./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/reducercommutativity/sep10-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 839c364b Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_291840ac-8e58-4aff-b3c5-6cb46cdbd1e6/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_291840ac-8e58-4aff-b3c5-6cb46cdbd1e6/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_291840ac-8e58-4aff-b3c5-6cb46cdbd1e6/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_291840ac-8e58-4aff-b3c5-6cb46cdbd1e6/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/reducercommutativity/sep10-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_291840ac-8e58-4aff-b3c5-6cb46cdbd1e6/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_291840ac-8e58-4aff-b3c5-6cb46cdbd1e6/bin/utaipan-eEHZpOm5b7 --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 246513a49efb434b9c960a67f526057a6e0f9037478ee43a300fa4a565ea6e54 --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 19:40:14,111 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 19:40:14,113 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 19:40:14,157 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 19:40:14,165 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 19:40:14,171 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 19:40:14,174 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 19:40:14,179 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 19:40:14,183 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 19:40:14,190 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 19:40:14,192 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 19:40:14,194 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 19:40:14,195 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 19:40:14,198 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 19:40:14,201 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 19:40:14,205 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 19:40:14,207 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 19:40:14,208 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 19:40:14,214 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 19:40:14,223 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 19:40:14,225 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 19:40:14,227 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 19:40:14,230 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 19:40:14,232 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 19:40:14,237 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 19:40:14,237 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 19:40:14,238 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 19:40:14,240 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 19:40:14,242 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 19:40:14,244 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 19:40:14,244 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 19:40:14,245 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 19:40:14,248 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 19:40:14,250 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 19:40:14,252 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 19:40:14,252 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 19:40:14,253 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 19:40:14,253 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 19:40:14,254 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 19:40:14,255 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 19:40:14,256 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 19:40:14,257 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_291840ac-8e58-4aff-b3c5-6cb46cdbd1e6/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-25 19:40:14,311 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 19:40:14,312 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 19:40:14,313 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 19:40:14,313 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 19:40:14,322 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 19:40:14,322 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 19:40:14,323 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 19:40:14,323 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 19:40:14,323 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 19:40:14,323 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 19:40:14,325 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 19:40:14,325 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 19:40:14,325 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 19:40:14,325 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 19:40:14,326 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 19:40:14,326 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 19:40:14,326 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 19:40:14,327 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 19:40:14,328 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 19:40:14,328 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 19:40:14,328 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 19:40:14,328 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 19:40:14,329 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 19:40:14,329 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 19:40:14,329 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 19:40:14,330 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 19:40:14,331 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 19:40:14,332 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 19:40:14,332 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 19:40:14,332 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 19:40:14,332 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 19:40:14,333 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 19:40:14,333 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 19:40:14,333 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 19:40:14,334 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 19:40:14,334 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 19:40:14,334 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 19:40:14,334 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 19:40:14,335 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 19:40:14,335 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 19:40:14,335 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 19:40:14,335 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_291840ac-8e58-4aff-b3c5-6cb46cdbd1e6/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_291840ac-8e58-4aff-b3c5-6cb46cdbd1e6/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 246513a49efb434b9c960a67f526057a6e0f9037478ee43a300fa4a565ea6e54 [2021-11-25 19:40:14,666 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 19:40:14,688 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 19:40:14,691 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 19:40:14,693 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 19:40:14,693 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 19:40:14,695 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_291840ac-8e58-4aff-b3c5-6cb46cdbd1e6/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/reducercommutativity/sep10-2.i [2021-11-25 19:40:14,803 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_291840ac-8e58-4aff-b3c5-6cb46cdbd1e6/bin/utaipan-eEHZpOm5b7/data/3f5d5664b/7e8f81a830b7416ba6e422d81e2c11c2/FLAG8669241bd [2021-11-25 19:40:15,447 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 19:40:15,448 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_291840ac-8e58-4aff-b3c5-6cb46cdbd1e6/sv-benchmarks/c/reducercommutativity/sep10-2.i [2021-11-25 19:40:15,455 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_291840ac-8e58-4aff-b3c5-6cb46cdbd1e6/bin/utaipan-eEHZpOm5b7/data/3f5d5664b/7e8f81a830b7416ba6e422d81e2c11c2/FLAG8669241bd [2021-11-25 19:40:15,808 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_291840ac-8e58-4aff-b3c5-6cb46cdbd1e6/bin/utaipan-eEHZpOm5b7/data/3f5d5664b/7e8f81a830b7416ba6e422d81e2c11c2 [2021-11-25 19:40:15,811 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 19:40:15,814 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 19:40:15,816 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 19:40:15,816 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 19:40:15,822 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 19:40:15,823 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 07:40:15" (1/1) ... [2021-11-25 19:40:15,826 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5c438040 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:40:15, skipping insertion in model container [2021-11-25 19:40:15,827 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 07:40:15" (1/1) ... [2021-11-25 19:40:15,835 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 19:40:15,860 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 19:40:16,080 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_291840ac-8e58-4aff-b3c5-6cb46cdbd1e6/sv-benchmarks/c/reducercommutativity/sep10-2.i[1293,1306] [2021-11-25 19:40:16,084 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 19:40:16,091 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 19:40:16,112 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_291840ac-8e58-4aff-b3c5-6cb46cdbd1e6/sv-benchmarks/c/reducercommutativity/sep10-2.i[1293,1306] [2021-11-25 19:40:16,114 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 19:40:16,128 INFO L208 MainTranslator]: Completed translation [2021-11-25 19:40:16,129 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:40:16 WrapperNode [2021-11-25 19:40:16,129 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 19:40:16,130 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 19:40:16,130 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 19:40:16,131 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 19:40:16,150 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:40:16" (1/1) ... [2021-11-25 19:40:16,158 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:40:16" (1/1) ... [2021-11-25 19:40:16,182 INFO L137 Inliner]: procedures = 16, calls = 22, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 67 [2021-11-25 19:40:16,182 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 19:40:16,183 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 19:40:16,184 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 19:40:16,184 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 19:40:16,194 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:40:16" (1/1) ... [2021-11-25 19:40:16,194 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:40:16" (1/1) ... [2021-11-25 19:40:16,197 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:40:16" (1/1) ... [2021-11-25 19:40:16,198 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:40:16" (1/1) ... [2021-11-25 19:40:16,205 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:40:16" (1/1) ... [2021-11-25 19:40:16,210 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:40:16" (1/1) ... [2021-11-25 19:40:16,212 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:40:16" (1/1) ... [2021-11-25 19:40:16,214 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 19:40:16,215 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 19:40:16,216 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 19:40:16,216 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 19:40:16,217 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:40:16" (1/1) ... [2021-11-25 19:40:16,229 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 19:40:16,242 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_291840ac-8e58-4aff-b3c5-6cb46cdbd1e6/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:40:16,255 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_291840ac-8e58-4aff-b3c5-6cb46cdbd1e6/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 19:40:16,271 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_291840ac-8e58-4aff-b3c5-6cb46cdbd1e6/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 19:40:16,325 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 19:40:16,325 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 19:40:16,325 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-25 19:40:16,325 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-25 19:40:16,325 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 19:40:16,325 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 19:40:16,326 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-25 19:40:16,326 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-25 19:40:16,326 INFO L130 BoogieDeclarations]: Found specification of procedure sep [2021-11-25 19:40:16,326 INFO L138 BoogieDeclarations]: Found implementation of procedure sep [2021-11-25 19:40:16,416 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 19:40:16,418 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 19:40:16,586 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 19:40:16,632 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 19:40:16,633 INFO L301 CfgBuilder]: Removed 3 assume(true) statements. [2021-11-25 19:40:16,635 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 07:40:16 BoogieIcfgContainer [2021-11-25 19:40:16,636 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 19:40:16,638 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 19:40:16,638 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 19:40:16,643 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 19:40:16,643 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 07:40:15" (1/3) ... [2021-11-25 19:40:16,644 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@c11057 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 07:40:16, skipping insertion in model container [2021-11-25 19:40:16,645 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:40:16" (2/3) ... [2021-11-25 19:40:16,645 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@c11057 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 07:40:16, skipping insertion in model container [2021-11-25 19:40:16,646 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 07:40:16" (3/3) ... [2021-11-25 19:40:16,647 INFO L111 eAbstractionObserver]: Analyzing ICFG sep10-2.i [2021-11-25 19:40:16,653 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 19:40:16,653 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-25 19:40:16,714 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 19:40:16,723 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-25 19:40:16,723 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-25 19:40:16,743 INFO L276 IsEmpty]: Start isEmpty. Operand has 17 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-25 19:40:16,749 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-25 19:40:16,749 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:40:16,750 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:40:16,751 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:40:16,757 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:40:16,758 INFO L85 PathProgramCache]: Analyzing trace with hash 1882327324, now seen corresponding path program 1 times [2021-11-25 19:40:16,769 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:40:16,770 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1515952738] [2021-11-25 19:40:16,770 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:40:16,771 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:40:16,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:40:17,060 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-25 19:40:17,061 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:40:17,061 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1515952738] [2021-11-25 19:40:17,062 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1515952738] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:40:17,063 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:40:17,063 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 19:40:17,065 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [490861514] [2021-11-25 19:40:17,067 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:40:17,072 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:40:17,073 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:40:17,107 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:40:17,108 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:40:17,111 INFO L87 Difference]: Start difference. First operand has 17 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 1 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-25 19:40:17,166 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:40:17,167 INFO L93 Difference]: Finished difference Result 33 states and 43 transitions. [2021-11-25 19:40:17,168 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:40:17,170 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 1 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 20 [2021-11-25 19:40:17,170 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:40:17,179 INFO L225 Difference]: With dead ends: 33 [2021-11-25 19:40:17,180 INFO L226 Difference]: Without dead ends: 16 [2021-11-25 19:40:17,184 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:40:17,189 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 0 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:40:17,191 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 26 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 19:40:17,212 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2021-11-25 19:40:17,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2021-11-25 19:40:17,235 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 11 states have internal predecessors, (14), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-25 19:40:17,236 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 20 transitions. [2021-11-25 19:40:17,238 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 20 transitions. Word has length 20 [2021-11-25 19:40:17,238 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:40:17,239 INFO L470 AbstractCegarLoop]: Abstraction has 16 states and 20 transitions. [2021-11-25 19:40:17,239 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 1 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-25 19:40:17,239 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 20 transitions. [2021-11-25 19:40:17,242 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-25 19:40:17,242 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:40:17,242 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:40:17,243 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-25 19:40:17,243 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:40:17,244 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:40:17,245 INFO L85 PathProgramCache]: Analyzing trace with hash -455280311, now seen corresponding path program 1 times [2021-11-25 19:40:17,245 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:40:17,246 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [999044752] [2021-11-25 19:40:17,246 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:40:17,246 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:40:17,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:40:17,357 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-25 19:40:17,357 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:40:17,357 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [999044752] [2021-11-25 19:40:17,358 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [999044752] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:40:17,358 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1599939733] [2021-11-25 19:40:17,359 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:40:17,359 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:40:17,359 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_291840ac-8e58-4aff-b3c5-6cb46cdbd1e6/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:40:17,362 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_291840ac-8e58-4aff-b3c5-6cb46cdbd1e6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:40:17,387 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_291840ac-8e58-4aff-b3c5-6cb46cdbd1e6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 19:40:17,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:40:17,519 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 19:40:17,525 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:40:17,615 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 19:40:17,616 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:40:17,617 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1599939733] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:40:17,621 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:40:17,622 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 5 [2021-11-25 19:40:17,624 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [221016698] [2021-11-25 19:40:17,625 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:40:17,626 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:40:17,628 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:40:17,631 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:40:17,632 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:40:17,632 INFO L87 Difference]: Start difference. First operand 16 states and 20 transitions. Second operand has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-25 19:40:17,673 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:40:17,673 INFO L93 Difference]: Finished difference Result 29 states and 39 transitions. [2021-11-25 19:40:17,675 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:40:17,676 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) Word has length 21 [2021-11-25 19:40:17,677 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:40:17,678 INFO L225 Difference]: With dead ends: 29 [2021-11-25 19:40:17,686 INFO L226 Difference]: Without dead ends: 17 [2021-11-25 19:40:17,687 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:40:17,689 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 14 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:40:17,691 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 23 Invalid, 14 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 19:40:17,694 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-11-25 19:40:17,700 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2021-11-25 19:40:17,703 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 12 states have (on average 1.25) internal successors, (15), 12 states have internal predecessors, (15), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-25 19:40:17,704 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 21 transitions. [2021-11-25 19:40:17,705 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 21 transitions. Word has length 21 [2021-11-25 19:40:17,706 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:40:17,706 INFO L470 AbstractCegarLoop]: Abstraction has 17 states and 21 transitions. [2021-11-25 19:40:17,707 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-25 19:40:17,707 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 21 transitions. [2021-11-25 19:40:17,709 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-25 19:40:17,709 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:40:17,709 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:40:17,750 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_291840ac-8e58-4aff-b3c5-6cb46cdbd1e6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2021-11-25 19:40:17,935 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_291840ac-8e58-4aff-b3c5-6cb46cdbd1e6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:40:17,936 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:40:17,937 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:40:17,937 INFO L85 PathProgramCache]: Analyzing trace with hash -1000039237, now seen corresponding path program 1 times [2021-11-25 19:40:17,937 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:40:17,937 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1071319415] [2021-11-25 19:40:17,938 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:40:17,938 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:40:18,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:40:18,095 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-25 19:40:18,095 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:40:18,096 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1071319415] [2021-11-25 19:40:18,096 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1071319415] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:40:18,099 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [495603581] [2021-11-25 19:40:18,100 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:40:18,100 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:40:18,101 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_291840ac-8e58-4aff-b3c5-6cb46cdbd1e6/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:40:18,102 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_291840ac-8e58-4aff-b3c5-6cb46cdbd1e6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:40:18,123 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_291840ac-8e58-4aff-b3c5-6cb46cdbd1e6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-25 19:40:18,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:40:18,200 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 19:40:18,203 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:40:18,280 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 19:40:18,280 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:40:18,280 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [495603581] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:40:18,281 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:40:18,281 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 5 [2021-11-25 19:40:18,281 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1773108070] [2021-11-25 19:40:18,282 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:40:18,282 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:40:18,282 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:40:18,283 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:40:18,283 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:40:18,284 INFO L87 Difference]: Start difference. First operand 17 states and 21 transitions. Second operand has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-25 19:40:18,305 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:40:18,306 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2021-11-25 19:40:18,306 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:40:18,306 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 24 [2021-11-25 19:40:18,307 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:40:18,308 INFO L225 Difference]: With dead ends: 27 [2021-11-25 19:40:18,308 INFO L226 Difference]: Without dead ends: 18 [2021-11-25 19:40:18,308 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:40:18,310 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 14 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:40:18,311 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 23 Invalid, 14 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 19:40:18,312 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-11-25 19:40:18,316 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2021-11-25 19:40:18,317 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 13 states have internal predecessors, (16), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-25 19:40:18,318 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 22 transitions. [2021-11-25 19:40:18,318 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 22 transitions. Word has length 24 [2021-11-25 19:40:18,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:40:18,320 INFO L470 AbstractCegarLoop]: Abstraction has 18 states and 22 transitions. [2021-11-25 19:40:18,320 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-25 19:40:18,321 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 22 transitions. [2021-11-25 19:40:18,322 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-25 19:40:18,322 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:40:18,322 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:40:18,361 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_291840ac-8e58-4aff-b3c5-6cb46cdbd1e6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-25 19:40:18,547 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_291840ac-8e58-4aff-b3c5-6cb46cdbd1e6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:40:18,547 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:40:18,548 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:40:18,548 INFO L85 PathProgramCache]: Analyzing trace with hash 1888998743, now seen corresponding path program 1 times [2021-11-25 19:40:18,549 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:40:18,549 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [522795841] [2021-11-25 19:40:18,549 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:40:18,549 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:40:18,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:40:18,612 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-25 19:40:18,613 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:40:18,613 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [522795841] [2021-11-25 19:40:18,613 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [522795841] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:40:18,614 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1738619309] [2021-11-25 19:40:18,617 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:40:18,618 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:40:18,618 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_291840ac-8e58-4aff-b3c5-6cb46cdbd1e6/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:40:18,623 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_291840ac-8e58-4aff-b3c5-6cb46cdbd1e6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:40:18,647 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_291840ac-8e58-4aff-b3c5-6cb46cdbd1e6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-25 19:40:18,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:40:18,722 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 19:40:18,724 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:40:18,823 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-25 19:40:18,823 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:40:18,897 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-25 19:40:18,897 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1738619309] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:40:18,897 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [702015542] [2021-11-25 19:40:18,920 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 19:40:18,920 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:40:18,926 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:40:18,933 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:40:18,934 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:40:19,023 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:19,048 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 19:40:19,049 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2021-11-25 19:40:19,064 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:19,083 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 19:40:19,084 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 19:40:19,127 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:19,128 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 19:40:19,232 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:19,234 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:40:19,264 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 19:40:19,265 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 190 treesize of output 189 [2021-11-25 19:40:19,425 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 19:40:19,542 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:19,544 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 30 treesize of output 20 [2021-11-25 19:40:19,740 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:19,742 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 25 treesize of output 20 [2021-11-25 19:40:19,795 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:19,797 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:19,798 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:19,834 INFO L354 Elim1Store]: treesize reduction 65, result has 27.0 percent of original size [2021-11-25 19:40:19,835 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 72 treesize of output 80 [2021-11-25 19:40:19,919 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:19,920 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 24 [2021-11-25 19:40:19,942 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 19:40:20,168 INFO L197 IcfgInterpreter]: Interpreting procedure sep with input of size 12 for LOIs [2021-11-25 19:40:20,270 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:40:23,417 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '524#(and (exists ((v_sep_~ret~0_BEFORE_RETURN_6 Int)) (= |ULTIMATE.start_main_~ret5~0#1| (ite (<= (mod v_sep_~ret~0_BEFORE_RETURN_6 4294967296) 2147483647) (mod v_sep_~ret~0_BEFORE_RETURN_6 4294967296) (+ (mod v_sep_~ret~0_BEFORE_RETURN_6 4294967296) (- 4294967296))))) (<= 9 |ULTIMATE.start_main_~i~2#1|) (<= |ULTIMATE.start_main_~ret2~0#1| 2147483647) (or (not (= |ULTIMATE.start_main_~ret2~0#1| |ULTIMATE.start_main_~ret~1#1|)) (not (= |ULTIMATE.start_main_~ret5~0#1| |ULTIMATE.start_main_~ret~1#1|))) (<= 0 (+ |ULTIMATE.start_main_~ret~1#1| 2147483648)) (<= |ULTIMATE.start_main_~ret~1#1| 2147483647) (= |ULTIMATE.start_main_~#x~0#1.offset| 0) (<= 0 (+ |ULTIMATE.start_main_~ret2~0#1| 2147483648)) (<= 10 |ULTIMATE.start_main_~i~1#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_~temp~0#1| (select (select |#memory_int| |ULTIMATE.start_main_~#x~0#1.base|) (+ 36 |ULTIMATE.start_main_~#x~0#1.offset|))) (<= 0 |ULTIMATE.start_main_~#x~0#1.base|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 19:40:23,417 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:40:23,418 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:40:23,418 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 3, 4] total 7 [2021-11-25 19:40:23,418 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [876168711] [2021-11-25 19:40:23,418 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:40:23,419 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-25 19:40:23,419 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:40:23,420 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-25 19:40:23,420 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=299, Unknown=0, NotChecked=0, Total=380 [2021-11-25 19:40:23,420 INFO L87 Difference]: Start difference. First operand 18 states and 22 transitions. Second operand has 7 states, 7 states have (on average 3.0) internal successors, (21), 7 states have internal predecessors, (21), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2021-11-25 19:40:23,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:40:23,460 INFO L93 Difference]: Finished difference Result 36 states and 46 transitions. [2021-11-25 19:40:23,460 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 19:40:23,460 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.0) internal successors, (21), 7 states have internal predecessors, (21), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) Word has length 25 [2021-11-25 19:40:23,461 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:40:23,462 INFO L225 Difference]: With dead ends: 36 [2021-11-25 19:40:23,462 INFO L226 Difference]: Without dead ends: 21 [2021-11-25 19:40:23,463 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 117 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=81, Invalid=299, Unknown=0, NotChecked=0, Total=380 [2021-11-25 19:40:23,466 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:40:23,467 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 36 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 19:40:23,468 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-11-25 19:40:23,473 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2021-11-25 19:40:23,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 16 states have (on average 1.1875) internal successors, (19), 16 states have internal predecessors, (19), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-25 19:40:23,477 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2021-11-25 19:40:23,477 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 25 [2021-11-25 19:40:23,477 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:40:23,477 INFO L470 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2021-11-25 19:40:23,478 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.0) internal successors, (21), 7 states have internal predecessors, (21), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2021-11-25 19:40:23,478 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2021-11-25 19:40:23,480 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-25 19:40:23,480 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:40:23,480 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:40:23,520 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_291840ac-8e58-4aff-b3c5-6cb46cdbd1e6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-25 19:40:23,695 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_291840ac-8e58-4aff-b3c5-6cb46cdbd1e6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:40:23,695 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:40:23,696 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:40:23,696 INFO L85 PathProgramCache]: Analyzing trace with hash 1408780010, now seen corresponding path program 2 times [2021-11-25 19:40:23,696 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:40:23,696 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1724727803] [2021-11-25 19:40:23,697 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:40:23,697 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:40:23,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:40:23,790 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-25 19:40:23,791 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:40:23,791 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1724727803] [2021-11-25 19:40:23,791 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1724727803] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:40:23,791 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [301266968] [2021-11-25 19:40:23,792 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 19:40:23,792 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:40:23,792 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_291840ac-8e58-4aff-b3c5-6cb46cdbd1e6/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:40:23,793 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_291840ac-8e58-4aff-b3c5-6cb46cdbd1e6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:40:23,815 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_291840ac-8e58-4aff-b3c5-6cb46cdbd1e6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-25 19:40:23,875 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-25 19:40:23,875 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:40:23,877 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 19:40:23,881 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:40:23,934 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 10 proven. 1 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-25 19:40:23,935 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:40:23,996 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 10 proven. 1 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-25 19:40:23,996 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [301266968] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:40:23,996 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [428998503] [2021-11-25 19:40:24,000 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 19:40:24,000 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:40:24,001 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:40:24,001 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:40:24,001 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:40:24,023 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:24,042 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 19:40:24,042 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 19:40:24,053 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:24,055 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2021-11-25 19:40:24,083 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:24,085 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 19:40:24,154 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:24,157 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:24,160 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:24,177 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 19:40:24,177 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 200 treesize of output 188 [2021-11-25 19:40:24,224 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 19:40:24,303 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:24,304 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 30 treesize of output 20 [2021-11-25 19:40:24,442 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:24,443 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:24,444 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:40:24,445 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 32 treesize of output 27 [2021-11-25 19:40:24,477 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:24,480 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:24,481 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:24,482 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:24,498 INFO L354 Elim1Store]: treesize reduction 57, result has 5.0 percent of original size [2021-11-25 19:40:24,498 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 80 treesize of output 72 [2021-11-25 19:40:24,535 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:24,537 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 24 [2021-11-25 19:40:24,551 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 13 treesize of output 9 [2021-11-25 19:40:24,727 INFO L197 IcfgInterpreter]: Interpreting procedure sep with input of size 12 for LOIs [2021-11-25 19:40:24,808 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:40:31,840 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '797#(and (<= 9 |ULTIMATE.start_main_~i~2#1|) (<= 0 |#NULL.base|) (<= |ULTIMATE.start_main_~ret2~0#1| 2147483647) (exists ((v_sep_~ret~0_BEFORE_RETURN_11 Int)) (= |ULTIMATE.start_main_~ret5~0#1| (ite (<= (mod v_sep_~ret~0_BEFORE_RETURN_11 4294967296) 2147483647) (mod v_sep_~ret~0_BEFORE_RETURN_11 4294967296) (+ (mod v_sep_~ret~0_BEFORE_RETURN_11 4294967296) (- 4294967296))))) (<= 0 |ULTIMATE.start_main_~#x~0#1.offset|) (or (not (= |ULTIMATE.start_main_~ret2~0#1| |ULTIMATE.start_main_~ret~1#1|)) (not (= |ULTIMATE.start_main_~ret5~0#1| |ULTIMATE.start_main_~ret~1#1|))) (<= 0 (+ |ULTIMATE.start_main_~ret~1#1| 2147483648)) (<= |#NULL.offset| 0) (<= |ULTIMATE.start_main_~ret~1#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~ret2~0#1| 2147483648)) (<= |#NULL.base| 0) (<= 10 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~temp~0#1| (select (select |#memory_int| |ULTIMATE.start_main_~#x~0#1.base|) (+ 36 |ULTIMATE.start_main_~#x~0#1.offset|))) (<= 0 |ULTIMATE.start_main_~#x~0#1.base|) (<= 0 |#NULL.offset|) (<= |ULTIMATE.start_main_~#x~0#1.offset| 0) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-25 19:40:31,841 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:40:31,841 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:40:31,841 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2021-11-25 19:40:31,842 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [706428629] [2021-11-25 19:40:31,842 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:40:31,843 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-25 19:40:31,843 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:40:31,843 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-25 19:40:31,844 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=299, Unknown=0, NotChecked=0, Total=380 [2021-11-25 19:40:31,844 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 7 states have internal predecessors, (25), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-25 19:40:31,896 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:40:31,896 INFO L93 Difference]: Finished difference Result 38 states and 50 transitions. [2021-11-25 19:40:31,897 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 19:40:31,897 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 7 states have internal predecessors, (25), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 28 [2021-11-25 19:40:31,898 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:40:31,901 INFO L225 Difference]: With dead ends: 38 [2021-11-25 19:40:31,903 INFO L226 Difference]: Without dead ends: 24 [2021-11-25 19:40:31,905 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 68 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 117 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=81, Invalid=299, Unknown=0, NotChecked=0, Total=380 [2021-11-25 19:40:31,906 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:40:31,907 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 34 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 19:40:31,908 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-11-25 19:40:31,918 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2021-11-25 19:40:31,918 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 19 states have internal predecessors, (22), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-25 19:40:31,924 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 28 transitions. [2021-11-25 19:40:31,924 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 28 transitions. Word has length 28 [2021-11-25 19:40:31,928 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:40:31,928 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 28 transitions. [2021-11-25 19:40:31,928 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 7 states have internal predecessors, (25), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-25 19:40:31,929 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 28 transitions. [2021-11-25 19:40:31,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-11-25 19:40:31,931 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:40:31,931 INFO L514 BasicCegarLoop]: trace histogram [12, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:40:31,974 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_291840ac-8e58-4aff-b3c5-6cb46cdbd1e6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-25 19:40:32,147 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_291840ac-8e58-4aff-b3c5-6cb46cdbd1e6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:40:32,147 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:40:32,148 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:40:32,148 INFO L85 PathProgramCache]: Analyzing trace with hash 1594010674, now seen corresponding path program 3 times [2021-11-25 19:40:32,148 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:40:32,148 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1223927281] [2021-11-25 19:40:32,148 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:40:32,148 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:40:32,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:40:32,350 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2021-11-25 19:40:32,350 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:40:32,350 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1223927281] [2021-11-25 19:40:32,350 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1223927281] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:40:32,351 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [871666799] [2021-11-25 19:40:32,352 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 19:40:32,352 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:40:32,353 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_291840ac-8e58-4aff-b3c5-6cb46cdbd1e6/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:40:32,353 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_291840ac-8e58-4aff-b3c5-6cb46cdbd1e6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:40:32,359 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_291840ac-8e58-4aff-b3c5-6cb46cdbd1e6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-25 19:40:32,462 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 19:40:32,463 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:40:32,465 INFO L263 TraceCheckSpWp]: Trace formula consists of 215 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-25 19:40:32,467 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:40:32,580 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 52 proven. 10 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2021-11-25 19:40:32,581 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:40:32,728 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 0 proven. 62 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2021-11-25 19:40:32,728 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [871666799] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:40:32,728 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1068154061] [2021-11-25 19:40:32,732 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 19:40:32,732 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:40:32,732 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:40:32,732 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:40:32,732 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:40:32,753 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:32,770 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 19:40:32,770 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2021-11-25 19:40:32,783 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:32,803 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 19:40:32,804 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 19:40:32,828 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:32,829 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 19:40:32,881 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:32,884 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:32,887 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:32,900 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 19:40:32,901 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 200 treesize of output 188 [2021-11-25 19:40:32,945 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 19:40:33,020 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:33,021 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 20 [2021-11-25 19:40:33,168 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:33,169 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:33,170 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:40:33,171 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 32 treesize of output 27 [2021-11-25 19:40:33,205 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:33,207 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:33,209 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:33,210 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:33,230 INFO L354 Elim1Store]: treesize reduction 57, result has 5.0 percent of original size [2021-11-25 19:40:33,231 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 80 treesize of output 72 [2021-11-25 19:40:33,261 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:33,262 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 24 [2021-11-25 19:40:33,283 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 19:40:33,461 INFO L197 IcfgInterpreter]: Interpreting procedure sep with input of size 12 for LOIs [2021-11-25 19:40:33,540 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:40:40,438 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1141#(and (<= 9 |ULTIMATE.start_main_~i~2#1|) (<= 0 |#NULL.base|) (<= |ULTIMATE.start_main_~ret2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~#x~0#1.offset|) (or (not (= |ULTIMATE.start_main_~ret2~0#1| |ULTIMATE.start_main_~ret~1#1|)) (not (= |ULTIMATE.start_main_~ret5~0#1| |ULTIMATE.start_main_~ret~1#1|))) (<= 0 (+ |ULTIMATE.start_main_~ret~1#1| 2147483648)) (<= |#NULL.offset| 0) (<= 0 (+ |ULTIMATE.start_main_~ret5~0#1| 2147483648)) (<= |ULTIMATE.start_main_~ret~1#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~ret2~0#1| 2147483648)) (<= |#NULL.base| 0) (<= 10 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~ret5~0#1| 2147483647) (= |ULTIMATE.start_main_~temp~0#1| (select (select |#memory_int| |ULTIMATE.start_main_~#x~0#1.base|) (+ 36 |ULTIMATE.start_main_~#x~0#1.offset|))) (<= 0 |ULTIMATE.start_main_~#x~0#1.base|) (<= 0 |#NULL.offset|) (<= |ULTIMATE.start_main_~#x~0#1.offset| 0) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-25 19:40:40,439 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:40:40,439 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:40:40,439 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 7, 7] total 14 [2021-11-25 19:40:40,439 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [621597274] [2021-11-25 19:40:40,439 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:40:40,440 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-25 19:40:40,440 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:40:40,441 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-25 19:40:40,441 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=571, Unknown=1, NotChecked=0, Total=702 [2021-11-25 19:40:40,442 INFO L87 Difference]: Start difference. First operand 24 states and 28 transitions. Second operand has 14 states, 14 states have (on average 2.2857142857142856) internal successors, (32), 14 states have internal predecessors, (32), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-25 19:40:40,505 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:40:40,505 INFO L93 Difference]: Finished difference Result 48 states and 64 transitions. [2021-11-25 19:40:40,505 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-25 19:40:40,506 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.2857142857142856) internal successors, (32), 14 states have internal predecessors, (32), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 37 [2021-11-25 19:40:40,506 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:40:40,507 INFO L225 Difference]: With dead ends: 48 [2021-11-25 19:40:40,507 INFO L226 Difference]: Without dead ends: 31 [2021-11-25 19:40:40,508 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 227 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=130, Invalid=571, Unknown=1, NotChecked=0, Total=702 [2021-11-25 19:40:40,509 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:40:40,509 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 56 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:40:40,510 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-11-25 19:40:40,514 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2021-11-25 19:40:40,514 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 26 states have (on average 1.1153846153846154) internal successors, (29), 26 states have internal predecessors, (29), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-25 19:40:40,515 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2021-11-25 19:40:40,515 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 37 [2021-11-25 19:40:40,516 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:40:40,516 INFO L470 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2021-11-25 19:40:40,516 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.2857142857142856) internal successors, (32), 14 states have internal predecessors, (32), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-25 19:40:40,516 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2021-11-25 19:40:40,518 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-25 19:40:40,518 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:40:40,518 INFO L514 BasicCegarLoop]: trace histogram [30, 4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:40:40,556 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_291840ac-8e58-4aff-b3c5-6cb46cdbd1e6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-25 19:40:40,719 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_291840ac-8e58-4aff-b3c5-6cb46cdbd1e6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:40:40,720 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:40:40,720 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:40:40,720 INFO L85 PathProgramCache]: Analyzing trace with hash -2102244964, now seen corresponding path program 4 times [2021-11-25 19:40:40,720 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:40:40,720 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1947765548] [2021-11-25 19:40:40,721 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:40:40,721 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:40:40,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:40:40,972 INFO L134 CoverageAnalysis]: Checked inductivity of 547 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 537 trivial. 0 not checked. [2021-11-25 19:40:40,973 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:40:40,973 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1947765548] [2021-11-25 19:40:40,977 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1947765548] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:40:40,977 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1355390771] [2021-11-25 19:40:40,978 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 19:40:40,978 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:40:40,978 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_291840ac-8e58-4aff-b3c5-6cb46cdbd1e6/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:40:40,979 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_291840ac-8e58-4aff-b3c5-6cb46cdbd1e6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:40:40,995 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_291840ac-8e58-4aff-b3c5-6cb46cdbd1e6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-25 19:40:41,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:40:41,123 INFO L263 TraceCheckSpWp]: Trace formula consists of 294 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-25 19:40:41,132 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:40:41,269 INFO L134 CoverageAnalysis]: Checked inductivity of 547 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 537 trivial. 0 not checked. [2021-11-25 19:40:41,269 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:40:41,449 INFO L134 CoverageAnalysis]: Checked inductivity of 547 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 537 trivial. 0 not checked. [2021-11-25 19:40:41,449 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1355390771] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:40:41,449 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [677143938] [2021-11-25 19:40:41,452 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 19:40:41,452 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:40:41,453 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:40:41,453 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:40:41,453 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:40:41,479 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:41,494 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 19:40:41,495 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 19:40:41,504 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:41,510 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2021-11-25 19:40:41,539 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:41,541 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 19:40:41,594 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:41,597 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:41,600 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:41,614 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 19:40:41,615 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 200 treesize of output 188 [2021-11-25 19:40:41,655 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 19:40:41,724 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:41,725 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 30 treesize of output 20 [2021-11-25 19:40:41,848 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:41,849 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:41,850 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:40:41,851 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 32 treesize of output 27 [2021-11-25 19:40:41,881 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:41,883 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:41,884 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:41,885 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:41,902 INFO L354 Elim1Store]: treesize reduction 57, result has 5.0 percent of original size [2021-11-25 19:40:41,903 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 80 treesize of output 72 [2021-11-25 19:40:41,934 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:41,935 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 24 [2021-11-25 19:40:41,959 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 19:40:42,108 INFO L197 IcfgInterpreter]: Interpreting procedure sep with input of size 12 for LOIs [2021-11-25 19:40:42,204 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:40:47,049 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1632#(and (<= 9 |ULTIMATE.start_main_~i~2#1|) (<= 0 |#NULL.base|) (<= |ULTIMATE.start_main_~ret2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~#x~0#1.offset|) (or (not (= |ULTIMATE.start_main_~ret2~0#1| |ULTIMATE.start_main_~ret~1#1|)) (not (= |ULTIMATE.start_main_~ret5~0#1| |ULTIMATE.start_main_~ret~1#1|))) (exists ((v_sep_~ret~0_BEFORE_RETURN_24 Int)) (= |ULTIMATE.start_main_~ret5~0#1| (ite (<= (mod v_sep_~ret~0_BEFORE_RETURN_24 4294967296) 2147483647) (mod v_sep_~ret~0_BEFORE_RETURN_24 4294967296) (+ (- 4294967296) (mod v_sep_~ret~0_BEFORE_RETURN_24 4294967296))))) (<= 0 (+ |ULTIMATE.start_main_~ret~1#1| 2147483648)) (<= |#NULL.offset| 0) (<= |ULTIMATE.start_main_~ret~1#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~ret2~0#1| 2147483648)) (<= |#NULL.base| 0) (<= 10 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~temp~0#1| (select (select |#memory_int| |ULTIMATE.start_main_~#x~0#1.base|) (+ 36 |ULTIMATE.start_main_~#x~0#1.offset|))) (<= 0 |ULTIMATE.start_main_~#x~0#1.base|) (<= 0 |#NULL.offset|) (<= |ULTIMATE.start_main_~#x~0#1.offset| 0) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-25 19:40:47,049 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:40:47,049 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:40:47,049 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 7] total 13 [2021-11-25 19:40:47,050 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [681240216] [2021-11-25 19:40:47,050 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:40:47,050 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-25 19:40:47,050 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:40:47,051 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-25 19:40:47,051 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2021-11-25 19:40:47,052 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand has 13 states, 13 states have (on average 2.076923076923077) internal successors, (27), 13 states have internal predecessors, (27), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2021-11-25 19:40:47,109 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:40:47,109 INFO L93 Difference]: Finished difference Result 62 states and 75 transitions. [2021-11-25 19:40:47,109 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-25 19:40:47,110 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.076923076923077) internal successors, (27), 13 states have internal predecessors, (27), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) Word has length 56 [2021-11-25 19:40:47,110 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:40:47,110 INFO L225 Difference]: With dead ends: 62 [2021-11-25 19:40:47,111 INFO L226 Difference]: Without dead ends: 37 [2021-11-25 19:40:47,112 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 149 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 246 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2021-11-25 19:40:47,113 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 96 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:40:47,113 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 84 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 19:40:47,114 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-11-25 19:40:47,118 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2021-11-25 19:40:47,118 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 32 states have (on average 1.09375) internal successors, (35), 32 states have internal predecessors, (35), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-25 19:40:47,119 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 41 transitions. [2021-11-25 19:40:47,120 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 41 transitions. Word has length 56 [2021-11-25 19:40:47,120 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:40:47,120 INFO L470 AbstractCegarLoop]: Abstraction has 37 states and 41 transitions. [2021-11-25 19:40:47,120 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.076923076923077) internal successors, (27), 13 states have internal predecessors, (27), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2021-11-25 19:40:47,120 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 41 transitions. [2021-11-25 19:40:47,122 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-11-25 19:40:47,122 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:40:47,122 INFO L514 BasicCegarLoop]: trace histogram [30, 10, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:40:47,156 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_291840ac-8e58-4aff-b3c5-6cb46cdbd1e6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2021-11-25 19:40:47,322 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_291840ac-8e58-4aff-b3c5-6cb46cdbd1e6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:40:47,323 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:40:47,323 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:40:47,323 INFO L85 PathProgramCache]: Analyzing trace with hash 2041754236, now seen corresponding path program 5 times [2021-11-25 19:40:47,323 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:40:47,323 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [302690210] [2021-11-25 19:40:47,324 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:40:47,324 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:40:47,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:40:47,477 INFO L134 CoverageAnalysis]: Checked inductivity of 592 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 589 trivial. 0 not checked. [2021-11-25 19:40:47,477 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:40:47,477 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [302690210] [2021-11-25 19:40:47,477 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [302690210] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:40:47,478 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1175599140] [2021-11-25 19:40:47,478 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 19:40:47,478 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:40:47,478 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_291840ac-8e58-4aff-b3c5-6cb46cdbd1e6/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:40:47,479 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_291840ac-8e58-4aff-b3c5-6cb46cdbd1e6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:40:47,506 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_291840ac-8e58-4aff-b3c5-6cb46cdbd1e6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-25 19:40:47,589 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-25 19:40:47,589 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:40:47,591 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-25 19:40:47,594 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:40:47,711 INFO L134 CoverageAnalysis]: Checked inductivity of 592 backedges. 246 proven. 3 refuted. 0 times theorem prover too weak. 343 trivial. 0 not checked. [2021-11-25 19:40:47,711 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:40:47,840 INFO L134 CoverageAnalysis]: Checked inductivity of 592 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 589 trivial. 0 not checked. [2021-11-25 19:40:47,841 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1175599140] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:40:47,841 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [895392852] [2021-11-25 19:40:47,846 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 19:40:47,846 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:40:47,846 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:40:47,847 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:40:47,848 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:40:47,866 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:47,879 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 19:40:47,880 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2021-11-25 19:40:47,888 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:47,905 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 19:40:47,905 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 19:40:47,931 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:47,932 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 19:40:47,980 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:47,981 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:40:48,013 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 19:40:48,014 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 190 treesize of output 189 [2021-11-25 19:40:48,095 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 19:40:48,210 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:48,212 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 30 treesize of output 20 [2021-11-25 19:40:48,338 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:48,339 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 25 treesize of output 20 [2021-11-25 19:40:48,371 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:48,373 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:48,374 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:48,404 INFO L354 Elim1Store]: treesize reduction 60, result has 32.6 percent of original size [2021-11-25 19:40:48,404 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 72 treesize of output 85 [2021-11-25 19:40:48,456 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:48,457 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 24 [2021-11-25 19:40:48,471 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 19:40:48,635 INFO L197 IcfgInterpreter]: Interpreting procedure sep with input of size 12 for LOIs [2021-11-25 19:40:48,701 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:40:53,489 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2195#(and (<= 9 |ULTIMATE.start_main_~i~2#1|) (<= |ULTIMATE.start_main_~ret2~0#1| 2147483647) (exists ((v_sep_~ret~0_BEFORE_RETURN_30 Int)) (= |ULTIMATE.start_main_~ret5~0#1| (ite (<= (mod v_sep_~ret~0_BEFORE_RETURN_30 4294967296) 2147483647) (mod v_sep_~ret~0_BEFORE_RETURN_30 4294967296) (+ (mod v_sep_~ret~0_BEFORE_RETURN_30 4294967296) (- 4294967296))))) (or (not (= |ULTIMATE.start_main_~ret2~0#1| |ULTIMATE.start_main_~ret~1#1|)) (not (= |ULTIMATE.start_main_~ret5~0#1| |ULTIMATE.start_main_~ret~1#1|))) (<= 0 (+ |ULTIMATE.start_main_~ret~1#1| 2147483648)) (<= |#NULL.offset| 0) (<= |ULTIMATE.start_main_~ret~1#1| 2147483647) (= |ULTIMATE.start_main_~#x~0#1.offset| 0) (<= 0 (+ |ULTIMATE.start_main_~ret2~0#1| 2147483648)) (<= 10 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~temp~0#1| (select (select |#memory_int| |ULTIMATE.start_main_~#x~0#1.base|) (+ 36 |ULTIMATE.start_main_~#x~0#1.offset|))) (<= 0 |ULTIMATE.start_main_~#x~0#1.base|) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 19:40:53,490 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:40:53,490 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:40:53,490 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2021-11-25 19:40:53,490 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1642621402] [2021-11-25 19:40:53,490 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:40:53,490 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-25 19:40:53,491 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:40:53,491 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-25 19:40:53,491 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=366, Unknown=0, NotChecked=0, Total=462 [2021-11-25 19:40:53,491 INFO L87 Difference]: Start difference. First operand 37 states and 41 transitions. Second operand has 9 states, 9 states have (on average 2.5555555555555554) internal successors, (23), 9 states have internal predecessors, (23), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-25 19:40:53,537 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:40:53,537 INFO L93 Difference]: Finished difference Result 59 states and 67 transitions. [2021-11-25 19:40:53,537 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-25 19:40:53,538 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.5555555555555554) internal successors, (23), 9 states have internal predecessors, (23), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 62 [2021-11-25 19:40:53,538 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:40:53,539 INFO L225 Difference]: With dead ends: 59 [2021-11-25 19:40:53,539 INFO L226 Difference]: Without dead ends: 41 [2021-11-25 19:40:53,540 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 189 GetRequests, 169 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 160 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=96, Invalid=366, Unknown=0, NotChecked=0, Total=462 [2021-11-25 19:40:53,541 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:40:53,541 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 23 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 19:40:53,542 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-11-25 19:40:53,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2021-11-25 19:40:53,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 36 states have (on average 1.0833333333333333) internal successors, (39), 36 states have internal predecessors, (39), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-25 19:40:53,549 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2021-11-25 19:40:53,549 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 62 [2021-11-25 19:40:53,550 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:40:53,550 INFO L470 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2021-11-25 19:40:53,550 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.5555555555555554) internal successors, (23), 9 states have internal predecessors, (23), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-25 19:40:53,550 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2021-11-25 19:40:53,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-25 19:40:53,552 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:40:53,552 INFO L514 BasicCegarLoop]: trace histogram [30, 10, 6, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:40:53,587 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_291840ac-8e58-4aff-b3c5-6cb46cdbd1e6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-25 19:40:53,767 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_291840ac-8e58-4aff-b3c5-6cb46cdbd1e6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:40:53,767 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:40:53,768 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:40:53,768 INFO L85 PathProgramCache]: Analyzing trace with hash 798132220, now seen corresponding path program 6 times [2021-11-25 19:40:53,768 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:40:53,769 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1086151640] [2021-11-25 19:40:53,769 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:40:53,769 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:40:53,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:40:53,998 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 589 trivial. 0 not checked. [2021-11-25 19:40:53,998 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:40:53,999 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1086151640] [2021-11-25 19:40:53,999 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1086151640] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:40:53,999 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1200534186] [2021-11-25 19:40:53,999 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 19:40:53,999 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:40:54,000 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_291840ac-8e58-4aff-b3c5-6cb46cdbd1e6/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:40:54,000 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_291840ac-8e58-4aff-b3c5-6cb46cdbd1e6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:40:54,005 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_291840ac-8e58-4aff-b3c5-6cb46cdbd1e6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-25 19:40:54,222 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 19:40:54,222 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:40:54,225 INFO L263 TraceCheckSpWp]: Trace formula consists of 376 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 19:40:54,233 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:40:54,345 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 246 proven. 21 refuted. 0 times theorem prover too weak. 343 trivial. 0 not checked. [2021-11-25 19:40:54,346 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:40:54,486 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 589 trivial. 0 not checked. [2021-11-25 19:40:54,487 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1200534186] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:40:54,487 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [395637140] [2021-11-25 19:40:54,491 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 19:40:54,491 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:40:54,492 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:40:54,492 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:40:54,492 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:40:54,516 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:54,533 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 19:40:54,534 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 19:40:54,545 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:54,546 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2021-11-25 19:40:54,571 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:54,575 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 19:40:54,619 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:54,621 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:40:54,645 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 19:40:54,646 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 190 treesize of output 189 [2021-11-25 19:40:54,772 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 19:40:54,860 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:54,861 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 30 treesize of output 20 [2021-11-25 19:40:54,952 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:54,953 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:54,954 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:40:54,955 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 32 treesize of output 27 [2021-11-25 19:40:54,982 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:54,984 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:54,985 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:54,996 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:55,009 INFO L354 Elim1Store]: treesize reduction 57, result has 5.0 percent of original size [2021-11-25 19:40:55,010 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 80 treesize of output 72 [2021-11-25 19:40:55,040 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:55,041 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 24 [2021-11-25 19:40:55,054 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 19:40:55,236 INFO L197 IcfgInterpreter]: Interpreting procedure sep with input of size 12 for LOIs [2021-11-25 19:40:55,258 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:41:00,089 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2789#(and (<= 9 |ULTIMATE.start_main_~i~2#1|) (<= |ULTIMATE.start_main_~ret2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~#x~0#1.offset|) (or (not (= |ULTIMATE.start_main_~ret2~0#1| |ULTIMATE.start_main_~ret~1#1|)) (not (= |ULTIMATE.start_main_~ret5~0#1| |ULTIMATE.start_main_~ret~1#1|))) (<= 0 (+ |ULTIMATE.start_main_~ret~1#1| 2147483648)) (<= |#NULL.offset| 0) (<= 0 (+ |ULTIMATE.start_main_~ret5~0#1| 2147483648)) (<= |ULTIMATE.start_main_~ret~1#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~ret2~0#1| 2147483648)) (<= 10 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~ret5~0#1| 2147483647) (= |ULTIMATE.start_main_~temp~0#1| (select (select |#memory_int| |ULTIMATE.start_main_~#x~0#1.base|) (+ 36 |ULTIMATE.start_main_~#x~0#1.offset|))) (<= 0 |ULTIMATE.start_main_~#x~0#1.base|) (<= 0 |#NULL.offset|) (<= |ULTIMATE.start_main_~#x~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 19:41:00,090 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:41:00,090 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:41:00,090 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 12 [2021-11-25 19:41:00,090 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [549171524] [2021-11-25 19:41:00,090 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:41:00,091 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-25 19:41:00,091 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:41:00,092 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-25 19:41:00,092 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=474, Unknown=1, NotChecked=0, Total=600 [2021-11-25 19:41:00,093 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand has 12 states, 12 states have (on average 2.25) internal successors, (27), 12 states have internal predecessors, (27), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-25 19:41:00,148 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:41:00,148 INFO L93 Difference]: Finished difference Result 62 states and 69 transitions. [2021-11-25 19:41:00,149 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-25 19:41:00,149 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.25) internal successors, (27), 12 states have internal predecessors, (27), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 66 [2021-11-25 19:41:00,150 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:41:00,150 INFO L225 Difference]: With dead ends: 62 [2021-11-25 19:41:00,150 INFO L226 Difference]: Without dead ends: 44 [2021-11-25 19:41:00,151 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 205 GetRequests, 181 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 196 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=125, Invalid=474, Unknown=1, NotChecked=0, Total=600 [2021-11-25 19:41:00,152 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 31 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:41:00,152 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 34 Invalid, 31 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 19:41:00,153 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-11-25 19:41:00,158 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2021-11-25 19:41:00,158 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 39 states have (on average 1.0769230769230769) internal successors, (42), 39 states have internal predecessors, (42), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-25 19:41:00,159 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 48 transitions. [2021-11-25 19:41:00,159 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 48 transitions. Word has length 66 [2021-11-25 19:41:00,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:41:00,160 INFO L470 AbstractCegarLoop]: Abstraction has 44 states and 48 transitions. [2021-11-25 19:41:00,160 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.25) internal successors, (27), 12 states have internal predecessors, (27), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-25 19:41:00,161 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 48 transitions. [2021-11-25 19:41:00,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-25 19:41:00,162 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:41:00,163 INFO L514 BasicCegarLoop]: trace histogram [30, 10, 9, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:41:00,203 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_291840ac-8e58-4aff-b3c5-6cb46cdbd1e6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-25 19:41:00,387 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_291840ac-8e58-4aff-b3c5-6cb46cdbd1e6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-11-25 19:41:00,387 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:41:00,388 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:41:00,388 INFO L85 PathProgramCache]: Analyzing trace with hash -2088462254, now seen corresponding path program 7 times [2021-11-25 19:41:00,388 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:41:00,388 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1056740688] [2021-11-25 19:41:00,388 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:41:00,388 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:41:19,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat