./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-lopstr16/flag_loopdep_simple.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version aef121e0 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-lopstr16/flag_loopdep_simple.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V --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 2e1c46549da470f14361a9b2a5fb79d079bbffb4006138f4fef05b9b152f9be7 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 02:33:08,085 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 02:33:08,087 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 02:33:08,141 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 02:33:08,144 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 02:33:08,149 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 02:33:08,152 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 02:33:08,157 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 02:33:08,160 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 02:33:08,168 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 02:33:08,169 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 02:33:08,171 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 02:33:08,172 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 02:33:08,175 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 02:33:08,178 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 02:33:08,181 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 02:33:08,185 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 02:33:08,188 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 02:33:08,193 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 02:33:08,196 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 02:33:08,199 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 02:33:08,204 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 02:33:08,205 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 02:33:08,208 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 02:33:08,215 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 02:33:08,215 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 02:33:08,216 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 02:33:08,218 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 02:33:08,219 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 02:33:08,220 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 02:33:08,221 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 02:33:08,222 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 02:33:08,224 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 02:33:08,226 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 02:33:08,227 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 02:33:08,228 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 02:33:08,228 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 02:33:08,229 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 02:33:08,229 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 02:33:08,230 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 02:33:08,231 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 02:33:08,232 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 02:33:08,267 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 02:33:08,267 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 02:33:08,268 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 02:33:08,268 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 02:33:08,269 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 02:33:08,269 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 02:33:08,269 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 02:33:08,270 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 02:33:08,270 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 02:33:08,270 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 02:33:08,270 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 02:33:08,270 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 02:33:08,271 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 02:33:08,271 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 02:33:08,271 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 02:33:08,271 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 02:33:08,272 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 02:33:08,272 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 02:33:08,273 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 02:33:08,273 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 02:33:08,273 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 02:33:08,273 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 02:33:08,274 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 02:33:08,274 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 02:33:08,274 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 02:33:08,274 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 02:33:08,274 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 02:33:08,275 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 02:33:08,275 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 02:33:08,275 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 02:33:08,275 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 02:33:08,276 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 02:33:08,276 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:33:08,276 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 02:33:08,276 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 02:33:08,277 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 02:33:08,277 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 02:33:08,277 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 02:33:08,277 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 02:33:08,277 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 02:33:08,278 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 02:33:08,278 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_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 2e1c46549da470f14361a9b2a5fb79d079bbffb4006138f4fef05b9b152f9be7 [2021-11-23 02:33:08,529 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 02:33:08,552 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 02:33:08,555 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 02:33:08,556 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 02:33:08,557 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 02:33:08,558 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/array-lopstr16/flag_loopdep_simple.i [2021-11-23 02:33:08,636 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/data/ede65cde7/c78065b38a6d4e64aa3aeacb0549f4ad/FLAG74a7665dd [2021-11-23 02:33:09,119 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 02:33:09,120 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/sv-benchmarks/c/array-lopstr16/flag_loopdep_simple.i [2021-11-23 02:33:09,127 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/data/ede65cde7/c78065b38a6d4e64aa3aeacb0549f4ad/FLAG74a7665dd [2021-11-23 02:33:09,491 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/data/ede65cde7/c78065b38a6d4e64aa3aeacb0549f4ad [2021-11-23 02:33:09,495 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 02:33:09,496 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 02:33:09,503 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 02:33:09,503 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 02:33:09,508 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 02:33:09,509 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:33:09" (1/1) ... [2021-11-23 02:33:09,513 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7bb8dd11 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:33:09, skipping insertion in model container [2021-11-23 02:33:09,514 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:33:09" (1/1) ... [2021-11-23 02:33:09,521 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 02:33:09,539 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 02:33:09,769 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_31c6b25a-5a0a-4aad-8591-e311d0a9114e/sv-benchmarks/c/array-lopstr16/flag_loopdep_simple.i[812,825] [2021-11-23 02:33:09,790 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:33:09,799 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 02:33:09,812 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_31c6b25a-5a0a-4aad-8591-e311d0a9114e/sv-benchmarks/c/array-lopstr16/flag_loopdep_simple.i[812,825] [2021-11-23 02:33:09,820 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:33:09,835 INFO L208 MainTranslator]: Completed translation [2021-11-23 02:33:09,836 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:33:09 WrapperNode [2021-11-23 02:33:09,836 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 02:33:09,837 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 02:33:09,838 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 02:33:09,838 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 02:33:09,847 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:33:09" (1/1) ... [2021-11-23 02:33:09,855 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:33:09" (1/1) ... [2021-11-23 02:33:09,877 INFO L137 Inliner]: procedures = 17, calls = 14, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 64 [2021-11-23 02:33:09,878 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 02:33:09,879 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 02:33:09,879 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 02:33:09,880 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 02:33:09,889 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:33:09" (1/1) ... [2021-11-23 02:33:09,889 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:33:09" (1/1) ... [2021-11-23 02:33:09,892 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:33:09" (1/1) ... [2021-11-23 02:33:09,892 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:33:09" (1/1) ... [2021-11-23 02:33:09,898 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:33:09" (1/1) ... [2021-11-23 02:33:09,903 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:33:09" (1/1) ... [2021-11-23 02:33:09,905 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:33:09" (1/1) ... [2021-11-23 02:33:09,907 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 02:33:09,908 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 02:33:09,908 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 02:33:09,909 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 02:33:09,910 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:33:09" (1/1) ... [2021-11-23 02:33:09,918 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:33:09,931 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:33:09,943 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 02:33:09,948 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 02:33:09,987 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 02:33:09,988 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 02:33:09,988 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-23 02:33:09,988 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-23 02:33:09,988 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 02:33:09,989 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 02:33:09,989 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-23 02:33:09,989 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-23 02:33:10,070 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 02:33:10,072 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 02:33:10,240 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 02:33:10,271 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 02:33:10,272 INFO L301 CfgBuilder]: Removed 3 assume(true) statements. [2021-11-23 02:33:10,274 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:33:10 BoogieIcfgContainer [2021-11-23 02:33:10,274 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 02:33:10,276 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 02:33:10,276 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 02:33:10,280 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 02:33:10,280 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 02:33:09" (1/3) ... [2021-11-23 02:33:10,281 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4676dac9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:33:10, skipping insertion in model container [2021-11-23 02:33:10,281 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:33:09" (2/3) ... [2021-11-23 02:33:10,282 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4676dac9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:33:10, skipping insertion in model container [2021-11-23 02:33:10,282 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:33:10" (3/3) ... [2021-11-23 02:33:10,283 INFO L111 eAbstractionObserver]: Analyzing ICFG flag_loopdep_simple.i [2021-11-23 02:33:10,289 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 02:33:10,289 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 02:33:10,340 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 02:33:10,348 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 [2021-11-23 02:33:10,348 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 02:33:10,386 INFO L276 IsEmpty]: Start isEmpty. Operand has 11 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 10 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:33:10,392 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-23 02:33:10,396 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:33:10,397 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:33:10,401 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:33:10,407 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:33:10,407 INFO L85 PathProgramCache]: Analyzing trace with hash 721191376, now seen corresponding path program 1 times [2021-11-23 02:33:10,433 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:33:10,434 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [381181543] [2021-11-23 02:33:10,434 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:33:10,435 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:33:10,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:33:10,646 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:33:10,647 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:33:10,647 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [381181543] [2021-11-23 02:33:10,648 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [381181543] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:33:10,648 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:33:10,649 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:33:10,651 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [60267072] [2021-11-23 02:33:10,652 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:33:10,656 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:33:10,657 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:33:10,684 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:33:10,685 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:33:10,687 INFO L87 Difference]: Start difference. First operand has 11 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 10 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:33:10,734 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:33:10,735 INFO L93 Difference]: Finished difference Result 27 states and 37 transitions. [2021-11-23 02:33:10,737 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:33:10,738 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2021-11-23 02:33:10,738 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:33:10,744 INFO L225 Difference]: With dead ends: 27 [2021-11-23 02:33:10,745 INFO L226 Difference]: Without dead ends: 18 [2021-11-23 02:33:10,747 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 [2021-11-23 02:33:10,752 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 7 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 18 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:33:10,754 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 10 Invalid, 18 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:33:10,772 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-11-23 02:33:10,784 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 11. [2021-11-23 02:33:10,785 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11 states, 10 states have (on average 1.4) internal successors, (14), 10 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) [2021-11-23 02:33:10,786 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 14 transitions. [2021-11-23 02:33:10,787 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 14 transitions. Word has length 7 [2021-11-23 02:33:10,787 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:33:10,788 INFO L470 AbstractCegarLoop]: Abstraction has 11 states and 14 transitions. [2021-11-23 02:33:10,788 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:33:10,788 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 14 transitions. [2021-11-23 02:33:10,789 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-23 02:33:10,789 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:33:10,789 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:33:10,789 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-23 02:33:10,790 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:33:10,791 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:33:10,791 INFO L85 PathProgramCache]: Analyzing trace with hash 801657582, now seen corresponding path program 1 times [2021-11-23 02:33:10,791 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:33:10,791 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1234801576] [2021-11-23 02:33:10,792 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:33:10,792 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:33:10,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:33:10,843 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:33:10,843 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:33:10,844 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1234801576] [2021-11-23 02:33:10,844 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1234801576] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:33:10,844 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1525628641] [2021-11-23 02:33:10,845 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:33:10,845 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:33:10,845 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:33:10,849 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:33:10,884 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-23 02:33:10,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:33:10,916 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 02:33:10,920 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:33:10,991 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 02:33:10,992 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:33:10,992 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1525628641] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:33:10,992 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:33:10,993 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [4] total 5 [2021-11-23 02:33:10,994 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1979184000] [2021-11-23 02:33:10,994 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:33:10,995 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:33:10,995 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:33:10,996 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:33:10,996 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:33:10,996 INFO L87 Difference]: Start difference. First operand 11 states and 14 transitions. Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 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) [2021-11-23 02:33:11,011 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:33:11,011 INFO L93 Difference]: Finished difference Result 21 states and 27 transitions. [2021-11-23 02:33:11,012 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:33:11,012 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 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 [2021-11-23 02:33:11,012 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:33:11,013 INFO L225 Difference]: With dead ends: 21 [2021-11-23 02:33:11,013 INFO L226 Difference]: Without dead ends: 12 [2021-11-23 02:33:11,014 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:33:11,015 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 0 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 9 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:33:11,016 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 16 Invalid, 9 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:33:11,018 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2021-11-23 02:33:11,020 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2021-11-23 02:33:11,020 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 11 states have (on average 1.3636363636363635) internal successors, (15), 11 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) [2021-11-23 02:33:11,021 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 15 transitions. [2021-11-23 02:33:11,021 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 15 transitions. Word has length 8 [2021-11-23 02:33:11,021 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:33:11,022 INFO L470 AbstractCegarLoop]: Abstraction has 12 states and 15 transitions. [2021-11-23 02:33:11,022 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 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) [2021-11-23 02:33:11,022 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 15 transitions. [2021-11-23 02:33:11,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-23 02:33:11,023 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:33:11,023 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:33:11,057 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-23 02:33:11,238 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:33:11,238 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:33:11,239 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:33:11,239 INFO L85 PathProgramCache]: Analyzing trace with hash -299864784, now seen corresponding path program 1 times [2021-11-23 02:33:11,239 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:33:11,240 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [241589600] [2021-11-23 02:33:11,240 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:33:11,240 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:33:11,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:33:11,288 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 02:33:11,288 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:33:11,288 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [241589600] [2021-11-23 02:33:11,289 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [241589600] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:33:11,289 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1998551864] [2021-11-23 02:33:11,289 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:33:11,289 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:33:11,290 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:33:11,291 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:33:11,307 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-23 02:33:11,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:33:11,337 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 02:33:11,338 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:33:11,410 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 02:33:11,410 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:33:11,483 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 02:33:11,484 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1998551864] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:33:11,484 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1722836666] [2021-11-23 02:33:11,503 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-23 02:33:11,504 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:33:11,509 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:33:11,514 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:33:11,515 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:33:11,590 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:33:11,617 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-23 02:33:11,618 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-23 02:33:11,635 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:33:11,637 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2021-11-23 02:33:11,684 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:33:11,686 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 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-23 02:33:11,832 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:33:11,833 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:33:11,865 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-23 02:33:11,866 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 238 treesize of output 237 [2021-11-23 02:33:12,123 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 25 treesize of output 21 [2021-11-23 02:33:12,348 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:33:12,621 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '193#(and (<= |ULTIMATE.start_init_~size#1| 1000000) (<= |ULTIMATE.start_init_~a#1.offset| 0) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (= |ULTIMATE.start_main_~i~1#1| 0) (= |ULTIMATE.start_main_#t~mem6#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~1#1| 4)))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_init_#in~a#1.offset|) (= (ite (= |ULTIMATE.start_main_#t~mem6#1| 0) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1000000 |ULTIMATE.start_init_~size#1|) (<= 0 |ULTIMATE.start_init_#in~a#1.base|) (= |ULTIMATE.start_main_~flag~0#1| 0) (= 1000000 |ULTIMATE.start_init_#in~size#1|) (<= 0 |ULTIMATE.start_init_~a#1.base|) (<= 0 |ULTIMATE.start_init_~a#1.offset|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 1000000 |ULTIMATE.start_init_~i~0#1|) (<= |ULTIMATE.start_init_#in~a#1.offset| 0) (= |#NULL.base| 0))' at error location [2021-11-23 02:33:12,621 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:33:12,621 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:33:12,621 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 3, 3] total 8 [2021-11-23 02:33:12,622 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [211881243] [2021-11-23 02:33:12,622 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:33:12,622 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 02:33:12,623 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:33:12,623 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 02:33:12,624 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2021-11-23 02:33:12,624 INFO L87 Difference]: Start difference. First operand 12 states and 15 transitions. Second operand has 8 states, 8 states have (on average 2.125) internal successors, (17), 8 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) [2021-11-23 02:33:12,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:33:12,674 INFO L93 Difference]: Finished difference Result 39 states and 50 transitions. [2021-11-23 02:33:12,675 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-23 02:33:12,675 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.125) internal successors, (17), 8 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) Word has length 9 [2021-11-23 02:33:12,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:33:12,676 INFO L225 Difference]: With dead ends: 39 [2021-11-23 02:33:12,676 INFO L226 Difference]: Without dead ends: 30 [2021-11-23 02:33:12,677 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2021-11-23 02:33:12,678 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 14 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:33:12,679 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 25 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:33:12,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-11-23 02:33:12,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 16. [2021-11-23 02:33:12,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 15 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) [2021-11-23 02:33:12,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 19 transitions. [2021-11-23 02:33:12,684 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 19 transitions. Word has length 9 [2021-11-23 02:33:12,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:33:12,684 INFO L470 AbstractCegarLoop]: Abstraction has 16 states and 19 transitions. [2021-11-23 02:33:12,684 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.125) internal successors, (17), 8 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) [2021-11-23 02:33:12,685 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 19 transitions. [2021-11-23 02:33:12,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-23 02:33:12,685 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:33:12,685 INFO L514 BasicCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:33:12,723 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-23 02:33:12,910 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:33:12,910 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:33:12,911 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:33:12,911 INFO L85 PathProgramCache]: Analyzing trace with hash 751908112, now seen corresponding path program 2 times [2021-11-23 02:33:12,911 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:33:12,911 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1913220679] [2021-11-23 02:33:12,912 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:33:12,912 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:33:12,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:33:13,023 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 02:33:13,023 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:33:13,023 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1913220679] [2021-11-23 02:33:13,025 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1913220679] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:33:13,025 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [177668527] [2021-11-23 02:33:13,025 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:33:13,025 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:33:13,026 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:33:13,028 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:33:13,050 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-23 02:33:13,094 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-23 02:33:13,094 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:33:13,095 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 02:33:13,096 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:33:13,129 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 02:33:13,130 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:33:13,183 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 02:33:13,184 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [177668527] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:33:13,184 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1523990556] [2021-11-23 02:33:13,193 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-23 02:33:13,193 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:33:13,195 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:33:13,195 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:33:13,195 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:33:13,238 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:33:13,259 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-23 02:33:13,260 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-23 02:33:13,275 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:33:13,277 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2021-11-23 02:33:13,329 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:33:13,331 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 0 case distinctions, treesize of input 39 treesize of output 41 [2021-11-23 02:33:13,464 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:33:13,468 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:33:13,470 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:33:13,486 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-23 02:33:13,487 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 248 treesize of output 236 [2021-11-23 02:33:13,569 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 25 treesize of output 21 [2021-11-23 02:33:13,736 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:33:13,983 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '357#(and (<= |ULTIMATE.start_init_~size#1| 1000000) (<= |ULTIMATE.start_init_~a#1.offset| 0) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (= |ULTIMATE.start_main_~i~1#1| 0) (= |ULTIMATE.start_main_#t~mem6#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~1#1| 4)))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_init_#in~a#1.offset|) (= (ite (= |ULTIMATE.start_main_#t~mem6#1| 0) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1000000 |ULTIMATE.start_init_~size#1|) (<= 0 |ULTIMATE.start_init_#in~a#1.base|) (= |ULTIMATE.start_main_~flag~0#1| 0) (= 1000000 |ULTIMATE.start_init_#in~size#1|) (<= 0 |ULTIMATE.start_init_~a#1.base|) (<= 0 |ULTIMATE.start_init_~a#1.offset|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 1000000 |ULTIMATE.start_init_~i~0#1|) (<= |ULTIMATE.start_init_#in~a#1.offset| 0) (= |#NULL.base| 0))' at error location [2021-11-23 02:33:13,983 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:33:13,983 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:33:13,983 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2021-11-23 02:33:13,983 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1302923137] [2021-11-23 02:33:13,984 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:33:13,984 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-23 02:33:13,984 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:33:13,985 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-23 02:33:13,985 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=107, Unknown=0, NotChecked=0, Total=182 [2021-11-23 02:33:13,985 INFO L87 Difference]: Start difference. First operand 16 states and 19 transitions. Second operand has 9 states, 9 states have (on average 1.7777777777777777) internal successors, (16), 9 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:33:14,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:33:14,059 INFO L93 Difference]: Finished difference Result 63 states and 76 transitions. [2021-11-23 02:33:14,059 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-23 02:33:14,059 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.7777777777777777) internal successors, (16), 9 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2021-11-23 02:33:14,060 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:33:14,060 INFO L225 Difference]: With dead ends: 63 [2021-11-23 02:33:14,061 INFO L226 Difference]: Without dead ends: 56 [2021-11-23 02:33:14,061 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=75, Invalid=107, Unknown=0, NotChecked=0, Total=182 [2021-11-23 02:33:14,063 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 70 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 57 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:33:14,063 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [70 Valid, 35 Invalid, 57 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:33:14,064 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-11-23 02:33:14,068 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 20. [2021-11-23 02:33:14,069 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 19 states have (on average 1.2105263157894737) internal successors, (23), 19 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) [2021-11-23 02:33:14,069 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 23 transitions. [2021-11-23 02:33:14,069 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 23 transitions. Word has length 13 [2021-11-23 02:33:14,070 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:33:14,070 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 23 transitions. [2021-11-23 02:33:14,070 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 1.7777777777777777) internal successors, (16), 9 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:33:14,070 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 23 transitions. [2021-11-23 02:33:14,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-23 02:33:14,071 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:33:14,071 INFO L514 BasicCegarLoop]: trace histogram [6, 4, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:33:14,108 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-23 02:33:14,284 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:33:14,284 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:33:14,285 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:33:14,285 INFO L85 PathProgramCache]: Analyzing trace with hash -1111495536, now seen corresponding path program 3 times [2021-11-23 02:33:14,285 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:33:14,285 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [928187969] [2021-11-23 02:33:14,285 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:33:14,285 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:33:14,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:33:14,422 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 02:33:14,422 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:33:14,422 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [928187969] [2021-11-23 02:33:14,423 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [928187969] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:33:14,423 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [746463491] [2021-11-23 02:33:14,423 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:33:14,423 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:33:14,423 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:33:14,424 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:33:14,442 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-23 02:33:14,482 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:33:14,482 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:33:14,496 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 02:33:14,498 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:33:14,651 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-23 02:33:14,652 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:33:14,778 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-23 02:33:14,778 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [746463491] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:33:14,779 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [152779014] [2021-11-23 02:33:14,784 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-23 02:33:14,784 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:33:14,785 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:33:14,785 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:33:14,785 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:33:14,813 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:33:14,829 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-23 02:33:14,829 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-23 02:33:14,842 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:33:14,844 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2021-11-23 02:33:14,887 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:33:14,890 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 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-23 02:33:14,966 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:33:14,967 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:33:14,995 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-23 02:33:14,996 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 238 treesize of output 237 [2021-11-23 02:33:15,174 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 25 treesize of output 21 [2021-11-23 02:33:15,311 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:33:15,692 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '593#(and (<= |ULTIMATE.start_init_~size#1| 1000000) (<= |ULTIMATE.start_init_~a#1.offset| 0) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (= |ULTIMATE.start_main_~i~1#1| 0) (= |ULTIMATE.start_main_#t~mem6#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~1#1| 4)))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_init_#in~a#1.offset|) (= (ite (= |ULTIMATE.start_main_#t~mem6#1| 0) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1000000 |ULTIMATE.start_init_~size#1|) (<= 0 |ULTIMATE.start_init_#in~a#1.base|) (= |ULTIMATE.start_main_~flag~0#1| 0) (= 1000000 |ULTIMATE.start_init_#in~size#1|) (<= 0 |ULTIMATE.start_init_~a#1.base|) (<= 0 |ULTIMATE.start_init_~a#1.offset|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 1000000 |ULTIMATE.start_init_~i~0#1|) (<= |ULTIMATE.start_init_#in~a#1.offset| 0) (= |#NULL.base| 0))' at error location [2021-11-23 02:33:15,692 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:33:15,692 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:33:15,692 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 6, 6] total 19 [2021-11-23 02:33:15,692 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [292731070] [2021-11-23 02:33:15,693 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:33:15,693 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-23 02:33:15,693 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:33:15,694 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-23 02:33:15,694 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=412, Unknown=0, NotChecked=0, Total=552 [2021-11-23 02:33:15,695 INFO L87 Difference]: Start difference. First operand 20 states and 23 transitions. Second operand has 19 states, 19 states have (on average 1.4736842105263157) internal successors, (28), 19 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) [2021-11-23 02:33:15,809 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:33:15,809 INFO L93 Difference]: Finished difference Result 90 states and 109 transitions. [2021-11-23 02:33:15,809 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-23 02:33:15,810 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.4736842105263157) internal successors, (28), 19 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 17 [2021-11-23 02:33:15,810 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:33:15,811 INFO L225 Difference]: With dead ends: 90 [2021-11-23 02:33:15,811 INFO L226 Difference]: Without dead ends: 76 [2021-11-23 02:33:15,812 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 175 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=140, Invalid=412, Unknown=0, NotChecked=0, Total=552 [2021-11-23 02:33:15,813 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 161 mSDsluCounter, 53 mSDsCounter, 0 mSdLazyCounter, 66 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 161 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 99 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 66 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:33:15,814 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [161 Valid, 55 Invalid, 99 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 66 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:33:15,815 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2021-11-23 02:33:15,819 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 27. [2021-11-23 02:33:15,819 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.1538461538461537) internal successors, (30), 26 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) [2021-11-23 02:33:15,820 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 30 transitions. [2021-11-23 02:33:15,820 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 30 transitions. Word has length 17 [2021-11-23 02:33:15,820 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:33:15,821 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 30 transitions. [2021-11-23 02:33:15,821 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.4736842105263157) internal successors, (28), 19 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) [2021-11-23 02:33:15,821 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 30 transitions. [2021-11-23 02:33:15,822 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-23 02:33:15,822 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:33:15,822 INFO L514 BasicCegarLoop]: trace histogram [10, 7, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:33:15,860 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-23 02:33:16,046 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:33:16,047 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:33:16,047 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:33:16,047 INFO L85 PathProgramCache]: Analyzing trace with hash 1942026478, now seen corresponding path program 4 times [2021-11-23 02:33:16,047 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:33:16,048 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1559159171] [2021-11-23 02:33:16,048 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:33:16,048 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:33:16,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:33:16,163 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-23 02:33:16,163 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:33:16,163 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1559159171] [2021-11-23 02:33:16,163 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1559159171] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:33:16,163 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [17610415] [2021-11-23 02:33:16,164 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:33:16,164 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:33:16,164 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:33:16,165 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:33:16,186 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-23 02:33:16,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:33:16,221 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 02:33:16,223 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:33:16,460 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 02:33:16,460 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:33:16,773 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 02:33:16,773 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [17610415] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:33:16,774 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [613767288] [2021-11-23 02:33:16,776 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-23 02:33:16,776 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:33:16,776 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:33:16,776 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:33:16,776 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:33:16,797 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:33:16,810 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-23 02:33:16,810 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2021-11-23 02:33:16,820 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:33:16,835 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-23 02:33:16,836 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-23 02:33:16,867 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:33:16,868 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 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-23 02:33:16,945 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:33:16,946 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:33:16,973 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-23 02:33:16,973 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 238 treesize of output 237 [2021-11-23 02:33:17,162 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 25 treesize of output 21 [2021-11-23 02:33:17,300 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:33:17,560 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '940#(and (<= |ULTIMATE.start_init_~size#1| 1000000) (<= |ULTIMATE.start_init_~a#1.offset| 0) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (= |ULTIMATE.start_main_~i~1#1| 0) (= |ULTIMATE.start_main_#t~mem6#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~1#1| 4)))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_init_#in~a#1.offset|) (= (ite (= |ULTIMATE.start_main_#t~mem6#1| 0) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1000000 |ULTIMATE.start_init_~size#1|) (<= 0 |ULTIMATE.start_init_#in~a#1.base|) (= |ULTIMATE.start_main_~flag~0#1| 0) (= 1000000 |ULTIMATE.start_init_#in~size#1|) (<= 0 |ULTIMATE.start_init_~a#1.base|) (<= 0 |ULTIMATE.start_init_~a#1.offset|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 1000000 |ULTIMATE.start_init_~i~0#1|) (<= |ULTIMATE.start_init_#in~a#1.offset| 0) (= |#NULL.base| 0))' at error location [2021-11-23 02:33:17,561 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:33:17,561 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:33:17,561 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 12, 12] total 32 [2021-11-23 02:33:17,561 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1062713131] [2021-11-23 02:33:17,561 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:33:17,562 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-23 02:33:17,562 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:33:17,562 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-23 02:33:17,563 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=362, Invalid=970, Unknown=0, NotChecked=0, Total=1332 [2021-11-23 02:33:17,563 INFO L87 Difference]: Start difference. First operand 27 states and 30 transitions. Second operand has 32 states, 32 states have (on average 1.28125) internal successors, (41), 32 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) [2021-11-23 02:33:17,682 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:33:17,682 INFO L93 Difference]: Finished difference Result 111 states and 137 transitions. [2021-11-23 02:33:17,682 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-11-23 02:33:17,683 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.28125) internal successors, (41), 32 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) Word has length 24 [2021-11-23 02:33:17,683 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:33:17,684 INFO L225 Difference]: With dead ends: 111 [2021-11-23 02:33:17,684 INFO L226 Difference]: Without dead ends: 96 [2021-11-23 02:33:17,685 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 367 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=362, Invalid=970, Unknown=0, NotChecked=0, Total=1332 [2021-11-23 02:33:17,686 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 147 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 84 mSolverCounterSat, 40 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 147 SdHoareTripleChecker+Valid, 60 SdHoareTripleChecker+Invalid, 124 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 84 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:33:17,686 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [147 Valid, 60 Invalid, 124 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 84 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:33:17,687 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2021-11-23 02:33:17,692 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 40. [2021-11-23 02:33:17,692 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 39 states have (on average 1.1025641025641026) internal successors, (43), 39 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) [2021-11-23 02:33:17,693 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 43 transitions. [2021-11-23 02:33:17,693 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 43 transitions. Word has length 24 [2021-11-23 02:33:17,693 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:33:17,693 INFO L470 AbstractCegarLoop]: Abstraction has 40 states and 43 transitions. [2021-11-23 02:33:17,693 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 1.28125) internal successors, (41), 32 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) [2021-11-23 02:33:17,693 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 43 transitions. [2021-11-23 02:33:17,694 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-11-23 02:33:17,694 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:33:17,695 INFO L514 BasicCegarLoop]: trace histogram [22, 8, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:33:17,731 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-23 02:33:17,895 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-23 02:33:17,895 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:33:17,896 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:33:17,896 INFO L85 PathProgramCache]: Analyzing trace with hash -1369821680, now seen corresponding path program 5 times [2021-11-23 02:33:17,896 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:33:17,896 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2026009308] [2021-11-23 02:33:17,896 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:33:17,896 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:33:17,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:33:18,049 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2021-11-23 02:33:18,049 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:33:18,049 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2026009308] [2021-11-23 02:33:18,049 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2026009308] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:33:18,049 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1303445110] [2021-11-23 02:33:18,050 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:33:18,050 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:33:18,050 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:33:18,056 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:33:18,073 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-23 02:33:18,126 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-23 02:33:18,126 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:33:18,127 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 02:33:18,130 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:33:18,201 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2021-11-23 02:33:18,202 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:33:18,407 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2021-11-23 02:33:18,407 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1303445110] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:33:18,407 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1894070867] [2021-11-23 02:33:18,410 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-23 02:33:18,410 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:33:18,410 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:33:18,410 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:33:18,411 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:33:18,426 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:33:18,438 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-23 02:33:18,438 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2021-11-23 02:33:18,449 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:33:18,463 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-23 02:33:18,464 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-23 02:33:18,490 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:33:18,491 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 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-23 02:33:18,583 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:33:18,584 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:33:18,605 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-23 02:33:18,606 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 238 treesize of output 237 [2021-11-23 02:33:18,752 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 25 treesize of output 21 [2021-11-23 02:33:18,891 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:33:19,091 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1416#(and (<= |ULTIMATE.start_init_~size#1| 1000000) (<= |ULTIMATE.start_init_~a#1.offset| 0) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (= |ULTIMATE.start_main_~i~1#1| 0) (= |ULTIMATE.start_main_#t~mem6#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~1#1| 4)))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_init_#in~a#1.offset|) (= (ite (= |ULTIMATE.start_main_#t~mem6#1| 0) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1000000 |ULTIMATE.start_init_~size#1|) (<= 0 |ULTIMATE.start_init_#in~a#1.base|) (= |ULTIMATE.start_main_~flag~0#1| 0) (= 1000000 |ULTIMATE.start_init_#in~size#1|) (<= 0 |ULTIMATE.start_init_~a#1.base|) (<= 0 |ULTIMATE.start_init_~a#1.offset|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 1000000 |ULTIMATE.start_init_~i~0#1|) (<= |ULTIMATE.start_init_#in~a#1.offset| 0) (= |#NULL.base| 0))' at error location [2021-11-23 02:33:19,092 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:33:19,092 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:33:19,092 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 21 [2021-11-23 02:33:19,092 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1848864617] [2021-11-23 02:33:19,092 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:33:19,093 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-11-23 02:33:19,093 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:33:19,093 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-11-23 02:33:19,094 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=285, Invalid=365, Unknown=0, NotChecked=0, Total=650 [2021-11-23 02:33:19,094 INFO L87 Difference]: Start difference. First operand 40 states and 43 transitions. Second operand has 21 states, 21 states have (on average 1.3333333333333333) internal successors, (28), 21 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) [2021-11-23 02:33:19,260 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:33:19,260 INFO L93 Difference]: Finished difference Result 177 states and 208 transitions. [2021-11-23 02:33:19,261 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-23 02:33:19,261 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.3333333333333333) internal successors, (28), 21 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 37 [2021-11-23 02:33:19,262 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:33:19,263 INFO L225 Difference]: With dead ends: 177 [2021-11-23 02:33:19,264 INFO L226 Difference]: Without dead ends: 170 [2021-11-23 02:33:19,264 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 96 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 196 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=285, Invalid=365, Unknown=0, NotChecked=0, Total=650 [2021-11-23 02:33:19,265 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 273 mSDsluCounter, 90 mSDsCounter, 0 mSdLazyCounter, 88 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 273 SdHoareTripleChecker+Valid, 90 SdHoareTripleChecker+Invalid, 139 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 88 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:33:19,266 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [273 Valid, 90 Invalid, 139 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 88 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:33:19,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2021-11-23 02:33:19,279 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 50. [2021-11-23 02:33:19,280 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 49 states have (on average 1.0816326530612246) internal successors, (53), 49 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:33:19,281 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 53 transitions. [2021-11-23 02:33:19,281 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 53 transitions. Word has length 37 [2021-11-23 02:33:19,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:33:19,281 INFO L470 AbstractCegarLoop]: Abstraction has 50 states and 53 transitions. [2021-11-23 02:33:19,282 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 1.3333333333333333) internal successors, (28), 21 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) [2021-11-23 02:33:19,282 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 53 transitions. [2021-11-23 02:33:19,283 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-23 02:33:19,283 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:33:19,283 INFO L514 BasicCegarLoop]: trace histogram [22, 18, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:33:19,317 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-23 02:33:19,504 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-11-23 02:33:19,504 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:33:19,505 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:33:19,505 INFO L85 PathProgramCache]: Analyzing trace with hash 190263504, now seen corresponding path program 6 times [2021-11-23 02:33:19,505 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:33:19,505 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [163711926] [2021-11-23 02:33:19,505 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:33:19,505 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:33:19,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:33:19,818 INFO L134 CoverageAnalysis]: Checked inductivity of 424 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2021-11-23 02:33:19,818 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:33:19,819 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [163711926] [2021-11-23 02:33:19,819 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [163711926] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:33:19,819 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [49811656] [2021-11-23 02:33:19,819 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:33:19,819 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:33:19,819 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:33:19,820 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:33:19,824 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-23 02:33:19,890 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:33:19,890 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:33:19,892 INFO L263 TraceCheckSpWp]: Trace formula consists of 267 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-23 02:33:19,896 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:33:20,497 INFO L134 CoverageAnalysis]: Checked inductivity of 424 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2021-11-23 02:33:20,498 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:33:21,404 INFO L134 CoverageAnalysis]: Checked inductivity of 424 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2021-11-23 02:33:21,405 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [49811656] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:33:21,405 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [776542895] [2021-11-23 02:33:21,407 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-23 02:33:21,407 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:33:21,407 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:33:21,408 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:33:21,408 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:33:21,429 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:33:21,439 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-23 02:33:21,440 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2021-11-23 02:33:21,451 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:33:21,463 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-23 02:33:21,464 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-23 02:33:21,496 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:33:21,498 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 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-23 02:33:21,576 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:33:21,577 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:33:21,596 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-23 02:33:21,597 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 238 treesize of output 237 [2021-11-23 02:33:21,753 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 25 treesize of output 21 [2021-11-23 02:33:21,901 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:33:22,238 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2096#(and (<= |ULTIMATE.start_init_~size#1| 1000000) (<= |ULTIMATE.start_init_~a#1.offset| 0) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (= |ULTIMATE.start_main_~i~1#1| 0) (= |ULTIMATE.start_main_#t~mem6#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~1#1| 4)))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_init_#in~a#1.offset|) (= (ite (= |ULTIMATE.start_main_#t~mem6#1| 0) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1000000 |ULTIMATE.start_init_~size#1|) (<= 0 |ULTIMATE.start_init_#in~a#1.base|) (= |ULTIMATE.start_main_~flag~0#1| 0) (= 1000000 |ULTIMATE.start_init_#in~size#1|) (<= 0 |ULTIMATE.start_init_~a#1.base|) (<= 0 |ULTIMATE.start_init_~a#1.offset|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 1000000 |ULTIMATE.start_init_~i~0#1|) (<= |ULTIMATE.start_init_#in~a#1.offset| 0) (= |#NULL.base| 0))' at error location [2021-11-23 02:33:22,238 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:33:22,239 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:33:22,239 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 24, 24] total 67 [2021-11-23 02:33:22,239 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [653113121] [2021-11-23 02:33:22,239 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:33:22,240 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 67 states [2021-11-23 02:33:22,240 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:33:22,241 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2021-11-23 02:33:22,243 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1412, Invalid=3700, Unknown=0, NotChecked=0, Total=5112 [2021-11-23 02:33:22,243 INFO L87 Difference]: Start difference. First operand 50 states and 53 transitions. Second operand has 67 states, 67 states have (on average 1.1343283582089552) internal successors, (76), 67 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:33:22,472 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:33:22,472 INFO L93 Difference]: Finished difference Result 234 states and 283 transitions. [2021-11-23 02:33:22,472 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2021-11-23 02:33:22,473 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 67 states have (on average 1.1343283582089552) internal successors, (76), 67 states have internal predecessors, (76), 0 states have call successors, (0), 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 47 [2021-11-23 02:33:22,473 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:33:22,474 INFO L225 Difference]: With dead ends: 234 [2021-11-23 02:33:22,474 INFO L226 Difference]: Without dead ends: 208 [2021-11-23 02:33:22,477 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 90 SyntacticMatches, 0 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1309 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1412, Invalid=3700, Unknown=0, NotChecked=0, Total=5112 [2021-11-23 02:33:22,478 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 406 mSDsluCounter, 113 mSDsCounter, 0 mSdLazyCounter, 152 mSolverCounterSat, 89 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 406 SdHoareTripleChecker+Valid, 115 SdHoareTripleChecker+Invalid, 241 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 89 IncrementalHoareTripleChecker+Valid, 152 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:33:22,479 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [406 Valid, 115 Invalid, 241 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [89 Valid, 152 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:33:22,480 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2021-11-23 02:33:22,497 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 75. [2021-11-23 02:33:22,497 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 74 states have (on average 1.054054054054054) internal successors, (78), 74 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:33:22,502 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 78 transitions. [2021-11-23 02:33:22,502 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 78 transitions. Word has length 47 [2021-11-23 02:33:22,502 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:33:22,502 INFO L470 AbstractCegarLoop]: Abstraction has 75 states and 78 transitions. [2021-11-23 02:33:22,503 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 67 states, 67 states have (on average 1.1343283582089552) internal successors, (76), 67 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:33:22,503 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 78 transitions. [2021-11-23 02:33:22,508 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-11-23 02:33:22,508 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:33:22,508 INFO L514 BasicCegarLoop]: trace histogram [46, 19, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:33:22,546 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-23 02:33:22,721 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:33:22,722 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:33:22,722 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:33:22,722 INFO L85 PathProgramCache]: Analyzing trace with hash 1442170606, now seen corresponding path program 7 times [2021-11-23 02:33:22,722 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:33:22,722 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [785667602] [2021-11-23 02:33:22,723 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:33:22,723 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:33:22,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:33:23,067 INFO L134 CoverageAnalysis]: Checked inductivity of 1271 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 1081 trivial. 0 not checked. [2021-11-23 02:33:23,068 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:33:23,068 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [785667602] [2021-11-23 02:33:23,068 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [785667602] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:33:23,068 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [703151921] [2021-11-23 02:33:23,068 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:33:23,068 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:33:23,068 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:33:23,070 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:33:23,090 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-23 02:33:23,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:33:23,172 INFO L263 TraceCheckSpWp]: Trace formula consists of 415 conjuncts, 50 conjunts are in the unsatisfiable core [2021-11-23 02:33:23,177 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:33:24,867 INFO L134 CoverageAnalysis]: Checked inductivity of 1271 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2021-11-23 02:33:24,867 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:33:27,795 INFO L134 CoverageAnalysis]: Checked inductivity of 1271 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2021-11-23 02:33:27,795 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [703151921] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:33:27,795 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [959637464] [2021-11-23 02:33:27,797 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-23 02:33:27,798 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:33:27,798 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:33:27,798 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:33:27,798 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:33:27,812 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:33:27,823 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-23 02:33:27,823 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2021-11-23 02:33:27,835 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:33:27,849 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-23 02:33:27,850 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-23 02:33:27,874 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:33:27,876 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 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-23 02:33:27,966 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:33:27,967 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:33:27,989 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-23 02:33:27,989 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 238 treesize of output 237 [2021-11-23 02:33:28,078 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 25 treesize of output 21 [2021-11-23 02:33:28,196 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:33:28,589 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3127#(and (<= |ULTIMATE.start_init_~size#1| 1000000) (<= |ULTIMATE.start_init_~a#1.offset| 0) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (= |ULTIMATE.start_main_~i~1#1| 0) (= |ULTIMATE.start_main_#t~mem6#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~1#1| 4)))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_init_#in~a#1.offset|) (= (ite (= |ULTIMATE.start_main_#t~mem6#1| 0) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1000000 |ULTIMATE.start_init_~size#1|) (<= 0 |ULTIMATE.start_init_#in~a#1.base|) (= |ULTIMATE.start_main_~flag~0#1| 0) (= 1000000 |ULTIMATE.start_init_#in~size#1|) (<= 0 |ULTIMATE.start_init_~a#1.base|) (<= 0 |ULTIMATE.start_init_~a#1.offset|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 1000000 |ULTIMATE.start_init_~i~0#1|) (<= |ULTIMATE.start_init_#in~a#1.offset| 0) (= |#NULL.base| 0))' at error location [2021-11-23 02:33:28,589 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:33:28,589 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:33:28,589 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 48, 48] total 116 [2021-11-23 02:33:28,590 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [646736998] [2021-11-23 02:33:28,590 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:33:28,591 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 116 states [2021-11-23 02:33:28,591 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:33:28,594 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 116 interpolants. [2021-11-23 02:33:28,601 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4868, Invalid=9652, Unknown=0, NotChecked=0, Total=14520 [2021-11-23 02:33:28,602 INFO L87 Difference]: Start difference. First operand 75 states and 78 transitions. Second operand has 116 states, 116 states have (on average 1.0775862068965518) internal successors, (125), 116 states have internal predecessors, (125), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:33:28,940 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:33:28,940 INFO L93 Difference]: Finished difference Result 291 states and 365 transitions. [2021-11-23 02:33:28,941 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 116 states. [2021-11-23 02:33:28,941 INFO L78 Accepts]: Start accepts. Automaton has has 116 states, 116 states have (on average 1.0775862068965518) internal successors, (125), 116 states have internal predecessors, (125), 0 states have call successors, (0), 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 72 [2021-11-23 02:33:28,944 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:33:28,945 INFO L225 Difference]: With dead ends: 291 [2021-11-23 02:33:28,945 INFO L226 Difference]: Without dead ends: 264 [2021-11-23 02:33:28,951 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 236 GetRequests, 117 SyntacticMatches, 0 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2635 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=4868, Invalid=9652, Unknown=0, NotChecked=0, Total=14520 [2021-11-23 02:33:28,953 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 357 mSDsluCounter, 142 mSDsCounter, 0 mSdLazyCounter, 230 mSolverCounterSat, 105 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 357 SdHoareTripleChecker+Valid, 140 SdHoareTripleChecker+Invalid, 335 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 105 IncrementalHoareTripleChecker+Valid, 230 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:33:28,954 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [357 Valid, 140 Invalid, 335 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [105 Valid, 230 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:33:28,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 264 states. [2021-11-23 02:33:28,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 264 to 124. [2021-11-23 02:33:28,973 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 123 states have (on average 1.032520325203252) internal successors, (127), 123 states have internal predecessors, (127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:33:28,974 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 127 transitions. [2021-11-23 02:33:28,974 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 127 transitions. Word has length 72 [2021-11-23 02:33:28,975 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:33:28,975 INFO L470 AbstractCegarLoop]: Abstraction has 124 states and 127 transitions. [2021-11-23 02:33:28,976 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 116 states, 116 states have (on average 1.0775862068965518) internal successors, (125), 116 states have internal predecessors, (125), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:33:28,976 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 127 transitions. [2021-11-23 02:33:28,982 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2021-11-23 02:33:28,982 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:33:28,982 INFO L514 BasicCegarLoop]: trace histogram [94, 20, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:33:29,020 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-23 02:33:29,196 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:33:29,197 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:33:29,197 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:33:29,197 INFO L85 PathProgramCache]: Analyzing trace with hash 592374672, now seen corresponding path program 8 times [2021-11-23 02:33:29,197 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:33:29,197 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1310346743] [2021-11-23 02:33:29,197 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:33:29,198 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:33:29,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:33:29,631 INFO L134 CoverageAnalysis]: Checked inductivity of 4675 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 4465 trivial. 0 not checked. [2021-11-23 02:33:29,631 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:33:29,632 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1310346743] [2021-11-23 02:33:29,632 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1310346743] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:33:29,632 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [15320846] [2021-11-23 02:33:29,632 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:33:29,632 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:33:29,632 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:33:29,633 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:33:29,653 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-23 02:33:30,125 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2021-11-23 02:33:30,125 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:33:30,128 INFO L263 TraceCheckSpWp]: Trace formula consists of 263 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-23 02:33:30,134 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:33:30,297 INFO L134 CoverageAnalysis]: Checked inductivity of 4675 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 4465 trivial. 0 not checked. [2021-11-23 02:33:30,297 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:33:30,889 INFO L134 CoverageAnalysis]: Checked inductivity of 4675 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 4465 trivial. 0 not checked. [2021-11-23 02:33:30,890 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [15320846] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:33:30,890 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2029304585] [2021-11-23 02:33:30,892 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-23 02:33:30,892 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:33:30,892 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:33:30,892 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:33:30,893 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:33:30,907 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:33:30,919 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-23 02:33:30,919 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-23 02:33:30,930 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:33:30,930 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2021-11-23 02:33:30,953 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:33:30,954 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 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-23 02:33:31,029 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:33:31,030 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:33:31,053 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-23 02:33:31,054 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 238 treesize of output 237 [2021-11-23 02:33:31,157 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-23 02:33:31,273 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:33:31,497 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4587#(and (<= |ULTIMATE.start_init_~size#1| 1000000) (<= |ULTIMATE.start_init_~a#1.offset| 0) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (= |ULTIMATE.start_main_~i~1#1| 0) (= |ULTIMATE.start_main_#t~mem6#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~1#1| 4)))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_init_#in~a#1.offset|) (= (ite (= |ULTIMATE.start_main_#t~mem6#1| 0) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1000000 |ULTIMATE.start_init_~size#1|) (<= 0 |ULTIMATE.start_init_#in~a#1.base|) (= |ULTIMATE.start_main_~flag~0#1| 0) (= 1000000 |ULTIMATE.start_init_#in~size#1|) (<= 0 |ULTIMATE.start_init_~a#1.base|) (<= 0 |ULTIMATE.start_init_~a#1.offset|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 1000000 |ULTIMATE.start_init_~i~0#1|) (<= |ULTIMATE.start_init_#in~a#1.offset| 0) (= |#NULL.base| 0))' at error location [2021-11-23 02:33:31,497 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:33:31,497 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:33:31,497 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 45 [2021-11-23 02:33:31,497 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1915007155] [2021-11-23 02:33:31,497 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:33:31,499 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2021-11-23 02:33:31,500 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:33:31,500 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-11-23 02:33:31,501 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1137, Invalid=1313, Unknown=0, NotChecked=0, Total=2450 [2021-11-23 02:33:31,501 INFO L87 Difference]: Start difference. First operand 124 states and 127 transitions. Second operand has 45 states, 45 states have (on average 1.1555555555555554) internal successors, (52), 45 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:33:31,909 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:33:31,909 INFO L93 Difference]: Finished difference Result 441 states and 508 transitions. [2021-11-23 02:33:31,909 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-11-23 02:33:31,909 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 1.1555555555555554) internal successors, (52), 45 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 121 [2021-11-23 02:33:31,910 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:33:31,912 INFO L225 Difference]: With dead ends: 441 [2021-11-23 02:33:31,913 INFO L226 Difference]: Without dead ends: 434 [2021-11-23 02:33:31,914 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 384 GetRequests, 336 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 460 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=1137, Invalid=1313, Unknown=0, NotChecked=0, Total=2450 [2021-11-23 02:33:31,915 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 966 mSDsluCounter, 210 mSDsCounter, 0 mSdLazyCounter, 184 mSolverCounterSat, 164 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 966 SdHoareTripleChecker+Valid, 210 SdHoareTripleChecker+Invalid, 348 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 164 IncrementalHoareTripleChecker+Valid, 184 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:33:31,916 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [966 Valid, 210 Invalid, 348 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [164 Valid, 184 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:33:31,917 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 434 states. [2021-11-23 02:33:31,926 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 434 to 146. [2021-11-23 02:33:31,926 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 146 states, 145 states have (on average 1.0275862068965518) internal successors, (149), 145 states have internal predecessors, (149), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:33:31,927 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 149 transitions. [2021-11-23 02:33:31,927 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 149 transitions. Word has length 121 [2021-11-23 02:33:31,928 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:33:31,928 INFO L470 AbstractCegarLoop]: Abstraction has 146 states and 149 transitions. [2021-11-23 02:33:31,928 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 1.1555555555555554) internal successors, (52), 45 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:33:31,929 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 149 transitions. [2021-11-23 02:33:31,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-11-23 02:33:31,930 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:33:31,930 INFO L514 BasicCegarLoop]: trace histogram [94, 42, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:33:31,958 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-23 02:33:32,140 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-23 02:33:32,142 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:33:32,143 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:33:32,143 INFO L85 PathProgramCache]: Analyzing trace with hash -409594672, now seen corresponding path program 9 times [2021-11-23 02:33:32,143 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:33:32,143 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2011041044] [2021-11-23 02:33:32,143 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:33:32,143 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:33:32,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:33:32,973 INFO L134 CoverageAnalysis]: Checked inductivity of 5368 backedges. 0 proven. 903 refuted. 0 times theorem prover too weak. 4465 trivial. 0 not checked. [2021-11-23 02:33:32,974 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:33:32,974 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2011041044] [2021-11-23 02:33:32,974 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2011041044] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:33:32,974 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [320716542] [2021-11-23 02:33:32,974 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:33:32,974 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:33:32,974 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:33:32,975 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:33:32,979 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-23 02:33:33,149 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:33:33,149 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:33:33,155 INFO L263 TraceCheckSpWp]: Trace formula consists of 795 conjuncts, 98 conjunts are in the unsatisfiable core [2021-11-23 02:33:33,162 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:33:38,732 INFO L134 CoverageAnalysis]: Checked inductivity of 5368 backedges. 0 proven. 4465 refuted. 0 times theorem prover too weak. 903 trivial. 0 not checked. [2021-11-23 02:33:38,732 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:33:50,144 INFO L134 CoverageAnalysis]: Checked inductivity of 5368 backedges. 0 proven. 4465 refuted. 0 times theorem prover too weak. 903 trivial. 0 not checked. [2021-11-23 02:33:50,144 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [320716542] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:33:50,144 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [783424762] [2021-11-23 02:33:50,146 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-23 02:33:50,147 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:33:50,147 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:33:50,147 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:33:50,147 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:33:50,166 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:33:50,176 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-23 02:33:50,176 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2021-11-23 02:33:50,183 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:33:50,194 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-23 02:33:50,195 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-23 02:33:50,232 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:33:50,233 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 0 case distinctions, treesize of input 39 treesize of output 41 [2021-11-23 02:33:50,286 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:33:50,288 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:33:50,292 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:33:50,305 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-23 02:33:50,305 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 248 treesize of output 236 [2021-11-23 02:33:50,362 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 25 treesize of output 21 [2021-11-23 02:33:50,485 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:33:50,996 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6587#(and (<= |ULTIMATE.start_init_~size#1| 1000000) (<= |ULTIMATE.start_init_~a#1.offset| 0) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (= |ULTIMATE.start_main_~i~1#1| 0) (= |ULTIMATE.start_main_#t~mem6#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~1#1| 4)))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_init_#in~a#1.offset|) (= (ite (= |ULTIMATE.start_main_#t~mem6#1| 0) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1000000 |ULTIMATE.start_init_~size#1|) (<= 0 |ULTIMATE.start_init_#in~a#1.base|) (= |ULTIMATE.start_main_~flag~0#1| 0) (= 1000000 |ULTIMATE.start_init_#in~size#1|) (<= 0 |ULTIMATE.start_init_~a#1.base|) (<= 0 |ULTIMATE.start_init_~a#1.offset|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 1000000 |ULTIMATE.start_init_~i~0#1|) (<= |ULTIMATE.start_init_#in~a#1.offset| 0) (= |#NULL.base| 0))' at error location [2021-11-23 02:33:50,996 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:33:50,996 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:33:50,997 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 96, 96] total 235 [2021-11-23 02:33:50,997 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1702792530] [2021-11-23 02:33:50,997 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:33:50,998 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 235 states [2021-11-23 02:33:50,998 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:33:51,003 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 235 interpolants. [2021-11-23 02:33:51,015 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19472, Invalid=37888, Unknown=0, NotChecked=0, Total=57360 [2021-11-23 02:33:51,016 INFO L87 Difference]: Start difference. First operand 146 states and 149 transitions. Second operand has 235 states, 235 states have (on average 1.0382978723404255) internal successors, (244), 235 states have internal predecessors, (244), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:33:51,978 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:33:51,978 INFO L93 Difference]: Finished difference Result 594 states and 739 transitions. [2021-11-23 02:33:51,979 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 235 states. [2021-11-23 02:33:51,979 INFO L78 Accepts]: Start accepts. Automaton has has 235 states, 235 states have (on average 1.0382978723404255) internal successors, (244), 235 states have internal predecessors, (244), 0 states have call successors, (0), 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 143 [2021-11-23 02:33:51,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:33:51,982 INFO L225 Difference]: With dead ends: 594 [2021-11-23 02:33:51,982 INFO L226 Difference]: Without dead ends: 544 [2021-11-23 02:33:51,988 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 472 GetRequests, 234 SyntacticMatches, 0 SemanticMatches, 238 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9733 ImplicationChecksByTransitivity, 17.2s TimeCoverageRelationStatistics Valid=19472, Invalid=37888, Unknown=0, NotChecked=0, Total=57360 [2021-11-23 02:33:51,989 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 1162 mSDsluCounter, 251 mSDsCounter, 0 mSdLazyCounter, 408 mSolverCounterSat, 269 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1162 SdHoareTripleChecker+Valid, 250 SdHoareTripleChecker+Invalid, 677 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 269 IncrementalHoareTripleChecker+Valid, 408 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:33:51,989 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1162 Valid, 250 Invalid, 677 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [269 Valid, 408 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 02:33:51,990 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 544 states. [2021-11-23 02:33:52,002 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 544 to 243. [2021-11-23 02:33:52,003 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 243 states, 242 states have (on average 1.0165289256198347) internal successors, (246), 242 states have internal predecessors, (246), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:33:52,004 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 243 states to 243 states and 246 transitions. [2021-11-23 02:33:52,005 INFO L78 Accepts]: Start accepts. Automaton has 243 states and 246 transitions. Word has length 143 [2021-11-23 02:33:52,005 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:33:52,005 INFO L470 AbstractCegarLoop]: Abstraction has 243 states and 246 transitions. [2021-11-23 02:33:52,006 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 235 states, 235 states have (on average 1.0382978723404255) internal successors, (244), 235 states have internal predecessors, (244), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:33:52,006 INFO L276 IsEmpty]: Start isEmpty. Operand 243 states and 246 transitions. [2021-11-23 02:33:52,008 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 241 [2021-11-23 02:33:52,008 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:33:52,008 INFO L514 BasicCegarLoop]: trace histogram [190, 43, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:33:52,033 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2021-11-23 02:33:52,220 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-23 02:33:52,220 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:33:52,220 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:33:52,221 INFO L85 PathProgramCache]: Analyzing trace with hash -427545618, now seen corresponding path program 10 times [2021-11-23 02:33:52,221 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:33:52,221 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1858116199] [2021-11-23 02:33:52,221 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:33:52,221 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:33:52,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:33:53,341 INFO L134 CoverageAnalysis]: Checked inductivity of 19091 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 18145 trivial. 0 not checked. [2021-11-23 02:33:53,342 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:33:53,342 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1858116199] [2021-11-23 02:33:53,342 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1858116199] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:33:53,342 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1600499341] [2021-11-23 02:33:53,342 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:33:53,342 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:33:53,343 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:33:53,343 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:33:53,360 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-23 02:33:53,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:33:53,655 INFO L263 TraceCheckSpWp]: Trace formula consists of 1375 conjuncts, 194 conjunts are in the unsatisfiable core [2021-11-23 02:33:53,662 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:34:10,738 INFO L134 CoverageAnalysis]: Checked inductivity of 19091 backedges. 0 proven. 18145 refuted. 0 times theorem prover too weak. 946 trivial. 0 not checked. [2021-11-23 02:34:10,738 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:34:52,782 INFO L134 CoverageAnalysis]: Checked inductivity of 19091 backedges. 0 proven. 18145 refuted. 0 times theorem prover too weak. 946 trivial. 0 not checked. [2021-11-23 02:34:52,782 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1600499341] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:34:52,783 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [540241325] [2021-11-23 02:34:52,784 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-23 02:34:52,785 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:34:52,785 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:34:52,785 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:34:52,785 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:34:52,801 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:34:52,815 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-23 02:34:52,815 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2021-11-23 02:34:52,822 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:34:52,833 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-23 02:34:52,834 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-23 02:34:52,853 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:34:52,854 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 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-23 02:34:52,914 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:34:52,914 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:34:52,933 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-23 02:34:52,934 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 238 treesize of output 237 [2021-11-23 02:34:53,006 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 25 treesize of output 21 [2021-11-23 02:34:53,085 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:34:54,076 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9850#(and (<= |ULTIMATE.start_init_~size#1| 1000000) (<= |ULTIMATE.start_init_~a#1.offset| 0) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (= |ULTIMATE.start_main_~i~1#1| 0) (= |ULTIMATE.start_main_#t~mem6#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~1#1| 4)))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_init_#in~a#1.offset|) (= (ite (= |ULTIMATE.start_main_#t~mem6#1| 0) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1000000 |ULTIMATE.start_init_~size#1|) (<= 0 |ULTIMATE.start_init_#in~a#1.base|) (= |ULTIMATE.start_main_~flag~0#1| 0) (= 1000000 |ULTIMATE.start_init_#in~size#1|) (<= 0 |ULTIMATE.start_init_~a#1.base|) (<= 0 |ULTIMATE.start_init_~a#1.offset|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 1000000 |ULTIMATE.start_init_~i~0#1|) (<= |ULTIMATE.start_init_#in~a#1.offset| 0) (= |#NULL.base| 0))' at error location [2021-11-23 02:34:54,076 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:34:54,076 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:34:54,076 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 192, 192] total 428 [2021-11-23 02:34:54,076 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [90287242] [2021-11-23 02:34:54,077 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:34:54,078 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 428 states [2021-11-23 02:34:54,078 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:34:54,087 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 428 interpolants. [2021-11-23 02:34:54,099 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=74720, Invalid=112336, Unknown=0, NotChecked=0, Total=187056 [2021-11-23 02:34:54,100 INFO L87 Difference]: Start difference. First operand 243 states and 246 transitions. Second operand has 428 states, 428 states have (on average 1.0210280373831775) internal successors, (437), 428 states have internal predecessors, (437), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:34:57,369 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:34:57,370 INFO L93 Difference]: Finished difference Result 795 states and 1037 transitions. [2021-11-23 02:34:57,370 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 428 states. [2021-11-23 02:34:57,371 INFO L78 Accepts]: Start accepts. Automaton has has 428 states, 428 states have (on average 1.0210280373831775) internal successors, (437), 428 states have internal predecessors, (437), 0 states have call successors, (0), 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 240 [2021-11-23 02:34:57,372 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:34:57,376 INFO L225 Difference]: With dead ends: 795 [2021-11-23 02:34:57,376 INFO L226 Difference]: Without dead ends: 744 [2021-11-23 02:34:57,388 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 764 GetRequests, 333 SyntacticMatches, 0 SemanticMatches, 431 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19627 ImplicationChecksByTransitivity, 59.4s TimeCoverageRelationStatistics Valid=74720, Invalid=112336, Unknown=0, NotChecked=0, Total=187056 [2021-11-23 02:34:57,389 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 1330 mSDsluCounter, 274 mSDsCounter, 0 mSdLazyCounter, 626 mSolverCounterSat, 390 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1330 SdHoareTripleChecker+Valid, 270 SdHoareTripleChecker+Invalid, 1016 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 390 IncrementalHoareTripleChecker+Valid, 626 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 02:34:57,390 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1330 Valid, 270 Invalid, 1016 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [390 Valid, 626 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-23 02:34:57,393 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 744 states. [2021-11-23 02:34:57,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 744 to 436. [2021-11-23 02:34:57,419 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 436 states, 435 states have (on average 1.0091954022988505) internal successors, (439), 435 states have internal predecessors, (439), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:34:57,421 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 436 states to 436 states and 439 transitions. [2021-11-23 02:34:57,421 INFO L78 Accepts]: Start accepts. Automaton has 436 states and 439 transitions. Word has length 240 [2021-11-23 02:34:57,422 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:34:57,423 INFO L470 AbstractCegarLoop]: Abstraction has 436 states and 439 transitions. [2021-11-23 02:34:57,423 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 428 states, 428 states have (on average 1.0210280373831775) internal successors, (437), 428 states have internal predecessors, (437), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:34:57,424 INFO L276 IsEmpty]: Start isEmpty. Operand 436 states and 439 transitions. [2021-11-23 02:34:57,431 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 434 [2021-11-23 02:34:57,432 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:34:57,432 INFO L514 BasicCegarLoop]: trace histogram [382, 44, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:34:57,467 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-23 02:34:57,652 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:34:57,652 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:34:57,652 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:34:57,652 INFO L85 PathProgramCache]: Analyzing trace with hash 1080218768, now seen corresponding path program 11 times [2021-11-23 02:34:57,652 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:34:57,652 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1495734031] [2021-11-23 02:34:57,653 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:34:57,653 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:34:58,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:34:59,044 INFO L134 CoverageAnalysis]: Checked inductivity of 74143 backedges. 0 proven. 990 refuted. 0 times theorem prover too weak. 73153 trivial. 0 not checked. [2021-11-23 02:34:59,044 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:34:59,044 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1495734031] [2021-11-23 02:34:59,045 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1495734031] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:34:59,045 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1522540319] [2021-11-23 02:34:59,045 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:34:59,045 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:34:59,045 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:34:59,046 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:34:59,071 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-23 02:35:21,497 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 23 check-sat command(s) [2021-11-23 02:35:21,497 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:35:21,519 INFO L263 TraceCheckSpWp]: Trace formula consists of 503 conjuncts, 46 conjunts are in the unsatisfiable core [2021-11-23 02:35:21,527 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:35:22,043 INFO L134 CoverageAnalysis]: Checked inductivity of 74143 backedges. 0 proven. 990 refuted. 0 times theorem prover too weak. 73153 trivial. 0 not checked. [2021-11-23 02:35:22,043 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:35:24,473 INFO L134 CoverageAnalysis]: Checked inductivity of 74143 backedges. 0 proven. 990 refuted. 0 times theorem prover too weak. 73153 trivial. 0 not checked. [2021-11-23 02:35:24,473 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1522540319] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:35:24,474 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [691814777] [2021-11-23 02:35:24,475 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-23 02:35:24,475 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:35:24,476 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:35:24,476 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:35:24,476 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:35:24,516 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:35:24,527 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-23 02:35:24,527 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2021-11-23 02:35:24,535 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:35:24,549 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-23 02:35:24,549 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-23 02:35:24,572 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:35:24,576 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 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-23 02:35:24,637 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:35:24,638 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:35:24,657 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-23 02:35:24,657 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 238 treesize of output 237 [2021-11-23 02:35:24,752 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 25 treesize of output 21 [2021-11-23 02:35:24,864 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:35:25,063 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '14718#(and (<= |ULTIMATE.start_init_~size#1| 1000000) (<= |ULTIMATE.start_init_~a#1.offset| 0) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (= |ULTIMATE.start_main_~i~1#1| 0) (= |ULTIMATE.start_main_#t~mem6#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~1#1| 4)))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_init_#in~a#1.offset|) (= (ite (= |ULTIMATE.start_main_#t~mem6#1| 0) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1000000 |ULTIMATE.start_init_~size#1|) (<= 0 |ULTIMATE.start_init_#in~a#1.base|) (= |ULTIMATE.start_main_~flag~0#1| 0) (= 1000000 |ULTIMATE.start_init_#in~size#1|) (<= 0 |ULTIMATE.start_init_~a#1.base|) (<= 0 |ULTIMATE.start_init_~a#1.offset|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 1000000 |ULTIMATE.start_init_~i~0#1|) (<= |ULTIMATE.start_init_#in~a#1.offset| 0) (= |#NULL.base| 0))' at error location [2021-11-23 02:35:25,063 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:35:25,063 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:35:25,064 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 93 [2021-11-23 02:35:25,064 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [66010233] [2021-11-23 02:35:25,064 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:35:25,065 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 93 states [2021-11-23 02:35:25,065 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:35:25,066 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 93 interpolants. [2021-11-23 02:35:25,067 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4569, Invalid=4937, Unknown=0, NotChecked=0, Total=9506 [2021-11-23 02:35:25,067 INFO L87 Difference]: Start difference. First operand 436 states and 439 transitions. Second operand has 93 states, 93 states have (on average 1.075268817204301) internal successors, (100), 93 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:35:27,178 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:35:27,178 INFO L93 Difference]: Finished difference Result 1113 states and 1252 transitions. [2021-11-23 02:35:27,178 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 92 states. [2021-11-23 02:35:27,178 INFO L78 Accepts]: Start accepts. Automaton has has 93 states, 93 states have (on average 1.075268817204301) internal successors, (100), 93 states have internal predecessors, (100), 0 states have call successors, (0), 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 433 [2021-11-23 02:35:27,179 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:35:27,185 INFO L225 Difference]: With dead ends: 1113 [2021-11-23 02:35:27,185 INFO L226 Difference]: Without dead ends: 1106 [2021-11-23 02:35:27,186 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1344 GetRequests, 1248 SyntacticMatches, 0 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 988 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=4569, Invalid=4937, Unknown=0, NotChecked=0, Total=9506 [2021-11-23 02:35:27,187 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 2569 mSDsluCounter, 452 mSDsCounter, 0 mSdLazyCounter, 380 mSolverCounterSat, 421 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2569 SdHoareTripleChecker+Valid, 450 SdHoareTripleChecker+Invalid, 801 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 421 IncrementalHoareTripleChecker+Valid, 380 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:35:27,187 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2569 Valid, 450 Invalid, 801 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [421 Valid, 380 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-23 02:35:27,189 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1106 states. [2021-11-23 02:35:27,210 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1106 to 482. [2021-11-23 02:35:27,211 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 482 states, 481 states have (on average 1.0083160083160083) internal successors, (485), 481 states have internal predecessors, (485), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:35:27,213 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 482 states to 482 states and 485 transitions. [2021-11-23 02:35:27,213 INFO L78 Accepts]: Start accepts. Automaton has 482 states and 485 transitions. Word has length 433 [2021-11-23 02:35:27,214 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:35:27,214 INFO L470 AbstractCegarLoop]: Abstraction has 482 states and 485 transitions. [2021-11-23 02:35:27,215 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 93 states, 93 states have (on average 1.075268817204301) internal successors, (100), 93 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:35:27,215 INFO L276 IsEmpty]: Start isEmpty. Operand 482 states and 485 transitions. [2021-11-23 02:35:27,224 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 480 [2021-11-23 02:35:27,225 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:35:27,225 INFO L514 BasicCegarLoop]: trace histogram [382, 90, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:35:27,263 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-23 02:35:27,425 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-23 02:35:27,426 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:35:27,426 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:35:27,426 INFO L85 PathProgramCache]: Analyzing trace with hash 155912912, now seen corresponding path program 12 times [2021-11-23 02:35:27,426 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:35:27,426 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [534645776] [2021-11-23 02:35:27,426 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:35:27,426 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:35:27,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:35:30,810 INFO L134 CoverageAnalysis]: Checked inductivity of 77248 backedges. 0 proven. 4095 refuted. 0 times theorem prover too weak. 73153 trivial. 0 not checked. [2021-11-23 02:35:30,810 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:35:30,810 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [534645776] [2021-11-23 02:35:30,810 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [534645776] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:35:30,810 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [863627868] [2021-11-23 02:35:30,811 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:35:30,811 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:35:30,811 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:35:30,811 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:35:30,812 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-23 02:35:31,251 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:35:31,251 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:35:31,280 INFO L263 TraceCheckSpWp]: Trace formula consists of 2715 conjuncts, 386 conjunts are in the unsatisfiable core [2021-11-23 02:35:31,291 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:36:37,091 INFO L134 CoverageAnalysis]: Checked inductivity of 77248 backedges. 0 proven. 73153 refuted. 0 times theorem prover too weak. 4095 trivial. 0 not checked. [2021-11-23 02:36:37,092 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:39:31,247 INFO L134 CoverageAnalysis]: Checked inductivity of 77248 backedges. 0 proven. 73153 refuted. 0 times theorem prover too weak. 4095 trivial. 0 not checked. [2021-11-23 02:39:31,248 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [863627868] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:39:31,248 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1333464791] [2021-11-23 02:39:31,250 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-23 02:39:31,250 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:39:31,250 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:39:31,250 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:39:31,251 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:39:31,268 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:39:31,282 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-23 02:39:31,282 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-23 02:39:31,289 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:39:31,290 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2021-11-23 02:39:31,319 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:39:31,320 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 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-23 02:39:31,380 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:39:31,381 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:39:31,403 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-23 02:39:31,403 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 238 treesize of output 237 [2021-11-23 02:39:31,488 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-23 02:39:31,572 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:39:33,302 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '21086#(and (<= |ULTIMATE.start_init_~size#1| 1000000) (<= |ULTIMATE.start_init_~a#1.offset| 0) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (= |ULTIMATE.start_main_~i~1#1| 0) (= |ULTIMATE.start_main_#t~mem6#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~1#1| 4)))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_init_#in~a#1.offset|) (= (ite (= |ULTIMATE.start_main_#t~mem6#1| 0) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1000000 |ULTIMATE.start_init_~size#1|) (<= 0 |ULTIMATE.start_init_#in~a#1.base|) (= |ULTIMATE.start_main_~flag~0#1| 0) (= 1000000 |ULTIMATE.start_init_#in~size#1|) (<= 0 |ULTIMATE.start_init_~a#1.base|) (<= 0 |ULTIMATE.start_init_~a#1.offset|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 1000000 |ULTIMATE.start_init_~i~0#1|) (<= |ULTIMATE.start_init_#in~a#1.offset| 0) (= |#NULL.base| 0))' at error location [2021-11-23 02:39:33,302 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:39:33,302 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:39:33,302 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [93, 384, 384] total 859 [2021-11-23 02:39:33,303 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [56164623] [2021-11-23 02:39:33,303 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:39:33,305 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 859 states [2021-11-23 02:39:33,305 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:39:33,343 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 859 interpolants. [2021-11-23 02:39:33,379 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=299096, Invalid=446536, Unknown=0, NotChecked=0, Total=745632 [2021-11-23 02:39:33,380 INFO L87 Difference]: Start difference. First operand 482 states and 485 transitions. Second operand has 859 states, 859 states have (on average 1.010477299185099) internal successors, (868), 859 states have internal predecessors, (868), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:40:00,779 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:40:00,780 INFO L93 Difference]: Finished difference Result 1602 states and 2083 transitions. [2021-11-23 02:40:00,781 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 859 states. [2021-11-23 02:40:00,782 INFO L78 Accepts]: Start accepts. Automaton has has 859 states, 859 states have (on average 1.010477299185099) internal successors, (868), 859 states have internal predecessors, (868), 0 states have call successors, (0), 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 479 [2021-11-23 02:40:00,782 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:40:00,790 INFO L225 Difference]: With dead ends: 1602 [2021-11-23 02:40:00,790 INFO L226 Difference]: Without dead ends: 1504 [2021-11-23 02:40:00,837 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1528 GetRequests, 666 SyntacticMatches, 0 SemanticMatches, 862 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 75397 ImplicationChecksByTransitivity, 241.6s TimeCoverageRelationStatistics Valid=299096, Invalid=446536, Unknown=0, NotChecked=0, Total=745632 [2021-11-23 02:40:00,838 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 2436 mSDsluCounter, 521 mSDsCounter, 0 mSdLazyCounter, 1212 mSolverCounterSat, 745 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2436 SdHoareTripleChecker+Valid, 515 SdHoareTripleChecker+Invalid, 1957 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 745 IncrementalHoareTripleChecker+Valid, 1212 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:40:00,838 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2436 Valid, 515 Invalid, 1957 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [745 Valid, 1212 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2021-11-23 02:40:00,840 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1504 states. [2021-11-23 02:40:00,875 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1504 to 867. [2021-11-23 02:40:00,877 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 867 states, 866 states have (on average 1.0046189376443417) internal successors, (870), 866 states have internal predecessors, (870), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:40:00,880 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 867 states to 867 states and 870 transitions. [2021-11-23 02:40:00,880 INFO L78 Accepts]: Start accepts. Automaton has 867 states and 870 transitions. Word has length 479 [2021-11-23 02:40:00,881 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:40:00,881 INFO L470 AbstractCegarLoop]: Abstraction has 867 states and 870 transitions. [2021-11-23 02:40:00,883 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 859 states, 859 states have (on average 1.010477299185099) internal successors, (868), 859 states have internal predecessors, (868), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:40:00,883 INFO L276 IsEmpty]: Start isEmpty. Operand 867 states and 870 transitions. [2021-11-23 02:40:00,912 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 865 [2021-11-23 02:40:00,912 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:40:00,913 INFO L514 BasicCegarLoop]: trace histogram [766, 91, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:40:00,949 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2021-11-23 02:40:01,140 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-23 02:40:01,140 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:40:01,141 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:40:01,141 INFO L85 PathProgramCache]: Analyzing trace with hash 1821841902, now seen corresponding path program 13 times [2021-11-23 02:40:01,141 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:40:01,141 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [162970232] [2021-11-23 02:40:01,141 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:40:01,141 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:40:01,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:40:05,205 INFO L134 CoverageAnalysis]: Checked inductivity of 297947 backedges. 0 proven. 4186 refuted. 0 times theorem prover too weak. 293761 trivial. 0 not checked. [2021-11-23 02:40:05,205 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:40:05,205 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [162970232] [2021-11-23 02:40:05,206 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [162970232] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:40:05,206 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1584114181] [2021-11-23 02:40:05,206 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:40:05,206 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:40:05,206 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:40:05,207 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:40:05,207 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31c6b25a-5a0a-4aad-8591-e311d0a9114e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-23 02:40:06,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:40:06,075 INFO L263 TraceCheckSpWp]: Trace formula consists of 5023 conjuncts, 770 conjunts are in the unsatisfiable core [2021-11-23 02:40:06,105 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:44:07,979 INFO L134 CoverageAnalysis]: Checked inductivity of 297947 backedges. 0 proven. 293761 refuted. 0 times theorem prover too weak. 4186 trivial. 0 not checked. [2021-11-23 02:44:07,979 INFO L328 TraceCheckSpWp]: Computing backward predicates...