./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loops-crafted-1/watermelon.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 5e519f3a Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/config/TaipanReach.xml -i ../../sv-benchmarks/c/loops-crafted-1/watermelon.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI --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 dda0b992ac1600896503297d86377b482d0a82ded923ea00c7e9ff3fed4db7e7 --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-5e519f3 [2022-11-03 04:01:42,278 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-03 04:01:42,281 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-03 04:01:42,312 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-03 04:01:42,313 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-03 04:01:42,314 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-03 04:01:42,316 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-03 04:01:42,318 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-03 04:01:42,319 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-03 04:01:42,320 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-03 04:01:42,321 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-03 04:01:42,322 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-03 04:01:42,323 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-03 04:01:42,324 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-03 04:01:42,325 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-03 04:01:42,327 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-03 04:01:42,328 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-03 04:01:42,329 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-03 04:01:42,330 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-03 04:01:42,332 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-03 04:01:42,334 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-03 04:01:42,335 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-03 04:01:42,337 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-03 04:01:42,338 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-03 04:01:42,341 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-03 04:01:42,342 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-03 04:01:42,342 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-03 04:01:42,343 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-03 04:01:42,344 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-03 04:01:42,345 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-03 04:01:42,346 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-03 04:01:42,347 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-03 04:01:42,347 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-03 04:01:42,348 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-03 04:01:42,349 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-03 04:01:42,350 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-03 04:01:42,351 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-03 04:01:42,351 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-03 04:01:42,351 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-03 04:01:42,352 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-03 04:01:42,353 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-03 04:01:42,358 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-03 04:01:42,394 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-03 04:01:42,399 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-03 04:01:42,400 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-03 04:01:42,400 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-03 04:01:42,401 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-03 04:01:42,401 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-03 04:01:42,402 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-03 04:01:42,402 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-03 04:01:42,402 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-03 04:01:42,402 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-03 04:01:42,403 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-03 04:01:42,403 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-03 04:01:42,404 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-03 04:01:42,404 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-03 04:01:42,404 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-03 04:01:42,404 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-03 04:01:42,405 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-03 04:01:42,405 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-03 04:01:42,405 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-03 04:01:42,406 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-03 04:01:42,406 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-03 04:01:42,406 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-03 04:01:42,406 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-03 04:01:42,408 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-03 04:01:42,408 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-03 04:01:42,408 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-03 04:01:42,409 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-03 04:01:42,409 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-03 04:01:42,409 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-03 04:01:42,409 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-03 04:01:42,409 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-03 04:01:42,410 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-03 04:01:42,410 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-03 04:01:42,410 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-03 04:01:42,410 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-03 04:01:42,411 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-03 04:01:42,411 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-03 04:01:42,411 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-03 04:01:42,411 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-03 04:01:42,412 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-03 04:01:42,412 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-03 04:01:42,413 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode 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_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> dda0b992ac1600896503297d86377b482d0a82ded923ea00c7e9ff3fed4db7e7 [2022-11-03 04:01:42,744 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-03 04:01:42,775 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-03 04:01:42,778 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-03 04:01:42,779 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-03 04:01:42,781 INFO L275 PluginConnector]: CDTParser initialized [2022-11-03 04:01:42,782 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/../../sv-benchmarks/c/loops-crafted-1/watermelon.c [2022-11-03 04:01:42,879 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/data/fead2e0d7/6e3bfee51ae94e60a46ad1904f51939a/FLAG196cabcd4 [2022-11-03 04:01:43,481 INFO L306 CDTParser]: Found 1 translation units. [2022-11-03 04:01:43,482 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/sv-benchmarks/c/loops-crafted-1/watermelon.c [2022-11-03 04:01:43,489 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/data/fead2e0d7/6e3bfee51ae94e60a46ad1904f51939a/FLAG196cabcd4 [2022-11-03 04:01:43,509 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/data/fead2e0d7/6e3bfee51ae94e60a46ad1904f51939a [2022-11-03 04:01:43,511 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-03 04:01:43,512 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-03 04:01:43,515 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-03 04:01:43,515 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-03 04:01:43,526 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-03 04:01:43,527 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 04:01:43" (1/1) ... [2022-11-03 04:01:43,529 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@415f1eab and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:01:43, skipping insertion in model container [2022-11-03 04:01:43,529 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 04:01:43" (1/1) ... [2022-11-03 04:01:43,538 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-03 04:01:43,555 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-03 04:01:43,730 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_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/sv-benchmarks/c/loops-crafted-1/watermelon.c[373,386] [2022-11-03 04:01:43,745 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-03 04:01:43,755 INFO L203 MainTranslator]: Completed pre-run [2022-11-03 04:01:43,770 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_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/sv-benchmarks/c/loops-crafted-1/watermelon.c[373,386] [2022-11-03 04:01:43,794 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-03 04:01:43,813 INFO L208 MainTranslator]: Completed translation [2022-11-03 04:01:43,814 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:01:43 WrapperNode [2022-11-03 04:01:43,814 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-03 04:01:43,816 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-03 04:01:43,816 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-03 04:01:43,816 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-03 04:01:43,825 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:01:43" (1/1) ... [2022-11-03 04:01:43,834 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:01:43" (1/1) ... [2022-11-03 04:01:43,856 INFO L138 Inliner]: procedures = 15, calls = 10, calls flagged for inlining = 5, calls inlined = 5, statements flattened = 64 [2022-11-03 04:01:43,857 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-03 04:01:43,857 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-03 04:01:43,858 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-03 04:01:43,858 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-03 04:01:43,868 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:01:43" (1/1) ... [2022-11-03 04:01:43,868 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:01:43" (1/1) ... [2022-11-03 04:01:43,879 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:01:43" (1/1) ... [2022-11-03 04:01:43,879 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:01:43" (1/1) ... [2022-11-03 04:01:43,886 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:01:43" (1/1) ... [2022-11-03 04:01:43,891 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:01:43" (1/1) ... [2022-11-03 04:01:43,892 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:01:43" (1/1) ... [2022-11-03 04:01:43,893 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:01:43" (1/1) ... [2022-11-03 04:01:43,895 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-03 04:01:43,896 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-03 04:01:43,896 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-03 04:01:43,897 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-03 04:01:43,898 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:01:43" (1/1) ... [2022-11-03 04:01:43,906 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-03 04:01:43,919 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 04:01:43,935 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-03 04:01:43,954 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-03 04:01:43,975 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-03 04:01:43,976 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-03 04:01:43,976 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-03 04:01:43,976 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-03 04:01:44,045 INFO L235 CfgBuilder]: Building ICFG [2022-11-03 04:01:44,047 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-03 04:01:44,271 INFO L276 CfgBuilder]: Performing block encoding [2022-11-03 04:01:44,331 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-03 04:01:44,331 INFO L300 CfgBuilder]: Removed 2 assume(true) statements. [2022-11-03 04:01:44,333 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 04:01:44 BoogieIcfgContainer [2022-11-03 04:01:44,334 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-03 04:01:44,336 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-03 04:01:44,336 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-03 04:01:44,340 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-03 04:01:44,341 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 03.11 04:01:43" (1/3) ... [2022-11-03 04:01:44,341 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1c2fb702 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 04:01:44, skipping insertion in model container [2022-11-03 04:01:44,342 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:01:43" (2/3) ... [2022-11-03 04:01:44,342 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1c2fb702 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 04:01:44, skipping insertion in model container [2022-11-03 04:01:44,342 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 04:01:44" (3/3) ... [2022-11-03 04:01:44,343 INFO L112 eAbstractionObserver]: Analyzing ICFG watermelon.c [2022-11-03 04:01:44,362 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-03 04:01:44,363 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-03 04:01:44,415 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-03 04:01:44,423 INFO L357 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, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@14668377, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-03 04:01:44,423 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-03 04:01:44,428 INFO L276 IsEmpty]: Start isEmpty. Operand has 14 states, 12 states have (on average 1.5833333333333333) internal successors, (19), 13 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) [2022-11-03 04:01:44,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-11-03 04:01:44,436 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 04:01:44,437 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 04:01:44,437 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 04:01:44,443 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 04:01:44,444 INFO L85 PathProgramCache]: Analyzing trace with hash -1927148626, now seen corresponding path program 1 times [2022-11-03 04:01:44,456 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 04:01:44,456 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1565794619] [2022-11-03 04:01:44,457 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 04:01:44,458 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 04:01:44,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 04:01:44,953 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 04:01:44,954 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 04:01:44,954 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1565794619] [2022-11-03 04:01:44,955 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1565794619] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 04:01:44,955 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 04:01:44,956 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-11-03 04:01:44,957 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [433240591] [2022-11-03 04:01:44,958 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 04:01:44,962 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-03 04:01:44,962 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 04:01:45,014 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-03 04:01:45,015 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-03 04:01:45,017 INFO L87 Difference]: Start difference. First operand has 14 states, 12 states have (on average 1.5833333333333333) internal successors, (19), 13 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) Second operand has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 6 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) [2022-11-03 04:01:45,154 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 04:01:45,155 INFO L93 Difference]: Finished difference Result 36 states and 41 transitions. [2022-11-03 04:01:45,156 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-03 04:01:45,157 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 6 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 [2022-11-03 04:01:45,158 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 04:01:45,166 INFO L225 Difference]: With dead ends: 36 [2022-11-03 04:01:45,166 INFO L226 Difference]: Without dead ends: 18 [2022-11-03 04:01:45,169 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=34, Invalid=56, Unknown=0, NotChecked=0, Total=90 [2022-11-03 04:01:45,173 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 40 mSDsluCounter, 49 mSDsCounter, 0 mSdLazyCounter, 53 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 53 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 04:01:45,174 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [40 Valid, 38 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 53 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 04:01:45,192 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2022-11-03 04:01:45,205 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 13. [2022-11-03 04:01:45,207 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 12 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) [2022-11-03 04:01:45,208 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 16 transitions. [2022-11-03 04:01:45,209 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 16 transitions. Word has length 8 [2022-11-03 04:01:45,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 04:01:45,210 INFO L495 AbstractCegarLoop]: Abstraction has 13 states and 16 transitions. [2022-11-03 04:01:45,211 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 6 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) [2022-11-03 04:01:45,211 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 16 transitions. [2022-11-03 04:01:45,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-03 04:01:45,213 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 04:01:45,213 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 04:01:45,213 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-03 04:01:45,214 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 04:01:45,215 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 04:01:45,215 INFO L85 PathProgramCache]: Analyzing trace with hash 390039330, now seen corresponding path program 1 times [2022-11-03 04:01:45,216 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 04:01:45,216 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [66999357] [2022-11-03 04:01:45,216 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 04:01:45,217 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 04:01:45,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 04:01:45,332 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 04:01:45,333 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 04:01:45,333 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [66999357] [2022-11-03 04:01:45,334 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [66999357] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 04:01:45,334 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 04:01:45,335 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-03 04:01:45,335 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1229610974] [2022-11-03 04:01:45,335 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 04:01:45,345 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 04:01:45,346 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 04:01:45,347 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 04:01:45,347 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-03 04:01:45,348 INFO L87 Difference]: Start difference. First operand 13 states and 16 transitions. Second operand has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 04:01:45,371 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 04:01:45,371 INFO L93 Difference]: Finished difference Result 18 states and 21 transitions. [2022-11-03 04:01:45,372 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 04:01:45,372 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2022-11-03 04:01:45,372 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 04:01:45,373 INFO L225 Difference]: With dead ends: 18 [2022-11-03 04:01:45,373 INFO L226 Difference]: Without dead ends: 14 [2022-11-03 04:01:45,377 INFO L412 NwaCegarLoop]: 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 [2022-11-03 04:01:45,379 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 0 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-03 04:01:45,380 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 12 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-03 04:01:45,383 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2022-11-03 04:01:45,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2022-11-03 04:01:45,389 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.3076923076923077) internal successors, (17), 13 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) [2022-11-03 04:01:45,391 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 17 transitions. [2022-11-03 04:01:45,394 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 17 transitions. Word has length 9 [2022-11-03 04:01:45,394 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 04:01:45,396 INFO L495 AbstractCegarLoop]: Abstraction has 14 states and 17 transitions. [2022-11-03 04:01:45,396 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 04:01:45,397 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 17 transitions. [2022-11-03 04:01:45,398 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-03 04:01:45,398 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 04:01:45,398 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 04:01:45,399 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-03 04:01:45,399 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 04:01:45,399 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 04:01:45,400 INFO L85 PathProgramCache]: Analyzing trace with hash -1862814498, now seen corresponding path program 1 times [2022-11-03 04:01:45,400 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 04:01:45,400 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1405516936] [2022-11-03 04:01:45,400 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 04:01:45,400 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 04:01:45,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 04:01:45,487 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 04:01:45,488 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 04:01:45,488 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1405516936] [2022-11-03 04:01:45,488 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1405516936] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 04:01:45,489 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 04:01:45,489 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-03 04:01:45,489 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1051432964] [2022-11-03 04:01:45,491 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 04:01:45,491 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 04:01:45,491 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 04:01:45,492 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 04:01:45,492 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-03 04:01:45,492 INFO L87 Difference]: Start difference. First operand 14 states and 17 transitions. Second operand has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 04:01:45,531 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 04:01:45,531 INFO L93 Difference]: Finished difference Result 23 states and 28 transitions. [2022-11-03 04:01:45,532 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 04:01:45,532 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2022-11-03 04:01:45,532 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 04:01:45,533 INFO L225 Difference]: With dead ends: 23 [2022-11-03 04:01:45,534 INFO L226 Difference]: Without dead ends: 15 [2022-11-03 04:01:45,535 INFO L412 NwaCegarLoop]: 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 [2022-11-03 04:01:45,536 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 0 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 16 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-03 04:01:45,537 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 11 Invalid, 16 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-03 04:01:45,538 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2022-11-03 04:01:45,539 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2022-11-03 04:01:45,540 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.2857142857142858) internal successors, (18), 14 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 04:01:45,540 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 18 transitions. [2022-11-03 04:01:45,540 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 18 transitions. Word has length 9 [2022-11-03 04:01:45,541 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 04:01:45,541 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 18 transitions. [2022-11-03 04:01:45,541 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 04:01:45,541 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 18 transitions. [2022-11-03 04:01:45,542 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-11-03 04:01:45,542 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 04:01:45,542 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 04:01:45,542 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-11-03 04:01:45,542 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 04:01:45,543 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 04:01:45,543 INFO L85 PathProgramCache]: Analyzing trace with hash -803583839, now seen corresponding path program 1 times [2022-11-03 04:01:45,543 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 04:01:45,543 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1425303262] [2022-11-03 04:01:45,544 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 04:01:45,544 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 04:01:45,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 04:01:45,612 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 04:01:45,612 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 04:01:45,613 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1425303262] [2022-11-03 04:01:45,613 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1425303262] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 04:01:45,613 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [668493813] [2022-11-03 04:01:45,613 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 04:01:45,613 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:01:45,614 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 04:01:45,615 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 04:01:45,640 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-03 04:01:45,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 04:01:45,693 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 6 conjunts are in the unsatisfiable core [2022-11-03 04:01:45,701 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 04:01:46,121 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 04:01:46,121 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 04:01:46,122 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [668493813] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 04:01:46,122 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-03 04:01:46,122 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [4] total 7 [2022-11-03 04:01:46,122 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [372742819] [2022-11-03 04:01:46,122 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 04:01:46,124 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-03 04:01:46,124 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 04:01:46,124 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-03 04:01:46,125 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-11-03 04:01:46,126 INFO L87 Difference]: Start difference. First operand 15 states and 18 transitions. Second operand has 5 states, 5 states have (on average 2.0) internal successors, (10), 5 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 04:01:46,250 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 04:01:46,250 INFO L93 Difference]: Finished difference Result 25 states and 27 transitions. [2022-11-03 04:01:46,250 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-03 04:01:46,251 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 5 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2022-11-03 04:01:46,251 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 04:01:46,252 INFO L225 Difference]: With dead ends: 25 [2022-11-03 04:01:46,252 INFO L226 Difference]: Without dead ends: 17 [2022-11-03 04:01:46,255 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2022-11-03 04:01:46,264 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 20 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 30 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-03 04:01:46,265 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 12 Invalid, 30 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-03 04:01:46,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2022-11-03 04:01:46,271 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 13. [2022-11-03 04:01:46,272 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.25) internal successors, (15), 12 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 04:01:46,273 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 15 transitions. [2022-11-03 04:01:46,273 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 15 transitions. Word has length 10 [2022-11-03 04:01:46,273 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 04:01:46,274 INFO L495 AbstractCegarLoop]: Abstraction has 13 states and 15 transitions. [2022-11-03 04:01:46,274 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 5 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 04:01:46,274 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 15 transitions. [2022-11-03 04:01:46,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-11-03 04:01:46,275 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 04:01:46,275 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 04:01:46,325 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-03 04:01:46,488 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:01:46,489 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 04:01:46,489 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 04:01:46,490 INFO L85 PathProgramCache]: Analyzing trace with hash -1928566110, now seen corresponding path program 1 times [2022-11-03 04:01:46,490 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 04:01:46,490 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1655485915] [2022-11-03 04:01:46,490 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 04:01:46,490 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 04:01:46,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 04:01:46,545 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 04:01:46,545 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 04:01:46,545 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1655485915] [2022-11-03 04:01:46,545 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1655485915] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 04:01:46,546 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1722646550] [2022-11-03 04:01:46,546 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 04:01:46,546 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:01:46,546 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 04:01:46,547 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 04:01:46,567 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-03 04:01:46,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 04:01:46,598 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-03 04:01:46,599 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 04:01:46,630 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 04:01:46,630 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 04:01:46,651 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 04:01:46,651 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1722646550] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 04:01:46,652 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [214933955] [2022-11-03 04:01:46,669 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-03 04:01:46,669 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 04:01:46,675 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 04:01:46,681 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 04:01:46,682 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 04:01:46,995 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 04:01:47,931 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '366#(and (< |ULTIMATE.start_student_version_~w#1| 4) (= |ULTIMATE.start_correct_version_~i~0#1| |ULTIMATE.start_correct_version_~w#1|) (<= 4 |ULTIMATE.start_correct_version_~w#1|) (= ~true~0 1) (<= |ULTIMATE.start_correct_version_~is_divisible~0#1| 1) (= |ULTIMATE.start_correct_version_#res#1| |ULTIMATE.start_main_~is_divisible1~0#1|) (<= 4 |ULTIMATE.start_correct_version_#in~w#1|) (= ~false~0 0) (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_#in~w#1|) (= |ULTIMATE.start_student_version_#in~w#1| (ite (<= (mod |ULTIMATE.start_main_~w~0#1| 4294967296) 2147483647) (mod |ULTIMATE.start_main_~w~0#1| 4294967296) (+ (mod |ULTIMATE.start_main_~w~0#1| 4294967296) (- 4294967296)))) (= |ULTIMATE.start_correct_version_#res#1| |ULTIMATE.start_correct_version_~is_divisible~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start_student_version_~is_divisible~1#1| ~false~0) (= |ULTIMATE.start_student_version_~is_divisible~1#1| |ULTIMATE.start_student_version_#res#1|) (<= 0 |#StackHeapBarrier|) (<= 1 |ULTIMATE.start_correct_version_~is_divisible~0#1|) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (= |#NULL.base| 0))' at error location [2022-11-03 04:01:47,931 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 04:01:47,931 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 04:01:47,931 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 8 [2022-11-03 04:01:47,932 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [519284137] [2022-11-03 04:01:47,932 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 04:01:47,932 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-03 04:01:47,932 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 04:01:47,933 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-03 04:01:47,933 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=195, Unknown=0, NotChecked=0, Total=240 [2022-11-03 04:01:47,933 INFO L87 Difference]: Start difference. First operand 13 states and 15 transitions. Second operand has 8 states, 8 states have (on average 2.0) internal successors, (16), 8 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) [2022-11-03 04:01:47,983 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 04:01:47,983 INFO L93 Difference]: Finished difference Result 22 states and 26 transitions. [2022-11-03 04:01:47,984 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-03 04:01:47,984 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.0) internal successors, (16), 8 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 10 [2022-11-03 04:01:47,984 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 04:01:47,985 INFO L225 Difference]: With dead ends: 22 [2022-11-03 04:01:47,985 INFO L226 Difference]: Without dead ends: 14 [2022-11-03 04:01:47,986 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 75 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=45, Invalid=195, Unknown=0, NotChecked=0, Total=240 [2022-11-03 04:01:47,986 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 0 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-03 04:01:47,987 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 26 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-03 04:01:47,988 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2022-11-03 04:01:47,992 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2022-11-03 04:01:47,993 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 13 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) [2022-11-03 04:01:47,994 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2022-11-03 04:01:47,994 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 10 [2022-11-03 04:01:47,994 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 04:01:47,994 INFO L495 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2022-11-03 04:01:47,994 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.0) internal successors, (16), 8 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) [2022-11-03 04:01:47,995 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2022-11-03 04:01:47,995 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-11-03 04:01:47,995 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 04:01:47,996 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 04:01:48,035 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-03 04:01:48,215 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:01:48,215 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 04:01:48,216 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 04:01:48,216 INFO L85 PathProgramCache]: Analyzing trace with hash 328101214, now seen corresponding path program 2 times [2022-11-03 04:01:48,216 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 04:01:48,216 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [902859456] [2022-11-03 04:01:48,216 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 04:01:48,216 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 04:01:48,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 04:01:48,367 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-03 04:01:48,368 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 04:01:48,368 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [902859456] [2022-11-03 04:01:48,368 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [902859456] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 04:01:48,368 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 04:01:48,368 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-11-03 04:01:48,368 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1232545089] [2022-11-03 04:01:48,368 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 04:01:48,369 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-03 04:01:48,369 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 04:01:48,369 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-03 04:01:48,369 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-11-03 04:01:48,370 INFO L87 Difference]: Start difference. First operand 14 states and 16 transitions. Second operand has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 6 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 04:01:48,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 04:01:48,404 INFO L93 Difference]: Finished difference Result 18 states and 19 transitions. [2022-11-03 04:01:48,404 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-03 04:01:48,404 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 6 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2022-11-03 04:01:48,404 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 04:01:48,405 INFO L225 Difference]: With dead ends: 18 [2022-11-03 04:01:48,405 INFO L226 Difference]: Without dead ends: 14 [2022-11-03 04:01:48,405 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2022-11-03 04:01:48,406 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 24 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 4 SdHoareTripleChecker+Invalid, 17 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-03 04:01:48,406 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [24 Valid, 4 Invalid, 17 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-03 04:01:48,407 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2022-11-03 04:01:48,411 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2022-11-03 04:01:48,411 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 13 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) [2022-11-03 04:01:48,412 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2022-11-03 04:01:48,412 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 11 [2022-11-03 04:01:48,412 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 04:01:48,412 INFO L495 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2022-11-03 04:01:48,413 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 6 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 04:01:48,413 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2022-11-03 04:01:48,413 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-03 04:01:48,413 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 04:01:48,413 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 04:01:48,413 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2022-11-03 04:01:48,414 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 04:01:48,414 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 04:01:48,414 INFO L85 PathProgramCache]: Analyzing trace with hash 1827995217, now seen corresponding path program 1 times [2022-11-03 04:01:48,414 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 04:01:48,414 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [703254196] [2022-11-03 04:01:48,415 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 04:01:48,415 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 04:01:48,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 04:01:48,457 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-03 04:01:48,457 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 04:01:48,457 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [703254196] [2022-11-03 04:01:48,457 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [703254196] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 04:01:48,458 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1266713353] [2022-11-03 04:01:48,458 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 04:01:48,458 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:01:48,458 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 04:01:48,459 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 04:01:48,515 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-03 04:01:48,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 04:01:48,576 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-03 04:01:48,577 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 04:01:48,603 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-03 04:01:48,603 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 04:01:48,621 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-03 04:01:48,622 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1266713353] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 04:01:48,622 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1259762415] [2022-11-03 04:01:48,624 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-03 04:01:48,631 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 04:01:48,631 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 04:01:48,631 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 04:01:48,631 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 04:01:48,844 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 04:01:49,789 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '563#(and (<= 4 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_correct_version_#res#1| 1) (<= 4 |ULTIMATE.start_student_version_~w#1|) (<= |ULTIMATE.start_main_~is_divisible1~0#1| 1) (<= 4 |ULTIMATE.start_correct_version_~w#1|) (<= 4 |ULTIMATE.start_student_version_#in~w#1|) (<= 0 |ULTIMATE.start_correct_version_~is_divisible~0#1|) (= ~true~0 1) (<= |ULTIMATE.start_correct_version_~is_divisible~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 4 |ULTIMATE.start_correct_version_#in~w#1|) (not (< |ULTIMATE.start_student_version_~i~1#1| |ULTIMATE.start_student_version_~w#1|)) (= ~false~0 0) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (or (and (not (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start_student_version_~is_divisible~1#1| ~false~0)) (and (<= 1 |ULTIMATE.start_student_version_~is_divisible~1#1|) (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|) (<= |ULTIMATE.start_student_version_~is_divisible~1#1| 1))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~is_divisible1~0#1|) (= |ULTIMATE.start_student_version_~is_divisible~1#1| |ULTIMATE.start_student_version_#res#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (= |#NULL.base| 0))' at error location [2022-11-03 04:01:49,789 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 04:01:49,789 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 04:01:49,789 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 8 [2022-11-03 04:01:49,789 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1205088989] [2022-11-03 04:01:49,790 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 04:01:49,790 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-03 04:01:49,790 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 04:01:49,790 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-03 04:01:49,791 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=225, Unknown=0, NotChecked=0, Total=272 [2022-11-03 04:01:49,791 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand has 8 states, 8 states have (on average 2.25) internal successors, (18), 8 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 04:01:49,814 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 04:01:49,815 INFO L93 Difference]: Finished difference Result 19 states and 20 transitions. [2022-11-03 04:01:49,815 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-03 04:01:49,815 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.25) internal successors, (18), 8 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2022-11-03 04:01:49,815 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 04:01:49,816 INFO L225 Difference]: With dead ends: 19 [2022-11-03 04:01:49,816 INFO L226 Difference]: Without dead ends: 15 [2022-11-03 04:01:49,816 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 84 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=47, Invalid=225, Unknown=0, NotChecked=0, Total=272 [2022-11-03 04:01:49,817 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 0 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 20 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-03 04:01:49,817 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 9 Invalid, 20 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-03 04:01:49,818 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2022-11-03 04:01:49,822 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2022-11-03 04:01:49,823 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 14 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 04:01:49,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2022-11-03 04:01:49,831 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 13 [2022-11-03 04:01:49,831 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 04:01:49,831 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2022-11-03 04:01:49,831 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.25) internal successors, (18), 8 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 04:01:49,832 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2022-11-03 04:01:49,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-11-03 04:01:49,832 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 04:01:49,833 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 04:01:49,872 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-03 04:01:50,055 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:01:50,055 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 04:01:50,056 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 04:01:50,056 INFO L85 PathProgramCache]: Analyzing trace with hash 823375698, now seen corresponding path program 2 times [2022-11-03 04:01:50,056 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 04:01:50,056 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1750827853] [2022-11-03 04:01:50,056 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 04:01:50,056 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 04:01:50,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 04:01:50,373 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 04:01:50,373 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 04:01:50,373 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1750827853] [2022-11-03 04:01:50,373 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1750827853] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 04:01:50,374 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [4390344] [2022-11-03 04:01:50,374 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 04:01:50,374 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:01:50,374 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 04:01:50,375 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 04:01:50,384 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-03 04:01:50,439 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-03 04:01:50,439 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 04:01:50,455 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 27 conjunts are in the unsatisfiable core [2022-11-03 04:01:50,457 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 04:01:50,667 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 04:01:50,667 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 04:01:51,002 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 04:01:51,003 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [4390344] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 04:01:51,003 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2004058863] [2022-11-03 04:01:51,005 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-03 04:01:51,005 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 04:01:51,005 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 04:01:51,005 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 04:01:51,006 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 04:01:51,194 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 04:01:52,161 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '725#(and (<= 4 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_correct_version_#res#1| 1) (<= 4 |ULTIMATE.start_student_version_~w#1|) (<= |ULTIMATE.start_main_~is_divisible1~0#1| 1) (<= 4 |ULTIMATE.start_correct_version_~w#1|) (<= 4 |ULTIMATE.start_student_version_#in~w#1|) (<= 0 |ULTIMATE.start_correct_version_~is_divisible~0#1|) (= ~true~0 1) (<= |ULTIMATE.start_correct_version_~is_divisible~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 4 |ULTIMATE.start_correct_version_#in~w#1|) (not (< |ULTIMATE.start_student_version_~i~1#1| |ULTIMATE.start_student_version_~w#1|)) (= ~false~0 0) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (or (and (not (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start_student_version_~is_divisible~1#1| ~false~0)) (and (<= 1 |ULTIMATE.start_student_version_~is_divisible~1#1|) (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|) (<= |ULTIMATE.start_student_version_~is_divisible~1#1| 1))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~is_divisible1~0#1|) (= |ULTIMATE.start_student_version_~is_divisible~1#1| |ULTIMATE.start_student_version_#res#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (= |#NULL.base| 0))' at error location [2022-11-03 04:01:52,161 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 04:01:52,161 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 04:01:52,162 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 24 [2022-11-03 04:01:52,162 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [591297784] [2022-11-03 04:01:52,162 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 04:01:52,162 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-11-03 04:01:52,162 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 04:01:52,163 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-11-03 04:01:52,163 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=918, Unknown=0, NotChecked=0, Total=1056 [2022-11-03 04:01:52,163 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand has 24 states, 24 states have (on average 1.3333333333333333) internal successors, (32), 24 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 04:01:52,410 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 04:01:52,410 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2022-11-03 04:01:52,411 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-03 04:01:52,411 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.3333333333333333) internal successors, (32), 24 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2022-11-03 04:01:52,411 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 04:01:52,412 INFO L225 Difference]: With dead ends: 30 [2022-11-03 04:01:52,412 INFO L226 Difference]: Without dead ends: 26 [2022-11-03 04:01:52,413 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 21 SyntacticMatches, 1 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 621 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=204, Invalid=1202, Unknown=0, NotChecked=0, Total=1406 [2022-11-03 04:01:52,413 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 11 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 113 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 47 SdHoareTripleChecker+Invalid, 136 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 113 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 04:01:52,414 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 47 Invalid, 136 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 113 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 04:01:52,414 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2022-11-03 04:01:52,421 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 19. [2022-11-03 04:01:52,422 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 18 states have (on average 1.1666666666666667) internal successors, (21), 18 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 04:01:52,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2022-11-03 04:01:52,422 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 14 [2022-11-03 04:01:52,423 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 04:01:52,423 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2022-11-03 04:01:52,423 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 1.3333333333333333) internal successors, (32), 24 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 04:01:52,423 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2022-11-03 04:01:52,424 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-11-03 04:01:52,424 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 04:01:52,424 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 04:01:52,468 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-03 04:01:52,624 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:01:52,624 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 04:01:52,625 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 04:01:52,625 INFO L85 PathProgramCache]: Analyzing trace with hash -255058319, now seen corresponding path program 3 times [2022-11-03 04:01:52,625 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 04:01:52,625 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [596410555] [2022-11-03 04:01:52,625 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 04:01:52,626 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 04:01:52,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 04:01:52,894 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 04:01:52,895 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 04:01:52,895 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [596410555] [2022-11-03 04:01:52,895 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [596410555] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 04:01:52,895 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1140074356] [2022-11-03 04:01:52,895 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 04:01:52,895 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:01:52,895 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 04:01:52,899 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 04:01:52,931 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-03 04:01:52,957 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 04:01:52,958 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 04:01:52,959 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-03 04:01:52,960 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 04:01:53,272 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 04:01:53,273 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 04:01:53,529 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 04:01:53,529 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1140074356] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 04:01:53,529 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [582228644] [2022-11-03 04:01:53,532 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-03 04:01:53,532 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 04:01:53,532 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 04:01:53,533 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 04:01:53,533 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 04:01:53,748 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 04:01:54,787 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '927#(and (<= 4 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_correct_version_#res#1| 1) (<= 4 |ULTIMATE.start_student_version_~w#1|) (<= |ULTIMATE.start_main_~is_divisible1~0#1| 1) (<= 4 |ULTIMATE.start_correct_version_~w#1|) (<= 4 |ULTIMATE.start_student_version_#in~w#1|) (<= 0 |ULTIMATE.start_correct_version_~is_divisible~0#1|) (= ~true~0 1) (<= |ULTIMATE.start_correct_version_~is_divisible~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 4 |ULTIMATE.start_correct_version_#in~w#1|) (not (< |ULTIMATE.start_student_version_~i~1#1| |ULTIMATE.start_student_version_~w#1|)) (= ~false~0 0) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (or (and (not (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start_student_version_~is_divisible~1#1| ~false~0)) (and (<= 1 |ULTIMATE.start_student_version_~is_divisible~1#1|) (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|) (<= |ULTIMATE.start_student_version_~is_divisible~1#1| 1))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~is_divisible1~0#1|) (= |ULTIMATE.start_student_version_~is_divisible~1#1| |ULTIMATE.start_student_version_#res#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (= |#NULL.base| 0))' at error location [2022-11-03 04:01:54,788 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 04:01:54,788 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 04:01:54,788 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 23 [2022-11-03 04:01:54,788 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [426716317] [2022-11-03 04:01:54,788 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 04:01:54,789 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-11-03 04:01:54,789 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 04:01:54,789 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-11-03 04:01:54,790 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=850, Unknown=0, NotChecked=0, Total=992 [2022-11-03 04:01:54,790 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand has 23 states, 23 states have (on average 1.3478260869565217) internal successors, (31), 23 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 04:01:55,138 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 04:01:55,138 INFO L93 Difference]: Finished difference Result 26 states and 28 transitions. [2022-11-03 04:01:55,138 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-03 04:01:55,139 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.3478260869565217) internal successors, (31), 23 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2022-11-03 04:01:55,139 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 04:01:55,139 INFO L225 Difference]: With dead ends: 26 [2022-11-03 04:01:55,139 INFO L226 Difference]: Without dead ends: 16 [2022-11-03 04:01:55,140 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 19 SyntacticMatches, 5 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 522 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=231, Invalid=1175, Unknown=0, NotChecked=0, Total=1406 [2022-11-03 04:01:55,140 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 33 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 63 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 86 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 63 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 04:01:55,141 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [33 Valid, 12 Invalid, 86 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 63 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 04:01:55,141 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2022-11-03 04:01:55,147 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2022-11-03 04:01:55,148 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 15 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 04:01:55,148 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2022-11-03 04:01:55,148 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 15 [2022-11-03 04:01:55,148 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 04:01:55,149 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2022-11-03 04:01:55,149 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.3478260869565217) internal successors, (31), 23 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 04:01:55,149 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2022-11-03 04:01:55,149 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-11-03 04:01:55,150 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 04:01:55,150 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 04:01:55,187 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-03 04:01:55,350 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2022-11-03 04:01:55,350 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 04:01:55,351 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 04:01:55,351 INFO L85 PathProgramCache]: Analyzing trace with hash -853672946, now seen corresponding path program 4 times [2022-11-03 04:01:55,351 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 04:01:55,351 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [407989250] [2022-11-03 04:01:55,351 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 04:01:55,351 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 04:01:55,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 04:01:55,660 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 04:01:55,660 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 04:01:55,660 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [407989250] [2022-11-03 04:01:55,660 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [407989250] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 04:01:55,660 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1190851481] [2022-11-03 04:01:55,661 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 04:01:55,661 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:01:55,661 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 04:01:55,663 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 04:01:55,671 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-03 04:01:55,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 04:01:55,712 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-03 04:01:55,714 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 04:01:56,057 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 04:01:56,057 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 04:01:56,318 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 04:01:56,318 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1190851481] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 04:01:56,319 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [823589569] [2022-11-03 04:01:56,321 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-03 04:01:56,321 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 04:01:56,321 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 04:01:56,321 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 04:01:56,321 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 04:01:56,485 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 04:01:57,488 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1122#(and (<= 4 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_correct_version_#res#1| 1) (<= 4 |ULTIMATE.start_student_version_~w#1|) (<= |ULTIMATE.start_main_~is_divisible1~0#1| 1) (<= 4 |ULTIMATE.start_correct_version_~w#1|) (<= 4 |ULTIMATE.start_student_version_#in~w#1|) (<= 0 |ULTIMATE.start_correct_version_~is_divisible~0#1|) (= ~true~0 1) (<= |ULTIMATE.start_correct_version_~is_divisible~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 4 |ULTIMATE.start_correct_version_#in~w#1|) (not (< |ULTIMATE.start_student_version_~i~1#1| |ULTIMATE.start_student_version_~w#1|)) (= ~false~0 0) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (or (and (not (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start_student_version_~is_divisible~1#1| ~false~0)) (and (<= 1 |ULTIMATE.start_student_version_~is_divisible~1#1|) (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|) (<= |ULTIMATE.start_student_version_~is_divisible~1#1| 1))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~is_divisible1~0#1|) (= |ULTIMATE.start_student_version_~is_divisible~1#1| |ULTIMATE.start_student_version_#res#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (= |#NULL.base| 0))' at error location [2022-11-03 04:01:57,488 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 04:01:57,488 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 04:01:57,489 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11, 11] total 24 [2022-11-03 04:01:57,489 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1229309853] [2022-11-03 04:01:57,489 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 04:01:57,489 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-11-03 04:01:57,489 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 04:01:57,490 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-11-03 04:01:57,490 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=150, Invalid=906, Unknown=0, NotChecked=0, Total=1056 [2022-11-03 04:01:57,491 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand has 24 states, 24 states have (on average 1.3333333333333333) internal successors, (32), 24 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 04:01:57,827 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 04:01:57,827 INFO L93 Difference]: Finished difference Result 21 states and 22 transitions. [2022-11-03 04:01:57,829 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-03 04:01:57,829 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.3333333333333333) internal successors, (32), 24 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2022-11-03 04:01:57,830 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 04:01:57,830 INFO L225 Difference]: With dead ends: 21 [2022-11-03 04:01:57,830 INFO L226 Difference]: Without dead ends: 17 [2022-11-03 04:01:57,831 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 19 SyntacticMatches, 5 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 562 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=252, Invalid=1154, Unknown=0, NotChecked=0, Total=1406 [2022-11-03 04:01:57,831 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 45 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 73 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 98 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 73 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 04:01:57,832 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [45 Valid, 12 Invalid, 98 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 73 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 04:01:57,832 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2022-11-03 04:01:57,838 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2022-11-03 04:01:57,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 16 states have (on average 1.125) internal successors, (18), 16 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 04:01:57,842 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2022-11-03 04:01:57,843 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 15 [2022-11-03 04:01:57,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 04:01:57,843 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2022-11-03 04:01:57,843 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 1.3333333333333333) internal successors, (32), 24 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 04:01:57,843 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2022-11-03 04:01:57,844 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-11-03 04:01:57,844 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 04:01:57,844 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 04:01:57,869 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-03 04:01:58,044 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-11-03 04:01:58,045 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 04:01:58,045 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 04:01:58,045 INFO L85 PathProgramCache]: Analyzing trace with hash -703958731, now seen corresponding path program 5 times [2022-11-03 04:01:58,045 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 04:01:58,045 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [405662283] [2022-11-03 04:01:58,045 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 04:01:58,045 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 04:01:58,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 04:01:58,652 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 04:01:58,652 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 04:01:58,652 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [405662283] [2022-11-03 04:01:58,652 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [405662283] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 04:01:58,652 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1873837825] [2022-11-03 04:01:58,652 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 04:01:58,652 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:01:58,653 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 04:01:58,655 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 04:01:58,679 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-03 04:01:58,711 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-03 04:01:58,711 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 04:01:58,713 WARN L261 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 47 conjunts are in the unsatisfiable core [2022-11-03 04:01:58,715 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 04:02:00,096 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 04:02:00,096 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 04:02:01,297 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 04:02:01,299 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1873837825] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 04:02:01,300 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [408396190] [2022-11-03 04:02:01,304 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-03 04:02:01,304 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 04:02:01,305 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 04:02:01,305 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 04:02:01,305 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 04:02:01,474 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 04:02:02,777 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1330#(and (<= 4 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_correct_version_#res#1| 1) (<= 4 |ULTIMATE.start_student_version_~w#1|) (<= |ULTIMATE.start_main_~is_divisible1~0#1| 1) (<= 4 |ULTIMATE.start_correct_version_~w#1|) (<= 4 |ULTIMATE.start_student_version_#in~w#1|) (<= 0 |ULTIMATE.start_correct_version_~is_divisible~0#1|) (= ~true~0 1) (<= |ULTIMATE.start_correct_version_~is_divisible~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 4 |ULTIMATE.start_correct_version_#in~w#1|) (not (< |ULTIMATE.start_student_version_~i~1#1| |ULTIMATE.start_student_version_~w#1|)) (= ~false~0 0) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (or (and (not (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start_student_version_~is_divisible~1#1| ~false~0)) (and (<= 1 |ULTIMATE.start_student_version_~is_divisible~1#1|) (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|) (<= |ULTIMATE.start_student_version_~is_divisible~1#1| 1))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~is_divisible1~0#1|) (= |ULTIMATE.start_student_version_~is_divisible~1#1| |ULTIMATE.start_student_version_#res#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (= |#NULL.base| 0))' at error location [2022-11-03 04:02:02,777 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 04:02:02,777 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 04:02:02,777 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 40 [2022-11-03 04:02:02,777 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [176815267] [2022-11-03 04:02:02,777 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 04:02:02,778 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-11-03 04:02:02,778 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 04:02:02,778 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-11-03 04:02:02,779 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=2168, Unknown=0, NotChecked=0, Total=2352 [2022-11-03 04:02:02,780 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand has 40 states, 40 states have (on average 1.1) internal successors, (44), 40 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 04:02:09,533 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 04:02:09,533 INFO L93 Difference]: Finished difference Result 61 states and 70 transitions. [2022-11-03 04:02:09,533 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2022-11-03 04:02:09,533 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.1) internal successors, (44), 40 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2022-11-03 04:02:09,534 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 04:02:09,534 INFO L225 Difference]: With dead ends: 61 [2022-11-03 04:02:09,534 INFO L226 Difference]: Without dead ends: 44 [2022-11-03 04:02:09,537 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1747 ImplicationChecksByTransitivity, 9.2s TimeCoverageRelationStatistics Valid=678, Invalid=5964, Unknown=0, NotChecked=0, Total=6642 [2022-11-03 04:02:09,538 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 128 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 409 mSolverCounterSat, 188 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 128 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 597 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 188 IncrementalHoareTripleChecker+Valid, 409 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-03 04:02:09,538 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [128 Valid, 43 Invalid, 597 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [188 Valid, 409 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-03 04:02:09,538 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-11-03 04:02:09,552 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 25. [2022-11-03 04:02:09,552 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 24 states have (on average 1.25) internal successors, (30), 24 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) [2022-11-03 04:02:09,553 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 30 transitions. [2022-11-03 04:02:09,553 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 30 transitions. Word has length 16 [2022-11-03 04:02:09,553 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 04:02:09,553 INFO L495 AbstractCegarLoop]: Abstraction has 25 states and 30 transitions. [2022-11-03 04:02:09,554 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 1.1) internal successors, (44), 40 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 04:02:09,554 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 30 transitions. [2022-11-03 04:02:09,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-11-03 04:02:09,554 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 04:02:09,554 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 04:02:09,587 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2022-11-03 04:02:09,771 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:02:09,771 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 04:02:09,771 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 04:02:09,771 INFO L85 PathProgramCache]: Analyzing trace with hash 2040615602, now seen corresponding path program 6 times [2022-11-03 04:02:09,772 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 04:02:09,772 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1340842029] [2022-11-03 04:02:09,772 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 04:02:09,772 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 04:02:09,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 04:02:10,551 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 04:02:10,551 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 04:02:10,552 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1340842029] [2022-11-03 04:02:10,552 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1340842029] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 04:02:10,552 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [856218212] [2022-11-03 04:02:10,552 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 04:02:10,552 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:02:10,552 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 04:02:10,553 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 04:02:10,555 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-03 04:02:10,600 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 04:02:10,600 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 04:02:10,601 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 49 conjunts are in the unsatisfiable core [2022-11-03 04:02:10,603 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 04:02:12,014 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 04:02:12,015 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 04:02:13,112 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 04:02:13,112 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [856218212] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 04:02:13,112 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1063538231] [2022-11-03 04:02:13,115 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-03 04:02:13,115 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 04:02:13,115 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 04:02:13,116 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 04:02:13,116 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 04:02:13,260 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 04:02:14,594 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1694#(and (<= 4 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_correct_version_#res#1| 1) (<= 4 |ULTIMATE.start_student_version_~w#1|) (<= |ULTIMATE.start_main_~is_divisible1~0#1| 1) (<= 4 |ULTIMATE.start_correct_version_~w#1|) (<= 4 |ULTIMATE.start_student_version_#in~w#1|) (<= 0 |ULTIMATE.start_correct_version_~is_divisible~0#1|) (= ~true~0 1) (<= |ULTIMATE.start_correct_version_~is_divisible~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 4 |ULTIMATE.start_correct_version_#in~w#1|) (not (< |ULTIMATE.start_student_version_~i~1#1| |ULTIMATE.start_student_version_~w#1|)) (= ~false~0 0) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (or (and (not (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start_student_version_~is_divisible~1#1| ~false~0)) (and (<= 1 |ULTIMATE.start_student_version_~is_divisible~1#1|) (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|) (<= |ULTIMATE.start_student_version_~is_divisible~1#1| 1))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~is_divisible1~0#1|) (= |ULTIMATE.start_student_version_~is_divisible~1#1| |ULTIMATE.start_student_version_#res#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (= |#NULL.base| 0))' at error location [2022-11-03 04:02:14,594 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 04:02:14,594 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 04:02:14,594 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 45 [2022-11-03 04:02:14,594 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1819646120] [2022-11-03 04:02:14,595 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 04:02:14,595 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2022-11-03 04:02:14,595 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 04:02:14,596 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2022-11-03 04:02:14,597 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=208, Invalid=2654, Unknown=0, NotChecked=0, Total=2862 [2022-11-03 04:02:14,597 INFO L87 Difference]: Start difference. First operand 25 states and 30 transitions. Second operand has 45 states, 45 states have (on average 1.0888888888888888) internal successors, (49), 45 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 04:02:25,013 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 04:02:25,013 INFO L93 Difference]: Finished difference Result 80 states and 90 transitions. [2022-11-03 04:02:25,014 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2022-11-03 04:02:25,014 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 1.0888888888888888) internal successors, (49), 45 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2022-11-03 04:02:25,014 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 04:02:25,017 INFO L225 Difference]: With dead ends: 80 [2022-11-03 04:02:25,017 INFO L226 Difference]: Without dead ends: 62 [2022-11-03 04:02:25,020 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2310 ImplicationChecksByTransitivity, 12.9s TimeCoverageRelationStatistics Valid=818, Invalid=7738, Unknown=0, NotChecked=0, Total=8556 [2022-11-03 04:02:25,020 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 167 mSDsluCounter, 80 mSDsCounter, 0 mSdLazyCounter, 601 mSolverCounterSat, 215 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 167 SdHoareTripleChecker+Valid, 77 SdHoareTripleChecker+Invalid, 816 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 215 IncrementalHoareTripleChecker+Valid, 601 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-03 04:02:25,021 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [167 Valid, 77 Invalid, 816 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [215 Valid, 601 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-03 04:02:25,021 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2022-11-03 04:02:25,059 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 34. [2022-11-03 04:02:25,060 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 33 states have (on average 1.2424242424242424) internal successors, (41), 33 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) [2022-11-03 04:02:25,064 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 41 transitions. [2022-11-03 04:02:25,064 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 41 transitions. Word has length 18 [2022-11-03 04:02:25,066 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 04:02:25,067 INFO L495 AbstractCegarLoop]: Abstraction has 34 states and 41 transitions. [2022-11-03 04:02:25,067 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 1.0888888888888888) internal successors, (49), 45 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 04:02:25,067 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 41 transitions. [2022-11-03 04:02:25,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-11-03 04:02:25,068 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 04:02:25,068 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 04:02:25,111 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-03 04:02:25,283 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:02:25,283 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 04:02:25,283 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 04:02:25,283 INFO L85 PathProgramCache]: Analyzing trace with hash 1585528789, now seen corresponding path program 7 times [2022-11-03 04:02:25,284 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 04:02:25,284 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [188658967] [2022-11-03 04:02:25,284 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 04:02:25,284 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 04:02:25,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 04:02:26,130 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 04:02:26,130 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 04:02:26,130 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [188658967] [2022-11-03 04:02:26,130 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [188658967] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 04:02:26,131 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1061307487] [2022-11-03 04:02:26,131 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 04:02:26,131 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:02:26,131 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 04:02:26,132 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 04:02:26,133 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-03 04:02:26,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 04:02:26,175 WARN L261 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 53 conjunts are in the unsatisfiable core [2022-11-03 04:02:26,177 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 04:02:27,793 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 04:02:27,794 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 04:02:29,093 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 04:02:29,094 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1061307487] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 04:02:29,094 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [180477302] [2022-11-03 04:02:29,096 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-03 04:02:29,096 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 04:02:29,096 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 04:02:29,096 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 04:02:29,096 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 04:02:29,245 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 04:02:30,664 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2136#(and (<= 4 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_correct_version_#res#1| 1) (<= 4 |ULTIMATE.start_student_version_~w#1|) (<= |ULTIMATE.start_main_~is_divisible1~0#1| 1) (<= 4 |ULTIMATE.start_correct_version_~w#1|) (<= 4 |ULTIMATE.start_student_version_#in~w#1|) (<= 0 |ULTIMATE.start_correct_version_~is_divisible~0#1|) (= ~true~0 1) (<= |ULTIMATE.start_correct_version_~is_divisible~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 4 |ULTIMATE.start_correct_version_#in~w#1|) (not (< |ULTIMATE.start_student_version_~i~1#1| |ULTIMATE.start_student_version_~w#1|)) (= ~false~0 0) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (or (and (not (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start_student_version_~is_divisible~1#1| ~false~0)) (and (<= 1 |ULTIMATE.start_student_version_~is_divisible~1#1|) (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|) (<= |ULTIMATE.start_student_version_~is_divisible~1#1| 1))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~is_divisible1~0#1|) (= |ULTIMATE.start_student_version_~is_divisible~1#1| |ULTIMATE.start_student_version_#res#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (= |#NULL.base| 0))' at error location [2022-11-03 04:02:30,664 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 04:02:30,664 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 04:02:30,664 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 51 [2022-11-03 04:02:30,665 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1683771509] [2022-11-03 04:02:30,665 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 04:02:30,665 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2022-11-03 04:02:30,665 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 04:02:30,666 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2022-11-03 04:02:30,667 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=235, Invalid=3305, Unknown=0, NotChecked=0, Total=3540 [2022-11-03 04:02:30,667 INFO L87 Difference]: Start difference. First operand 34 states and 41 transitions. Second operand has 51 states, 51 states have (on average 1.0784313725490196) internal successors, (55), 51 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 04:02:43,277 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 04:02:43,277 INFO L93 Difference]: Finished difference Result 92 states and 106 transitions. [2022-11-03 04:02:43,278 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2022-11-03 04:02:43,278 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 1.0784313725490196) internal successors, (55), 51 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2022-11-03 04:02:43,278 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 04:02:43,279 INFO L225 Difference]: With dead ends: 92 [2022-11-03 04:02:43,279 INFO L226 Difference]: Without dead ends: 73 [2022-11-03 04:02:43,283 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 17 SyntacticMatches, 2 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2889 ImplicationChecksByTransitivity, 15.4s TimeCoverageRelationStatistics Valid=930, Invalid=9576, Unknown=0, NotChecked=0, Total=10506 [2022-11-03 04:02:43,283 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 212 mSDsluCounter, 74 mSDsCounter, 0 mSdLazyCounter, 778 mSolverCounterSat, 290 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 212 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 1068 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 290 IncrementalHoareTripleChecker+Valid, 778 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-03 04:02:43,284 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [212 Valid, 70 Invalid, 1068 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [290 Valid, 778 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-11-03 04:02:43,284 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2022-11-03 04:02:43,319 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 44. [2022-11-03 04:02:43,320 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 43 states have (on average 1.255813953488372) internal successors, (54), 43 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 04:02:43,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 54 transitions. [2022-11-03 04:02:43,320 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 54 transitions. Word has length 20 [2022-11-03 04:02:43,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 04:02:43,321 INFO L495 AbstractCegarLoop]: Abstraction has 44 states and 54 transitions. [2022-11-03 04:02:43,321 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 1.0784313725490196) internal successors, (55), 51 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 04:02:43,321 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 54 transitions. [2022-11-03 04:02:43,321 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-11-03 04:02:43,322 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 04:02:43,322 INFO L195 NwaCegarLoop]: trace histogram [8, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 04:02:43,346 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-03 04:02:43,523 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-11-03 04:02:43,523 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 04:02:43,523 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 04:02:43,524 INFO L85 PathProgramCache]: Analyzing trace with hash 152487921, now seen corresponding path program 8 times [2022-11-03 04:02:43,524 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 04:02:43,524 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1883063487] [2022-11-03 04:02:43,524 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 04:02:43,524 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 04:02:43,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 04:02:44,148 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 21 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 04:02:44,148 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 04:02:44,148 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1883063487] [2022-11-03 04:02:44,148 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1883063487] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 04:02:44,148 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [386849567] [2022-11-03 04:02:44,149 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 04:02:44,149 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:02:44,149 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 04:02:44,150 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 04:02:44,157 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-03 04:02:44,224 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-11-03 04:02:44,224 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 04:02:44,225 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 14 conjunts are in the unsatisfiable core [2022-11-03 04:02:44,226 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 04:02:44,568 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 6 proven. 26 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-03 04:02:44,568 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 04:02:44,876 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 26 proven. 6 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-03 04:02:44,876 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [386849567] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 04:02:44,876 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1201967023] [2022-11-03 04:02:44,878 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-03 04:02:44,878 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 04:02:44,878 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 04:02:44,878 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 04:02:44,879 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 04:02:45,022 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 04:02:46,024 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2621#(and (<= 4 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_correct_version_#res#1| 1) (<= 4 |ULTIMATE.start_student_version_~w#1|) (<= |ULTIMATE.start_main_~is_divisible1~0#1| 1) (<= 4 |ULTIMATE.start_correct_version_~w#1|) (<= 4 |ULTIMATE.start_student_version_#in~w#1|) (<= 0 |ULTIMATE.start_correct_version_~is_divisible~0#1|) (= ~true~0 1) (<= |ULTIMATE.start_correct_version_~is_divisible~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 4 |ULTIMATE.start_correct_version_#in~w#1|) (not (< |ULTIMATE.start_student_version_~i~1#1| |ULTIMATE.start_student_version_~w#1|)) (= ~false~0 0) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (or (and (not (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start_student_version_~is_divisible~1#1| ~false~0)) (and (<= 1 |ULTIMATE.start_student_version_~is_divisible~1#1|) (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|) (<= |ULTIMATE.start_student_version_~is_divisible~1#1| 1))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~is_divisible1~0#1|) (= |ULTIMATE.start_student_version_~is_divisible~1#1| |ULTIMATE.start_student_version_#res#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (= |#NULL.base| 0))' at error location [2022-11-03 04:02:46,024 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 04:02:46,024 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 04:02:46,024 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 13, 13] total 38 [2022-11-03 04:02:46,024 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1987433370] [2022-11-03 04:02:46,025 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 04:02:46,025 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-11-03 04:02:46,025 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 04:02:46,025 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-11-03 04:02:46,026 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=309, Invalid=1853, Unknown=0, NotChecked=0, Total=2162 [2022-11-03 04:02:46,026 INFO L87 Difference]: Start difference. First operand 44 states and 54 transitions. Second operand has 38 states, 38 states have (on average 1.2105263157894737) internal successors, (46), 38 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 04:02:47,652 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 04:02:47,652 INFO L93 Difference]: Finished difference Result 76 states and 90 transitions. [2022-11-03 04:02:47,653 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-11-03 04:02:47,653 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.2105263157894737) internal successors, (46), 38 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2022-11-03 04:02:47,653 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 04:02:47,654 INFO L225 Difference]: With dead ends: 76 [2022-11-03 04:02:47,654 INFO L226 Difference]: Without dead ends: 72 [2022-11-03 04:02:47,655 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 32 SyntacticMatches, 2 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1371 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=1135, Invalid=3835, Unknown=0, NotChecked=0, Total=4970 [2022-11-03 04:02:47,656 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 82 mSDsluCounter, 61 mSDsCounter, 0 mSdLazyCounter, 247 mSolverCounterSat, 70 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 82 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 317 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 70 IncrementalHoareTripleChecker+Valid, 247 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 04:02:47,656 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [82 Valid, 46 Invalid, 317 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [70 Valid, 247 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-03 04:02:47,657 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2022-11-03 04:02:47,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 29. [2022-11-03 04:02:47,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 28 states have (on average 1.1428571428571428) internal successors, (32), 28 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 04:02:47,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 32 transitions. [2022-11-03 04:02:47,684 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 32 transitions. Word has length 21 [2022-11-03 04:02:47,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 04:02:47,685 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 32 transitions. [2022-11-03 04:02:47,685 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 1.2105263157894737) internal successors, (46), 38 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 04:02:47,685 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 32 transitions. [2022-11-03 04:02:47,686 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-11-03 04:02:47,686 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 04:02:47,686 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 04:02:47,712 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-03 04:02:47,891 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-11-03 04:02:47,891 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 04:02:47,891 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 04:02:47,891 INFO L85 PathProgramCache]: Analyzing trace with hash 789435922, now seen corresponding path program 9 times [2022-11-03 04:02:47,892 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 04:02:47,892 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1872419680] [2022-11-03 04:02:47,892 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 04:02:47,892 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 04:02:47,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 04:02:48,882 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 04:02:48,883 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 04:02:48,883 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1872419680] [2022-11-03 04:02:48,883 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1872419680] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 04:02:48,883 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [610462221] [2022-11-03 04:02:48,883 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 04:02:48,883 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:02:48,883 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 04:02:48,884 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 04:02:48,886 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-03 04:02:48,934 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 04:02:48,935 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 04:02:48,936 WARN L261 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 57 conjunts are in the unsatisfiable core [2022-11-03 04:02:48,938 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 04:02:50,816 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 04:02:50,816 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 04:02:52,393 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 04:02:52,394 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [610462221] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 04:02:52,394 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1273569982] [2022-11-03 04:02:52,395 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-03 04:02:52,396 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 04:02:52,396 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 04:02:52,396 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 04:02:52,396 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 04:02:52,552 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 04:02:54,125 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3043#(and (<= 4 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_correct_version_#res#1| 1) (<= 4 |ULTIMATE.start_student_version_~w#1|) (<= |ULTIMATE.start_main_~is_divisible1~0#1| 1) (<= 4 |ULTIMATE.start_correct_version_~w#1|) (<= 4 |ULTIMATE.start_student_version_#in~w#1|) (<= 0 |ULTIMATE.start_correct_version_~is_divisible~0#1|) (= ~true~0 1) (<= |ULTIMATE.start_correct_version_~is_divisible~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 4 |ULTIMATE.start_correct_version_#in~w#1|) (not (< |ULTIMATE.start_student_version_~i~1#1| |ULTIMATE.start_student_version_~w#1|)) (= ~false~0 0) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (or (and (not (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start_student_version_~is_divisible~1#1| ~false~0)) (and (<= 1 |ULTIMATE.start_student_version_~is_divisible~1#1|) (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|) (<= |ULTIMATE.start_student_version_~is_divisible~1#1| 1))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~is_divisible1~0#1|) (= |ULTIMATE.start_student_version_~is_divisible~1#1| |ULTIMATE.start_student_version_#res#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (= |#NULL.base| 0))' at error location [2022-11-03 04:02:54,125 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 04:02:54,125 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 04:02:54,126 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 57 [2022-11-03 04:02:54,126 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1395270547] [2022-11-03 04:02:54,126 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 04:02:54,126 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 57 states [2022-11-03 04:02:54,127 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 04:02:54,127 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2022-11-03 04:02:54,129 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=262, Invalid=4028, Unknown=0, NotChecked=0, Total=4290 [2022-11-03 04:02:54,129 INFO L87 Difference]: Start difference. First operand 29 states and 32 transitions. Second operand has 57 states, 57 states have (on average 1.0701754385964912) internal successors, (61), 57 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 04:03:08,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 04:03:08,487 INFO L93 Difference]: Finished difference Result 90 states and 101 transitions. [2022-11-03 04:03:08,491 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2022-11-03 04:03:08,491 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 57 states have (on average 1.0701754385964912) internal successors, (61), 57 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2022-11-03 04:03:08,491 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 04:03:08,493 INFO L225 Difference]: With dead ends: 90 [2022-11-03 04:03:08,493 INFO L226 Difference]: Without dead ends: 72 [2022-11-03 04:03:08,496 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3236 ImplicationChecksByTransitivity, 17.7s TimeCoverageRelationStatistics Valid=946, Invalid=10826, Unknown=0, NotChecked=0, Total=11772 [2022-11-03 04:03:08,496 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 129 mSDsluCounter, 84 mSDsCounter, 0 mSdLazyCounter, 991 mSolverCounterSat, 276 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 129 SdHoareTripleChecker+Valid, 79 SdHoareTripleChecker+Invalid, 1267 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 276 IncrementalHoareTripleChecker+Valid, 991 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-11-03 04:03:08,497 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [129 Valid, 79 Invalid, 1267 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [276 Valid, 991 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-11-03 04:03:08,497 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2022-11-03 04:03:08,524 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 29. [2022-11-03 04:03:08,524 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 28 states have (on average 1.1071428571428572) internal successors, (31), 28 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 04:03:08,525 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2022-11-03 04:03:08,525 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 22 [2022-11-03 04:03:08,525 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 04:03:08,525 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2022-11-03 04:03:08,525 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 57 states, 57 states have (on average 1.0701754385964912) internal successors, (61), 57 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 04:03:08,525 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2022-11-03 04:03:08,526 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-11-03 04:03:08,526 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 04:03:08,526 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 04:03:08,552 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-11-03 04:03:08,727 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:03:08,727 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 04:03:08,727 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 04:03:08,727 INFO L85 PathProgramCache]: Analyzing trace with hash -381213067, now seen corresponding path program 10 times [2022-11-03 04:03:08,728 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 04:03:08,728 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [500228150] [2022-11-03 04:03:08,728 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 04:03:08,728 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 04:03:08,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 04:03:09,702 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 04:03:09,702 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 04:03:09,702 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [500228150] [2022-11-03 04:03:09,703 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [500228150] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 04:03:09,703 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1418548592] [2022-11-03 04:03:09,703 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 04:03:09,703 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:03:09,703 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 04:03:09,704 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 04:03:09,705 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-03 04:03:09,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 04:03:09,748 WARN L261 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 61 conjunts are in the unsatisfiable core [2022-11-03 04:03:09,750 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 04:03:11,871 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 04:03:11,871 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 04:03:13,667 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 04:03:13,667 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1418548592] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 04:03:13,667 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1296425910] [2022-11-03 04:03:13,669 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-03 04:03:13,669 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 04:03:13,669 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 04:03:13,669 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 04:03:13,670 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 04:03:13,809 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 04:03:15,368 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3547#(and (<= 4 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_correct_version_#res#1| 1) (<= 4 |ULTIMATE.start_student_version_~w#1|) (<= |ULTIMATE.start_main_~is_divisible1~0#1| 1) (<= 4 |ULTIMATE.start_correct_version_~w#1|) (<= 4 |ULTIMATE.start_student_version_#in~w#1|) (<= 0 |ULTIMATE.start_correct_version_~is_divisible~0#1|) (= ~true~0 1) (<= |ULTIMATE.start_correct_version_~is_divisible~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 4 |ULTIMATE.start_correct_version_#in~w#1|) (not (< |ULTIMATE.start_student_version_~i~1#1| |ULTIMATE.start_student_version_~w#1|)) (= ~false~0 0) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (or (and (not (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start_student_version_~is_divisible~1#1| ~false~0)) (and (<= 1 |ULTIMATE.start_student_version_~is_divisible~1#1|) (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|) (<= |ULTIMATE.start_student_version_~is_divisible~1#1| 1))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~is_divisible1~0#1|) (= |ULTIMATE.start_student_version_~is_divisible~1#1| |ULTIMATE.start_student_version_#res#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (= |#NULL.base| 0))' at error location [2022-11-03 04:03:15,368 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 04:03:15,368 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 04:03:15,369 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 63 [2022-11-03 04:03:15,369 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [577078507] [2022-11-03 04:03:15,369 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 04:03:15,369 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 63 states [2022-11-03 04:03:15,370 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 04:03:15,370 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2022-11-03 04:03:15,371 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=289, Invalid=4823, Unknown=0, NotChecked=0, Total=5112 [2022-11-03 04:03:15,372 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand has 63 states, 63 states have (on average 1.0634920634920635) internal successors, (67), 63 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 04:03:30,171 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 04:03:30,171 INFO L93 Difference]: Finished difference Result 82 states and 93 transitions. [2022-11-03 04:03:30,172 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2022-11-03 04:03:30,172 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 63 states have (on average 1.0634920634920635) internal successors, (67), 63 states have internal predecessors, (67), 0 states have call successors, (0), 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 [2022-11-03 04:03:30,172 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 04:03:30,173 INFO L225 Difference]: With dead ends: 82 [2022-11-03 04:03:30,173 INFO L226 Difference]: Without dead ends: 65 [2022-11-03 04:03:30,175 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3764 ImplicationChecksByTransitivity, 18.5s TimeCoverageRelationStatistics Valid=1005, Invalid=12567, Unknown=0, NotChecked=0, Total=13572 [2022-11-03 04:03:30,175 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 125 mSDsluCounter, 74 mSDsCounter, 0 mSdLazyCounter, 978 mSolverCounterSat, 344 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 125 SdHoareTripleChecker+Valid, 67 SdHoareTripleChecker+Invalid, 1322 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 344 IncrementalHoareTripleChecker+Valid, 978 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-11-03 04:03:30,175 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [125 Valid, 67 Invalid, 1322 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [344 Valid, 978 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-11-03 04:03:30,176 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2022-11-03 04:03:30,212 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 27. [2022-11-03 04:03:30,212 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.0769230769230769) internal successors, (28), 26 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 04:03:30,212 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2022-11-03 04:03:30,212 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 24 [2022-11-03 04:03:30,213 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 04:03:30,213 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2022-11-03 04:03:30,213 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 63 states, 63 states have (on average 1.0634920634920635) internal successors, (67), 63 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 04:03:30,213 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2022-11-03 04:03:30,214 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-11-03 04:03:30,214 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 04:03:30,214 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 04:03:30,235 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-03 04:03:30,416 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-11-03 04:03:30,416 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 04:03:30,417 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 04:03:30,417 INFO L85 PathProgramCache]: Analyzing trace with hash 1864319346, now seen corresponding path program 11 times [2022-11-03 04:03:30,417 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 04:03:30,417 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [829183843] [2022-11-03 04:03:30,417 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 04:03:30,417 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 04:03:30,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 04:03:31,476 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 04:03:31,476 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 04:03:31,476 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [829183843] [2022-11-03 04:03:31,477 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [829183843] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 04:03:31,477 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [307934208] [2022-11-03 04:03:31,477 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 04:03:31,477 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:03:31,477 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 04:03:31,478 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 04:03:31,479 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-03 04:03:31,535 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-11-03 04:03:31,535 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 04:03:31,537 WARN L261 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 67 conjunts are in the unsatisfiable core [2022-11-03 04:03:31,539 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 04:03:34,347 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 04:03:34,348 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 04:03:36,891 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 04:03:36,891 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [307934208] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 04:03:36,891 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [906853576] [2022-11-03 04:03:36,893 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-03 04:03:36,893 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 04:03:36,893 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 04:03:36,894 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 04:03:36,894 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 04:03:37,044 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 04:03:38,734 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4057#(and (<= 4 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_correct_version_#res#1| 1) (<= 4 |ULTIMATE.start_student_version_~w#1|) (<= |ULTIMATE.start_main_~is_divisible1~0#1| 1) (<= 4 |ULTIMATE.start_correct_version_~w#1|) (<= 4 |ULTIMATE.start_student_version_#in~w#1|) (<= 0 |ULTIMATE.start_correct_version_~is_divisible~0#1|) (= ~true~0 1) (<= |ULTIMATE.start_correct_version_~is_divisible~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 4 |ULTIMATE.start_correct_version_#in~w#1|) (not (< |ULTIMATE.start_student_version_~i~1#1| |ULTIMATE.start_student_version_~w#1|)) (= ~false~0 0) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (or (and (not (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start_student_version_~is_divisible~1#1| ~false~0)) (and (<= 1 |ULTIMATE.start_student_version_~is_divisible~1#1|) (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|) (<= |ULTIMATE.start_student_version_~is_divisible~1#1| 1))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~is_divisible1~0#1|) (= |ULTIMATE.start_student_version_~is_divisible~1#1| |ULTIMATE.start_student_version_#res#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (= |#NULL.base| 0))' at error location [2022-11-03 04:03:38,734 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 04:03:38,734 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 04:03:38,734 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 70 [2022-11-03 04:03:38,735 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1130634690] [2022-11-03 04:03:38,735 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 04:03:38,735 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 70 states [2022-11-03 04:03:38,735 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 04:03:38,736 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2022-11-03 04:03:38,737 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=319, Invalid=5843, Unknown=0, NotChecked=0, Total=6162 [2022-11-03 04:03:38,737 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand has 70 states, 70 states have (on average 1.0571428571428572) internal successors, (74), 70 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 04:03:53,523 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 04:03:53,523 INFO L93 Difference]: Finished difference Result 91 states and 105 transitions. [2022-11-03 04:03:53,524 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2022-11-03 04:03:53,524 INFO L78 Accepts]: Start accepts. Automaton has has 70 states, 70 states have (on average 1.0571428571428572) internal successors, (74), 70 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2022-11-03 04:03:53,524 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 04:03:53,525 INFO L225 Difference]: With dead ends: 91 [2022-11-03 04:03:53,525 INFO L226 Difference]: Without dead ends: 69 [2022-11-03 04:03:53,527 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 23 SyntacticMatches, 1 SemanticMatches, 130 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4907 ImplicationChecksByTransitivity, 19.2s TimeCoverageRelationStatistics Valid=1218, Invalid=16074, Unknown=0, NotChecked=0, Total=17292 [2022-11-03 04:03:53,527 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 158 mSDsluCounter, 92 mSDsCounter, 0 mSdLazyCounter, 1321 mSolverCounterSat, 416 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 158 SdHoareTripleChecker+Valid, 89 SdHoareTripleChecker+Invalid, 1737 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 416 IncrementalHoareTripleChecker+Valid, 1321 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2022-11-03 04:03:53,528 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [158 Valid, 89 Invalid, 1737 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [416 Valid, 1321 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2022-11-03 04:03:53,528 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2022-11-03 04:03:53,578 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 40. [2022-11-03 04:03:53,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 39 states have (on average 1.2820512820512822) internal successors, (50), 39 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 04:03:53,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 50 transitions. [2022-11-03 04:03:53,579 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 50 transitions. Word has length 26 [2022-11-03 04:03:53,579 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 04:03:53,579 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 50 transitions. [2022-11-03 04:03:53,579 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 70 states, 70 states have (on average 1.0571428571428572) internal successors, (74), 70 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 04:03:53,579 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 50 transitions. [2022-11-03 04:03:53,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-11-03 04:03:53,581 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 04:03:53,581 INFO L195 NwaCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 04:03:53,605 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-11-03 04:03:53,782 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-11-03 04:03:53,782 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 04:03:53,782 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 04:03:53,783 INFO L85 PathProgramCache]: Analyzing trace with hash 14034197, now seen corresponding path program 12 times [2022-11-03 04:03:53,783 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 04:03:53,783 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [95923950] [2022-11-03 04:03:53,783 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 04:03:53,783 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 04:03:53,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 04:03:55,194 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 04:03:55,194 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 04:03:55,194 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [95923950] [2022-11-03 04:03:55,195 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [95923950] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 04:03:55,195 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1910106595] [2022-11-03 04:03:55,195 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 04:03:55,195 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:03:55,195 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 04:03:55,196 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 04:03:55,200 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-03 04:03:55,254 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 04:03:55,255 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 04:03:55,257 WARN L261 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 69 conjunts are in the unsatisfiable core [2022-11-03 04:03:55,259 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 04:03:58,279 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 04:03:58,279 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 04:04:00,712 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 04:04:00,713 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1910106595] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 04:04:00,713 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2021765801] [2022-11-03 04:04:00,714 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-03 04:04:00,714 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 04:04:00,715 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 04:04:00,715 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 04:04:00,715 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 04:04:00,861 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 04:04:02,707 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4641#(and (<= 4 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_correct_version_#res#1| 1) (<= 4 |ULTIMATE.start_student_version_~w#1|) (<= |ULTIMATE.start_main_~is_divisible1~0#1| 1) (<= 4 |ULTIMATE.start_correct_version_~w#1|) (<= 4 |ULTIMATE.start_student_version_#in~w#1|) (<= 0 |ULTIMATE.start_correct_version_~is_divisible~0#1|) (= ~true~0 1) (<= |ULTIMATE.start_correct_version_~is_divisible~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 4 |ULTIMATE.start_correct_version_#in~w#1|) (not (< |ULTIMATE.start_student_version_~i~1#1| |ULTIMATE.start_student_version_~w#1|)) (= ~false~0 0) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (or (and (not (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start_student_version_~is_divisible~1#1| ~false~0)) (and (<= 1 |ULTIMATE.start_student_version_~is_divisible~1#1|) (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|) (<= |ULTIMATE.start_student_version_~is_divisible~1#1| 1))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~is_divisible1~0#1|) (= |ULTIMATE.start_student_version_~is_divisible~1#1| |ULTIMATE.start_student_version_#res#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (= |#NULL.base| 0))' at error location [2022-11-03 04:04:02,707 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 04:04:02,707 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 04:04:02,707 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 75 [2022-11-03 04:04:02,707 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1210913438] [2022-11-03 04:04:02,707 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 04:04:02,708 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 75 states [2022-11-03 04:04:02,708 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 04:04:02,708 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2022-11-03 04:04:02,709 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=343, Invalid=6629, Unknown=0, NotChecked=0, Total=6972 [2022-11-03 04:04:02,709 INFO L87 Difference]: Start difference. First operand 40 states and 50 transitions. Second operand has 75 states, 75 states have (on average 1.0533333333333332) internal successors, (79), 75 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 04:04:26,492 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 04:04:26,492 INFO L93 Difference]: Finished difference Result 115 states and 130 transitions. [2022-11-03 04:04:26,492 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2022-11-03 04:04:26,493 INFO L78 Accepts]: Start accepts. Automaton has has 75 states, 75 states have (on average 1.0533333333333332) internal successors, (79), 75 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2022-11-03 04:04:26,493 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 04:04:26,493 INFO L225 Difference]: With dead ends: 115 [2022-11-03 04:04:26,493 INFO L226 Difference]: Without dead ends: 92 [2022-11-03 04:04:26,495 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 25 SyntacticMatches, 2 SemanticMatches, 141 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5810 ImplicationChecksByTransitivity, 28.5s TimeCoverageRelationStatistics Valid=1418, Invalid=18888, Unknown=0, NotChecked=0, Total=20306 [2022-11-03 04:04:26,496 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 254 mSDsluCounter, 142 mSDsCounter, 0 mSdLazyCounter, 1786 mSolverCounterSat, 526 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 254 SdHoareTripleChecker+Valid, 139 SdHoareTripleChecker+Invalid, 2312 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 526 IncrementalHoareTripleChecker+Valid, 1786 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2022-11-03 04:04:26,497 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [254 Valid, 139 Invalid, 2312 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [526 Valid, 1786 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2022-11-03 04:04:26,497 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2022-11-03 04:04:26,592 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 54. [2022-11-03 04:04:26,592 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 53 states have (on average 1.2452830188679245) internal successors, (66), 53 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 04:04:26,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 66 transitions. [2022-11-03 04:04:26,593 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 66 transitions. Word has length 28 [2022-11-03 04:04:26,593 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 04:04:26,593 INFO L495 AbstractCegarLoop]: Abstraction has 54 states and 66 transitions. [2022-11-03 04:04:26,594 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 75 states, 75 states have (on average 1.0533333333333332) internal successors, (79), 75 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 04:04:26,594 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 66 transitions. [2022-11-03 04:04:26,595 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-11-03 04:04:26,595 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 04:04:26,595 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 04:04:26,621 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-11-03 04:04:26,799 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:04:26,799 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 04:04:26,799 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 04:04:26,799 INFO L85 PathProgramCache]: Analyzing trace with hash 236688594, now seen corresponding path program 13 times [2022-11-03 04:04:26,800 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 04:04:26,800 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [604644301] [2022-11-03 04:04:26,800 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 04:04:26,800 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 04:04:26,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 04:04:28,158 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 04:04:28,159 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 04:04:28,159 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [604644301] [2022-11-03 04:04:28,159 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [604644301] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 04:04:28,159 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1251552603] [2022-11-03 04:04:28,159 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 04:04:28,159 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:04:28,159 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 04:04:28,160 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 04:04:28,162 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-03 04:04:28,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 04:04:28,205 WARN L261 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 73 conjunts are in the unsatisfiable core [2022-11-03 04:04:28,207 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 04:04:31,724 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 04:04:31,724 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 04:04:34,556 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 04:04:34,556 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1251552603] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 04:04:34,556 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [344365036] [2022-11-03 04:04:34,557 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-03 04:04:34,557 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 04:04:34,558 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 04:04:34,558 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 04:04:34,558 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 04:04:34,695 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 04:04:36,626 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5323#(and (<= 4 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_correct_version_#res#1| 1) (<= 4 |ULTIMATE.start_student_version_~w#1|) (<= |ULTIMATE.start_main_~is_divisible1~0#1| 1) (<= 4 |ULTIMATE.start_correct_version_~w#1|) (<= 4 |ULTIMATE.start_student_version_#in~w#1|) (<= 0 |ULTIMATE.start_correct_version_~is_divisible~0#1|) (= ~true~0 1) (<= |ULTIMATE.start_correct_version_~is_divisible~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 4 |ULTIMATE.start_correct_version_#in~w#1|) (not (< |ULTIMATE.start_student_version_~i~1#1| |ULTIMATE.start_student_version_~w#1|)) (= ~false~0 0) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (or (and (not (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start_student_version_~is_divisible~1#1| ~false~0)) (and (<= 1 |ULTIMATE.start_student_version_~is_divisible~1#1|) (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|) (<= |ULTIMATE.start_student_version_~is_divisible~1#1| 1))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~is_divisible1~0#1|) (= |ULTIMATE.start_student_version_~is_divisible~1#1| |ULTIMATE.start_student_version_#res#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (= |#NULL.base| 0))' at error location [2022-11-03 04:04:36,626 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 04:04:36,626 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 04:04:36,626 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 81 [2022-11-03 04:04:36,626 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1353556588] [2022-11-03 04:04:36,626 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 04:04:36,627 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 81 states [2022-11-03 04:04:36,627 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 04:04:36,628 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 81 interpolants. [2022-11-03 04:04:36,628 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=370, Invalid=7640, Unknown=0, NotChecked=0, Total=8010 [2022-11-03 04:04:36,629 INFO L87 Difference]: Start difference. First operand 54 states and 66 transitions. Second operand has 81 states, 81 states have (on average 1.0493827160493827) internal successors, (85), 81 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 04:05:05,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 04:05:05,223 INFO L93 Difference]: Finished difference Result 132 states and 151 transitions. [2022-11-03 04:05:05,223 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2022-11-03 04:05:05,223 INFO L78 Accepts]: Start accepts. Automaton has has 81 states, 81 states have (on average 1.0493827160493827) internal successors, (85), 81 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 30 [2022-11-03 04:05:05,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 04:05:05,224 INFO L225 Difference]: With dead ends: 132 [2022-11-03 04:05:05,224 INFO L226 Difference]: Without dead ends: 108 [2022-11-03 04:05:05,225 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 180 GetRequests, 28 SyntacticMatches, 1 SemanticMatches, 151 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6663 ImplicationChecksByTransitivity, 33.6s TimeCoverageRelationStatistics Valid=1550, Invalid=21706, Unknown=0, NotChecked=0, Total=23256 [2022-11-03 04:05:05,226 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 272 mSDsluCounter, 155 mSDsCounter, 0 mSdLazyCounter, 1938 mSolverCounterSat, 650 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 272 SdHoareTripleChecker+Valid, 153 SdHoareTripleChecker+Invalid, 2588 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 650 IncrementalHoareTripleChecker+Valid, 1938 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2022-11-03 04:05:05,226 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [272 Valid, 153 Invalid, 2588 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [650 Valid, 1938 Invalid, 0 Unknown, 0 Unchecked, 2.3s Time] [2022-11-03 04:05:05,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2022-11-03 04:05:05,354 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 69. [2022-11-03 04:05:05,354 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 68 states have (on average 1.2352941176470589) internal successors, (84), 68 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 04:05:05,354 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 84 transitions. [2022-11-03 04:05:05,354 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 84 transitions. Word has length 30 [2022-11-03 04:05:05,354 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 04:05:05,355 INFO L495 AbstractCegarLoop]: Abstraction has 69 states and 84 transitions. [2022-11-03 04:05:05,355 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 81 states, 81 states have (on average 1.0493827160493827) internal successors, (85), 81 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 04:05:05,355 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 84 transitions. [2022-11-03 04:05:05,355 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-11-03 04:05:05,355 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 04:05:05,355 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 04:05:05,384 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-11-03 04:05:05,559 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:05:05,559 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 04:05:05,559 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 04:05:05,559 INFO L85 PathProgramCache]: Analyzing trace with hash -1993851979, now seen corresponding path program 14 times [2022-11-03 04:05:05,560 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 04:05:05,560 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [305789700] [2022-11-03 04:05:05,560 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 04:05:05,560 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 04:05:05,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 04:05:07,057 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 04:05:07,057 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 04:05:07,058 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [305789700] [2022-11-03 04:05:07,058 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [305789700] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 04:05:07,058 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [460633561] [2022-11-03 04:05:07,058 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 04:05:07,058 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:05:07,058 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 04:05:07,059 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 04:05:07,060 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-11-03 04:05:07,108 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2022-11-03 04:05:07,108 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 04:05:07,110 WARN L261 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 79 conjunts are in the unsatisfiable core [2022-11-03 04:05:07,112 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 04:05:10,901 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 04:05:10,901 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 04:05:14,511 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 04:05:14,511 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [460633561] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 04:05:14,511 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1181828562] [2022-11-03 04:05:14,513 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-03 04:05:14,513 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 04:05:14,513 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 04:05:14,513 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 04:05:14,513 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 04:05:14,648 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 04:05:16,660 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6094#(and (<= 4 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_correct_version_#res#1| 1) (<= 4 |ULTIMATE.start_student_version_~w#1|) (<= |ULTIMATE.start_main_~is_divisible1~0#1| 1) (<= 4 |ULTIMATE.start_correct_version_~w#1|) (<= 4 |ULTIMATE.start_student_version_#in~w#1|) (<= 0 |ULTIMATE.start_correct_version_~is_divisible~0#1|) (= ~true~0 1) (<= |ULTIMATE.start_correct_version_~is_divisible~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 4 |ULTIMATE.start_correct_version_#in~w#1|) (not (< |ULTIMATE.start_student_version_~i~1#1| |ULTIMATE.start_student_version_~w#1|)) (= ~false~0 0) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (or (and (not (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start_student_version_~is_divisible~1#1| ~false~0)) (and (<= 1 |ULTIMATE.start_student_version_~is_divisible~1#1|) (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|) (<= |ULTIMATE.start_student_version_~is_divisible~1#1| 1))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~is_divisible1~0#1|) (= |ULTIMATE.start_student_version_~is_divisible~1#1| |ULTIMATE.start_student_version_#res#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (= |#NULL.base| 0))' at error location [2022-11-03 04:05:16,660 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 04:05:16,660 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 04:05:16,660 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 88 [2022-11-03 04:05:16,661 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1443907578] [2022-11-03 04:05:16,661 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 04:05:16,661 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 88 states [2022-11-03 04:05:16,661 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 04:05:16,662 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 88 interpolants. [2022-11-03 04:05:16,662 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=400, Invalid=8912, Unknown=0, NotChecked=0, Total=9312 [2022-11-03 04:05:16,663 INFO L87 Difference]: Start difference. First operand 69 states and 84 transitions. Second operand has 88 states, 88 states have (on average 1.0454545454545454) internal successors, (92), 88 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 04:05:37,841 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 04:05:37,841 INFO L93 Difference]: Finished difference Result 150 states and 174 transitions. [2022-11-03 04:05:37,842 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2022-11-03 04:05:37,842 INFO L78 Accepts]: Start accepts. Automaton has has 88 states, 88 states have (on average 1.0454545454545454) internal successors, (92), 88 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 32 [2022-11-03 04:05:37,842 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 04:05:37,843 INFO L225 Difference]: With dead ends: 150 [2022-11-03 04:05:37,843 INFO L226 Difference]: Without dead ends: 125 [2022-11-03 04:05:37,844 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 29 SyntacticMatches, 1 SemanticMatches, 162 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7751 ImplicationChecksByTransitivity, 26.9s TimeCoverageRelationStatistics Valid=1691, Invalid=25041, Unknown=0, NotChecked=0, Total=26732 [2022-11-03 04:05:37,845 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 276 mSDsluCounter, 157 mSDsCounter, 0 mSdLazyCounter, 2348 mSolverCounterSat, 701 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 276 SdHoareTripleChecker+Valid, 157 SdHoareTripleChecker+Invalid, 3049 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 701 IncrementalHoareTripleChecker+Valid, 2348 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2022-11-03 04:05:37,845 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [276 Valid, 157 Invalid, 3049 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [701 Valid, 2348 Invalid, 0 Unknown, 0 Unchecked, 2.4s Time] [2022-11-03 04:05:37,846 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2022-11-03 04:05:38,070 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 85. [2022-11-03 04:05:38,070 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 84 states have (on average 1.2380952380952381) internal successors, (104), 84 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 04:05:38,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 104 transitions. [2022-11-03 04:05:38,071 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 104 transitions. Word has length 32 [2022-11-03 04:05:38,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 04:05:38,071 INFO L495 AbstractCegarLoop]: Abstraction has 85 states and 104 transitions. [2022-11-03 04:05:38,071 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 88 states, 88 states have (on average 1.0454545454545454) internal successors, (92), 88 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 04:05:38,071 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 104 transitions. [2022-11-03 04:05:38,072 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-11-03 04:05:38,072 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 04:05:38,072 INFO L195 NwaCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 04:05:38,093 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-11-03 04:05:38,273 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:05:38,273 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 04:05:38,274 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 04:05:38,274 INFO L85 PathProgramCache]: Analyzing trace with hash -154611662, now seen corresponding path program 15 times [2022-11-03 04:05:38,274 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 04:05:38,274 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1004804845] [2022-11-03 04:05:38,274 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 04:05:38,274 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 04:05:38,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 04:05:40,029 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 04:05:40,029 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 04:05:40,029 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1004804845] [2022-11-03 04:05:40,029 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1004804845] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 04:05:40,029 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [667647501] [2022-11-03 04:05:40,029 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 04:05:40,029 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:05:40,030 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 04:05:40,030 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 04:05:40,033 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-11-03 04:05:40,079 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 04:05:40,079 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 04:05:40,081 WARN L261 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 81 conjunts are in the unsatisfiable core [2022-11-03 04:05:40,083 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 04:05:44,569 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 04:05:44,569 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 04:05:48,264 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 04:05:48,265 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [667647501] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 04:05:48,265 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1146203912] [2022-11-03 04:05:48,266 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-03 04:05:48,266 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 04:05:48,266 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 04:05:48,267 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 04:05:48,267 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 04:05:48,404 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 04:05:50,389 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6956#(and (<= 4 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_correct_version_#res#1| 1) (<= 4 |ULTIMATE.start_student_version_~w#1|) (<= |ULTIMATE.start_main_~is_divisible1~0#1| 1) (<= 4 |ULTIMATE.start_correct_version_~w#1|) (<= 4 |ULTIMATE.start_student_version_#in~w#1|) (<= 0 |ULTIMATE.start_correct_version_~is_divisible~0#1|) (= ~true~0 1) (<= |ULTIMATE.start_correct_version_~is_divisible~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 4 |ULTIMATE.start_correct_version_#in~w#1|) (not (< |ULTIMATE.start_student_version_~i~1#1| |ULTIMATE.start_student_version_~w#1|)) (= ~false~0 0) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (or (and (not (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start_student_version_~is_divisible~1#1| ~false~0)) (and (<= 1 |ULTIMATE.start_student_version_~is_divisible~1#1|) (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|) (<= |ULTIMATE.start_student_version_~is_divisible~1#1| 1))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~is_divisible1~0#1|) (= |ULTIMATE.start_student_version_~is_divisible~1#1| |ULTIMATE.start_student_version_#res#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (= |#NULL.base| 0))' at error location [2022-11-03 04:05:50,389 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 04:05:50,389 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 04:05:50,390 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 93 [2022-11-03 04:05:50,390 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1909069697] [2022-11-03 04:05:50,390 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 04:05:50,390 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 93 states [2022-11-03 04:05:50,390 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 04:05:50,396 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 93 interpolants. [2022-11-03 04:05:50,397 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=424, Invalid=9878, Unknown=0, NotChecked=0, Total=10302 [2022-11-03 04:05:50,397 INFO L87 Difference]: Start difference. First operand 85 states and 104 transitions. Second operand has 93 states, 93 states have (on average 1.043010752688172) internal successors, (97), 93 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 04:06:25,379 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 04:06:25,379 INFO L93 Difference]: Finished difference Result 169 states and 199 transitions. [2022-11-03 04:06:25,380 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2022-11-03 04:06:25,380 INFO L78 Accepts]: Start accepts. Automaton has has 93 states, 93 states have (on average 1.043010752688172) internal successors, (97), 93 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 34 [2022-11-03 04:06:25,380 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 04:06:25,381 INFO L225 Difference]: With dead ends: 169 [2022-11-03 04:06:25,381 INFO L226 Difference]: Without dead ends: 143 [2022-11-03 04:06:25,382 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 204 GetRequests, 31 SyntacticMatches, 2 SemanticMatches, 171 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8666 ImplicationChecksByTransitivity, 41.0s TimeCoverageRelationStatistics Valid=1826, Invalid=27930, Unknown=0, NotChecked=0, Total=29756 [2022-11-03 04:06:25,383 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 320 mSDsluCounter, 167 mSDsCounter, 0 mSdLazyCounter, 2540 mSolverCounterSat, 921 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 320 SdHoareTripleChecker+Valid, 165 SdHoareTripleChecker+Invalid, 3461 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 921 IncrementalHoareTripleChecker+Valid, 2540 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.0s IncrementalHoareTripleChecker+Time [2022-11-03 04:06:25,383 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [320 Valid, 165 Invalid, 3461 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [921 Valid, 2540 Invalid, 0 Unknown, 0 Unchecked, 3.0s Time] [2022-11-03 04:06:25,384 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2022-11-03 04:06:25,611 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 102. [2022-11-03 04:06:25,611 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 102 states, 101 states have (on average 1.2475247524752475) internal successors, (126), 101 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 04:06:25,612 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 126 transitions. [2022-11-03 04:06:25,612 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 126 transitions. Word has length 34 [2022-11-03 04:06:25,612 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 04:06:25,612 INFO L495 AbstractCegarLoop]: Abstraction has 102 states and 126 transitions. [2022-11-03 04:06:25,612 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 93 states, 93 states have (on average 1.043010752688172) internal successors, (97), 93 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 04:06:25,612 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 126 transitions. [2022-11-03 04:06:25,613 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-11-03 04:06:25,613 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 04:06:25,613 INFO L195 NwaCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 04:06:25,635 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-11-03 04:06:25,819 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:06:25,819 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 04:06:25,820 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 04:06:25,820 INFO L85 PathProgramCache]: Analyzing trace with hash 1605855829, now seen corresponding path program 16 times [2022-11-03 04:06:25,820 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 04:06:25,820 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1491797041] [2022-11-03 04:06:25,820 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 04:06:25,821 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 04:06:25,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 04:06:27,520 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 04:06:27,520 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 04:06:27,520 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1491797041] [2022-11-03 04:06:27,520 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1491797041] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 04:06:27,521 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1188249854] [2022-11-03 04:06:27,521 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 04:06:27,521 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:06:27,521 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 04:06:27,522 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 04:06:27,523 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-11-03 04:06:27,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 04:06:27,580 WARN L261 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 85 conjunts are in the unsatisfiable core [2022-11-03 04:06:27,582 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 04:06:31,699 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 04:06:31,699 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 04:06:35,785 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 04:06:35,787 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1188249854] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 04:06:35,787 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1537068622] [2022-11-03 04:06:35,789 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-03 04:06:35,790 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 04:06:35,790 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 04:06:35,791 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 04:06:35,791 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 04:06:35,916 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 04:06:37,990 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7914#(and (<= 4 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_correct_version_#res#1| 1) (<= 4 |ULTIMATE.start_student_version_~w#1|) (<= |ULTIMATE.start_main_~is_divisible1~0#1| 1) (<= 4 |ULTIMATE.start_correct_version_~w#1|) (<= 4 |ULTIMATE.start_student_version_#in~w#1|) (<= 0 |ULTIMATE.start_correct_version_~is_divisible~0#1|) (= ~true~0 1) (<= |ULTIMATE.start_correct_version_~is_divisible~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 4 |ULTIMATE.start_correct_version_#in~w#1|) (not (< |ULTIMATE.start_student_version_~i~1#1| |ULTIMATE.start_student_version_~w#1|)) (= ~false~0 0) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (or (and (not (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start_student_version_~is_divisible~1#1| ~false~0)) (and (<= 1 |ULTIMATE.start_student_version_~is_divisible~1#1|) (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|) (<= |ULTIMATE.start_student_version_~is_divisible~1#1| 1))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~is_divisible1~0#1|) (= |ULTIMATE.start_student_version_~is_divisible~1#1| |ULTIMATE.start_student_version_#res#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (= |#NULL.base| 0))' at error location [2022-11-03 04:06:37,990 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 04:06:37,990 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 04:06:37,991 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 99 [2022-11-03 04:06:37,991 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2089253897] [2022-11-03 04:06:37,991 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 04:06:37,991 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 99 states [2022-11-03 04:06:37,991 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 04:06:37,991 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 99 interpolants. [2022-11-03 04:06:37,992 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=451, Invalid=11105, Unknown=0, NotChecked=0, Total=11556 [2022-11-03 04:06:37,992 INFO L87 Difference]: Start difference. First operand 102 states and 126 transitions. Second operand has 99 states, 99 states have (on average 1.0404040404040404) internal successors, (103), 99 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 04:07:13,924 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 04:07:13,924 INFO L93 Difference]: Finished difference Result 189 states and 226 transitions. [2022-11-03 04:07:13,926 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2022-11-03 04:07:13,927 INFO L78 Accepts]: Start accepts. Automaton has has 99 states, 99 states have (on average 1.0404040404040404) internal successors, (103), 99 states have internal predecessors, (103), 0 states have call successors, (0), 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 36 [2022-11-03 04:07:13,927 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 04:07:13,928 INFO L225 Difference]: With dead ends: 189 [2022-11-03 04:07:13,928 INFO L226 Difference]: Without dead ends: 162 [2022-11-03 04:07:13,930 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 216 GetRequests, 34 SyntacticMatches, 1 SemanticMatches, 181 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9694 ImplicationChecksByTransitivity, 41.6s TimeCoverageRelationStatistics Valid=1970, Invalid=31336, Unknown=0, NotChecked=0, Total=33306 [2022-11-03 04:07:13,931 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 366 mSDsluCounter, 152 mSDsCounter, 0 mSdLazyCounter, 3146 mSolverCounterSat, 1007 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 366 SdHoareTripleChecker+Valid, 148 SdHoareTripleChecker+Invalid, 4153 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1007 IncrementalHoareTripleChecker+Valid, 3146 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.4s IncrementalHoareTripleChecker+Time [2022-11-03 04:07:13,931 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [366 Valid, 148 Invalid, 4153 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1007 Valid, 3146 Invalid, 0 Unknown, 0 Unchecked, 3.4s Time] [2022-11-03 04:07:13,931 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2022-11-03 04:07:14,231 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 120. [2022-11-03 04:07:14,231 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 120 states, 119 states have (on average 1.2605042016806722) internal successors, (150), 119 states have internal predecessors, (150), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 04:07:14,231 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 150 transitions. [2022-11-03 04:07:14,232 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 150 transitions. Word has length 36 [2022-11-03 04:07:14,232 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 04:07:14,232 INFO L495 AbstractCegarLoop]: Abstraction has 120 states and 150 transitions. [2022-11-03 04:07:14,232 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 99 states, 99 states have (on average 1.0404040404040404) internal successors, (103), 99 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 04:07:14,232 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 150 transitions. [2022-11-03 04:07:14,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-11-03 04:07:14,232 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 04:07:14,232 INFO L195 NwaCegarLoop]: trace histogram [18, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 04:07:14,255 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-11-03 04:07:14,433 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:07:14,433 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 04:07:14,433 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 04:07:14,434 INFO L85 PathProgramCache]: Analyzing trace with hash -364431630, now seen corresponding path program 17 times [2022-11-03 04:07:14,434 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 04:07:14,434 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2016719852] [2022-11-03 04:07:14,434 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 04:07:14,434 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 04:07:14,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 04:07:15,722 INFO L134 CoverageAnalysis]: Checked inductivity of 207 backedges. 136 proven. 71 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 04:07:15,722 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 04:07:15,723 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2016719852] [2022-11-03 04:07:15,723 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2016719852] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 04:07:15,723 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [79878974] [2022-11-03 04:07:15,723 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 04:07:15,723 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:07:15,723 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 04:07:15,724 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 04:07:15,726 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-11-03 04:07:15,792 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2022-11-03 04:07:15,793 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 04:07:15,794 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 24 conjunts are in the unsatisfiable core [2022-11-03 04:07:15,795 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 04:07:16,874 INFO L134 CoverageAnalysis]: Checked inductivity of 207 backedges. 36 proven. 126 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2022-11-03 04:07:16,874 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 04:07:17,783 INFO L134 CoverageAnalysis]: Checked inductivity of 207 backedges. 126 proven. 36 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2022-11-03 04:07:17,784 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [79878974] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 04:07:17,784 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1391398267] [2022-11-03 04:07:17,785 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-03 04:07:17,785 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 04:07:17,785 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 04:07:17,786 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 04:07:17,786 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 04:07:17,940 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 04:07:19,164 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8928#(and (<= 4 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_correct_version_#res#1| 1) (<= 4 |ULTIMATE.start_student_version_~w#1|) (<= |ULTIMATE.start_main_~is_divisible1~0#1| 1) (<= 4 |ULTIMATE.start_correct_version_~w#1|) (<= 4 |ULTIMATE.start_student_version_#in~w#1|) (<= 0 |ULTIMATE.start_correct_version_~is_divisible~0#1|) (= ~true~0 1) (<= |ULTIMATE.start_correct_version_~is_divisible~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 4 |ULTIMATE.start_correct_version_#in~w#1|) (not (< |ULTIMATE.start_student_version_~i~1#1| |ULTIMATE.start_student_version_~w#1|)) (= ~false~0 0) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (or (and (not (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start_student_version_~is_divisible~1#1| ~false~0)) (and (<= 1 |ULTIMATE.start_student_version_~is_divisible~1#1|) (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|) (<= |ULTIMATE.start_student_version_~is_divisible~1#1| 1))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~is_divisible1~0#1|) (= |ULTIMATE.start_student_version_~is_divisible~1#1| |ULTIMATE.start_student_version_#res#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (= |#NULL.base| 0))' at error location [2022-11-03 04:07:19,164 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 04:07:19,164 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 04:07:19,164 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 23, 23] total 73 [2022-11-03 04:07:19,164 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1628477604] [2022-11-03 04:07:19,164 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 04:07:19,165 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 73 states [2022-11-03 04:07:19,165 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 04:07:19,165 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2022-11-03 04:07:19,166 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1054, Invalid=5588, Unknown=0, NotChecked=0, Total=6642 [2022-11-03 04:07:19,166 INFO L87 Difference]: Start difference. First operand 120 states and 150 transitions. Second operand has 73 states, 73 states have (on average 1.1095890410958904) internal successors, (81), 73 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 04:07:26,038 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 04:07:26,038 INFO L93 Difference]: Finished difference Result 215 states and 254 transitions. [2022-11-03 04:07:26,039 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2022-11-03 04:07:26,039 INFO L78 Accepts]: Start accepts. Automaton has has 73 states, 73 states have (on average 1.1095890410958904) internal successors, (81), 73 states have internal predecessors, (81), 0 states have call successors, (0), 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 36 [2022-11-03 04:07:26,039 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 04:07:26,040 INFO L225 Difference]: With dead ends: 215 [2022-11-03 04:07:26,040 INFO L226 Difference]: Without dead ends: 211 [2022-11-03 04:07:26,041 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 208 GetRequests, 57 SyntacticMatches, 2 SemanticMatches, 149 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6022 ImplicationChecksByTransitivity, 9.2s TimeCoverageRelationStatistics Valid=5953, Invalid=16697, Unknown=0, NotChecked=0, Total=22650 [2022-11-03 04:07:26,042 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 68 mSDsluCounter, 101 mSDsCounter, 0 mSdLazyCounter, 522 mSolverCounterSat, 126 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 68 SdHoareTripleChecker+Valid, 77 SdHoareTripleChecker+Invalid, 648 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 126 IncrementalHoareTripleChecker+Valid, 522 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-03 04:07:26,042 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [68 Valid, 77 Invalid, 648 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [126 Valid, 522 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-03 04:07:26,043 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 211 states. [2022-11-03 04:07:26,197 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 211 to 49. [2022-11-03 04:07:26,198 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 48 states have (on average 1.125) internal successors, (54), 48 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 04:07:26,198 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 54 transitions. [2022-11-03 04:07:26,198 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 54 transitions. Word has length 36 [2022-11-03 04:07:26,198 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 04:07:26,198 INFO L495 AbstractCegarLoop]: Abstraction has 49 states and 54 transitions. [2022-11-03 04:07:26,198 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 73 states, 73 states have (on average 1.1095890410958904) internal successors, (81), 73 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 04:07:26,199 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 54 transitions. [2022-11-03 04:07:26,199 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-11-03 04:07:26,199 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 04:07:26,199 INFO L195 NwaCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 04:07:26,220 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-11-03 04:07:26,399 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:07:26,400 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 04:07:26,400 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 04:07:26,400 INFO L85 PathProgramCache]: Analyzing trace with hash -1972571246, now seen corresponding path program 18 times [2022-11-03 04:07:26,400 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 04:07:26,400 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1161015016] [2022-11-03 04:07:26,400 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 04:07:26,401 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 04:07:26,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 04:07:28,254 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 04:07:28,254 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 04:07:28,254 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1161015016] [2022-11-03 04:07:28,254 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1161015016] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 04:07:28,255 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1109162335] [2022-11-03 04:07:28,255 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 04:07:28,255 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:07:28,255 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 04:07:28,256 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 04:07:28,257 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-11-03 04:07:28,302 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 04:07:28,303 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 04:07:28,304 WARN L261 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 89 conjunts are in the unsatisfiable core [2022-11-03 04:07:28,306 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 04:07:33,539 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 04:07:33,539 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 04:07:38,075 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 04:07:38,075 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1109162335] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 04:07:38,075 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [259433600] [2022-11-03 04:07:38,076 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-03 04:07:38,077 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 04:07:38,077 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 04:07:38,077 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 04:07:38,077 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 04:07:38,207 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 04:07:40,388 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9891#(and (<= 4 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_correct_version_#res#1| 1) (<= 4 |ULTIMATE.start_student_version_~w#1|) (<= |ULTIMATE.start_main_~is_divisible1~0#1| 1) (<= 4 |ULTIMATE.start_correct_version_~w#1|) (<= 4 |ULTIMATE.start_student_version_#in~w#1|) (<= 0 |ULTIMATE.start_correct_version_~is_divisible~0#1|) (= ~true~0 1) (<= |ULTIMATE.start_correct_version_~is_divisible~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 4 |ULTIMATE.start_correct_version_#in~w#1|) (not (< |ULTIMATE.start_student_version_~i~1#1| |ULTIMATE.start_student_version_~w#1|)) (= ~false~0 0) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (or (and (not (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start_student_version_~is_divisible~1#1| ~false~0)) (and (<= 1 |ULTIMATE.start_student_version_~is_divisible~1#1|) (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|) (<= |ULTIMATE.start_student_version_~is_divisible~1#1| 1))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~is_divisible1~0#1|) (= |ULTIMATE.start_student_version_~is_divisible~1#1| |ULTIMATE.start_student_version_#res#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (= |#NULL.base| 0))' at error location [2022-11-03 04:07:40,388 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 04:07:40,388 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 04:07:40,388 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 105 [2022-11-03 04:07:40,388 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1715204264] [2022-11-03 04:07:40,389 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 04:07:40,389 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 105 states [2022-11-03 04:07:40,389 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 04:07:40,389 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 105 interpolants. [2022-11-03 04:07:40,390 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=478, Invalid=12404, Unknown=0, NotChecked=0, Total=12882 [2022-11-03 04:07:40,390 INFO L87 Difference]: Start difference. First operand 49 states and 54 transitions. Second operand has 105 states, 105 states have (on average 1.0380952380952382) internal successors, (109), 105 states have internal predecessors, (109), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 04:08:18,680 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 04:08:18,680 INFO L93 Difference]: Finished difference Result 152 states and 171 transitions. [2022-11-03 04:08:18,680 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 92 states. [2022-11-03 04:08:18,680 INFO L78 Accepts]: Start accepts. Automaton has has 105 states, 105 states have (on average 1.0380952380952382) internal successors, (109), 105 states have internal predecessors, (109), 0 states have call successors, (0), 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 38 [2022-11-03 04:08:18,680 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 04:08:18,681 INFO L225 Difference]: With dead ends: 152 [2022-11-03 04:08:18,681 INFO L226 Difference]: Without dead ends: 126 [2022-11-03 04:08:18,683 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 224 GetRequests, 36 SyntacticMatches, 1 SemanticMatches, 187 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10340 ImplicationChecksByTransitivity, 45.7s TimeCoverageRelationStatistics Valid=1954, Invalid=33578, Unknown=0, NotChecked=0, Total=35532 [2022-11-03 04:08:18,683 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 192 mSDsluCounter, 108 mSDsCounter, 0 mSdLazyCounter, 2606 mSolverCounterSat, 863 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 192 SdHoareTripleChecker+Valid, 103 SdHoareTripleChecker+Invalid, 3469 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 863 IncrementalHoareTripleChecker+Valid, 2606 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.1s IncrementalHoareTripleChecker+Time [2022-11-03 04:08:18,684 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [192 Valid, 103 Invalid, 3469 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [863 Valid, 2606 Invalid, 0 Unknown, 0 Unchecked, 3.1s Time] [2022-11-03 04:08:18,684 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2022-11-03 04:08:18,879 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 49. [2022-11-03 04:08:18,879 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 48 states have (on average 1.1041666666666667) internal successors, (53), 48 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) [2022-11-03 04:08:18,879 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 53 transitions. [2022-11-03 04:08:18,880 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 53 transitions. Word has length 38 [2022-11-03 04:08:18,880 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 04:08:18,880 INFO L495 AbstractCegarLoop]: Abstraction has 49 states and 53 transitions. [2022-11-03 04:08:18,880 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 105 states, 105 states have (on average 1.0380952380952382) internal successors, (109), 105 states have internal predecessors, (109), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 04:08:18,880 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 53 transitions. [2022-11-03 04:08:18,881 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-11-03 04:08:18,881 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 04:08:18,881 INFO L195 NwaCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 04:08:18,916 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Ended with exit code 0 [2022-11-03 04:08:19,107 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2022-11-03 04:08:19,107 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 04:08:19,107 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 04:08:19,107 INFO L85 PathProgramCache]: Analyzing trace with hash -75648779, now seen corresponding path program 19 times [2022-11-03 04:08:19,107 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 04:08:19,108 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [837978479] [2022-11-03 04:08:19,108 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 04:08:19,108 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 04:08:19,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 04:08:21,109 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 04:08:21,109 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 04:08:21,109 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [837978479] [2022-11-03 04:08:21,110 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [837978479] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 04:08:21,110 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1575005944] [2022-11-03 04:08:21,110 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 04:08:21,110 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:08:21,110 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 04:08:21,111 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 04:08:21,122 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-11-03 04:08:21,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 04:08:21,170 WARN L261 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 93 conjunts are in the unsatisfiable core [2022-11-03 04:08:21,172 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 04:08:26,114 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 04:08:26,115 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 04:08:30,950 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 04:08:30,950 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1575005944] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 04:08:30,950 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2081890287] [2022-11-03 04:08:30,953 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-03 04:08:30,953 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 04:08:30,954 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 04:08:30,954 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 04:08:30,954 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 04:08:31,092 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 04:08:33,308 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10767#(and (<= 4 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_correct_version_#res#1| 1) (<= 4 |ULTIMATE.start_student_version_~w#1|) (<= |ULTIMATE.start_main_~is_divisible1~0#1| 1) (<= 4 |ULTIMATE.start_correct_version_~w#1|) (<= 4 |ULTIMATE.start_student_version_#in~w#1|) (<= 0 |ULTIMATE.start_correct_version_~is_divisible~0#1|) (= ~true~0 1) (<= |ULTIMATE.start_correct_version_~is_divisible~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 4 |ULTIMATE.start_correct_version_#in~w#1|) (not (< |ULTIMATE.start_student_version_~i~1#1| |ULTIMATE.start_student_version_~w#1|)) (= ~false~0 0) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (or (and (not (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start_student_version_~is_divisible~1#1| ~false~0)) (and (<= 1 |ULTIMATE.start_student_version_~is_divisible~1#1|) (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|) (<= |ULTIMATE.start_student_version_~is_divisible~1#1| 1))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~is_divisible1~0#1|) (= |ULTIMATE.start_student_version_~is_divisible~1#1| |ULTIMATE.start_student_version_#res#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (= |#NULL.base| 0))' at error location [2022-11-03 04:08:33,308 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 04:08:33,308 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 04:08:33,309 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 111 [2022-11-03 04:08:33,309 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1804289061] [2022-11-03 04:08:33,309 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 04:08:33,309 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 111 states [2022-11-03 04:08:33,309 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 04:08:33,310 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 111 interpolants. [2022-11-03 04:08:33,310 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=505, Invalid=13775, Unknown=0, NotChecked=0, Total=14280 [2022-11-03 04:08:33,311 INFO L87 Difference]: Start difference. First operand 49 states and 53 transitions. Second operand has 111 states, 111 states have (on average 1.0360360360360361) internal successors, (115), 111 states have internal predecessors, (115), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 04:09:13,773 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 04:09:13,773 INFO L93 Difference]: Finished difference Result 156 states and 176 transitions. [2022-11-03 04:09:13,773 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 97 states. [2022-11-03 04:09:13,774 INFO L78 Accepts]: Start accepts. Automaton has has 111 states, 111 states have (on average 1.0360360360360361) internal successors, (115), 111 states have internal predecessors, (115), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 40 [2022-11-03 04:09:13,774 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 04:09:13,774 INFO L225 Difference]: With dead ends: 156 [2022-11-03 04:09:13,774 INFO L226 Difference]: Without dead ends: 129 [2022-11-03 04:09:13,777 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 236 GetRequests, 38 SyntacticMatches, 1 SemanticMatches, 197 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11507 ImplicationChecksByTransitivity, 47.4s TimeCoverageRelationStatistics Valid=2098, Invalid=37304, Unknown=0, NotChecked=0, Total=39402 [2022-11-03 04:09:13,778 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 196 mSDsluCounter, 136 mSDsCounter, 0 mSdLazyCounter, 3441 mSolverCounterSat, 935 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 196 SdHoareTripleChecker+Valid, 131 SdHoareTripleChecker+Invalid, 4376 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 935 IncrementalHoareTripleChecker+Valid, 3441 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.6s IncrementalHoareTripleChecker+Time [2022-11-03 04:09:13,778 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [196 Valid, 131 Invalid, 4376 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [935 Valid, 3441 Invalid, 0 Unknown, 0 Unchecked, 3.6s Time] [2022-11-03 04:09:13,779 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2022-11-03 04:09:13,951 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 49. [2022-11-03 04:09:13,951 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 48 states have (on average 1.0833333333333333) internal successors, (52), 48 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) [2022-11-03 04:09:13,951 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 52 transitions. [2022-11-03 04:09:13,951 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 52 transitions. Word has length 40 [2022-11-03 04:09:13,952 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 04:09:13,952 INFO L495 AbstractCegarLoop]: Abstraction has 49 states and 52 transitions. [2022-11-03 04:09:13,952 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 111 states, 111 states have (on average 1.0360360360360361) internal successors, (115), 111 states have internal predecessors, (115), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 04:09:13,952 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 52 transitions. [2022-11-03 04:09:13,952 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2022-11-03 04:09:13,952 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 04:09:13,953 INFO L195 NwaCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 04:09:13,985 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2022-11-03 04:09:14,163 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2022-11-03 04:09:14,163 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 04:09:14,163 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 04:09:14,163 INFO L85 PathProgramCache]: Analyzing trace with hash 13500146, now seen corresponding path program 20 times [2022-11-03 04:09:14,164 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 04:09:14,164 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1914951015] [2022-11-03 04:09:14,164 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 04:09:14,164 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 04:09:14,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 04:09:16,335 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 04:09:16,336 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 04:09:16,336 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1914951015] [2022-11-03 04:09:16,336 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1914951015] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 04:09:16,336 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1886876394] [2022-11-03 04:09:16,336 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 04:09:16,336 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:09:16,336 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 04:09:16,337 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 04:09:16,338 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-11-03 04:09:16,394 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2022-11-03 04:09:16,394 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 04:09:16,396 WARN L261 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 99 conjunts are in the unsatisfiable core [2022-11-03 04:09:16,398 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 04:09:22,341 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 04:09:22,341 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 04:09:28,242 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 04:09:28,242 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1886876394] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 04:09:28,243 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [10590977] [2022-11-03 04:09:28,244 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-03 04:09:28,244 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 04:09:28,244 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 04:09:28,245 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 04:09:28,245 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 04:09:28,379 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 04:09:30,735 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11678#(and (<= 4 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_correct_version_#res#1| 1) (<= 4 |ULTIMATE.start_student_version_~w#1|) (<= |ULTIMATE.start_main_~is_divisible1~0#1| 1) (<= 4 |ULTIMATE.start_correct_version_~w#1|) (<= 4 |ULTIMATE.start_student_version_#in~w#1|) (<= 0 |ULTIMATE.start_correct_version_~is_divisible~0#1|) (= ~true~0 1) (<= |ULTIMATE.start_correct_version_~is_divisible~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 4 |ULTIMATE.start_correct_version_#in~w#1|) (not (< |ULTIMATE.start_student_version_~i~1#1| |ULTIMATE.start_student_version_~w#1|)) (= ~false~0 0) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (or (and (not (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start_student_version_~is_divisible~1#1| ~false~0)) (and (<= 1 |ULTIMATE.start_student_version_~is_divisible~1#1|) (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|) (<= |ULTIMATE.start_student_version_~is_divisible~1#1| 1))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~is_divisible1~0#1|) (= |ULTIMATE.start_student_version_~is_divisible~1#1| |ULTIMATE.start_student_version_#res#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (= |#NULL.base| 0))' at error location [2022-11-03 04:09:30,735 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 04:09:30,735 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 04:09:30,735 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41] total 118 [2022-11-03 04:09:30,735 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [363900812] [2022-11-03 04:09:30,736 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 04:09:30,736 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 118 states [2022-11-03 04:09:30,736 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 04:09:30,737 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 118 interpolants. [2022-11-03 04:09:30,738 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=535, Invalid=15467, Unknown=0, NotChecked=0, Total=16002 [2022-11-03 04:09:30,738 INFO L87 Difference]: Start difference. First operand 49 states and 52 transitions. Second operand has 118 states, 118 states have (on average 1.0338983050847457) internal successors, (122), 118 states have internal predecessors, (122), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 04:10:02,681 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 04:10:02,682 INFO L93 Difference]: Finished difference Result 160 states and 181 transitions. [2022-11-03 04:10:02,682 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 102 states. [2022-11-03 04:10:02,682 INFO L78 Accepts]: Start accepts. Automaton has has 118 states, 118 states have (on average 1.0338983050847457) internal successors, (122), 118 states have internal predecessors, (122), 0 states have call successors, (0), 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 42 [2022-11-03 04:10:02,682 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 04:10:02,683 INFO L225 Difference]: With dead ends: 160 [2022-11-03 04:10:02,683 INFO L226 Difference]: Without dead ends: 132 [2022-11-03 04:10:02,686 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 248 GetRequests, 39 SyntacticMatches, 1 SemanticMatches, 208 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12918 ImplicationChecksByTransitivity, 40.6s TimeCoverageRelationStatistics Valid=2251, Invalid=41639, Unknown=0, NotChecked=0, Total=43890 [2022-11-03 04:10:02,687 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 208 mSDsluCounter, 132 mSDsCounter, 0 mSdLazyCounter, 3619 mSolverCounterSat, 1057 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 208 SdHoareTripleChecker+Valid, 129 SdHoareTripleChecker+Invalid, 4676 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1057 IncrementalHoareTripleChecker+Valid, 3619 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.7s IncrementalHoareTripleChecker+Time [2022-11-03 04:10:02,687 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [208 Valid, 129 Invalid, 4676 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1057 Valid, 3619 Invalid, 0 Unknown, 0 Unchecked, 3.7s Time] [2022-11-03 04:10:02,687 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2022-11-03 04:10:02,877 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 49. [2022-11-03 04:10:02,877 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 48 states have (on average 1.0625) internal successors, (51), 48 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 04:10:02,878 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 51 transitions. [2022-11-03 04:10:02,878 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 51 transitions. Word has length 42 [2022-11-03 04:10:02,878 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 04:10:02,878 INFO L495 AbstractCegarLoop]: Abstraction has 49 states and 51 transitions. [2022-11-03 04:10:02,878 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 118 states, 118 states have (on average 1.0338983050847457) internal successors, (122), 118 states have internal predecessors, (122), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 04:10:02,878 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 51 transitions. [2022-11-03 04:10:02,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-11-03 04:10:02,879 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 04:10:02,879 INFO L195 NwaCegarLoop]: trace histogram [17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 04:10:02,902 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2022-11-03 04:10:03,079 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:10:03,079 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 04:10:03,080 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 04:10:03,080 INFO L85 PathProgramCache]: Analyzing trace with hash 217386901, now seen corresponding path program 21 times [2022-11-03 04:10:03,080 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 04:10:03,080 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [170876288] [2022-11-03 04:10:03,080 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 04:10:03,080 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 04:10:03,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 04:10:05,387 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 04:10:05,388 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 04:10:05,388 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [170876288] [2022-11-03 04:10:05,388 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [170876288] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 04:10:05,388 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [94151695] [2022-11-03 04:10:05,388 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 04:10:05,388 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:10:05,388 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 04:10:05,389 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 04:10:05,390 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-11-03 04:10:05,444 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 04:10:05,444 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 04:10:05,446 WARN L261 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 101 conjunts are in the unsatisfiable core [2022-11-03 04:10:05,449 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 04:10:11,566 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 04:10:11,566 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 04:10:17,522 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 04:10:17,522 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [94151695] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 04:10:17,522 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2050226658] [2022-11-03 04:10:17,524 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-03 04:10:17,524 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 04:10:17,524 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 04:10:17,524 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 04:10:17,524 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 04:10:17,668 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 04:10:20,079 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12622#(and (<= 4 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_correct_version_#res#1| 1) (<= 4 |ULTIMATE.start_student_version_~w#1|) (<= |ULTIMATE.start_main_~is_divisible1~0#1| 1) (<= 4 |ULTIMATE.start_correct_version_~w#1|) (<= 4 |ULTIMATE.start_student_version_#in~w#1|) (<= 0 |ULTIMATE.start_correct_version_~is_divisible~0#1|) (= ~true~0 1) (<= |ULTIMATE.start_correct_version_~is_divisible~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 4 |ULTIMATE.start_correct_version_#in~w#1|) (not (< |ULTIMATE.start_student_version_~i~1#1| |ULTIMATE.start_student_version_~w#1|)) (= ~false~0 0) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (or (and (not (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start_student_version_~is_divisible~1#1| ~false~0)) (and (<= 1 |ULTIMATE.start_student_version_~is_divisible~1#1|) (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|) (<= |ULTIMATE.start_student_version_~is_divisible~1#1| 1))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~is_divisible1~0#1|) (= |ULTIMATE.start_student_version_~is_divisible~1#1| |ULTIMATE.start_student_version_#res#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (= |#NULL.base| 0))' at error location [2022-11-03 04:10:20,079 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 04:10:20,080 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 04:10:20,080 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43] total 123 [2022-11-03 04:10:20,080 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [466973178] [2022-11-03 04:10:20,080 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 04:10:20,080 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 123 states [2022-11-03 04:10:20,080 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 04:10:20,081 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 123 interpolants. [2022-11-03 04:10:20,082 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=559, Invalid=16733, Unknown=0, NotChecked=0, Total=17292 [2022-11-03 04:10:20,082 INFO L87 Difference]: Start difference. First operand 49 states and 51 transitions. Second operand has 123 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) [2022-11-03 04:11:08,584 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 04:11:08,584 INFO L93 Difference]: Finished difference Result 142 states and 163 transitions. [2022-11-03 04:11:08,585 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 105 states. [2022-11-03 04:11:08,585 INFO L78 Accepts]: Start accepts. Automaton has has 123 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) Word has length 44 [2022-11-03 04:11:08,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 04:11:08,586 INFO L225 Difference]: With dead ends: 142 [2022-11-03 04:11:08,586 INFO L226 Difference]: Without dead ends: 115 [2022-11-03 04:11:08,589 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 258 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 215 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13744 ImplicationChecksByTransitivity, 57.1s TimeCoverageRelationStatistics Valid=2325, Invalid=44547, Unknown=0, NotChecked=0, Total=46872 [2022-11-03 04:11:08,589 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 183 mSDsluCounter, 171 mSDsCounter, 0 mSdLazyCounter, 4291 mSolverCounterSat, 1093 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 183 SdHoareTripleChecker+Valid, 150 SdHoareTripleChecker+Invalid, 5384 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1093 IncrementalHoareTripleChecker+Valid, 4291 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.4s IncrementalHoareTripleChecker+Time [2022-11-03 04:11:08,590 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [183 Valid, 150 Invalid, 5384 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1093 Valid, 4291 Invalid, 0 Unknown, 0 Unchecked, 4.4s Time] [2022-11-03 04:11:08,590 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2022-11-03 04:11:08,788 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 47. [2022-11-03 04:11:08,788 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 46 states have (on average 1.0434782608695652) internal successors, (48), 46 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 04:11:08,788 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 48 transitions. [2022-11-03 04:11:08,789 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 48 transitions. Word has length 44 [2022-11-03 04:11:08,789 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 04:11:08,789 INFO L495 AbstractCegarLoop]: Abstraction has 47 states and 48 transitions. [2022-11-03 04:11:08,789 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 123 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) [2022-11-03 04:11:08,789 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 48 transitions. [2022-11-03 04:11:08,789 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-11-03 04:11:08,789 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 04:11:08,789 INFO L195 NwaCegarLoop]: trace histogram [18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 04:11:08,813 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2022-11-03 04:11:08,990 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2022-11-03 04:11:08,990 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 04:11:08,990 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 04:11:08,990 INFO L85 PathProgramCache]: Analyzing trace with hash -936250798, now seen corresponding path program 22 times [2022-11-03 04:11:08,991 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 04:11:08,991 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2107043864] [2022-11-03 04:11:08,991 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 04:11:08,991 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 04:11:09,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 04:11:11,511 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 04:11:11,511 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 04:11:11,511 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2107043864] [2022-11-03 04:11:11,512 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2107043864] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 04:11:11,512 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1514266776] [2022-11-03 04:11:11,512 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 04:11:11,512 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:11:11,512 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 04:11:11,513 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 04:11:11,514 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-11-03 04:11:11,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 04:11:11,566 WARN L261 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 105 conjunts are in the unsatisfiable core [2022-11-03 04:11:11,569 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 04:11:18,377 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 04:11:18,378 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 04:11:25,090 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 04:11:25,090 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1514266776] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 04:11:25,090 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1353305073] [2022-11-03 04:11:25,091 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-03 04:11:25,091 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 04:11:25,091 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 04:11:25,092 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 04:11:25,092 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 04:11:25,224 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 04:11:27,872 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13551#(and (<= 4 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_correct_version_#res#1| 1) (<= 4 |ULTIMATE.start_student_version_~w#1|) (<= |ULTIMATE.start_main_~is_divisible1~0#1| 1) (<= 4 |ULTIMATE.start_correct_version_~w#1|) (<= 4 |ULTIMATE.start_student_version_#in~w#1|) (<= 0 |ULTIMATE.start_correct_version_~is_divisible~0#1|) (= ~true~0 1) (<= |ULTIMATE.start_correct_version_~is_divisible~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 4 |ULTIMATE.start_correct_version_#in~w#1|) (not (< |ULTIMATE.start_student_version_~i~1#1| |ULTIMATE.start_student_version_~w#1|)) (= ~false~0 0) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (or (and (not (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start_student_version_~is_divisible~1#1| ~false~0)) (and (<= 1 |ULTIMATE.start_student_version_~is_divisible~1#1|) (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|) (<= |ULTIMATE.start_student_version_~is_divisible~1#1| 1))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~is_divisible1~0#1|) (= |ULTIMATE.start_student_version_~is_divisible~1#1| |ULTIMATE.start_student_version_#res#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (= |#NULL.base| 0))' at error location [2022-11-03 04:11:27,872 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 04:11:27,873 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 04:11:27,873 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 45] total 129 [2022-11-03 04:11:27,873 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1530368323] [2022-11-03 04:11:27,873 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 04:11:27,873 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 129 states [2022-11-03 04:11:27,873 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 04:11:27,874 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 129 interpolants. [2022-11-03 04:11:27,875 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=586, Invalid=18320, Unknown=0, NotChecked=0, Total=18906 [2022-11-03 04:11:27,875 INFO L87 Difference]: Start difference. First operand 47 states and 48 transitions. Second operand has 129 states, 129 states have (on average 1.0310077519379846) internal successors, (133), 129 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 04:12:27,174 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 04:12:27,174 INFO L93 Difference]: Finished difference Result 151 states and 175 transitions. [2022-11-03 04:12:27,175 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 114 states. [2022-11-03 04:12:27,175 INFO L78 Accepts]: Start accepts. Automaton has has 129 states, 129 states have (on average 1.0310077519379846) internal successors, (133), 129 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 46 [2022-11-03 04:12:27,176 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 04:12:27,176 INFO L225 Difference]: With dead ends: 151 [2022-11-03 04:12:27,176 INFO L226 Difference]: Without dead ends: 119 [2022-11-03 04:12:27,179 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 274 GetRequests, 43 SyntacticMatches, 2 SemanticMatches, 229 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15738 ImplicationChecksByTransitivity, 69.2s TimeCoverageRelationStatistics Valid=2593, Invalid=50537, Unknown=0, NotChecked=0, Total=53130 [2022-11-03 04:12:27,179 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 229 mSDsluCounter, 158 mSDsCounter, 0 mSdLazyCounter, 4286 mSolverCounterSat, 1315 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 229 SdHoareTripleChecker+Valid, 154 SdHoareTripleChecker+Invalid, 5601 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1315 IncrementalHoareTripleChecker+Valid, 4286 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.7s IncrementalHoareTripleChecker+Time [2022-11-03 04:12:27,179 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [229 Valid, 154 Invalid, 5601 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1315 Valid, 4286 Invalid, 0 Unknown, 0 Unchecked, 4.7s Time] [2022-11-03 04:12:27,180 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2022-11-03 04:12:27,495 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 70. [2022-11-03 04:12:27,495 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 69 states have (on average 1.3043478260869565) internal successors, (90), 69 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 04:12:27,496 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 90 transitions. [2022-11-03 04:12:27,496 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 90 transitions. Word has length 46 [2022-11-03 04:12:27,496 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 04:12:27,496 INFO L495 AbstractCegarLoop]: Abstraction has 70 states and 90 transitions. [2022-11-03 04:12:27,496 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 129 states, 129 states have (on average 1.0310077519379846) internal successors, (133), 129 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 04:12:27,496 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 90 transitions. [2022-11-03 04:12:27,497 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-11-03 04:12:27,497 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 04:12:27,497 INFO L195 NwaCegarLoop]: trace histogram [19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 04:12:27,524 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2022-11-03 04:12:27,703 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2022-11-03 04:12:27,703 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 04:12:27,703 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 04:12:27,703 INFO L85 PathProgramCache]: Analyzing trace with hash 504858165, now seen corresponding path program 23 times [2022-11-03 04:12:27,703 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 04:12:27,704 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1577959935] [2022-11-03 04:12:27,704 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 04:12:27,704 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 04:12:27,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 04:12:30,438 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 04:12:30,438 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 04:12:30,438 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1577959935] [2022-11-03 04:12:30,439 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1577959935] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 04:12:30,439 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [933701112] [2022-11-03 04:12:30,439 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 04:12:30,439 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:12:30,439 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 04:12:30,440 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 04:12:30,443 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-11-03 04:12:30,503 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2022-11-03 04:12:30,504 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 04:12:30,506 WARN L261 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 111 conjunts are in the unsatisfiable core [2022-11-03 04:12:30,507 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 04:12:37,759 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 04:12:37,759 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 04:12:45,570 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 04:12:45,570 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [933701112] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 04:12:45,570 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1638022955] [2022-11-03 04:12:45,571 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-03 04:12:45,572 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 04:12:45,572 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 04:12:45,572 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 04:12:45,572 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 04:12:45,689 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 04:12:48,308 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '14576#(and (<= 4 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_correct_version_#res#1| 1) (<= 4 |ULTIMATE.start_student_version_~w#1|) (<= |ULTIMATE.start_main_~is_divisible1~0#1| 1) (<= 4 |ULTIMATE.start_correct_version_~w#1|) (<= 4 |ULTIMATE.start_student_version_#in~w#1|) (<= 0 |ULTIMATE.start_correct_version_~is_divisible~0#1|) (= ~true~0 1) (<= |ULTIMATE.start_correct_version_~is_divisible~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 4 |ULTIMATE.start_correct_version_#in~w#1|) (not (< |ULTIMATE.start_student_version_~i~1#1| |ULTIMATE.start_student_version_~w#1|)) (= ~false~0 0) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (or (and (not (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start_student_version_~is_divisible~1#1| ~false~0)) (and (<= 1 |ULTIMATE.start_student_version_~is_divisible~1#1|) (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|) (<= |ULTIMATE.start_student_version_~is_divisible~1#1| 1))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~is_divisible1~0#1|) (= |ULTIMATE.start_student_version_~is_divisible~1#1| |ULTIMATE.start_student_version_#res#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (= |#NULL.base| 0))' at error location [2022-11-03 04:12:48,309 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 04:12:48,309 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 04:12:48,309 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 136 [2022-11-03 04:12:48,309 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [560679002] [2022-11-03 04:12:48,309 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 04:12:48,309 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 136 states [2022-11-03 04:12:48,310 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 04:12:48,310 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 136 interpolants. [2022-11-03 04:12:48,311 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=616, Invalid=20264, Unknown=0, NotChecked=0, Total=20880 [2022-11-03 04:12:48,311 INFO L87 Difference]: Start difference. First operand 70 states and 90 transitions. Second operand has 136 states, 136 states have (on average 1.0294117647058822) internal successors, (140), 136 states have internal predecessors, (140), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 04:13:31,870 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 04:13:31,870 INFO L93 Difference]: Finished difference Result 185 states and 210 transitions. [2022-11-03 04:13:31,870 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 121 states. [2022-11-03 04:13:31,871 INFO L78 Accepts]: Start accepts. Automaton has has 136 states, 136 states have (on average 1.0294117647058822) internal successors, (140), 136 states have internal predecessors, (140), 0 states have call successors, (0), 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 48 [2022-11-03 04:13:31,871 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 04:13:31,871 INFO L225 Difference]: With dead ends: 185 [2022-11-03 04:13:31,871 INFO L226 Difference]: Without dead ends: 152 [2022-11-03 04:13:31,874 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 288 GetRequests, 45 SyntacticMatches, 1 SemanticMatches, 242 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17607 ImplicationChecksByTransitivity, 53.8s TimeCoverageRelationStatistics Valid=2923, Invalid=56369, Unknown=0, NotChecked=0, Total=59292 [2022-11-03 04:13:31,875 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 393 mSDsluCounter, 216 mSDsCounter, 0 mSdLazyCounter, 5214 mSolverCounterSat, 1337 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 393 SdHoareTripleChecker+Valid, 215 SdHoareTripleChecker+Invalid, 6551 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1337 IncrementalHoareTripleChecker+Valid, 5214 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.2s IncrementalHoareTripleChecker+Time [2022-11-03 04:13:31,875 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [393 Valid, 215 Invalid, 6551 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1337 Valid, 5214 Invalid, 0 Unknown, 0 Unchecked, 5.2s Time] [2022-11-03 04:13:31,876 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2022-11-03 04:13:32,422 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 94. [2022-11-03 04:13:32,422 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 93 states have (on average 1.2473118279569892) internal successors, (116), 93 states have internal predecessors, (116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 04:13:32,423 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 116 transitions. [2022-11-03 04:13:32,423 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 116 transitions. Word has length 48 [2022-11-03 04:13:32,423 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 04:13:32,423 INFO L495 AbstractCegarLoop]: Abstraction has 94 states and 116 transitions. [2022-11-03 04:13:32,423 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 136 states, 136 states have (on average 1.0294117647058822) internal successors, (140), 136 states have internal predecessors, (140), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 04:13:32,423 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 116 transitions. [2022-11-03 04:13:32,424 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-11-03 04:13:32,424 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 04:13:32,424 INFO L195 NwaCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 04:13:32,446 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Ended with exit code 0 [2022-11-03 04:13:32,624 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:13:32,624 INFO L420 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 04:13:32,625 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 04:13:32,625 INFO L85 PathProgramCache]: Analyzing trace with hash -446771790, now seen corresponding path program 24 times [2022-11-03 04:13:32,625 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 04:13:32,625 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1273575206] [2022-11-03 04:13:32,625 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 04:13:32,625 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 04:13:32,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 04:13:35,474 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 04:13:35,474 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 04:13:35,474 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1273575206] [2022-11-03 04:13:35,474 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1273575206] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 04:13:35,474 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1920444539] [2022-11-03 04:13:35,474 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 04:13:35,475 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:13:35,475 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 04:13:35,478 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 04:13:35,479 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e3270c5-155b-4c78-8929-74d8f0ee1f0f/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2022-11-03 04:13:35,536 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 04:13:35,536 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 04:13:35,538 WARN L261 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 113 conjunts are in the unsatisfiable core [2022-11-03 04:13:35,539 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 04:13:43,164 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 04:13:43,164 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 04:13:50,692 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 04:13:50,693 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1920444539] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 04:13:50,693 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2035868073] [2022-11-03 04:13:50,694 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-03 04:13:50,694 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 04:13:50,694 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 04:13:50,695 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 04:13:50,695 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 04:13:50,811 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 04:13:53,482 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15738#(and (<= 4 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_correct_version_#res#1| 1) (<= 4 |ULTIMATE.start_student_version_~w#1|) (<= |ULTIMATE.start_main_~is_divisible1~0#1| 1) (<= 4 |ULTIMATE.start_correct_version_~w#1|) (<= 4 |ULTIMATE.start_student_version_#in~w#1|) (<= 0 |ULTIMATE.start_correct_version_~is_divisible~0#1|) (= ~true~0 1) (<= |ULTIMATE.start_correct_version_~is_divisible~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 4 |ULTIMATE.start_correct_version_#in~w#1|) (not (< |ULTIMATE.start_student_version_~i~1#1| |ULTIMATE.start_student_version_~w#1|)) (= ~false~0 0) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (or (and (not (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start_student_version_~is_divisible~1#1| ~false~0)) (and (<= 1 |ULTIMATE.start_student_version_~is_divisible~1#1|) (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|) (<= |ULTIMATE.start_student_version_~is_divisible~1#1| 1))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~is_divisible1~0#1|) (= |ULTIMATE.start_student_version_~is_divisible~1#1| |ULTIMATE.start_student_version_#res#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (= |#NULL.base| 0))' at error location [2022-11-03 04:13:53,482 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 04:13:53,482 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 04:13:53,482 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 141 [2022-11-03 04:13:53,483 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1742225497] [2022-11-03 04:13:53,483 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 04:13:53,483 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 141 states [2022-11-03 04:13:53,483 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 04:13:53,484 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 141 interpolants. [2022-11-03 04:13:53,484 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=640, Invalid=21710, Unknown=0, NotChecked=0, Total=22350 [2022-11-03 04:13:53,485 INFO L87 Difference]: Start difference. First operand 94 states and 116 transitions. Second operand has 141 states, 141 states have (on average 1.0283687943262412) internal successors, (145), 141 states have internal predecessors, (145), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)