:23:30,035 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:23:30,046 INFO L225 Difference]: With dead ends: 3248 [2021-11-21 00:23:30,046 INFO L226 Difference]: Without dead ends: 1645 [2021-11-21 00:23:30,049 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:23:30,050 INFO L933 BasicCegarLoop]: 144 mSDtfsCounter, 43 mSDsluCounter, 59 mSDsCounter, 0 mSdLazyCounter, 144 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 197 SdHoareTripleChecker+Invalid, 167 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 144 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:23:30,051 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [43 Valid, 197 Invalid, 167 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 144 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 00:23:30,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1645 states. [2021-11-21 00:23:30,121 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1645 to 1605. [2021-11-21 00:23:30,125 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1605 states, 1604 states have (on average 1.523067331670823) internal successors, (2443), 1604 states have internal predecessors, (2443), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:30,134 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1605 states to 1605 states and 2443 transitions. [2021-11-21 00:23:30,134 INFO L78 Accepts]: Start accepts. Automaton has 1605 states and 2443 transitions. Word has length 177 [2021-11-21 00:23:30,135 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:23:30,135 INFO L470 AbstractCegarLoop]: Abstraction has 1605 states and 2443 transitions. [2021-11-21 00:23:30,135 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 35.666666666666664) internal successors, (107), 3 states have internal predecessors, (107), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:30,136 INFO L276 IsEmpty]: Start isEmpty. Operand 1605 states and 2443 transitions. [2021-11-21 00:23:30,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 189 [2021-11-21 00:23:30,141 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:23:30,142 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 5, 5, 5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:23:30,142 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-11-21 00:23:30,142 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:23:30,143 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:23:30,143 INFO L85 PathProgramCache]: Analyzing trace with hash 1104668925, now seen corresponding path program 1 times [2021-11-21 00:23:30,143 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:23:30,143 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1994878653] [2021-11-21 00:23:30,144 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:23:30,144 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:23:30,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:23:30,202 INFO L134 CoverageAnalysis]: Checked inductivity of 368 backedges. 233 proven. 0 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2021-11-21 00:23:30,203 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:23:30,203 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1994878653] [2021-11-21 00:23:30,203 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1994878653] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:23:30,203 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:23:30,204 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 00:23:30,204 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [405592771] [2021-11-21 00:23:30,204 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:23:30,205 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:23:30,205 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:23:30,205 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:23:30,206 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:23:30,206 INFO L87 Difference]: Start difference. First operand 1605 states and 2443 transitions. Second operand has 3 states, 3 states have (on average 35.666666666666664) internal successors, (107), 3 states have internal predecessors, (107), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:30,449 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:23:30,449 INFO L93 Difference]: Finished difference Result 2966 states and 4480 transitions. [2021-11-21 00:23:30,450 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:23:30,450 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 35.666666666666664) internal successors, (107), 3 states have internal predecessors, (107), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 188 [2021-11-21 00:23:30,451 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:23:30,460 INFO L225 Difference]: With dead ends: 2966 [2021-11-21 00:23:30,460 INFO L226 Difference]: Without dead ends: 1363 [2021-11-21 00:23:30,463 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:23:30,464 INFO L933 BasicCegarLoop]: 85 mSDtfsCounter, 116 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 113 mSolverCounterSat, 54 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 116 SdHoareTripleChecker+Valid, 101 SdHoareTripleChecker+Invalid, 167 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 54 IncrementalHoareTripleChecker+Valid, 113 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:23:30,465 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [116 Valid, 101 Invalid, 167 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [54 Valid, 113 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 00:23:30,467 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1363 states. [2021-11-21 00:23:30,540 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1363 to 1319. [2021-11-21 00:23:30,543 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1319 states, 1318 states have (on average 1.4635811836115327) internal successors, (1929), 1318 states have internal predecessors, (1929), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:30,550 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1319 states to 1319 states and 1929 transitions. [2021-11-21 00:23:30,550 INFO L78 Accepts]: Start accepts. Automaton has 1319 states and 1929 transitions. Word has length 188 [2021-11-21 00:23:30,551 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:23:30,551 INFO L470 AbstractCegarLoop]: Abstraction has 1319 states and 1929 transitions. [2021-11-21 00:23:30,551 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 35.666666666666664) internal successors, (107), 3 states have internal predecessors, (107), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:30,551 INFO L276 IsEmpty]: Start isEmpty. Operand 1319 states and 1929 transitions. [2021-11-21 00:23:30,557 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 213 [2021-11-21 00:23:30,558 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:23:30,558 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:23:30,558 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2021-11-21 00:23:30,559 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:23:30,559 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:23:30,559 INFO L85 PathProgramCache]: Analyzing trace with hash 1892649862, now seen corresponding path program 1 times [2021-11-21 00:23:30,559 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:23:30,560 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [57616219] [2021-11-21 00:23:30,560 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:23:30,560 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:23:30,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:23:30,664 INFO L134 CoverageAnalysis]: Checked inductivity of 447 backedges. 277 proven. 143 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-11-21 00:23:30,664 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:23:30,665 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [57616219] [2021-11-21 00:23:30,665 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [57616219] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:23:30,665 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [276792419] [2021-11-21 00:23:30,665 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:23:30,665 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:23:30,666 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca271e0f-f703-412d-9887-7b6a67ee5ecb/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:23:30,670 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca271e0f-f703-412d-9887-7b6a67ee5ecb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:23:30,687 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca271e0f-f703-412d-9887-7b6a67ee5ecb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-21 00:23:30,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:23:30,794 INFO L263 TraceCheckSpWp]: Trace formula consists of 387 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-21 00:23:30,802 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:23:31,494 INFO L134 CoverageAnalysis]: Checked inductivity of 447 backedges. 260 proven. 160 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-11-21 00:23:31,494 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:23:31,924 INFO L134 CoverageAnalysis]: Checked inductivity of 447 backedges. 328 proven. 25 refuted. 0 times theorem prover too weak. 94 trivial. 0 not checked. [2021-11-21 00:23:31,924 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [276792419] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:23:31,924 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [270578052] [2021-11-21 00:23:31,929 INFO L159 IcfgInterpreter]: Started Sifa with 53 locations of interest [2021-11-21 00:23:31,929 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:23:31,929 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:23:31,930 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:23:31,930 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:26:29,969 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:26:57,397 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:26:57,397 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:26:57,398 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 4] total 11 [2021-11-21 00:26:57,398 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1261229818] [2021-11-21 00:26:57,398 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:26:57,399 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-21 00:26:57,399 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:26:57,400 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-21 00:26:57,401 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=635, Invalid=2671, Unknown=0, NotChecked=0, Total=3306 [2021-11-21 00:26:57,402 INFO L87 Difference]: Start difference. First operand 1319 states and 1929 transitions. Second operand has 11 states, 11 states have (on average 32.63636363636363) internal successors, (359), 11 states have internal predecessors, (359), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:27:00,003 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:27:00,004 INFO L93 Difference]: Finished difference Result 5815 states and 8511 transitions. [2021-11-21 00:27:00,004 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-21 00:27:00,005 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 32.63636363636363) internal successors, (359), 11 states have internal predecessors, (359), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 212 [2021-11-21 00:27:00,005 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:27:00,035 INFO L225 Difference]: With dead ends: 5815 [2021-11-21 00:27:00,035 INFO L226 Difference]: Without dead ends: 4438 [2021-11-21 00:27:00,042 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 671 GetRequests, 569 SyntacticMatches, 28 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3003 ImplicationChecksByTransitivity, 28.0s TimeCoverageRelationStatistics Valid=817, Invalid=4883, Unknown=0, NotChecked=0, Total=5700 [2021-11-21 00:27:00,043 INFO L933 BasicCegarLoop]: 276 mSDtfsCounter, 694 mSDsluCounter, 1258 mSDsCounter, 0 mSdLazyCounter, 2631 mSolverCounterSat, 130 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 694 SdHoareTripleChecker+Valid, 1440 SdHoareTripleChecker+Invalid, 2761 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 130 IncrementalHoareTripleChecker+Valid, 2631 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2021-11-21 00:27:00,043 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [694 Valid, 1440 Invalid, 2761 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [130 Valid, 2631 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2021-11-21 00:27:00,050 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4438 states. [2021-11-21 00:27:00,215 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4438 to 2430. [2021-11-21 00:27:00,221 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2430 states, 2429 states have (on average 1.3738163853437628) internal successors, (3337), 2429 states have internal predecessors, (3337), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:27:00,229 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2430 states to 2430 states and 3337 transitions. [2021-11-21 00:27:00,230 INFO L78 Accepts]: Start accepts. Automaton has 2430 states and 3337 transitions. Word has length 212 [2021-11-21 00:27:00,230 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:27:00,230 INFO L470 AbstractCegarLoop]: Abstraction has 2430 states and 3337 transitions. [2021-11-21 00:27:00,231 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 32.63636363636363) internal successors, (359), 11 states have internal predecessors, (359), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:27:00,231 INFO L276 IsEmpty]: Start isEmpty. Operand 2430 states and 3337 transitions. [2021-11-21 00:27:00,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 217 [2021-11-21 00:27:00,239 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:27:00,240 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 7, 7, 6, 6, 6, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2021-11-21 00:27:00,283 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca271e0f-f703-412d-9887-7b6a67ee5ecb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-21 00:27:00,466 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca271e0f-f703-412d-9887-7b6a67ee5ecb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-21 00:27:00,467 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:27:00,467 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:27:00,467 INFO L85 PathProgramCache]: Analyzing trace with hash -1374289960, now seen corresponding path program 1 times [2021-11-21 00:27:00,467 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:27:00,467 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1058698056] [2021-11-21 00:27:00,468 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:27:00,468 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:27:00,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:27:00,536 INFO L134 CoverageAnalysis]: Checked inductivity of 493 backedges. 335 proven. 0 refuted. 0 times theorem prover too weak. 158 trivial. 0 not checked. [2021-11-21 00:27:00,536 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:27:00,536 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1058698056] [2021-11-21 00:27:00,537 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1058698056] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:27:00,537 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:27:00,537 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 00:27:00,537 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [224931120] [2021-11-21 00:27:00,537 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:27:00,539 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:27:00,539 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:27:00,539 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:27:00,540 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:27:00,540 INFO L87 Difference]: Start difference. First operand 2430 states and 3337 transitions. Second operand has 3 states, 3 states have (on average 37.666666666666664) internal successors, (113), 3 states have internal predecessors, (113), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:27:00,805 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:27:00,805 INFO L93 Difference]: Finished difference Result 5117 states and 7071 transitions. [2021-11-21 00:27:00,806 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:27:00,806 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 37.666666666666664) internal successors, (113), 3 states have internal predecessors, (113), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 216 [2021-11-21 00:27:00,806 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:27:00,823 INFO L225 Difference]: With dead ends: 5117 [2021-11-21 00:27:00,824 INFO L226 Difference]: Without dead ends: 2521 [2021-11-21 00:27:00,828 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:27:00,829 INFO L933 BasicCegarLoop]: 133 mSDtfsCounter, 38 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 126 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 182 SdHoareTripleChecker+Invalid, 148 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 126 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:27:00,830 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 182 Invalid, 148 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 126 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 00:27:00,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2521 states. [2021-11-21 00:27:00,960 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2521 to 2521. [2021-11-21 00:27:00,966 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2521 states, 2520 states have (on average 1.342063492063492) internal successors, (3382), 2520 states have internal predecessors, (3382), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:27:00,974 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2521 states to 2521 states and 3382 transitions. [2021-11-21 00:27:00,975 INFO L78 Accepts]: Start accepts. Automaton has 2521 states and 3382 transitions. Word has length 216 [2021-11-21 00:27:00,975 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:27:00,975 INFO L470 AbstractCegarLoop]: Abstraction has 2521 states and 3382 transitions. [2021-11-21 00:27:00,976 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 37.666666666666664) internal successors, (113), 3 states have internal predecessors, (113), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:27:00,976 INFO L276 IsEmpty]: Start isEmpty. Operand 2521 states and 3382 transitions. [2021-11-21 00:27:00,984 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 229 [2021-11-21 00:27:00,985 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:27:00,985 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 8, 8, 8, 8, 8, 8, 8, 8, 6, 6, 6, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 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] [2021-11-21 00:27:00,985 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2021-11-21 00:27:00,986 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:27:00,986 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:27:00,986 INFO L85 PathProgramCache]: Analyzing trace with hash -232923619, now seen corresponding path program 1 times [2021-11-21 00:27:00,986 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:27:00,987 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1603150632] [2021-11-21 00:27:00,987 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:27:00,987 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:27:01,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:27:01,048 INFO L134 CoverageAnalysis]: Checked inductivity of 539 backedges. 345 proven. 0 refuted. 0 times theorem prover too weak. 194 trivial. 0 not checked. [2021-11-21 00:27:01,048 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:27:01,049 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1603150632] [2021-11-21 00:27:01,049 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1603150632] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:27:01,049 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:27:01,049 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 00:27:01,049 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1007684994] [2021-11-21 00:27:01,050 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:27:01,051 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:27:01,051 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:27:01,051 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:27:01,052 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:27:01,052 INFO L87 Difference]: Start difference. First operand 2521 states and 3382 transitions. Second operand has 3 states, 3 states have (on average 38.0) internal successors, (114), 3 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:27:01,373 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:27:01,373 INFO L93 Difference]: Finished difference Result 5246 states and 7055 transitions. [2021-11-21 00:27:01,373 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:27:01,374 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 38.0) internal successors, (114), 3 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 228 [2021-11-21 00:27:01,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:27:01,392 INFO L225 Difference]: With dead ends: 5246 [2021-11-21 00:27:01,392 INFO L226 Difference]: Without dead ends: 2727 [2021-11-21 00:27:01,396 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:27:01,397 INFO L933 BasicCegarLoop]: 91 mSDtfsCounter, 105 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 105 mSolverCounterSat, 44 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 105 SdHoareTripleChecker+Valid, 105 SdHoareTripleChecker+Invalid, 149 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 44 IncrementalHoareTripleChecker+Valid, 105 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:27:01,398 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [105 Valid, 105 Invalid, 149 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [44 Valid, 105 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 00:27:01,407 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2727 states. [2021-11-21 00:27:01,536 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2727 to 2557. [2021-11-21 00:27:01,543 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2557 states, 2556 states have (on average 1.3157276995305165) internal successors, (3363), 2556 states have internal predecessors, (3363), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:27:01,551 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2557 states to 2557 states and 3363 transitions. [2021-11-21 00:27:01,551 INFO L78 Accepts]: Start accepts. Automaton has 2557 states and 3363 transitions. Word has length 228 [2021-11-21 00:27:01,551 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:27:01,552 INFO L470 AbstractCegarLoop]: Abstraction has 2557 states and 3363 transitions. [2021-11-21 00:27:01,552 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 38.0) internal successors, (114), 3 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:27:01,552 INFO L276 IsEmpty]: Start isEmpty. Operand 2557 states and 3363 transitions. [2021-11-21 00:27:01,562 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 278 [2021-11-21 00:27:01,562 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:27:01,563 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 10, 10, 10, 10, 9, 9, 8, 8, 8, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 4, 4, 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] [2021-11-21 00:27:01,563 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2021-11-21 00:27:01,563 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:27:01,564 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:27:01,564 INFO L85 PathProgramCache]: Analyzing trace with hash 671381906, now seen corresponding path program 1 times [2021-11-21 00:27:01,564 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:27:01,564 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [818540307] [2021-11-21 00:27:01,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:27:01,565 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:27:01,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:27:01,663 INFO L134 CoverageAnalysis]: Checked inductivity of 850 backedges. 606 proven. 48 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2021-11-21 00:27:01,663 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:27:01,663 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [818540307] [2021-11-21 00:27:01,664 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [818540307] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:27:01,664 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1647029142] [2021-11-21 00:27:01,664 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:27:01,664 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:27:01,664 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca271e0f-f703-412d-9887-7b6a67ee5ecb/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:27:01,665 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca271e0f-f703-412d-9887-7b6a67ee5ecb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:27:01,690 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca271e0f-f703-412d-9887-7b6a67ee5ecb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-21 00:27:01,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:27:01,803 INFO L263 TraceCheckSpWp]: Trace formula consists of 486 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-21 00:27:01,824 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:27:02,606 INFO L134 CoverageAnalysis]: Checked inductivity of 850 backedges. 555 proven. 99 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2021-11-21 00:27:02,606 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:27:03,289 INFO L134 CoverageAnalysis]: Checked inductivity of 850 backedges. 606 proven. 48 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2021-11-21 00:27:03,289 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1647029142] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:27:03,289 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1309739214] [2021-11-21 00:27:03,293 INFO L159 IcfgInterpreter]: Started Sifa with 55 locations of interest [2021-11-21 00:27:03,293 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:27:03,294 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:27:03,294 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:27:03,295 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:29:57,501 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:30:20,263 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:30:20,263 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:30:20,264 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2021-11-21 00:30:20,264 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1424148982] [2021-11-21 00:30:20,264 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:30:20,265 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-21 00:30:20,265 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:30:20,265 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-21 00:30:20,267 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=636, Invalid=2670, Unknown=0, NotChecked=0, Total=3306 [2021-11-21 00:30:20,267 INFO L87 Difference]: Start difference. First operand 2557 states and 3363 transitions. Second operand has 8 states, 8 states have (on average 24.25) internal successors, (194), 8 states have internal predecessors, (194), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:30:20,856 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:30:20,856 INFO L93 Difference]: Finished difference Result 4423 states and 5781 transitions. [2021-11-21 00:30:20,856 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-21 00:30:20,857 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 24.25) internal successors, (194), 8 states have internal predecessors, (194), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 277 [2021-11-21 00:30:20,857 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:30:20,864 INFO L225 Difference]: With dead ends: 4423 [2021-11-21 00:30:20,864 INFO L226 Difference]: Without dead ends: 1480 [2021-11-21 00:30:20,869 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 839 GetRequests, 760 SyntacticMatches, 20 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1855 ImplicationChecksByTransitivity, 22.9s TimeCoverageRelationStatistics Valid=654, Invalid=3006, Unknown=0, NotChecked=0, Total=3660 [2021-11-21 00:30:20,869 INFO L933 BasicCegarLoop]: 187 mSDtfsCounter, 183 mSDsluCounter, 277 mSDsCounter, 0 mSdLazyCounter, 643 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 183 SdHoareTripleChecker+Valid, 446 SdHoareTripleChecker+Invalid, 678 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 643 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 00:30:20,870 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [183 Valid, 446 Invalid, 678 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 643 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 00:30:20,872 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1480 states. [2021-11-21 00:30:20,926 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1480 to 1450. [2021-11-21 00:30:20,930 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1450 states, 1449 states have (on average 1.308488612836439) internal successors, (1896), 1449 states have internal predecessors, (1896), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:30:20,933 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1450 states to 1450 states and 1896 transitions. [2021-11-21 00:30:20,934 INFO L78 Accepts]: Start accepts. Automaton has 1450 states and 1896 transitions. Word has length 277 [2021-11-21 00:30:20,934 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:30:20,934 INFO L470 AbstractCegarLoop]: Abstraction has 1450 states and 1896 transitions. [2021-11-21 00:30:20,935 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 24.25) internal successors, (194), 8 states have internal predecessors, (194), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:30:20,935 INFO L276 IsEmpty]: Start isEmpty. Operand 1450 states and 1896 transitions. [2021-11-21 00:30:20,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 284 [2021-11-21 00:30:20,941 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:30:20,942 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 10, 10, 10, 10, 9, 9, 9, 9, 9, 7, 7, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 4, 4, 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] [2021-11-21 00:30:20,980 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca271e0f-f703-412d-9887-7b6a67ee5ecb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-21 00:30:21,158 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca271e0f-f703-412d-9887-7b6a67ee5ecb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:30:21,158 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:30:21,158 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:30:21,158 INFO L85 PathProgramCache]: Analyzing trace with hash 1663820958, now seen corresponding path program 1 times [2021-11-21 00:30:21,159 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:30:21,159 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1529212155] [2021-11-21 00:30:21,159 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:30:21,159 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:30:21,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:30:21,206 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 404 proven. 0 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2021-11-21 00:30:21,207 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:30:21,207 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1529212155] [2021-11-21 00:30:21,207 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1529212155] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:30:21,207 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:30:21,207 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 00:30:21,208 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1325138690] [2021-11-21 00:30:21,208 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:30:21,208 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:30:21,208 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:30:21,209 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:30:21,211 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:30:21,211 INFO L87 Difference]: Start difference. First operand 1450 states and 1896 transitions. Second operand has 3 states, 3 states have (on average 34.0) internal successors, (102), 3 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:30:21,371 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:30:21,372 INFO L93 Difference]: Finished difference Result 3030 states and 3982 transitions. [2021-11-21 00:30:21,372 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:30:21,373 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 34.0) internal successors, (102), 3 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 283 [2021-11-21 00:30:21,373 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:30:21,381 INFO L225 Difference]: With dead ends: 3030 [2021-11-21 00:30:21,381 INFO L226 Difference]: Without dead ends: 1582 [2021-11-21 00:30:21,385 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:30:21,387 INFO L933 BasicCegarLoop]: 143 mSDtfsCounter, 21 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 117 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 201 SdHoareTripleChecker+Invalid, 124 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 117 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:30:21,387 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 201 Invalid, 124 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 117 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:30:21,389 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1582 states. [2021-11-21 00:30:21,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1582 to 1542. [2021-11-21 00:30:21,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1542 states, 1541 states have (on average 1.2978585334198571) internal successors, (2000), 1541 states have internal predecessors, (2000), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:30:21,478 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1542 states to 1542 states and 2000 transitions. [2021-11-21 00:30:21,479 INFO L78 Accepts]: Start accepts. Automaton has 1542 states and 2000 transitions. Word has length 283 [2021-11-21 00:30:21,479 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:30:21,479 INFO L470 AbstractCegarLoop]: Abstraction has 1542 states and 2000 transitions. [2021-11-21 00:30:21,479 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 34.0) internal successors, (102), 3 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:30:21,479 INFO L276 IsEmpty]: Start isEmpty. Operand 1542 states and 2000 transitions. [2021-11-21 00:30:21,484 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 308 [2021-11-21 00:30:21,484 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:30:21,484 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 11, 11, 11, 11, 11, 10, 10, 10, 10, 10, 8, 8, 7, 7, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 4, 4, 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] [2021-11-21 00:30:21,485 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2021-11-21 00:30:21,485 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:30:21,485 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:30:21,485 INFO L85 PathProgramCache]: Analyzing trace with hash -1950259234, now seen corresponding path program 1 times [2021-11-21 00:30:21,486 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:30:21,486 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [133874508] [2021-11-21 00:30:21,486 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:30:21,486 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:30:21,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:30:21,534 INFO L134 CoverageAnalysis]: Checked inductivity of 1055 backedges. 543 proven. 0 refuted. 0 times theorem prover too weak. 512 trivial. 0 not checked. [2021-11-21 00:30:21,534 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:30:21,534 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [133874508] [2021-11-21 00:30:21,535 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [133874508] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:30:21,535 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:30:21,535 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 00:30:21,535 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [537553668] [2021-11-21 00:30:21,535 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:30:21,536 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:30:21,536 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:30:21,537 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:30:21,537 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:30:21,537 INFO L87 Difference]: Start difference. First operand 1542 states and 2000 transitions. Second operand has 3 states, 3 states have (on average 37.333333333333336) internal successors, (112), 3 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:30:21,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:30:21,693 INFO L93 Difference]: Finished difference Result 3114 states and 4050 transitions. [2021-11-21 00:30:21,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:30:21,694 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 37.333333333333336) internal successors, (112), 3 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 307 [2021-11-21 00:30:21,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:30:21,701 INFO L225 Difference]: With dead ends: 3114 [2021-11-21 00:30:21,701 INFO L226 Difference]: Without dead ends: 1574 [2021-11-21 00:30:21,703 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:30:21,704 INFO L933 BasicCegarLoop]: 142 mSDtfsCounter, 16 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 119 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 200 SdHoareTripleChecker+Invalid, 128 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 119 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:30:21,704 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 200 Invalid, 128 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 119 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:30:21,706 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1574 states. [2021-11-21 00:30:21,763 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1574 to 1542. [2021-11-21 00:30:21,766 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1542 states, 1541 states have (on average 1.2770927968851395) internal successors, (1968), 1541 states have internal predecessors, (1968), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:30:21,773 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1542 states to 1542 states and 1968 transitions. [2021-11-21 00:30:21,774 INFO L78 Accepts]: Start accepts. Automaton has 1542 states and 1968 transitions. Word has length 307 [2021-11-21 00:30:21,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:30:21,774 INFO L470 AbstractCegarLoop]: Abstraction has 1542 states and 1968 transitions. [2021-11-21 00:30:21,774 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 37.333333333333336) internal successors, (112), 3 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:30:21,775 INFO L276 IsEmpty]: Start isEmpty. Operand 1542 states and 1968 transitions. [2021-11-21 00:30:21,779 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 330 [2021-11-21 00:30:21,779 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:30:21,779 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 12, 12, 12, 12, 12, 11, 11, 11, 11, 11, 9, 9, 8, 8, 7, 7, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 4, 4, 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] [2021-11-21 00:30:21,780 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2021-11-21 00:30:21,780 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:30:21,780 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:30:21,780 INFO L85 PathProgramCache]: Analyzing trace with hash -859082059, now seen corresponding path program 1 times [2021-11-21 00:30:21,781 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:30:21,781 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1208889347] [2021-11-21 00:30:21,781 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:30:21,781 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:30:21,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:30:21,836 INFO L134 CoverageAnalysis]: Checked inductivity of 1257 backedges. 694 proven. 0 refuted. 0 times theorem prover too weak. 563 trivial. 0 not checked. [2021-11-21 00:30:21,836 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:30:21,836 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1208889347] [2021-11-21 00:30:21,836 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1208889347] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:30:21,837 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:30:21,837 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 00:30:21,837 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2087965266] [2021-11-21 00:30:21,837 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:30:21,838 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:30:21,838 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:30:21,838 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:30:21,838 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:30:21,839 INFO L87 Difference]: Start difference. First operand 1542 states and 1968 transitions. Second operand has 3 states, 3 states have (on average 39.333333333333336) internal successors, (118), 3 states have internal predecessors, (118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:30:21,996 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:30:21,996 INFO L93 Difference]: Finished difference Result 3090 states and 3942 transitions. [2021-11-21 00:30:21,997 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:30:21,997 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 39.333333333333336) internal successors, (118), 3 states have internal predecessors, (118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 329 [2021-11-21 00:30:21,997 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:30:22,005 INFO L225 Difference]: With dead ends: 3090 [2021-11-21 00:30:22,005 INFO L226 Difference]: Without dead ends: 1550 [2021-11-21 00:30:22,008 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:30:22,009 INFO L933 BasicCegarLoop]: 142 mSDtfsCounter, 8 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 119 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 200 SdHoareTripleChecker+Invalid, 130 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 119 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:30:22,013 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 200 Invalid, 130 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 119 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:30:22,015 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1550 states. [2021-11-21 00:30:22,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1550 to 1542. [2021-11-21 00:30:22,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1542 states, 1541 states have (on average 1.2563270603504217) internal successors, (1936), 1541 states have internal predecessors, (1936), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:30:22,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1542 states to 1542 states and 1936 transitions. [2021-11-21 00:30:22,079 INFO L78 Accepts]: Start accepts. Automaton has 1542 states and 1936 transitions. Word has length 329 [2021-11-21 00:30:22,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:30:22,079 INFO L470 AbstractCegarLoop]: Abstraction has 1542 states and 1936 transitions. [2021-11-21 00:30:22,080 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 39.333333333333336) internal successors, (118), 3 states have internal predecessors, (118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:30:22,080 INFO L276 IsEmpty]: Start isEmpty. Operand 1542 states and 1936 transitions. [2021-11-21 00:30:22,084 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 362 [2021-11-21 00:30:22,084 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:30:22,084 INFO L514 BasicCegarLoop]: trace histogram [13, 13, 13, 13, 13, 13, 13, 13, 13, 12, 12, 12, 12, 12, 10, 10, 9, 9, 8, 8, 7, 7, 7, 7, 5, 5, 5, 5, 5, 5, 5, 4, 4, 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] [2021-11-21 00:30:22,084 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2021-11-21 00:30:22,085 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:30:22,085 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:30:22,086 INFO L85 PathProgramCache]: Analyzing trace with hash 1909439056, now seen corresponding path program 1 times [2021-11-21 00:30:22,086 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:30:22,086 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [220963529] [2021-11-21 00:30:22,087 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:30:22,087 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:30:22,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:30:22,163 INFO L134 CoverageAnalysis]: Checked inductivity of 1506 backedges. 956 proven. 25 refuted. 0 times theorem prover too weak. 525 trivial. 0 not checked. [2021-11-21 00:30:22,163 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:30:22,163 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [220963529] [2021-11-21 00:30:22,163 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [220963529] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:30:22,164 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [302442439] [2021-11-21 00:30:22,164 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:30:22,164 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:30:22,164 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca271e0f-f703-412d-9887-7b6a67ee5ecb/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:30:22,167 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca271e0f-f703-412d-9887-7b6a67ee5ecb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:30:22,189 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca271e0f-f703-412d-9887-7b6a67ee5ecb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-21 00:30:22,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:30:22,293 INFO L263 TraceCheckSpWp]: Trace formula consists of 598 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-21 00:30:22,297 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:30:23,120 INFO L134 CoverageAnalysis]: Checked inductivity of 1506 backedges. 595 proven. 285 refuted. 0 times theorem prover too weak. 626 trivial. 0 not checked. [2021-11-21 00:30:23,121 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:30:23,808 INFO L134 CoverageAnalysis]: Checked inductivity of 1506 backedges. 729 proven. 151 refuted. 0 times theorem prover too weak. 626 trivial. 0 not checked. [2021-11-21 00:30:23,808 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [302442439] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:30:23,808 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2112417162] [2021-11-21 00:30:23,812 INFO L159 IcfgInterpreter]: Started Sifa with 69 locations of interest [2021-11-21 00:30:23,812 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:30:23,813 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:30:23,813 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:30:23,813 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs