./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-tiling/tcpy.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 839c364b Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/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_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-tiling/tcpy.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/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_8b8c0a8b-5e25-429d-aafa-e9051b16b605/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 a747677fdea16741fbb3fca3d9510254677728ef5906b9bf8e219064accd3a39 --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 20:25:32,394 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 20:25:32,396 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 20:25:32,427 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 20:25:32,428 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 20:25:32,429 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 20:25:32,431 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 20:25:32,434 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 20:25:32,437 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 20:25:32,438 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 20:25:32,439 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 20:25:32,441 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 20:25:32,441 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 20:25:32,443 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 20:25:32,445 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 20:25:32,446 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 20:25:32,448 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 20:25:32,449 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 20:25:32,451 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 20:25:32,454 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 20:25:32,456 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 20:25:32,461 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 20:25:32,464 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 20:25:32,466 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 20:25:32,471 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 20:25:32,479 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 20:25:32,480 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 20:25:32,481 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 20:25:32,483 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 20:25:32,485 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 20:25:32,486 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 20:25:32,487 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 20:25:32,488 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 20:25:32,490 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 20:25:32,492 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 20:25:32,492 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 20:25:32,493 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 20:25:32,493 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 20:25:32,494 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 20:25:32,495 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 20:25:32,495 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 20:25:32,496 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-25 20:25:32,546 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 20:25:32,546 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 20:25:32,547 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 20:25:32,547 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 20:25:32,554 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 20:25:32,555 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 20:25:32,555 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 20:25:32,555 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 20:25:32,555 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 20:25:32,556 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 20:25:32,557 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 20:25:32,557 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 20:25:32,557 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 20:25:32,557 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 20:25:32,558 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 20:25:32,558 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 20:25:32,558 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 20:25:32,559 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 20:25:32,559 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 20:25:32,560 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 20:25:32,560 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 20:25:32,560 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 20:25:32,560 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 20:25:32,561 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 20:25:32,561 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 20:25:32,561 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 20:25:32,566 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 20:25:32,567 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 20:25:32,567 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 20:25:32,567 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 20:25:32,567 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 20:25:32,568 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 20:25:32,568 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 20:25:32,568 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 20:25:32,569 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 20:25:32,569 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 20:25:32,569 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 20:25:32,569 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 20:25:32,570 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 20:25:32,570 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 20:25:32,570 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 20:25:32,570 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_8b8c0a8b-5e25-429d-aafa-e9051b16b605/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> a747677fdea16741fbb3fca3d9510254677728ef5906b9bf8e219064accd3a39 [2021-11-25 20:25:32,879 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 20:25:32,904 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 20:25:32,908 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 20:25:32,909 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 20:25:32,910 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 20:25:32,911 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/array-tiling/tcpy.c [2021-11-25 20:25:32,999 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/data/a15e9c6eb/cc717a4effce4aa1b83b5450c78989e4/FLAG7cb79f652 [2021-11-25 20:25:33,499 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 20:25:33,500 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/sv-benchmarks/c/array-tiling/tcpy.c [2021-11-25 20:25:33,511 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/data/a15e9c6eb/cc717a4effce4aa1b83b5450c78989e4/FLAG7cb79f652 [2021-11-25 20:25:33,863 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/data/a15e9c6eb/cc717a4effce4aa1b83b5450c78989e4 [2021-11-25 20:25:33,867 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 20:25:33,870 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 20:25:33,874 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 20:25:33,874 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 20:25:33,878 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 20:25:33,878 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 08:25:33" (1/1) ... [2021-11-25 20:25:33,880 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@446b335f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:25:33, skipping insertion in model container [2021-11-25 20:25:33,880 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 08:25:33" (1/1) ... [2021-11-25 20:25:33,888 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 20:25:33,903 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 20:25:34,092 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_8b8c0a8b-5e25-429d-aafa-e9051b16b605/sv-benchmarks/c/array-tiling/tcpy.c[395,408] [2021-11-25 20:25:34,109 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 20:25:34,118 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 20:25:34,131 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_8b8c0a8b-5e25-429d-aafa-e9051b16b605/sv-benchmarks/c/array-tiling/tcpy.c[395,408] [2021-11-25 20:25:34,139 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 20:25:34,152 INFO L208 MainTranslator]: Completed translation [2021-11-25 20:25:34,153 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:25:34 WrapperNode [2021-11-25 20:25:34,153 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 20:25:34,154 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 20:25:34,154 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 20:25:34,155 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 20:25:34,162 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:25:34" (1/1) ... [2021-11-25 20:25:34,169 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:25:34" (1/1) ... [2021-11-25 20:25:34,191 INFO L137 Inliner]: procedures = 16, calls = 25, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 82 [2021-11-25 20:25:34,192 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 20:25:34,193 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 20:25:34,193 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 20:25:34,193 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 20:25:34,204 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:25:34" (1/1) ... [2021-11-25 20:25:34,204 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:25:34" (1/1) ... [2021-11-25 20:25:34,207 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:25:34" (1/1) ... [2021-11-25 20:25:34,207 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:25:34" (1/1) ... [2021-11-25 20:25:34,214 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:25:34" (1/1) ... [2021-11-25 20:25:34,218 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:25:34" (1/1) ... [2021-11-25 20:25:34,223 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:25:34" (1/1) ... [2021-11-25 20:25:34,226 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 20:25:34,227 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 20:25:34,227 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 20:25:34,227 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 20:25:34,234 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:25:34" (1/1) ... [2021-11-25 20:25:34,242 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 20:25:34,253 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:25:34,276 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 20:25:34,313 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 20:25:34,338 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 20:25:34,338 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 20:25:34,338 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-25 20:25:34,338 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-11-25 20:25:34,338 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 20:25:34,338 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 20:25:34,339 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-25 20:25:34,415 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 20:25:34,417 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 20:25:34,656 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 20:25:34,690 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 20:25:34,691 INFO L301 CfgBuilder]: Removed 3 assume(true) statements. [2021-11-25 20:25:34,693 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 08:25:34 BoogieIcfgContainer [2021-11-25 20:25:34,693 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 20:25:34,695 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 20:25:34,695 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 20:25:34,698 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 20:25:34,698 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 08:25:33" (1/3) ... [2021-11-25 20:25:34,699 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@55fbc6e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 08:25:34, skipping insertion in model container [2021-11-25 20:25:34,699 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:25:34" (2/3) ... [2021-11-25 20:25:34,700 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@55fbc6e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 08:25:34, skipping insertion in model container [2021-11-25 20:25:34,700 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 08:25:34" (3/3) ... [2021-11-25 20:25:34,701 INFO L111 eAbstractionObserver]: Analyzing ICFG tcpy.c [2021-11-25 20:25:34,706 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 20:25:34,706 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-25 20:25:34,752 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 20:25:34,759 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 20:25:34,760 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-25 20:25:34,773 INFO L276 IsEmpty]: Start isEmpty. Operand has 13 states, 11 states have (on average 1.6363636363636365) internal successors, (18), 12 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:25:34,778 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-25 20:25:34,779 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:25:34,779 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:25:34,780 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:25:34,785 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:25:34,785 INFO L85 PathProgramCache]: Analyzing trace with hash -680536009, now seen corresponding path program 1 times [2021-11-25 20:25:34,794 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:25:34,795 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [234640672] [2021-11-25 20:25:34,795 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:25:34,796 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:25:34,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:25:34,986 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:25:34,987 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:25:34,987 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [234640672] [2021-11-25 20:25:34,988 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [234640672] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:25:34,989 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:25:34,989 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 20:25:34,991 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [857011975] [2021-11-25 20:25:34,992 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:25:34,995 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:25:34,996 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:25:35,028 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:25:35,030 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:25:35,033 INFO L87 Difference]: Start difference. First operand has 13 states, 11 states have (on average 1.6363636363636365) internal successors, (18), 12 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:25:35,096 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:25:35,096 INFO L93 Difference]: Finished difference Result 24 states and 33 transitions. [2021-11-25 20:25:35,097 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:25:35,099 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-11-25 20:25:35,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:25:35,107 INFO L225 Difference]: With dead ends: 24 [2021-11-25 20:25:35,107 INFO L226 Difference]: Without dead ends: 11 [2021-11-25 20:25:35,109 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 20:25:35,120 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 0 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:25:35,122 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 12 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 20:25:35,139 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2021-11-25 20:25:35,153 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2021-11-25 20:25:35,155 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11 states, 10 states have (on average 1.3) internal successors, (13), 10 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:25:35,156 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 13 transitions. [2021-11-25 20:25:35,157 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 13 transitions. Word has length 8 [2021-11-25 20:25:35,157 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:25:35,157 INFO L470 AbstractCegarLoop]: Abstraction has 11 states and 13 transitions. [2021-11-25 20:25:35,158 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:25:35,159 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 13 transitions. [2021-11-25 20:25:35,160 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-25 20:25:35,160 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:25:35,161 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:25:35,161 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-25 20:25:35,163 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:25:35,166 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:25:35,166 INFO L85 PathProgramCache]: Analyzing trace with hash 1007490258, now seen corresponding path program 1 times [2021-11-25 20:25:35,167 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:25:35,167 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [958376935] [2021-11-25 20:25:35,167 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:25:35,168 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:25:35,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:25:35,347 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:25:35,347 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:25:35,347 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [958376935] [2021-11-25 20:25:35,348 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [958376935] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:25:35,348 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [743598815] [2021-11-25 20:25:35,348 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:25:35,348 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:25:35,349 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:25:35,350 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:25:35,359 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 20:25:35,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:25:35,419 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-25 20:25:35,423 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:25:35,505 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:25:35,506 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:25:35,574 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:25:35,574 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [743598815] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:25:35,577 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [976279511] [2021-11-25 20:25:35,596 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-25 20:25:35,596 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:25:35,601 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:25:35,606 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:25:35,607 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:25:35,802 INFO L354 Elim1Store]: treesize reduction 97, result has 31.2 percent of original size [2021-11-25 20:25:35,803 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 29 treesize of output 60 [2021-11-25 20:25:35,947 INFO L354 Elim1Store]: treesize reduction 136, result has 24.9 percent of original size [2021-11-25 20:25:35,948 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 8 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 12 case distinctions, treesize of input 44 treesize of output 77 [2021-11-25 20:25:36,010 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 20:25:36,076 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:25:36,077 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 54 treesize of output 44 [2021-11-25 20:25:36,170 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 20:25:36,206 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:25:36,494 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [976279511] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:25:36,494 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:25:36,495 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [4, 4, 4] total 11 [2021-11-25 20:25:36,496 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1527512012] [2021-11-25 20:25:36,496 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:25:36,497 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 20:25:36,497 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:25:36,497 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 20:25:36,498 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=75, Unknown=0, NotChecked=0, Total=110 [2021-11-25 20:25:36,498 INFO L87 Difference]: Start difference. First operand 11 states and 13 transitions. Second operand has 6 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:25:36,764 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:25:36,765 INFO L93 Difference]: Finished difference Result 17 states and 20 transitions. [2021-11-25 20:25:36,766 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-25 20:25:36,766 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2021-11-25 20:25:36,766 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:25:36,767 INFO L225 Difference]: With dead ends: 17 [2021-11-25 20:25:36,767 INFO L226 Difference]: Without dead ends: 12 [2021-11-25 20:25:36,768 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=39, Invalid=93, Unknown=0, NotChecked=0, Total=132 [2021-11-25 20:25:36,769 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 5 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 38 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:25:36,770 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 12 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:25:36,771 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2021-11-25 20:25:36,773 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2021-11-25 20:25:36,773 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 11 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:25:36,774 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 14 transitions. [2021-11-25 20:25:36,774 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 14 transitions. Word has length 9 [2021-11-25 20:25:36,777 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:25:36,777 INFO L470 AbstractCegarLoop]: Abstraction has 12 states and 14 transitions. [2021-11-25 20:25:36,777 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:25:36,777 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 14 transitions. [2021-11-25 20:25:36,778 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-25 20:25:36,778 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:25:36,778 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:25:36,810 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-25 20:25:36,998 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-11-25 20:25:36,999 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:25:36,999 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:25:36,999 INFO L85 PathProgramCache]: Analyzing trace with hash 1160125243, now seen corresponding path program 1 times [2021-11-25 20:25:37,000 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:25:37,000 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [916203459] [2021-11-25 20:25:37,000 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:25:37,000 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:25:37,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:25:37,099 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 20:25:37,099 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:25:37,099 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [916203459] [2021-11-25 20:25:37,100 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [916203459] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:25:37,100 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1882819539] [2021-11-25 20:25:37,100 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:25:37,100 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:25:37,100 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:25:37,115 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:25:37,116 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-25 20:25:37,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:25:37,171 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-25 20:25:37,172 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:25:37,212 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 20:25:37,212 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:25:37,245 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 20:25:37,246 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1882819539] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:25:37,246 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1716863496] [2021-11-25 20:25:37,248 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-25 20:25:37,248 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:25:37,249 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:25:37,249 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:25:37,249 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:25:37,380 INFO L354 Elim1Store]: treesize reduction 97, result has 31.2 percent of original size [2021-11-25 20:25:37,381 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 29 treesize of output 60 [2021-11-25 20:25:37,552 INFO L354 Elim1Store]: treesize reduction 136, result has 24.9 percent of original size [2021-11-25 20:25:37,552 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 8 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 12 case distinctions, treesize of input 44 treesize of output 77 [2021-11-25 20:25:37,601 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 20:25:37,652 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:25:37,653 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 54 treesize of output 44 [2021-11-25 20:25:37,695 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 20:25:37,737 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:25:37,742 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:25:37,743 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:25:37,745 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:25:37,745 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:25:37,766 INFO L354 Elim1Store]: treesize reduction 44, result has 38.0 percent of original size [2021-11-25 20:25:37,769 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 46 treesize of output 53 [2021-11-25 20:25:37,830 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:25:37,836 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:25:37,838 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:25:37,839 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:25:37,840 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:25:37,841 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:25:37,842 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:25:37,844 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:25:37,845 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:25:37,846 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:25:37,847 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:25:37,849 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:25:37,850 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:25:37,851 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:25:37,853 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:25:37,854 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:25:37,856 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:25:37,886 INFO L354 Elim1Store]: treesize reduction 60, result has 31.0 percent of original size [2021-11-25 20:25:37,891 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 6 select indices, 6 select index equivalence classes, 7 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 17 case distinctions, treesize of input 502 treesize of output 520 [2021-11-25 20:25:37,983 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:25:37,989 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:25:37,990 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:25:37,992 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:25:37,993 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:25:38,016 INFO L354 Elim1Store]: treesize reduction 44, result has 38.0 percent of original size [2021-11-25 20:25:38,020 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 46 treesize of output 53 [2021-11-25 20:25:38,056 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:25:38,548 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '228#(and (<= 0 |#NULL.base|) (= |ULTIMATE.start_main_~i~0#1| 0) (<= 0 |ULTIMATE.start_main_~a~0#1.offset|) (= |ULTIMATE.start_main_#t~mem13#1| (select (select |#memory_int| |ULTIMATE.start_main_~acopy~0#1.base|) (+ (* |ULTIMATE.start_main_~i~0#1| 4) |ULTIMATE.start_main_~acopy~0#1.offset|))) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~a~0#1.base|) (+ |ULTIMATE.start_main_~a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem14#1|) (<= 100000 ~MAX~0) (<= ~SIZE~0 100000) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (<= 0 |ULTIMATE.start_main_~acopy~0#1.offset|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_#t~mem14#1| |ULTIMATE.start_main_#t~mem13#1|) 1 0)) (<= |#NULL.base| 0) (<= |ULTIMATE.start_main_~acopy~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0) (<= 0 |#NULL.offset|) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (<= |ULTIMATE.start_main_~a~0#1.offset| 0) (<= ~MAX~0 100000))' at error location [2021-11-25 20:25:38,548 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:25:38,549 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:25:38,549 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2021-11-25 20:25:38,549 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1296556727] [2021-11-25 20:25:38,549 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:25:38,550 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-25 20:25:38,551 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:25:38,551 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-25 20:25:38,554 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=134, Unknown=0, NotChecked=0, Total=182 [2021-11-25 20:25:38,554 INFO L87 Difference]: Start difference. First operand 12 states and 14 transitions. Second operand has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 7 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:25:38,590 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:25:38,591 INFO L93 Difference]: Finished difference Result 21 states and 25 transitions. [2021-11-25 20:25:38,592 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 20:25:38,596 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 7 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2021-11-25 20:25:38,597 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:25:38,597 INFO L225 Difference]: With dead ends: 21 [2021-11-25 20:25:38,597 INFO L226 Difference]: Without dead ends: 13 [2021-11-25 20:25:38,599 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=48, Invalid=134, Unknown=0, NotChecked=0, Total=182 [2021-11-25 20:25:38,604 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 3 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:25:38,605 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 14 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 20:25:38,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2021-11-25 20:25:38,612 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2021-11-25 20:25:38,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.25) internal successors, (15), 12 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:25:38,617 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 15 transitions. [2021-11-25 20:25:38,618 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 15 transitions. Word has length 10 [2021-11-25 20:25:38,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:25:38,619 INFO L470 AbstractCegarLoop]: Abstraction has 13 states and 15 transitions. [2021-11-25 20:25:38,619 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 7 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:25:38,619 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 15 transitions. [2021-11-25 20:25:38,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-25 20:25:38,620 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:25:38,620 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:25:38,658 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-25 20:25:38,836 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:25:38,837 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:25:38,837 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:25:38,837 INFO L85 PathProgramCache]: Analyzing trace with hash -144270058, now seen corresponding path program 2 times [2021-11-25 20:25:38,837 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:25:38,838 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [491588504] [2021-11-25 20:25:38,838 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:25:38,838 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:25:38,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:25:39,076 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 20:25:39,076 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:25:39,077 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [491588504] [2021-11-25 20:25:39,077 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [491588504] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:25:39,077 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [802314566] [2021-11-25 20:25:39,077 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:25:39,078 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:25:39,078 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:25:39,079 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:25:39,084 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-25 20:25:39,143 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-25 20:25:39,143 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:25:39,144 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-25 20:25:39,147 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:25:39,161 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 20:25:39,210 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:25:39,224 INFO L354 Elim1Store]: treesize reduction 26, result has 40.9 percent of original size [2021-11-25 20:25:39,224 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 1 case distinctions, treesize of input 23 treesize of output 33 [2021-11-25 20:25:39,286 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 20:25:39,287 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:25:39,339 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:25:39,339 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 474 treesize of output 450 [2021-11-25 20:25:39,351 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 220 treesize of output 184 [2021-11-25 20:25:46,828 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:25:46,829 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 970 treesize of output 926 [2021-11-25 20:25:49,151 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:25:49,155 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:25:49,156 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 1 [2021-11-25 20:25:49,206 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 20:25:49,207 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [802314566] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:25:49,207 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2117056963] [2021-11-25 20:25:49,210 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-25 20:25:49,211 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:25:49,211 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:25:49,211 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:25:49,212 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:25:49,347 INFO L354 Elim1Store]: treesize reduction 136, result has 24.9 percent of original size [2021-11-25 20:25:49,347 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 8 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 12 case distinctions, treesize of input 44 treesize of output 77 [2021-11-25 20:25:49,368 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 12 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 39 [2021-11-25 20:25:49,435 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 9 select indices, 9 select index equivalence classes, 26 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 0 case distinctions, treesize of input 75 treesize of output 98 [2021-11-25 20:25:49,542 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:25:49,543 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:25:49,544 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:25:49,546 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:25:49,547 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:25:49,548 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:25:49,599 INFO L354 Elim1Store]: treesize reduction 138, result has 20.2 percent of original size [2021-11-25 20:25:49,599 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 26 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 13 case distinctions, treesize of input 418 treesize of output 410 [2021-11-25 20:25:49,760 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:25:49,781 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:25:49,784 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:25:49,785 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:25:49,786 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:25:49,787 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:25:49,803 INFO L354 Elim1Store]: treesize reduction 44, result has 38.0 percent of original size [2021-11-25 20:25:49,804 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 46 treesize of output 53 [2021-11-25 20:25:49,836 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:25:49,841 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:25:49,842 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:25:49,843 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:25:49,844 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:25:49,845 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:25:49,846 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:25:49,847 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:25:49,848 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:25:49,850 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:25:49,851 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:25:49,852 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:25:49,853 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:25:49,854 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:25:49,855 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:25:49,857 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:25:49,857 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:25:49,887 INFO L354 Elim1Store]: treesize reduction 60, result has 31.0 percent of original size [2021-11-25 20:25:49,888 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 6 select indices, 6 select index equivalence classes, 7 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 17 case distinctions, treesize of input 532 treesize of output 550 [2021-11-25 20:25:49,943 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:25:49,946 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:25:49,948 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:25:49,949 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:25:49,949 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:25:49,966 INFO L354 Elim1Store]: treesize reduction 44, result has 38.0 percent of original size [2021-11-25 20:25:49,966 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 46 treesize of output 53 [2021-11-25 20:25:49,990 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:25:50,349 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '356#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= |ULTIMATE.start_main_~i~0#1| 0) (= ~MAX~0 100000) (= |ULTIMATE.start_main_#t~mem13#1| (select (select |#memory_int| |ULTIMATE.start_main_~acopy~0#1.base|) (+ (* |ULTIMATE.start_main_~i~0#1| 4) |ULTIMATE.start_main_~acopy~0#1.offset|))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~a~0#1.base|) (+ |ULTIMATE.start_main_~a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem14#1|) (<= ~SIZE~0 100000) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (= |ULTIMATE.start_main_~acopy~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_#t~mem14#1| |ULTIMATE.start_main_#t~mem13#1|) 1 0)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0))' at error location [2021-11-25 20:25:50,349 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:25:50,349 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:25:50,350 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 12 [2021-11-25 20:25:50,350 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [950358581] [2021-11-25 20:25:50,350 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:25:50,350 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-25 20:25:50,350 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:25:50,351 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-25 20:25:50,351 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=269, Unknown=0, NotChecked=0, Total=342 [2021-11-25 20:25:50,351 INFO L87 Difference]: Start difference. First operand 13 states and 15 transitions. Second operand has 12 states, 12 states have (on average 1.5833333333333333) internal successors, (19), 12 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:25:50,466 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:25:50,466 INFO L93 Difference]: Finished difference Result 19 states and 21 transitions. [2021-11-25 20:25:50,467 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-25 20:25:50,467 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.5833333333333333) internal successors, (19), 12 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-11-25 20:25:50,467 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:25:50,468 INFO L225 Difference]: With dead ends: 19 [2021-11-25 20:25:50,468 INFO L226 Difference]: Without dead ends: 17 [2021-11-25 20:25:50,468 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 18 SyntacticMatches, 3 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 117 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=103, Invalid=359, Unknown=0, NotChecked=0, Total=462 [2021-11-25 20:25:50,469 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 11 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 71 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 59 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:25:50,470 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 14 Invalid, 71 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 59 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:25:50,470 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-11-25 20:25:50,473 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 15. [2021-11-25 20:25:50,473 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 14 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:25:50,474 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2021-11-25 20:25:50,480 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 11 [2021-11-25 20:25:50,480 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:25:50,481 INFO L470 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2021-11-25 20:25:50,481 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 1.5833333333333333) internal successors, (19), 12 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:25:50,481 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2021-11-25 20:25:50,482 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-25 20:25:50,482 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:25:50,482 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:25:50,507 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-25 20:25:50,694 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:25:50,695 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:25:50,695 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:25:50,695 INFO L85 PathProgramCache]: Analyzing trace with hash 1318200786, now seen corresponding path program 1 times [2021-11-25 20:25:50,695 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:25:50,695 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [892067436] [2021-11-25 20:25:50,695 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:25:50,696 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:25:50,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:25:51,191 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:25:51,191 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:25:51,192 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [892067436] [2021-11-25 20:25:51,192 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [892067436] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:25:51,192 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1524743183] [2021-11-25 20:25:51,192 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:25:51,192 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:25:51,193 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:25:51,194 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:25:51,217 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-25 20:25:51,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:25:51,258 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-25 20:25:51,260 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:25:51,271 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 20:25:51,331 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-25 20:25:51,434 INFO L354 Elim1Store]: treesize reduction 32, result has 27.3 percent of original size [2021-11-25 20:25:51,435 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 1 case distinctions, treesize of input 28 treesize of output 32 [2021-11-25 20:25:51,650 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:25:51,657 INFO L354 Elim1Store]: treesize reduction 12, result has 20.0 percent of original size [2021-11-25 20:25:51,658 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 57 treesize of output 23 [2021-11-25 20:25:51,681 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:25:51,682 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:25:53,797 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_109 Int) (|ULTIMATE.start_main_~acopy~0#1.offset| Int)) (let ((.cse0 (store (let ((.cse1 (* c_~SIZE~0 4)) (.cse2 (* |c_ULTIMATE.start_main_~i~0#1| (- 4)))) (store (select |c_#memory_int| |c_ULTIMATE.start_main_~acopy~0#1.base|) (+ .cse1 .cse2 (- 4) |ULTIMATE.start_main_~acopy~0#1.offset|) (select (select |c_#memory_int| |c_ULTIMATE.start_main_~a~0#1.base|) (+ |c_ULTIMATE.start_main_~a~0#1.offset| .cse1 .cse2 (- 4))))) (+ (* |c_ULTIMATE.start_main_~i~0#1| 4) |ULTIMATE.start_main_~acopy~0#1.offset|) v_ArrVal_109))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~acopy~0#1.base| .cse0) |c_ULTIMATE.start_main_~a~0#1.base|) (+ |c_ULTIMATE.start_main_~a~0#1.offset| 4)) (select .cse0 (+ |ULTIMATE.start_main_~acopy~0#1.offset| 4))))) is different from false [2021-11-25 20:26:16,545 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:26:16,546 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 596 treesize of output 491 [2021-11-25 20:26:16,601 INFO L354 Elim1Store]: treesize reduction 58, result has 52.5 percent of original size [2021-11-25 20:26:16,602 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 4 case distinctions, treesize of input 809 treesize of output 781 [2021-11-25 20:26:16,618 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:26:16,618 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 855 treesize of output 803 [2021-11-25 20:27:07,998 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 1596 treesize of output 1524 [2021-11-25 20:28:20,602 INFO L354 Elim1Store]: treesize reduction 36, result has 74.5 percent of original size [2021-11-25 20:28:20,603 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 1682 treesize of output 1575 [2021-11-25 20:28:25,221 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 1 not checked. [2021-11-25 20:28:25,222 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1524743183] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:28:25,222 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [166546654] [2021-11-25 20:28:25,224 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 20:28:25,224 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:28:25,224 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:28:25,225 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:28:25,225 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:28:25,309 INFO L354 Elim1Store]: treesize reduction 97, result has 31.2 percent of original size [2021-11-25 20:28:25,310 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 29 treesize of output 60 [2021-11-25 20:28:25,427 INFO L354 Elim1Store]: treesize reduction 136, result has 24.9 percent of original size [2021-11-25 20:28:25,428 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 8 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 12 case distinctions, treesize of input 44 treesize of output 77 [2021-11-25 20:28:25,453 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 20:28:25,474 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:25,475 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 54 treesize of output 44 [2021-11-25 20:28:25,499 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 20:28:25,517 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:25,520 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:25,520 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:28:25,521 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:28:25,536 INFO L354 Elim1Store]: treesize reduction 37, result has 35.1 percent of original size [2021-11-25 20:28:25,536 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 3 case distinctions, treesize of input 32 treesize of output 39 [2021-11-25 20:28:25,560 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:25,577 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:28:25,578 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:25,580 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:25,582 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:25,583 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:28:25,584 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:25,587 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:25,589 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:25,590 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:28:25,592 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:25,593 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:25,595 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:28:25,717 INFO L354 Elim1Store]: treesize reduction 264, result has 26.1 percent of original size [2021-11-25 20:28:25,718 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 6 select indices, 6 select index equivalence classes, 5 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 21 case distinctions, treesize of input 520 treesize of output 566 [2021-11-25 20:28:25,796 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:25,799 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:28:25,800 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:25,801 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:25,802 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:28:25,819 INFO L354 Elim1Store]: treesize reduction 44, result has 38.0 percent of original size [2021-11-25 20:28:25,819 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 46 treesize of output 53 [2021-11-25 20:28:25,954 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:28:26,575 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '524#(and (<= 0 |#NULL.base|) (<= 0 |ULTIMATE.start_main_~a~0#1.offset|) (<= 1 ~SIZE~0) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 100000 ~MAX~0) (<= ~SIZE~0 100000) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (<= 0 |ULTIMATE.start_main_~acopy~0#1.offset|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (<= |#NULL.base| 0) (<= |ULTIMATE.start_main_~acopy~0#1.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#NULL.offset|) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (<= |ULTIMATE.start_main_~a~0#1.offset| 0) (<= ~MAX~0 100000))' at error location [2021-11-25 20:28:26,575 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:28:26,576 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:28:26,576 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 28 [2021-11-25 20:28:26,576 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1856682538] [2021-11-25 20:28:26,576 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:28:26,577 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-25 20:28:26,577 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:28:26,577 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-25 20:28:26,578 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=146, Invalid=1031, Unknown=17, NotChecked=66, Total=1260 [2021-11-25 20:28:26,579 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand has 28 states, 28 states have (on average 1.3214285714285714) internal successors, (37), 28 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:28:27,935 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:28:27,935 INFO L93 Difference]: Finished difference Result 28 states and 32 transitions. [2021-11-25 20:28:27,944 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-25 20:28:27,944 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.3214285714285714) internal successors, (37), 28 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2021-11-25 20:28:27,944 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:28:27,945 INFO L225 Difference]: With dead ends: 28 [2021-11-25 20:28:27,945 INFO L226 Difference]: Without dead ends: 26 [2021-11-25 20:28:27,946 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 17 SyntacticMatches, 2 SemanticMatches, 42 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 465 ImplicationChecksByTransitivity, 29.8s TimeCoverageRelationStatistics Valid=232, Invalid=1560, Unknown=18, NotChecked=82, Total=1892 [2021-11-25 20:28:27,947 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 9 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 159 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 234 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 159 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 55 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:28:27,947 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 61 Invalid, 234 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 159 Invalid, 0 Unknown, 55 Unchecked, 0.1s Time] [2021-11-25 20:28:27,947 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-11-25 20:28:27,951 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 22. [2021-11-25 20:28:27,951 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 21 states have (on average 1.2380952380952381) internal successors, (26), 21 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:28:27,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 26 transitions. [2021-11-25 20:28:27,952 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 26 transitions. Word has length 14 [2021-11-25 20:28:27,952 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:28:27,952 INFO L470 AbstractCegarLoop]: Abstraction has 22 states and 26 transitions. [2021-11-25 20:28:27,952 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 1.3214285714285714) internal successors, (37), 28 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:28:27,952 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 26 transitions. [2021-11-25 20:28:27,953 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-25 20:28:27,953 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:28:27,953 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:28:27,976 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-25 20:28:28,158 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:28:28,159 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:28:28,159 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:28:28,159 INFO L85 PathProgramCache]: Analyzing trace with hash -723615791, now seen corresponding path program 2 times [2021-11-25 20:28:28,160 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:28:28,160 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [629893580] [2021-11-25 20:28:28,160 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:28:28,160 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:28:28,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:28:28,360 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:28:28,360 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:28:28,360 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [629893580] [2021-11-25 20:28:28,360 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [629893580] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:28:28,360 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [725116269] [2021-11-25 20:28:28,361 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:28:28,361 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:28:28,361 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:28:28,366 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:28:28,382 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-25 20:28:28,429 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-25 20:28:28,430 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:28:28,431 INFO L263 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 20:28:28,432 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:28:28,575 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:28:28,575 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:28:28,763 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:28:28,763 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [725116269] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:28:28,763 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [417211712] [2021-11-25 20:28:28,765 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 20:28:28,765 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:28:28,765 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:28:28,766 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:28:28,766 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:28:28,869 INFO L354 Elim1Store]: treesize reduction 97, result has 31.2 percent of original size [2021-11-25 20:28:28,870 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 29 treesize of output 60 [2021-11-25 20:28:28,957 INFO L354 Elim1Store]: treesize reduction 136, result has 24.9 percent of original size [2021-11-25 20:28:28,958 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 8 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 12 case distinctions, treesize of input 44 treesize of output 77 [2021-11-25 20:28:28,978 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 20:28:29,011 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:29,012 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 54 treesize of output 44 [2021-11-25 20:28:29,031 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 20:28:29,050 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:29,053 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:28:29,054 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:29,055 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:29,056 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:28:29,071 INFO L354 Elim1Store]: treesize reduction 44, result has 38.0 percent of original size [2021-11-25 20:28:29,071 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 46 treesize of output 53 [2021-11-25 20:28:29,100 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:29,104 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:29,105 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:29,106 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:28:29,107 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:29,108 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:29,108 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:28:29,109 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:29,110 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:29,111 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:29,112 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:29,113 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:29,113 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:29,114 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:28:29,115 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:29,116 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:29,117 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:28:29,138 INFO L354 Elim1Store]: treesize reduction 60, result has 31.0 percent of original size [2021-11-25 20:28:29,138 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 6 select indices, 6 select index equivalence classes, 7 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 17 case distinctions, treesize of input 502 treesize of output 520 [2021-11-25 20:28:29,181 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:29,183 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:28:29,184 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:29,194 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:29,195 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:28:29,211 INFO L354 Elim1Store]: treesize reduction 44, result has 38.0 percent of original size [2021-11-25 20:28:29,212 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 46 treesize of output 53 [2021-11-25 20:28:29,347 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:28:29,934 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '728#(and (<= 0 |#NULL.base|) (<= 0 |ULTIMATE.start_main_~a~0#1.offset|) (<= 1 ~SIZE~0) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 100000 ~MAX~0) (<= ~SIZE~0 100000) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (<= 0 |ULTIMATE.start_main_~acopy~0#1.offset|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (<= |#NULL.base| 0) (<= |ULTIMATE.start_main_~acopy~0#1.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#NULL.offset|) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (<= |ULTIMATE.start_main_~a~0#1.offset| 0) (<= ~MAX~0 100000))' at error location [2021-11-25 20:28:29,934 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:28:29,934 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:28:29,934 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 20 [2021-11-25 20:28:29,935 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1597994468] [2021-11-25 20:28:29,935 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:28:29,935 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-25 20:28:29,935 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:28:29,936 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-25 20:28:29,936 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=630, Unknown=0, NotChecked=0, Total=756 [2021-11-25 20:28:29,937 INFO L87 Difference]: Start difference. First operand 22 states and 26 transitions. Second operand has 20 states, 20 states have (on average 1.4) internal successors, (28), 20 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:28:30,127 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:28:30,127 INFO L93 Difference]: Finished difference Result 52 states and 59 transitions. [2021-11-25 20:28:30,128 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-25 20:28:30,128 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.4) internal successors, (28), 20 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2021-11-25 20:28:30,128 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:28:30,129 INFO L225 Difference]: With dead ends: 52 [2021-11-25 20:28:30,129 INFO L226 Difference]: Without dead ends: 44 [2021-11-25 20:28:30,130 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 293 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=188, Invalid=804, Unknown=0, NotChecked=0, Total=992 [2021-11-25 20:28:30,130 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 52 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 100 mSolverCounterSat, 52 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 152 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 52 IncrementalHoareTripleChecker+Valid, 100 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:28:30,131 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [52 Valid, 39 Invalid, 152 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [52 Valid, 100 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:28:30,131 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-11-25 20:28:30,141 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 26. [2021-11-25 20:28:30,142 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 25 states have (on average 1.2) internal successors, (30), 25 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:28:30,150 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 30 transitions. [2021-11-25 20:28:30,151 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 30 transitions. Word has length 15 [2021-11-25 20:28:30,151 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:28:30,151 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 30 transitions. [2021-11-25 20:28:30,151 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.4) internal successors, (28), 20 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:28:30,151 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 30 transitions. [2021-11-25 20:28:30,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-25 20:28:30,152 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:28:30,152 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:28:30,188 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-25 20:28:30,366 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:28:30,367 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:28:30,367 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:28:30,367 INFO L85 PathProgramCache]: Analyzing trace with hash 112738861, now seen corresponding path program 3 times [2021-11-25 20:28:30,367 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:28:30,367 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [802329577] [2021-11-25 20:28:30,367 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:28:30,368 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:28:30,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:28:30,514 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 6 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:28:30,515 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:28:30,515 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [802329577] [2021-11-25 20:28:30,515 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [802329577] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:28:30,515 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2046008830] [2021-11-25 20:28:30,515 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:28:30,515 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:28:30,516 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:28:30,516 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:28:30,526 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-25 20:28:30,568 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:28:30,569 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:28:30,570 INFO L263 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-25 20:28:30,571 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:28:30,578 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 16 [2021-11-25 20:28:30,653 INFO L354 Elim1Store]: treesize reduction 49, result has 23.4 percent of original size [2021-11-25 20:28:30,653 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 1 case distinctions, treesize of input 38 treesize of output 42 [2021-11-25 20:28:31,117 INFO L354 Elim1Store]: treesize reduction 42, result has 14.3 percent of original size [2021-11-25 20:28:31,117 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 80 treesize of output 26 [2021-11-25 20:28:31,138 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 20:28:31,139 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:28:31,279 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:28:31,279 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 590 treesize of output 558 [2021-11-25 20:28:33,174 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:28:33,174 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 120 treesize of output 104 [2021-11-25 20:28:33,177 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 464 treesize of output 448 [2021-11-25 20:28:33,412 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:28:33,412 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 89 treesize of output 93 [2021-11-25 20:28:33,741 INFO L354 Elim1Store]: treesize reduction 17, result has 65.3 percent of original size [2021-11-25 20:28:33,741 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 260 treesize of output 227 [2021-11-25 20:28:33,925 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:33,926 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 112 treesize of output 78 [2021-11-25 20:28:33,929 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:33,930 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:28:34,168 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 20:28:34,169 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2046008830] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:28:34,169 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1433813632] [2021-11-25 20:28:34,171 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 20:28:34,171 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:28:34,171 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:28:34,171 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:28:34,172 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:28:34,259 INFO L354 Elim1Store]: treesize reduction 97, result has 31.2 percent of original size [2021-11-25 20:28:34,260 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 29 treesize of output 60 [2021-11-25 20:28:34,348 INFO L354 Elim1Store]: treesize reduction 136, result has 24.9 percent of original size [2021-11-25 20:28:34,349 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 8 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 12 case distinctions, treesize of input 44 treesize of output 77 [2021-11-25 20:28:34,383 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 20:28:34,409 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:34,410 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 54 treesize of output 44 [2021-11-25 20:28:34,431 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 20:28:34,456 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:34,460 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:34,461 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:28:34,461 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:28:34,477 INFO L354 Elim1Store]: treesize reduction 37, result has 35.1 percent of original size [2021-11-25 20:28:34,477 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 3 case distinctions, treesize of input 32 treesize of output 39 [2021-11-25 20:28:34,497 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:34,505 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:34,506 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:28:34,508 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:34,509 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:34,509 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:28:34,510 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:34,518 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:34,519 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:34,520 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:28:34,521 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:34,522 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:34,522 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:28:34,605 INFO L354 Elim1Store]: treesize reduction 264, result has 26.1 percent of original size [2021-11-25 20:28:34,606 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 6 select indices, 6 select index equivalence classes, 5 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 21 case distinctions, treesize of input 520 treesize of output 566 [2021-11-25 20:28:34,697 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:34,700 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:28:34,700 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:34,701 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:34,702 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:28:34,718 INFO L354 Elim1Store]: treesize reduction 44, result has 38.0 percent of original size [2021-11-25 20:28:34,718 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 46 treesize of output 53 [2021-11-25 20:28:34,839 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:28:35,437 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '962#(and (<= 0 |#NULL.base|) (<= 0 |ULTIMATE.start_main_~a~0#1.offset|) (<= 1 ~SIZE~0) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 100000 ~MAX~0) (<= ~SIZE~0 100000) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (<= 0 |ULTIMATE.start_main_~acopy~0#1.offset|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (<= |#NULL.base| 0) (<= |ULTIMATE.start_main_~acopy~0#1.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#NULL.offset|) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (<= |ULTIMATE.start_main_~a~0#1.offset| 0) (<= ~MAX~0 100000))' at error location [2021-11-25 20:28:35,437 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:28:35,437 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:28:35,437 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 19 [2021-11-25 20:28:35,437 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [398582350] [2021-11-25 20:28:35,438 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:28:35,438 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-25 20:28:35,438 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:28:35,439 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-25 20:28:35,439 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=614, Unknown=0, NotChecked=0, Total=702 [2021-11-25 20:28:35,440 INFO L87 Difference]: Start difference. First operand 26 states and 30 transitions. Second operand has 19 states, 19 states have (on average 1.8421052631578947) internal successors, (35), 19 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:28:35,730 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:28:35,730 INFO L93 Difference]: Finished difference Result 38 states and 43 transitions. [2021-11-25 20:28:35,735 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-25 20:28:35,735 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.8421052631578947) internal successors, (35), 19 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2021-11-25 20:28:35,735 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:28:35,736 INFO L225 Difference]: With dead ends: 38 [2021-11-25 20:28:35,736 INFO L226 Difference]: Without dead ends: 28 [2021-11-25 20:28:35,737 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 26 SyntacticMatches, 1 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 228 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=157, Invalid=1033, Unknown=0, NotChecked=0, Total=1190 [2021-11-25 20:28:35,737 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 4 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 105 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 129 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 105 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 12 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:28:35,738 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4 Valid, 27 Invalid, 129 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 105 Invalid, 0 Unknown, 12 Unchecked, 0.1s Time] [2021-11-25 20:28:35,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-11-25 20:28:35,744 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 24. [2021-11-25 20:28:35,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 23 states have (on average 1.173913043478261) internal successors, (27), 23 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:28:35,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 27 transitions. [2021-11-25 20:28:35,745 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 27 transitions. Word has length 15 [2021-11-25 20:28:35,745 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:28:35,745 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 27 transitions. [2021-11-25 20:28:35,746 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.8421052631578947) internal successors, (35), 19 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:28:35,746 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 27 transitions. [2021-11-25 20:28:35,746 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-25 20:28:35,746 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:28:35,747 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:28:35,778 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-25 20:28:35,974 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-11-25 20:28:35,975 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:28:35,975 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:28:35,975 INFO L85 PathProgramCache]: Analyzing trace with hash 1638863766, now seen corresponding path program 4 times [2021-11-25 20:28:35,975 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:28:35,975 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1107727110] [2021-11-25 20:28:35,975 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:28:35,975 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:28:35,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:28:36,049 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 3 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 20:28:36,049 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:28:36,049 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1107727110] [2021-11-25 20:28:36,049 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1107727110] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:28:36,050 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [211128363] [2021-11-25 20:28:36,050 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:28:36,050 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:28:36,050 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:28:36,051 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:28:36,077 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-25 20:28:36,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:28:36,123 INFO L263 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 20:28:36,124 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:28:36,207 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 20:28:36,207 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:28:36,249 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 20:28:36,249 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [211128363] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:28:36,250 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [71348800] [2021-11-25 20:28:36,252 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 20:28:36,252 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:28:36,252 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:28:36,252 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:28:36,252 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:28:36,375 INFO L354 Elim1Store]: treesize reduction 136, result has 24.9 percent of original size [2021-11-25 20:28:36,376 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 8 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 12 case distinctions, treesize of input 44 treesize of output 77 [2021-11-25 20:28:36,391 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 12 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 39 [2021-11-25 20:28:36,436 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 9 select indices, 9 select index equivalence classes, 26 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 0 case distinctions, treesize of input 80 treesize of output 103 [2021-11-25 20:28:36,550 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:36,552 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:36,553 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:36,554 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:36,555 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:36,556 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:36,558 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:36,559 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:36,560 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:36,561 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:36,562 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:36,598 INFO L354 Elim1Store]: treesize reduction 153, result has 12.6 percent of original size [2021-11-25 20:28:36,599 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 32 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 12 case distinctions, treesize of input 428 treesize of output 409 [2021-11-25 20:28:36,685 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 20:28:36,705 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:36,708 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:28:36,710 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:36,711 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:36,711 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:28:36,727 INFO L354 Elim1Store]: treesize reduction 44, result has 38.0 percent of original size [2021-11-25 20:28:36,728 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 46 treesize of output 53 [2021-11-25 20:28:36,759 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:36,764 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:36,765 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:36,767 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:28:36,768 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:36,769 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:36,769 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:28:36,770 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:36,771 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:36,772 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:36,773 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:36,774 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:36,774 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:36,775 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:28:36,776 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:36,777 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:36,777 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:28:36,799 INFO L354 Elim1Store]: treesize reduction 60, result has 31.0 percent of original size [2021-11-25 20:28:36,799 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 6 select indices, 6 select index equivalence classes, 7 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 17 case distinctions, treesize of input 532 treesize of output 550 [2021-11-25 20:28:36,846 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:36,848 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:28:36,849 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:36,850 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:36,850 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:28:36,864 INFO L354 Elim1Store]: treesize reduction 44, result has 38.0 percent of original size [2021-11-25 20:28:36,865 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 46 treesize of output 53 [2021-11-25 20:28:37,007 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:28:37,480 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1190#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (= |ULTIMATE.start_main_~acopy~0#1.offset| 0) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0))' at error location [2021-11-25 20:28:37,480 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:28:37,480 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:28:37,480 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2021-11-25 20:28:37,481 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2004310532] [2021-11-25 20:28:37,481 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:28:37,481 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-25 20:28:37,481 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:28:37,482 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-25 20:28:37,482 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=377, Unknown=0, NotChecked=0, Total=462 [2021-11-25 20:28:37,482 INFO L87 Difference]: Start difference. First operand 24 states and 27 transitions. Second operand has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 14 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:28:37,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:28:37,573 INFO L93 Difference]: Finished difference Result 45 states and 49 transitions. [2021-11-25 20:28:37,574 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-25 20:28:37,574 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 14 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2021-11-25 20:28:37,574 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:28:37,575 INFO L225 Difference]: With dead ends: 45 [2021-11-25 20:28:37,575 INFO L226 Difference]: Without dead ends: 30 [2021-11-25 20:28:37,576 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 170 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=112, Invalid=488, Unknown=0, NotChecked=0, Total=600 [2021-11-25 20:28:37,576 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 27 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 66 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 104 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 66 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:28:37,577 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 28 Invalid, 104 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 66 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:28:37,577 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-11-25 20:28:37,582 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 18. [2021-11-25 20:28:37,582 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 17 states have (on average 1.1764705882352942) internal successors, (20), 17 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:28:37,582 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2021-11-25 20:28:37,583 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 17 [2021-11-25 20:28:37,583 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:28:37,583 INFO L470 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2021-11-25 20:28:37,583 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 14 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:28:37,583 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2021-11-25 20:28:37,584 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-25 20:28:37,584 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:28:37,584 INFO L514 BasicCegarLoop]: trace histogram [4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:28:37,612 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-25 20:28:37,798 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2021-11-25 20:28:37,799 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:28:37,799 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:28:37,799 INFO L85 PathProgramCache]: Analyzing trace with hash 1754030193, now seen corresponding path program 5 times [2021-11-25 20:28:37,799 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:28:37,799 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1337741512] [2021-11-25 20:28:37,799 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:28:37,799 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:28:37,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:28:38,043 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 20:28:38,043 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:28:38,043 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1337741512] [2021-11-25 20:28:38,043 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1337741512] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:28:38,043 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1172968752] [2021-11-25 20:28:38,044 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:28:38,044 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:28:38,044 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:28:38,044 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:28:38,045 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-25 20:28:38,105 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-25 20:28:38,105 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:28:38,107 INFO L263 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-25 20:28:38,109 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:28:38,117 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 20:28:38,196 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:38,208 INFO L354 Elim1Store]: treesize reduction 39, result has 39.1 percent of original size [2021-11-25 20:28:38,208 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 1 case distinctions, treesize of input 34 treesize of output 48 [2021-11-25 20:28:38,308 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 20:28:38,308 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:28:38,373 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:28:38,374 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 450 treesize of output 426 [2021-11-25 20:28:38,377 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 418 treesize of output 382 [2021-11-25 20:28:40,472 INFO L354 Elim1Store]: treesize reduction 9, result has 35.7 percent of original size [2021-11-25 20:28:40,472 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 70 treesize of output 61 [2021-11-25 20:28:40,522 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:28:40,522 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 906 treesize of output 854 [2021-11-25 20:28:42,250 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 20:28:42,251 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1172968752] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:28:42,251 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1091435251] [2021-11-25 20:28:42,253 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 20:28:42,253 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:28:42,253 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:28:42,253 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:28:42,254 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:28:42,386 INFO L354 Elim1Store]: treesize reduction 136, result has 24.9 percent of original size [2021-11-25 20:28:42,387 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 8 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 12 case distinctions, treesize of input 44 treesize of output 77 [2021-11-25 20:28:42,403 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 12 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 39 [2021-11-25 20:28:42,444 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 9 select indices, 9 select index equivalence classes, 26 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 0 case distinctions, treesize of input 75 treesize of output 98 [2021-11-25 20:28:42,542 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:42,543 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:42,545 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:42,546 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:42,547 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:42,548 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:28:42,595 INFO L354 Elim1Store]: treesize reduction 138, result has 20.2 percent of original size [2021-11-25 20:28:42,596 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 26 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 13 case distinctions, treesize of input 418 treesize of output 410 [2021-11-25 20:28:42,735 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 20:28:42,752 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:42,756 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:28:42,757 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:42,758 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:42,758 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:28:42,773 INFO L354 Elim1Store]: treesize reduction 44, result has 38.0 percent of original size [2021-11-25 20:28:42,774 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 46 treesize of output 53 [2021-11-25 20:28:42,803 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:42,808 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:42,809 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:42,810 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:28:42,811 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:42,812 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:42,813 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:28:42,814 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:42,815 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:42,816 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:42,818 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:42,819 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:42,820 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:42,820 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:28:42,821 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:42,822 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:42,823 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:28:42,844 INFO L354 Elim1Store]: treesize reduction 60, result has 31.0 percent of original size [2021-11-25 20:28:42,844 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 6 select indices, 6 select index equivalence classes, 7 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 17 case distinctions, treesize of input 532 treesize of output 550 [2021-11-25 20:28:42,883 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:42,886 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:28:42,887 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:42,887 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:42,888 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:28:42,904 INFO L354 Elim1Store]: treesize reduction 44, result has 38.0 percent of original size [2021-11-25 20:28:42,904 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 46 treesize of output 53 [2021-11-25 20:28:43,043 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:28:43,531 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1409#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (= |ULTIMATE.start_main_~acopy~0#1.offset| 0) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0))' at error location [2021-11-25 20:28:43,531 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:28:43,531 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:28:43,532 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 17 [2021-11-25 20:28:43,532 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1343811601] [2021-11-25 20:28:43,532 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:28:43,532 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-25 20:28:43,533 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:28:43,533 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-25 20:28:43,533 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=497, Unknown=0, NotChecked=0, Total=600 [2021-11-25 20:28:43,534 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand has 17 states, 17 states have (on average 1.8235294117647058) internal successors, (31), 17 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:28:43,742 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:28:43,742 INFO L93 Difference]: Finished difference Result 25 states and 27 transitions. [2021-11-25 20:28:43,742 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-25 20:28:43,743 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.8235294117647058) internal successors, (31), 17 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2021-11-25 20:28:43,743 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:28:43,743 INFO L225 Difference]: With dead ends: 25 [2021-11-25 20:28:43,743 INFO L226 Difference]: Without dead ends: 23 [2021-11-25 20:28:43,744 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 31 SyntacticMatches, 4 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 260 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=163, Invalid=707, Unknown=0, NotChecked=0, Total=870 [2021-11-25 20:28:43,745 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 26 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 120 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 148 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 120 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:28:43,745 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 24 Invalid, 148 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 120 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:28:43,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-11-25 20:28:43,750 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2021-11-25 20:28:43,751 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 20 states have (on average 1.15) internal successors, (23), 20 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:28:43,751 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2021-11-25 20:28:43,751 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 17 [2021-11-25 20:28:43,751 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:28:43,752 INFO L470 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2021-11-25 20:28:43,752 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 1.8235294117647058) internal successors, (31), 17 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:28:43,752 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2021-11-25 20:28:43,753 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-25 20:28:43,753 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:28:43,753 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:28:43,775 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2021-11-25 20:28:43,954 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:28:43,955 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:28:43,955 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:28:43,955 INFO L85 PathProgramCache]: Analyzing trace with hash 1746591895, now seen corresponding path program 6 times [2021-11-25 20:28:43,955 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:28:43,955 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1674676753] [2021-11-25 20:28:43,956 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:28:43,956 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:28:44,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:28:44,875 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:28:44,875 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:28:44,875 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1674676753] [2021-11-25 20:28:44,875 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1674676753] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:28:44,875 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1224169170] [2021-11-25 20:28:44,875 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:28:44,876 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:28:44,876 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:28:44,876 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:28:44,878 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-25 20:28:44,937 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:28:44,938 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:28:44,939 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 33 conjunts are in the unsatisfiable core [2021-11-25 20:28:44,941 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:28:44,947 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 20:28:45,085 INFO L354 Elim1Store]: treesize reduction 36, result has 25.0 percent of original size [2021-11-25 20:28:45,086 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 1 case distinctions, treesize of input 30 treesize of output 34 [2021-11-25 20:28:45,466 INFO L354 Elim1Store]: treesize reduction 30, result has 18.9 percent of original size [2021-11-25 20:28:45,467 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 68 treesize of output 26 [2021-11-25 20:28:45,491 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 20:28:45,491 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:28:45,703 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:28:45,703 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 272 treesize of output 260 [2021-11-25 20:28:46,251 INFO L354 Elim1Store]: treesize reduction 17, result has 5.6 percent of original size [2021-11-25 20:28:46,252 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 497 treesize of output 401 [2021-11-25 20:28:46,667 INFO L354 Elim1Store]: treesize reduction 9, result has 50.0 percent of original size [2021-11-25 20:28:46,668 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 39 treesize of output 35 [2021-11-25 20:28:46,694 INFO L354 Elim1Store]: treesize reduction 14, result has 6.7 percent of original size [2021-11-25 20:28:46,694 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 89 treesize of output 78 [2021-11-25 20:28:46,979 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 20:28:46,979 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1224169170] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:28:46,979 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1004783258] [2021-11-25 20:28:46,981 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 20:28:46,982 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:28:46,982 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:28:46,982 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:28:46,982 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:28:47,097 INFO L354 Elim1Store]: treesize reduction 136, result has 24.9 percent of original size [2021-11-25 20:28:47,098 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 8 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 12 case distinctions, treesize of input 44 treesize of output 77 [2021-11-25 20:28:47,115 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 12 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 39 [2021-11-25 20:28:47,151 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 9 select indices, 9 select index equivalence classes, 26 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 0 case distinctions, treesize of input 80 treesize of output 103 [2021-11-25 20:28:47,244 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:47,245 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:47,247 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:47,248 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:47,249 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:47,250 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:47,252 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:47,253 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:47,254 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:47,255 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:47,256 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:47,296 INFO L354 Elim1Store]: treesize reduction 153, result has 12.6 percent of original size [2021-11-25 20:28:47,297 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 32 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 12 case distinctions, treesize of input 428 treesize of output 409 [2021-11-25 20:28:47,365 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:28:47,383 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:47,387 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:47,387 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:28:47,401 INFO L354 Elim1Store]: treesize reduction 37, result has 35.1 percent of original size [2021-11-25 20:28:47,401 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 3 case distinctions, treesize of input 32 treesize of output 39 [2021-11-25 20:28:47,432 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:47,436 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:28:47,437 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:47,438 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:47,440 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:47,441 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:28:47,442 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:47,445 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:47,447 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:47,448 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:28:47,450 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:47,451 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:47,452 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:28:47,563 INFO L354 Elim1Store]: treesize reduction 254, result has 28.9 percent of original size [2021-11-25 20:28:47,563 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 6 select indices, 6 select index equivalence classes, 5 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 21 case distinctions, treesize of input 550 treesize of output 606 [2021-11-25 20:28:47,668 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:47,671 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:28:47,672 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:47,673 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:47,674 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:28:47,688 INFO L354 Elim1Store]: treesize reduction 44, result has 38.0 percent of original size [2021-11-25 20:28:47,688 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 46 treesize of output 53 [2021-11-25 20:28:47,807 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:28:48,490 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1640#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (= |ULTIMATE.start_main_~acopy~0#1.offset| 0) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0))' at error location [2021-11-25 20:28:48,490 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:28:48,491 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:28:48,491 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 10, 10] total 30 [2021-11-25 20:28:48,491 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1241602235] [2021-11-25 20:28:48,491 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:28:48,491 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2021-11-25 20:28:48,492 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:28:48,492 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-11-25 20:28:48,493 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=1276, Unknown=0, NotChecked=0, Total=1406 [2021-11-25 20:28:48,493 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand has 30 states, 30 states have (on average 1.6333333333333333) internal successors, (49), 30 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:28:50,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:28:50,619 INFO L93 Difference]: Finished difference Result 67 states and 75 transitions. [2021-11-25 20:28:50,619 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-11-25 20:28:50,619 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 1.6333333333333333) internal successors, (49), 30 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-11-25 20:28:50,620 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:28:50,620 INFO L225 Difference]: With dead ends: 67 [2021-11-25 20:28:50,620 INFO L226 Difference]: Without dead ends: 56 [2021-11-25 20:28:50,622 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 37 SyntacticMatches, 2 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 630 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=505, Invalid=3155, Unknown=0, NotChecked=0, Total=3660 [2021-11-25 20:28:50,623 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 83 mSDsluCounter, 114 mSDsCounter, 0 mSdLazyCounter, 294 mSolverCounterSat, 106 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 83 SdHoareTripleChecker+Valid, 117 SdHoareTripleChecker+Invalid, 521 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 106 IncrementalHoareTripleChecker+Valid, 294 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 121 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:28:50,623 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [83 Valid, 117 Invalid, 521 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [106 Valid, 294 Invalid, 0 Unknown, 121 Unchecked, 0.2s Time] [2021-11-25 20:28:50,624 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-11-25 20:28:50,632 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 30. [2021-11-25 20:28:50,632 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 29 states have (on average 1.1724137931034482) internal successors, (34), 29 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:28:50,632 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 34 transitions. [2021-11-25 20:28:50,633 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 34 transitions. Word has length 20 [2021-11-25 20:28:50,633 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:28:50,633 INFO L470 AbstractCegarLoop]: Abstraction has 30 states and 34 transitions. [2021-11-25 20:28:50,633 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 1.6333333333333333) internal successors, (49), 30 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:28:50,634 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 34 transitions. [2021-11-25 20:28:50,634 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-25 20:28:50,634 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:28:50,634 INFO L514 BasicCegarLoop]: trace histogram [5, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:28:50,657 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-25 20:28:50,846 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:28:50,847 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:28:50,847 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:28:50,847 INFO L85 PathProgramCache]: Analyzing trace with hash 384249755, now seen corresponding path program 7 times [2021-11-25 20:28:50,847 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:28:50,847 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [583847947] [2021-11-25 20:28:50,847 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:28:50,847 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:28:50,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:28:51,100 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 4 proven. 17 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-25 20:28:51,100 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:28:51,100 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [583847947] [2021-11-25 20:28:51,100 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [583847947] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:28:51,100 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [774345861] [2021-11-25 20:28:51,100 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:28:51,100 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:28:51,100 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:28:51,101 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:28:51,105 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-25 20:28:51,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:28:51,165 INFO L263 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-25 20:28:51,166 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:28:51,340 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 6 proven. 15 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-25 20:28:51,340 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:28:51,672 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 6 proven. 15 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-25 20:28:51,673 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [774345861] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:28:51,673 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1939034830] [2021-11-25 20:28:51,674 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 20:28:51,674 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:28:51,674 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:28:51,675 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:28:51,675 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:28:51,803 INFO L354 Elim1Store]: treesize reduction 136, result has 24.9 percent of original size [2021-11-25 20:28:51,804 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 8 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 12 case distinctions, treesize of input 44 treesize of output 77 [2021-11-25 20:28:51,818 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 12 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 39 [2021-11-25 20:28:51,856 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 9 select indices, 9 select index equivalence classes, 26 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 0 case distinctions, treesize of input 75 treesize of output 98 [2021-11-25 20:28:51,946 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:51,948 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:51,949 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:51,950 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:51,951 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:51,953 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:28:52,003 INFO L354 Elim1Store]: treesize reduction 138, result has 20.2 percent of original size [2021-11-25 20:28:52,004 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 26 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 13 case distinctions, treesize of input 418 treesize of output 410 [2021-11-25 20:28:52,215 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 20:28:52,230 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:52,232 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:28:52,233 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:52,234 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:52,234 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:28:52,247 INFO L354 Elim1Store]: treesize reduction 44, result has 38.0 percent of original size [2021-11-25 20:28:52,248 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 46 treesize of output 53 [2021-11-25 20:28:52,270 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:52,276 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:52,277 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:52,278 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:28:52,279 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:52,279 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:52,280 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:28:52,281 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:52,282 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:52,283 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:52,283 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:52,284 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:52,285 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:52,286 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:28:52,287 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:52,287 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:52,288 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:28:52,310 INFO L354 Elim1Store]: treesize reduction 60, result has 31.0 percent of original size [2021-11-25 20:28:52,310 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 6 select indices, 6 select index equivalence classes, 7 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 17 case distinctions, treesize of input 532 treesize of output 550 [2021-11-25 20:28:52,358 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:52,361 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:28:52,362 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:52,363 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:52,364 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:28:52,381 INFO L354 Elim1Store]: treesize reduction 44, result has 38.0 percent of original size [2021-11-25 20:28:52,382 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 46 treesize of output 53 [2021-11-25 20:28:52,521 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:28:53,056 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1997#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (= |ULTIMATE.start_main_~acopy~0#1.offset| 0) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0))' at error location [2021-11-25 20:28:53,057 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:28:53,057 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:28:53,057 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 32 [2021-11-25 20:28:53,057 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1575623291] [2021-11-25 20:28:53,057 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:28:53,057 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-25 20:28:53,058 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:28:53,058 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-25 20:28:53,059 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=246, Invalid=1314, Unknown=0, NotChecked=0, Total=1560 [2021-11-25 20:28:53,059 INFO L87 Difference]: Start difference. First operand 30 states and 34 transitions. Second operand has 32 states, 32 states have (on average 1.25) internal successors, (40), 32 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:28:53,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:28:53,424 INFO L93 Difference]: Finished difference Result 83 states and 90 transitions. [2021-11-25 20:28:53,424 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-25 20:28:53,424 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.25) internal successors, (40), 32 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-11-25 20:28:53,425 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:28:53,425 INFO L225 Difference]: With dead ends: 83 [2021-11-25 20:28:53,425 INFO L226 Difference]: Without dead ends: 72 [2021-11-25 20:28:53,426 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 795 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=444, Invalid=1812, Unknown=0, NotChecked=0, Total=2256 [2021-11-25 20:28:53,427 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 97 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 181 mSolverCounterSat, 80 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 97 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 261 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 80 IncrementalHoareTripleChecker+Valid, 181 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:28:53,427 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [97 Valid, 70 Invalid, 261 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [80 Valid, 181 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:28:53,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2021-11-25 20:28:53,439 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 31. [2021-11-25 20:28:53,444 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 30 states have (on average 1.2) internal successors, (36), 30 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:28:53,448 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 36 transitions. [2021-11-25 20:28:53,448 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 36 transitions. Word has length 22 [2021-11-25 20:28:53,450 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:28:53,450 INFO L470 AbstractCegarLoop]: Abstraction has 31 states and 36 transitions. [2021-11-25 20:28:53,450 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 1.25) internal successors, (40), 32 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:28:53,451 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 36 transitions. [2021-11-25 20:28:53,451 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-25 20:28:53,452 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:28:53,452 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:28:53,483 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-25 20:28:53,667 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-25 20:28:53,667 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:28:53,667 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:28:53,667 INFO L85 PathProgramCache]: Analyzing trace with hash -804411727, now seen corresponding path program 8 times [2021-11-25 20:28:53,667 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:28:53,668 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [702289510] [2021-11-25 20:28:53,668 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:28:53,668 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:28:53,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:28:54,255 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:28:54,255 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:28:54,256 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [702289510] [2021-11-25 20:28:54,256 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [702289510] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:28:54,256 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1415012440] [2021-11-25 20:28:54,256 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:28:54,256 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:28:54,256 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:28:54,257 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:28:54,258 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-25 20:28:54,343 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-25 20:28:54,343 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:28:54,345 INFO L263 TraceCheckSpWp]: Trace formula consists of 192 conjuncts, 44 conjunts are in the unsatisfiable core [2021-11-25 20:28:54,347 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:28:54,360 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 20:28:54,574 INFO L354 Elim1Store]: treesize reduction 32, result has 27.3 percent of original size [2021-11-25 20:28:54,575 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 1 case distinctions, treesize of input 28 treesize of output 32 [2021-11-25 20:28:54,631 INFO L354 Elim1Store]: treesize reduction 180, result has 14.7 percent of original size [2021-11-25 20:28:54,631 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 64 treesize of output 73 [2021-11-25 20:28:55,269 INFO L354 Elim1Store]: treesize reduction 114, result has 5.8 percent of original size [2021-11-25 20:28:55,269 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 1 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 6 case distinctions, treesize of input 95 treesize of output 29 [2021-11-25 20:28:55,302 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:28:55,302 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:28:55,604 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:28:55,605 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 66366 treesize of output 62374 [2021-11-25 20:28:55,719 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: BigInteger out of long range [2021-11-25 20:28:55,719 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [792071008] [2021-11-25 20:28:55,721 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 20:28:55,721 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:28:55,722 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:28:55,722 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:28:55,722 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:28:55,824 INFO L354 Elim1Store]: treesize reduction 136, result has 24.9 percent of original size [2021-11-25 20:28:55,824 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 8 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 12 case distinctions, treesize of input 44 treesize of output 77 [2021-11-25 20:28:55,834 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 12 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 39 [2021-11-25 20:28:55,861 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 9 select indices, 9 select index equivalence classes, 26 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 0 case distinctions, treesize of input 80 treesize of output 103 [2021-11-25 20:28:55,940 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:55,941 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:55,942 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:55,943 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:55,944 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:55,944 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:55,947 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:55,948 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:55,948 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:55,949 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:55,950 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:55,984 INFO L354 Elim1Store]: treesize reduction 153, result has 12.6 percent of original size [2021-11-25 20:28:55,985 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 32 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 12 case distinctions, treesize of input 428 treesize of output 409 [2021-11-25 20:28:56,061 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 20:28:56,078 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:56,081 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:28:56,082 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:56,083 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:56,084 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:28:56,099 INFO L354 Elim1Store]: treesize reduction 44, result has 38.0 percent of original size [2021-11-25 20:28:56,100 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 46 treesize of output 53 [2021-11-25 20:28:56,131 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:56,135 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:56,136 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:56,137 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:28:56,138 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:56,139 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:56,140 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:28:56,141 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:56,142 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:56,143 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:56,144 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:56,145 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:56,146 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:56,147 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:28:56,148 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:56,149 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:56,149 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:28:56,177 INFO L354 Elim1Store]: treesize reduction 60, result has 31.0 percent of original size [2021-11-25 20:28:56,178 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 6 select indices, 6 select index equivalence classes, 7 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 17 case distinctions, treesize of input 532 treesize of output 550 [2021-11-25 20:28:56,223 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:56,229 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:28:56,230 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:56,231 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:56,232 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:28:56,247 INFO L354 Elim1Store]: treesize reduction 44, result has 38.0 percent of original size [2021-11-25 20:28:56,247 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 46 treesize of output 53 [2021-11-25 20:28:56,387 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:28:57,133 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2335#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (= |ULTIMATE.start_main_~acopy~0#1.offset| 0) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0))' at error location [2021-11-25 20:28:57,134 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:28:57,134 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:28:57,134 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2021-11-25 20:28:57,134 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [338160406] [2021-11-25 20:28:57,134 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-25 20:28:57,134 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-25 20:28:57,134 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:28:57,135 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-25 20:28:57,135 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=176, Invalid=1716, Unknown=0, NotChecked=0, Total=1892 [2021-11-25 20:28:57,135 INFO L87 Difference]: Start difference. First operand 31 states and 36 transitions. Second operand has 16 states, 16 states have (on average 1.4375) internal successors, (23), 16 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:28:57,957 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:28:57,957 INFO L93 Difference]: Finished difference Result 60 states and 65 transitions. [2021-11-25 20:28:57,957 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-25 20:28:57,957 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.4375) internal successors, (23), 16 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2021-11-25 20:28:57,958 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:28:57,958 INFO L225 Difference]: With dead ends: 60 [2021-11-25 20:28:57,958 INFO L226 Difference]: Without dead ends: 58 [2021-11-25 20:28:57,959 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 32 SyntacticMatches, 1 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 830 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=388, Invalid=2804, Unknown=0, NotChecked=0, Total=3192 [2021-11-25 20:28:57,960 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 43 mSDsluCounter, 60 mSDsCounter, 0 mSdLazyCounter, 209 mSolverCounterSat, 57 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 64 SdHoareTripleChecker+Invalid, 266 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 57 IncrementalHoareTripleChecker+Valid, 209 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:28:57,960 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [43 Valid, 64 Invalid, 266 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [57 Valid, 209 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:28:57,961 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2021-11-25 20:28:57,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 38. [2021-11-25 20:28:57,971 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 37 states have (on average 1.162162162162162) internal successors, (43), 37 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:28:57,971 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 43 transitions. [2021-11-25 20:28:57,971 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 43 transitions. Word has length 23 [2021-11-25 20:28:57,971 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:28:57,972 INFO L470 AbstractCegarLoop]: Abstraction has 38 states and 43 transitions. [2021-11-25 20:28:57,972 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 1.4375) internal successors, (23), 16 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:28:57,972 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 43 transitions. [2021-11-25 20:28:57,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-25 20:28:57,973 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:28:57,973 INFO L514 BasicCegarLoop]: trace histogram [6, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:28:57,993 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-25 20:28:58,173 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-25 20:28:58,174 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:28:58,174 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:28:58,174 INFO L85 PathProgramCache]: Analyzing trace with hash 2038743286, now seen corresponding path program 9 times [2021-11-25 20:28:58,174 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:28:58,175 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1399056493] [2021-11-25 20:28:58,175 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:28:58,175 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:28:58,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:28:58,462 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 20:28:58,462 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:28:58,463 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1399056493] [2021-11-25 20:28:58,463 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1399056493] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:28:58,463 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2076950704] [2021-11-25 20:28:58,463 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:28:58,463 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:28:58,463 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:28:58,464 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:28:58,464 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-25 20:28:58,534 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:28:58,534 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:28:58,535 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 27 conjunts are in the unsatisfiable core [2021-11-25 20:28:58,537 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:28:58,633 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:28:58,671 INFO L354 Elim1Store]: treesize reduction 126, result has 31.9 percent of original size [2021-11-25 20:28:58,672 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 62 treesize of output 97 [2021-11-25 20:28:58,685 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-25 20:28:58,708 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 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 15 treesize of output 9 [2021-11-25 20:28:58,718 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:28:58,718 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2021-11-25 20:28:58,839 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-25 20:28:58,839 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:28:58,935 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:28:58,935 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 824 treesize of output 778 [2021-11-25 20:28:58,941 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 242 treesize of output 206 [2021-11-25 20:29:12,801 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 274 treesize of output 266 [2021-11-25 20:29:12,808 INFO L354 Elim1Store]: treesize reduction 9, result has 35.7 percent of original size [2021-11-25 20:29:12,808 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 266 treesize of output 215 [2021-11-25 20:29:12,834 INFO L354 Elim1Store]: treesize reduction 37, result has 9.8 percent of original size [2021-11-25 20:29:12,834 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 1006 treesize of output 914 [2021-11-25 20:29:13,220 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-25 20:29:13,220 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2076950704] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:29:13,220 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1714456386] [2021-11-25 20:29:13,222 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 20:29:13,222 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:29:13,222 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:29:13,222 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:29:13,223 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:29:13,309 INFO L354 Elim1Store]: treesize reduction 97, result has 31.2 percent of original size [2021-11-25 20:29:13,309 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 29 treesize of output 60 [2021-11-25 20:29:13,396 INFO L354 Elim1Store]: treesize reduction 136, result has 24.9 percent of original size [2021-11-25 20:29:13,396 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 8 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 12 case distinctions, treesize of input 44 treesize of output 77 [2021-11-25 20:29:13,412 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 20:29:13,432 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:13,432 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 54 treesize of output 44 [2021-11-25 20:29:13,457 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 20:29:13,477 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:13,480 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:29:13,480 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:13,481 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:13,482 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:29:13,497 INFO L354 Elim1Store]: treesize reduction 44, result has 38.0 percent of original size [2021-11-25 20:29:13,497 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 46 treesize of output 53 [2021-11-25 20:29:13,520 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:13,524 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:13,525 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:13,525 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:29:13,526 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:13,527 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:13,528 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:29:13,528 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:13,529 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:13,530 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:13,531 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:13,532 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:13,533 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:13,533 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:29:13,534 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:13,535 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:13,536 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:29:13,562 INFO L354 Elim1Store]: treesize reduction 60, result has 31.0 percent of original size [2021-11-25 20:29:13,563 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 6 select indices, 6 select index equivalence classes, 7 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 17 case distinctions, treesize of input 502 treesize of output 520 [2021-11-25 20:29:13,594 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:13,596 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:29:13,597 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:13,598 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:13,599 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:29:13,615 INFO L354 Elim1Store]: treesize reduction 44, result has 38.0 percent of original size [2021-11-25 20:29:13,615 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 46 treesize of output 53 [2021-11-25 20:29:13,746 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:29:14,349 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2675#(and (<= 0 |#NULL.base|) (<= 0 |ULTIMATE.start_main_~a~0#1.offset|) (<= 1 ~SIZE~0) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 100000 ~MAX~0) (<= ~SIZE~0 100000) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (<= 0 |ULTIMATE.start_main_~acopy~0#1.offset|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (<= |#NULL.base| 0) (<= |ULTIMATE.start_main_~acopy~0#1.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#NULL.offset|) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (<= |ULTIMATE.start_main_~a~0#1.offset| 0) (<= ~MAX~0 100000))' at error location [2021-11-25 20:29:14,349 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:29:14,349 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:29:14,349 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 26 [2021-11-25 20:29:14,350 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1914752831] [2021-11-25 20:29:14,350 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:29:14,350 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-25 20:29:14,350 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:29:14,350 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-25 20:29:14,351 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=157, Invalid=965, Unknown=0, NotChecked=0, Total=1122 [2021-11-25 20:29:14,351 INFO L87 Difference]: Start difference. First operand 38 states and 43 transitions. Second operand has 26 states, 26 states have (on average 1.8846153846153846) internal successors, (49), 26 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:29:14,809 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:29:14,809 INFO L93 Difference]: Finished difference Result 64 states and 69 transitions. [2021-11-25 20:29:14,809 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-25 20:29:14,810 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.8846153846153846) internal successors, (49), 26 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2021-11-25 20:29:14,810 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:29:14,810 INFO L225 Difference]: With dead ends: 64 [2021-11-25 20:29:14,810 INFO L226 Difference]: Without dead ends: 62 [2021-11-25 20:29:14,811 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 45 SyntacticMatches, 4 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 499 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=325, Invalid=1837, Unknown=0, NotChecked=0, Total=2162 [2021-11-25 20:29:14,812 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 43 mSDsluCounter, 85 mSDsCounter, 0 mSdLazyCounter, 271 mSolverCounterSat, 60 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 89 SdHoareTripleChecker+Invalid, 331 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 60 IncrementalHoareTripleChecker+Valid, 271 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:29:14,812 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [43 Valid, 89 Invalid, 331 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [60 Valid, 271 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:29:14,813 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-11-25 20:29:14,825 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 37. [2021-11-25 20:29:14,825 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 36 states have (on average 1.1388888888888888) internal successors, (41), 36 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:29:14,825 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 41 transitions. [2021-11-25 20:29:14,826 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 41 transitions. Word has length 23 [2021-11-25 20:29:14,826 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:29:14,826 INFO L470 AbstractCegarLoop]: Abstraction has 37 states and 41 transitions. [2021-11-25 20:29:14,826 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 1.8846153846153846) internal successors, (49), 26 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:29:14,826 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 41 transitions. [2021-11-25 20:29:14,827 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-25 20:29:14,827 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:29:14,827 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:29:14,865 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-25 20:29:15,042 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:29:15,043 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:29:15,043 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:29:15,043 INFO L85 PathProgramCache]: Analyzing trace with hash -1054719818, now seen corresponding path program 10 times [2021-11-25 20:29:15,043 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:29:15,043 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1192532852] [2021-11-25 20:29:15,043 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:29:15,043 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:29:15,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:29:15,234 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 6 proven. 12 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-25 20:29:15,235 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:29:15,235 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1192532852] [2021-11-25 20:29:15,235 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1192532852] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:29:15,235 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1092678739] [2021-11-25 20:29:15,235 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:29:15,235 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:29:15,235 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:29:15,236 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:29:15,237 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-25 20:29:15,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:29:15,303 INFO L263 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-25 20:29:15,304 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:29:15,474 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 10 proven. 8 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-25 20:29:15,474 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:29:15,810 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 15 proven. 3 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-25 20:29:15,810 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1092678739] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:29:15,810 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [790385236] [2021-11-25 20:29:15,812 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 20:29:15,812 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:29:15,812 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:29:15,813 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:29:15,813 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:29:15,902 INFO L354 Elim1Store]: treesize reduction 97, result has 31.2 percent of original size [2021-11-25 20:29:15,903 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 29 treesize of output 60 [2021-11-25 20:29:15,989 INFO L354 Elim1Store]: treesize reduction 136, result has 24.9 percent of original size [2021-11-25 20:29:15,989 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 8 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 12 case distinctions, treesize of input 44 treesize of output 77 [2021-11-25 20:29:16,007 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 20:29:16,024 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:16,025 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 54 treesize of output 44 [2021-11-25 20:29:16,043 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 20:29:16,063 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:16,066 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:29:16,067 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:16,068 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:16,068 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:29:16,083 INFO L354 Elim1Store]: treesize reduction 44, result has 38.0 percent of original size [2021-11-25 20:29:16,083 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 46 treesize of output 53 [2021-11-25 20:29:16,105 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:16,108 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:16,109 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:16,110 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:29:16,111 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:16,112 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:16,112 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:29:16,113 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:16,114 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:16,115 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:16,116 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:16,116 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:16,117 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:16,131 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:29:16,132 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:16,133 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:16,134 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:29:16,158 INFO L354 Elim1Store]: treesize reduction 60, result has 31.0 percent of original size [2021-11-25 20:29:16,158 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 6 select indices, 6 select index equivalence classes, 7 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 17 case distinctions, treesize of input 502 treesize of output 520 [2021-11-25 20:29:16,187 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:16,190 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:29:16,191 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:16,192 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:16,192 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:29:16,209 INFO L354 Elim1Store]: treesize reduction 44, result has 38.0 percent of original size [2021-11-25 20:29:16,209 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 46 treesize of output 53 [2021-11-25 20:29:16,324 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:29:16,902 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3028#(and (<= 0 |#NULL.base|) (<= 0 |ULTIMATE.start_main_~a~0#1.offset|) (<= 1 ~SIZE~0) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 100000 ~MAX~0) (<= ~SIZE~0 100000) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (<= 0 |ULTIMATE.start_main_~acopy~0#1.offset|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (<= |#NULL.base| 0) (<= |ULTIMATE.start_main_~acopy~0#1.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#NULL.offset|) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (<= |ULTIMATE.start_main_~a~0#1.offset| 0) (<= ~MAX~0 100000))' at error location [2021-11-25 20:29:16,902 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:29:16,902 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:29:16,902 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 29 [2021-11-25 20:29:16,903 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [174157737] [2021-11-25 20:29:16,903 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:29:16,903 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-25 20:29:16,903 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:29:16,904 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-25 20:29:16,904 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=244, Invalid=1088, Unknown=0, NotChecked=0, Total=1332 [2021-11-25 20:29:16,904 INFO L87 Difference]: Start difference. First operand 37 states and 41 transitions. Second operand has 29 states, 29 states have (on average 1.3448275862068966) internal successors, (39), 29 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:29:17,290 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:29:17,290 INFO L93 Difference]: Finished difference Result 68 states and 74 transitions. [2021-11-25 20:29:17,290 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-25 20:29:17,290 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.3448275862068966) internal successors, (39), 29 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-11-25 20:29:17,290 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:29:17,291 INFO L225 Difference]: With dead ends: 68 [2021-11-25 20:29:17,291 INFO L226 Difference]: Without dead ends: 51 [2021-11-25 20:29:17,292 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 683 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=375, Invalid=1605, Unknown=0, NotChecked=0, Total=1980 [2021-11-25 20:29:17,292 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 71 mSDsluCounter, 95 mSDsCounter, 0 mSdLazyCounter, 389 mSolverCounterSat, 67 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 71 SdHoareTripleChecker+Valid, 106 SdHoareTripleChecker+Invalid, 456 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 67 IncrementalHoareTripleChecker+Valid, 389 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:29:17,292 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [71 Valid, 106 Invalid, 456 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [67 Valid, 389 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 20:29:17,293 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-11-25 20:29:17,301 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 34. [2021-11-25 20:29:17,302 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 33 states have (on average 1.121212121212121) internal successors, (37), 33 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:29:17,302 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 37 transitions. [2021-11-25 20:29:17,302 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 37 transitions. Word has length 24 [2021-11-25 20:29:17,302 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:29:17,302 INFO L470 AbstractCegarLoop]: Abstraction has 34 states and 37 transitions. [2021-11-25 20:29:17,302 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.3448275862068966) internal successors, (39), 29 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:29:17,302 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 37 transitions. [2021-11-25 20:29:17,303 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-25 20:29:17,303 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:29:17,303 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:29:17,323 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-25 20:29:17,506 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-25 20:29:17,507 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:29:17,507 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:29:17,507 INFO L85 PathProgramCache]: Analyzing trace with hash 1692987991, now seen corresponding path program 11 times [2021-11-25 20:29:17,507 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:29:17,507 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1138992840] [2021-11-25 20:29:17,507 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:29:17,507 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:29:17,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:29:17,605 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 16 proven. 20 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 20:29:17,605 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:29:17,605 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1138992840] [2021-11-25 20:29:17,605 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1138992840] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:29:17,606 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1569600608] [2021-11-25 20:29:17,606 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:29:17,606 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:29:17,606 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:29:17,607 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:29:17,617 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-25 20:29:17,757 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-25 20:29:17,757 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:29:17,759 INFO L263 TraceCheckSpWp]: Trace formula consists of 204 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-25 20:29:17,760 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:29:17,887 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 26 proven. 10 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 20:29:17,890 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:29:17,957 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 26 proven. 10 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 20:29:17,957 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1569600608] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:29:17,957 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [781028844] [2021-11-25 20:29:17,958 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 20:29:17,959 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:29:17,959 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:29:17,959 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:29:17,959 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:29:18,051 INFO L354 Elim1Store]: treesize reduction 136, result has 24.9 percent of original size [2021-11-25 20:29:18,051 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 8 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 12 case distinctions, treesize of input 44 treesize of output 77 [2021-11-25 20:29:18,060 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 12 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 39 [2021-11-25 20:29:18,099 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 9 select indices, 9 select index equivalence classes, 26 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 0 case distinctions, treesize of input 80 treesize of output 103 [2021-11-25 20:29:18,177 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:18,179 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:18,180 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:18,181 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:18,182 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:18,183 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:18,186 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:18,187 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:18,188 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:18,189 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:18,190 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:18,233 INFO L354 Elim1Store]: treesize reduction 153, result has 12.6 percent of original size [2021-11-25 20:29:18,233 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 32 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 12 case distinctions, treesize of input 428 treesize of output 409 [2021-11-25 20:29:18,313 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 20:29:18,330 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:18,333 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:18,333 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:29:18,346 INFO L354 Elim1Store]: treesize reduction 37, result has 35.1 percent of original size [2021-11-25 20:29:18,347 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 3 case distinctions, treesize of input 32 treesize of output 39 [2021-11-25 20:29:18,376 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:18,380 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:29:18,381 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:18,382 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:18,384 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:18,385 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:29:18,386 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:18,389 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:18,391 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:18,391 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:29:18,392 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:18,393 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:18,394 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:29:18,507 INFO L354 Elim1Store]: treesize reduction 254, result has 28.9 percent of original size [2021-11-25 20:29:18,508 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 6 select indices, 6 select index equivalence classes, 5 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 21 case distinctions, treesize of input 550 treesize of output 606 [2021-11-25 20:29:18,579 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:18,581 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:29:18,582 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:18,583 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:18,583 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:29:18,597 INFO L354 Elim1Store]: treesize reduction 44, result has 38.0 percent of original size [2021-11-25 20:29:18,598 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 46 treesize of output 53 [2021-11-25 20:29:18,712 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:29:19,281 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3375#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (= |ULTIMATE.start_main_~acopy~0#1.offset| 0) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0))' at error location [2021-11-25 20:29:19,281 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:29:19,281 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:29:19,281 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2021-11-25 20:29:19,281 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1989958400] [2021-11-25 20:29:19,282 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:29:19,282 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-25 20:29:19,282 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:29:19,282 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-25 20:29:19,283 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=621, Unknown=0, NotChecked=0, Total=756 [2021-11-25 20:29:19,283 INFO L87 Difference]: Start difference. First operand 34 states and 37 transitions. Second operand has 20 states, 20 states have (on average 2.25) internal successors, (45), 20 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:29:19,435 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:29:19,436 INFO L93 Difference]: Finished difference Result 62 states and 67 transitions. [2021-11-25 20:29:19,436 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-25 20:29:19,436 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.25) internal successors, (45), 20 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2021-11-25 20:29:19,436 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:29:19,437 INFO L225 Difference]: With dead ends: 62 [2021-11-25 20:29:19,437 INFO L226 Difference]: Without dead ends: 40 [2021-11-25 20:29:19,438 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 310 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=195, Invalid=861, Unknown=0, NotChecked=0, Total=1056 [2021-11-25 20:29:19,438 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 45 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 136 mSolverCounterSat, 48 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 53 SdHoareTripleChecker+Invalid, 184 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 48 IncrementalHoareTripleChecker+Valid, 136 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:29:19,438 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [45 Valid, 53 Invalid, 184 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [48 Valid, 136 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:29:19,439 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-11-25 20:29:19,447 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 27. [2021-11-25 20:29:19,447 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.1153846153846154) internal successors, (29), 26 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:29:19,447 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 29 transitions. [2021-11-25 20:29:19,447 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 29 transitions. Word has length 26 [2021-11-25 20:29:19,447 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:29:19,448 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 29 transitions. [2021-11-25 20:29:19,448 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 2.25) internal successors, (45), 20 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:29:19,448 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 29 transitions. [2021-11-25 20:29:19,448 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-25 20:29:19,449 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:29:19,449 INFO L514 BasicCegarLoop]: trace histogram [6, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:29:19,469 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-25 20:29:19,654 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-25 20:29:19,654 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:29:19,655 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:29:19,655 INFO L85 PathProgramCache]: Analyzing trace with hash 1073935858, now seen corresponding path program 12 times [2021-11-25 20:29:19,655 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:29:19,655 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [860879136] [2021-11-25 20:29:19,655 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:29:19,655 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:29:19,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:29:20,635 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:29:20,636 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:29:20,636 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [860879136] [2021-11-25 20:29:20,636 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [860879136] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:29:20,636 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [927387218] [2021-11-25 20:29:20,636 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:29:20,636 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:29:20,636 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:29:20,663 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:29:20,664 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-25 20:29:20,748 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:29:20,748 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:29:20,749 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 39 conjunts are in the unsatisfiable core [2021-11-25 20:29:20,751 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:29:20,758 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 20:29:20,929 INFO L354 Elim1Store]: treesize reduction 36, result has 25.0 percent of original size [2021-11-25 20:29:20,930 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 1 case distinctions, treesize of input 30 treesize of output 34 [2021-11-25 20:29:21,244 INFO L354 Elim1Store]: treesize reduction 24, result has 22.6 percent of original size [2021-11-25 20:29:21,245 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 62 treesize of output 26 [2021-11-25 20:29:21,270 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-25 20:29:21,270 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:29:21,513 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:29:21,513 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 272 treesize of output 260 [2021-11-25 20:29:22,369 INFO L354 Elim1Store]: treesize reduction 10, result has 33.3 percent of original size [2021-11-25 20:29:22,370 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 195 treesize of output 164 [2021-11-25 20:29:22,515 INFO L354 Elim1Store]: treesize reduction 17, result has 5.6 percent of original size [2021-11-25 20:29:22,516 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 85 treesize of output 51 [2021-11-25 20:29:22,523 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 86 treesize of output 82 [2021-11-25 20:29:22,601 INFO L354 Elim1Store]: treesize reduction 28, result has 42.9 percent of original size [2021-11-25 20:29:22,601 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 539 treesize of output 431 [2021-11-25 20:29:22,893 INFO L354 Elim1Store]: treesize reduction 14, result has 6.7 percent of original size [2021-11-25 20:29:22,893 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 89 treesize of output 78 [2021-11-25 20:29:22,915 INFO L354 Elim1Store]: treesize reduction 17, result has 5.6 percent of original size [2021-11-25 20:29:22,915 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 39 treesize of output 1 [2021-11-25 20:29:23,461 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-25 20:29:23,461 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [927387218] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:29:23,462 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1520258865] [2021-11-25 20:29:23,463 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 20:29:23,463 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:29:23,463 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:29:23,463 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:29:23,464 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:29:23,610 INFO L354 Elim1Store]: treesize reduction 136, result has 24.9 percent of original size [2021-11-25 20:29:23,611 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 8 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 12 case distinctions, treesize of input 44 treesize of output 77 [2021-11-25 20:29:23,628 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 12 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 39 [2021-11-25 20:29:23,680 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 9 select indices, 9 select index equivalence classes, 26 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 0 case distinctions, treesize of input 80 treesize of output 103 [2021-11-25 20:29:23,771 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:23,772 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:23,773 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:23,774 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:23,775 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:23,776 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:23,779 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:23,780 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:23,781 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:23,782 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:23,783 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:23,825 INFO L354 Elim1Store]: treesize reduction 153, result has 12.6 percent of original size [2021-11-25 20:29:23,826 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 32 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 12 case distinctions, treesize of input 428 treesize of output 409 [2021-11-25 20:29:23,881 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 20:29:23,895 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:23,897 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:29:23,898 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:23,899 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:23,900 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:29:23,913 INFO L354 Elim1Store]: treesize reduction 44, result has 38.0 percent of original size [2021-11-25 20:29:23,913 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 46 treesize of output 53 [2021-11-25 20:29:23,938 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:23,941 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:23,942 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:23,943 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:29:23,944 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:23,945 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:23,945 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:29:23,946 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:23,947 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:23,948 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:23,949 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:23,949 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:23,950 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:23,951 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:29:23,952 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:23,953 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:23,953 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:29:23,975 INFO L354 Elim1Store]: treesize reduction 60, result has 31.0 percent of original size [2021-11-25 20:29:23,975 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 6 select indices, 6 select index equivalence classes, 7 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 17 case distinctions, treesize of input 532 treesize of output 550 [2021-11-25 20:29:24,006 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:24,008 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:29:24,009 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:24,010 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:29:24,010 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:29:24,024 INFO L354 Elim1Store]: treesize reduction 44, result has 38.0 percent of original size [2021-11-25 20:29:24,024 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 46 treesize of output 53 [2021-11-25 20:29:24,135 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:29:24,861 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3713#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (= |ULTIMATE.start_main_~acopy~0#1.offset| 0) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0))' at error location [2021-11-25 20:29:24,861 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:29:24,861 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:29:24,861 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 12, 12] total 38 [2021-11-25 20:29:24,861 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1565642638] [2021-11-25 20:29:24,861 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:29:24,862 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-11-25 20:29:24,862 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:29:24,862 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-11-25 20:29:24,863 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=183, Invalid=1887, Unknown=0, NotChecked=0, Total=2070 [2021-11-25 20:29:24,863 INFO L87 Difference]: Start difference. First operand 27 states and 29 transitions. Second operand has 38 states, 38 states have (on average 1.6578947368421053) internal successors, (63), 38 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:29:28,236 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:29:28,236 INFO L93 Difference]: Finished difference Result 108 states and 118 transitions. [2021-11-25 20:29:28,236 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-11-25 20:29:28,237 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.6578947368421053) internal successors, (63), 38 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2021-11-25 20:29:28,237 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:29:28,238 INFO L225 Difference]: With dead ends: 108 [2021-11-25 20:29:28,238 INFO L226 Difference]: Without dead ends: 94 [2021-11-25 20:29:28,241 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 52 SyntacticMatches, 1 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1647 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=825, Invalid=6831, Unknown=0, NotChecked=0, Total=7656 [2021-11-25 20:29:28,241 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 162 mSDsluCounter, 251 mSDsCounter, 0 mSdLazyCounter, 675 mSolverCounterSat, 205 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 162 SdHoareTripleChecker+Valid, 259 SdHoareTripleChecker+Invalid, 1089 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 205 IncrementalHoareTripleChecker+Valid, 675 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 209 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-25 20:29:28,241 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [162 Valid, 259 Invalid, 1089 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [205 Valid, 675 Invalid, 0 Unknown, 209 Unchecked, 0.6s Time] [2021-11-25 20:29:28,242 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2021-11-25 20:29:28,255 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 38. [2021-11-25 20:29:28,255 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 37 states have (on average 1.162162162162162) internal successors, (43), 37 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:29:28,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 43 transitions. [2021-11-25 20:29:28,255 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 43 transitions. Word has length 26 [2021-11-25 20:29:28,256 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:29:28,256 INFO L470 AbstractCegarLoop]: Abstraction has 38 states and 43 transitions. [2021-11-25 20:29:28,256 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 1.6578947368421053) internal successors, (63), 38 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:29:28,256 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 43 transitions. [2021-11-25 20:29:28,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-25 20:29:28,257 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:29:28,257 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:29:28,295 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-25 20:29:28,478 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:29:28,479 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:29:28,479 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:29:28,479 INFO L85 PathProgramCache]: Analyzing trace with hash 416993142, now seen corresponding path program 13 times [2021-11-25 20:29:28,479 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:29:28,479 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [39767966] [2021-11-25 20:29:28,479 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:29:28,479 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:29:28,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:29:29,642 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 53 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:29:29,642 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:29:29,642 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [39767966] [2021-11-25 20:29:29,642 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [39767966] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:29:29,642 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1443623560] [2021-11-25 20:29:29,642 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:29:29,642 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:29:29,642 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:29:29,643 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:29:29,644 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b8c0a8b-5e25-429d-aafa-e9051b16b605/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-25 20:29:29,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:29:29,733 INFO L263 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 50 conjunts are in the unsatisfiable core [2021-11-25 20:29:29,735 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:29:29,743 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 20:29:30,065 INFO L354 Elim1Store]: treesize reduction 48, result has 22.6 percent of original size [2021-11-25 20:29:30,065 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 1 case distinctions, treesize of input 37 treesize of output 41 [2021-11-25 20:29:30,136 INFO L354 Elim1Store]: treesize reduction 120, result has 17.2 percent of original size [2021-11-25 20:29:30,137 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 2 case distinctions, treesize of input 43 treesize of output 49 [2021-11-25 20:29:30,613 INFO L354 Elim1Store]: treesize reduction 24, result has 22.6 percent of original size [2021-11-25 20:29:30,614 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 62 treesize of output 26 [2021-11-25 20:29:30,646 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 53 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:29:30,646 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:29:31,045 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:29:31,046 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 2950 treesize of output 2822