./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/array-memsafety/openbsd_cstrpbrk-alloca-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 839c364b Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/openbsd_cstrpbrk-alloca-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7 --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash d450427152972d80716d02c80706dd3b248a3fc7c05c71ffd29d66e32e1e82f2 --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 17:55:11,052 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 17:55:11,054 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 17:55:11,089 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 17:55:11,090 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 17:55:11,091 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 17:55:11,093 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 17:55:11,095 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 17:55:11,097 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 17:55:11,099 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 17:55:11,100 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 17:55:11,101 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 17:55:11,102 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 17:55:11,103 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 17:55:11,104 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 17:55:11,106 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 17:55:11,107 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 17:55:11,108 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 17:55:11,110 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 17:55:11,113 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 17:55:11,115 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 17:55:11,116 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 17:55:11,118 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 17:55:11,119 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 17:55:11,123 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 17:55:11,123 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 17:55:11,124 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 17:55:11,125 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 17:55:11,125 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 17:55:11,126 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 17:55:11,127 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 17:55:11,128 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 17:55:11,129 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 17:55:11,129 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 17:55:11,130 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 17:55:11,131 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 17:55:11,131 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 17:55:11,132 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 17:55:11,132 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 17:55:11,133 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 17:55:11,134 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 17:55:11,135 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2021-11-25 17:55:11,160 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 17:55:11,161 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 17:55:11,161 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 17:55:11,161 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 17:55:11,162 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 17:55:11,162 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 17:55:11,162 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 17:55:11,163 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 17:55:11,163 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 17:55:11,163 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 17:55:11,163 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 17:55:11,164 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 17:55:11,164 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 17:55:11,164 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 17:55:11,164 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 17:55:11,164 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 17:55:11,165 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 17:55:11,165 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 17:55:11,166 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-25 17:55:11,166 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-25 17:55:11,166 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 17:55:11,166 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 17:55:11,167 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-11-25 17:55:11,167 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 17:55:11,167 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 17:55:11,167 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 17:55:11,167 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-11-25 17:55:11,168 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-11-25 17:55:11,168 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-11-25 17:55:11,168 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 17:55:11,168 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-25 17:55:11,169 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 17:55:11,169 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 17:55:11,169 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 17:55:11,169 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 17:55:11,169 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 17:55:11,170 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 17:55:11,170 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 17:55:11,170 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 17:55:11,170 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 17:55:11,171 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 17:55:11,171 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 17:55:11,171 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_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> d450427152972d80716d02c80706dd3b248a3fc7c05c71ffd29d66e32e1e82f2 [2021-11-25 17:55:11,424 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 17:55:11,448 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 17:55:11,453 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 17:55:11,454 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 17:55:11,455 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 17:55:11,456 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/array-memsafety/openbsd_cstrpbrk-alloca-2.i [2021-11-25 17:55:11,533 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/data/df9220878/23b04780b8fb45eeb992a2a2b0adbaa8/FLAG0efc11040 [2021-11-25 17:55:12,080 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 17:55:12,081 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/sv-benchmarks/c/array-memsafety/openbsd_cstrpbrk-alloca-2.i [2021-11-25 17:55:12,099 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/data/df9220878/23b04780b8fb45eeb992a2a2b0adbaa8/FLAG0efc11040 [2021-11-25 17:55:12,413 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/data/df9220878/23b04780b8fb45eeb992a2a2b0adbaa8 [2021-11-25 17:55:12,415 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 17:55:12,416 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 17:55:12,418 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 17:55:12,418 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 17:55:12,421 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 17:55:12,422 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 05:55:12" (1/1) ... [2021-11-25 17:55:12,423 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@672dab49 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:55:12, skipping insertion in model container [2021-11-25 17:55:12,423 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 05:55:12" (1/1) ... [2021-11-25 17:55:12,430 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 17:55:12,469 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 17:55:12,865 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 17:55:12,874 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 17:55:12,917 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 17:55:12,952 INFO L208 MainTranslator]: Completed translation [2021-11-25 17:55:12,952 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:55:12 WrapperNode [2021-11-25 17:55:12,952 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 17:55:12,953 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 17:55:12,953 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 17:55:12,953 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 17:55:12,960 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:55:12" (1/1) ... [2021-11-25 17:55:12,979 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:55:12" (1/1) ... [2021-11-25 17:55:13,009 INFO L137 Inliner]: procedures = 117, calls = 15, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 90 [2021-11-25 17:55:13,009 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 17:55:13,010 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 17:55:13,010 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 17:55:13,010 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 17:55:13,018 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:55:12" (1/1) ... [2021-11-25 17:55:13,018 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:55:12" (1/1) ... [2021-11-25 17:55:13,022 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:55:12" (1/1) ... [2021-11-25 17:55:13,022 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:55:12" (1/1) ... [2021-11-25 17:55:13,029 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:55:12" (1/1) ... [2021-11-25 17:55:13,033 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:55:12" (1/1) ... [2021-11-25 17:55:13,035 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:55:12" (1/1) ... [2021-11-25 17:55:13,038 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 17:55:13,039 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 17:55:13,039 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 17:55:13,039 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 17:55:13,040 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:55:12" (1/1) ... [2021-11-25 17:55:13,055 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 17:55:13,064 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:55:13,074 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 17:55:13,077 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 17:55:13,110 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-25 17:55:13,110 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-25 17:55:13,110 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-25 17:55:13,110 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-25 17:55:13,111 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 17:55:13,111 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 17:55:13,193 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 17:55:13,195 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 17:55:13,420 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 17:55:13,526 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 17:55:13,526 INFO L301 CfgBuilder]: Removed 4 assume(true) statements. [2021-11-25 17:55:13,529 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 05:55:13 BoogieIcfgContainer [2021-11-25 17:55:13,529 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 17:55:13,531 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 17:55:13,531 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 17:55:13,534 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 17:55:13,534 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 05:55:12" (1/3) ... [2021-11-25 17:55:13,535 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@42610c26 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 05:55:13, skipping insertion in model container [2021-11-25 17:55:13,535 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:55:12" (2/3) ... [2021-11-25 17:55:13,535 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@42610c26 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 05:55:13, skipping insertion in model container [2021-11-25 17:55:13,535 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 05:55:13" (3/3) ... [2021-11-25 17:55:13,536 INFO L111 eAbstractionObserver]: Analyzing ICFG openbsd_cstrpbrk-alloca-2.i [2021-11-25 17:55:13,540 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 17:55:13,540 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 13 error locations. [2021-11-25 17:55:13,594 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 17:55:13,600 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=false, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-25 17:55:13,600 INFO L340 AbstractCegarLoop]: Starting to check reachability of 13 error locations. [2021-11-25 17:55:13,614 INFO L276 IsEmpty]: Start isEmpty. Operand has 31 states, 17 states have (on average 2.176470588235294) internal successors, (37), 30 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:55:13,620 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2021-11-25 17:55:13,620 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:55:13,621 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1] [2021-11-25 17:55:13,621 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-25 17:55:13,627 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:55:13,627 INFO L85 PathProgramCache]: Analyzing trace with hash 145849, now seen corresponding path program 1 times [2021-11-25 17:55:13,636 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:55:13,637 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [739283220] [2021-11-25 17:55:13,637 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:55:13,638 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:55:13,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:55:13,826 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 17:55:13,827 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:55:13,827 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [739283220] [2021-11-25 17:55:13,828 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [739283220] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:55:13,828 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 17:55:13,829 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-11-25 17:55:13,830 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [571478528] [2021-11-25 17:55:13,831 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:55:13,835 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 17:55:13,835 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:55:13,870 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 17:55:13,872 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 17:55:13,875 INFO L87 Difference]: Start difference. First operand has 31 states, 17 states have (on average 2.176470588235294) internal successors, (37), 30 states have internal predecessors, (37), 0 states have call successors, (0), 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, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:55:13,962 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:55:13,963 INFO L93 Difference]: Finished difference Result 29 states and 33 transitions. [2021-11-25 17:55:13,965 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 17:55:13,967 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 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 3 [2021-11-25 17:55:13,967 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:55:13,975 INFO L225 Difference]: With dead ends: 29 [2021-11-25 17:55:13,975 INFO L226 Difference]: Without dead ends: 28 [2021-11-25 17:55:13,977 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 17:55:13,983 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 28 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 17:55:13,984 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 16 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 17:55:14,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-11-25 17:55:14,014 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2021-11-25 17:55:14,015 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 17 states have (on average 1.8823529411764706) internal successors, (32), 27 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:55:14,017 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2021-11-25 17:55:14,018 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 3 [2021-11-25 17:55:14,018 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:55:14,019 INFO L470 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2021-11-25 17:55:14,019 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:55:14,019 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2021-11-25 17:55:14,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2021-11-25 17:55:14,021 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:55:14,021 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1] [2021-11-25 17:55:14,022 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-25 17:55:14,022 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-25 17:55:14,026 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:55:14,026 INFO L85 PathProgramCache]: Analyzing trace with hash 145850, now seen corresponding path program 1 times [2021-11-25 17:55:14,027 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:55:14,028 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [3971042] [2021-11-25 17:55:14,028 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:55:14,028 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:55:14,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:55:14,194 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 17:55:14,195 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:55:14,196 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [3971042] [2021-11-25 17:55:14,196 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [3971042] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:55:14,196 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 17:55:14,196 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 17:55:14,197 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1153982674] [2021-11-25 17:55:14,197 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:55:14,198 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 17:55:14,198 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:55:14,199 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 17:55:14,200 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 17:55:14,201 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:55:14,315 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:55:14,317 INFO L93 Difference]: Finished difference Result 52 states and 60 transitions. [2021-11-25 17:55:14,317 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 17:55:14,317 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 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 3 [2021-11-25 17:55:14,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:55:14,320 INFO L225 Difference]: With dead ends: 52 [2021-11-25 17:55:14,321 INFO L226 Difference]: Without dead ends: 52 [2021-11-25 17:55:14,321 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 17:55:14,326 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 86 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 86 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 30 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 17:55:14,328 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [86 Valid, 32 Invalid, 30 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 28 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 17:55:14,330 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-11-25 17:55:14,334 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 27. [2021-11-25 17:55:14,336 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 17 states have (on average 1.8235294117647058) internal successors, (31), 26 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:55:14,338 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 31 transitions. [2021-11-25 17:55:14,339 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 31 transitions. Word has length 3 [2021-11-25 17:55:14,340 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:55:14,341 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 31 transitions. [2021-11-25 17:55:14,341 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:55:14,341 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 31 transitions. [2021-11-25 17:55:14,341 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2021-11-25 17:55:14,342 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:55:14,343 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2021-11-25 17:55:14,344 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-25 17:55:14,345 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-25 17:55:14,345 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:55:14,346 INFO L85 PathProgramCache]: Analyzing trace with hash 4613597, now seen corresponding path program 1 times [2021-11-25 17:55:14,346 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:55:14,346 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [913294260] [2021-11-25 17:55:14,347 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:55:14,348 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:55:14,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:55:14,429 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 17:55:14,429 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:55:14,429 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [913294260] [2021-11-25 17:55:14,430 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [913294260] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:55:14,430 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 17:55:14,430 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 17:55:14,430 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1777904741] [2021-11-25 17:55:14,431 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:55:14,432 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 17:55:14,432 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:55:14,433 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 17:55:14,433 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 17:55:14,433 INFO L87 Difference]: Start difference. First operand 27 states and 31 transitions. Second operand has 4 states, 4 states have (on average 1.0) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:55:14,474 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:55:14,474 INFO L93 Difference]: Finished difference Result 31 states and 35 transitions. [2021-11-25 17:55:14,474 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 17:55:14,475 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.0) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 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 4 [2021-11-25 17:55:14,475 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:55:14,478 INFO L225 Difference]: With dead ends: 31 [2021-11-25 17:55:14,479 INFO L226 Difference]: Without dead ends: 31 [2021-11-25 17:55:14,480 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 17:55:14,487 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 33 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 22 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 17:55:14,491 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 40 Invalid, 22 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 17:55:14,493 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-11-25 17:55:14,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2021-11-25 17:55:14,499 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 18 states have (on average 1.7777777777777777) internal successors, (32), 27 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:55:14,501 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2021-11-25 17:55:14,502 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 4 [2021-11-25 17:55:14,502 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:55:14,503 INFO L470 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2021-11-25 17:55:14,503 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.0) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:55:14,504 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2021-11-25 17:55:14,504 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2021-11-25 17:55:14,505 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:55:14,505 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2021-11-25 17:55:14,505 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-25 17:55:14,506 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-25 17:55:14,506 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:55:14,506 INFO L85 PathProgramCache]: Analyzing trace with hash 4611231, now seen corresponding path program 1 times [2021-11-25 17:55:14,507 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:55:14,507 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [281778100] [2021-11-25 17:55:14,507 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:55:14,507 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:55:14,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:55:14,593 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 17:55:14,594 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:55:14,594 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [281778100] [2021-11-25 17:55:14,594 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [281778100] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:55:14,594 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 17:55:14,594 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 17:55:14,595 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [742787266] [2021-11-25 17:55:14,595 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:55:14,595 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 17:55:14,595 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:55:14,596 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 17:55:14,596 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 17:55:14,596 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:55:14,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:55:14,619 INFO L93 Difference]: Finished difference Result 29 states and 33 transitions. [2021-11-25 17:55:14,620 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 17:55:14,620 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 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 4 [2021-11-25 17:55:14,620 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:55:14,621 INFO L225 Difference]: With dead ends: 29 [2021-11-25 17:55:14,622 INFO L226 Difference]: Without dead ends: 29 [2021-11-25 17:55:14,622 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 17:55:14,629 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 1 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 17:55:14,631 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 42 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 18 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 17:55:14,632 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-11-25 17:55:14,638 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2021-11-25 17:55:14,639 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 19 states have (on average 1.736842105263158) internal successors, (33), 28 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:55:14,640 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2021-11-25 17:55:14,640 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 4 [2021-11-25 17:55:14,640 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:55:14,640 INFO L470 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2021-11-25 17:55:14,640 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:55:14,640 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2021-11-25 17:55:14,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-25 17:55:14,641 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:55:14,641 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-25 17:55:14,641 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-25 17:55:14,641 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-25 17:55:14,642 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:55:14,642 INFO L85 PathProgramCache]: Analyzing trace with hash 52575915, now seen corresponding path program 1 times [2021-11-25 17:55:14,642 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:55:14,642 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1594180390] [2021-11-25 17:55:14,643 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:55:14,643 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:55:14,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:55:14,708 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 17:55:14,708 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:55:14,708 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1594180390] [2021-11-25 17:55:14,708 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1594180390] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:55:14,709 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 17:55:14,709 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-11-25 17:55:14,709 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1476200926] [2021-11-25 17:55:14,709 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:55:14,710 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 17:55:14,710 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:55:14,711 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 17:55:14,711 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 17:55:14,711 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand has 3 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:55:14,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:55:14,747 INFO L93 Difference]: Finished difference Result 27 states and 31 transitions. [2021-11-25 17:55:14,747 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 17:55:14,748 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 0 states have call successors, (0), 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 6 [2021-11-25 17:55:14,748 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:55:14,749 INFO L225 Difference]: With dead ends: 27 [2021-11-25 17:55:14,749 INFO L226 Difference]: Without dead ends: 27 [2021-11-25 17:55:14,749 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 17:55:14,751 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 22 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 17 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 17:55:14,752 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 15 Invalid, 17 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 17:55:14,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-11-25 17:55:14,760 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2021-11-25 17:55:14,761 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 19 states have (on average 1.631578947368421) internal successors, (31), 26 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:55:14,761 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 31 transitions. [2021-11-25 17:55:14,761 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 31 transitions. Word has length 6 [2021-11-25 17:55:14,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:55:14,762 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 31 transitions. [2021-11-25 17:55:14,762 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:55:14,763 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 31 transitions. [2021-11-25 17:55:14,767 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-25 17:55:14,767 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:55:14,767 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-25 17:55:14,767 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-25 17:55:14,767 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-25 17:55:14,768 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:55:14,768 INFO L85 PathProgramCache]: Analyzing trace with hash 52575916, now seen corresponding path program 1 times [2021-11-25 17:55:14,768 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:55:14,768 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [655787092] [2021-11-25 17:55:14,768 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:55:14,769 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:55:14,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:55:14,849 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 17:55:14,849 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:55:14,849 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [655787092] [2021-11-25 17:55:14,850 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [655787092] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:55:14,850 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 17:55:14,850 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 17:55:14,850 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1842647013] [2021-11-25 17:55:14,850 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:55:14,851 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 17:55:14,851 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:55:14,851 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 17:55:14,851 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-25 17:55:14,852 INFO L87 Difference]: Start difference. First operand 27 states and 31 transitions. Second operand has 5 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:55:14,901 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:55:14,901 INFO L93 Difference]: Finished difference Result 28 states and 32 transitions. [2021-11-25 17:55:14,901 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 17:55:14,901 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 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 6 [2021-11-25 17:55:14,902 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:55:14,902 INFO L225 Difference]: With dead ends: 28 [2021-11-25 17:55:14,902 INFO L226 Difference]: Without dead ends: 28 [2021-11-25 17:55:14,916 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-25 17:55:14,916 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 28 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 45 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 17:55:14,917 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 42 Invalid, 45 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 17:55:14,918 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-11-25 17:55:14,919 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2021-11-25 17:55:14,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 20 states have (on average 1.6) internal successors, (32), 27 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:55:14,920 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2021-11-25 17:55:14,920 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 6 [2021-11-25 17:55:14,921 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:55:14,921 INFO L470 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2021-11-25 17:55:14,921 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:55:14,921 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2021-11-25 17:55:14,921 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-25 17:55:14,922 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:55:14,922 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:55:14,922 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-25 17:55:14,922 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-25 17:55:14,922 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:55:14,923 INFO L85 PathProgramCache]: Analyzing trace with hash -1014083248, now seen corresponding path program 1 times [2021-11-25 17:55:14,923 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:55:14,923 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1219327276] [2021-11-25 17:55:14,923 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:55:14,923 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:55:14,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:55:15,013 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 17:55:15,013 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:55:15,013 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1219327276] [2021-11-25 17:55:15,013 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1219327276] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 17:55:15,014 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [663840428] [2021-11-25 17:55:15,014 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:55:15,014 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:55:15,014 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:55:15,019 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:55:15,030 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 17:55:15,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:55:15,093 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 17:55:15,098 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:55:15,254 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 17:55:15,254 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:55:15,370 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 18 [2021-11-25 17:55:15,420 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 17:55:15,421 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [663840428] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:55:15,421 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2132692049] [2021-11-25 17:55:15,438 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-25 17:55:15,439 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 17:55:15,443 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 17:55:15,448 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 17:55:15,448 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 17:55:15,534 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:55:15,538 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 17:55:15,619 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 17:55:15,709 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:55:15,791 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:55:15,903 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:55:15,904 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 91 treesize of output 83 [2021-11-25 17:55:16,046 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:55:16,115 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:55:16,174 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 17:55:16,875 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '479#(and (<= |ULTIMATE.start_main_~length2~0#1| |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (< (select |#length| |ULTIMATE.start_main_~nondetString1~0#1.base|) (+ |ULTIMATE.start_main_~nondetString1~0#1.offset| |ULTIMATE.start_main_~length1~0#1|)) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (= |ULTIMATE.start_main_#t~malloc9#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc9#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-25 17:55:16,875 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 17:55:16,875 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 17:55:16,875 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 12 [2021-11-25 17:55:16,876 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1325002461] [2021-11-25 17:55:16,876 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 17:55:16,876 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-25 17:55:16,876 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:55:16,877 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-25 17:55:16,877 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=288, Unknown=0, NotChecked=0, Total=380 [2021-11-25 17:55:16,878 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand has 14 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:55:17,004 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:55:17,005 INFO L93 Difference]: Finished difference Result 28 states and 32 transitions. [2021-11-25 17:55:17,005 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 17:55:17,005 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 states have internal predecessors, (24), 0 states have call successors, (0), 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 8 [2021-11-25 17:55:17,005 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:55:17,006 INFO L225 Difference]: With dead ends: 28 [2021-11-25 17:55:17,006 INFO L226 Difference]: Without dead ends: 28 [2021-11-25 17:55:17,007 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 110 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=132, Invalid=374, Unknown=0, NotChecked=0, Total=506 [2021-11-25 17:55:17,007 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 105 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 105 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 17:55:17,008 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [105 Valid, 42 Invalid, 51 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 17:55:17,008 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-11-25 17:55:17,010 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2021-11-25 17:55:17,010 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 20 states have (on average 1.55) internal successors, (31), 26 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:55:17,011 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 31 transitions. [2021-11-25 17:55:17,011 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 31 transitions. Word has length 8 [2021-11-25 17:55:17,011 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:55:17,011 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 31 transitions. [2021-11-25 17:55:17,011 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:55:17,012 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 31 transitions. [2021-11-25 17:55:17,012 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-25 17:55:17,012 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:55:17,012 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1] [2021-11-25 17:55:17,039 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2021-11-25 17:55:17,229 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:55:17,229 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-25 17:55:17,229 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:55:17,229 INFO L85 PathProgramCache]: Analyzing trace with hash -1014085613, now seen corresponding path program 1 times [2021-11-25 17:55:17,230 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:55:17,230 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [507133877] [2021-11-25 17:55:17,230 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:55:17,230 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:55:17,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:55:17,362 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 17:55:17,362 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:55:17,362 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [507133877] [2021-11-25 17:55:17,363 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [507133877] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 17:55:17,363 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [749005991] [2021-11-25 17:55:17,363 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:55:17,363 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:55:17,363 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:55:17,368 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:55:17,375 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-25 17:55:17,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:55:17,452 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-25 17:55:17,453 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:55:17,490 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 17:55:17,490 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-25 17:55:17,607 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 17:55:17,608 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:55:17,781 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 17:55:17,781 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [749005991] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:55:17,781 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [651259228] [2021-11-25 17:55:17,783 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2021-11-25 17:55:17,784 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 17:55:17,784 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 17:55:17,784 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 17:55:17,784 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 17:55:17,820 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:55:17,821 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 17:55:17,888 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:55:17,940 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:55:17,982 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:55:18,053 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:55:18,055 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 91 treesize of output 83 [2021-11-25 17:55:18,149 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:55:18,198 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:55:18,229 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 17:55:18,740 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '601#(and (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_#t~nondet13#1| 127) (<= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc9#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 (+ 128 |ULTIMATE.start_main_#t~nondet13#1|)) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (< (select |#length| |ULTIMATE.start_main_~nondetString2~0#1.base|) (+ |ULTIMATE.start_main_~nondetString2~0#1.offset| |ULTIMATE.start_main_~i~1#1| 1)) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc9#1.base|) (<= 0 |#NULL.offset|) (<= |ULTIMATE.start_main_#t~malloc9#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-25 17:55:18,740 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 17:55:18,740 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 17:55:18,740 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 11 [2021-11-25 17:55:18,740 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [667770773] [2021-11-25 17:55:18,740 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 17:55:18,741 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-25 17:55:18,741 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:55:18,741 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-25 17:55:18,742 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=238, Unknown=0, NotChecked=0, Total=306 [2021-11-25 17:55:18,742 INFO L87 Difference]: Start difference. First operand 27 states and 31 transitions. Second operand has 13 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:55:18,837 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:55:18,837 INFO L93 Difference]: Finished difference Result 26 states and 30 transitions. [2021-11-25 17:55:18,837 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-25 17:55:18,838 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 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 8 [2021-11-25 17:55:18,838 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:55:18,838 INFO L225 Difference]: With dead ends: 26 [2021-11-25 17:55:18,838 INFO L226 Difference]: Without dead ends: 26 [2021-11-25 17:55:18,839 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 9 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 112 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=90, Invalid=290, Unknown=0, NotChecked=0, Total=380 [2021-11-25 17:55:18,840 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 71 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 71 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 54 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 17:55:18,840 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [71 Valid, 44 Invalid, 54 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 17:55:18,841 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-11-25 17:55:18,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2021-11-25 17:55:18,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 19 states have (on average 1.5263157894736843) internal successors, (29), 24 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:55:18,843 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 29 transitions. [2021-11-25 17:55:18,843 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 29 transitions. Word has length 8 [2021-11-25 17:55:18,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:55:18,843 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 29 transitions. [2021-11-25 17:55:18,843 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:55:18,843 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 29 transitions. [2021-11-25 17:55:18,844 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-25 17:55:18,844 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:55:18,844 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:55:18,881 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-25 17:55:19,046 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:55:19,047 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-25 17:55:19,047 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:55:19,047 INFO L85 PathProgramCache]: Analyzing trace with hash -1371809622, now seen corresponding path program 1 times [2021-11-25 17:55:19,047 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:55:19,047 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [548401748] [2021-11-25 17:55:19,047 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:55:19,047 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:55:19,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:55:19,129 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 17:55:19,129 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:55:19,129 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [548401748] [2021-11-25 17:55:19,129 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [548401748] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 17:55:19,130 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1677712710] [2021-11-25 17:55:19,130 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:55:19,130 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:55:19,130 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:55:19,131 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:55:19,147 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-25 17:55:19,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:55:19,188 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 17:55:19,189 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:55:19,300 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 17:55:19,301 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:55:19,361 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 18 [2021-11-25 17:55:19,402 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 17:55:19,403 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1677712710] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:55:19,403 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [55979092] [2021-11-25 17:55:19,405 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 17:55:19,405 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 17:55:19,405 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 17:55:19,405 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 17:55:19,406 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 17:55:19,446 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:55:19,448 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 17:55:19,486 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 17:55:19,529 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:55:19,571 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 17:55:19,654 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-25 17:55:19,655 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 87 treesize of output 86 [2021-11-25 17:55:19,727 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:55:19,758 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:55:19,907 INFO L354 Elim1Store]: treesize reduction 28, result has 44.0 percent of original size [2021-11-25 17:55:19,907 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 175 treesize of output 179 [2021-11-25 17:55:20,009 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 17:55:20,958 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [55979092] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:55:20,959 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-25 17:55:20,959 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [4, 5, 5] total 19 [2021-11-25 17:55:20,960 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1796160445] [2021-11-25 17:55:20,960 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:55:20,960 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-25 17:55:20,960 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:55:20,961 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-25 17:55:20,961 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=307, Unknown=0, NotChecked=0, Total=420 [2021-11-25 17:55:20,961 INFO L87 Difference]: Start difference. First operand 25 states and 29 transitions. Second operand has 8 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 7 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:55:21,300 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:55:21,300 INFO L93 Difference]: Finished difference Result 24 states and 28 transitions. [2021-11-25 17:55:21,301 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-25 17:55:21,301 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 7 states have internal predecessors, (9), 0 states have call successors, (0), 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 9 [2021-11-25 17:55:21,302 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:55:21,302 INFO L225 Difference]: With dead ends: 24 [2021-11-25 17:55:21,302 INFO L226 Difference]: Without dead ends: 24 [2021-11-25 17:55:21,302 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 9 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 167 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=123, Invalid=339, Unknown=0, NotChecked=0, Total=462 [2021-11-25 17:55:21,303 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 19 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 63 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 67 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 63 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 17:55:21,303 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 30 Invalid, 67 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 63 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 17:55:21,304 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-11-25 17:55:21,305 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2021-11-25 17:55:21,305 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 19 states have (on average 1.4736842105263157) internal successors, (28), 23 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:55:21,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 28 transitions. [2021-11-25 17:55:21,306 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 28 transitions. Word has length 9 [2021-11-25 17:55:21,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:55:21,306 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 28 transitions. [2021-11-25 17:55:21,306 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 7 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:55:21,306 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 28 transitions. [2021-11-25 17:55:21,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-25 17:55:21,307 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:55:21,307 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:55:21,344 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-25 17:55:21,507 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-11-25 17:55:21,508 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr8REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-25 17:55:21,508 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:55:21,508 INFO L85 PathProgramCache]: Analyzing trace with hash 245961244, now seen corresponding path program 1 times [2021-11-25 17:55:21,508 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:55:21,508 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [530617671] [2021-11-25 17:55:21,508 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:55:21,509 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:55:21,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:55:21,573 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 17:55:21,573 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:55:21,573 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [530617671] [2021-11-25 17:55:21,574 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [530617671] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:55:21,574 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 17:55:21,574 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 17:55:21,574 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [84494324] [2021-11-25 17:55:21,574 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:55:21,574 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 17:55:21,575 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:55:21,575 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 17:55:21,575 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 17:55:21,575 INFO L87 Difference]: Start difference. First operand 24 states and 28 transitions. Second operand has 5 states, 4 states have (on average 2.75) internal successors, (11), 5 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:55:21,611 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:55:21,611 INFO L93 Difference]: Finished difference Result 23 states and 27 transitions. [2021-11-25 17:55:21,612 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 17:55:21,612 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.75) internal successors, (11), 5 states have internal predecessors, (11), 0 states have call successors, (0), 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 11 [2021-11-25 17:55:21,612 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:55:21,612 INFO L225 Difference]: With dead ends: 23 [2021-11-25 17:55:21,613 INFO L226 Difference]: Without dead ends: 23 [2021-11-25 17:55:21,613 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-25 17:55:21,614 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 30 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 17:55:21,614 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 21 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 17:55:21,615 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-11-25 17:55:21,625 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2021-11-25 17:55:21,626 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 19 states have (on average 1.4210526315789473) internal successors, (27), 22 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:55:21,626 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 27 transitions. [2021-11-25 17:55:21,627 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 27 transitions. Word has length 11 [2021-11-25 17:55:21,627 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:55:21,627 INFO L470 AbstractCegarLoop]: Abstraction has 23 states and 27 transitions. [2021-11-25 17:55:21,627 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.75) internal successors, (11), 5 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:55:21,627 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 27 transitions. [2021-11-25 17:55:21,628 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-25 17:55:21,628 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:55:21,628 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:55:21,628 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-25 17:55:21,629 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-25 17:55:21,629 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:55:21,629 INFO L85 PathProgramCache]: Analyzing trace with hash 245961245, now seen corresponding path program 1 times [2021-11-25 17:55:21,629 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:55:21,629 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1744939493] [2021-11-25 17:55:21,630 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:55:21,630 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:55:21,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:55:21,725 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 17:55:21,726 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:55:21,726 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1744939493] [2021-11-25 17:55:21,726 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1744939493] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 17:55:21,726 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1728368860] [2021-11-25 17:55:21,726 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:55:21,727 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:55:21,727 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:55:21,728 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:55:21,732 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-25 17:55:21,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:55:21,793 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-25 17:55:21,794 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:55:21,880 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 17:55:21,880 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:55:21,928 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-25 17:55:21,941 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 17:55:21,941 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1728368860] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:55:21,941 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1043747623] [2021-11-25 17:55:21,944 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 17:55:21,945 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 17:55:21,945 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 17:55:21,945 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 17:55:21,945 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 17:55:21,989 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:55:21,991 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 17:55:22,030 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 17:55:22,083 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:55:22,120 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:55:22,178 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:55:22,179 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 91 treesize of output 83 [2021-11-25 17:55:22,293 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:55:22,345 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:55:22,396 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:55:22,461 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 17:55:22,461 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 17:55:22,529 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 17:55:23,464 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [1043747623] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:55:23,464 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-25 17:55:23,464 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [4, 4, 4] total 16 [2021-11-25 17:55:23,464 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1108679124] [2021-11-25 17:55:23,464 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:55:23,465 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-25 17:55:23,465 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:55:23,465 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-25 17:55:23,465 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=234, Unknown=0, NotChecked=0, Total=306 [2021-11-25 17:55:23,466 INFO L87 Difference]: Start difference. First operand 23 states and 27 transitions. Second operand has 10 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 9 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:55:23,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:55:23,561 INFO L93 Difference]: Finished difference Result 26 states and 31 transitions. [2021-11-25 17:55:23,561 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-25 17:55:23,561 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 9 states have internal predecessors, (11), 0 states have call successors, (0), 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 11 [2021-11-25 17:55:23,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:55:23,562 INFO L225 Difference]: With dead ends: 26 [2021-11-25 17:55:23,562 INFO L226 Difference]: Without dead ends: 26 [2021-11-25 17:55:23,562 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 18 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=72, Invalid=234, Unknown=0, NotChecked=0, Total=306 [2021-11-25 17:55:23,563 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 40 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 80 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 87 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 80 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 17:55:23,563 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 36 Invalid, 87 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 80 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 17:55:23,564 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-11-25 17:55:23,565 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2021-11-25 17:55:23,565 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 21 states have (on average 1.380952380952381) internal successors, (29), 24 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:55:23,565 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 29 transitions. [2021-11-25 17:55:23,565 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 29 transitions. Word has length 11 [2021-11-25 17:55:23,566 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:55:23,566 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 29 transitions. [2021-11-25 17:55:23,566 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 9 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:55:23,566 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 29 transitions. [2021-11-25 17:55:23,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-25 17:55:23,567 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:55:23,567 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:55:23,592 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-25 17:55:23,775 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-25 17:55:23,776 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr10REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-25 17:55:23,776 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:55:23,776 INFO L85 PathProgramCache]: Analyzing trace with hash 218534883, now seen corresponding path program 1 times [2021-11-25 17:55:23,776 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:55:23,776 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1079787481] [2021-11-25 17:55:23,777 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:55:23,777 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:55:23,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:55:23,842 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 17:55:23,842 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:55:23,843 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1079787481] [2021-11-25 17:55:23,843 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1079787481] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:55:23,843 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 17:55:23,843 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-25 17:55:23,846 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [981203715] [2021-11-25 17:55:23,847 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:55:23,847 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 17:55:23,847 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:55:23,847 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 17:55:23,848 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 17:55:23,848 INFO L87 Difference]: Start difference. First operand 25 states and 29 transitions. Second operand has 6 states, 5 states have (on average 2.8) internal successors, (14), 6 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:55:23,912 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:55:23,912 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2021-11-25 17:55:23,913 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 17:55:23,913 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.8) internal successors, (14), 6 states have internal predecessors, (14), 0 states have call successors, (0), 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 14 [2021-11-25 17:55:23,913 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:55:23,914 INFO L225 Difference]: With dead ends: 27 [2021-11-25 17:55:23,914 INFO L226 Difference]: Without dead ends: 27 [2021-11-25 17:55:23,914 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2021-11-25 17:55:23,915 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 40 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 55 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 55 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 17:55:23,916 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 32 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 55 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 17:55:23,917 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-11-25 17:55:23,919 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 24. [2021-11-25 17:55:23,919 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 21 states have (on average 1.3333333333333333) internal successors, (28), 23 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:55:23,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 28 transitions. [2021-11-25 17:55:23,921 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 28 transitions. Word has length 14 [2021-11-25 17:55:23,921 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:55:23,921 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 28 transitions. [2021-11-25 17:55:23,921 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.8) internal successors, (14), 6 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:55:23,922 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 28 transitions. [2021-11-25 17:55:23,923 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-25 17:55:23,923 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:55:23,923 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:55:23,923 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-11-25 17:55:23,923 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-25 17:55:23,924 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:55:23,924 INFO L85 PathProgramCache]: Analyzing trace with hash 218534884, now seen corresponding path program 1 times [2021-11-25 17:55:23,924 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:55:23,924 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [955686230] [2021-11-25 17:55:23,924 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:55:23,925 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:55:23,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:55:24,055 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 17:55:24,056 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:55:24,056 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [955686230] [2021-11-25 17:55:24,056 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [955686230] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 17:55:24,056 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1280562715] [2021-11-25 17:55:24,056 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:55:24,056 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:55:24,057 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:55:24,060 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:55:24,082 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-25 17:55:24,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:55:24,129 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-25 17:55:24,130 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:55:24,269 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 17:55:24,269 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:55:24,324 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-25 17:55:24,344 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 17:55:24,344 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1280562715] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:55:24,344 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1075359122] [2021-11-25 17:55:24,347 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 17:55:24,347 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 17:55:24,347 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 17:55:24,348 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 17:55:24,348 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 17:55:24,386 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:55:24,388 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 17:55:24,435 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 17:55:24,493 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:55:24,527 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:55:24,583 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:55:24,584 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 91 treesize of output 83 [2021-11-25 17:55:24,656 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:55:24,702 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:55:24,762 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:55:24,824 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 17:55:24,824 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 17:55:24,970 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 17:55:26,703 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [1075359122] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:55:26,703 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-25 17:55:26,704 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [7, 6, 6] total 24 [2021-11-25 17:55:26,704 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [729611498] [2021-11-25 17:55:26,704 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:55:26,704 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-25 17:55:26,705 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:55:26,705 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-25 17:55:26,705 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=514, Unknown=0, NotChecked=0, Total=650 [2021-11-25 17:55:26,706 INFO L87 Difference]: Start difference. First operand 24 states and 28 transitions. Second operand has 13 states, 12 states have (on average 1.1666666666666667) internal successors, (14), 12 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:55:26,840 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:55:26,840 INFO L93 Difference]: Finished difference Result 28 states and 34 transitions. [2021-11-25 17:55:26,840 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-25 17:55:26,840 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 1.1666666666666667) internal successors, (14), 12 states have internal predecessors, (14), 0 states have call successors, (0), 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 14 [2021-11-25 17:55:26,840 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:55:26,841 INFO L225 Difference]: With dead ends: 28 [2021-11-25 17:55:26,841 INFO L226 Difference]: Without dead ends: 28 [2021-11-25 17:55:26,841 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 179 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=136, Invalid=514, Unknown=0, NotChecked=0, Total=650 [2021-11-25 17:55:26,842 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 25 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 112 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 118 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 112 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 17:55:26,843 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [25 Valid, 30 Invalid, 118 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 112 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 17:55:26,843 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-11-25 17:55:26,844 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2021-11-25 17:55:26,844 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 24 states have (on average 1.3333333333333333) internal successors, (32), 26 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:55:26,845 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 32 transitions. [2021-11-25 17:55:26,845 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 32 transitions. Word has length 14 [2021-11-25 17:55:26,845 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:55:26,845 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 32 transitions. [2021-11-25 17:55:26,845 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 1.1666666666666667) internal successors, (14), 12 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:55:26,845 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 32 transitions. [2021-11-25 17:55:26,846 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-25 17:55:26,846 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:55:26,846 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:55:26,870 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-25 17:55:27,059 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:55:27,060 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr12ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-25 17:55:27,060 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:55:27,060 INFO L85 PathProgramCache]: Analyzing trace with hash -1815390876, now seen corresponding path program 1 times [2021-11-25 17:55:27,060 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:55:27,060 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1785479924] [2021-11-25 17:55:27,060 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:55:27,060 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:55:27,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:55:27,117 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 17:55:27,117 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:55:27,117 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1785479924] [2021-11-25 17:55:27,117 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1785479924] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:55:27,117 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 17:55:27,117 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 17:55:27,118 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [204995877] [2021-11-25 17:55:27,118 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:55:27,118 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 17:55:27,118 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:55:27,118 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 17:55:27,119 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 17:55:27,119 INFO L87 Difference]: Start difference. First operand 27 states and 32 transitions. Second operand has 4 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:55:27,135 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:55:27,135 INFO L93 Difference]: Finished difference Result 26 states and 31 transitions. [2021-11-25 17:55:27,136 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 17:55:27,136 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 0 states have call successors, (0), 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 15 [2021-11-25 17:55:27,136 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:55:27,136 INFO L225 Difference]: With dead ends: 26 [2021-11-25 17:55:27,137 INFO L226 Difference]: Without dead ends: 23 [2021-11-25 17:55:27,137 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 17:55:27,137 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 9 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 20 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 17:55:27,138 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 26 Invalid, 20 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 17:55:27,138 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-11-25 17:55:27,139 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2021-11-25 17:55:27,140 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 21 states have (on average 1.2380952380952381) internal successors, (26), 22 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:55:27,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 26 transitions. [2021-11-25 17:55:27,140 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 26 transitions. Word has length 15 [2021-11-25 17:55:27,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:55:27,140 INFO L470 AbstractCegarLoop]: Abstraction has 23 states and 26 transitions. [2021-11-25 17:55:27,140 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:55:27,141 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 26 transitions. [2021-11-25 17:55:27,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-25 17:55:27,141 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:55:27,141 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:55:27,141 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-11-25 17:55:27,142 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-25 17:55:27,142 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:55:27,142 INFO L85 PathProgramCache]: Analyzing trace with hash -796716973, now seen corresponding path program 1 times [2021-11-25 17:55:27,142 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:55:27,142 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1410677533] [2021-11-25 17:55:27,142 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:55:27,143 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:55:27,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:55:27,400 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 17:55:27,400 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:55:27,400 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1410677533] [2021-11-25 17:55:27,400 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1410677533] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 17:55:27,400 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1699544479] [2021-11-25 17:55:27,400 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:55:27,401 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:55:27,401 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:55:27,406 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:55:27,408 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-25 17:55:27,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:55:27,485 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 66 conjunts are in the unsatisfiable core [2021-11-25 17:55:27,487 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:55:27,703 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:55:27,779 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 17:55:27,779 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 23 [2021-11-25 17:55:27,790 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 3 [2021-11-25 17:55:28,144 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 8 [2021-11-25 17:55:28,170 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 17:55:28,171 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:55:28,396 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 17:55:28,397 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 22 [2021-11-25 17:55:28,405 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 17:55:28,406 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 33 treesize of output 33 [2021-11-25 17:55:28,414 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 17:55:28,415 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 16 treesize of output 20 [2021-11-25 17:55:28,738 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 17:55:28,738 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1699544479] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:55:28,739 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1322526437] [2021-11-25 17:55:28,741 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 17:55:28,741 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 17:55:28,741 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 17:55:28,741 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 17:55:28,741 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 17:55:28,782 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:55:28,784 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 17:55:28,820 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:55:28,859 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:55:28,910 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:55:28,970 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:55:28,972 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 91 treesize of output 83 [2021-11-25 17:55:29,038 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:55:29,086 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:55:29,130 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:55:29,193 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 17:55:29,194 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 17:55:30,445 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 17:55:33,758 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1371#(and (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (< (select |#length| |ULTIMATE.start_cstrpbrk_#t~post2#1.base|) (+ |ULTIMATE.start_cstrpbrk_#t~post2#1.offset| 1)) (= |ULTIMATE.start_main_#t~malloc9#1.offset| 0) (or (and (<= 0 |ULTIMATE.start_cstrpbrk_~scanp~0#1.base|) (<= |ULTIMATE.start_cstrpbrk_~s2#1.offset| 0) (<= 0 |ULTIMATE.start_cstrpbrk_~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrpbrk_~scanp~0#1.offset|) (<= |ULTIMATE.start_cstrpbrk_#in~s2#1.offset| 0) (<= |ULTIMATE.start_cstrpbrk_#in~s1#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrpbrk_#in~s1#1.base|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrpbrk_~sc~0#1|) (<= 0 |ULTIMATE.start_cstrpbrk_~s1#1.base|) (<= 0 |ULTIMATE.start_cstrpbrk_#in~s2#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrpbrk_~sc~0#1| 0) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 |ULTIMATE.start_cstrpbrk_~s2#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrpbrk_#in~s2#1.offset|) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc9#1.base|) (<= 1 |ULTIMATE.start_cstrpbrk_#t~post2#1.offset|) (<= |ULTIMATE.start_cstrpbrk_~scanp~0#1.offset| 1) (<= 0 |ULTIMATE.start_cstrpbrk_#t~post2#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 2 |ULTIMATE.start_cstrpbrk_~s1#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 0 |ULTIMATE.start_cstrpbrk_#in~s1#1.offset|)) (and (<= |ULTIMATE.start_cstrpbrk_~s2#1.offset| 0) (<= 1 |ULTIMATE.start_cstrpbrk_~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrpbrk_~s2#1.offset|) (<= |ULTIMATE.start_cstrpbrk_#in~s2#1.offset| 0) (<= |ULTIMATE.start_cstrpbrk_#in~s1#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrpbrk_#in~s1#1.base|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_cstrpbrk_#t~post2#1.offset| 0) (<= 0 |ULTIMATE.start_cstrpbrk_~s1#1.base|) (<= 0 |ULTIMATE.start_cstrpbrk_#in~s2#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrpbrk_~s1#1.offset| 1) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 |ULTIMATE.start_cstrpbrk_~s2#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrpbrk_#in~s2#1.offset|) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrpbrk_#t~post2#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc9#1.base|) (<= 0 |ULTIMATE.start_cstrpbrk_#t~post2#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 0 |ULTIMATE.start_cstrpbrk_#in~s1#1.offset|))) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2021-11-25 17:55:33,759 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 17:55:33,759 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 17:55:33,759 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 15, 14] total 35 [2021-11-25 17:55:33,759 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [914542453] [2021-11-25 17:55:33,759 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 17:55:33,760 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-11-25 17:55:33,760 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:55:33,760 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-11-25 17:55:33,761 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=2181, Unknown=0, NotChecked=0, Total=2352 [2021-11-25 17:55:33,762 INFO L87 Difference]: Start difference. First operand 23 states and 26 transitions. Second operand has 36 states, 36 states have (on average 1.2777777777777777) internal successors, (46), 35 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:55:34,548 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:55:34,548 INFO L93 Difference]: Finished difference Result 42 states and 47 transitions. [2021-11-25 17:55:34,548 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-25 17:55:34,548 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 1.2777777777777777) internal successors, (46), 35 states have internal predecessors, (46), 0 states have call successors, (0), 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 17 [2021-11-25 17:55:34,549 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:55:34,549 INFO L225 Difference]: With dead ends: 42 [2021-11-25 17:55:34,549 INFO L226 Difference]: Without dead ends: 29 [2021-11-25 17:55:34,550 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 749 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=312, Invalid=3228, Unknown=0, NotChecked=0, Total=3540 [2021-11-25 17:55:34,551 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 72 mSDsluCounter, 157 mSDsCounter, 0 mSdLazyCounter, 310 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 137 SdHoareTripleChecker+Invalid, 431 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 310 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 93 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 17:55:34,551 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [72 Valid, 137 Invalid, 431 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 310 Invalid, 0 Unknown, 93 Unchecked, 0.2s Time] [2021-11-25 17:55:34,552 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-11-25 17:55:34,553 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 25. [2021-11-25 17:55:34,553 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 23 states have (on average 1.2173913043478262) internal successors, (28), 24 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:55:34,554 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 28 transitions. [2021-11-25 17:55:34,554 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 28 transitions. Word has length 17 [2021-11-25 17:55:34,554 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:55:34,554 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 28 transitions. [2021-11-25 17:55:34,554 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 1.2777777777777777) internal successors, (46), 35 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:55:34,554 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 28 transitions. [2021-11-25 17:55:34,555 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-25 17:55:34,555 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:55:34,555 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:55:34,593 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-25 17:55:34,771 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-25 17:55:34,772 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-25 17:55:34,772 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:55:34,772 INFO L85 PathProgramCache]: Analyzing trace with hash -336862777, now seen corresponding path program 2 times [2021-11-25 17:55:34,772 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:55:34,772 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [292242167] [2021-11-25 17:55:34,772 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:55:34,772 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:55:34,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:55:34,854 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 17:55:34,854 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:55:34,854 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [292242167] [2021-11-25 17:55:34,855 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [292242167] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 17:55:34,855 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1863381656] [2021-11-25 17:55:34,855 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 17:55:34,855 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:55:34,855 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:55:34,856 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:55:34,878 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-25 17:55:34,932 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-25 17:55:34,932 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 17:55:34,934 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 52 conjunts are in the unsatisfiable core [2021-11-25 17:55:34,937 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:55:35,042 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:55:35,112 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 17:55:35,113 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 17:55:35,303 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 17:55:35,320 INFO L354 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2021-11-25 17:55:35,320 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 27 treesize of output 26 [2021-11-25 17:55:35,426 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 17:55:35,427 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:55:36,861 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-25 17:55:36,870 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 42 [2021-11-25 17:55:37,152 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 17:55:37,152 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1863381656] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:55:37,152 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [384317597] [2021-11-25 17:55:37,154 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 17:55:37,154 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 17:55:37,155 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 17:55:37,155 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 17:55:37,155 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 17:55:37,185 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:55:37,186 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 17:55:37,222 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:55:37,269 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:55:37,308 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:55:37,363 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:55:37,364 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 91 treesize of output 83 [2021-11-25 17:55:37,430 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:55:37,464 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:55:37,516 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:55:37,568 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 17:55:37,569 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 17:55:38,684 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 17:55:41,933 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1610#(and (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (< (select |#length| |ULTIMATE.start_cstrpbrk_#t~post2#1.base|) (+ |ULTIMATE.start_cstrpbrk_#t~post2#1.offset| 1)) (= |ULTIMATE.start_main_#t~malloc9#1.offset| 0) (or (and (<= 0 |ULTIMATE.start_cstrpbrk_~scanp~0#1.base|) (<= |ULTIMATE.start_cstrpbrk_~s2#1.offset| 0) (<= 0 |ULTIMATE.start_cstrpbrk_~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrpbrk_~scanp~0#1.offset|) (<= |ULTIMATE.start_cstrpbrk_#in~s2#1.offset| 0) (<= |ULTIMATE.start_cstrpbrk_#in~s1#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrpbrk_#in~s1#1.base|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrpbrk_~sc~0#1|) (<= 0 |ULTIMATE.start_cstrpbrk_~s1#1.base|) (<= 0 |ULTIMATE.start_cstrpbrk_#in~s2#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrpbrk_~sc~0#1| 0) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 |ULTIMATE.start_cstrpbrk_~s2#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrpbrk_#in~s2#1.offset|) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc9#1.base|) (<= 1 |ULTIMATE.start_cstrpbrk_#t~post2#1.offset|) (<= |ULTIMATE.start_cstrpbrk_~scanp~0#1.offset| 1) (<= 0 |ULTIMATE.start_cstrpbrk_#t~post2#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 2 |ULTIMATE.start_cstrpbrk_~s1#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 0 |ULTIMATE.start_cstrpbrk_#in~s1#1.offset|)) (and (<= |ULTIMATE.start_cstrpbrk_~s2#1.offset| 0) (<= 1 |ULTIMATE.start_cstrpbrk_~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrpbrk_~s2#1.offset|) (<= |ULTIMATE.start_cstrpbrk_#in~s2#1.offset| 0) (<= |ULTIMATE.start_cstrpbrk_#in~s1#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrpbrk_#in~s1#1.base|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_cstrpbrk_#t~post2#1.offset| 0) (<= 0 |ULTIMATE.start_cstrpbrk_~s1#1.base|) (<= 0 |ULTIMATE.start_cstrpbrk_#in~s2#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrpbrk_~s1#1.offset| 1) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 |ULTIMATE.start_cstrpbrk_~s2#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrpbrk_#in~s2#1.offset|) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrpbrk_#t~post2#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc9#1.base|) (<= 0 |ULTIMATE.start_cstrpbrk_#t~post2#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 0 |ULTIMATE.start_cstrpbrk_#in~s1#1.offset|))) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2021-11-25 17:55:41,933 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 17:55:41,933 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 17:55:41,933 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 10, 10] total 27 [2021-11-25 17:55:41,934 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2051266347] [2021-11-25 17:55:41,934 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 17:55:41,934 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-25 17:55:41,934 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:55:41,935 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-25 17:55:41,936 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=250, Invalid=1472, Unknown=0, NotChecked=0, Total=1722 [2021-11-25 17:55:41,936 INFO L87 Difference]: Start difference. First operand 25 states and 28 transitions. Second operand has 29 states, 28 states have (on average 1.8928571428571428) internal successors, (53), 28 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) [2021-11-25 17:55:42,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:55:42,320 INFO L93 Difference]: Finished difference Result 51 states and 57 transitions. [2021-11-25 17:55:42,320 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-25 17:55:42,321 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 28 states have (on average 1.8928571428571428) internal successors, (53), 28 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 19 [2021-11-25 17:55:42,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:55:42,322 INFO L225 Difference]: With dead ends: 51 [2021-11-25 17:55:42,323 INFO L226 Difference]: Without dead ends: 51 [2021-11-25 17:55:42,324 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 24 SyntacticMatches, 1 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 650 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=392, Invalid=2158, Unknown=0, NotChecked=0, Total=2550 [2021-11-25 17:55:42,324 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 83 mSDsluCounter, 88 mSDsCounter, 0 mSdLazyCounter, 215 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 83 SdHoareTripleChecker+Valid, 95 SdHoareTripleChecker+Invalid, 253 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 215 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 21 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 17:55:42,325 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [83 Valid, 95 Invalid, 253 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 215 Invalid, 0 Unknown, 21 Unchecked, 0.2s Time] [2021-11-25 17:55:42,325 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-11-25 17:55:42,327 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 31. [2021-11-25 17:55:42,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 29 states have (on average 1.2413793103448276) internal successors, (36), 30 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:55:42,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 36 transitions. [2021-11-25 17:55:42,328 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 36 transitions. Word has length 19 [2021-11-25 17:55:42,329 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:55:42,329 INFO L470 AbstractCegarLoop]: Abstraction has 31 states and 36 transitions. [2021-11-25 17:55:42,329 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 28 states have (on average 1.8928571428571428) internal successors, (53), 28 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) [2021-11-25 17:55:42,329 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 36 transitions. [2021-11-25 17:55:42,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-25 17:55:42,330 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:55:42,330 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:55:42,368 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-25 17:55:42,551 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-25 17:55:42,552 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-25 17:55:42,552 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:55:42,552 INFO L85 PathProgramCache]: Analyzing trace with hash -1852725578, now seen corresponding path program 1 times [2021-11-25 17:55:42,552 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:55:42,552 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [7068487] [2021-11-25 17:55:42,552 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:55:42,553 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:55:42,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:55:42,724 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 17:55:42,724 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:55:42,725 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [7068487] [2021-11-25 17:55:42,725 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [7068487] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 17:55:42,725 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [60807346] [2021-11-25 17:55:42,725 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:55:42,725 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:55:42,726 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:55:42,729 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:55:42,730 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-25 17:55:42,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:55:42,795 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 39 conjunts are in the unsatisfiable core [2021-11-25 17:55:42,797 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:55:42,892 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:55:43,141 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 17:55:43,141 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 20 treesize of output 20 [2021-11-25 17:55:43,265 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 17:55:43,265 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:55:43,578 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-25 17:55:43,581 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-11-25 17:55:43,751 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 39 [2021-11-25 17:55:43,818 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 17:55:43,818 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [60807346] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:55:43,818 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [755446304] [2021-11-25 17:55:43,820 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 17:55:43,820 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 17:55:43,821 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 17:55:43,821 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 17:55:43,821 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 17:55:43,854 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:55:43,855 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 17:55:43,888 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 17:55:43,934 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:55:43,964 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 17:55:44,034 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-25 17:55:44,034 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 87 treesize of output 86 [2021-11-25 17:55:44,110 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:55:44,137 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:55:44,277 INFO L354 Elim1Store]: treesize reduction 28, result has 44.0 percent of original size [2021-11-25 17:55:44,278 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 175 treesize of output 179 [2021-11-25 17:55:44,428 INFO L354 Elim1Store]: treesize reduction 68, result has 37.6 percent of original size [2021-11-25 17:55:44,428 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 193 treesize of output 208 [2021-11-25 17:55:45,096 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 17:55:50,069 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1870#(and (<= 0 |ULTIMATE.start_cstrpbrk_~scanp~0#1.base|) (<= |ULTIMATE.start_cstrpbrk_~s2#1.offset| 0) (<= 1 |ULTIMATE.start_cstrpbrk_~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrpbrk_~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrpbrk_~scanp~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cstrpbrk_#in~s2#1.offset| 0) (<= |ULTIMATE.start_cstrpbrk_#in~s1#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrpbrk_#in~s1#1.base|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrpbrk_#t~post4#1.offset|) (<= 0 |ULTIMATE.start_cstrpbrk_~s1#1.base|) (<= 0 |ULTIMATE.start_cstrpbrk_#in~s2#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrpbrk_~s1#1.offset| 1) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (= |ULTIMATE.start_main_#t~malloc9#1.offset| 0) (<= 0 |ULTIMATE.start_cstrpbrk_~s2#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrpbrk_#in~s2#1.offset|) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (< (select |#length| |ULTIMATE.start_cstrpbrk_#t~post4#1.base|) (+ |ULTIMATE.start_cstrpbrk_#t~post4#1.offset| 1)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc9#1.base|) (<= 0 |ULTIMATE.start_cstrpbrk_#t~post4#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 0 |ULTIMATE.start_cstrpbrk_#in~s1#1.offset|) (= |#NULL.base| 0))' at error location [2021-11-25 17:55:50,069 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 17:55:50,069 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 17:55:50,069 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11, 11] total 30 [2021-11-25 17:55:50,069 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1602658685] [2021-11-25 17:55:50,069 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 17:55:50,070 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2021-11-25 17:55:50,070 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:55:50,070 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-11-25 17:55:50,071 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=202, Invalid=1688, Unknown=2, NotChecked=0, Total=1892 [2021-11-25 17:55:50,071 INFO L87 Difference]: Start difference. First operand 31 states and 36 transitions. Second operand has 30 states, 30 states have (on average 1.7) internal successors, (51), 30 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:55:50,787 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:55:50,787 INFO L93 Difference]: Finished difference Result 54 states and 63 transitions. [2021-11-25 17:55:50,787 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-25 17:55:50,787 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 1.7) internal successors, (51), 30 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-11-25 17:55:50,787 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:55:50,788 INFO L225 Difference]: With dead ends: 54 [2021-11-25 17:55:50,788 INFO L226 Difference]: Without dead ends: 54 [2021-11-25 17:55:50,789 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 669 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=329, Invalid=2749, Unknown=2, NotChecked=0, Total=3080 [2021-11-25 17:55:50,790 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 70 mSDsluCounter, 158 mSDsCounter, 0 mSdLazyCounter, 302 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 SdHoareTripleChecker+Valid, 144 SdHoareTripleChecker+Invalid, 419 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 302 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 96 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 17:55:50,790 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [70 Valid, 144 Invalid, 419 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 302 Invalid, 0 Unknown, 96 Unchecked, 0.2s Time] [2021-11-25 17:55:50,791 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-11-25 17:55:50,792 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 45. [2021-11-25 17:55:50,792 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 43 states have (on average 1.2093023255813953) internal successors, (52), 44 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:55:50,793 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 52 transitions. [2021-11-25 17:55:50,793 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 52 transitions. Word has length 20 [2021-11-25 17:55:50,793 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:55:50,793 INFO L470 AbstractCegarLoop]: Abstraction has 45 states and 52 transitions. [2021-11-25 17:55:50,794 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 1.7) internal successors, (51), 30 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:55:50,794 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 52 transitions. [2021-11-25 17:55:50,794 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-25 17:55:50,795 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:55:50,795 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:55:50,825 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2021-11-25 17:55:51,014 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:55:51,014 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-25 17:55:51,015 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:55:51,015 INFO L85 PathProgramCache]: Analyzing trace with hash 1860873210, now seen corresponding path program 1 times [2021-11-25 17:55:51,015 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:55:51,015 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1814647695] [2021-11-25 17:55:51,015 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:55:51,015 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:55:51,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:55:51,150 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-25 17:55:51,150 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:55:51,150 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1814647695] [2021-11-25 17:55:51,150 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1814647695] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 17:55:51,150 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1707977594] [2021-11-25 17:55:51,150 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:55:51,151 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:55:51,151 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:55:51,151 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:55:51,152 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-25 17:55:51,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:55:51,218 INFO L263 TraceCheckSpWp]: Trace formula consists of 194 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-25 17:55:51,219 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:55:51,350 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-25 17:55:51,350 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:55:51,430 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-25 17:55:51,458 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-25 17:55:51,458 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1707977594] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:55:51,458 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1335961425] [2021-11-25 17:55:51,460 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 17:55:51,460 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 17:55:51,461 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 17:55:51,461 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 17:55:51,461 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 17:55:51,491 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:55:51,492 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 17:55:51,530 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 17:55:51,571 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:55:51,604 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:55:51,653 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:55:51,654 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 91 treesize of output 83 [2021-11-25 17:55:51,718 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:55:51,761 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:55:51,806 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:55:51,850 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 17:55:51,851 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 17:55:52,735 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 17:55:55,231 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2148#(and (<= 0 |ULTIMATE.start_cstrpbrk_~scanp~0#1.base|) (<= |ULTIMATE.start_cstrpbrk_~s2#1.offset| 0) (<= 1 |ULTIMATE.start_cstrpbrk_~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrpbrk_~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrpbrk_~scanp~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cstrpbrk_#in~s2#1.offset| 0) (<= |ULTIMATE.start_cstrpbrk_#in~s1#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrpbrk_#in~s1#1.base|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrpbrk_#t~post4#1.offset|) (<= 0 |ULTIMATE.start_cstrpbrk_~s1#1.base|) (<= 0 |ULTIMATE.start_cstrpbrk_#in~s2#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrpbrk_#t~post4#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (= |ULTIMATE.start_main_#t~malloc9#1.offset| 0) (<= 0 |ULTIMATE.start_cstrpbrk_~s2#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrpbrk_#in~s2#1.offset|) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (< (select |#length| |ULTIMATE.start_cstrpbrk_#t~post4#1.base|) (+ |ULTIMATE.start_cstrpbrk_#t~post4#1.offset| 1)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc9#1.base|) (<= |ULTIMATE.start_cstrpbrk_~scanp~0#1.offset| 1) (<= 0 |ULTIMATE.start_cstrpbrk_#t~post4#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 0 |ULTIMATE.start_cstrpbrk_#in~s1#1.offset|) (= |#NULL.base| 0))' at error location [2021-11-25 17:55:55,231 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 17:55:55,231 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 17:55:55,232 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 6] total 13 [2021-11-25 17:55:55,232 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [20821724] [2021-11-25 17:55:55,232 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 17:55:55,232 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-25 17:55:55,232 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:55:55,233 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-25 17:55:55,233 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=633, Unknown=0, NotChecked=0, Total=756 [2021-11-25 17:55:55,233 INFO L87 Difference]: Start difference. First operand 45 states and 52 transitions. Second operand has 15 states, 14 states have (on average 2.5714285714285716) internal successors, (36), 14 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:55:55,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:55:55,395 INFO L93 Difference]: Finished difference Result 48 states and 56 transitions. [2021-11-25 17:55:55,396 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-25 17:55:55,396 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 2.5714285714285716) internal successors, (36), 14 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-11-25 17:55:55,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:55:55,397 INFO L225 Difference]: With dead ends: 48 [2021-11-25 17:55:55,397 INFO L226 Difference]: Without dead ends: 48 [2021-11-25 17:55:55,397 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 282 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=180, Invalid=876, Unknown=0, NotChecked=0, Total=1056 [2021-11-25 17:55:55,398 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 68 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 93 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 68 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 105 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 93 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 17:55:55,398 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [68 Valid, 28 Invalid, 105 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 93 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 17:55:55,399 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-11-25 17:55:55,400 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 47. [2021-11-25 17:55:55,401 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 45 states have (on average 1.2) internal successors, (54), 46 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) [2021-11-25 17:55:55,401 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 54 transitions. [2021-11-25 17:55:55,401 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 54 transitions. Word has length 22 [2021-11-25 17:55:55,402 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:55:55,402 INFO L470 AbstractCegarLoop]: Abstraction has 47 states and 54 transitions. [2021-11-25 17:55:55,402 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 2.5714285714285716) internal successors, (36), 14 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:55:55,402 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 54 transitions. [2021-11-25 17:55:55,403 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-25 17:55:55,403 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:55:55,403 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:55:55,427 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2021-11-25 17:55:55,615 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-25 17:55:55,616 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-25 17:55:55,616 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:55:55,616 INFO L85 PathProgramCache]: Analyzing trace with hash 2131884157, now seen corresponding path program 3 times [2021-11-25 17:55:55,616 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:55:55,616 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [111727956] [2021-11-25 17:55:55,616 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:55:55,616 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:55:55,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:55:55,929 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 17:55:55,929 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:55:55,929 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [111727956] [2021-11-25 17:55:55,929 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [111727956] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 17:55:55,929 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [613555487] [2021-11-25 17:55:55,929 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 17:55:55,929 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:55:55,929 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:55:55,930 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:55:55,931 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-25 17:55:56,010 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 17:55:56,010 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 17:55:56,012 INFO L263 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 45 conjunts are in the unsatisfiable core [2021-11-25 17:55:56,015 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:55:56,022 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 17:55:56,161 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:55:56,225 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 19 [2021-11-25 17:55:56,302 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-11-25 17:55:56,309 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 17:55:56,310 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:55:56,357 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_347 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base| v_ArrVal_347) |c_ULTIMATE.start_main_~nondetString1~0#1.base|) (+ |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 1)) 0)) is different from false [2021-11-25 17:55:56,363 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 17:55:56,364 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 24 [2021-11-25 17:55:56,368 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 17:55:56,369 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 37 [2021-11-25 17:55:56,376 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 17:55:56,516 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 17:55:56,516 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [613555487] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:55:56,516 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [953516845] [2021-11-25 17:55:56,518 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 17:55:56,518 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 17:55:56,518 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 17:55:56,518 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 17:55:56,519 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 17:55:56,545 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:55:56,547 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 17:55:56,575 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 17:55:56,620 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:55:56,647 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:55:56,692 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:55:56,692 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 91 treesize of output 83 [2021-11-25 17:55:56,749 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:55:56,816 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:55:56,860 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:55:56,906 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 17:55:56,906 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 17:55:57,896 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 17:56:00,888 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2434#(and (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (< (select |#length| |ULTIMATE.start_cstrpbrk_#t~post2#1.base|) (+ |ULTIMATE.start_cstrpbrk_#t~post2#1.offset| 1)) (= |ULTIMATE.start_main_#t~malloc9#1.offset| 0) (or (and (<= 0 |ULTIMATE.start_cstrpbrk_~scanp~0#1.base|) (<= |ULTIMATE.start_cstrpbrk_~s2#1.offset| 0) (<= 0 |ULTIMATE.start_cstrpbrk_~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrpbrk_~scanp~0#1.offset|) (<= |ULTIMATE.start_cstrpbrk_#in~s2#1.offset| 0) (<= |ULTIMATE.start_cstrpbrk_#in~s1#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrpbrk_#in~s1#1.base|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrpbrk_~sc~0#1|) (<= 0 |ULTIMATE.start_cstrpbrk_~s1#1.base|) (<= 0 |ULTIMATE.start_cstrpbrk_#in~s2#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrpbrk_~sc~0#1| 0) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 |ULTIMATE.start_cstrpbrk_~s2#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrpbrk_#in~s2#1.offset|) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc9#1.base|) (<= 1 |ULTIMATE.start_cstrpbrk_#t~post2#1.offset|) (<= |ULTIMATE.start_cstrpbrk_~scanp~0#1.offset| 1) (<= 0 |ULTIMATE.start_cstrpbrk_#t~post2#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 2 |ULTIMATE.start_cstrpbrk_~s1#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 0 |ULTIMATE.start_cstrpbrk_#in~s1#1.offset|)) (and (<= |ULTIMATE.start_cstrpbrk_~s2#1.offset| 0) (<= 1 |ULTIMATE.start_cstrpbrk_~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrpbrk_~s2#1.offset|) (<= |ULTIMATE.start_cstrpbrk_#in~s2#1.offset| 0) (<= |ULTIMATE.start_cstrpbrk_#in~s1#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrpbrk_#in~s1#1.base|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_cstrpbrk_#t~post2#1.offset| 0) (<= 0 |ULTIMATE.start_cstrpbrk_~s1#1.base|) (<= 0 |ULTIMATE.start_cstrpbrk_#in~s2#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrpbrk_~s1#1.offset| 1) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 |ULTIMATE.start_cstrpbrk_~s2#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrpbrk_#in~s2#1.offset|) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrpbrk_#t~post2#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc9#1.base|) (<= 0 |ULTIMATE.start_cstrpbrk_#t~post2#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 0 |ULTIMATE.start_cstrpbrk_#in~s1#1.offset|))) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2021-11-25 17:56:00,889 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 17:56:00,889 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 17:56:00,889 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11, 11] total 23 [2021-11-25 17:56:00,889 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1902546489] [2021-11-25 17:56:00,889 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 17:56:00,890 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-25 17:56:00,890 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:56:00,890 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-25 17:56:00,891 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=1149, Unknown=1, NotChecked=68, Total=1332 [2021-11-25 17:56:00,891 INFO L87 Difference]: Start difference. First operand 47 states and 54 transitions. Second operand has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:56:01,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:56:01,300 INFO L93 Difference]: Finished difference Result 82 states and 93 transitions. [2021-11-25 17:56:01,300 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-25 17:56:01,300 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 25 [2021-11-25 17:56:01,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:56:01,301 INFO L225 Difference]: With dead ends: 82 [2021-11-25 17:56:01,301 INFO L226 Difference]: Without dead ends: 71 [2021-11-25 17:56:01,302 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 47 SyntacticMatches, 3 SemanticMatches, 44 ConstructedPredicates, 1 IntricatePredicates, 1 DeprecatedPredicates, 410 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=180, Invalid=1803, Unknown=1, NotChecked=86, Total=2070 [2021-11-25 17:56:01,303 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 35 mSDsluCounter, 150 mSDsCounter, 0 mSdLazyCounter, 231 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 132 SdHoareTripleChecker+Invalid, 284 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 231 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 44 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 17:56:01,303 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [35 Valid, 132 Invalid, 284 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 231 Invalid, 0 Unknown, 44 Unchecked, 0.1s Time] [2021-11-25 17:56:01,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2021-11-25 17:56:01,305 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 69. [2021-11-25 17:56:01,305 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 67 states have (on average 1.1791044776119404) internal successors, (79), 68 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:56:01,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 79 transitions. [2021-11-25 17:56:01,305 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 79 transitions. Word has length 25 [2021-11-25 17:56:01,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:56:01,306 INFO L470 AbstractCegarLoop]: Abstraction has 69 states and 79 transitions. [2021-11-25 17:56:01,306 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:56:01,306 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 79 transitions. [2021-11-25 17:56:01,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-25 17:56:01,307 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:56:01,307 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:56:01,336 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-25 17:56:01,523 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:56:01,524 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-25 17:56:01,524 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:56:01,524 INFO L85 PathProgramCache]: Analyzing trace with hash -594383901, now seen corresponding path program 2 times [2021-11-25 17:56:01,524 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:56:01,524 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [202824523] [2021-11-25 17:56:01,524 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:56:01,524 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:56:01,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:56:01,744 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 17:56:01,744 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:56:01,744 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [202824523] [2021-11-25 17:56:01,745 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [202824523] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 17:56:01,745 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1154204240] [2021-11-25 17:56:01,745 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 17:56:01,745 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:56:01,745 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:56:01,746 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:56:01,746 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-25 17:56:01,830 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-25 17:56:01,830 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 17:56:01,832 INFO L263 TraceCheckSpWp]: Trace formula consists of 204 conjuncts, 42 conjunts are in the unsatisfiable core [2021-11-25 17:56:01,838 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:56:01,921 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:56:02,068 INFO L354 Elim1Store]: treesize reduction 8, result has 27.3 percent of original size [2021-11-25 17:56:02,068 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 10 [2021-11-25 17:56:02,074 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 17:56:02,074 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:56:02,162 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-25 17:56:02,164 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-11-25 17:56:02,253 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 17:56:02,253 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1154204240] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:56:02,254 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1477206723] [2021-11-25 17:56:02,255 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 17:56:02,256 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 17:56:02,256 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 17:56:02,256 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 17:56:02,256 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 17:56:02,297 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:56:02,298 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 17:56:02,324 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 17:56:02,358 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:56:02,382 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 17:56:02,434 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-25 17:56:02,434 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 87 treesize of output 86 [2021-11-25 17:56:02,482 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:56:02,503 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:56:02,596 INFO L354 Elim1Store]: treesize reduction 28, result has 44.0 percent of original size [2021-11-25 17:56:02,596 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 175 treesize of output 179 [2021-11-25 17:56:02,782 INFO L354 Elim1Store]: treesize reduction 68, result has 37.6 percent of original size [2021-11-25 17:56:02,783 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 192 treesize of output 207 [2021-11-25 17:56:03,795 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 17:56:06,498 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2795#(and (<= 0 |ULTIMATE.start_cstrpbrk_~scanp~0#1.base|) (<= |ULTIMATE.start_cstrpbrk_~s2#1.offset| 0) (<= 1 |ULTIMATE.start_cstrpbrk_~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrpbrk_~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrpbrk_~scanp~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cstrpbrk_#in~s2#1.offset| 0) (<= |ULTIMATE.start_cstrpbrk_#in~s1#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrpbrk_#in~s1#1.base|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrpbrk_#t~post4#1.offset|) (<= 0 |ULTIMATE.start_cstrpbrk_~s1#1.base|) (<= 0 |ULTIMATE.start_cstrpbrk_#in~s2#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrpbrk_~s1#1.offset| 1) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (= |ULTIMATE.start_main_#t~malloc9#1.offset| 0) (<= 0 |ULTIMATE.start_cstrpbrk_~s2#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrpbrk_#in~s2#1.offset|) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (< (select |#length| |ULTIMATE.start_cstrpbrk_#t~post4#1.base|) (+ |ULTIMATE.start_cstrpbrk_#t~post4#1.offset| 1)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc9#1.base|) (<= 0 |ULTIMATE.start_cstrpbrk_#t~post4#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 0 |ULTIMATE.start_cstrpbrk_#in~s1#1.offset|) (= |#NULL.base| 0))' at error location [2021-11-25 17:56:06,498 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 17:56:06,498 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 17:56:06,498 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 29 [2021-11-25 17:56:06,498 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1530972411] [2021-11-25 17:56:06,498 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 17:56:06,499 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-25 17:56:06,499 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:56:06,499 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-25 17:56:06,500 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=1633, Unknown=0, NotChecked=0, Total=1806 [2021-11-25 17:56:06,500 INFO L87 Difference]: Start difference. First operand 69 states and 79 transitions. Second operand has 29 states, 29 states have (on average 1.9655172413793103) internal successors, (57), 29 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:56:07,073 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:56:07,073 INFO L93 Difference]: Finished difference Result 128 states and 142 transitions. [2021-11-25 17:56:07,073 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-25 17:56:07,073 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.9655172413793103) internal successors, (57), 29 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2021-11-25 17:56:07,074 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:56:07,074 INFO L225 Difference]: With dead ends: 128 [2021-11-25 17:56:07,074 INFO L226 Difference]: Without dead ends: 116 [2021-11-25 17:56:07,076 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 46 SyntacticMatches, 2 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 4 DeprecatedPredicates, 1012 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=402, Invalid=3138, Unknown=0, NotChecked=0, Total=3540 [2021-11-25 17:56:07,076 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 197 mSDsluCounter, 250 mSDsCounter, 0 mSdLazyCounter, 323 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 197 SdHoareTripleChecker+Valid, 229 SdHoareTripleChecker+Invalid, 378 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 323 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 25 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 17:56:07,077 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [197 Valid, 229 Invalid, 378 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 323 Invalid, 0 Unknown, 25 Unchecked, 0.2s Time] [2021-11-25 17:56:07,077 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2021-11-25 17:56:07,080 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 82. [2021-11-25 17:56:07,080 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 80 states have (on average 1.175) internal successors, (94), 81 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:56:07,081 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 94 transitions. [2021-11-25 17:56:07,081 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 94 transitions. Word has length 26 [2021-11-25 17:56:07,081 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:56:07,081 INFO L470 AbstractCegarLoop]: Abstraction has 82 states and 94 transitions. [2021-11-25 17:56:07,081 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.9655172413793103) internal successors, (57), 29 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:56:07,081 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 94 transitions. [2021-11-25 17:56:07,082 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-25 17:56:07,082 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:56:07,082 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:56:07,122 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-25 17:56:07,283 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:56:07,283 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-25 17:56:07,283 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:56:07,284 INFO L85 PathProgramCache]: Analyzing trace with hash -1071901199, now seen corresponding path program 4 times [2021-11-25 17:56:07,284 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:56:07,284 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1896865106] [2021-11-25 17:56:07,284 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:56:07,284 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:56:07,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:56:07,392 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 6 proven. 13 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 17:56:07,392 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:56:07,393 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1896865106] [2021-11-25 17:56:07,393 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1896865106] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 17:56:07,393 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1660516350] [2021-11-25 17:56:07,393 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 17:56:07,393 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:56:07,393 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:56:07,394 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:56:07,395 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-25 17:56:07,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:56:07,479 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 33 conjunts are in the unsatisfiable core [2021-11-25 17:56:07,480 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:56:07,593 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 6 proven. 13 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 17:56:07,594 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:56:07,768 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2021-11-25 17:56:07,780 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 6 proven. 13 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 17:56:07,780 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1660516350] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:56:07,780 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1282811766] [2021-11-25 17:56:07,782 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 17:56:07,782 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 17:56:07,782 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 17:56:07,783 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 17:56:07,783 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 17:56:07,813 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:56:07,815 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 17:56:07,844 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 17:56:07,873 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:56:07,904 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:56:07,955 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:56:07,956 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 91 treesize of output 83 [2021-11-25 17:56:08,003 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:56:08,052 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:56:08,098 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:56:08,146 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 17:56:08,146 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 17:56:09,154 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 17:56:12,069 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3227#(and (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (< (select |#length| |ULTIMATE.start_cstrpbrk_#t~post2#1.base|) (+ |ULTIMATE.start_cstrpbrk_#t~post2#1.offset| 1)) (= |ULTIMATE.start_main_#t~malloc9#1.offset| 0) (or (and (<= 0 |ULTIMATE.start_cstrpbrk_~scanp~0#1.base|) (<= |ULTIMATE.start_cstrpbrk_~s2#1.offset| 0) (<= 0 |ULTIMATE.start_cstrpbrk_~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrpbrk_~scanp~0#1.offset|) (<= |ULTIMATE.start_cstrpbrk_#in~s2#1.offset| 0) (<= |ULTIMATE.start_cstrpbrk_#in~s1#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrpbrk_#in~s1#1.base|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrpbrk_~sc~0#1|) (<= 0 |ULTIMATE.start_cstrpbrk_~s1#1.base|) (<= 0 |ULTIMATE.start_cstrpbrk_#in~s2#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrpbrk_~sc~0#1| 0) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 |ULTIMATE.start_cstrpbrk_~s2#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrpbrk_#in~s2#1.offset|) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc9#1.base|) (<= 1 |ULTIMATE.start_cstrpbrk_#t~post2#1.offset|) (<= |ULTIMATE.start_cstrpbrk_~scanp~0#1.offset| 1) (<= 0 |ULTIMATE.start_cstrpbrk_#t~post2#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 2 |ULTIMATE.start_cstrpbrk_~s1#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 0 |ULTIMATE.start_cstrpbrk_#in~s1#1.offset|)) (and (<= |ULTIMATE.start_cstrpbrk_~s2#1.offset| 0) (<= 1 |ULTIMATE.start_cstrpbrk_~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrpbrk_~s2#1.offset|) (<= |ULTIMATE.start_cstrpbrk_#in~s2#1.offset| 0) (<= |ULTIMATE.start_cstrpbrk_#in~s1#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrpbrk_#in~s1#1.base|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_cstrpbrk_#t~post2#1.offset| 0) (<= 0 |ULTIMATE.start_cstrpbrk_~s1#1.base|) (<= 0 |ULTIMATE.start_cstrpbrk_#in~s2#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrpbrk_~s1#1.offset| 1) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 |ULTIMATE.start_cstrpbrk_~s2#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrpbrk_#in~s2#1.offset|) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrpbrk_#t~post2#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc9#1.base|) (<= 0 |ULTIMATE.start_cstrpbrk_#t~post2#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 0 |ULTIMATE.start_cstrpbrk_#in~s1#1.offset|))) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2021-11-25 17:56:12,069 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 17:56:12,069 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 17:56:12,069 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 16 [2021-11-25 17:56:12,069 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1767816528] [2021-11-25 17:56:12,069 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 17:56:12,070 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-25 17:56:12,070 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:56:12,070 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-25 17:56:12,070 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=807, Unknown=0, NotChecked=0, Total=930 [2021-11-25 17:56:12,071 INFO L87 Difference]: Start difference. First operand 82 states and 94 transitions. Second operand has 18 states, 17 states have (on average 2.9411764705882355) internal successors, (50), 17 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:56:12,341 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:56:12,341 INFO L93 Difference]: Finished difference Result 96 states and 107 transitions. [2021-11-25 17:56:12,342 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-25 17:56:12,342 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 2.9411764705882355) internal successors, (50), 17 states have internal predecessors, (50), 0 states have call successors, (0), 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 27 [2021-11-25 17:56:12,342 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:56:12,343 INFO L225 Difference]: With dead ends: 96 [2021-11-25 17:56:12,343 INFO L226 Difference]: Without dead ends: 96 [2021-11-25 17:56:12,344 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 295 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=234, Invalid=1406, Unknown=0, NotChecked=0, Total=1640 [2021-11-25 17:56:12,344 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 159 mSDsluCounter, 89 mSDsCounter, 0 mSdLazyCounter, 223 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 159 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 237 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 223 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 17:56:12,345 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [159 Valid, 98 Invalid, 237 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 223 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 17:56:12,345 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2021-11-25 17:56:12,348 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 91. [2021-11-25 17:56:12,348 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 89 states have (on average 1.1797752808988764) internal successors, (105), 90 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:56:12,349 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 105 transitions. [2021-11-25 17:56:12,349 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 105 transitions. Word has length 27 [2021-11-25 17:56:12,349 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:56:12,349 INFO L470 AbstractCegarLoop]: Abstraction has 91 states and 105 transitions. [2021-11-25 17:56:12,350 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 2.9411764705882355) internal successors, (50), 17 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:56:12,350 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 105 transitions. [2021-11-25 17:56:12,351 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-25 17:56:12,351 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:56:12,351 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:56:12,372 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-25 17:56:12,555 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:56:12,556 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-25 17:56:12,556 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:56:12,556 INFO L85 PathProgramCache]: Analyzing trace with hash -806177142, now seen corresponding path program 3 times [2021-11-25 17:56:12,556 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:56:12,556 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [162485883] [2021-11-25 17:56:12,557 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:56:12,557 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:56:12,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:56:12,769 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 1 proven. 16 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 17:56:12,770 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:56:12,770 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [162485883] [2021-11-25 17:56:12,770 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [162485883] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 17:56:12,770 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1327833210] [2021-11-25 17:56:12,770 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 17:56:12,771 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:56:12,771 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:56:12,772 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:56:12,794 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-25 17:56:12,860 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 17:56:12,861 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 17:56:12,862 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-25 17:56:12,863 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:56:13,018 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 6 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 17:56:13,018 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:56:13,198 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2021-11-25 17:56:13,215 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 6 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 17:56:13,215 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1327833210] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:56:13,215 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [474453999] [2021-11-25 17:56:13,217 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 17:56:13,217 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 17:56:13,217 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 17:56:13,217 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 17:56:13,218 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 17:56:13,245 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:56:13,246 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 17:56:13,275 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 17:56:13,315 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:56:13,347 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 17:56:13,412 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-25 17:56:13,413 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 87 treesize of output 86 [2021-11-25 17:56:13,480 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:56:13,508 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:56:13,615 INFO L354 Elim1Store]: treesize reduction 28, result has 44.0 percent of original size [2021-11-25 17:56:13,615 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 175 treesize of output 179 [2021-11-25 17:56:13,823 INFO L354 Elim1Store]: treesize reduction 68, result has 37.6 percent of original size [2021-11-25 17:56:13,823 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 324 treesize of output 339 [2021-11-25 17:56:15,164 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 17:56:18,135 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3636#(and (<= 0 |ULTIMATE.start_cstrpbrk_~scanp~0#1.base|) (<= |ULTIMATE.start_cstrpbrk_~s2#1.offset| 0) (<= 1 |ULTIMATE.start_cstrpbrk_~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrpbrk_~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrpbrk_~scanp~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cstrpbrk_#in~s2#1.offset| 0) (<= |ULTIMATE.start_cstrpbrk_#in~s1#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrpbrk_#in~s1#1.base|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrpbrk_#t~post4#1.offset|) (<= 0 |ULTIMATE.start_cstrpbrk_~s1#1.base|) (<= 0 |ULTIMATE.start_cstrpbrk_#in~s2#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrpbrk_~s1#1.offset| 1) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (= |ULTIMATE.start_main_#t~malloc9#1.offset| 0) (<= 0 |ULTIMATE.start_cstrpbrk_~s2#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrpbrk_#in~s2#1.offset|) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (< (select |#length| |ULTIMATE.start_cstrpbrk_#t~post4#1.base|) (+ |ULTIMATE.start_cstrpbrk_#t~post4#1.offset| 1)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc9#1.base|) (<= 0 |ULTIMATE.start_cstrpbrk_#t~post4#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 0 |ULTIMATE.start_cstrpbrk_#in~s1#1.offset|) (= |#NULL.base| 0))' at error location [2021-11-25 17:56:18,135 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 17:56:18,135 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 17:56:18,135 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 26 [2021-11-25 17:56:18,135 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1314172544] [2021-11-25 17:56:18,136 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 17:56:18,136 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-25 17:56:18,136 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:56:18,136 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-25 17:56:18,137 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=1469, Unknown=0, NotChecked=0, Total=1640 [2021-11-25 17:56:18,137 INFO L87 Difference]: Start difference. First operand 91 states and 105 transitions. Second operand has 27 states, 26 states have (on average 2.3461538461538463) internal successors, (61), 27 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:56:18,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:56:18,604 INFO L93 Difference]: Finished difference Result 184 states and 212 transitions. [2021-11-25 17:56:18,606 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-25 17:56:18,606 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 26 states have (on average 2.3461538461538463) internal successors, (61), 27 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 28 [2021-11-25 17:56:18,607 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:56:18,608 INFO L225 Difference]: With dead ends: 184 [2021-11-25 17:56:18,608 INFO L226 Difference]: Without dead ends: 184 [2021-11-25 17:56:18,609 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 656 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=364, Invalid=2288, Unknown=0, NotChecked=0, Total=2652 [2021-11-25 17:56:18,610 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 204 mSDsluCounter, 156 mSDsCounter, 0 mSdLazyCounter, 453 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 204 SdHoareTripleChecker+Valid, 163 SdHoareTripleChecker+Invalid, 483 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 453 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 17:56:18,610 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [204 Valid, 163 Invalid, 483 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 453 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 17:56:18,610 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2021-11-25 17:56:18,614 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 135. [2021-11-25 17:56:18,615 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 135 states, 133 states have (on average 1.1954887218045114) internal successors, (159), 134 states have internal predecessors, (159), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:56:18,615 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 159 transitions. [2021-11-25 17:56:18,615 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 159 transitions. Word has length 28 [2021-11-25 17:56:18,616 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:56:18,616 INFO L470 AbstractCegarLoop]: Abstraction has 135 states and 159 transitions. [2021-11-25 17:56:18,616 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 26 states have (on average 2.3461538461538463) internal successors, (61), 27 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:56:18,616 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 159 transitions. [2021-11-25 17:56:18,617 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-25 17:56:18,617 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:56:18,617 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:56:18,649 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-25 17:56:18,831 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-11-25 17:56:18,832 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-25 17:56:18,832 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:56:18,832 INFO L85 PathProgramCache]: Analyzing trace with hash 1130887116, now seen corresponding path program 1 times [2021-11-25 17:56:18,832 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:56:18,832 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1734812026] [2021-11-25 17:56:18,832 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:56:18,832 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:56:18,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:56:18,903 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 7 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 17:56:18,904 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:56:18,904 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1734812026] [2021-11-25 17:56:18,904 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1734812026] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 17:56:18,904 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1235271123] [2021-11-25 17:56:18,904 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:56:18,904 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:56:18,905 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:56:18,905 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:56:18,930 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-25 17:56:18,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:56:18,999 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-25 17:56:19,001 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:56:19,065 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:56:19,110 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-11-25 17:56:19,116 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 4 proven. 4 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 17:56:19,116 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:56:19,144 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 11 [2021-11-25 17:56:19,147 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 18 [2021-11-25 17:56:19,221 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 4 proven. 4 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 17:56:19,221 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1235271123] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:56:19,221 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1565453405] [2021-11-25 17:56:19,223 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 17:56:19,223 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 17:56:19,224 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 17:56:19,224 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 17:56:19,224 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 17:56:19,264 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:56:19,265 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 17:56:19,294 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:56:19,330 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:56:19,366 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:56:19,408 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:56:19,408 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 91 treesize of output 83 [2021-11-25 17:56:19,454 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:56:19,488 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:56:19,544 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:56:19,602 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 17:56:19,602 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 17:56:20,689 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 17:56:22,939 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4168#(and (<= 0 |ULTIMATE.start_cstrpbrk_~scanp~0#1.base|) (<= |ULTIMATE.start_cstrpbrk_~s2#1.offset| 0) (<= 1 |ULTIMATE.start_cstrpbrk_~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrpbrk_~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrpbrk_~scanp~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cstrpbrk_#in~s2#1.offset| 0) (<= |ULTIMATE.start_cstrpbrk_#in~s1#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrpbrk_#in~s1#1.base|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrpbrk_#t~post4#1.offset|) (<= 0 |ULTIMATE.start_cstrpbrk_~s1#1.base|) (<= 0 |ULTIMATE.start_cstrpbrk_#in~s2#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (= |ULTIMATE.start_main_#t~malloc9#1.offset| 0) (<= 0 |ULTIMATE.start_cstrpbrk_~s2#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrpbrk_#in~s2#1.offset|) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (< (select |#length| |ULTIMATE.start_cstrpbrk_#t~post4#1.base|) (+ |ULTIMATE.start_cstrpbrk_#t~post4#1.offset| 1)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc9#1.base|) (<= 0 |ULTIMATE.start_cstrpbrk_#t~post4#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 0 |ULTIMATE.start_cstrpbrk_#in~s1#1.offset|) (= |#NULL.base| 0))' at error location [2021-11-25 17:56:22,939 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 17:56:22,939 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 17:56:22,940 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10, 10] total 15 [2021-11-25 17:56:22,940 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1463650908] [2021-11-25 17:56:22,940 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 17:56:22,940 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-25 17:56:22,940 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:56:22,941 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-25 17:56:22,941 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=710, Unknown=0, NotChecked=0, Total=812 [2021-11-25 17:56:22,941 INFO L87 Difference]: Start difference. First operand 135 states and 159 transitions. Second operand has 15 states, 15 states have (on average 2.466666666666667) internal successors, (37), 15 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:56:23,309 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:56:23,309 INFO L93 Difference]: Finished difference Result 191 states and 219 transitions. [2021-11-25 17:56:23,310 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-25 17:56:23,310 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.466666666666667) internal successors, (37), 15 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2021-11-25 17:56:23,310 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:56:23,311 INFO L225 Difference]: With dead ends: 191 [2021-11-25 17:56:23,311 INFO L226 Difference]: Without dead ends: 191 [2021-11-25 17:56:23,312 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 63 SyntacticMatches, 3 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 353 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=223, Invalid=1499, Unknown=0, NotChecked=0, Total=1722 [2021-11-25 17:56:23,313 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 52 mSDsluCounter, 93 mSDsCounter, 0 mSdLazyCounter, 227 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 79 SdHoareTripleChecker+Invalid, 247 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 227 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 17:56:23,313 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [52 Valid, 79 Invalid, 247 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 227 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 17:56:23,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 191 states. [2021-11-25 17:56:23,317 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 191 to 154. [2021-11-25 17:56:23,318 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 154 states, 152 states have (on average 1.1907894736842106) internal successors, (181), 153 states have internal predecessors, (181), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:56:23,318 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 181 transitions. [2021-11-25 17:56:23,319 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 181 transitions. Word has length 28 [2021-11-25 17:56:23,319 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:56:23,319 INFO L470 AbstractCegarLoop]: Abstraction has 154 states and 181 transitions. [2021-11-25 17:56:23,319 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 2.466666666666667) internal successors, (37), 15 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:56:23,319 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 181 transitions. [2021-11-25 17:56:23,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-25 17:56:23,320 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:56:23,320 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:56:23,354 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-25 17:56:23,535 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-11-25 17:56:23,536 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-25 17:56:23,536 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:56:23,536 INFO L85 PathProgramCache]: Analyzing trace with hash -1794201264, now seen corresponding path program 4 times [2021-11-25 17:56:23,536 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:56:23,536 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1964479614] [2021-11-25 17:56:23,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:56:23,536 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:56:23,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:56:23,891 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 12 proven. 19 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 17:56:23,891 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:56:23,891 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1964479614] [2021-11-25 17:56:23,892 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1964479614] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 17:56:23,892 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [537427555] [2021-11-25 17:56:23,892 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 17:56:23,892 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:56:23,892 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:56:23,893 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:56:23,909 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-25 17:56:23,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:56:23,994 INFO L263 TraceCheckSpWp]: Trace formula consists of 235 conjuncts, 51 conjunts are in the unsatisfiable core [2021-11-25 17:56:23,996 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:56:24,157 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:56:24,647 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 17:56:24,648 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 17:56:24,649 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 10 [2021-11-25 17:56:24,655 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 8 proven. 19 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 17:56:24,655 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:56:24,802 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-25 17:56:24,804 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-11-25 17:56:25,078 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 8 proven. 19 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 17:56:25,078 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [537427555] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:56:25,078 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [682399078] [2021-11-25 17:56:25,080 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 17:56:25,080 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 17:56:25,080 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 17:56:25,080 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 17:56:25,080 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 17:56:25,103 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:56:25,103 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 17:56:25,136 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:56:25,165 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:56:25,188 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 17:56:25,238 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-25 17:56:25,238 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 87 treesize of output 86 [2021-11-25 17:56:25,281 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:56:25,303 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:56:25,397 INFO L354 Elim1Store]: treesize reduction 28, result has 44.0 percent of original size [2021-11-25 17:56:25,398 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 175 treesize of output 179 [2021-11-25 17:56:25,508 INFO L354 Elim1Store]: treesize reduction 68, result has 37.6 percent of original size [2021-11-25 17:56:25,508 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 193 treesize of output 208 [2021-11-25 17:56:26,092 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 17:56:29,059 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4782#(and (<= 0 |ULTIMATE.start_cstrpbrk_~scanp~0#1.base|) (<= |ULTIMATE.start_cstrpbrk_~s2#1.offset| 0) (<= 1 |ULTIMATE.start_cstrpbrk_~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrpbrk_~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrpbrk_~scanp~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cstrpbrk_#in~s2#1.offset| 0) (<= |ULTIMATE.start_cstrpbrk_#in~s1#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrpbrk_#in~s1#1.base|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrpbrk_#t~post4#1.offset|) (<= 0 |ULTIMATE.start_cstrpbrk_~s1#1.base|) (<= 0 |ULTIMATE.start_cstrpbrk_#in~s2#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrpbrk_~s1#1.offset| 1) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (= |ULTIMATE.start_main_#t~malloc9#1.offset| 0) (<= 0 |ULTIMATE.start_cstrpbrk_~s2#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrpbrk_#in~s2#1.offset|) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (< (select |#length| |ULTIMATE.start_cstrpbrk_#t~post4#1.base|) (+ |ULTIMATE.start_cstrpbrk_#t~post4#1.offset| 1)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc9#1.base|) (<= 0 |ULTIMATE.start_cstrpbrk_#t~post4#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 0 |ULTIMATE.start_cstrpbrk_#in~s1#1.offset|) (= |#NULL.base| 0))' at error location [2021-11-25 17:56:29,059 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 17:56:29,059 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 17:56:29,059 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 15, 15] total 40 [2021-11-25 17:56:29,059 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1642987925] [2021-11-25 17:56:29,059 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 17:56:29,060 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2021-11-25 17:56:29,060 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:56:29,060 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-11-25 17:56:29,061 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=273, Invalid=2697, Unknown=0, NotChecked=0, Total=2970 [2021-11-25 17:56:29,061 INFO L87 Difference]: Start difference. First operand 154 states and 181 transitions. Second operand has 41 states, 41 states have (on average 1.7804878048780488) internal successors, (73), 40 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:56:30,410 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:56:30,410 INFO L93 Difference]: Finished difference Result 240 states and 269 transitions. [2021-11-25 17:56:30,411 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-25 17:56:30,411 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.7804878048780488) internal successors, (73), 40 states have internal predecessors, (73), 0 states have call successors, (0), 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 32 [2021-11-25 17:56:30,411 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:56:30,412 INFO L225 Difference]: With dead ends: 240 [2021-11-25 17:56:30,412 INFO L226 Difference]: Without dead ends: 224 [2021-11-25 17:56:30,414 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 60 SyntacticMatches, 1 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1628 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=626, Invalid=5380, Unknown=0, NotChecked=0, Total=6006 [2021-11-25 17:56:30,414 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 265 mSDsluCounter, 422 mSDsCounter, 0 mSdLazyCounter, 463 mSolverCounterSat, 52 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 265 SdHoareTripleChecker+Valid, 403 SdHoareTripleChecker+Invalid, 843 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 52 IncrementalHoareTripleChecker+Valid, 463 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 328 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 17:56:30,415 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [265 Valid, 403 Invalid, 843 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [52 Valid, 463 Invalid, 0 Unknown, 328 Unchecked, 0.3s Time] [2021-11-25 17:56:30,415 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 224 states. [2021-11-25 17:56:30,419 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 224 to 174. [2021-11-25 17:56:30,419 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 174 states, 172 states have (on average 1.186046511627907) internal successors, (204), 173 states have internal predecessors, (204), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:56:30,420 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 204 transitions. [2021-11-25 17:56:30,420 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 204 transitions. Word has length 32 [2021-11-25 17:56:30,420 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:56:30,421 INFO L470 AbstractCegarLoop]: Abstraction has 174 states and 204 transitions. [2021-11-25 17:56:30,421 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 1.7804878048780488) internal successors, (73), 40 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:56:30,421 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 204 transitions. [2021-11-25 17:56:30,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-11-25 17:56:30,422 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:56:30,422 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:56:30,454 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-25 17:56:30,647 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:56:30,648 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-25 17:56:30,648 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:56:30,648 INFO L85 PathProgramCache]: Analyzing trace with hash -518986457, now seen corresponding path program 5 times [2021-11-25 17:56:30,648 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:56:30,648 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [204930372] [2021-11-25 17:56:30,648 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:56:30,648 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:56:30,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:56:30,942 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 12 proven. 21 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 17:56:30,942 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:56:30,942 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [204930372] [2021-11-25 17:56:30,942 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [204930372] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 17:56:30,943 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1633186412] [2021-11-25 17:56:30,943 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 17:56:30,943 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:56:30,943 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:56:30,948 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:56:30,964 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-25 17:56:31,064 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-25 17:56:31,064 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 17:56:31,066 INFO L263 TraceCheckSpWp]: Trace formula consists of 264 conjuncts, 60 conjunts are in the unsatisfiable core [2021-11-25 17:56:31,068 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:56:31,078 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 17:56:31,268 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:56:31,307 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 19 [2021-11-25 17:56:31,912 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:56:31,912 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 17:56:31,914 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 17:56:31,914 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 28 treesize of output 14 [2021-11-25 17:56:31,923 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 12 proven. 21 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 17:56:31,923 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:56:32,111 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_569 (Array Int Int)) (|v_ULTIMATE.start_cstrpbrk_#t~post2#1.offset_93| Int)) (let ((.cse0 (select (store |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base| v_ArrVal_569) |c_ULTIMATE.start_main_~nondetString1~0#1.base|))) (or (= (select .cse0 (+ |v_ULTIMATE.start_cstrpbrk_#t~post2#1.offset_93| 2)) 0) (= (select .cse0 (+ |v_ULTIMATE.start_cstrpbrk_#t~post2#1.offset_93| 1)) 0) (< |c_ULTIMATE.start_main_~nondetString1~0#1.offset| |v_ULTIMATE.start_cstrpbrk_#t~post2#1.offset_93|) (< |v_ULTIMATE.start_cstrpbrk_#t~post2#1.offset_93| 0)))) is different from false [2021-11-25 17:56:32,120 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 17:56:32,120 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 47 treesize of output 36 [2021-11-25 17:56:32,122 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 17:56:32,130 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 17:56:32,130 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 62 treesize of output 69 [2021-11-25 17:56:32,134 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 17:56:32,135 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 15 [2021-11-25 17:56:32,600 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 18 proven. 15 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 17:56:32,600 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1633186412] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:56:32,600 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1296189521] [2021-11-25 17:56:32,601 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 17:56:32,602 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 17:56:32,602 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 17:56:32,602 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 17:56:32,602 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 17:56:32,632 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:56:32,634 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 17:56:32,659 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:56:32,684 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:56:32,719 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:56:32,775 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:56:32,778 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 91 treesize of output 83 [2021-11-25 17:56:32,822 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:56:32,856 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:56:32,888 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:56:32,931 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 17:56:32,932 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 17:56:33,755 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 17:56:36,773 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5490#(and (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (< (select |#length| |ULTIMATE.start_cstrpbrk_#t~post2#1.base|) (+ |ULTIMATE.start_cstrpbrk_#t~post2#1.offset| 1)) (= |ULTIMATE.start_main_#t~malloc9#1.offset| 0) (or (and (<= 0 |ULTIMATE.start_cstrpbrk_~scanp~0#1.base|) (<= |ULTIMATE.start_cstrpbrk_~s2#1.offset| 0) (<= 0 |ULTIMATE.start_cstrpbrk_~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrpbrk_~scanp~0#1.offset|) (<= |ULTIMATE.start_cstrpbrk_#in~s2#1.offset| 0) (<= |ULTIMATE.start_cstrpbrk_#in~s1#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrpbrk_#in~s1#1.base|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrpbrk_~sc~0#1|) (<= 0 |ULTIMATE.start_cstrpbrk_~s1#1.base|) (<= 0 |ULTIMATE.start_cstrpbrk_#in~s2#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrpbrk_~sc~0#1| 0) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 |ULTIMATE.start_cstrpbrk_~s2#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrpbrk_#in~s2#1.offset|) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc9#1.base|) (<= 1 |ULTIMATE.start_cstrpbrk_#t~post2#1.offset|) (<= |ULTIMATE.start_cstrpbrk_~scanp~0#1.offset| 1) (<= 0 |ULTIMATE.start_cstrpbrk_#t~post2#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 2 |ULTIMATE.start_cstrpbrk_~s1#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 0 |ULTIMATE.start_cstrpbrk_#in~s1#1.offset|)) (and (<= |ULTIMATE.start_cstrpbrk_~s2#1.offset| 0) (<= 1 |ULTIMATE.start_cstrpbrk_~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrpbrk_~s2#1.offset|) (<= |ULTIMATE.start_cstrpbrk_#in~s2#1.offset| 0) (<= |ULTIMATE.start_cstrpbrk_#in~s1#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrpbrk_#in~s1#1.base|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_cstrpbrk_#t~post2#1.offset| 0) (<= 0 |ULTIMATE.start_cstrpbrk_~s1#1.base|) (<= 0 |ULTIMATE.start_cstrpbrk_#in~s2#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrpbrk_~s1#1.offset| 1) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 |ULTIMATE.start_cstrpbrk_~s2#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrpbrk_#in~s2#1.offset|) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrpbrk_#t~post2#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc9#1.base|) (<= 0 |ULTIMATE.start_cstrpbrk_#t~post2#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 0 |ULTIMATE.start_cstrpbrk_#in~s1#1.offset|))) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2021-11-25 17:56:36,773 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 17:56:36,773 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 17:56:36,773 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 16, 16] total 40 [2021-11-25 17:56:36,773 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [814810745] [2021-11-25 17:56:36,773 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 17:56:36,774 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2021-11-25 17:56:36,774 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:56:36,775 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-11-25 17:56:36,775 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=2549, Unknown=1, NotChecked=102, Total=2862 [2021-11-25 17:56:36,776 INFO L87 Difference]: Start difference. First operand 174 states and 204 transitions. Second operand has 41 states, 41 states have (on average 2.0) internal successors, (82), 40 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:56:37,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:56:37,233 INFO L93 Difference]: Finished difference Result 286 states and 329 transitions. [2021-11-25 17:56:37,235 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-25 17:56:37,235 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 2.0) internal successors, (82), 40 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 33 [2021-11-25 17:56:37,235 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:56:37,236 INFO L225 Difference]: With dead ends: 286 [2021-11-25 17:56:37,237 INFO L226 Difference]: Without dead ends: 263 [2021-11-25 17:56:37,238 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 61 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 1080 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=290, Invalid=3495, Unknown=1, NotChecked=120, Total=3906 [2021-11-25 17:56:37,238 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 81 mSDsluCounter, 290 mSDsCounter, 0 mSdLazyCounter, 259 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 81 SdHoareTripleChecker+Valid, 263 SdHoareTripleChecker+Invalid, 349 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 259 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 81 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 17:56:37,238 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [81 Valid, 263 Invalid, 349 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 259 Invalid, 0 Unknown, 81 Unchecked, 0.1s Time] [2021-11-25 17:56:37,239 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 263 states. [2021-11-25 17:56:37,243 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 263 to 235. [2021-11-25 17:56:37,244 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 235 states, 233 states have (on average 1.1716738197424892) internal successors, (273), 234 states have internal predecessors, (273), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:56:37,245 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 235 states to 235 states and 273 transitions. [2021-11-25 17:56:37,245 INFO L78 Accepts]: Start accepts. Automaton has 235 states and 273 transitions. Word has length 33 [2021-11-25 17:56:37,246 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:56:37,246 INFO L470 AbstractCegarLoop]: Abstraction has 235 states and 273 transitions. [2021-11-25 17:56:37,246 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 2.0) internal successors, (82), 40 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:56:37,246 INFO L276 IsEmpty]: Start isEmpty. Operand 235 states and 273 transitions. [2021-11-25 17:56:37,247 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-25 17:56:37,247 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:56:37,247 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:56:37,273 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-25 17:56:37,463 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:56:37,464 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-25 17:56:37,464 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:56:37,464 INFO L85 PathProgramCache]: Analyzing trace with hash -1883235657, now seen corresponding path program 5 times [2021-11-25 17:56:37,464 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:56:37,464 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [328539486] [2021-11-25 17:56:37,464 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:56:37,464 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:56:37,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:56:37,706 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 4 proven. 30 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 17:56:37,706 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:56:37,706 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [328539486] [2021-11-25 17:56:37,706 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [328539486] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 17:56:37,706 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1143652313] [2021-11-25 17:56:37,706 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 17:56:37,707 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:56:37,707 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:56:37,711 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:56:37,730 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-25 17:56:37,829 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-25 17:56:37,830 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 17:56:37,832 INFO L263 TraceCheckSpWp]: Trace formula consists of 235 conjuncts, 45 conjunts are in the unsatisfiable core [2021-11-25 17:56:37,833 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:56:37,848 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 17:56:37,848 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-25 17:56:37,941 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-25 17:56:38,043 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 17:56:38,043 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 21 [2021-11-25 17:56:38,134 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-25 17:56:38,135 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:56:38,503 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-25 17:56:38,507 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-11-25 17:56:38,720 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-25 17:56:38,720 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1143652313] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:56:38,720 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1245255469] [2021-11-25 17:56:38,722 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 17:56:38,722 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 17:56:38,723 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 17:56:38,723 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 17:56:38,723 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 17:56:38,758 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:56:38,761 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 17:56:38,792 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 17:56:38,836 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:56:38,862 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 17:56:38,937 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-25 17:56:38,937 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 87 treesize of output 86 [2021-11-25 17:56:39,015 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:56:39,050 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:56:39,136 INFO L354 Elim1Store]: treesize reduction 28, result has 44.0 percent of original size [2021-11-25 17:56:39,137 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 175 treesize of output 179 [2021-11-25 17:56:39,307 INFO L354 Elim1Store]: treesize reduction 68, result has 37.6 percent of original size [2021-11-25 17:56:39,307 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 324 treesize of output 339 [2021-11-25 17:56:40,662 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 17:56:43,632 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6268#(and (<= 0 |ULTIMATE.start_cstrpbrk_~scanp~0#1.base|) (<= |ULTIMATE.start_cstrpbrk_~s2#1.offset| 0) (<= 1 |ULTIMATE.start_cstrpbrk_~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrpbrk_~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrpbrk_~scanp~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cstrpbrk_#in~s2#1.offset| 0) (<= |ULTIMATE.start_cstrpbrk_#in~s1#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrpbrk_#in~s1#1.base|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrpbrk_#t~post4#1.offset|) (<= 0 |ULTIMATE.start_cstrpbrk_~s1#1.base|) (<= 0 |ULTIMATE.start_cstrpbrk_#in~s2#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrpbrk_~s1#1.offset| 1) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (= |ULTIMATE.start_main_#t~malloc9#1.offset| 0) (<= 0 |ULTIMATE.start_cstrpbrk_~s2#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrpbrk_#in~s2#1.offset|) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (< (select |#length| |ULTIMATE.start_cstrpbrk_#t~post4#1.base|) (+ |ULTIMATE.start_cstrpbrk_#t~post4#1.offset| 1)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc9#1.base|) (<= 0 |ULTIMATE.start_cstrpbrk_#t~post4#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 0 |ULTIMATE.start_cstrpbrk_#in~s1#1.offset|) (= |#NULL.base| 0))' at error location [2021-11-25 17:56:43,632 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 17:56:43,632 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 17:56:43,632 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 7, 7] total 26 [2021-11-25 17:56:43,632 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [907485475] [2021-11-25 17:56:43,632 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 17:56:43,632 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-25 17:56:43,633 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:56:43,633 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-25 17:56:43,634 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=168, Invalid=1554, Unknown=0, NotChecked=0, Total=1722 [2021-11-25 17:56:43,634 INFO L87 Difference]: Start difference. First operand 235 states and 273 transitions. Second operand has 28 states, 27 states have (on average 2.7037037037037037) internal successors, (73), 27 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:56:45,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:56:45,084 INFO L93 Difference]: Finished difference Result 372 states and 414 transitions. [2021-11-25 17:56:45,085 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-11-25 17:56:45,085 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 27 states have (on average 2.7037037037037037) internal successors, (73), 27 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 34 [2021-11-25 17:56:45,085 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:56:45,087 INFO L225 Difference]: With dead ends: 372 [2021-11-25 17:56:45,087 INFO L226 Difference]: Without dead ends: 250 [2021-11-25 17:56:45,089 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 73 SyntacticMatches, 1 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1360 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=957, Invalid=4743, Unknown=0, NotChecked=0, Total=5700 [2021-11-25 17:56:45,090 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 158 mSDsluCounter, 171 mSDsCounter, 0 mSdLazyCounter, 679 mSolverCounterSat, 52 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 158 SdHoareTripleChecker+Valid, 179 SdHoareTripleChecker+Invalid, 785 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 52 IncrementalHoareTripleChecker+Valid, 679 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 54 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 17:56:45,090 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [158 Valid, 179 Invalid, 785 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [52 Valid, 679 Invalid, 0 Unknown, 54 Unchecked, 0.3s Time] [2021-11-25 17:56:45,091 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 250 states. [2021-11-25 17:56:45,094 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 250 to 100. [2021-11-25 17:56:45,094 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 99 states have (on average 1.1616161616161615) internal successors, (115), 99 states have internal predecessors, (115), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:56:45,095 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 115 transitions. [2021-11-25 17:56:45,095 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 115 transitions. Word has length 34 [2021-11-25 17:56:45,095 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:56:45,095 INFO L470 AbstractCegarLoop]: Abstraction has 100 states and 115 transitions. [2021-11-25 17:56:45,096 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 27 states have (on average 2.7037037037037037) internal successors, (73), 27 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:56:45,096 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 115 transitions. [2021-11-25 17:56:45,096 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-25 17:56:45,096 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:56:45,096 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:56:45,117 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-25 17:56:45,299 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-11-25 17:56:45,300 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-25 17:56:45,300 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:56:45,300 INFO L85 PathProgramCache]: Analyzing trace with hash 1739607707, now seen corresponding path program 6 times [2021-11-25 17:56:45,300 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:56:45,300 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [327831626] [2021-11-25 17:56:45,300 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:56:45,300 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:56:45,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:56:45,441 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 12 proven. 28 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 17:56:45,441 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:56:45,441 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [327831626] [2021-11-25 17:56:45,441 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [327831626] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 17:56:45,441 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1992287881] [2021-11-25 17:56:45,441 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 17:56:45,441 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:56:45,442 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:56:45,444 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:56:45,449 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-25 17:56:45,558 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 17:56:45,559 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 17:56:45,560 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 42 conjunts are in the unsatisfiable core [2021-11-25 17:56:45,562 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:56:45,716 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 12 proven. 28 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 17:56:45,716 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:56:45,971 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2021-11-25 17:56:45,988 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 12 proven. 28 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 17:56:45,988 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1992287881] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:56:45,988 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1470365451] [2021-11-25 17:56:45,990 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 17:56:45,990 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 17:56:45,990 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 17:56:45,990 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 17:56:45,990 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 17:56:46,012 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:56:46,012 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 17:56:46,052 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 17:56:46,075 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:56:46,101 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 17:56:46,149 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-25 17:56:46,150 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 87 treesize of output 86 [2021-11-25 17:56:46,197 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:56:46,219 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:56:46,309 INFO L354 Elim1Store]: treesize reduction 28, result has 44.0 percent of original size [2021-11-25 17:56:46,309 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 175 treesize of output 179 [2021-11-25 17:56:46,432 INFO L354 Elim1Store]: treesize reduction 68, result has 37.6 percent of original size [2021-11-25 17:56:46,432 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 193 treesize of output 208 [2021-11-25 17:56:47,145 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 17:56:48,750 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7048#(and (<= |ULTIMATE.start_cstrpbrk_~s2#1.offset| 0) (<= 1 |ULTIMATE.start_cstrpbrk_~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrpbrk_~s2#1.offset|) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cstrpbrk_#in~s2#1.offset| 0) (<= |ULTIMATE.start_cstrpbrk_#in~s1#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrpbrk_#in~s1#1.base|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (< (select |#length| |ULTIMATE.start_cstrpbrk_#t~post2#1.base|) (+ |ULTIMATE.start_cstrpbrk_#t~post2#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrpbrk_~s1#1.base|) (<= 0 |ULTIMATE.start_cstrpbrk_#in~s2#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (= |ULTIMATE.start_main_#t~malloc9#1.offset| 0) (<= 0 |ULTIMATE.start_cstrpbrk_~s2#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrpbrk_#in~s2#1.offset|) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrpbrk_#t~post2#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc9#1.base|) (<= 0 |ULTIMATE.start_cstrpbrk_#t~post2#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 0 |ULTIMATE.start_cstrpbrk_#in~s1#1.offset|) (= |#NULL.base| 0))' at error location [2021-11-25 17:56:48,750 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 17:56:48,750 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 17:56:48,751 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 19 [2021-11-25 17:56:48,751 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1349355268] [2021-11-25 17:56:48,751 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 17:56:48,751 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-11-25 17:56:48,751 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:56:48,752 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-11-25 17:56:48,752 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=133, Invalid=989, Unknown=0, NotChecked=0, Total=1122 [2021-11-25 17:56:48,753 INFO L87 Difference]: Start difference. First operand 100 states and 115 transitions. Second operand has 21 states, 20 states have (on average 3.2) internal successors, (64), 20 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:56:49,092 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:56:49,092 INFO L93 Difference]: Finished difference Result 119 states and 136 transitions. [2021-11-25 17:56:49,093 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-25 17:56:49,093 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 3.2) internal successors, (64), 20 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 35 [2021-11-25 17:56:49,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:56:49,093 INFO L225 Difference]: With dead ends: 119 [2021-11-25 17:56:49,094 INFO L226 Difference]: Without dead ends: 119 [2021-11-25 17:56:49,095 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 82 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 370 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=272, Invalid=1708, Unknown=0, NotChecked=0, Total=1980 [2021-11-25 17:56:49,095 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 168 mSDsluCounter, 130 mSDsCounter, 0 mSdLazyCounter, 311 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 168 SdHoareTripleChecker+Valid, 137 SdHoareTripleChecker+Invalid, 333 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 311 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 17:56:49,096 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [168 Valid, 137 Invalid, 333 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 311 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 17:56:49,096 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2021-11-25 17:56:49,099 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 116. [2021-11-25 17:56:49,099 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 116 states, 115 states have (on average 1.1565217391304348) internal successors, (133), 115 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:56:49,100 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 133 transitions. [2021-11-25 17:56:49,100 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 133 transitions. Word has length 35 [2021-11-25 17:56:49,100 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:56:49,100 INFO L470 AbstractCegarLoop]: Abstraction has 116 states and 133 transitions. [2021-11-25 17:56:49,101 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 20 states have (on average 3.2) internal successors, (64), 20 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:56:49,101 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 133 transitions. [2021-11-25 17:56:49,101 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-25 17:56:49,101 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:56:49,102 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:56:49,128 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2021-11-25 17:56:49,311 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-11-25 17:56:49,312 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-25 17:56:49,312 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:56:49,312 INFO L85 PathProgramCache]: Analyzing trace with hash 125728337, now seen corresponding path program 7 times [2021-11-25 17:56:49,312 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:56:49,313 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1401987729] [2021-11-25 17:56:49,313 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:56:49,313 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:56:49,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:56:49,665 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 17 proven. 43 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 17:56:49,665 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:56:49,666 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1401987729] [2021-11-25 17:56:49,666 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1401987729] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 17:56:49,666 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1368546489] [2021-11-25 17:56:49,666 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 17:56:49,666 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:56:49,666 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:56:49,667 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:56:49,671 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-25 17:56:49,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:56:49,768 INFO L263 TraceCheckSpWp]: Trace formula consists of 316 conjuncts, 78 conjunts are in the unsatisfiable core [2021-11-25 17:56:49,770 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:56:50,091 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:56:50,149 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:56:50,149 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 23 [2021-11-25 17:56:50,943 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:56:50,943 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 17:56:50,944 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 17:56:50,951 INFO L354 Elim1Store]: treesize reduction 4, result has 66.7 percent of original size [2021-11-25 17:56:50,952 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 34 treesize of output 21 [2021-11-25 17:56:50,971 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 17 proven. 44 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 17:56:50,971 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:56:53,126 WARN L838 $PredicateComparison]: unable to prove that (forall ((|ULTIMATE.start_main_~nondetString2~0#1.base| Int)) (let ((.cse0 (select (store |c_#memory_int| |ULTIMATE.start_main_~nondetString2~0#1.base| (store (select |c_#memory_int| |ULTIMATE.start_main_~nondetString2~0#1.base|) (+ (- 1) |c_ULTIMATE.start_main_~nondetString2~0#1.offset| |c_ULTIMATE.start_main_~length2~0#1|) 0)) |c_ULTIMATE.start_main_~nondetString1~0#1.base|))) (or (= (select .cse0 |c_ULTIMATE.start_main_~nondetString1~0#1.offset|) 0) (= (select .cse0 (+ |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 3)) 0)))) is different from false [2021-11-25 17:56:53,141 INFO L354 Elim1Store]: treesize reduction 9, result has 10.0 percent of original size [2021-11-25 17:56:53,141 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 101 treesize of output 91 [2021-11-25 17:56:53,531 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 20 proven. 41 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 17:56:53,532 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1368546489] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:56:53,532 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [318412794] [2021-11-25 17:56:53,533 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 17:56:53,533 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 17:56:53,534 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 17:56:53,534 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 17:56:53,534 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 17:56:53,560 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:56:53,561 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 17:56:53,599 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:56:53,624 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:56:53,654 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 17:56:53,699 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-25 17:56:53,700 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 87 treesize of output 86 [2021-11-25 17:56:53,748 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:56:53,772 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:56:53,856 INFO L354 Elim1Store]: treesize reduction 28, result has 44.0 percent of original size [2021-11-25 17:56:53,857 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 175 treesize of output 179 [2021-11-25 17:56:54,021 INFO L354 Elim1Store]: treesize reduction 68, result has 37.6 percent of original size [2021-11-25 17:56:54,021 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 324 treesize of output 339 [2021-11-25 17:56:54,944 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 17:56:57,034 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7606#(and (<= |ULTIMATE.start_cstrpbrk_~s2#1.offset| 0) (<= 1 |ULTIMATE.start_cstrpbrk_~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrpbrk_~s2#1.offset|) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cstrpbrk_#in~s2#1.offset| 0) (<= |ULTIMATE.start_cstrpbrk_#in~s1#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrpbrk_#in~s1#1.base|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (< (select |#length| |ULTIMATE.start_cstrpbrk_#t~post2#1.base|) (+ |ULTIMATE.start_cstrpbrk_#t~post2#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrpbrk_~s1#1.base|) (<= 0 |ULTIMATE.start_cstrpbrk_#in~s2#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (= |ULTIMATE.start_main_#t~malloc9#1.offset| 0) (<= 0 |ULTIMATE.start_cstrpbrk_~s2#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrpbrk_#in~s2#1.offset|) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrpbrk_#t~post2#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc9#1.base|) (<= 0 |ULTIMATE.start_cstrpbrk_#t~post2#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 0 |ULTIMATE.start_cstrpbrk_#in~s1#1.offset|) (= |#NULL.base| 0))' at error location [2021-11-25 17:56:57,035 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 17:56:57,035 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 17:56:57,035 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 20, 19] total 47 [2021-11-25 17:56:57,035 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [870152067] [2021-11-25 17:56:57,035 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 17:56:57,036 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-25 17:56:57,036 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:56:57,036 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-25 17:56:57,037 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=211, Invalid=3332, Unknown=1, NotChecked=116, Total=3660 [2021-11-25 17:56:57,037 INFO L87 Difference]: Start difference. First operand 116 states and 133 transitions. Second operand has 48 states, 48 states have (on average 1.9583333333333333) internal successors, (94), 47 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:56:58,697 WARN L838 $PredicateComparison]: unable to prove that (let ((.cse0 (< |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 0)) (.cse1 (not (= |c_ULTIMATE.start_main_~nondetString2~0#1.base| |c_ULTIMATE.start_main_~nondetString1~0#1.base|)))) (and (< 0 |c_ULTIMATE.start_main_~length2~0#1|) (= |c_ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (or .cse0 (and .cse1 (= (select (select |c_#memory_int| |c_ULTIMATE.start_main_~nondetString1~0#1.base|) 3) 0))) (exists ((|ULTIMATE.start_main_~length1~0#1| Int)) (and (= (select (select |c_#memory_int| |c_ULTIMATE.start_main_~nondetString1~0#1.base|) (+ (- 1) |c_ULTIMATE.start_main_~nondetString1~0#1.offset| |ULTIMATE.start_main_~length1~0#1|)) 0) (<= |ULTIMATE.start_main_~length1~0#1| 4) (< 3 |ULTIMATE.start_main_~length1~0#1|))) (<= |c_ULTIMATE.start_main_~length1~0#1| 4) (<= |c_ULTIMATE.start_main_~length2~0#1| 1) (or .cse0 (and .cse1 (= 4 (+ |c_ULTIMATE.start_main_~nondetString1~0#1.offset| |c_ULTIMATE.start_main_~length1~0#1|)))) (<= |c_ULTIMATE.start_main_~i~0#1| 4) (<= |c_ULTIMATE.start_main_~i~1#1| 1) (= |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (forall ((|ULTIMATE.start_main_~nondetString2~0#1.base| Int)) (let ((.cse2 (select (store |c_#memory_int| |ULTIMATE.start_main_~nondetString2~0#1.base| (store (select |c_#memory_int| |ULTIMATE.start_main_~nondetString2~0#1.base|) (+ (- 1) |c_ULTIMATE.start_main_~nondetString2~0#1.offset| |c_ULTIMATE.start_main_~length2~0#1|) 0)) |c_ULTIMATE.start_main_~nondetString1~0#1.base|))) (or (= (select .cse2 |c_ULTIMATE.start_main_~nondetString1~0#1.offset|) 0) (= (select .cse2 (+ |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 3)) 0)))) (<= |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (or (and .cse1 (<= 3 |c_ULTIMATE.start_main_~i~0#1|) (<= (+ |c_ULTIMATE.start_main_~nondetString1~0#1.offset| |c_ULTIMATE.start_main_~i~0#1|) 3)) (not (= |c_ULTIMATE.start_main_~length1~0#1| (+ |c_ULTIMATE.start_main_~i~0#1| 1)))) (< 3 |c_ULTIMATE.start_main_~length1~0#1|))) is different from false [2021-11-25 17:57:00,757 WARN L838 $PredicateComparison]: unable to prove that (let ((.cse0 (< |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 0)) (.cse1 (not (= |c_ULTIMATE.start_main_~nondetString2~0#1.base| |c_ULTIMATE.start_main_~nondetString1~0#1.base|)))) (and (= |c_ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (or .cse0 (and .cse1 (= (select (select |c_#memory_int| |c_ULTIMATE.start_main_~nondetString1~0#1.base|) 3) 0))) (or (= |c_ULTIMATE.start_main_~length1~0#1| 1) (= |c_ULTIMATE.start_main_~length1~0#1| 4)) (or .cse0 (and .cse1 (= 4 (+ |c_ULTIMATE.start_main_~nondetString1~0#1.offset| |c_ULTIMATE.start_main_~length1~0#1|)))) (<= |c_ULTIMATE.start_main_~i~0#1| 4) (= |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (forall ((|ULTIMATE.start_main_~nondetString2~0#1.base| Int)) (let ((.cse2 (select (store |c_#memory_int| |ULTIMATE.start_main_~nondetString2~0#1.base| (store (select |c_#memory_int| |ULTIMATE.start_main_~nondetString2~0#1.base|) (+ (- 1) |c_ULTIMATE.start_main_~nondetString2~0#1.offset| |c_ULTIMATE.start_main_~length2~0#1|) 0)) |c_ULTIMATE.start_main_~nondetString1~0#1.base|))) (or (= (select .cse2 |c_ULTIMATE.start_main_~nondetString1~0#1.offset|) 0) (= (select .cse2 (+ |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 3)) 0)))) (<= |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (or (and .cse1 (<= 3 |c_ULTIMATE.start_main_~i~0#1|) (<= (+ |c_ULTIMATE.start_main_~nondetString1~0#1.offset| |c_ULTIMATE.start_main_~i~0#1|) 3)) (not (= |c_ULTIMATE.start_main_~length1~0#1| (+ |c_ULTIMATE.start_main_~i~0#1| 1)))) (< 3 |c_ULTIMATE.start_main_~length1~0#1|))) is different from false [2021-11-25 17:57:00,866 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:57:00,867 INFO L93 Difference]: Finished difference Result 224 states and 253 transitions. [2021-11-25 17:57:00,867 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-25 17:57:00,867 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 1.9583333333333333) internal successors, (94), 47 states have internal predecessors, (94), 0 states have call successors, (0), 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 41 [2021-11-25 17:57:00,867 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:57:00,868 INFO L225 Difference]: With dead ends: 224 [2021-11-25 17:57:00,868 INFO L226 Difference]: Without dead ends: 119 [2021-11-25 17:57:00,869 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 78 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 3 IntricatePredicates, 0 DeprecatedPredicates, 1289 ImplicationChecksByTransitivity, 8.8s TimeCoverageRelationStatistics Valid=385, Invalid=5476, Unknown=3, NotChecked=456, Total=6320 [2021-11-25 17:57:00,869 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 82 mSDsluCounter, 617 mSDsCounter, 0 mSdLazyCounter, 432 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 82 SdHoareTripleChecker+Valid, 591 SdHoareTripleChecker+Invalid, 596 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 432 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 136 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 17:57:00,870 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [82 Valid, 591 Invalid, 596 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 432 Invalid, 0 Unknown, 136 Unchecked, 0.2s Time] [2021-11-25 17:57:00,870 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2021-11-25 17:57:00,873 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 118. [2021-11-25 17:57:00,873 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 117 states have (on average 1.1538461538461537) internal successors, (135), 117 states have internal predecessors, (135), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:57:00,874 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 135 transitions. [2021-11-25 17:57:00,874 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 135 transitions. Word has length 41 [2021-11-25 17:57:00,874 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:57:00,874 INFO L470 AbstractCegarLoop]: Abstraction has 118 states and 135 transitions. [2021-11-25 17:57:00,875 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 1.9583333333333333) internal successors, (94), 47 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:57:00,875 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 135 transitions. [2021-11-25 17:57:00,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-25 17:57:00,875 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:57:00,876 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:57:00,899 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-25 17:57:01,082 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-11-25 17:57:01,082 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-25 17:57:01,083 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:57:01,083 INFO L85 PathProgramCache]: Analyzing trace with hash -1079563323, now seen corresponding path program 8 times [2021-11-25 17:57:01,083 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:57:01,083 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1807112362] [2021-11-25 17:57:01,083 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:57:01,083 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:57:01,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:57:01,292 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 12 proven. 57 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 17:57:01,292 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:57:01,292 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1807112362] [2021-11-25 17:57:01,292 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1807112362] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 17:57:01,293 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [343329355] [2021-11-25 17:57:01,293 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 17:57:01,293 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:57:01,293 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:57:01,294 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:57:01,317 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-25 17:57:01,443 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-25 17:57:01,443 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 17:57:01,446 INFO L263 TraceCheckSpWp]: Trace formula consists of 316 conjuncts, 61 conjunts are in the unsatisfiable core [2021-11-25 17:57:01,448 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:57:01,466 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 17:57:01,467 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-25 17:57:01,799 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-25 17:57:01,866 INFO L354 Elim1Store]: treesize reduction 35, result has 20.5 percent of original size [2021-11-25 17:57:01,866 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 22 [2021-11-25 17:57:03,458 INFO L354 Elim1Store]: treesize reduction 28, result has 37.8 percent of original size [2021-11-25 17:57:03,458 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 28 treesize of output 26 [2021-11-25 17:57:03,638 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 3 proven. 21 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-25 17:57:03,638 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:57:04,097 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 56 treesize of output 50 [2021-11-25 17:57:05,129 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-25 17:57:05,130 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [343329355] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:57:05,130 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1248445634] [2021-11-25 17:57:05,131 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 17:57:05,132 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 17:57:05,132 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 17:57:05,132 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 17:57:05,132 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 17:57:05,167 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:57:05,169 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 17:57:05,196 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 17:57:05,231 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:57:05,265 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 17:57:05,324 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-25 17:57:05,325 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 87 treesize of output 86 [2021-11-25 17:57:05,390 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:57:05,420 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:57:05,545 INFO L354 Elim1Store]: treesize reduction 28, result has 44.0 percent of original size [2021-11-25 17:57:05,546 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 175 treesize of output 179 [2021-11-25 17:57:05,695 INFO L354 Elim1Store]: treesize reduction 68, result has 37.6 percent of original size [2021-11-25 17:57:05,695 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 193 treesize of output 208 [2021-11-25 17:57:07,193 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 17:57:09,038 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8286#(and (<= |ULTIMATE.start_cstrpbrk_~s2#1.offset| 0) (<= 1 |ULTIMATE.start_cstrpbrk_~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrpbrk_~s2#1.offset|) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cstrpbrk_#in~s2#1.offset| 0) (<= |ULTIMATE.start_cstrpbrk_#in~s1#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrpbrk_#in~s1#1.base|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (< (select |#length| |ULTIMATE.start_cstrpbrk_#t~post2#1.base|) (+ |ULTIMATE.start_cstrpbrk_#t~post2#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrpbrk_~s1#1.base|) (<= 0 |ULTIMATE.start_cstrpbrk_#in~s2#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (= |ULTIMATE.start_main_#t~malloc9#1.offset| 0) (<= 0 |ULTIMATE.start_cstrpbrk_~s2#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrpbrk_#in~s2#1.offset|) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrpbrk_#t~post2#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc9#1.base|) (<= 0 |ULTIMATE.start_cstrpbrk_#t~post2#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 0 |ULTIMATE.start_cstrpbrk_#in~s1#1.offset|) (= |#NULL.base| 0))' at error location [2021-11-25 17:57:09,039 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 17:57:09,039 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 17:57:09,039 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 10, 10] total 33 [2021-11-25 17:57:09,039 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1134858778] [2021-11-25 17:57:09,039 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 17:57:09,043 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-25 17:57:09,043 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:57:09,043 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-25 17:57:09,044 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=188, Invalid=2068, Unknown=0, NotChecked=0, Total=2256 [2021-11-25 17:57:09,044 INFO L87 Difference]: Start difference. First operand 118 states and 135 transitions. Second operand has 35 states, 34 states have (on average 2.6176470588235294) internal successors, (89), 34 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:57:22,530 WARN L227 SmtUtils]: Spent 12.60s on a formula simplification. DAG size of input: 56 DAG size of output: 48 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 17:57:25,707 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:57:25,707 INFO L93 Difference]: Finished difference Result 160 states and 178 transitions. [2021-11-25 17:57:25,707 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-11-25 17:57:25,707 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 34 states have (on average 2.6176470588235294) internal successors, (89), 34 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 43 [2021-11-25 17:57:25,707 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:57:25,708 INFO L225 Difference]: With dead ends: 160 [2021-11-25 17:57:25,708 INFO L226 Difference]: Without dead ends: 0 [2021-11-25 17:57:25,708 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 197 GetRequests, 106 SyntacticMatches, 8 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2169 ImplicationChecksByTransitivity, 19.2s TimeCoverageRelationStatistics Valid=671, Invalid=6468, Unknown=1, NotChecked=0, Total=7140 [2021-11-25 17:57:25,709 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 153 mSDsluCounter, 312 mSDsCounter, 0 mSdLazyCounter, 182 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 153 SdHoareTripleChecker+Valid, 332 SdHoareTripleChecker+Invalid, 273 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 182 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 73 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 17:57:25,709 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [153 Valid, 332 Invalid, 273 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 182 Invalid, 0 Unknown, 73 Unchecked, 0.1s Time] [2021-11-25 17:57:25,710 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-11-25 17:57:25,710 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-11-25 17:57:25,710 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:57:25,710 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-11-25 17:57:25,711 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 43 [2021-11-25 17:57:25,711 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:57:25,711 INFO L470 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-11-25 17:57:25,711 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 34 states have (on average 2.6176470588235294) internal successors, (89), 34 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:57:25,711 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-11-25 17:57:25,712 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-11-25 17:57:25,714 INFO L764 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0REQUIRES_VIOLATION (12 of 13 remaining) [2021-11-25 17:57:25,714 INFO L764 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr1REQUIRES_VIOLATION (11 of 13 remaining) [2021-11-25 17:57:25,715 INFO L764 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr2REQUIRES_VIOLATION (10 of 13 remaining) [2021-11-25 17:57:25,715 INFO L764 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr3REQUIRES_VIOLATION (9 of 13 remaining) [2021-11-25 17:57:25,715 INFO L764 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr4REQUIRES_VIOLATION (8 of 13 remaining) [2021-11-25 17:57:25,715 INFO L764 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr5REQUIRES_VIOLATION (7 of 13 remaining) [2021-11-25 17:57:25,715 INFO L764 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr6REQUIRES_VIOLATION (6 of 13 remaining) [2021-11-25 17:57:25,716 INFO L764 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr7REQUIRES_VIOLATION (5 of 13 remaining) [2021-11-25 17:57:25,716 INFO L764 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr8REQUIRES_VIOLATION (4 of 13 remaining) [2021-11-25 17:57:25,716 INFO L764 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr9REQUIRES_VIOLATION (3 of 13 remaining) [2021-11-25 17:57:25,716 INFO L764 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr10REQUIRES_VIOLATION (2 of 13 remaining) [2021-11-25 17:57:25,716 INFO L764 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr11REQUIRES_VIOLATION (1 of 13 remaining) [2021-11-25 17:57:25,717 INFO L764 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr12ASSERT_VIOLATIONMEMORY_LEAK (0 of 13 remaining) [2021-11-25 17:57:25,754 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-25 17:57:25,931 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-11-25 17:57:25,934 INFO L732 BasicCegarLoop]: Path program histogram: [8, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:57:25,936 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-11-25 17:57:25,939 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 25.11 05:57:25 BoogieIcfgContainer [2021-11-25 17:57:25,940 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-11-25 17:57:25,940 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-11-25 17:57:25,940 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-11-25 17:57:25,940 INFO L275 PluginConnector]: Witness Printer initialized [2021-11-25 17:57:25,941 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 05:55:13" (3/4) ... [2021-11-25 17:57:25,943 INFO L137 WitnessPrinter]: Generating witness for correct program [2021-11-25 17:57:25,952 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 22 nodes and edges [2021-11-25 17:57:25,953 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 8 nodes and edges [2021-11-25 17:57:25,953 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 2 nodes and edges [2021-11-25 17:57:25,953 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2021-11-25 17:57:25,996 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/witness.graphml [2021-11-25 17:57:25,997 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-11-25 17:57:25,997 INFO L158 Benchmark]: Toolchain (without parser) took 133580.86ms. Allocated memory was 98.6MB in the beginning and 251.7MB in the end (delta: 153.1MB). Free memory was 62.3MB in the beginning and 97.0MB in the end (delta: -34.7MB). Peak memory consumption was 118.2MB. Max. memory is 16.1GB. [2021-11-25 17:57:25,998 INFO L158 Benchmark]: CDTParser took 0.29ms. Allocated memory is still 75.5MB. Free memory was 49.0MB in the beginning and 49.0MB in the end (delta: 28.8kB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-25 17:57:25,998 INFO L158 Benchmark]: CACSL2BoogieTranslator took 534.65ms. Allocated memory is still 98.6MB. Free memory was 62.0MB in the beginning and 67.6MB in the end (delta: -5.6MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. [2021-11-25 17:57:25,998 INFO L158 Benchmark]: Boogie Procedure Inliner took 56.35ms. Allocated memory is still 98.6MB. Free memory was 67.6MB in the beginning and 65.5MB in the end (delta: 2.1MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-11-25 17:57:25,998 INFO L158 Benchmark]: Boogie Preprocessor took 28.14ms. Allocated memory is still 98.6MB. Free memory was 65.5MB in the beginning and 64.2MB in the end (delta: 1.3MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-11-25 17:57:25,999 INFO L158 Benchmark]: RCFGBuilder took 490.92ms. Allocated memory is still 98.6MB. Free memory was 64.2MB in the beginning and 49.2MB in the end (delta: 15.1MB). Peak memory consumption was 14.7MB. Max. memory is 16.1GB. [2021-11-25 17:57:25,999 INFO L158 Benchmark]: TraceAbstraction took 132408.54ms. Allocated memory was 98.6MB in the beginning and 251.7MB in the end (delta: 153.1MB). Free memory was 48.8MB in the beginning and 100.1MB in the end (delta: -51.3MB). Peak memory consumption was 104.0MB. Max. memory is 16.1GB. [2021-11-25 17:57:25,999 INFO L158 Benchmark]: Witness Printer took 56.73ms. Allocated memory is still 251.7MB. Free memory was 100.1MB in the beginning and 97.0MB in the end (delta: 3.1MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-11-25 17:57:26,001 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.29ms. Allocated memory is still 75.5MB. Free memory was 49.0MB in the beginning and 49.0MB in the end (delta: 28.8kB). There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 534.65ms. Allocated memory is still 98.6MB. Free memory was 62.0MB in the beginning and 67.6MB in the end (delta: -5.6MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 56.35ms. Allocated memory is still 98.6MB. Free memory was 67.6MB in the beginning and 65.5MB in the end (delta: 2.1MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Boogie Preprocessor took 28.14ms. Allocated memory is still 98.6MB. Free memory was 65.5MB in the beginning and 64.2MB in the end (delta: 1.3MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * RCFGBuilder took 490.92ms. Allocated memory is still 98.6MB. Free memory was 64.2MB in the beginning and 49.2MB in the end (delta: 15.1MB). Peak memory consumption was 14.7MB. Max. memory is 16.1GB. * TraceAbstraction took 132408.54ms. Allocated memory was 98.6MB in the beginning and 251.7MB in the end (delta: 153.1MB). Free memory was 48.8MB in the beginning and 100.1MB in the end (delta: -51.3MB). Peak memory consumption was 104.0MB. Max. memory is 16.1GB. * Witness Printer took 56.73ms. Allocated memory is still 251.7MB. Free memory was 100.1MB in the beginning and 97.0MB in the end (delta: 3.1MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - PositiveResult [Line: 539]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 539]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 543]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 543]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 546]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 546]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 547]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 547]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 518]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 518]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 519]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 519]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 525]: all allocated memory was freed For all program executions holds that all allocated memory was freed at this location - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 31 locations, 13 error locations. Started 1 CEGAR loops. OverallTime: 132.3s, OverallIterations: 29, TraceHistogramMax: 5, PathProgramHistogramMax: 8, EmptinessCheckTime: 0.0s, AutomataDifference: 29.7s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, PartialOrderReductionTime: 0.0s, HoareTripleCheckerStatistics: 0 mSolverCounterUnknown, 2384 SdHoareTripleChecker+Valid, 3.3s IncrementalHoareTripleChecker+Time, 0 mSdLazyCounter, 2384 mSDsluCounter, 3458 SdHoareTripleChecker+Invalid, 2.7s Time, 0 mProtectedAction, 0 SdHoareTripleChecker+Unchecked, 951 IncrementalHoareTripleChecker+Unchecked, 3389 mSDsCounter, 411 IncrementalHoareTripleChecker+Valid, 0 mProtectedPredicate, 5305 IncrementalHoareTripleChecker+Invalid, 6667 SdHoareTripleChecker+Unknown, 0 mSolverCounterNotChecked, 411 mSolverCounterUnsat, 417 mSDtfsCounter, 5305 mSolverCounterSat, 0.1s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Unknown, PredicateUnifierStatistics: 0 DeclaredPredicates, 1888 GetRequests, 902 SyntacticMatches, 23 SemanticMatches, 963 ConstructedPredicates, 5 IntricatePredicates, 5 DeprecatedPredicates, 13585 ImplicationChecksByTransitivity, 84.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=235occurred in iteration=25, InterpolantAutomatonStates: 416, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 29 MinimizatonAttempts, 428 StatesRemovedByMinimization, 21 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.2s SsaConstructionTime, 1.1s SatisfiabilityAnalysisTime, 22.9s InterpolantComputationTime, 1026 NumberOfCodeBlocks, 1014 NumberOfCodeBlocksAsserted, 64 NumberOfCheckSat, 1437 ConstructedInterpolants, 145 QuantifiedInterpolants, 18919 SizeOfPredicates, 304 NumberOfNonLiveVariables, 3866 ConjunctsInSsa, 773 ConjunctsInUnsatCore, 69 InterpolantComputations, 9 PerfectInterpolantSequences, 568/1226 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: OVERALL_TIME: 1.8s, ICFG_INTERPRETER_ENTERED_PROCEDURES: 3, DAG_INTERPRETER_EARLY_EXIT_QUERIES_NONTRIVIAL: 28, DAG_INTERPRETER_EARLY_EXITS: 0, TOOLS_POST_APPLICATIONS: 61, TOOLS_POST_TIME: 1.5s, TOOLS_POST_CALL_APPLICATIONS: 0, TOOLS_POST_CALL_TIME: 0.0s, TOOLS_POST_RETURN_APPLICATIONS: 0, TOOLS_POST_RETURN_TIME: 0.0s, TOOLS_QUANTIFIERELIM_APPLICATIONS: 61, TOOLS_QUANTIFIERELIM_TIME: 1.5s, TOOLS_QUANTIFIERELIM_MAX_TIME: 0.2s, FLUID_QUERY_TIME: 0.0s, FLUID_QUERIES: 131, FLUID_YES_ANSWERS: 0, DOMAIN_JOIN_APPLICATIONS: 6, DOMAIN_JOIN_TIME: 0.1s, DOMAIN_ALPHA_APPLICATIONS: 0, DOMAIN_ALPHA_TIME: 0.0s, DOMAIN_WIDEN_APPLICATIONS: 9, DOMAIN_WIDEN_TIME: 0.1s, DOMAIN_ISSUBSETEQ_APPLICATIONS: 15, DOMAIN_ISSUBSETEQ_TIME: 0.0s, DOMAIN_ISBOTTOM_APPLICATIONS: 28, DOMAIN_ISBOTTOM_TIME: 0.0s, LOOP_SUMMARIZER_APPLICATIONS: 6, LOOP_SUMMARIZER_CACHE_MISSES: 6, LOOP_SUMMARIZER_OVERALL_TIME: 0.8s, LOOP_SUMMARIZER_NEW_COMPUTATION_TIME: 0.8s, LOOP_SUMMARIZER_FIXPOINT_ITERATIONS: 15, CALL_SUMMARIZER_APPLICATIONS: 0, CALL_SUMMARIZER_CACHE_MISSES: 0, CALL_SUMMARIZER_OVERALL_TIME: 0.0s, CALL_SUMMARIZER_NEW_COMPUTATION_TIME: 0.0s, PROCEDURE_GRAPH_BUILDER_TIME: 0.0s, PATH_EXPR_TIME: 0.0s, REGEX_TO_DAG_TIME: 0.0s, DAG_COMPRESSION_TIME: 0.0s, DAG_COMPRESSION_PROCESSED_NODES: 378, DAG_COMPRESSION_RETAINED_NODES: 98, ReuseStatistics: No data available - AllSpecificationsHoldResult: All specifications hold 13 specifications checked. All of them hold RESULT: Ultimate proved your program to be correct! [2021-11-25 17:57:26,086 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_22cf7f2d-f830-40e1-a215-a03c7c0d93ed/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request... --- End real Ultimate output --- Execution finished normally Writing output log to file Ultimate.log Result: TRUE