./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/array-memsafety/add_last-alloca-1.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_e9dd74b5-b196-428e-8e79-6da2d4c1d5b8/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e9dd74b5-b196-428e-8e79-6da2d4c1d5b8/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_e9dd74b5-b196-428e-8e79-6da2d4c1d5b8/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e9dd74b5-b196-428e-8e79-6da2d4c1d5b8/bin/utaipan-eEHZpOm5b7/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/add_last-alloca-1.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e9dd74b5-b196-428e-8e79-6da2d4c1d5b8/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_e9dd74b5-b196-428e-8e79-6da2d4c1d5b8/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 870a7e5617be5a547f8d530603b5c27ad6cbb74bb05a83654285fee7bbb92753 --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 18:02:31,974 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 18:02:31,978 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 18:02:32,033 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 18:02:32,034 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 18:02:32,035 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 18:02:32,037 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 18:02:32,039 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 18:02:32,042 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 18:02:32,043 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 18:02:32,045 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 18:02:32,046 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 18:02:32,047 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 18:02:32,048 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 18:02:32,050 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 18:02:32,051 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 18:02:32,053 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 18:02:32,054 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 18:02:32,056 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 18:02:32,059 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 18:02:32,061 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 18:02:32,064 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 18:02:32,066 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 18:02:32,067 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 18:02:32,071 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 18:02:32,072 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 18:02:32,072 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 18:02:32,073 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 18:02:32,074 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 18:02:32,075 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 18:02:32,076 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 18:02:32,077 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 18:02:32,078 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 18:02:32,087 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 18:02:32,091 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 18:02:32,091 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 18:02:32,092 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 18:02:32,092 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 18:02:32,092 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 18:02:32,094 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 18:02:32,094 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 18:02:32,095 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e9dd74b5-b196-428e-8e79-6da2d4c1d5b8/bin/utaipan-eEHZpOm5b7/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2021-11-25 18:02:32,149 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 18:02:32,149 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 18:02:32,150 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 18:02:32,151 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 18:02:32,152 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 18:02:32,153 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 18:02:32,153 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 18:02:32,153 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 18:02:32,153 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 18:02:32,154 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 18:02:32,155 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 18:02:32,155 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 18:02:32,155 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 18:02:32,156 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 18:02:32,156 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 18:02:32,156 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 18:02:32,157 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 18:02:32,157 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 18:02:32,158 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-25 18:02:32,158 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-25 18:02:32,158 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 18:02:32,158 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 18:02:32,159 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-11-25 18:02:32,160 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 18:02:32,161 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 18:02:32,161 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 18:02:32,161 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-11-25 18:02:32,162 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-11-25 18:02:32,162 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-11-25 18:02:32,166 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 18:02:32,166 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-25 18:02:32,167 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 18:02:32,167 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 18:02:32,167 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 18:02:32,167 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 18:02:32,168 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 18:02:32,168 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 18:02:32,168 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 18:02:32,169 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 18:02:32,169 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 18:02:32,169 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 18:02:32,169 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 18:02:32,169 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_e9dd74b5-b196-428e-8e79-6da2d4c1d5b8/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e9dd74b5-b196-428e-8e79-6da2d4c1d5b8/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 870a7e5617be5a547f8d530603b5c27ad6cbb74bb05a83654285fee7bbb92753 [2021-11-25 18:02:32,471 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 18:02:32,514 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 18:02:32,517 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 18:02:32,518 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 18:02:32,519 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 18:02:32,521 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e9dd74b5-b196-428e-8e79-6da2d4c1d5b8/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/array-memsafety/add_last-alloca-1.i [2021-11-25 18:02:32,607 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e9dd74b5-b196-428e-8e79-6da2d4c1d5b8/bin/utaipan-eEHZpOm5b7/data/f51f6d983/17fdf1bb0e0349ceaf84e70f8a1aff48/FLAGd4c2faef6 [2021-11-25 18:02:33,233 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 18:02:33,233 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e9dd74b5-b196-428e-8e79-6da2d4c1d5b8/sv-benchmarks/c/array-memsafety/add_last-alloca-1.i [2021-11-25 18:02:33,251 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e9dd74b5-b196-428e-8e79-6da2d4c1d5b8/bin/utaipan-eEHZpOm5b7/data/f51f6d983/17fdf1bb0e0349ceaf84e70f8a1aff48/FLAGd4c2faef6 [2021-11-25 18:02:33,499 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e9dd74b5-b196-428e-8e79-6da2d4c1d5b8/bin/utaipan-eEHZpOm5b7/data/f51f6d983/17fdf1bb0e0349ceaf84e70f8a1aff48 [2021-11-25 18:02:33,502 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 18:02:33,504 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 18:02:33,512 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 18:02:33,512 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 18:02:33,516 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 18:02:33,517 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 06:02:33" (1/1) ... [2021-11-25 18:02:33,519 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1c12c5e1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:02:33, skipping insertion in model container [2021-11-25 18:02:33,519 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 06:02:33" (1/1) ... [2021-11-25 18:02:33,527 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 18:02:33,568 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 18:02:33,905 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 18:02:33,913 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 18:02:33,957 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 18:02:33,988 INFO L208 MainTranslator]: Completed translation [2021-11-25 18:02:33,988 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:02:33 WrapperNode [2021-11-25 18:02:33,989 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 18:02:33,990 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 18:02:33,990 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 18:02:33,990 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 18:02:33,999 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:02:33" (1/1) ... [2021-11-25 18:02:34,014 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:02:33" (1/1) ... [2021-11-25 18:02:34,038 INFO L137 Inliner]: procedures = 115, calls = 12, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 55 [2021-11-25 18:02:34,038 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 18:02:34,039 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 18:02:34,040 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 18:02:34,040 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 18:02:34,051 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:02:33" (1/1) ... [2021-11-25 18:02:34,051 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:02:33" (1/1) ... [2021-11-25 18:02:34,055 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:02:33" (1/1) ... [2021-11-25 18:02:34,055 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:02:33" (1/1) ... [2021-11-25 18:02:34,061 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:02:33" (1/1) ... [2021-11-25 18:02:34,065 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:02:33" (1/1) ... [2021-11-25 18:02:34,067 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:02:33" (1/1) ... [2021-11-25 18:02:34,069 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 18:02:34,070 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 18:02:34,071 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 18:02:34,071 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 18:02:34,072 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:02:33" (1/1) ... [2021-11-25 18:02:34,081 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 18:02:34,092 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e9dd74b5-b196-428e-8e79-6da2d4c1d5b8/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:02:34,108 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e9dd74b5-b196-428e-8e79-6da2d4c1d5b8/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 18:02:34,130 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e9dd74b5-b196-428e-8e79-6da2d4c1d5b8/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 18:02:34,171 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-25 18:02:34,172 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-25 18:02:34,173 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-25 18:02:34,173 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-25 18:02:34,173 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 18:02:34,173 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 18:02:34,293 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 18:02:34,295 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 18:02:34,544 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 18:02:34,612 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 18:02:34,613 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-25 18:02:34,615 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 06:02:34 BoogieIcfgContainer [2021-11-25 18:02:34,615 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 18:02:34,617 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 18:02:34,618 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 18:02:34,626 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 18:02:34,626 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 06:02:33" (1/3) ... [2021-11-25 18:02:34,627 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@410af965 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 06:02:34, skipping insertion in model container [2021-11-25 18:02:34,628 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:02:33" (2/3) ... [2021-11-25 18:02:34,628 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@410af965 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 06:02:34, skipping insertion in model container [2021-11-25 18:02:34,628 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 06:02:34" (3/3) ... [2021-11-25 18:02:34,630 INFO L111 eAbstractionObserver]: Analyzing ICFG add_last-alloca-1.i [2021-11-25 18:02:34,636 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 18:02:34,636 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 13 error locations. [2021-11-25 18:02:34,688 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 18:02:34,697 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 18:02:34,697 INFO L340 AbstractCegarLoop]: Starting to check reachability of 13 error locations. [2021-11-25 18:02:34,714 INFO L276 IsEmpty]: Start isEmpty. Operand has 26 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 25 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 18:02:34,721 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2021-11-25 18:02:34,721 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:02:34,722 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1] [2021-11-25 18:02:34,723 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr12ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-25 18:02:34,729 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:02:34,729 INFO L85 PathProgramCache]: Analyzing trace with hash 99416, now seen corresponding path program 1 times [2021-11-25 18:02:34,740 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:02:34,741 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1262609615] [2021-11-25 18:02:34,741 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:02:34,743 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:02:34,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:02:35,021 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:02:35,022 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:02:35,023 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1262609615] [2021-11-25 18:02:35,024 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1262609615] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:02:35,024 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:02:35,025 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 18:02:35,027 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1662545121] [2021-11-25 18:02:35,028 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:02:35,033 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:02:35,034 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:02:35,080 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:02:35,081 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 18:02:35,084 INFO L87 Difference]: Start difference. First operand has 26 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 25 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) Second operand has 3 states, 3 states have (on average 1.0) 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 18:02:35,155 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:02:35,156 INFO L93 Difference]: Finished difference Result 26 states and 27 transitions. [2021-11-25 18:02:35,159 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:02:35,161 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 1.0) 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 18:02:35,161 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:02:35,170 INFO L225 Difference]: With dead ends: 26 [2021-11-25 18:02:35,171 INFO L226 Difference]: Without dead ends: 25 [2021-11-25 18:02:35,174 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 18:02:35,180 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 23 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 17 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 18:02:35,181 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 13 Invalid, 17 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 18:02:35,203 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-11-25 18:02:35,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2021-11-25 18:02:35,219 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 12 states have (on average 2.1666666666666665) internal successors, (26), 24 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:02:35,221 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2021-11-25 18:02:35,222 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 3 [2021-11-25 18:02:35,222 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:02:35,223 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2021-11-25 18:02:35,223 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 1.0) 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 18:02:35,223 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2021-11-25 18:02:35,224 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2021-11-25 18:02:35,224 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:02:35,224 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2021-11-25 18:02:35,225 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-25 18:02:35,226 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-25 18:02:35,231 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:02:35,231 INFO L85 PathProgramCache]: Analyzing trace with hash 3084102, now seen corresponding path program 1 times [2021-11-25 18:02:35,231 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:02:35,232 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [965476493] [2021-11-25 18:02:35,233 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:02:35,233 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:02:35,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:02:35,299 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:02:35,300 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:02:35,300 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [965476493] [2021-11-25 18:02:35,300 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [965476493] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:02:35,300 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:02:35,301 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 18:02:35,301 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1947417632] [2021-11-25 18:02:35,301 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:02:35,302 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 18:02:35,303 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:02:35,303 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 18:02:35,304 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 18:02:35,304 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand has 4 states, 3 states have (on average 1.3333333333333333) 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 18:02:35,358 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:02:35,358 INFO L93 Difference]: Finished difference Result 19 states and 20 transitions. [2021-11-25 18:02:35,358 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 18:02:35,359 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.3333333333333333) 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 18:02:35,359 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:02:35,360 INFO L225 Difference]: With dead ends: 19 [2021-11-25 18:02:35,360 INFO L226 Difference]: Without dead ends: 19 [2021-11-25 18:02:35,360 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 18:02:35,362 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 30 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 4 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 18:02:35,363 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 4 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 18:02:35,365 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-11-25 18:02:35,367 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2021-11-25 18:02:35,367 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 18 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:02:35,368 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2021-11-25 18:02:35,369 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 4 [2021-11-25 18:02:35,369 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:02:35,369 INFO L470 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2021-11-25 18:02:35,369 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.3333333333333333) 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 18:02:35,370 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2021-11-25 18:02:35,370 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2021-11-25 18:02:35,370 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:02:35,370 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2021-11-25 18:02:35,371 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-25 18:02:35,371 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-25 18:02:35,372 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:02:35,372 INFO L85 PathProgramCache]: Analyzing trace with hash 3084103, now seen corresponding path program 1 times [2021-11-25 18:02:35,372 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:02:35,373 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1173187556] [2021-11-25 18:02:35,373 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:02:35,373 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:02:35,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:02:35,463 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:02:35,463 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:02:35,464 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1173187556] [2021-11-25 18:02:35,464 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1173187556] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:02:35,464 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:02:35,464 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 18:02:35,465 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [836989939] [2021-11-25 18:02:35,465 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:02:35,465 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 18:02:35,466 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:02:35,466 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 18:02:35,467 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 18:02:35,467 INFO L87 Difference]: Start difference. First operand 19 states and 20 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 18:02:35,501 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:02:35,502 INFO L93 Difference]: Finished difference Result 22 states and 23 transitions. [2021-11-25 18:02:35,502 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 18:02:35,503 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 18:02:35,503 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:02:35,504 INFO L225 Difference]: With dead ends: 22 [2021-11-25 18:02:35,504 INFO L226 Difference]: Without dead ends: 22 [2021-11-25 18:02:35,504 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 18:02:35,506 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 21 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 18:02:35,507 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 19 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 18:02:35,508 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-11-25 18:02:35,511 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 20. [2021-11-25 18:02:35,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 19 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:02:35,512 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2021-11-25 18:02:35,513 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 4 [2021-11-25 18:02:35,513 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:02:35,513 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2021-11-25 18:02:35,513 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 18:02:35,514 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2021-11-25 18:02:35,514 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2021-11-25 18:02:35,514 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:02:35,514 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2021-11-25 18:02:35,515 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-25 18:02:35,515 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-25 18:02:35,516 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:02:35,516 INFO L85 PathProgramCache]: Analyzing trace with hash 3082634, now seen corresponding path program 1 times [2021-11-25 18:02:35,516 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:02:35,516 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1338084605] [2021-11-25 18:02:35,517 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:02:35,517 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:02:35,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:02:35,629 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:02:35,630 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:02:35,633 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1338084605] [2021-11-25 18:02:35,633 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1338084605] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:02:35,633 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:02:35,634 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 18:02:35,634 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1613490031] [2021-11-25 18:02:35,634 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:02:35,635 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 18:02:35,635 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:02:35,635 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 18:02:35,636 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-25 18:02:35,640 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand has 5 states, 4 states have (on average 1.0) internal successors, (4), 4 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 18:02:35,749 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:02:35,749 INFO L93 Difference]: Finished difference Result 21 states and 22 transitions. [2021-11-25 18:02:35,750 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 18:02:35,750 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.0) internal successors, (4), 4 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 18:02:35,750 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:02:35,751 INFO L225 Difference]: With dead ends: 21 [2021-11-25 18:02:35,751 INFO L226 Difference]: Without dead ends: 21 [2021-11-25 18:02:35,751 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-25 18:02:35,753 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 21 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:02:35,754 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 12 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:02:35,755 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-11-25 18:02:35,757 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2021-11-25 18:02:35,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 14 states have (on average 1.5714285714285714) internal successors, (22), 20 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:02:35,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2021-11-25 18:02:35,758 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 4 [2021-11-25 18:02:35,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:02:35,758 INFO L470 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2021-11-25 18:02:35,759 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.0) internal successors, (4), 4 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 18:02:35,759 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2021-11-25 18:02:35,759 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-25 18:02:35,759 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:02:35,760 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-25 18:02:35,760 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-25 18:02:35,760 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-25 18:02:35,761 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:02:35,761 INFO L85 PathProgramCache]: Analyzing trace with hash -1332513484, now seen corresponding path program 1 times [2021-11-25 18:02:35,761 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:02:35,761 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [318175448] [2021-11-25 18:02:35,762 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:02:35,762 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:02:35,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:02:35,916 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:02:35,916 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:02:35,917 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [318175448] [2021-11-25 18:02:35,917 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [318175448] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:02:35,917 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [909528630] [2021-11-25 18:02:35,917 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:02:35,918 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:02:35,918 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e9dd74b5-b196-428e-8e79-6da2d4c1d5b8/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:02:35,924 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e9dd74b5-b196-428e-8e79-6da2d4c1d5b8/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:02:35,950 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e9dd74b5-b196-428e-8e79-6da2d4c1d5b8/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 18:02:35,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:02:36,001 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-25 18:02:36,008 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:02:36,196 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:02:36,196 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:02:36,297 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 18:02:36,298 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 27 treesize of output 31 [2021-11-25 18:02:36,530 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:02:36,530 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [909528630] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:02:36,530 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [494077914] [2021-11-25 18:02:36,559 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2021-11-25 18:02:36,560 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:02:36,565 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:02:36,576 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:02:36,577 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:02:36,699 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 8 treesize of output 7 [2021-11-25 18:02:36,812 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 18:02:36,958 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 16 treesize of output 12 [2021-11-25 18:02:37,015 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 16 treesize of output 12 [2021-11-25 18:02:37,096 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:02:37,581 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '262#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc3#1.base|) (<= 0 |ULTIMATE.start_main_~a~0#1.offset|) (<= |ULTIMATE.start_main_~arr~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~a~0#1.base|) (= |ULTIMATE.start_main_#t~malloc3#1.offset| 0) (< (select |#length| |ULTIMATE.start_main_~a~0#1.base|) (+ |ULTIMATE.start_main_~a~0#1.offset| 4)) (<= |ULTIMATE.start_main_~length~0#1| |ULTIMATE.start_main_~k~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= 0 |ULTIMATE.start_main_~arr~0#1.base|) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~arr~0#1.offset|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1.offset| 0) (= |#NULL.base| 0))' at error location [2021-11-25 18:02:37,581 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:02:37,581 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:02:37,581 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 3, 3] total 8 [2021-11-25 18:02:37,581 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [969951974] [2021-11-25 18:02:37,582 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:02:37,582 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-25 18:02:37,582 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:02:37,583 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-25 18:02:37,583 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2021-11-25 18:02:37,584 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand has 10 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 9 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 18:02:37,834 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:02:37,834 INFO L93 Difference]: Finished difference Result 30 states and 31 transitions. [2021-11-25 18:02:37,835 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-25 18:02:37,835 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 9 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 6 [2021-11-25 18:02:37,836 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:02:37,836 INFO L225 Difference]: With dead ends: 30 [2021-11-25 18:02:37,836 INFO L226 Difference]: Without dead ends: 30 [2021-11-25 18:02:37,837 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 6 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=77, Invalid=265, Unknown=0, NotChecked=0, Total=342 [2021-11-25 18:02:37,838 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 74 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 70 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 74 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 85 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 70 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:02:37,839 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [74 Valid, 24 Invalid, 85 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 70 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:02:37,840 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-11-25 18:02:37,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 20. [2021-11-25 18:02:37,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 15 states have (on average 1.4) internal successors, (21), 19 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:02:37,843 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2021-11-25 18:02:37,843 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 6 [2021-11-25 18:02:37,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:02:37,843 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2021-11-25 18:02:37,843 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 9 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 18:02:37,843 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2021-11-25 18:02:37,844 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-25 18:02:37,844 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:02:37,844 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1] [2021-11-25 18:02:37,883 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e9dd74b5-b196-428e-8e79-6da2d4c1d5b8/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-25 18:02:38,045 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e9dd74b5-b196-428e-8e79-6da2d4c1d5b8/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:02:38,045 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-25 18:02:38,046 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:02:38,046 INFO L85 PathProgramCache]: Analyzing trace with hash -1332514953, now seen corresponding path program 1 times [2021-11-25 18:02:38,046 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:02:38,046 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [888435675] [2021-11-25 18:02:38,046 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:02:38,046 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:02:38,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:02:38,180 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:02:38,180 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:02:38,181 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [888435675] [2021-11-25 18:02:38,181 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [888435675] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:02:38,181 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1148100498] [2021-11-25 18:02:38,181 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:02:38,182 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:02:38,182 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e9dd74b5-b196-428e-8e79-6da2d4c1d5b8/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:02:38,183 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e9dd74b5-b196-428e-8e79-6da2d4c1d5b8/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:02:38,186 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e9dd74b5-b196-428e-8e79-6da2d4c1d5b8/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-25 18:02:38,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:02:38,238 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-25 18:02:38,240 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:02:38,267 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 18:02:38,340 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:02:38,340 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:02:38,532 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:02:38,533 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1148100498] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:02:38,533 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [709775970] [2021-11-25 18:02:38,536 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2021-11-25 18:02:38,536 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:02:38,537 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:02:38,537 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:02:38,537 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:02:38,583 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 8 treesize of output 7 [2021-11-25 18:02:38,647 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 16 treesize of output 12 [2021-11-25 18:02:38,717 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 16 treesize of output 12 [2021-11-25 18:02:38,760 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 16 treesize of output 12 [2021-11-25 18:02:38,784 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:02:39,125 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '366#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc3#1.base|) (<= 0 |ULTIMATE.start_main_~a~0#1.offset|) (<= 0 (+ 2147483648 |ULTIMATE.start_main_#t~nondet5#1|)) (<= |ULTIMATE.start_main_~arr~0#1.offset| 0) (<= |ULTIMATE.start_main_#t~nondet5#1| 2147483647) (<= 0 |ULTIMATE.start_main_~a~0#1.base|) (= |ULTIMATE.start_main_#t~malloc3#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= 0 |ULTIMATE.start_main_~arr~0#1.base|) (= |#NULL.offset| 0) (< (select |#length| |ULTIMATE.start_main_~arr~0#1.base|) (+ (* 4 |ULTIMATE.start_main_~k~0#1|) |ULTIMATE.start_main_~arr~0#1.offset| 4)) (<= 0 |ULTIMATE.start_main_~arr~0#1.offset|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1.offset| 0) (= |#NULL.base| 0))' at error location [2021-11-25 18:02:39,125 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:02:39,125 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:02:39,125 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 9 [2021-11-25 18:02:39,125 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [150700802] [2021-11-25 18:02:39,126 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:02:39,126 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-25 18:02:39,126 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:02:39,127 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-25 18:02:39,127 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=160, Unknown=0, NotChecked=0, Total=210 [2021-11-25 18:02:39,127 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand has 11 states, 10 states have (on average 1.5) internal successors, (15), 10 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 18:02:39,227 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:02:39,227 INFO L93 Difference]: Finished difference Result 19 states and 20 transitions. [2021-11-25 18:02:39,228 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-25 18:02:39,228 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 1.5) internal successors, (15), 10 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 6 [2021-11-25 18:02:39,228 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:02:39,229 INFO L225 Difference]: With dead ends: 19 [2021-11-25 18:02:39,229 INFO L226 Difference]: Without dead ends: 19 [2021-11-25 18:02:39,229 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 6 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=69, Invalid=203, Unknown=0, NotChecked=0, Total=272 [2021-11-25 18:02:39,230 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 19 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:02:39,231 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 12 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:02:39,232 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-11-25 18:02:39,234 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 18. [2021-11-25 18:02:39,234 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 17 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:02:39,235 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2021-11-25 18:02:39,235 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 6 [2021-11-25 18:02:39,235 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:02:39,235 INFO L470 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2021-11-25 18:02:39,235 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 1.5) internal successors, (15), 10 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 18:02:39,236 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2021-11-25 18:02:39,236 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-25 18:02:39,236 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:02:39,236 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:02:39,283 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e9dd74b5-b196-428e-8e79-6da2d4c1d5b8/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-25 18:02:39,458 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e9dd74b5-b196-428e-8e79-6da2d4c1d5b8/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:02:39,459 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 18:02:39,459 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:02:39,459 INFO L85 PathProgramCache]: Analyzing trace with hash 1641754934, now seen corresponding path program 1 times [2021-11-25 18:02:39,460 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:02:39,460 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [425172869] [2021-11-25 18:02:39,460 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:02:39,460 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:02:39,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:02:39,696 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:02:39,696 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:02:39,696 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [425172869] [2021-11-25 18:02:39,697 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [425172869] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:02:39,697 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1467237620] [2021-11-25 18:02:39,697 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:02:39,697 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:02:39,697 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e9dd74b5-b196-428e-8e79-6da2d4c1d5b8/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:02:39,701 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e9dd74b5-b196-428e-8e79-6da2d4c1d5b8/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:02:39,702 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e9dd74b5-b196-428e-8e79-6da2d4c1d5b8/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-25 18:02:39,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:02:39,747 INFO L263 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 18:02:39,748 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:02:39,867 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:02:39,867 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:02:39,945 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 28 treesize of output 24 [2021-11-25 18:02:39,997 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:02:39,997 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1467237620] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:02:39,997 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1115440210] [2021-11-25 18:02:40,003 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-25 18:02:40,003 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:02:40,003 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:02:40,004 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:02:40,004 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:02:40,046 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 8 treesize of output 7 [2021-11-25 18:02:40,096 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 18:02:40,152 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 16 treesize of output 12 [2021-11-25 18:02:40,188 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 16 treesize of output 12 [2021-11-25 18:02:40,277 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:02:40,840 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '463#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc3#1.base|) (<= 0 |ULTIMATE.start_main_~a~0#1.offset|) (<= (+ |ULTIMATE.start_main_~a~0#1.offset| 4) (select |#length| |ULTIMATE.start_main_~a~0#1.base|)) (<= |ULTIMATE.start_main_~arr~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~a~0#1.base|) (= |ULTIMATE.start_main_#t~malloc3#1.offset| 0) (<= |ULTIMATE.start_main_~length~0#1| |ULTIMATE.start_main_~k~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= 0 |ULTIMATE.start_main_~arr~0#1.base|) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~arr~0#1.offset|) (= (select |#valid| |ULTIMATE.start_main_~a~0#1.base|) 1) (< (select |#length| |ULTIMATE.start_main_~arr~0#1.base|) (+ (* 4 |ULTIMATE.start_main_~length~0#1|) |ULTIMATE.start_main_~arr~0#1.offset|)) (= (select (select |#memory_int| |ULTIMATE.start_main_~a~0#1.base|) |ULTIMATE.start_main_~a~0#1.offset|) |ULTIMATE.start_main_#t~mem6#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1.offset| 0) (= |#NULL.base| 0))' at error location [2021-11-25 18:02:40,840 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:02:40,840 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:02:40,840 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 14 [2021-11-25 18:02:40,840 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [657614005] [2021-11-25 18:02:40,840 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:02:40,841 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-25 18:02:40,841 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:02:40,842 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-25 18:02:40,842 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=340, Unknown=0, NotChecked=0, Total=462 [2021-11-25 18:02:40,842 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand has 16 states, 15 states have (on average 1.3333333333333333) internal successors, (20), 15 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:02:40,996 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:02:40,996 INFO L93 Difference]: Finished difference Result 17 states and 18 transitions. [2021-11-25 18:02:40,997 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 18:02:40,997 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 1.3333333333333333) internal successors, (20), 15 states have internal predecessors, (20), 0 states have call successors, (0), 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 7 [2021-11-25 18:02:40,998 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:02:40,998 INFO L225 Difference]: With dead ends: 17 [2021-11-25 18:02:40,998 INFO L226 Difference]: Without dead ends: 17 [2021-11-25 18:02:40,999 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 209 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=152, Invalid=400, Unknown=0, NotChecked=0, Total=552 [2021-11-25 18:02:41,000 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 59 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:02:41,000 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [59 Valid, 12 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:02:41,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-11-25 18:02:41,002 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 16. [2021-11-25 18:02:41,002 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 15 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:02:41,003 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2021-11-25 18:02:41,003 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 7 [2021-11-25 18:02:41,003 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:02:41,003 INFO L470 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2021-11-25 18:02:41,004 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 15 states have (on average 1.3333333333333333) internal successors, (20), 15 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:02:41,004 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2021-11-25 18:02:41,004 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-25 18:02:41,004 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:02:41,004 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:02:41,054 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e9dd74b5-b196-428e-8e79-6da2d4c1d5b8/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-25 18:02:41,230 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e9dd74b5-b196-428e-8e79-6da2d4c1d5b8/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:02:41,231 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr12ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-25 18:02:41,231 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:02:41,231 INFO L85 PathProgramCache]: Analyzing trace with hash -1566344423, now seen corresponding path program 1 times [2021-11-25 18:02:41,231 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:02:41,232 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [613309924] [2021-11-25 18:02:41,232 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:02:41,232 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:02:41,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:02:41,317 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 18:02:41,317 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:02:41,317 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [613309924] [2021-11-25 18:02:41,317 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [613309924] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:02:41,318 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:02:41,318 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 18:02:41,318 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [535414086] [2021-11-25 18:02:41,318 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:02:41,318 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 18:02:41,318 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:02:41,319 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 18:02:41,319 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 18:02:41,319 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:02:41,339 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:02:41,339 INFO L93 Difference]: Finished difference Result 15 states and 16 transitions. [2021-11-25 18:02:41,340 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 18:02:41,340 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 0 states have call successors, (0), 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 10 [2021-11-25 18:02:41,340 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:02:41,341 INFO L225 Difference]: With dead ends: 15 [2021-11-25 18:02:41,341 INFO L226 Difference]: Without dead ends: 13 [2021-11-25 18:02:41,341 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 18:02:41,342 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 5 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 18 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 18:02:41,343 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 10 Invalid, 18 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 18 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 18:02:41,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2021-11-25 18:02:41,347 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2021-11-25 18:02:41,348 INFO L82 GeneralOperation]: Start removeUnreachable. 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 18:02:41,349 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2021-11-25 18:02:41,349 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 10 [2021-11-25 18:02:41,349 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:02:41,350 INFO L470 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2021-11-25 18:02:41,350 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:02:41,350 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2021-11-25 18:02:41,351 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-25 18:02:41,351 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:02:41,351 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:02:41,351 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-25 18:02:41,352 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-25 18:02:41,352 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:02:41,352 INFO L85 PathProgramCache]: Analyzing trace with hash -2016986655, now seen corresponding path program 1 times [2021-11-25 18:02:41,352 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:02:41,353 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1978191100] [2021-11-25 18:02:41,353 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:02:41,353 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:02:41,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:02:41,822 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:02:41,823 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:02:41,823 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1978191100] [2021-11-25 18:02:41,823 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1978191100] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:02:41,823 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1188595979] [2021-11-25 18:02:41,823 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:02:41,824 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:02:41,824 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e9dd74b5-b196-428e-8e79-6da2d4c1d5b8/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:02:41,825 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e9dd74b5-b196-428e-8e79-6da2d4c1d5b8/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:02:41,850 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e9dd74b5-b196-428e-8e79-6da2d4c1d5b8/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-25 18:02:41,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:02:41,897 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-25 18:02:41,899 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:02:42,005 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 18:02:42,131 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:02:42,134 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 18:02:42,135 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 19 treesize of output 10 [2021-11-25 18:02:42,158 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:02:42,159 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:02:42,269 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 18:02:42,269 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 68 treesize of output 70 [2021-11-25 18:02:42,295 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 19 treesize of output 17 [2021-11-25 18:02:42,331 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 18:02:42,332 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 106 treesize of output 101 [2021-11-25 18:02:42,488 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:02:42,488 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1188595979] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:02:42,488 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [962880709] [2021-11-25 18:02:42,491 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-25 18:02:42,492 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:02:42,492 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:02:42,493 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:02:42,493 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:02:42,537 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 8 treesize of output 7 [2021-11-25 18:02:42,586 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 16 treesize of output 12 [2021-11-25 18:02:42,644 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 16 treesize of output 12 [2021-11-25 18:02:42,679 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 16 treesize of output 12 [2021-11-25 18:02:42,806 INFO L354 Elim1Store]: treesize reduction 51, result has 33.8 percent of original size [2021-11-25 18:02:42,807 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 2 case distinctions, treesize of input 50 treesize of output 41 [2021-11-25 18:02:42,952 INFO L354 Elim1Store]: treesize reduction 34, result has 41.4 percent of original size [2021-11-25 18:02:42,953 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 24 treesize of output 36 [2021-11-25 18:02:43,026 INFO L354 Elim1Store]: treesize reduction 34, result has 41.4 percent of original size [2021-11-25 18:02:43,026 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 24 treesize of output 36 [2021-11-25 18:02:43,108 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:02:44,635 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '623#(and (= |ULTIMATE.start_main_#t~malloc3#1.offset| 0) (< (select |#length| |ULTIMATE.start_main_~a~0#1.base|) (+ |ULTIMATE.start_main_~a~0#1.offset| 4)) (or (and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc3#1.base|) (<= 0 |ULTIMATE.start_main_~a~0#1.offset|) (<= |ULTIMATE.start_main_~arr~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~a~0#1.base|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= 0 |ULTIMATE.start_main_~arr~0#1.base|) (<= 1 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~arr~0#1.offset|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1.offset| 0)) (and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc3#1.base|) (<= |ULTIMATE.start_main_~arr~0#1.offset| 0) (<= 4 |ULTIMATE.start_main_~a~0#1.offset|) (<= 0 |ULTIMATE.start_main_~a~0#1.base|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= 0 |ULTIMATE.start_main_~arr~0#1.base|) (<= 1 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~arr~0#1.offset|) (<= 0 |#StackHeapBarrier|))) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2021-11-25 18:02:44,635 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:02:44,635 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:02:44,635 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8, 8] total 19 [2021-11-25 18:02:44,636 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1571462919] [2021-11-25 18:02:44,636 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:02:44,636 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-25 18:02:44,636 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:02:44,636 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-25 18:02:44,637 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=701, Unknown=0, NotChecked=0, Total=812 [2021-11-25 18:02:44,637 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand has 19 states, 19 states have (on average 1.368421052631579) internal successors, (26), 19 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:02:44,832 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:02:44,833 INFO L93 Difference]: Finished difference Result 19 states and 20 transitions. [2021-11-25 18:02:44,833 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-25 18:02:44,833 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.368421052631579) internal successors, (26), 19 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-11-25 18:02:44,833 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:02:44,834 INFO L225 Difference]: With dead ends: 19 [2021-11-25 18:02:44,834 INFO L226 Difference]: Without dead ends: 16 [2021-11-25 18:02:44,834 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 320 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=162, Invalid=894, Unknown=0, NotChecked=0, Total=1056 [2021-11-25 18:02:44,837 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 22 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 109 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 116 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 109 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:02:44,837 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 12 Invalid, 116 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 109 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:02:44,838 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2021-11-25 18:02:44,840 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2021-11-25 18:02:44,840 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 14 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:02:44,840 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2021-11-25 18:02:44,840 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 12 [2021-11-25 18:02:44,841 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:02:44,841 INFO L470 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2021-11-25 18:02:44,841 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.368421052631579) internal successors, (26), 19 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:02:44,841 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2021-11-25 18:02:44,841 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-25 18:02:44,842 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:02:44,842 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:02:44,870 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e9dd74b5-b196-428e-8e79-6da2d4c1d5b8/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-25 18:02:45,058 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e9dd74b5-b196-428e-8e79-6da2d4c1d5b8/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:02:45,059 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-25 18:02:45,059 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:02:45,059 INFO L85 PathProgramCache]: Analyzing trace with hash -682532146, now seen corresponding path program 2 times [2021-11-25 18:02:45,059 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:02:45,059 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1493106332] [2021-11-25 18:02:45,059 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:02:45,060 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:02:45,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:02:45,195 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:02:45,195 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:02:45,195 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1493106332] [2021-11-25 18:02:45,196 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1493106332] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:02:45,196 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1390563212] [2021-11-25 18:02:45,196 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:02:45,196 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:02:45,196 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e9dd74b5-b196-428e-8e79-6da2d4c1d5b8/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:02:45,197 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e9dd74b5-b196-428e-8e79-6da2d4c1d5b8/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:02:45,222 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e9dd74b5-b196-428e-8e79-6da2d4c1d5b8/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-25 18:02:45,266 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-25 18:02:45,266 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:02:45,267 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-25 18:02:45,271 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:02:45,286 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 18:02:45,634 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 18:02:45,635 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 23 treesize of output 23 [2021-11-25 18:02:46,346 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 18:02:46,346 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:02:46,503 INFO L354 Elim1Store]: treesize reduction 3, result has 81.3 percent of original size [2021-11-25 18:02:46,505 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 16 treesize of output 17 [2021-11-25 18:02:46,864 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 18:02:46,864 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1390563212] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:02:46,864 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1867623193] [2021-11-25 18:02:46,867 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-25 18:02:46,867 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:02:46,867 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:02:46,868 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:02:46,868 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:02:46,897 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 8 treesize of output 7 [2021-11-25 18:02:46,965 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 16 treesize of output 12 [2021-11-25 18:02:47,011 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 16 treesize of output 12 [2021-11-25 18:02:47,039 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 16 treesize of output 12 [2021-11-25 18:02:47,153 INFO L354 Elim1Store]: treesize reduction 51, result has 33.8 percent of original size [2021-11-25 18:02:47,153 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 2 case distinctions, treesize of input 50 treesize of output 41 [2021-11-25 18:02:47,259 INFO L354 Elim1Store]: treesize reduction 34, result has 41.4 percent of original size [2021-11-25 18:02:47,259 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 24 treesize of output 36 [2021-11-25 18:02:47,322 INFO L354 Elim1Store]: treesize reduction 34, result has 41.4 percent of original size [2021-11-25 18:02:47,322 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 24 treesize of output 36 [2021-11-25 18:02:47,406 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:02:48,880 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '777#(and (= |ULTIMATE.start_main_#t~malloc3#1.offset| 0) (< (select |#length| |ULTIMATE.start_main_~a~0#1.base|) (+ |ULTIMATE.start_main_~a~0#1.offset| 4)) (or (and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc3#1.base|) (<= 0 |ULTIMATE.start_main_~a~0#1.offset|) (<= |ULTIMATE.start_main_~arr~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~a~0#1.base|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= 0 |ULTIMATE.start_main_~arr~0#1.base|) (<= 1 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~arr~0#1.offset|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1.offset| 0)) (and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc3#1.base|) (<= |ULTIMATE.start_main_~arr~0#1.offset| 0) (<= 4 |ULTIMATE.start_main_~a~0#1.offset|) (<= 0 |ULTIMATE.start_main_~a~0#1.base|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= 0 |ULTIMATE.start_main_~arr~0#1.base|) (<= 1 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~arr~0#1.offset|) (<= 0 |#StackHeapBarrier|))) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2021-11-25 18:02:48,880 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:02:48,880 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:02:48,880 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 8, 8] total 22 [2021-11-25 18:02:48,880 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1640944857] [2021-11-25 18:02:48,880 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:02:48,881 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-25 18:02:48,881 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:02:48,882 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-25 18:02:48,882 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=963, Unknown=0, NotChecked=0, Total=1122 [2021-11-25 18:02:48,883 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand has 24 states, 23 states have (on average 1.7391304347826086) internal successors, (40), 23 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:02:49,588 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:02:49,589 INFO L93 Difference]: Finished difference Result 32 states and 33 transitions. [2021-11-25 18:02:49,589 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-25 18:02:49,589 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 1.7391304347826086) internal successors, (40), 23 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2021-11-25 18:02:49,590 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:02:49,590 INFO L225 Difference]: With dead ends: 32 [2021-11-25 18:02:49,590 INFO L226 Difference]: Without dead ends: 32 [2021-11-25 18:02:49,591 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 472 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=321, Invalid=1659, Unknown=0, NotChecked=0, Total=1980 [2021-11-25 18:02:49,592 INFO L933 BasicCegarLoop]: 0 mSDtfsCounter, 110 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 167 mSolverCounterSat, 46 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 110 SdHoareTripleChecker+Valid, 4 SdHoareTripleChecker+Invalid, 213 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 46 IncrementalHoareTripleChecker+Valid, 167 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:02:49,593 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [110 Valid, 4 Invalid, 213 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [46 Valid, 167 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 18:02:49,593 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-11-25 18:02:49,602 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 27. [2021-11-25 18:02:49,603 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.0769230769230769) internal successors, (28), 26 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 18:02:49,604 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2021-11-25 18:02:49,605 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 14 [2021-11-25 18:02:49,605 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:02:49,605 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2021-11-25 18:02:49,606 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 23 states have (on average 1.7391304347826086) internal successors, (40), 23 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:02:49,606 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2021-11-25 18:02:49,607 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-25 18:02:49,607 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:02:49,608 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1] [2021-11-25 18:02:49,651 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e9dd74b5-b196-428e-8e79-6da2d4c1d5b8/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-25 18:02:49,822 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e9dd74b5-b196-428e-8e79-6da2d4c1d5b8/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-25 18:02:49,823 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-25 18:02:49,823 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:02:49,823 INFO L85 PathProgramCache]: Analyzing trace with hash -1396547736, now seen corresponding path program 3 times [2021-11-25 18:02:49,823 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:02:49,823 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [266892830] [2021-11-25 18:02:49,824 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:02:49,824 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:02:49,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:02:49,986 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 14 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:02:49,986 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:02:49,986 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [266892830] [2021-11-25 18:02:49,986 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [266892830] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:02:49,986 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1935032764] [2021-11-25 18:02:49,987 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 18:02:49,987 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:02:49,987 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e9dd74b5-b196-428e-8e79-6da2d4c1d5b8/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:02:49,991 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e9dd74b5-b196-428e-8e79-6da2d4c1d5b8/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:02:50,021 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e9dd74b5-b196-428e-8e79-6da2d4c1d5b8/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-25 18:02:50,094 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 18:02:50,094 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:02:50,096 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-25 18:02:50,098 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:02:50,310 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 6 treesize of output 5 [2021-11-25 18:02:50,380 INFO L354 Elim1Store]: treesize reduction 12, result has 20.0 percent of original size [2021-11-25 18:02:50,386 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 22 treesize of output 10 [2021-11-25 18:02:50,417 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 14 proven. 7 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 18:02:50,417 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:02:50,491 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 40 treesize of output 31 [2021-11-25 18:02:50,497 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 18:02:50,497 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 31 treesize of output 31 [2021-11-25 18:02:50,743 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 14 proven. 7 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 18:02:50,743 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1935032764] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:02:50,743 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2086523916] [2021-11-25 18:02:50,746 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-25 18:02:50,747 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:02:50,747 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:02:50,747 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:02:50,747 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:02:50,784 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-25 18:02:50,830 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 16 treesize of output 12 [2021-11-25 18:02:50,871 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 16 treesize of output 12 [2021-11-25 18:02:50,898 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 16 treesize of output 12 [2021-11-25 18:02:51,022 INFO L354 Elim1Store]: treesize reduction 51, result has 33.8 percent of original size [2021-11-25 18:02:51,022 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 2 case distinctions, treesize of input 50 treesize of output 41 [2021-11-25 18:02:51,155 INFO L354 Elim1Store]: treesize reduction 34, result has 41.4 percent of original size [2021-11-25 18:02:51,156 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 24 treesize of output 36 [2021-11-25 18:02:51,217 INFO L354 Elim1Store]: treesize reduction 34, result has 41.4 percent of original size [2021-11-25 18:02:51,218 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 24 treesize of output 36 [2021-11-25 18:02:51,289 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:02:52,588 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1042#(and (= |ULTIMATE.start_main_#t~malloc3#1.offset| 0) (< (select |#length| |ULTIMATE.start_main_~a~0#1.base|) (+ |ULTIMATE.start_main_~a~0#1.offset| 4)) (or (and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc3#1.base|) (<= 0 |ULTIMATE.start_main_~a~0#1.offset|) (<= |ULTIMATE.start_main_~arr~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~a~0#1.base|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= 0 |ULTIMATE.start_main_~arr~0#1.base|) (<= 1 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~arr~0#1.offset|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1.offset| 0)) (and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc3#1.base|) (<= |ULTIMATE.start_main_~arr~0#1.offset| 0) (<= 4 |ULTIMATE.start_main_~a~0#1.offset|) (<= 0 |ULTIMATE.start_main_~a~0#1.base|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= 0 |ULTIMATE.start_main_~arr~0#1.base|) (<= 1 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~arr~0#1.offset|) (<= 0 |#StackHeapBarrier|))) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2021-11-25 18:02:52,588 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:02:52,589 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:02:52,589 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 10, 10] total 24 [2021-11-25 18:02:52,589 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2021156292] [2021-11-25 18:02:52,589 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:02:52,590 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-25 18:02:52,590 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:02:52,590 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-25 18:02:52,591 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=1023, Unknown=0, NotChecked=0, Total=1122 [2021-11-25 18:02:52,591 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand has 24 states, 24 states have (on average 2.375) internal successors, (57), 24 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 18:02:53,040 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:02:53,040 INFO L93 Difference]: Finished difference Result 39 states and 40 transitions. [2021-11-25 18:02:53,041 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-25 18:02:53,041 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.375) internal successors, (57), 24 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 18:02:53,041 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:02:53,041 INFO L225 Difference]: With dead ends: 39 [2021-11-25 18:02:53,042 INFO L226 Difference]: Without dead ends: 30 [2021-11-25 18:02:53,042 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 377 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=188, Invalid=1704, Unknown=0, NotChecked=0, Total=1892 [2021-11-25 18:02:53,043 INFO L933 BasicCegarLoop]: 1 mSDtfsCounter, 47 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 223 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 234 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 223 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:02:53,044 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [47 Valid, 14 Invalid, 234 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 223 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:02:53,044 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-11-25 18:02:53,046 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2021-11-25 18:02:53,047 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 28 states have (on average 1.0714285714285714) internal successors, (30), 28 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:02:53,047 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2021-11-25 18:02:53,047 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 26 [2021-11-25 18:02:53,048 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:02:53,048 INFO L470 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2021-11-25 18:02:53,048 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 2.375) internal successors, (57), 24 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 18:02:53,048 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2021-11-25 18:02:53,049 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-25 18:02:53,049 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:02:53,049 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1] [2021-11-25 18:02:53,069 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e9dd74b5-b196-428e-8e79-6da2d4c1d5b8/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-25 18:02:53,249 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e9dd74b5-b196-428e-8e79-6da2d4c1d5b8/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:02:53,250 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-25 18:02:53,250 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:02:53,250 INFO L85 PathProgramCache]: Analyzing trace with hash 2072503701, now seen corresponding path program 4 times [2021-11-25 18:02:53,250 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:02:53,250 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [273777582] [2021-11-25 18:02:53,250 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:02:53,250 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:02:53,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:02:53,600 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 9 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:02:53,601 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:02:53,601 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [273777582] [2021-11-25 18:02:53,601 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [273777582] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:02:53,601 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1117646976] [2021-11-25 18:02:53,601 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 18:02:53,601 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:02:53,602 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e9dd74b5-b196-428e-8e79-6da2d4c1d5b8/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:02:53,602 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e9dd74b5-b196-428e-8e79-6da2d4c1d5b8/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:02:53,637 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e9dd74b5-b196-428e-8e79-6da2d4c1d5b8/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-25 18:02:53,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:02:53,690 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-25 18:02:53,692 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:02:53,936 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 18:02:54,030 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 18:02:54,079 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 18:02:54,094 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 9 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:02:54,095 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:02:54,211 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 18:02:54,213 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 362 treesize of output 350 [2021-11-25 18:02:56,010 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 15 [2021-11-25 18:02:56,048 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 18:02:56,048 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 496 treesize of output 431 [2021-11-25 18:02:56,429 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 9 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:02:56,429 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1117646976] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:02:56,429 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1933272329] [2021-11-25 18:02:56,432 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-25 18:02:56,432 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:02:56,432 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:02:56,432 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:02:56,432 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:02:56,457 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 8 treesize of output 7 [2021-11-25 18:02:56,493 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 11 treesize of output 7 [2021-11-25 18:02:56,526 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 16 treesize of output 12 [2021-11-25 18:02:56,551 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 16 treesize of output 12 [2021-11-25 18:02:56,658 INFO L354 Elim1Store]: treesize reduction 51, result has 33.8 percent of original size [2021-11-25 18:02:56,658 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 2 case distinctions, treesize of input 50 treesize of output 41 [2021-11-25 18:02:56,760 INFO L354 Elim1Store]: treesize reduction 34, result has 41.4 percent of original size [2021-11-25 18:02:56,760 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 24 treesize of output 36 [2021-11-25 18:02:56,833 INFO L354 Elim1Store]: treesize reduction 34, result has 41.4 percent of original size [2021-11-25 18:02:56,833 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 24 treesize of output 36 [2021-11-25 18:02:56,903 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:02:58,273 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1336#(and (= |ULTIMATE.start_main_#t~malloc3#1.offset| 0) (< (select |#length| |ULTIMATE.start_main_~a~0#1.base|) (+ |ULTIMATE.start_main_~a~0#1.offset| 4)) (or (and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc3#1.base|) (<= 0 |ULTIMATE.start_main_~a~0#1.offset|) (<= |ULTIMATE.start_main_~arr~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~a~0#1.base|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= 0 |ULTIMATE.start_main_~arr~0#1.base|) (<= 1 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~arr~0#1.offset|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1.offset| 0)) (and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc3#1.base|) (<= |ULTIMATE.start_main_~arr~0#1.offset| 0) (<= 4 |ULTIMATE.start_main_~a~0#1.offset|) (<= 0 |ULTIMATE.start_main_~a~0#1.base|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= 0 |ULTIMATE.start_main_~arr~0#1.base|) (<= 1 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~arr~0#1.offset|) (<= 0 |#StackHeapBarrier|))) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2021-11-25 18:02:58,273 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:02:58,273 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:02:58,273 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13, 13] total 33 [2021-11-25 18:02:58,273 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1197980932] [2021-11-25 18:02:58,273 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:02:58,274 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-25 18:02:58,274 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:02:58,274 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-25 18:02:58,275 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=186, Invalid=1706, Unknown=0, NotChecked=0, Total=1892 [2021-11-25 18:02:58,275 INFO L87 Difference]: Start difference. First operand 29 states and 30 transitions. Second operand has 34 states, 34 states have (on average 2.0588235294117645) internal successors, (70), 33 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:02:58,833 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:02:58,833 INFO L93 Difference]: Finished difference Result 47 states and 48 transitions. [2021-11-25 18:02:58,833 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-25 18:02:58,833 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 2.0588235294117645) internal successors, (70), 33 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2021-11-25 18:02:58,834 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:02:58,834 INFO L225 Difference]: With dead ends: 47 [2021-11-25 18:02:58,834 INFO L226 Difference]: Without dead ends: 32 [2021-11-25 18:02:58,835 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 51 SyntacticMatches, 2 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 907 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=291, Invalid=2571, Unknown=0, NotChecked=0, Total=2862 [2021-11-25 18:02:58,836 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 73 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 369 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 410 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 369 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 21 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:02:58,836 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [73 Valid, 31 Invalid, 410 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 369 Invalid, 0 Unknown, 21 Unchecked, 0.2s Time] [2021-11-25 18:02:58,837 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-11-25 18:02:58,839 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2021-11-25 18:02:58,839 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 30 states have (on average 1.0666666666666667) internal successors, (32), 30 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 18:02:58,839 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2021-11-25 18:02:58,840 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 28 [2021-11-25 18:02:58,840 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:02:58,840 INFO L470 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2021-11-25 18:02:58,840 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 2.0588235294117645) internal successors, (70), 33 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:02:58,840 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2021-11-25 18:02:58,841 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-25 18:02:58,841 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:02:58,841 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1] [2021-11-25 18:02:58,862 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e9dd74b5-b196-428e-8e79-6da2d4c1d5b8/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-25 18:02:59,046 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e9dd74b5-b196-428e-8e79-6da2d4c1d5b8/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-25 18:02:59,047 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-25 18:02:59,047 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:02:59,047 INFO L85 PathProgramCache]: Analyzing trace with hash -1358654334, now seen corresponding path program 5 times [2021-11-25 18:02:59,047 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:02:59,048 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [281915319] [2021-11-25 18:02:59,048 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:02:59,048 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:02:59,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:02:59,202 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 4 proven. 33 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:02:59,202 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:02:59,202 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [281915319] [2021-11-25 18:02:59,202 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [281915319] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:02:59,202 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [944607846] [2021-11-25 18:02:59,202 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:02:59,202 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:02:59,203 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e9dd74b5-b196-428e-8e79-6da2d4c1d5b8/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:02:59,213 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e9dd74b5-b196-428e-8e79-6da2d4c1d5b8/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:02:59,214 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e9dd74b5-b196-428e-8e79-6da2d4c1d5b8/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-25 18:02:59,291 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-25 18:02:59,292 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:02:59,293 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-25 18:02:59,296 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:02:59,302 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 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-25 18:02:59,834 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 18:02:59,835 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 23 treesize of output 23 [2021-11-25 18:03:00,005 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 18:03:00,005 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:03:00,193 INFO L354 Elim1Store]: treesize reduction 3, result has 81.3 percent of original size [2021-11-25 18:03:00,193 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 16 treesize of output 17 [2021-11-25 18:03:00,746 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 18:03:00,746 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [944607846] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:03:00,747 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1097087311] [2021-11-25 18:03:00,748 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-25 18:03:00,748 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:03:00,748 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:03:00,749 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:03:00,749 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:03:00,780 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 8 treesize of output 7 [2021-11-25 18:03:00,813 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 16 treesize of output 12 [2021-11-25 18:03:00,862 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 16 treesize of output 12 [2021-11-25 18:03:00,883 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 16 treesize of output 12 [2021-11-25 18:03:01,005 INFO L354 Elim1Store]: treesize reduction 51, result has 33.8 percent of original size [2021-11-25 18:03:01,006 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 2 case distinctions, treesize of input 50 treesize of output 41 [2021-11-25 18:03:01,108 INFO L354 Elim1Store]: treesize reduction 34, result has 41.4 percent of original size [2021-11-25 18:03:01,108 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 24 treesize of output 36 [2021-11-25 18:03:01,164 INFO L354 Elim1Store]: treesize reduction 34, result has 41.4 percent of original size [2021-11-25 18:03:01,164 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 24 treesize of output 36 [2021-11-25 18:03:01,240 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:03:02,580 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1650#(and (= |ULTIMATE.start_main_#t~malloc3#1.offset| 0) (< (select |#length| |ULTIMATE.start_main_~a~0#1.base|) (+ |ULTIMATE.start_main_~a~0#1.offset| 4)) (or (and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc3#1.base|) (<= 0 |ULTIMATE.start_main_~a~0#1.offset|) (<= |ULTIMATE.start_main_~arr~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~a~0#1.base|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= 0 |ULTIMATE.start_main_~arr~0#1.base|) (<= 1 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~arr~0#1.offset|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1.offset| 0)) (and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc3#1.base|) (<= |ULTIMATE.start_main_~arr~0#1.offset| 0) (<= 4 |ULTIMATE.start_main_~a~0#1.offset|) (<= 0 |ULTIMATE.start_main_~a~0#1.base|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= 0 |ULTIMATE.start_main_~arr~0#1.base|) (<= 1 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~arr~0#1.offset|) (<= 0 |#StackHeapBarrier|))) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2021-11-25 18:03:02,581 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:03:02,581 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:03:02,581 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10, 11] total 30 [2021-11-25 18:03:02,581 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1003634311] [2021-11-25 18:03:02,581 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:03:02,582 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-25 18:03:02,582 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:03:02,582 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-25 18:03:02,583 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=208, Invalid=1514, Unknown=0, NotChecked=0, Total=1722 [2021-11-25 18:03:02,583 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand has 32 states, 31 states have (on average 2.5806451612903225) internal successors, (80), 31 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:03:04,277 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:03:04,277 INFO L93 Difference]: Finished difference Result 60 states and 61 transitions. [2021-11-25 18:03:04,277 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-25 18:03:04,278 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 31 states have (on average 2.5806451612903225) internal successors, (80), 31 states have internal predecessors, (80), 0 states have call successors, (0), 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 30 [2021-11-25 18:03:04,280 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:03:04,281 INFO L225 Difference]: With dead ends: 60 [2021-11-25 18:03:04,282 INFO L226 Difference]: Without dead ends: 60 [2021-11-25 18:03:04,284 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1100 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=654, Invalid=3768, Unknown=0, NotChecked=0, Total=4422 [2021-11-25 18:03:04,288 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 260 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 467 mSolverCounterSat, 90 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 260 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 557 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 90 IncrementalHoareTripleChecker+Valid, 467 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 18:03:04,289 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [260 Valid, 21 Invalid, 557 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [90 Valid, 467 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 18:03:04,290 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-11-25 18:03:04,302 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 55. [2021-11-25 18:03:04,303 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 54 states have (on average 1.037037037037037) internal successors, (56), 54 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:03:04,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 56 transitions. [2021-11-25 18:03:04,306 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 56 transitions. Word has length 30 [2021-11-25 18:03:04,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:03:04,306 INFO L470 AbstractCegarLoop]: Abstraction has 55 states and 56 transitions. [2021-11-25 18:03:04,307 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 31 states have (on average 2.5806451612903225) internal successors, (80), 31 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:03:04,307 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 56 transitions. [2021-11-25 18:03:04,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-25 18:03:04,311 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:03:04,311 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 7, 4, 4, 1, 1, 1, 1] [2021-11-25 18:03:04,336 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e9dd74b5-b196-428e-8e79-6da2d4c1d5b8/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-25 18:03:04,512 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e9dd74b5-b196-428e-8e79-6da2d4c1d5b8/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:03:04,512 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-25 18:03:04,512 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:03:04,512 INFO L85 PathProgramCache]: Analyzing trace with hash 785488566, now seen corresponding path program 6 times [2021-11-25 18:03:04,512 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:03:04,513 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [928726990] [2021-11-25 18:03:04,513 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:03:04,513 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:03:04,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:03:04,763 INFO L134 CoverageAnalysis]: Checked inductivity of 149 backedges. 102 proven. 41 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 18:03:04,763 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:03:04,763 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [928726990] [2021-11-25 18:03:04,764 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [928726990] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:03:04,764 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1278607921] [2021-11-25 18:03:04,764 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 18:03:04,764 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:03:04,764 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e9dd74b5-b196-428e-8e79-6da2d4c1d5b8/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:03:04,771 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e9dd74b5-b196-428e-8e79-6da2d4c1d5b8/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:03:04,792 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e9dd74b5-b196-428e-8e79-6da2d4c1d5b8/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-25 18:03:04,921 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 18:03:04,921 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:03:04,923 INFO L263 TraceCheckSpWp]: Trace formula consists of 349 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-25 18:03:04,926 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:03:04,941 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 18:03:05,337 INFO L134 CoverageAnalysis]: Checked inductivity of 149 backedges. 115 proven. 16 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-25 18:03:05,338 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:03:05,701 INFO L134 CoverageAnalysis]: Checked inductivity of 149 backedges. 115 proven. 16 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-25 18:03:05,701 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1278607921] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:03:05,701 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1082478244] [2021-11-25 18:03:05,703 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-25 18:03:05,703 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:03:05,704 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:03:05,704 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:03:05,704 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:03:05,725 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 8 treesize of output 7 [2021-11-25 18:03:05,754 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 16 treesize of output 12 [2021-11-25 18:03:05,792 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 16 treesize of output 12 [2021-11-25 18:03:05,812 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 16 treesize of output 12 [2021-11-25 18:03:05,898 INFO L354 Elim1Store]: treesize reduction 51, result has 33.8 percent of original size [2021-11-25 18:03:05,899 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 2 case distinctions, treesize of input 50 treesize of output 41 [2021-11-25 18:03:05,979 INFO L354 Elim1Store]: treesize reduction 34, result has 41.4 percent of original size [2021-11-25 18:03:05,979 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 24 treesize of output 36 [2021-11-25 18:03:06,041 INFO L354 Elim1Store]: treesize reduction 34, result has 41.4 percent of original size [2021-11-25 18:03:06,041 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 24 treesize of output 36 [2021-11-25 18:03:06,090 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:03:07,320 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2179#(and (= |ULTIMATE.start_main_#t~malloc3#1.offset| 0) (< (select |#length| |ULTIMATE.start_main_~a~0#1.base|) (+ |ULTIMATE.start_main_~a~0#1.offset| 4)) (or (and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc3#1.base|) (<= 0 |ULTIMATE.start_main_~a~0#1.offset|) (<= |ULTIMATE.start_main_~arr~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~a~0#1.base|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= 0 |ULTIMATE.start_main_~arr~0#1.base|) (<= 1 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~arr~0#1.offset|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1.offset| 0)) (and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc3#1.base|) (<= |ULTIMATE.start_main_~arr~0#1.offset| 0) (<= 4 |ULTIMATE.start_main_~a~0#1.offset|) (<= 0 |ULTIMATE.start_main_~a~0#1.base|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= 0 |ULTIMATE.start_main_~arr~0#1.base|) (<= 1 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~arr~0#1.offset|) (<= 0 |#StackHeapBarrier|))) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2021-11-25 18:03:07,320 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:03:07,320 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:03:07,320 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 35 [2021-11-25 18:03:07,320 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1033406211] [2021-11-25 18:03:07,321 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:03:07,321 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-11-25 18:03:07,321 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:03:07,321 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-11-25 18:03:07,322 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=338, Invalid=1732, Unknown=0, NotChecked=0, Total=2070 [2021-11-25 18:03:07,322 INFO L87 Difference]: Start difference. First operand 55 states and 56 transitions. Second operand has 36 states, 36 states have (on average 3.361111111111111) internal successors, (121), 35 states have internal predecessors, (121), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:03:07,817 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:03:07,817 INFO L93 Difference]: Finished difference Result 83 states and 84 transitions. [2021-11-25 18:03:07,817 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-25 18:03:07,817 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 3.361111111111111) internal successors, (121), 35 states have internal predecessors, (121), 0 states have call successors, (0), 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 54 [2021-11-25 18:03:07,818 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:03:07,818 INFO L225 Difference]: With dead ends: 83 [2021-11-25 18:03:07,818 INFO L226 Difference]: Without dead ends: 58 [2021-11-25 18:03:07,820 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 185 GetRequests, 130 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 966 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=538, Invalid=2654, Unknown=0, NotChecked=0, Total=3192 [2021-11-25 18:03:07,820 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 110 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 301 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 110 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 333 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 301 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:03:07,821 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [110 Valid, 48 Invalid, 333 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 301 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 18:03:07,821 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2021-11-25 18:03:07,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2021-11-25 18:03:07,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 56 states have (on average 1.0357142857142858) internal successors, (58), 56 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:03:07,825 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 58 transitions. [2021-11-25 18:03:07,825 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 58 transitions. Word has length 54 [2021-11-25 18:03:07,825 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:03:07,825 INFO L470 AbstractCegarLoop]: Abstraction has 57 states and 58 transitions. [2021-11-25 18:03:07,825 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 3.361111111111111) internal successors, (121), 35 states have internal predecessors, (121), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:03:07,826 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 58 transitions. [2021-11-25 18:03:07,826 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-25 18:03:07,827 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:03:07,827 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 7, 5, 5, 1, 1, 1, 1] [2021-11-25 18:03:07,848 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e9dd74b5-b196-428e-8e79-6da2d4c1d5b8/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-25 18:03:08,030 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e9dd74b5-b196-428e-8e79-6da2d4c1d5b8/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-25 18:03:08,031 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-25 18:03:08,031 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:03:08,031 INFO L85 PathProgramCache]: Analyzing trace with hash -390247581, now seen corresponding path program 7 times [2021-11-25 18:03:08,031 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:03:08,031 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [457911472] [2021-11-25 18:03:08,031 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:03:08,031 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:03:08,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:03:08,318 INFO L134 CoverageAnalysis]: Checked inductivity of 158 backedges. 102 proven. 50 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 18:03:08,318 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:03:08,318 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [457911472] [2021-11-25 18:03:08,318 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [457911472] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:03:08,318 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [862952677] [2021-11-25 18:03:08,318 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 18:03:08,319 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:03:08,319 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e9dd74b5-b196-428e-8e79-6da2d4c1d5b8/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:03:08,320 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e9dd74b5-b196-428e-8e79-6da2d4c1d5b8/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:03:08,344 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e9dd74b5-b196-428e-8e79-6da2d4c1d5b8/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-25 18:03:08,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:03:08,427 INFO L263 TraceCheckSpWp]: Trace formula consists of 362 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-25 18:03:08,430 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:03:08,436 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 18:03:08,912 INFO L134 CoverageAnalysis]: Checked inductivity of 158 backedges. 127 proven. 25 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 18:03:08,912 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:03:09,299 INFO L134 CoverageAnalysis]: Checked inductivity of 158 backedges. 122 proven. 30 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 18:03:09,299 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [862952677] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:03:09,299 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [122961554] [2021-11-25 18:03:09,301 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-25 18:03:09,301 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:03:09,301 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:03:09,301 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:03:09,302 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:03:09,335 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 8 treesize of output 7 [2021-11-25 18:03:09,379 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 16 treesize of output 12 [2021-11-25 18:03:09,413 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 16 treesize of output 12 [2021-11-25 18:03:09,434 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 16 treesize of output 12 [2021-11-25 18:03:09,530 INFO L354 Elim1Store]: treesize reduction 51, result has 33.8 percent of original size [2021-11-25 18:03:09,530 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 2 case distinctions, treesize of input 50 treesize of output 41 [2021-11-25 18:03:09,603 INFO L354 Elim1Store]: treesize reduction 34, result has 41.4 percent of original size [2021-11-25 18:03:09,603 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 24 treesize of output 36 [2021-11-25 18:03:09,668 INFO L354 Elim1Store]: treesize reduction 34, result has 41.4 percent of original size [2021-11-25 18:03:09,668 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 24 treesize of output 36 [2021-11-25 18:03:09,738 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:03:10,995 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2724#(and (= |ULTIMATE.start_main_#t~malloc3#1.offset| 0) (< (select |#length| |ULTIMATE.start_main_~a~0#1.base|) (+ |ULTIMATE.start_main_~a~0#1.offset| 4)) (or (and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc3#1.base|) (<= 0 |ULTIMATE.start_main_~a~0#1.offset|) (<= |ULTIMATE.start_main_~arr~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~a~0#1.base|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= 0 |ULTIMATE.start_main_~arr~0#1.base|) (<= 1 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~arr~0#1.offset|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1.offset| 0)) (and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc3#1.base|) (<= |ULTIMATE.start_main_~arr~0#1.offset| 0) (<= 4 |ULTIMATE.start_main_~a~0#1.offset|) (<= 0 |ULTIMATE.start_main_~a~0#1.base|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= 0 |ULTIMATE.start_main_~arr~0#1.base|) (<= 1 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~arr~0#1.offset|) (<= 0 |#StackHeapBarrier|))) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2021-11-25 18:03:10,995 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:03:10,996 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:03:10,996 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 15, 15] total 42 [2021-11-25 18:03:10,996 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1833757418] [2021-11-25 18:03:10,996 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:03:10,996 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2021-11-25 18:03:10,996 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:03:10,997 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-11-25 18:03:10,998 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=387, Invalid=2369, Unknown=0, NotChecked=0, Total=2756 [2021-11-25 18:03:10,998 INFO L87 Difference]: Start difference. First operand 57 states and 58 transitions. Second operand has 43 states, 43 states have (on average 3.2325581395348837) internal successors, (139), 42 states have internal predecessors, (139), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:03:11,684 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:03:11,684 INFO L93 Difference]: Finished difference Result 91 states and 92 transitions. [2021-11-25 18:03:11,684 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-25 18:03:11,685 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 3.2325581395348837) internal successors, (139), 42 states have internal predecessors, (139), 0 states have call successors, (0), 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 56 [2021-11-25 18:03:11,685 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:03:11,685 INFO L225 Difference]: With dead ends: 91 [2021-11-25 18:03:11,685 INFO L226 Difference]: Without dead ends: 60 [2021-11-25 18:03:11,687 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 194 GetRequests, 130 SyntacticMatches, 0 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1344 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=667, Invalid=3623, Unknown=0, NotChecked=0, Total=4290 [2021-11-25 18:03:11,688 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 81 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 353 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 81 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 382 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 353 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:03:11,688 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [81 Valid, 52 Invalid, 382 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 353 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 18:03:11,689 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-11-25 18:03:11,691 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2021-11-25 18:03:11,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 58 states have (on average 1.0344827586206897) internal successors, (60), 58 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:03:11,692 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 60 transitions. [2021-11-25 18:03:11,692 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 60 transitions. Word has length 56 [2021-11-25 18:03:11,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:03:11,692 INFO L470 AbstractCegarLoop]: Abstraction has 59 states and 60 transitions. [2021-11-25 18:03:11,693 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 3.2325581395348837) internal successors, (139), 42 states have internal predecessors, (139), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:03:11,693 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 60 transitions. [2021-11-25 18:03:11,694 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-11-25 18:03:11,694 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:03:11,694 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 7, 6, 6, 1, 1, 1, 1] [2021-11-25 18:03:11,722 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e9dd74b5-b196-428e-8e79-6da2d4c1d5b8/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-25 18:03:11,914 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e9dd74b5-b196-428e-8e79-6da2d4c1d5b8/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:03:11,915 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-25 18:03:11,915 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:03:11,915 INFO L85 PathProgramCache]: Analyzing trace with hash -696286000, now seen corresponding path program 8 times [2021-11-25 18:03:11,915 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:03:11,915 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1526544451] [2021-11-25 18:03:11,915 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:03:11,915 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:03:11,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:03:12,163 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 102 proven. 67 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:03:12,164 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:03:12,164 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1526544451] [2021-11-25 18:03:12,164 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1526544451] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:03:12,164 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1231921074] [2021-11-25 18:03:12,164 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:03:12,164 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:03:12,165 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e9dd74b5-b196-428e-8e79-6da2d4c1d5b8/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:03:12,167 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e9dd74b5-b196-428e-8e79-6da2d4c1d5b8/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:03:12,168 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e9dd74b5-b196-428e-8e79-6da2d4c1d5b8/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-25 18:03:12,352 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-11-25 18:03:12,353 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:03:12,355 INFO L263 TraceCheckSpWp]: Trace formula consists of 375 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-25 18:03:12,359 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:03:12,369 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 18:03:12,929 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 133 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:03:12,929 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:03:13,354 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 133 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:03:13,354 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1231921074] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:03:13,354 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1611068499] [2021-11-25 18:03:13,356 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-25 18:03:13,357 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:03:13,357 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:03:13,357 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:03:13,357 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:03:13,385 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 8 treesize of output 7 [2021-11-25 18:03:13,428 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 16 treesize of output 12 [2021-11-25 18:03:13,469 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 16 treesize of output 12 [2021-11-25 18:03:13,486 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 16 treesize of output 12 [2021-11-25 18:03:13,575 INFO L354 Elim1Store]: treesize reduction 51, result has 33.8 percent of original size [2021-11-25 18:03:13,575 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 2 case distinctions, treesize of input 50 treesize of output 41 [2021-11-25 18:03:13,654 INFO L354 Elim1Store]: treesize reduction 34, result has 41.4 percent of original size [2021-11-25 18:03:13,654 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 24 treesize of output 36 [2021-11-25 18:03:13,719 INFO L354 Elim1Store]: treesize reduction 34, result has 41.4 percent of original size [2021-11-25 18:03:13,720 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 24 treesize of output 36 [2021-11-25 18:03:13,773 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:03:15,060 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3299#(and (= |ULTIMATE.start_main_#t~malloc3#1.offset| 0) (< (select |#length| |ULTIMATE.start_main_~a~0#1.base|) (+ |ULTIMATE.start_main_~a~0#1.offset| 4)) (or (and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc3#1.base|) (<= 0 |ULTIMATE.start_main_~a~0#1.offset|) (<= |ULTIMATE.start_main_~arr~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~a~0#1.base|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= 0 |ULTIMATE.start_main_~arr~0#1.base|) (<= 1 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~arr~0#1.offset|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1.offset| 0)) (and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc3#1.base|) (<= |ULTIMATE.start_main_~arr~0#1.offset| 0) (<= 4 |ULTIMATE.start_main_~a~0#1.offset|) (<= 0 |ULTIMATE.start_main_~a~0#1.base|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= 0 |ULTIMATE.start_main_~arr~0#1.base|) (<= 1 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~arr~0#1.offset|) (<= 0 |#StackHeapBarrier|))) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2021-11-25 18:03:15,060 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:03:15,061 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:03:15,061 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 46 [2021-11-25 18:03:15,061 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [66458288] [2021-11-25 18:03:15,061 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:03:15,062 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2021-11-25 18:03:15,062 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:03:15,062 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-11-25 18:03:15,063 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=571, Invalid=2621, Unknown=0, NotChecked=0, Total=3192 [2021-11-25 18:03:15,064 INFO L87 Difference]: Start difference. First operand 59 states and 60 transitions. Second operand has 47 states, 47 states have (on average 3.574468085106383) internal successors, (168), 46 states have internal predecessors, (168), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:03:15,700 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:03:15,700 INFO L93 Difference]: Finished difference Result 99 states and 100 transitions. [2021-11-25 18:03:15,701 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-25 18:03:15,701 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 3.574468085106383) internal successors, (168), 46 states have internal predecessors, (168), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 58 [2021-11-25 18:03:15,701 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:03:15,702 INFO L225 Difference]: With dead ends: 99 [2021-11-25 18:03:15,702 INFO L226 Difference]: Without dead ends: 62 [2021-11-25 18:03:15,704 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 203 GetRequests, 133 SyntacticMatches, 0 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1763 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=917, Invalid=4195, Unknown=0, NotChecked=0, Total=5112 [2021-11-25 18:03:15,704 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 74 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 383 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 74 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 408 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 383 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:03:15,705 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [74 Valid, 63 Invalid, 408 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 383 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 18:03:15,705 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-11-25 18:03:15,708 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2021-11-25 18:03:15,709 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 60 states have (on average 1.0333333333333334) internal successors, (62), 60 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:03:15,710 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 62 transitions. [2021-11-25 18:03:15,710 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 62 transitions. Word has length 58 [2021-11-25 18:03:15,710 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:03:15,710 INFO L470 AbstractCegarLoop]: Abstraction has 61 states and 62 transitions. [2021-11-25 18:03:15,711 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 3.574468085106383) internal successors, (168), 46 states have internal predecessors, (168), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:03:15,711 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 62 transitions. [2021-11-25 18:03:15,730 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-25 18:03:15,731 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:03:15,731 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1] [2021-11-25 18:03:15,760 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e9dd74b5-b196-428e-8e79-6da2d4c1d5b8/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-25 18:03:15,942 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e9dd74b5-b196-428e-8e79-6da2d4c1d5b8/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-25 18:03:15,943 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-25 18:03:15,943 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:03:15,943 INFO L85 PathProgramCache]: Analyzing trace with hash 1553536765, now seen corresponding path program 9 times [2021-11-25 18:03:15,943 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:03:15,944 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [853054318] [2021-11-25 18:03:15,944 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:03:15,944 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:03:15,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:03:16,469 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 25 proven. 157 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:03:16,469 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:03:16,469 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [853054318] [2021-11-25 18:03:16,469 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [853054318] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:03:16,469 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [775151383] [2021-11-25 18:03:16,470 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 18:03:16,470 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:03:16,470 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e9dd74b5-b196-428e-8e79-6da2d4c1d5b8/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:03:16,470 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e9dd74b5-b196-428e-8e79-6da2d4c1d5b8/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:03:16,471 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e9dd74b5-b196-428e-8e79-6da2d4c1d5b8/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-25 18:03:16,585 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 18:03:16,585 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:03:16,588 INFO L263 TraceCheckSpWp]: Trace formula consists of 388 conjuncts, 74 conjunts are in the unsatisfiable core [2021-11-25 18:03:16,594 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:03:16,890 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 18:03:17,098 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:03:17,099 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 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 33 treesize of output 26 [2021-11-25 18:03:17,182 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 18:03:17,273 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 18:03:17,365 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 18:03:17,456 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 18:03:17,541 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 18:03:17,611 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 18:03:17,652 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 25 proven. 157 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:03:17,652 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:03:19,005 INFO L354 Elim1Store]: treesize reduction 17, result has 66.0 percent of original size [2021-11-25 18:03:19,006 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 3 new quantified variables, introduced 4 case distinctions, treesize of input 1328223 treesize of output 1131385 [2021-11-25 18:03:20,893 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 18:03:20,894 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 1131316 treesize of output 1098552 [2021-11-25 18:03:34,126 WARN L227 SmtUtils]: Spent 6.06s on a formula simplification. DAG size of input: 627 DAG size of output: 627 (called from [L1066] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify)