./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 2329fc70 Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/config/TaipanReach.xml -i ../../sv-benchmarks/c/loops-crafted-1/watermelon.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh --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-2329fc7 [2022-12-14 13:27:19,475 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-12-14 13:27:19,476 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-12-14 13:27:19,494 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-12-14 13:27:19,495 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-12-14 13:27:19,496 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-12-14 13:27:19,497 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-12-14 13:27:19,498 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-12-14 13:27:19,500 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-12-14 13:27:19,500 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-12-14 13:27:19,501 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-12-14 13:27:19,502 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-12-14 13:27:19,503 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-12-14 13:27:19,504 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-12-14 13:27:19,505 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-12-14 13:27:19,506 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-12-14 13:27:19,507 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-12-14 13:27:19,507 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-12-14 13:27:19,509 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-12-14 13:27:19,510 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-12-14 13:27:19,512 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-12-14 13:27:19,513 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-12-14 13:27:19,514 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-12-14 13:27:19,515 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-12-14 13:27:19,518 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-12-14 13:27:19,518 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-12-14 13:27:19,518 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-12-14 13:27:19,519 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-12-14 13:27:19,520 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-12-14 13:27:19,521 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-12-14 13:27:19,521 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-12-14 13:27:19,521 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-12-14 13:27:19,522 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-12-14 13:27:19,523 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-12-14 13:27:19,524 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-12-14 13:27:19,524 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-12-14 13:27:19,524 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-12-14 13:27:19,525 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-12-14 13:27:19,525 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-12-14 13:27:19,526 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-12-14 13:27:19,526 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-12-14 13:27:19,527 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-12-14 13:27:19,547 INFO L113 SettingsManager]: Loading preferences was successful [2022-12-14 13:27:19,547 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-12-14 13:27:19,547 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-12-14 13:27:19,547 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-12-14 13:27:19,548 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-12-14 13:27:19,548 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-12-14 13:27:19,548 INFO L138 SettingsManager]: * User list type=DISABLED [2022-12-14 13:27:19,548 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-12-14 13:27:19,549 INFO L138 SettingsManager]: * Explicit value domain=true [2022-12-14 13:27:19,549 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-12-14 13:27:19,549 INFO L138 SettingsManager]: * Octagon Domain=false [2022-12-14 13:27:19,549 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-12-14 13:27:19,549 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-12-14 13:27:19,549 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-12-14 13:27:19,550 INFO L138 SettingsManager]: * Interval Domain=false [2022-12-14 13:27:19,550 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-12-14 13:27:19,550 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-12-14 13:27:19,550 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-12-14 13:27:19,551 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-12-14 13:27:19,551 INFO L138 SettingsManager]: * sizeof long=4 [2022-12-14 13:27:19,551 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-12-14 13:27:19,551 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-12-14 13:27:19,551 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-12-14 13:27:19,551 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-12-14 13:27:19,552 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-12-14 13:27:19,552 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-12-14 13:27:19,552 INFO L138 SettingsManager]: * sizeof long double=12 [2022-12-14 13:27:19,552 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-12-14 13:27:19,552 INFO L138 SettingsManager]: * Use constant arrays=true [2022-12-14 13:27:19,552 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-12-14 13:27:19,553 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-12-14 13:27:19,553 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-12-14 13:27:19,553 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 13:27:19,553 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-12-14 13:27:19,553 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-12-14 13:27:19,553 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-12-14 13:27:19,553 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-12-14 13:27:19,554 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-12-14 13:27:19,554 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-12-14 13:27:19,554 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-12-14 13:27:19,554 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-12-14 13:27:19,554 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_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> dda0b992ac1600896503297d86377b482d0a82ded923ea00c7e9ff3fed4db7e7 [2022-12-14 13:27:19,721 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-12-14 13:27:19,737 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-12-14 13:27:19,739 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-12-14 13:27:19,740 INFO L271 PluginConnector]: Initializing CDTParser... [2022-12-14 13:27:19,740 INFO L275 PluginConnector]: CDTParser initialized [2022-12-14 13:27:19,741 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/../../sv-benchmarks/c/loops-crafted-1/watermelon.c [2022-12-14 13:27:22,330 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-12-14 13:27:22,494 INFO L351 CDTParser]: Found 1 translation units. [2022-12-14 13:27:22,495 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/sv-benchmarks/c/loops-crafted-1/watermelon.c [2022-12-14 13:27:22,499 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/data/5db621222/699ea979df4b4c84a964561ce9485c16/FLAG56e7cd2a1 [2022-12-14 13:27:22,509 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/data/5db621222/699ea979df4b4c84a964561ce9485c16 [2022-12-14 13:27:22,511 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-12-14 13:27:22,512 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-12-14 13:27:22,512 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-12-14 13:27:22,512 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-12-14 13:27:22,515 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-12-14 13:27:22,515 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 01:27:22" (1/1) ... [2022-12-14 13:27:22,516 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6e11ec69 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:27:22, skipping insertion in model container [2022-12-14 13:27:22,516 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 01:27:22" (1/1) ... [2022-12-14 13:27:22,522 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-12-14 13:27:22,532 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-12-14 13:27:22,630 WARN L237 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_e5cce19f-2db7-40af-ac00-6ac131385e0d/sv-benchmarks/c/loops-crafted-1/watermelon.c[373,386] [2022-12-14 13:27:22,642 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 13:27:22,651 INFO L203 MainTranslator]: Completed pre-run [2022-12-14 13:27:22,659 WARN L237 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_e5cce19f-2db7-40af-ac00-6ac131385e0d/sv-benchmarks/c/loops-crafted-1/watermelon.c[373,386] [2022-12-14 13:27:22,663 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 13:27:22,673 INFO L208 MainTranslator]: Completed translation [2022-12-14 13:27:22,674 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:27:22 WrapperNode [2022-12-14 13:27:22,674 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-12-14 13:27:22,674 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-12-14 13:27:22,675 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-12-14 13:27:22,675 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-12-14 13:27:22,680 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:27:22" (1/1) ... [2022-12-14 13:27:22,685 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:27:22" (1/1) ... [2022-12-14 13:27:22,698 INFO L138 Inliner]: procedures = 15, calls = 10, calls flagged for inlining = 5, calls inlined = 5, statements flattened = 64 [2022-12-14 13:27:22,698 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-12-14 13:27:22,699 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-12-14 13:27:22,699 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-12-14 13:27:22,699 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-12-14 13:27:22,705 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:27:22" (1/1) ... [2022-12-14 13:27:22,705 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:27:22" (1/1) ... [2022-12-14 13:27:22,706 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:27:22" (1/1) ... [2022-12-14 13:27:22,706 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:27:22" (1/1) ... [2022-12-14 13:27:22,708 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:27:22" (1/1) ... [2022-12-14 13:27:22,710 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:27:22" (1/1) ... [2022-12-14 13:27:22,711 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:27:22" (1/1) ... [2022-12-14 13:27:22,712 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:27:22" (1/1) ... [2022-12-14 13:27:22,713 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-12-14 13:27:22,713 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-12-14 13:27:22,713 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-12-14 13:27:22,713 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-12-14 13:27:22,714 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:27:22" (1/1) ... [2022-12-14 13:27:22,719 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 13:27:22,727 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:27:22,736 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-12-14 13:27:22,738 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-12-14 13:27:22,781 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-12-14 13:27:22,781 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-12-14 13:27:22,781 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-12-14 13:27:22,781 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-12-14 13:27:22,843 INFO L235 CfgBuilder]: Building ICFG [2022-12-14 13:27:22,845 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-12-14 13:27:22,964 INFO L276 CfgBuilder]: Performing block encoding [2022-12-14 13:27:22,997 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-12-14 13:27:22,997 INFO L300 CfgBuilder]: Removed 2 assume(true) statements. [2022-12-14 13:27:22,999 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 01:27:22 BoogieIcfgContainer [2022-12-14 13:27:22,999 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-12-14 13:27:23,002 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-12-14 13:27:23,002 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-12-14 13:27:23,005 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-12-14 13:27:23,005 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.12 01:27:22" (1/3) ... [2022-12-14 13:27:23,006 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@669c3ce7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 01:27:23, skipping insertion in model container [2022-12-14 13:27:23,006 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:27:22" (2/3) ... [2022-12-14 13:27:23,007 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@669c3ce7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 01:27:23, skipping insertion in model container [2022-12-14 13:27:23,007 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 01:27:22" (3/3) ... [2022-12-14 13:27:23,008 INFO L112 eAbstractionObserver]: Analyzing ICFG watermelon.c [2022-12-14 13:27:23,029 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-12-14 13:27:23,029 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-12-14 13:27:23,079 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-12-14 13:27:23,086 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;@fedecc2, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-12-14 13:27:23,086 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-12-14 13:27:23,091 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) [2022-12-14 13:27:23,098 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-12-14 13:27:23,099 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:27:23,099 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:27:23,100 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:27:23,105 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:27:23,105 INFO L85 PathProgramCache]: Analyzing trace with hash 1558471083, now seen corresponding path program 1 times [2022-12-14 13:27:23,115 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:27:23,116 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1239251485] [2022-12-14 13:27:23,116 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:27:23,116 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:27:23,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:27:23,453 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:27:23,454 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:27:23,454 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1239251485] [2022-12-14 13:27:23,455 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1239251485] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 13:27:23,455 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 13:27:23,455 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-12-14 13:27:23,457 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [126598578] [2022-12-14 13:27:23,458 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 13:27:23,462 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-12-14 13:27:23,462 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:27:23,491 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-12-14 13:27:23,491 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2022-12-14 13:27:23,493 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 7 states, 7 states have (on average 1.1428571428571428) 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) [2022-12-14 13:27:23,612 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:27:23,612 INFO L93 Difference]: Finished difference Result 36 states and 41 transitions. [2022-12-14 13:27:23,613 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-12-14 13:27:23,615 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.1428571428571428) 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 [2022-12-14 13:27:23,615 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:27:23,622 INFO L225 Difference]: With dead ends: 36 [2022-12-14 13:27:23,623 INFO L226 Difference]: Without dead ends: 18 [2022-12-14 13:27:23,625 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=48, Invalid=84, Unknown=0, NotChecked=0, Total=132 [2022-12-14 13:27:23,629 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 55 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 58 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 13:27:23,630 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [55 Valid, 35 Invalid, 58 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 56 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 13:27:23,643 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2022-12-14 13:27:23,651 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 13. [2022-12-14 13:27:23,652 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) [2022-12-14 13:27:23,653 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 16 transitions. [2022-12-14 13:27:23,653 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 16 transitions. Word has length 8 [2022-12-14 13:27:23,654 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:27:23,654 INFO L495 AbstractCegarLoop]: Abstraction has 13 states and 16 transitions. [2022-12-14 13:27:23,654 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.1428571428571428) 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) [2022-12-14 13:27:23,654 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 16 transitions. [2022-12-14 13:27:23,654 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-12-14 13:27:23,655 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:27:23,655 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:27:23,655 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-12-14 13:27:23,655 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:27:23,656 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:27:23,656 INFO L85 PathProgramCache]: Analyzing trace with hash 1070096739, now seen corresponding path program 1 times [2022-12-14 13:27:23,656 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:27:23,656 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [377981446] [2022-12-14 13:27:23,656 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:27:23,656 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:27:23,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:27:23,718 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:27:23,718 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:27:23,718 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [377981446] [2022-12-14 13:27:23,719 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [377981446] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 13:27:23,719 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 13:27:23,719 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-12-14 13:27:23,719 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [897752079] [2022-12-14 13:27:23,719 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 13:27:23,720 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-12-14 13:27:23,721 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:27:23,721 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-12-14 13:27:23,721 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 13:27:23,722 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) [2022-12-14 13:27:23,740 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:27:23,740 INFO L93 Difference]: Finished difference Result 18 states and 21 transitions. [2022-12-14 13:27:23,740 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-12-14 13:27:23,740 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 [2022-12-14 13:27:23,741 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:27:23,741 INFO L225 Difference]: With dead ends: 18 [2022-12-14 13:27:23,741 INFO L226 Difference]: Without dead ends: 14 [2022-12-14 13:27:23,742 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 [2022-12-14 13:27:23,743 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 0 mSDsluCounter, 5 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 [2022-12-14 13:27:23,743 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] [2022-12-14 13:27:23,744 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2022-12-14 13:27:23,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2022-12-14 13:27:23,747 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) [2022-12-14 13:27:23,747 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 17 transitions. [2022-12-14 13:27:23,747 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 17 transitions. Word has length 9 [2022-12-14 13:27:23,748 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:27:23,748 INFO L495 AbstractCegarLoop]: Abstraction has 14 states and 17 transitions. [2022-12-14 13:27:23,748 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) [2022-12-14 13:27:23,748 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 17 transitions. [2022-12-14 13:27:23,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-12-14 13:27:23,749 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:27:23,749 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:27:23,749 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-12-14 13:27:23,749 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:27:23,750 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:27:23,750 INFO L85 PathProgramCache]: Analyzing trace with hash -1182757089, now seen corresponding path program 1 times [2022-12-14 13:27:23,750 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:27:23,750 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [623638941] [2022-12-14 13:27:23,750 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:27:23,750 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:27:23,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:27:23,795 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:27:23,795 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:27:23,795 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [623638941] [2022-12-14 13:27:23,795 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [623638941] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 13:27:23,796 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 13:27:23,796 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-12-14 13:27:23,796 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [571990120] [2022-12-14 13:27:23,796 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 13:27:23,796 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-12-14 13:27:23,796 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:27:23,797 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-12-14 13:27:23,797 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 13:27:23,797 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) [2022-12-14 13:27:23,818 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:27:23,818 INFO L93 Difference]: Finished difference Result 23 states and 28 transitions. [2022-12-14 13:27:23,818 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-12-14 13:27:23,819 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 [2022-12-14 13:27:23,819 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:27:23,819 INFO L225 Difference]: With dead ends: 23 [2022-12-14 13:27:23,819 INFO L226 Difference]: Without dead ends: 15 [2022-12-14 13:27:23,819 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 [2022-12-14 13:27:23,821 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 0 mSDsluCounter, 4 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 [2022-12-14 13:27:23,821 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] [2022-12-14 13:27:23,822 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2022-12-14 13:27:23,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2022-12-14 13:27:23,825 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) [2022-12-14 13:27:23,825 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 18 transitions. [2022-12-14 13:27:23,825 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 18 transitions. Word has length 9 [2022-12-14 13:27:23,826 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:27:23,826 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 18 transitions. [2022-12-14 13:27:23,826 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) [2022-12-14 13:27:23,826 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 18 transitions. [2022-12-14 13:27:23,826 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-12-14 13:27:23,826 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:27:23,826 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:27:23,827 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-12-14 13:27:23,827 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:27:23,827 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:27:23,828 INFO L85 PathProgramCache]: Analyzing trace with hash -1193841247, now seen corresponding path program 1 times [2022-12-14 13:27:23,828 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:27:23,828 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1619998296] [2022-12-14 13:27:23,828 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:27:23,828 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:27:23,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:27:23,869 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:27:23,869 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:27:23,869 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1619998296] [2022-12-14 13:27:23,869 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1619998296] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:27:23,869 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [306948225] [2022-12-14 13:27:23,869 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:27:23,870 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:27:23,870 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:27:23,871 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:27:23,872 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-12-14 13:27:23,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:27:23,913 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 6 conjunts are in the unsatisfiable core [2022-12-14 13:27:23,918 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:27:24,133 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 13:27:24,134 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-12-14 13:27:24,134 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [306948225] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 13:27:24,134 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-12-14 13:27:24,134 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [4] total 7 [2022-12-14 13:27:24,134 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1910871888] [2022-12-14 13:27:24,134 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 13:27:24,135 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-12-14 13:27:24,135 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:27:24,135 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-12-14 13:27:24,136 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-12-14 13:27:24,136 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) [2022-12-14 13:27:24,217 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:27:24,217 INFO L93 Difference]: Finished difference Result 25 states and 27 transitions. [2022-12-14 13:27:24,218 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-12-14 13:27:24,218 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 [2022-12-14 13:27:24,218 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:27:24,218 INFO L225 Difference]: With dead ends: 25 [2022-12-14 13:27:24,218 INFO L226 Difference]: Without dead ends: 17 [2022-12-14 13:27:24,219 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 [2022-12-14 13:27:24,220 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 20 mSDsluCounter, 7 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 [2022-12-14 13:27:24,220 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] [2022-12-14 13:27:24,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2022-12-14 13:27:24,223 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 13. [2022-12-14 13:27:24,223 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) [2022-12-14 13:27:24,224 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 15 transitions. [2022-12-14 13:27:24,224 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 15 transitions. Word has length 10 [2022-12-14 13:27:24,224 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:27:24,224 INFO L495 AbstractCegarLoop]: Abstraction has 13 states and 15 transitions. [2022-12-14 13:27:24,224 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) [2022-12-14 13:27:24,224 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 15 transitions. [2022-12-14 13:27:24,224 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-12-14 13:27:24,224 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:27:24,224 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:27:24,230 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-12-14 13:27:24,425 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3 [2022-12-14 13:27:24,426 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:27:24,427 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:27:24,427 INFO L85 PathProgramCache]: Analyzing trace with hash -1434090400, now seen corresponding path program 1 times [2022-12-14 13:27:24,428 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:27:24,428 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1905281970] [2022-12-14 13:27:24,428 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:27:24,429 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:27:24,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:27:24,576 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:27:24,576 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:27:24,577 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1905281970] [2022-12-14 13:27:24,577 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1905281970] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:27:24,577 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [663509858] [2022-12-14 13:27:24,577 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:27:24,577 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:27:24,578 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:27:24,579 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:27:24,580 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-12-14 13:27:24,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:27:24,626 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 4 conjunts are in the unsatisfiable core [2022-12-14 13:27:24,627 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:27:24,648 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:27:24,653 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:27:24,670 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:27:24,671 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [663509858] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:27:24,671 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2084697042] [2022-12-14 13:27:24,686 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 13:27:24,686 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:27:24,689 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:27:24,693 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:27:24,693 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:27:24,871 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:27:25,486 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '369#(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 [2022-12-14 13:27:25,487 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:27:25,487 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:27:25,487 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 8 [2022-12-14 13:27:25,487 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1468573268] [2022-12-14 13:27:25,487 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:27:25,487 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-12-14 13:27:25,488 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:27:25,488 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-12-14 13:27:25,488 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=195, Unknown=0, NotChecked=0, Total=240 [2022-12-14 13:27:25,489 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) [2022-12-14 13:27:25,509 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:27:25,509 INFO L93 Difference]: Finished difference Result 22 states and 26 transitions. [2022-12-14 13:27:25,509 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-12-14 13:27:25,510 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 [2022-12-14 13:27:25,510 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:27:25,510 INFO L225 Difference]: With dead ends: 22 [2022-12-14 13:27:25,510 INFO L226 Difference]: Without dead ends: 14 [2022-12-14 13:27:25,510 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 75 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=45, Invalid=195, Unknown=0, NotChecked=0, Total=240 [2022-12-14 13:27:25,511 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 0 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 13:27:25,512 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 14 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 13:27:25,512 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2022-12-14 13:27:25,515 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2022-12-14 13:27:25,515 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) [2022-12-14 13:27:25,516 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2022-12-14 13:27:25,516 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 10 [2022-12-14 13:27:25,516 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:27:25,516 INFO L495 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2022-12-14 13:27:25,516 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) [2022-12-14 13:27:25,516 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2022-12-14 13:27:25,516 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-12-14 13:27:25,517 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:27:25,517 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:27:25,521 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2022-12-14 13:27:25,717 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:27:25,718 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:27:25,719 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:27:25,719 INFO L85 PathProgramCache]: Analyzing trace with hash -635488449, now seen corresponding path program 2 times [2022-12-14 13:27:25,719 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:27:25,719 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1767184692] [2022-12-14 13:27:25,720 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:27:25,720 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:27:25,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:27:25,946 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-12-14 13:27:25,946 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:27:25,946 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1767184692] [2022-12-14 13:27:25,946 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1767184692] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 13:27:25,946 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 13:27:25,947 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-12-14 13:27:25,947 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [505325561] [2022-12-14 13:27:25,947 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 13:27:25,947 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-12-14 13:27:25,947 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:27:25,948 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-12-14 13:27:25,948 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-12-14 13:27:25,948 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) [2022-12-14 13:27:25,979 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:27:25,979 INFO L93 Difference]: Finished difference Result 18 states and 19 transitions. [2022-12-14 13:27:25,979 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-12-14 13:27:25,980 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 [2022-12-14 13:27:25,980 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:27:25,980 INFO L225 Difference]: With dead ends: 18 [2022-12-14 13:27:25,980 INFO L226 Difference]: Without dead ends: 14 [2022-12-14 13:27:25,980 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2022-12-14 13:27:25,981 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 29 mSDsluCounter, 1 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 4 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 [2022-12-14 13:27:25,982 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [29 Valid, 4 Invalid, 16 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 13:27:25,982 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2022-12-14 13:27:25,987 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2022-12-14 13:27:25,987 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) [2022-12-14 13:27:25,987 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2022-12-14 13:27:25,988 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 11 [2022-12-14 13:27:25,988 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:27:25,988 INFO L495 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2022-12-14 13:27:25,988 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) [2022-12-14 13:27:25,988 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2022-12-14 13:27:25,988 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-12-14 13:27:25,988 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:27:25,989 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:27:25,989 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2022-12-14 13:27:25,989 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:27:25,989 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:27:25,989 INFO L85 PathProgramCache]: Analyzing trace with hash -760009163, now seen corresponding path program 1 times [2022-12-14 13:27:25,989 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:27:25,989 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [346867637] [2022-12-14 13:27:25,990 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:27:25,990 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:27:25,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:27:26,028 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-12-14 13:27:26,029 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:27:26,029 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [346867637] [2022-12-14 13:27:26,029 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [346867637] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:27:26,029 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1308493253] [2022-12-14 13:27:26,029 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:27:26,029 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:27:26,029 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:27:26,030 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:27:26,031 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-12-14 13:27:26,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:27:26,062 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 4 conjunts are in the unsatisfiable core [2022-12-14 13:27:26,063 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:27:26,079 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-12-14 13:27:26,079 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:27:26,092 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-12-14 13:27:26,092 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1308493253] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:27:26,092 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1939574901] [2022-12-14 13:27:26,095 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-12-14 13:27:26,095 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:27:26,095 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:27:26,095 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:27:26,095 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:27:26,270 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:27:26,863 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '566#(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 [2022-12-14 13:27:26,864 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:27:26,864 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:27:26,864 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 8 [2022-12-14 13:27:26,864 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [560112632] [2022-12-14 13:27:26,864 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:27:26,864 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-12-14 13:27:26,865 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:27:26,865 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-12-14 13:27:26,865 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=225, Unknown=0, NotChecked=0, Total=272 [2022-12-14 13:27:26,865 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) [2022-12-14 13:27:26,886 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:27:26,887 INFO L93 Difference]: Finished difference Result 19 states and 20 transitions. [2022-12-14 13:27:26,887 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-12-14 13:27:26,887 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 [2022-12-14 13:27:26,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:27:26,888 INFO L225 Difference]: With dead ends: 19 [2022-12-14 13:27:26,888 INFO L226 Difference]: Without dead ends: 15 [2022-12-14 13:27:26,888 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 84 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=47, Invalid=225, Unknown=0, NotChecked=0, Total=272 [2022-12-14 13:27:26,888 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 0 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 29 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 13:27:26,889 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 17 Invalid, 29 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 13:27:26,889 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2022-12-14 13:27:26,892 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2022-12-14 13:27:26,892 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) [2022-12-14 13:27:26,892 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2022-12-14 13:27:26,892 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 13 [2022-12-14 13:27:26,893 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:27:26,893 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2022-12-14 13:27:26,893 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) [2022-12-14 13:27:26,893 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2022-12-14 13:27:26,893 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-12-14 13:27:26,893 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:27:26,893 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:27:26,897 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2022-12-14 13:27:27,094 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:27:27,095 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:27:27,096 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:27:27,096 INFO L85 PathProgramCache]: Analyzing trace with hash -2092549361, now seen corresponding path program 2 times [2022-12-14 13:27:27,096 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:27:27,097 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1415561400] [2022-12-14 13:27:27,097 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:27:27,097 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:27:27,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:27:27,330 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:27:27,330 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:27:27,330 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1415561400] [2022-12-14 13:27:27,330 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1415561400] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:27:27,330 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1711469208] [2022-12-14 13:27:27,330 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 13:27:27,330 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:27:27,330 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:27:27,331 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:27:27,332 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-12-14 13:27:27,369 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-12-14 13:27:27,369 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:27:27,370 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 30 conjunts are in the unsatisfiable core [2022-12-14 13:27:27,372 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:27:27,504 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:27:27,504 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:27:27,711 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:27:27,711 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1711469208] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:27:27,711 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [366536436] [2022-12-14 13:27:27,713 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-12-14 13:27:27,713 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:27:27,713 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:27:27,713 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:27:27,713 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:27:27,843 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:27:28,545 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '731#(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 [2022-12-14 13:27:28,545 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:27:28,545 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:27:28,545 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 27 [2022-12-14 13:27:28,545 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [167351412] [2022-12-14 13:27:28,545 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:27:28,545 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-12-14 13:27:28,545 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:27:28,546 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-12-14 13:27:28,546 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=157, Invalid=1103, Unknown=0, NotChecked=0, Total=1260 [2022-12-14 13:27:28,546 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand has 27 states, 27 states have (on average 1.3333333333333333) internal successors, (36), 27 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:27:28,828 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:27:28,828 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2022-12-14 13:27:28,828 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-12-14 13:27:28,829 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.3333333333333333) internal successors, (36), 27 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2022-12-14 13:27:28,829 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:27:28,829 INFO L225 Difference]: With dead ends: 30 [2022-12-14 13:27:28,829 INFO L226 Difference]: Without dead ends: 26 [2022-12-14 13:27:28,829 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 745 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=281, Invalid=1699, Unknown=0, NotChecked=0, Total=1980 [2022-12-14 13:27:28,830 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 67 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 129 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 135 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 129 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 13:27:28,830 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [67 Valid, 48 Invalid, 135 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 129 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 13:27:28,830 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2022-12-14 13:27:28,840 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 19. [2022-12-14 13:27:28,840 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) [2022-12-14 13:27:28,841 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2022-12-14 13:27:28,841 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 14 [2022-12-14 13:27:28,841 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:27:28,841 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2022-12-14 13:27:28,841 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 1.3333333333333333) internal successors, (36), 27 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:27:28,841 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2022-12-14 13:27:28,842 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-12-14 13:27:28,842 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:27:28,842 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:27:28,846 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2022-12-14 13:27:29,042 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:27:29,043 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:27:29,044 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:27:29,045 INFO L85 PathProgramCache]: Analyzing trace with hash -451622539, now seen corresponding path program 3 times [2022-12-14 13:27:29,045 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:27:29,046 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [358195956] [2022-12-14 13:27:29,046 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:27:29,047 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:27:29,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:27:29,219 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:27:29,220 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:27:29,220 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [358195956] [2022-12-14 13:27:29,220 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [358195956] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:27:29,220 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [137782091] [2022-12-14 13:27:29,220 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 13:27:29,220 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:27:29,220 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:27:29,221 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:27:29,221 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-12-14 13:27:29,253 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 13:27:29,253 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:27:29,254 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 12 conjunts are in the unsatisfiable core [2022-12-14 13:27:29,255 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:27:29,470 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:27:29,470 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:27:29,636 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:27:29,636 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [137782091] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:27:29,636 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1517290692] [2022-12-14 13:27:29,638 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-12-14 13:27:29,638 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:27:29,638 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:27:29,638 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:27:29,638 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:27:29,758 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:27:30,468 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '941#(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 [2022-12-14 13:27:30,468 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:27:30,468 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:27:30,468 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 23 [2022-12-14 13:27:30,468 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1632245102] [2022-12-14 13:27:30,468 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:27:30,468 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-12-14 13:27:30,469 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:27:30,469 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-12-14 13:27:30,470 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=850, Unknown=0, NotChecked=0, Total=992 [2022-12-14 13:27:30,470 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) [2022-12-14 13:27:30,751 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:27:30,751 INFO L93 Difference]: Finished difference Result 26 states and 28 transitions. [2022-12-14 13:27:30,752 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-12-14 13:27:30,752 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 [2022-12-14 13:27:30,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:27:30,752 INFO L225 Difference]: With dead ends: 26 [2022-12-14 13:27:30,752 INFO L226 Difference]: Without dead ends: 16 [2022-12-14 13:27:30,753 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 19 SyntacticMatches, 5 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 522 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=231, Invalid=1175, Unknown=0, NotChecked=0, Total=1406 [2022-12-14 13:27:30,753 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 44 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 83 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 85 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 83 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 13:27:30,754 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [44 Valid, 20 Invalid, 85 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 83 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 13:27:30,754 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2022-12-14 13:27:30,760 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2022-12-14 13:27:30,761 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) [2022-12-14 13:27:30,761 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2022-12-14 13:27:30,761 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 15 [2022-12-14 13:27:30,761 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:27:30,761 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2022-12-14 13:27:30,761 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) [2022-12-14 13:27:30,762 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2022-12-14 13:27:30,762 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-12-14 13:27:30,762 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:27:30,762 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:27:30,766 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2022-12-14 13:27:30,962 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:27:30,964 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:27:30,965 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:27:30,965 INFO L85 PathProgramCache]: Analyzing trace with hash 385705582, now seen corresponding path program 4 times [2022-12-14 13:27:30,965 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:27:30,965 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [477963257] [2022-12-14 13:27:30,966 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:27:30,966 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:27:30,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:27:31,194 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:27:31,194 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:27:31,194 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [477963257] [2022-12-14 13:27:31,194 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [477963257] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:27:31,194 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [112016282] [2022-12-14 13:27:31,194 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 13:27:31,194 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:27:31,194 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:27:31,195 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:27:31,196 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-12-14 13:27:31,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:27:31,229 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 12 conjunts are in the unsatisfiable core [2022-12-14 13:27:31,229 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:27:31,407 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:27:31,407 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:27:31,571 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:27:31,571 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [112016282] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:27:31,571 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1835207926] [2022-12-14 13:27:31,572 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-12-14 13:27:31,572 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:27:31,572 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:27:31,572 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:27:31,573 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:27:31,686 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:27:32,309 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1136#(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 [2022-12-14 13:27:32,309 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:27:32,309 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:27:32,309 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11, 11] total 24 [2022-12-14 13:27:32,309 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [959496337] [2022-12-14 13:27:32,309 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:27:32,309 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-12-14 13:27:32,310 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:27:32,310 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-12-14 13:27:32,310 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=150, Invalid=906, Unknown=0, NotChecked=0, Total=1056 [2022-12-14 13:27:32,310 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) [2022-12-14 13:27:32,517 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:27:32,518 INFO L93 Difference]: Finished difference Result 21 states and 22 transitions. [2022-12-14 13:27:32,518 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-12-14 13:27:32,518 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 [2022-12-14 13:27:32,518 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:27:32,518 INFO L225 Difference]: With dead ends: 21 [2022-12-14 13:27:32,518 INFO L226 Difference]: Without dead ends: 17 [2022-12-14 13:27:32,519 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 19 SyntacticMatches, 5 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 562 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=252, Invalid=1154, Unknown=0, NotChecked=0, Total=1406 [2022-12-14 13:27:32,520 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 50 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 84 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 84 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 84 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 13:27:32,520 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [50 Valid, 15 Invalid, 84 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 84 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 13:27:32,520 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2022-12-14 13:27:32,524 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2022-12-14 13:27:32,524 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) [2022-12-14 13:27:32,524 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2022-12-14 13:27:32,524 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 15 [2022-12-14 13:27:32,525 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:27:32,525 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2022-12-14 13:27:32,525 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) [2022-12-14 13:27:32,525 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2022-12-14 13:27:32,525 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-12-14 13:27:32,525 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:27:32,525 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:27:32,529 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2022-12-14 13:27:32,726 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-12-14 13:27:32,727 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:27:32,727 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:27:32,728 INFO L85 PathProgramCache]: Analyzing trace with hash -935130634, now seen corresponding path program 5 times [2022-12-14 13:27:32,728 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:27:32,728 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1473881559] [2022-12-14 13:27:32,728 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:27:32,729 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:27:32,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:27:33,320 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:27:33,321 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:27:33,321 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1473881559] [2022-12-14 13:27:33,321 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1473881559] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:27:33,321 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1943541139] [2022-12-14 13:27:33,321 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 13:27:33,321 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:27:33,321 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:27:33,322 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:27:33,322 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-12-14 13:27:33,358 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-12-14 13:27:33,358 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:27:33,360 WARN L261 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 48 conjunts are in the unsatisfiable core [2022-12-14 13:27:33,361 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:27:34,330 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:27:34,330 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:27:34,972 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:27:34,972 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1943541139] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:27:34,972 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1883907752] [2022-12-14 13:27:34,973 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-12-14 13:27:34,973 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:27:34,973 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:27:34,973 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:27:34,974 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:27:35,062 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:27:36,002 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1340#(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 [2022-12-14 13:27:36,002 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:27:36,002 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:27:36,002 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 36 [2022-12-14 13:27:36,002 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1470621707] [2022-12-14 13:27:36,003 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:27:36,003 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2022-12-14 13:27:36,003 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:27:36,003 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2022-12-14 13:27:36,003 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=1840, Unknown=0, NotChecked=0, Total=1980 [2022-12-14 13:27:36,004 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand has 36 states, 36 states have (on average 1.1111111111111112) internal successors, (40), 36 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:27:37,828 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:27:37,829 INFO L93 Difference]: Finished difference Result 31 states and 34 transitions. [2022-12-14 13:27:37,829 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-12-14 13:27:37,829 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 1.1111111111111112) internal successors, (40), 36 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2022-12-14 13:27:37,829 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:27:37,829 INFO L225 Difference]: With dead ends: 31 [2022-12-14 13:27:37,829 INFO L226 Difference]: Without dead ends: 18 [2022-12-14 13:27:37,830 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 641 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=263, Invalid=2599, Unknown=0, NotChecked=0, Total=2862 [2022-12-14 13:27:37,830 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 50 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 399 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 407 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 399 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 13:27:37,830 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [50 Valid, 52 Invalid, 407 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 399 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 13:27:37,831 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2022-12-14 13:27:37,835 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2022-12-14 13:27:37,835 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 17 states have (on average 1.1176470588235294) internal successors, (19), 17 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:27:37,835 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2022-12-14 13:27:37,835 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 16 [2022-12-14 13:27:37,835 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:27:37,835 INFO L495 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2022-12-14 13:27:37,835 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 1.1111111111111112) internal successors, (40), 36 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:27:37,835 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2022-12-14 13:27:37,835 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-12-14 13:27:37,835 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:27:37,836 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:27:37,840 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2022-12-14 13:27:38,036 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:27:38,037 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:27:38,038 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:27:38,038 INFO L85 PathProgramCache]: Analyzing trace with hash 1255987605, now seen corresponding path program 6 times [2022-12-14 13:27:38,038 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:27:38,039 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1087917374] [2022-12-14 13:27:38,039 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:27:38,039 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:27:38,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:27:38,303 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:27:38,303 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:27:38,303 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1087917374] [2022-12-14 13:27:38,303 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1087917374] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:27:38,303 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [270981809] [2022-12-14 13:27:38,303 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 13:27:38,304 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:27:38,304 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:27:38,304 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:27:38,305 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-12-14 13:27:38,336 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 13:27:38,336 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:27:38,337 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 14 conjunts are in the unsatisfiable core [2022-12-14 13:27:38,338 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:27:38,566 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:27:38,566 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:27:38,753 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:27:38,754 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [270981809] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:27:38,754 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [767448687] [2022-12-14 13:27:38,755 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-12-14 13:27:38,755 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:27:38,756 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:27:38,756 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:27:38,756 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:27:38,864 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:27:39,665 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1571#(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 [2022-12-14 13:27:39,665 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:27:39,665 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:27:39,666 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 13] total 29 [2022-12-14 13:27:39,666 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1053481182] [2022-12-14 13:27:39,666 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:27:39,666 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-12-14 13:27:39,666 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:27:39,667 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-12-14 13:27:39,668 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=202, Invalid=1204, Unknown=0, NotChecked=0, Total=1406 [2022-12-14 13:27:39,668 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand has 29 states, 29 states have (on average 1.2758620689655173) internal successors, (37), 29 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:27:39,930 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:27:39,931 INFO L93 Difference]: Finished difference Result 23 states and 24 transitions. [2022-12-14 13:27:39,931 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-12-14 13:27:39,931 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.2758620689655173) internal successors, (37), 29 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2022-12-14 13:27:39,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:27:39,931 INFO L225 Difference]: With dead ends: 23 [2022-12-14 13:27:39,932 INFO L226 Difference]: Without dead ends: 19 [2022-12-14 13:27:39,933 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 21 SyntacticMatches, 6 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 809 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=351, Invalid=1541, Unknown=0, NotChecked=0, Total=1892 [2022-12-14 13:27:39,933 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 53 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 95 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 95 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 95 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 13:27:39,933 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [53 Valid, 15 Invalid, 95 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 95 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 13:27:39,934 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2022-12-14 13:27:39,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2022-12-14 13:27:39,939 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 18 states have (on average 1.1111111111111112) internal successors, (20), 18 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:27:39,939 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2022-12-14 13:27:39,939 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 17 [2022-12-14 13:27:39,939 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:27:39,939 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2022-12-14 13:27:39,940 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.2758620689655173) internal successors, (37), 29 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:27:39,940 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2022-12-14 13:27:39,940 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-12-14 13:27:39,940 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:27:39,940 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:27:39,944 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2022-12-14 13:27:40,140 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:27:40,141 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:27:40,142 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:27:40,142 INFO L85 PathProgramCache]: Analyzing trace with hash 273808303, now seen corresponding path program 7 times [2022-12-14 13:27:40,143 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:27:40,143 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1599551843] [2022-12-14 13:27:40,143 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:27:40,143 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:27:40,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:27:40,834 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:27:40,834 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:27:40,834 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1599551843] [2022-12-14 13:27:40,834 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1599551843] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:27:40,834 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1543951835] [2022-12-14 13:27:40,834 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 13:27:40,834 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:27:40,834 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:27:40,835 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:27:40,836 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-12-14 13:27:40,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:27:40,864 WARN L261 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 50 conjunts are in the unsatisfiable core [2022-12-14 13:27:40,865 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:27:42,160 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:27:42,160 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:27:42,752 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:27:42,753 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1543951835] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:27:42,753 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1865020532] [2022-12-14 13:27:42,754 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-12-14 13:27:42,754 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:27:42,754 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:27:42,754 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:27:42,754 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:27:42,846 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:27:43,778 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1808#(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 [2022-12-14 13:27:43,778 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:27:43,778 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:27:43,779 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 47 [2022-12-14 13:27:43,779 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1625088125] [2022-12-14 13:27:43,779 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:27:43,779 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2022-12-14 13:27:43,779 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:27:43,780 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2022-12-14 13:27:43,781 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=213, Invalid=2867, Unknown=0, NotChecked=0, Total=3080 [2022-12-14 13:27:43,781 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand has 47 states, 47 states have (on average 1.0851063829787233) internal successors, (51), 47 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) [2022-12-14 13:27:45,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:27:45,966 INFO L93 Difference]: Finished difference Result 34 states and 37 transitions. [2022-12-14 13:27:45,967 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-12-14 13:27:45,967 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 1.0851063829787233) internal successors, (51), 47 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) Word has length 18 [2022-12-14 13:27:45,967 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:27:45,967 INFO L225 Difference]: With dead ends: 34 [2022-12-14 13:27:45,967 INFO L226 Difference]: Without dead ends: 20 [2022-12-14 13:27:45,969 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1275 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=373, Invalid=4049, Unknown=0, NotChecked=0, Total=4422 [2022-12-14 13:27:45,970 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 76 mSDsluCounter, 60 mSDsCounter, 0 mSdLazyCounter, 525 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 76 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 533 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 525 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 13:27:45,970 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [76 Valid, 62 Invalid, 533 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 525 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 13:27:45,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2022-12-14 13:27:45,976 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2022-12-14 13:27:45,976 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 19 states have (on average 1.105263157894737) internal successors, (21), 19 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:27:45,976 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2022-12-14 13:27:45,976 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 18 [2022-12-14 13:27:45,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:27:45,976 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2022-12-14 13:27:45,976 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 1.0851063829787233) internal successors, (51), 47 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) [2022-12-14 13:27:45,976 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2022-12-14 13:27:45,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-12-14 13:27:45,977 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:27:45,977 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:27:45,981 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-12-14 13:27:46,177 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-12-14 13:27:46,178 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:27:46,179 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:27:46,179 INFO L85 PathProgramCache]: Analyzing trace with hash 1404460942, now seen corresponding path program 8 times [2022-12-14 13:27:46,180 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:27:46,180 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1833553540] [2022-12-14 13:27:46,180 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:27:46,181 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:27:46,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:27:46,489 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 6 proven. 19 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:27:46,489 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:27:46,489 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1833553540] [2022-12-14 13:27:46,489 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1833553540] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:27:46,489 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1867060574] [2022-12-14 13:27:46,489 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 13:27:46,489 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:27:46,490 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:27:46,490 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:27:46,491 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-12-14 13:27:46,528 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-12-14 13:27:46,528 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:27:46,529 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 16 conjunts are in the unsatisfiable core [2022-12-14 13:27:46,529 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:27:46,813 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:27:46,813 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:27:47,069 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:27:47,069 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1867060574] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:27:47,069 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [840910143] [2022-12-14 13:27:47,071 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-12-14 13:27:47,071 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:27:47,071 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:27:47,071 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:27:47,071 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:27:47,174 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:27:47,919 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2070#(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 [2022-12-14 13:27:47,919 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:27:47,919 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:27:47,919 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 15] total 34 [2022-12-14 13:27:47,919 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2128269435] [2022-12-14 13:27:47,919 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:27:47,919 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2022-12-14 13:27:47,920 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:27:47,920 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2022-12-14 13:27:47,921 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=263, Invalid=1543, Unknown=0, NotChecked=0, Total=1806 [2022-12-14 13:27:47,921 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand has 34 states, 34 states have (on average 1.2352941176470589) internal successors, (42), 34 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:27:48,255 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:27:48,255 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2022-12-14 13:27:48,255 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-12-14 13:27:48,255 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 1.2352941176470589) internal successors, (42), 34 states have internal predecessors, (42), 0 states have call successors, (0), 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 19 [2022-12-14 13:27:48,255 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:27:48,256 INFO L225 Difference]: With dead ends: 25 [2022-12-14 13:27:48,256 INFO L226 Difference]: Without dead ends: 21 [2022-12-14 13:27:48,257 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 23 SyntacticMatches, 7 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1097 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=468, Invalid=1982, Unknown=0, NotChecked=0, Total=2450 [2022-12-14 13:27:48,257 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 70 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 152 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 152 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 152 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 13:27:48,258 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [70 Valid, 24 Invalid, 152 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 152 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 13:27:48,258 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2022-12-14 13:27:48,264 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2022-12-14 13:27:48,264 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 20 states have (on average 1.1) internal successors, (22), 20 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:27:48,264 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2022-12-14 13:27:48,264 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 19 [2022-12-14 13:27:48,264 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:27:48,264 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2022-12-14 13:27:48,264 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 1.2352941176470589) internal successors, (42), 34 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:27:48,264 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2022-12-14 13:27:48,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-12-14 13:27:48,265 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:27:48,265 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:27:48,269 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2022-12-14 13:27:48,465 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-12-14 13:27:48,466 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:27:48,466 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:27:48,467 INFO L85 PathProgramCache]: Analyzing trace with hash 581514454, now seen corresponding path program 9 times [2022-12-14 13:27:48,467 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:27:48,467 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [535145441] [2022-12-14 13:27:48,467 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:27:48,468 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:27:48,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:27:49,154 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:27:49,155 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:27:49,155 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [535145441] [2022-12-14 13:27:49,155 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [535145441] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:27:49,155 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1484311192] [2022-12-14 13:27:49,155 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 13:27:49,155 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:27:49,155 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:27:49,156 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:27:49,157 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-12-14 13:27:49,189 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 13:27:49,189 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:27:49,191 WARN L261 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 56 conjunts are in the unsatisfiable core [2022-12-14 13:27:49,192 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:27:50,368 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:27:50,368 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:27:51,274 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:27:51,274 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1484311192] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:27:51,274 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [204551971] [2022-12-14 13:27:51,275 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-12-14 13:27:51,275 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:27:51,276 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:27:51,276 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:27:51,276 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:27:51,376 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:27:52,381 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2328#(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 [2022-12-14 13:27:52,381 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:27:52,381 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:27:52,381 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 46 [2022-12-14 13:27:52,381 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [830580624] [2022-12-14 13:27:52,381 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:27:52,382 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2022-12-14 13:27:52,382 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:27:52,382 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2022-12-14 13:27:52,384 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=2796, Unknown=0, NotChecked=0, Total=2970 [2022-12-14 13:27:52,384 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand has 46 states, 46 states have (on average 1.0869565217391304) internal successors, (50), 46 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) [2022-12-14 13:27:55,119 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:27:55,119 INFO L93 Difference]: Finished difference Result 37 states and 40 transitions. [2022-12-14 13:27:55,120 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-12-14 13:27:55,120 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 1.0869565217391304) internal successors, (50), 46 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) Word has length 20 [2022-12-14 13:27:55,120 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:27:55,120 INFO L225 Difference]: With dead ends: 37 [2022-12-14 13:27:55,120 INFO L226 Difference]: Without dead ends: 22 [2022-12-14 13:27:55,121 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 22 SyntacticMatches, 2 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1008 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=329, Invalid=3961, Unknown=0, NotChecked=0, Total=4290 [2022-12-14 13:27:55,121 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 75 mSDsluCounter, 60 mSDsCounter, 0 mSdLazyCounter, 618 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 75 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 626 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 618 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-12-14 13:27:55,121 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [75 Valid, 62 Invalid, 626 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 618 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-12-14 13:27:55,122 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2022-12-14 13:27:55,127 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2022-12-14 13:27:55,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 21 states have (on average 1.0952380952380953) internal successors, (23), 21 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:27:55,127 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 23 transitions. [2022-12-14 13:27:55,127 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 23 transitions. Word has length 20 [2022-12-14 13:27:55,127 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:27:55,128 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 23 transitions. [2022-12-14 13:27:55,128 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 1.0869565217391304) internal successors, (50), 46 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) [2022-12-14 13:27:55,128 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 23 transitions. [2022-12-14 13:27:55,128 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-12-14 13:27:55,128 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:27:55,128 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:27:55,132 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2022-12-14 13:27:55,328 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:27:55,329 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:27:55,330 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:27:55,330 INFO L85 PathProgramCache]: Analyzing trace with hash 511974645, now seen corresponding path program 10 times [2022-12-14 13:27:55,330 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:27:55,331 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1035761343] [2022-12-14 13:27:55,331 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:27:55,331 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:27:55,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:27:55,678 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 10 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:27:55,678 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:27:55,678 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1035761343] [2022-12-14 13:27:55,678 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1035761343] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:27:55,678 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [139524688] [2022-12-14 13:27:55,678 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 13:27:55,678 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:27:55,678 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:27:55,679 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:27:55,680 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-12-14 13:27:55,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:27:55,715 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 18 conjunts are in the unsatisfiable core [2022-12-14 13:27:55,716 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:27:56,023 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 15 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:27:56,023 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:27:56,252 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:27:56,253 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [139524688] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:27:56,253 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [231465896] [2022-12-14 13:27:56,254 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-12-14 13:27:56,254 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:27:56,254 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:27:56,255 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:27:56,255 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:27:56,353 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:27:57,152 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2617#(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 [2022-12-14 13:27:57,152 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:27:57,152 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:27:57,152 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17, 17] total 39 [2022-12-14 13:27:57,153 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [372209466] [2022-12-14 13:27:57,153 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:27:57,153 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2022-12-14 13:27:57,153 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:27:57,154 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2022-12-14 13:27:57,155 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=333, Invalid=1923, Unknown=0, NotChecked=0, Total=2256 [2022-12-14 13:27:57,155 INFO L87 Difference]: Start difference. First operand 22 states and 23 transitions. Second operand has 39 states, 39 states have (on average 1.205128205128205) internal successors, (47), 39 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:27:57,490 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:27:57,490 INFO L93 Difference]: Finished difference Result 27 states and 28 transitions. [2022-12-14 13:27:57,490 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-12-14 13:27:57,490 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 1.205128205128205) internal successors, (47), 39 states have internal predecessors, (47), 0 states have call successors, (0), 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 [2022-12-14 13:27:57,490 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:27:57,491 INFO L225 Difference]: With dead ends: 27 [2022-12-14 13:27:57,491 INFO L226 Difference]: Without dead ends: 23 [2022-12-14 13:27:57,492 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 25 SyntacticMatches, 8 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1426 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=603, Invalid=2477, Unknown=0, NotChecked=0, Total=3080 [2022-12-14 13:27:57,492 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 76 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 114 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 76 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 114 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 114 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 13:27:57,492 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [76 Valid, 12 Invalid, 114 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 114 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 13:27:57,493 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2022-12-14 13:27:57,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2022-12-14 13:27:57,499 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 22 states have (on average 1.0909090909090908) internal successors, (24), 22 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:27:57,499 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2022-12-14 13:27:57,499 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 21 [2022-12-14 13:27:57,499 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:27:57,499 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2022-12-14 13:27:57,499 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 1.205128205128205) internal successors, (47), 39 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:27:57,499 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2022-12-14 13:27:57,499 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-12-14 13:27:57,499 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:27:57,499 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:27:57,504 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2022-12-14 13:27:57,700 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-12-14 13:27:57,701 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:27:57,702 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:27:57,702 INFO L85 PathProgramCache]: Analyzing trace with hash -1315756977, now seen corresponding path program 11 times [2022-12-14 13:27:57,702 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:27:57,702 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2084105171] [2022-12-14 13:27:57,703 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:27:57,703 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:27:57,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:27:58,464 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:27:58,464 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:27:58,464 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2084105171] [2022-12-14 13:27:58,464 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2084105171] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:27:58,464 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2096709452] [2022-12-14 13:27:58,464 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 13:27:58,465 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:27:58,465 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:27:58,465 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:27:58,466 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-12-14 13:27:58,498 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-12-14 13:27:58,498 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:27:58,500 WARN L261 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 60 conjunts are in the unsatisfiable core [2022-12-14 13:27:58,502 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:28:00,574 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:28:00,575 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:28:01,875 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:28:01,875 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2096709452] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:28:01,876 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1966373579] [2022-12-14 13:28:01,876 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-12-14 13:28:01,877 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:28:01,877 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:28:01,877 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:28:01,877 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:28:01,981 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:28:03,248 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2902#(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 [2022-12-14 13:28:03,248 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:28:03,248 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:28:03,249 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 51 [2022-12-14 13:28:03,249 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [512200761] [2022-12-14 13:28:03,249 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:28:03,249 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2022-12-14 13:28:03,249 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:28:03,250 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2022-12-14 13:28:03,250 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=191, Invalid=3349, Unknown=0, NotChecked=0, Total=3540 [2022-12-14 13:28:03,250 INFO L87 Difference]: Start difference. First operand 23 states and 24 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) [2022-12-14 13:28:06,757 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:28:06,757 INFO L93 Difference]: Finished difference Result 40 states and 43 transitions. [2022-12-14 13:28:06,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-12-14 13:28:06,757 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 22 [2022-12-14 13:28:06,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:28:06,757 INFO L225 Difference]: With dead ends: 40 [2022-12-14 13:28:06,758 INFO L226 Difference]: Without dead ends: 24 [2022-12-14 13:28:06,758 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 25 SyntacticMatches, 2 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1220 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=362, Invalid=4750, Unknown=0, NotChecked=0, Total=5112 [2022-12-14 13:28:06,759 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 70 mSDsluCounter, 80 mSDsCounter, 0 mSdLazyCounter, 846 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 SdHoareTripleChecker+Valid, 82 SdHoareTripleChecker+Invalid, 854 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 846 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-12-14 13:28:06,759 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [70 Valid, 82 Invalid, 854 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 846 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-12-14 13:28:06,759 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2022-12-14 13:28:06,765 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2022-12-14 13:28:06,765 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 23 states have (on average 1.0869565217391304) internal successors, (25), 23 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:28:06,766 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2022-12-14 13:28:06,766 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 22 [2022-12-14 13:28:06,766 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:28:06,766 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2022-12-14 13:28:06,766 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) [2022-12-14 13:28:06,766 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2022-12-14 13:28:06,767 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-12-14 13:28:06,767 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:28:06,767 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:28:06,771 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2022-12-14 13:28:06,967 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-12-14 13:28:06,968 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:28:06,969 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:28:06,969 INFO L85 PathProgramCache]: Analyzing trace with hash 575963310, now seen corresponding path program 12 times [2022-12-14 13:28:06,969 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:28:06,969 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2119928878] [2022-12-14 13:28:06,970 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:28:06,970 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:28:06,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:28:07,320 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 15 proven. 34 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:28:07,321 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:28:07,321 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2119928878] [2022-12-14 13:28:07,321 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2119928878] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:28:07,321 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [692164741] [2022-12-14 13:28:07,321 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 13:28:07,321 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:28:07,321 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:28:07,322 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:28:07,322 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-12-14 13:28:07,351 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 13:28:07,351 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:28:07,352 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 20 conjunts are in the unsatisfiable core [2022-12-14 13:28:07,353 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:28:07,687 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 21 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:28:07,687 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:28:07,989 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:28:07,989 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [692164741] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:28:07,989 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [710880588] [2022-12-14 13:28:07,990 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-12-14 13:28:07,991 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:28:07,991 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:28:07,991 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:28:07,991 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:28:08,088 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:28:08,708 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3220#(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 [2022-12-14 13:28:08,708 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:28:08,708 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:28:08,708 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19, 19] total 44 [2022-12-14 13:28:08,708 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1323532708] [2022-12-14 13:28:08,708 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:28:08,709 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2022-12-14 13:28:08,709 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:28:08,709 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2022-12-14 13:28:08,710 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=412, Invalid=2344, Unknown=0, NotChecked=0, Total=2756 [2022-12-14 13:28:08,711 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand has 44 states, 44 states have (on average 1.1818181818181819) internal successors, (52), 44 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) [2022-12-14 13:28:09,026 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:28:09,026 INFO L93 Difference]: Finished difference Result 29 states and 30 transitions. [2022-12-14 13:28:09,027 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-12-14 13:28:09,027 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 1.1818181818181819) internal successors, (52), 44 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2022-12-14 13:28:09,027 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:28:09,027 INFO L225 Difference]: With dead ends: 29 [2022-12-14 13:28:09,027 INFO L226 Difference]: Without dead ends: 25 [2022-12-14 13:28:09,029 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 27 SyntacticMatches, 9 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1796 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=756, Invalid=3026, Unknown=0, NotChecked=0, Total=3782 [2022-12-14 13:28:09,029 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 66 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 128 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 128 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 128 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 13:28:09,030 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [66 Valid, 15 Invalid, 128 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 128 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 13:28:09,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2022-12-14 13:28:09,036 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2022-12-14 13:28:09,036 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 24 states have (on average 1.0833333333333333) internal successors, (26), 24 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:28:09,037 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2022-12-14 13:28:09,037 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 23 [2022-12-14 13:28:09,037 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:28:09,037 INFO L495 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2022-12-14 13:28:09,037 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 1.1818181818181819) internal successors, (52), 44 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) [2022-12-14 13:28:09,037 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2022-12-14 13:28:09,038 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-12-14 13:28:09,038 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:28:09,038 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:28:09,041 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2022-12-14 13:28:09,238 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:28:09,239 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:28:09,240 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:28:09,240 INFO L85 PathProgramCache]: Analyzing trace with hash 667891638, now seen corresponding path program 13 times [2022-12-14 13:28:09,241 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:28:09,241 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [925137474] [2022-12-14 13:28:09,241 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:28:09,242 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:28:09,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:28:10,064 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:28:10,064 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:28:10,064 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [925137474] [2022-12-14 13:28:10,064 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [925137474] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:28:10,064 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [165703995] [2022-12-14 13:28:10,065 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 13:28:10,065 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:28:10,065 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:28:10,065 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:28:10,066 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-12-14 13:28:10,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:28:10,101 WARN L261 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 62 conjunts are in the unsatisfiable core [2022-12-14 13:28:10,106 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:28:12,027 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:28:12,027 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:28:13,197 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:28:13,197 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [165703995] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:28:13,197 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1363741032] [2022-12-14 13:28:13,198 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-12-14 13:28:13,198 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:28:13,198 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:28:13,198 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:28:13,198 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:28:13,302 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:28:14,277 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3541#(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 [2022-12-14 13:28:14,278 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:28:14,278 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:28:14,278 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 65 [2022-12-14 13:28:14,278 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [390730122] [2022-12-14 13:28:14,278 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:28:14,278 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 65 states [2022-12-14 13:28:14,278 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:28:14,279 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2022-12-14 13:28:14,279 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=291, Invalid=5111, Unknown=0, NotChecked=0, Total=5402 [2022-12-14 13:28:14,279 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand has 65 states, 65 states have (on average 1.0615384615384615) internal successors, (69), 65 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:28:17,406 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:28:17,407 INFO L93 Difference]: Finished difference Result 43 states and 46 transitions. [2022-12-14 13:28:17,407 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-12-14 13:28:17,407 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 65 states have (on average 1.0615384615384615) internal successors, (69), 65 states have internal predecessors, (69), 0 states have call successors, (0), 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 [2022-12-14 13:28:17,407 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:28:17,407 INFO L225 Difference]: With dead ends: 43 [2022-12-14 13:28:17,407 INFO L226 Difference]: Without dead ends: 26 [2022-12-14 13:28:17,408 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2376 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=502, Invalid=7154, Unknown=0, NotChecked=0, Total=7656 [2022-12-14 13:28:17,409 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 91 mSDsluCounter, 83 mSDsCounter, 0 mSdLazyCounter, 965 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 91 SdHoareTripleChecker+Valid, 85 SdHoareTripleChecker+Invalid, 973 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 965 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-12-14 13:28:17,409 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [91 Valid, 85 Invalid, 973 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 965 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-12-14 13:28:17,410 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2022-12-14 13:28:17,422 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2022-12-14 13:28:17,422 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 25 states have (on average 1.08) internal successors, (27), 25 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:28:17,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 27 transitions. [2022-12-14 13:28:17,423 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 27 transitions. Word has length 24 [2022-12-14 13:28:17,423 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:28:17,423 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 27 transitions. [2022-12-14 13:28:17,423 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 65 states, 65 states have (on average 1.0615384615384615) internal successors, (69), 65 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:28:17,423 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 27 transitions. [2022-12-14 13:28:17,423 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-12-14 13:28:17,423 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:28:17,424 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:28:17,428 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2022-12-14 13:28:17,624 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:28:17,625 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:28:17,625 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:28:17,626 INFO L85 PathProgramCache]: Analyzing trace with hash 1839921237, now seen corresponding path program 14 times [2022-12-14 13:28:17,626 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:28:17,626 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1317650191] [2022-12-14 13:28:17,626 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:28:17,627 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:28:17,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:28:18,156 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 21 proven. 43 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:28:18,156 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:28:18,156 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1317650191] [2022-12-14 13:28:18,156 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1317650191] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:28:18,156 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1920603777] [2022-12-14 13:28:18,156 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 13:28:18,157 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:28:18,157 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:28:18,157 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:28:18,158 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-12-14 13:28:18,194 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-12-14 13:28:18,195 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:28:18,196 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 22 conjunts are in the unsatisfiable core [2022-12-14 13:28:18,197 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:28:18,672 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 28 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:28:18,673 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:28:19,092 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 36 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:28:19,093 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1920603777] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:28:19,093 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1170004974] [2022-12-14 13:28:19,094 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-12-14 13:28:19,094 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:28:19,094 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:28:19,094 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:28:19,094 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:28:19,197 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:28:20,046 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3890#(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 [2022-12-14 13:28:20,046 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:28:20,046 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:28:20,046 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21, 21] total 49 [2022-12-14 13:28:20,046 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2014728496] [2022-12-14 13:28:20,046 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:28:20,047 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2022-12-14 13:28:20,047 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:28:20,047 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2022-12-14 13:28:20,048 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=500, Invalid=2806, Unknown=0, NotChecked=0, Total=3306 [2022-12-14 13:28:20,048 INFO L87 Difference]: Start difference. First operand 26 states and 27 transitions. Second operand has 49 states, 49 states have (on average 1.163265306122449) internal successors, (57), 49 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:28:20,510 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:28:20,510 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2022-12-14 13:28:20,510 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-12-14 13:28:20,511 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 1.163265306122449) internal successors, (57), 49 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 25 [2022-12-14 13:28:20,511 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:28:20,511 INFO L225 Difference]: With dead ends: 31 [2022-12-14 13:28:20,511 INFO L226 Difference]: Without dead ends: 27 [2022-12-14 13:28:20,512 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 29 SyntacticMatches, 10 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2207 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=927, Invalid=3629, Unknown=0, NotChecked=0, Total=4556 [2022-12-14 13:28:20,512 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 69 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 137 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 137 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 137 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 13:28:20,512 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [69 Valid, 15 Invalid, 137 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 137 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 13:28:20,513 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2022-12-14 13:28:20,520 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2022-12-14 13:28:20,521 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) [2022-12-14 13:28:20,521 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2022-12-14 13:28:20,521 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 25 [2022-12-14 13:28:20,521 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:28:20,521 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2022-12-14 13:28:20,521 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 1.163265306122449) internal successors, (57), 49 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:28:20,521 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2022-12-14 13:28:20,521 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-12-14 13:28:20,522 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:28:20,522 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:28:20,525 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2022-12-14 13:28:20,722 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:28:20,723 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:28:20,724 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:28:20,724 INFO L85 PathProgramCache]: Analyzing trace with hash 1195881711, now seen corresponding path program 15 times [2022-12-14 13:28:20,724 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:28:20,725 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [336258980] [2022-12-14 13:28:20,725 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:28:20,725 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:28:20,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:28:21,740 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:28:21,740 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:28:21,740 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [336258980] [2022-12-14 13:28:21,740 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [336258980] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:28:21,740 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1917890787] [2022-12-14 13:28:21,741 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 13:28:21,741 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:28:21,741 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:28:21,741 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:28:21,742 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-12-14 13:28:21,783 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 13:28:21,783 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:28:21,785 WARN L261 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 68 conjunts are in the unsatisfiable core [2022-12-14 13:28:21,787 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:28:23,452 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:28:23,452 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:28:24,890 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:28:24,890 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1917890787] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:28:24,890 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1401123285] [2022-12-14 13:28:24,891 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-12-14 13:28:24,891 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:28:24,891 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:28:24,891 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:28:24,892 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:28:24,983 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:28:26,159 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4229#(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 [2022-12-14 13:28:26,160 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:28:26,160 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:28:26,160 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 61 [2022-12-14 13:28:26,160 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1605083748] [2022-12-14 13:28:26,160 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:28:26,160 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 61 states [2022-12-14 13:28:26,160 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:28:26,161 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2022-12-14 13:28:26,161 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=225, Invalid=4605, Unknown=0, NotChecked=0, Total=4830 [2022-12-14 13:28:26,161 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand has 61 states, 61 states have (on average 1.0655737704918034) internal successors, (65), 61 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:28:30,082 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:28:30,083 INFO L93 Difference]: Finished difference Result 46 states and 49 transitions. [2022-12-14 13:28:30,083 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-12-14 13:28:30,083 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 61 states have (on average 1.0655737704918034) internal successors, (65), 61 states have internal predecessors, (65), 0 states have call successors, (0), 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 [2022-12-14 13:28:30,083 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:28:30,083 INFO L225 Difference]: With dead ends: 46 [2022-12-14 13:28:30,083 INFO L226 Difference]: Without dead ends: 28 [2022-12-14 13:28:30,084 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 31 SyntacticMatches, 2 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1701 ImplicationChecksByTransitivity, 7.1s TimeCoverageRelationStatistics Valid=428, Invalid=6544, Unknown=0, NotChecked=0, Total=6972 [2022-12-14 13:28:30,085 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 76 mSDsluCounter, 94 mSDsCounter, 0 mSdLazyCounter, 1215 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 76 SdHoareTripleChecker+Valid, 96 SdHoareTripleChecker+Invalid, 1223 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 1215 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-12-14 13:28:30,085 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [76 Valid, 96 Invalid, 1223 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 1215 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-12-14 13:28:30,086 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2022-12-14 13:28:30,094 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2022-12-14 13:28:30,094 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 27 states have (on average 1.0740740740740742) internal successors, (29), 27 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:28:30,095 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 29 transitions. [2022-12-14 13:28:30,095 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 29 transitions. Word has length 26 [2022-12-14 13:28:30,095 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:28:30,095 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 29 transitions. [2022-12-14 13:28:30,095 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 61 states, 61 states have (on average 1.0655737704918034) internal successors, (65), 61 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:28:30,095 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 29 transitions. [2022-12-14 13:28:30,095 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-12-14 13:28:30,095 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:28:30,095 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:28:30,100 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-12-14 13:28:30,296 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:28:30,296 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:28:30,297 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:28:30,297 INFO L85 PathProgramCache]: Analyzing trace with hash -2060072498, now seen corresponding path program 16 times [2022-12-14 13:28:30,298 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:28:30,298 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [539359300] [2022-12-14 13:28:30,298 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:28:30,299 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:28:30,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:28:30,858 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 28 proven. 53 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:28:30,858 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:28:30,858 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [539359300] [2022-12-14 13:28:30,858 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [539359300] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:28:30,858 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1298337179] [2022-12-14 13:28:30,858 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 13:28:30,858 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:28:30,858 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:28:30,859 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:28:30,860 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-12-14 13:28:30,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:28:30,899 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 24 conjunts are in the unsatisfiable core [2022-12-14 13:28:30,899 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:28:31,426 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 36 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:28:31,426 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:28:31,925 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 45 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:28:31,925 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1298337179] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:28:31,925 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1890247099] [2022-12-14 13:28:31,926 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-12-14 13:28:31,926 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:28:31,927 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:28:31,927 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:28:31,927 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:28:32,026 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:28:32,819 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4605#(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 [2022-12-14 13:28:32,819 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:28:32,819 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:28:32,819 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23, 23] total 54 [2022-12-14 13:28:32,819 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [941660231] [2022-12-14 13:28:32,819 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:28:32,819 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2022-12-14 13:28:32,819 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:28:32,820 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2022-12-14 13:28:32,820 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=597, Invalid=3309, Unknown=0, NotChecked=0, Total=3906 [2022-12-14 13:28:32,820 INFO L87 Difference]: Start difference. First operand 28 states and 29 transitions. Second operand has 54 states, 54 states have (on average 1.1481481481481481) internal successors, (62), 54 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:28:33,232 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:28:33,232 INFO L93 Difference]: Finished difference Result 33 states and 34 transitions. [2022-12-14 13:28:33,232 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-12-14 13:28:33,232 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 1.1481481481481481) internal successors, (62), 54 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 27 [2022-12-14 13:28:33,232 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:28:33,232 INFO L225 Difference]: With dead ends: 33 [2022-12-14 13:28:33,233 INFO L226 Difference]: Without dead ends: 29 [2022-12-14 13:28:33,233 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 31 SyntacticMatches, 11 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2659 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=1116, Invalid=4286, Unknown=0, NotChecked=0, Total=5402 [2022-12-14 13:28:33,233 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 74 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 175 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 74 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 175 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 175 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 13:28:33,234 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [74 Valid, 15 Invalid, 175 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 175 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 13:28:33,234 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2022-12-14 13:28:33,242 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2022-12-14 13:28:33,242 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 28 states have (on average 1.0714285714285714) internal successors, (30), 28 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:28:33,243 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2022-12-14 13:28:33,243 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 27 [2022-12-14 13:28:33,243 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:28:33,243 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2022-12-14 13:28:33,243 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 54 states have (on average 1.1481481481481481) internal successors, (62), 54 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:28:33,243 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2022-12-14 13:28:33,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-12-14 13:28:33,243 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:28:33,243 INFO L195 NwaCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:28:33,248 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2022-12-14 13:28:33,444 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:28:33,445 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:28:33,445 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:28:33,445 INFO L85 PathProgramCache]: Analyzing trace with hash 555160214, now seen corresponding path program 17 times [2022-12-14 13:28:33,446 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:28:33,446 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1374413738] [2022-12-14 13:28:33,446 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:28:33,446 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:28:33,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:28:34,399 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:28:34,399 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:28:34,399 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1374413738] [2022-12-14 13:28:34,400 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1374413738] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:28:34,400 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1529269826] [2022-12-14 13:28:34,400 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 13:28:34,400 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:28:34,400 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:28:34,401 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:28:34,402 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-12-14 13:28:34,438 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-12-14 13:28:34,438 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:28:34,440 WARN L261 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 72 conjunts are in the unsatisfiable core [2022-12-14 13:28:34,441 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:28:37,594 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:28:37,594 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:28:39,625 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:28:39,625 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1529269826] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:28:39,625 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [108811684] [2022-12-14 13:28:39,626 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-12-14 13:28:39,626 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:28:39,626 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:28:39,626 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:28:39,626 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:28:39,718 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:28:41,032 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4971#(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 [2022-12-14 13:28:41,032 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:28:41,033 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:28:41,033 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 66 [2022-12-14 13:28:41,033 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1893048969] [2022-12-14 13:28:41,033 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:28:41,033 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 66 states [2022-12-14 13:28:41,033 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:28:41,033 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2022-12-14 13:28:41,034 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=242, Invalid=5308, Unknown=0, NotChecked=0, Total=5550 [2022-12-14 13:28:41,034 INFO L87 Difference]: Start difference. First operand 29 states and 30 transitions. Second operand has 66 states, 66 states have (on average 1.0606060606060606) internal successors, (70), 66 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:28:46,326 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:28:46,326 INFO L93 Difference]: Finished difference Result 49 states and 52 transitions. [2022-12-14 13:28:46,326 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-12-14 13:28:46,326 INFO L78 Accepts]: Start accepts. Automaton has has 66 states, 66 states have (on average 1.0606060606060606) internal successors, (70), 66 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2022-12-14 13:28:46,326 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:28:46,326 INFO L225 Difference]: With dead ends: 49 [2022-12-14 13:28:46,326 INFO L226 Difference]: Without dead ends: 30 [2022-12-14 13:28:46,327 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 34 SyntacticMatches, 2 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1970 ImplicationChecksByTransitivity, 10.1s TimeCoverageRelationStatistics Valid=461, Invalid=7549, Unknown=0, NotChecked=0, Total=8010 [2022-12-14 13:28:46,327 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 79 mSDsluCounter, 101 mSDsCounter, 0 mSdLazyCounter, 1375 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 79 SdHoareTripleChecker+Valid, 103 SdHoareTripleChecker+Invalid, 1383 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 1375 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-12-14 13:28:46,328 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [79 Valid, 103 Invalid, 1383 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 1375 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-12-14 13:28:46,328 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2022-12-14 13:28:46,337 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2022-12-14 13:28:46,337 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 29 states have (on average 1.0689655172413792) internal successors, (31), 29 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) [2022-12-14 13:28:46,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2022-12-14 13:28:46,337 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 28 [2022-12-14 13:28:46,338 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:28:46,338 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2022-12-14 13:28:46,338 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 66 states, 66 states have (on average 1.0606060606060606) internal successors, (70), 66 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:28:46,338 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2022-12-14 13:28:46,338 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-12-14 13:28:46,338 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:28:46,338 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:28:46,342 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Ended with exit code 0 [2022-12-14 13:28:46,538 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:28:46,539 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:28:46,540 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:28:46,540 INFO L85 PathProgramCache]: Analyzing trace with hash -1680643147, now seen corresponding path program 18 times [2022-12-14 13:28:46,540 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:28:46,541 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1568416065] [2022-12-14 13:28:46,541 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:28:46,541 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:28:46,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:28:47,119 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 36 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:28:47,119 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:28:47,119 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1568416065] [2022-12-14 13:28:47,119 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1568416065] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:28:47,119 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1259587678] [2022-12-14 13:28:47,119 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 13:28:47,119 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:28:47,119 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:28:47,120 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:28:47,121 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-12-14 13:28:47,153 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 13:28:47,153 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:28:47,154 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 26 conjunts are in the unsatisfiable core [2022-12-14 13:28:47,155 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:28:47,640 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 45 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:28:47,640 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:28:48,095 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 55 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:28:48,095 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1259587678] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:28:48,095 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1331769191] [2022-12-14 13:28:48,096 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-12-14 13:28:48,097 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:28:48,097 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:28:48,097 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:28:48,097 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:28:48,195 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:28:48,977 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5376#(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 [2022-12-14 13:28:48,977 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:28:48,977 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:28:48,977 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25, 25] total 59 [2022-12-14 13:28:48,978 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [408507560] [2022-12-14 13:28:48,978 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:28:48,978 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2022-12-14 13:28:48,978 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:28:48,978 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2022-12-14 13:28:48,979 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=703, Invalid=3853, Unknown=0, NotChecked=0, Total=4556 [2022-12-14 13:28:48,979 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand has 59 states, 59 states have (on average 1.1355932203389831) internal successors, (67), 59 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) [2022-12-14 13:28:49,429 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:28:49,430 INFO L93 Difference]: Finished difference Result 35 states and 36 transitions. [2022-12-14 13:28:49,430 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-12-14 13:28:49,430 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 1.1355932203389831) internal successors, (67), 59 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 29 [2022-12-14 13:28:49,430 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:28:49,430 INFO L225 Difference]: With dead ends: 35 [2022-12-14 13:28:49,430 INFO L226 Difference]: Without dead ends: 31 [2022-12-14 13:28:49,431 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 33 SyntacticMatches, 12 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3152 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=1323, Invalid=4997, Unknown=0, NotChecked=0, Total=6320 [2022-12-14 13:28:49,431 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 42 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 144 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 144 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 144 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 13:28:49,431 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [42 Valid, 9 Invalid, 144 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 144 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 13:28:49,431 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2022-12-14 13:28:49,441 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2022-12-14 13:28:49,441 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 30 states have (on average 1.0666666666666667) internal successors, (32), 30 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:28:49,441 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2022-12-14 13:28:49,441 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 29 [2022-12-14 13:28:49,441 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:28:49,441 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2022-12-14 13:28:49,441 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 59 states, 59 states have (on average 1.1355932203389831) internal successors, (67), 59 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) [2022-12-14 13:28:49,441 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2022-12-14 13:28:49,441 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-12-14 13:28:49,442 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:28:49,442 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:28:49,446 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Ended with exit code 0 [2022-12-14 13:28:49,642 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2022-12-14 13:28:49,643 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:28:49,643 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:28:49,644 INFO L85 PathProgramCache]: Analyzing trace with hash -567431793, now seen corresponding path program 19 times [2022-12-14 13:28:49,644 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:28:49,644 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1734330734] [2022-12-14 13:28:49,644 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:28:49,645 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:28:49,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:28:50,844 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:28:50,844 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:28:50,844 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1734330734] [2022-12-14 13:28:50,844 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1734330734] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:28:50,845 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1922676140] [2022-12-14 13:28:50,845 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 13:28:50,845 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:28:50,845 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:28:50,845 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:28:50,846 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-12-14 13:28:50,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:28:50,885 WARN L261 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 74 conjunts are in the unsatisfiable core [2022-12-14 13:28:50,886 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:28:53,966 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:28:53,966 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:28:55,735 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:28:55,735 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1922676140] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:28:55,735 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1127287284] [2022-12-14 13:28:55,736 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-12-14 13:28:55,737 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:28:55,737 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:28:55,737 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:28:55,737 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:28:55,837 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:28:57,084 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5781#(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 [2022-12-14 13:28:57,084 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:28:57,085 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:28:57,085 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 83 [2022-12-14 13:28:57,085 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1243800736] [2022-12-14 13:28:57,085 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:28:57,085 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 83 states [2022-12-14 13:28:57,085 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:28:57,086 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2022-12-14 13:28:57,086 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=369, Invalid=8003, Unknown=0, NotChecked=0, Total=8372 [2022-12-14 13:28:57,086 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand has 83 states, 83 states have (on average 1.0481927710843373) internal successors, (87), 83 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:29:01,430 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:29:01,430 INFO L93 Difference]: Finished difference Result 52 states and 55 transitions. [2022-12-14 13:29:01,431 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-12-14 13:29:01,431 INFO L78 Accepts]: Start accepts. Automaton has has 83 states, 83 states have (on average 1.0481927710843373) internal successors, (87), 83 states have internal predecessors, (87), 0 states have call successors, (0), 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 [2022-12-14 13:29:01,431 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:29:01,431 INFO L225 Difference]: With dead ends: 52 [2022-12-14 13:29:01,431 INFO L226 Difference]: Without dead ends: 32 [2022-12-14 13:29:01,432 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3801 ImplicationChecksByTransitivity, 9.4s TimeCoverageRelationStatistics Valid=631, Invalid=11141, Unknown=0, NotChecked=0, Total=11772 [2022-12-14 13:29:01,432 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 93 mSDsluCounter, 106 mSDsCounter, 0 mSdLazyCounter, 1533 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 93 SdHoareTripleChecker+Valid, 108 SdHoareTripleChecker+Invalid, 1541 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 1533 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-12-14 13:29:01,432 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [93 Valid, 108 Invalid, 1541 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 1533 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-12-14 13:29:01,433 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2022-12-14 13:29:01,443 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2022-12-14 13:29:01,443 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 31 states have (on average 1.064516129032258) internal successors, (33), 31 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:29:01,443 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 33 transitions. [2022-12-14 13:29:01,443 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 33 transitions. Word has length 30 [2022-12-14 13:29:01,443 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:29:01,443 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 33 transitions. [2022-12-14 13:29:01,444 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 83 states, 83 states have (on average 1.0481927710843373) internal successors, (87), 83 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:29:01,444 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 33 transitions. [2022-12-14 13:29:01,444 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-12-14 13:29:01,444 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:29:01,444 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:29:01,448 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2022-12-14 13:29:01,644 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2022-12-14 13:29:01,645 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:29:01,646 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:29:01,646 INFO L85 PathProgramCache]: Analyzing trace with hash -1690813714, now seen corresponding path program 20 times [2022-12-14 13:29:01,646 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:29:01,647 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [92012342] [2022-12-14 13:29:01,647 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:29:01,648 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:29:01,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:29:02,279 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 45 proven. 76 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:29:02,279 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:29:02,280 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [92012342] [2022-12-14 13:29:02,280 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [92012342] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:29:02,280 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [360464036] [2022-12-14 13:29:02,280 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 13:29:02,280 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:29:02,280 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:29:02,281 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:29:02,282 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-12-14 13:29:02,317 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2022-12-14 13:29:02,318 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:29:02,319 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 28 conjunts are in the unsatisfiable core [2022-12-14 13:29:02,319 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:29:02,940 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 55 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:29:02,940 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:29:03,477 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 66 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:29:03,477 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [360464036] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:29:03,477 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [658171681] [2022-12-14 13:29:03,478 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-12-14 13:29:03,478 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:29:03,478 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:29:03,478 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:29:03,478 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:29:03,584 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:29:04,420 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6217#(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 [2022-12-14 13:29:04,420 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:29:04,420 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:29:04,421 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27, 27] total 64 [2022-12-14 13:29:04,421 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [796116961] [2022-12-14 13:29:04,421 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:29:04,421 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 64 states [2022-12-14 13:29:04,421 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:29:04,421 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2022-12-14 13:29:04,422 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=818, Invalid=4438, Unknown=0, NotChecked=0, Total=5256 [2022-12-14 13:29:04,422 INFO L87 Difference]: Start difference. First operand 32 states and 33 transitions. Second operand has 64 states, 64 states have (on average 1.125) internal successors, (72), 64 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:29:05,035 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:29:05,035 INFO L93 Difference]: Finished difference Result 37 states and 38 transitions. [2022-12-14 13:29:05,036 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-12-14 13:29:05,036 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 64 states have (on average 1.125) internal successors, (72), 64 states have internal predecessors, (72), 0 states have call successors, (0), 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 31 [2022-12-14 13:29:05,036 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:29:05,036 INFO L225 Difference]: With dead ends: 37 [2022-12-14 13:29:05,036 INFO L226 Difference]: Without dead ends: 33 [2022-12-14 13:29:05,037 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 35 SyntacticMatches, 13 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3686 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=1548, Invalid=5762, Unknown=0, NotChecked=0, Total=7310 [2022-12-14 13:29:05,037 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 82 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 205 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 82 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 205 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 205 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 13:29:05,037 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [82 Valid, 18 Invalid, 205 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 205 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 13:29:05,037 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2022-12-14 13:29:05,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2022-12-14 13:29:05,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 32 states have (on average 1.0625) internal successors, (34), 32 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:29:05,051 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2022-12-14 13:29:05,051 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 31 [2022-12-14 13:29:05,051 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:29:05,051 INFO L495 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2022-12-14 13:29:05,051 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 64 states, 64 states have (on average 1.125) internal successors, (72), 64 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:29:05,051 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2022-12-14 13:29:05,051 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-12-14 13:29:05,051 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:29:05,052 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:29:05,055 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Ended with exit code 0 [2022-12-14 13:29:05,252 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:29:05,253 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:29:05,253 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:29:05,253 INFO L85 PathProgramCache]: Analyzing trace with hash -882719370, now seen corresponding path program 21 times [2022-12-14 13:29:05,254 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:29:05,254 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [674302817] [2022-12-14 13:29:05,254 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:29:05,254 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:29:05,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:29:06,532 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:29:06,532 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:29:06,533 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [674302817] [2022-12-14 13:29:06,533 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [674302817] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:29:06,533 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1843238896] [2022-12-14 13:29:06,533 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 13:29:06,533 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:29:06,533 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:29:06,534 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:29:06,534 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-12-14 13:29:06,569 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 13:29:06,569 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:29:06,570 WARN L261 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 80 conjunts are in the unsatisfiable core [2022-12-14 13:29:06,572 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:29:10,496 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:29:10,496 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:29:12,918 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:29:12,918 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1843238896] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:29:12,918 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1380002954] [2022-12-14 13:29:12,919 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-12-14 13:29:12,919 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:29:12,919 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:29:12,919 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:29:12,919 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:29:13,023 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:29:14,716 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6637#(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 [2022-12-14 13:29:14,717 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:29:14,717 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:29:14,717 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 76 [2022-12-14 13:29:14,717 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1423283506] [2022-12-14 13:29:14,717 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:29:14,717 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 76 states [2022-12-14 13:29:14,717 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:29:14,717 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2022-12-14 13:29:14,718 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=276, Invalid=6864, Unknown=0, NotChecked=0, Total=7140 [2022-12-14 13:29:14,718 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand has 76 states, 76 states have (on average 1.0526315789473684) internal successors, (80), 76 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:29:20,567 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:29:20,567 INFO L93 Difference]: Finished difference Result 55 states and 58 transitions. [2022-12-14 13:29:20,567 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-12-14 13:29:20,568 INFO L78 Accepts]: Start accepts. Automaton has has 76 states, 76 states have (on average 1.0526315789473684) internal successors, (80), 76 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 32 [2022-12-14 13:29:20,568 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:29:20,568 INFO L225 Difference]: With dead ends: 55 [2022-12-14 13:29:20,568 INFO L226 Difference]: Without dead ends: 34 [2022-12-14 13:29:20,569 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 40 SyntacticMatches, 2 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2565 ImplicationChecksByTransitivity, 12.2s TimeCoverageRelationStatistics Valid=527, Invalid=9775, Unknown=0, NotChecked=0, Total=10302 [2022-12-14 13:29:20,569 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 103 mSDsluCounter, 97 mSDsCounter, 0 mSdLazyCounter, 1573 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 103 SdHoareTripleChecker+Valid, 99 SdHoareTripleChecker+Invalid, 1581 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 1573 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-12-14 13:29:20,569 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [103 Valid, 99 Invalid, 1581 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 1573 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-12-14 13:29:20,569 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2022-12-14 13:29:20,580 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2022-12-14 13:29:20,580 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 33 states have (on average 1.0606060606060606) internal successors, (35), 33 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:29:20,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 35 transitions. [2022-12-14 13:29:20,581 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 35 transitions. Word has length 32 [2022-12-14 13:29:20,581 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:29:20,581 INFO L495 AbstractCegarLoop]: Abstraction has 34 states and 35 transitions. [2022-12-14 13:29:20,581 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 76 states, 76 states have (on average 1.0526315789473684) internal successors, (80), 76 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:29:20,581 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 35 transitions. [2022-12-14 13:29:20,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-12-14 13:29:20,581 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:29:20,581 INFO L195 NwaCegarLoop]: trace histogram [12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:29:20,585 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Ended with exit code 0 [2022-12-14 13:29:20,782 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2022-12-14 13:29:20,782 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:29:20,783 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:29:20,783 INFO L85 PathProgramCache]: Analyzing trace with hash 1879013141, now seen corresponding path program 22 times [2022-12-14 13:29:20,783 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:29:20,784 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1872902847] [2022-12-14 13:29:20,784 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:29:20,784 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:29:20,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:29:21,406 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 55 proven. 89 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:29:21,406 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:29:21,406 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1872902847] [2022-12-14 13:29:21,406 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1872902847] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:29:21,406 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [414792941] [2022-12-14 13:29:21,406 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 13:29:21,406 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:29:21,406 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:29:21,407 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:29:21,408 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-12-14 13:29:21,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:29:21,440 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 30 conjunts are in the unsatisfiable core [2022-12-14 13:29:21,441 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:29:22,159 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 66 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:29:22,159 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:29:22,788 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 78 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:29:22,788 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [414792941] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:29:22,788 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [826240295] [2022-12-14 13:29:22,789 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-12-14 13:29:22,789 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:29:22,789 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:29:22,789 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:29:22,789 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:29:22,881 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:29:23,652 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7100#(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 [2022-12-14 13:29:23,652 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:29:23,652 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:29:23,653 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29, 29] total 69 [2022-12-14 13:29:23,653 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1443423979] [2022-12-14 13:29:23,653 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:29:23,653 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 69 states [2022-12-14 13:29:23,653 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:29:23,653 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2022-12-14 13:29:23,654 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=942, Invalid=5064, Unknown=0, NotChecked=0, Total=6006 [2022-12-14 13:29:23,654 INFO L87 Difference]: Start difference. First operand 34 states and 35 transitions. Second operand has 69 states, 69 states have (on average 1.1159420289855073) internal successors, (77), 69 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:29:24,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:29:24,218 INFO L93 Difference]: Finished difference Result 39 states and 40 transitions. [2022-12-14 13:29:24,218 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-12-14 13:29:24,219 INFO L78 Accepts]: Start accepts. Automaton has has 69 states, 69 states have (on average 1.1159420289855073) internal successors, (77), 69 states have internal predecessors, (77), 0 states have call successors, (0), 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 33 [2022-12-14 13:29:24,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:29:24,219 INFO L225 Difference]: With dead ends: 39 [2022-12-14 13:29:24,219 INFO L226 Difference]: Without dead ends: 35 [2022-12-14 13:29:24,220 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 37 SyntacticMatches, 14 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4261 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=1791, Invalid=6581, Unknown=0, NotChecked=0, Total=8372 [2022-12-14 13:29:24,220 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 163 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 263 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 163 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 263 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 263 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 13:29:24,220 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [163 Valid, 29 Invalid, 263 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 263 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 13:29:24,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2022-12-14 13:29:24,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2022-12-14 13:29:24,234 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 34 states have (on average 1.0588235294117647) internal successors, (36), 34 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:29:24,234 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2022-12-14 13:29:24,234 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 33 [2022-12-14 13:29:24,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:29:24,234 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 36 transitions. [2022-12-14 13:29:24,234 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 69 states, 69 states have (on average 1.1159420289855073) internal successors, (77), 69 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:29:24,234 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 36 transitions. [2022-12-14 13:29:24,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-12-14 13:29:24,234 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:29:24,234 INFO L195 NwaCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:29:24,239 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Ended with exit code 0 [2022-12-14 13:29:24,435 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2022-12-14 13:29:24,435 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:29:24,436 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:29:24,436 INFO L85 PathProgramCache]: Analyzing trace with hash -1887236561, now seen corresponding path program 23 times [2022-12-14 13:29:24,437 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:29:24,437 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1160893907] [2022-12-14 13:29:24,438 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:29:24,438 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:29:24,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:29:25,883 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:29:25,883 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:29:25,883 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1160893907] [2022-12-14 13:29:25,883 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1160893907] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:29:25,883 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [844831083] [2022-12-14 13:29:25,883 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 13:29:25,883 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:29:25,883 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:29:25,884 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:29:25,885 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-12-14 13:29:25,924 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2022-12-14 13:29:25,924 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:29:25,926 WARN L261 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 86 conjunts are in the unsatisfiable core [2022-12-14 13:29:25,927 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:29:29,011 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:29:29,011 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:29:32,329 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:29:32,329 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [844831083] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:29:32,329 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1600746864] [2022-12-14 13:29:32,330 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-12-14 13:29:32,330 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:29:32,330 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:29:32,330 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:29:32,330 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:29:32,428 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:29:33,993 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7547#(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 [2022-12-14 13:29:33,993 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:29:33,993 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:29:33,993 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 81 [2022-12-14 13:29:33,993 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1827306304] [2022-12-14 13:29:33,993 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:29:33,994 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 81 states [2022-12-14 13:29:33,994 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:29:33,994 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 81 interpolants. [2022-12-14 13:29:33,995 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=338, Invalid=7672, Unknown=0, NotChecked=0, Total=8010 [2022-12-14 13:29:33,995 INFO L87 Difference]: Start difference. First operand 35 states and 36 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) [2022-12-14 13:29:52,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:29:52,018 INFO L93 Difference]: Finished difference Result 115 states and 133 transitions. [2022-12-14 13:29:52,019 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2022-12-14 13:29:52,019 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 34 [2022-12-14 13:29:52,019 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:29:52,021 INFO L225 Difference]: With dead ends: 115 [2022-12-14 13:29:52,021 INFO L226 Difference]: Without dead ends: 89 [2022-12-14 13:29:52,022 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 202 GetRequests, 43 SyntacticMatches, 2 SemanticMatches, 157 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6804 ImplicationChecksByTransitivity, 23.4s TimeCoverageRelationStatistics Valid=1607, Invalid=23515, Unknown=0, NotChecked=0, Total=25122 [2022-12-14 13:29:52,022 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 645 mSDsluCounter, 119 mSDsCounter, 0 mSdLazyCounter, 2369 mSolverCounterSat, 206 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 645 SdHoareTripleChecker+Valid, 121 SdHoareTripleChecker+Invalid, 2575 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 206 IncrementalHoareTripleChecker+Valid, 2369 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2022-12-14 13:29:52,023 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [645 Valid, 121 Invalid, 2575 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [206 Valid, 2369 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2022-12-14 13:29:52,023 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2022-12-14 13:29:52,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 52. [2022-12-14 13:29:52,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 51 states have (on average 1.2941176470588236) internal successors, (66), 51 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) [2022-12-14 13:29:52,054 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 66 transitions. [2022-12-14 13:29:52,054 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 66 transitions. Word has length 34 [2022-12-14 13:29:52,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:29:52,054 INFO L495 AbstractCegarLoop]: Abstraction has 52 states and 66 transitions. [2022-12-14 13:29:52,054 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) [2022-12-14 13:29:52,054 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 66 transitions. [2022-12-14 13:29:52,054 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-12-14 13:29:52,054 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:29:52,054 INFO L195 NwaCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:29:52,058 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Ended with exit code 0 [2022-12-14 13:29:52,255 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:29:52,255 INFO L420 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:29:52,256 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:29:52,256 INFO L85 PathProgramCache]: Analyzing trace with hash 1997819990, now seen corresponding path program 24 times [2022-12-14 13:29:52,257 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:29:52,257 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1127688366] [2022-12-14 13:29:52,257 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:29:52,257 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:29:52,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:29:53,714 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:29:53,714 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:29:53,714 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1127688366] [2022-12-14 13:29:53,714 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1127688366] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:29:53,714 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1045476258] [2022-12-14 13:29:53,714 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 13:29:53,714 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:29:53,714 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:29:53,715 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:29:53,716 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2022-12-14 13:29:53,748 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 13:29:53,748 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:29:53,749 WARN L261 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 88 conjunts are in the unsatisfiable core [2022-12-14 13:29:53,751 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:29:58,111 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:29:58,111 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:30:01,100 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:30:01,100 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1045476258] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:30:01,101 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [609143433] [2022-12-14 13:30:01,102 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-12-14 13:30:01,102 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:30:01,102 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:30:01,102 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:30:01,102 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:30:01,257 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:30:02,706 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8294#(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 [2022-12-14 13:30:02,706 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:30:02,706 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:30:02,706 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 86 [2022-12-14 13:30:02,706 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1112439463] [2022-12-14 13:30:02,706 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:30:02,707 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 86 states [2022-12-14 13:30:02,707 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:30:02,707 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2022-12-14 13:30:02,708 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=310, Invalid=8620, Unknown=0, NotChecked=0, Total=8930 [2022-12-14 13:30:02,708 INFO L87 Difference]: Start difference. First operand 52 states and 66 transitions. Second operand has 86 states, 86 states have (on average 1.0465116279069768) internal successors, (90), 86 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) [2022-12-14 13:30:10,353 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:30:10,353 INFO L93 Difference]: Finished difference Result 75 states and 90 transitions. [2022-12-14 13:30:10,354 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-12-14 13:30:10,354 INFO L78 Accepts]: Start accepts. Automaton has has 86 states, 86 states have (on average 1.0465116279069768) internal successors, (90), 86 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) Word has length 36 [2022-12-14 13:30:10,354 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:30:10,354 INFO L225 Difference]: With dead ends: 75 [2022-12-14 13:30:10,354 INFO L226 Difference]: Without dead ends: 52 [2022-12-14 13:30:10,355 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 46 SyntacticMatches, 2 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3236 ImplicationChecksByTransitivity, 14.4s TimeCoverageRelationStatistics Valid=593, Invalid=12289, Unknown=0, NotChecked=0, Total=12882 [2022-12-14 13:30:10,355 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 124 mSDsluCounter, 116 mSDsCounter, 0 mSdLazyCounter, 2150 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 124 SdHoareTripleChecker+Valid, 118 SdHoareTripleChecker+Invalid, 2158 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 2150 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-12-14 13:30:10,355 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [124 Valid, 118 Invalid, 2158 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 2150 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2022-12-14 13:30:10,355 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2022-12-14 13:30:10,381 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2022-12-14 13:30:10,382 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 51 states have (on average 1.2745098039215685) internal successors, (65), 51 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:30:10,382 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 65 transitions. [2022-12-14 13:30:10,382 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 65 transitions. Word has length 36 [2022-12-14 13:30:10,382 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:30:10,382 INFO L495 AbstractCegarLoop]: Abstraction has 52 states and 65 transitions. [2022-12-14 13:30:10,382 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 86 states, 86 states have (on average 1.0465116279069768) internal successors, (90), 86 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) [2022-12-14 13:30:10,383 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 65 transitions. [2022-12-14 13:30:10,383 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-12-14 13:30:10,383 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:30:10,383 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:30:10,387 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Ended with exit code 0 [2022-12-14 13:30:10,583 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:30:10,584 INFO L420 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:30:10,585 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:30:10,585 INFO L85 PathProgramCache]: Analyzing trace with hash 884021877, now seen corresponding path program 25 times [2022-12-14 13:30:10,586 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:30:10,586 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [251058547] [2022-12-14 13:30:10,586 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:30:10,586 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:30:10,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:30:11,327 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 78 proven. 118 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:30:11,327 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:30:11,327 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [251058547] [2022-12-14 13:30:11,328 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [251058547] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:30:11,328 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [454064979] [2022-12-14 13:30:11,328 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 13:30:11,328 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:30:11,328 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:30:11,328 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:30:11,329 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2022-12-14 13:30:11,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:30:11,361 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 34 conjunts are in the unsatisfiable core [2022-12-14 13:30:11,362 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:30:12,284 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 91 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:30:12,284 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:30:13,000 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 105 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:30:13,000 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [454064979] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:30:13,000 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2107990364] [2022-12-14 13:30:13,001 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-12-14 13:30:13,001 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:30:13,001 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:30:13,001 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:30:13,001 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:30:13,095 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:30:14,115 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8869#(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 [2022-12-14 13:30:14,115 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:30:14,115 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:30:14,115 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 33, 33] total 79 [2022-12-14 13:30:14,115 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1827451899] [2022-12-14 13:30:14,115 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:30:14,116 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 79 states [2022-12-14 13:30:14,116 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:30:14,116 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2022-12-14 13:30:14,117 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1217, Invalid=6439, Unknown=0, NotChecked=0, Total=7656 [2022-12-14 13:30:14,117 INFO L87 Difference]: Start difference. First operand 52 states and 65 transitions. Second operand has 79 states, 79 states have (on average 1.1012658227848102) internal successors, (87), 79 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:30:14,985 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:30:14,985 INFO L93 Difference]: Finished difference Result 70 states and 84 transitions. [2022-12-14 13:30:14,985 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-12-14 13:30:14,986 INFO L78 Accepts]: Start accepts. Automaton has has 79 states, 79 states have (on average 1.1012658227848102) internal successors, (87), 79 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 37 [2022-12-14 13:30:14,986 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:30:14,986 INFO L225 Difference]: With dead ends: 70 [2022-12-14 13:30:14,986 INFO L226 Difference]: Without dead ends: 66 [2022-12-14 13:30:14,986 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 41 SyntacticMatches, 16 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5534 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=2331, Invalid=8381, Unknown=0, NotChecked=0, Total=10712 [2022-12-14 13:30:14,987 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 289 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 200 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 289 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 200 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 200 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 13:30:14,987 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [289 Valid, 15 Invalid, 200 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 200 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 13:30:14,987 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2022-12-14 13:30:15,010 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 39. [2022-12-14 13:30:15,010 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 38 states have (on average 1.0526315789473684) internal successors, (40), 38 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:30:15,011 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2022-12-14 13:30:15,011 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 37 [2022-12-14 13:30:15,011 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:30:15,011 INFO L495 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2022-12-14 13:30:15,011 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 79 states, 79 states have (on average 1.1012658227848102) internal successors, (87), 79 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:30:15,013 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2022-12-14 13:30:15,013 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-12-14 13:30:15,013 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:30:15,013 INFO L195 NwaCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:30:15,017 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Ended with exit code 0 [2022-12-14 13:30:15,213 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2022-12-14 13:30:15,214 INFO L420 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:30:15,214 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:30:15,215 INFO L85 PathProgramCache]: Analyzing trace with hash 1627772623, now seen corresponding path program 26 times [2022-12-14 13:30:15,215 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:30:15,215 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [320671814] [2022-12-14 13:30:15,216 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:30:15,216 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:30:15,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:30:16,710 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:30:16,710 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:30:16,710 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [320671814] [2022-12-14 13:30:16,710 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [320671814] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:30:16,710 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [150098306] [2022-12-14 13:30:16,710 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 13:30:16,710 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:30:16,711 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:30:16,711 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:30:16,712 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2022-12-14 13:30:16,764 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2022-12-14 13:30:16,764 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:30:16,766 WARN L261 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 92 conjunts are in the unsatisfiable core [2022-12-14 13:30:16,768 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:30:20,253 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:30:20,254 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:30:23,532 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:30:23,532 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [150098306] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:30:23,532 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [809819194] [2022-12-14 13:30:23,533 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-12-14 13:30:23,533 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:30:23,533 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:30:23,534 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:30:23,534 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:30:23,659 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:30:25,297 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9423#(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 [2022-12-14 13:30:25,298 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:30:25,298 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:30:25,298 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 91 [2022-12-14 13:30:25,298 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1318540728] [2022-12-14 13:30:25,298 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:30:25,298 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 91 states [2022-12-14 13:30:25,298 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:30:25,298 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 91 interpolants. [2022-12-14 13:30:25,299 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=327, Invalid=9573, Unknown=0, NotChecked=0, Total=9900 [2022-12-14 13:30:25,299 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand has 91 states, 91 states have (on average 1.043956043956044) internal successors, (95), 91 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:30:33,346 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:30:33,346 INFO L93 Difference]: Finished difference Result 64 states and 67 transitions. [2022-12-14 13:30:33,346 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2022-12-14 13:30:33,346 INFO L78 Accepts]: Start accepts. Automaton has has 91 states, 91 states have (on average 1.043956043956044) internal successors, (95), 91 states have internal predecessors, (95), 0 states have call successors, (0), 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 [2022-12-14 13:30:33,347 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:30:33,347 INFO L225 Difference]: With dead ends: 64 [2022-12-14 13:30:33,347 INFO L226 Difference]: Without dead ends: 40 [2022-12-14 13:30:33,347 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 49 SyntacticMatches, 2 SemanticMatches, 118 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3600 ImplicationChecksByTransitivity, 14.2s TimeCoverageRelationStatistics Valid=626, Invalid=13654, Unknown=0, NotChecked=0, Total=14280 [2022-12-14 13:30:33,348 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 109 mSDsluCounter, 133 mSDsCounter, 0 mSdLazyCounter, 2469 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 109 SdHoareTripleChecker+Valid, 135 SdHoareTripleChecker+Invalid, 2477 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 2469 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2022-12-14 13:30:33,348 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [109 Valid, 135 Invalid, 2477 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 2469 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2022-12-14 13:30:33,348 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2022-12-14 13:30:33,373 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2022-12-14 13:30:33,373 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 39 states have (on average 1.0512820512820513) internal successors, (41), 39 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) [2022-12-14 13:30:33,373 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 41 transitions. [2022-12-14 13:30:33,373 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 41 transitions. Word has length 38 [2022-12-14 13:30:33,373 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:30:33,373 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 41 transitions. [2022-12-14 13:30:33,374 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 91 states, 91 states have (on average 1.043956043956044) internal successors, (95), 91 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:30:33,374 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 41 transitions. [2022-12-14 13:30:33,374 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-12-14 13:30:33,374 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:30:33,374 INFO L195 NwaCegarLoop]: trace histogram [15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:30:33,378 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Ended with exit code 0 [2022-12-14 13:30:33,574 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:30:33,575 INFO L420 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:30:33,575 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:30:33,576 INFO L85 PathProgramCache]: Analyzing trace with hash 714642734, now seen corresponding path program 27 times [2022-12-14 13:30:33,576 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:30:33,576 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [42118864] [2022-12-14 13:30:33,576 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:30:33,577 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:30:33,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:30:34,560 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 91 proven. 134 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:30:34,560 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:30:34,560 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [42118864] [2022-12-14 13:30:34,560 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [42118864] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:30:34,560 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1980234250] [2022-12-14 13:30:34,560 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 13:30:34,560 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:30:34,560 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:30:34,561 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:30:34,564 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2022-12-14 13:30:34,597 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 13:30:34,597 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:30:34,598 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 36 conjunts are in the unsatisfiable core [2022-12-14 13:30:34,599 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:30:35,663 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 105 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:30:35,664 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:30:36,711 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 120 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:30:36,711 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1980234250] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:30:36,711 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [800391323] [2022-12-14 13:30:36,712 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-12-14 13:30:36,712 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:30:36,712 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:30:36,712 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:30:36,712 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:30:36,799 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:30:37,777 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9973#(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 [2022-12-14 13:30:37,778 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:30:37,778 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:30:37,778 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 35, 35] total 84 [2022-12-14 13:30:37,778 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [294452686] [2022-12-14 13:30:37,778 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:30:37,778 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 84 states [2022-12-14 13:30:37,778 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:30:37,779 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2022-12-14 13:30:37,779 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1368, Invalid=7188, Unknown=0, NotChecked=0, Total=8556 [2022-12-14 13:30:37,779 INFO L87 Difference]: Start difference. First operand 40 states and 41 transitions. Second operand has 84 states, 84 states have (on average 1.0952380952380953) internal successors, (92), 84 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) [2022-12-14 13:30:38,557 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:30:38,557 INFO L93 Difference]: Finished difference Result 45 states and 46 transitions. [2022-12-14 13:30:38,558 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-12-14 13:30:38,558 INFO L78 Accepts]: Start accepts. Automaton has has 84 states, 84 states have (on average 1.0952380952380953) internal successors, (92), 84 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 39 [2022-12-14 13:30:38,558 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:30:38,558 INFO L225 Difference]: With dead ends: 45 [2022-12-14 13:30:38,558 INFO L226 Difference]: Without dead ends: 41 [2022-12-14 13:30:38,559 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 43 SyntacticMatches, 17 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6232 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=2628, Invalid=9362, Unknown=0, NotChecked=0, Total=11990 [2022-12-14 13:30:38,559 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 232 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 287 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 232 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 287 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 287 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 13:30:38,560 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [232 Valid, 24 Invalid, 287 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 287 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 13:30:38,560 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2022-12-14 13:30:38,588 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2022-12-14 13:30:38,588 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 40 states have (on average 1.05) internal successors, (42), 40 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:30:38,588 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 42 transitions. [2022-12-14 13:30:38,588 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 42 transitions. Word has length 39 [2022-12-14 13:30:38,588 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:30:38,588 INFO L495 AbstractCegarLoop]: Abstraction has 41 states and 42 transitions. [2022-12-14 13:30:38,588 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 84 states, 84 states have (on average 1.0952380952380953) internal successors, (92), 84 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) [2022-12-14 13:30:38,588 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 42 transitions. [2022-12-14 13:30:38,588 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-12-14 13:30:38,589 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:30:38,589 INFO L195 NwaCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:30:38,593 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2022-12-14 13:30:38,789 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:30:38,790 INFO L420 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:30:38,790 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:30:38,791 INFO L85 PathProgramCache]: Analyzing trace with hash 671986486, now seen corresponding path program 28 times [2022-12-14 13:30:38,791 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:30:38,791 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1662352395] [2022-12-14 13:30:38,791 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:30:38,792 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:30:38,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:30:40,564 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:30:40,564 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:30:40,564 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1662352395] [2022-12-14 13:30:40,564 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1662352395] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:30:40,564 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [268963061] [2022-12-14 13:30:40,564 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 13:30:40,564 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:30:40,564 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:30:40,565 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:30:40,566 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2022-12-14 13:30:40,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:30:40,603 WARN L261 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 94 conjunts are in the unsatisfiable core [2022-12-14 13:30:40,604 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:30:44,828 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:30:44,828 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:30:47,577 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:30:47,577 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [268963061] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:30:47,577 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2113114728] [2022-12-14 13:30:47,578 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-12-14 13:30:47,578 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:30:47,578 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:30:47,578 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:30:47,578 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:30:47,673 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:30:49,288 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10518#(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 [2022-12-14 13:30:49,288 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:30:49,288 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:30:49,288 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 113 [2022-12-14 13:30:49,288 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1584719077] [2022-12-14 13:30:49,288 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:30:49,289 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 113 states [2022-12-14 13:30:49,289 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:30:49,290 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 113 interpolants. [2022-12-14 13:30:49,290 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=499, Invalid=14263, Unknown=0, NotChecked=0, Total=14762 [2022-12-14 13:30:49,290 INFO L87 Difference]: Start difference. First operand 41 states and 42 transitions. Second operand has 113 states, 113 states have (on average 1.0353982300884956) internal successors, (117), 113 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:30:57,026 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:30:57,026 INFO L93 Difference]: Finished difference Result 67 states and 70 transitions. [2022-12-14 13:30:57,027 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2022-12-14 13:30:57,027 INFO L78 Accepts]: Start accepts. Automaton has has 113 states, 113 states have (on average 1.0353982300884956) internal successors, (117), 113 states have internal predecessors, (117), 0 states have call successors, (0), 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 [2022-12-14 13:30:57,027 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:30:57,027 INFO L225 Difference]: With dead ends: 67 [2022-12-14 13:30:57,027 INFO L226 Difference]: Without dead ends: 42 [2022-12-14 13:30:57,028 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 179 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 142 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6896 ImplicationChecksByTransitivity, 14.7s TimeCoverageRelationStatistics Valid=846, Invalid=19746, Unknown=0, NotChecked=0, Total=20592 [2022-12-14 13:30:57,028 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 128 mSDsluCounter, 145 mSDsCounter, 0 mSdLazyCounter, 2899 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 128 SdHoareTripleChecker+Valid, 147 SdHoareTripleChecker+Invalid, 2907 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 2899 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2022-12-14 13:30:57,028 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [128 Valid, 147 Invalid, 2907 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 2899 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2022-12-14 13:30:57,029 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2022-12-14 13:30:57,056 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2022-12-14 13:30:57,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 41 states have (on average 1.048780487804878) internal successors, (43), 41 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:30:57,056 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2022-12-14 13:30:57,056 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 40 [2022-12-14 13:30:57,057 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:30:57,057 INFO L495 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2022-12-14 13:30:57,057 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 113 states, 113 states have (on average 1.0353982300884956) internal successors, (117), 113 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:30:57,057 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2022-12-14 13:30:57,057 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-12-14 13:30:57,057 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:30:57,057 INFO L195 NwaCegarLoop]: trace histogram [16, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:30:57,062 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Ended with exit code 0 [2022-12-14 13:30:57,258 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:30:57,258 INFO L420 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:30:57,259 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:30:57,259 INFO L85 PathProgramCache]: Analyzing trace with hash -672508459, now seen corresponding path program 29 times [2022-12-14 13:30:57,260 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:30:57,260 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1634571792] [2022-12-14 13:30:57,260 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:30:57,261 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:30:57,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:30:58,392 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 105 proven. 151 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:30:58,392 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:30:58,392 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1634571792] [2022-12-14 13:30:58,392 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1634571792] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:30:58,392 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1711465891] [2022-12-14 13:30:58,392 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 13:30:58,392 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:30:58,392 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:30:58,393 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:30:58,394 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2022-12-14 13:30:58,432 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2022-12-14 13:30:58,432 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:30:58,434 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 38 conjunts are in the unsatisfiable core [2022-12-14 13:30:58,434 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:30:59,420 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 120 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:30:59,420 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:31:00,233 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 136 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:31:00,233 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1711465891] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:31:00,233 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1839891023] [2022-12-14 13:31:00,234 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-12-14 13:31:00,234 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:31:00,234 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:31:00,234 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:31:00,234 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:31:00,333 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:31:01,145 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11099#(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 [2022-12-14 13:31:01,145 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:31:01,145 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:31:01,145 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 37, 37] total 89 [2022-12-14 13:31:01,145 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1564757373] [2022-12-14 13:31:01,145 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:31:01,146 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 89 states [2022-12-14 13:31:01,146 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:31:01,146 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2022-12-14 13:31:01,146 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1528, Invalid=7978, Unknown=0, NotChecked=0, Total=9506 [2022-12-14 13:31:01,147 INFO L87 Difference]: Start difference. First operand 42 states and 43 transitions. Second operand has 89 states, 89 states have (on average 1.0898876404494382) internal successors, (97), 89 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) [2022-12-14 13:31:01,925 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:31:01,925 INFO L93 Difference]: Finished difference Result 47 states and 48 transitions. [2022-12-14 13:31:01,925 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-12-14 13:31:01,925 INFO L78 Accepts]: Start accepts. Automaton has has 89 states, 89 states have (on average 1.0898876404494382) internal successors, (97), 89 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 41 [2022-12-14 13:31:01,925 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:31:01,925 INFO L225 Difference]: With dead ends: 47 [2022-12-14 13:31:01,926 INFO L226 Difference]: Without dead ends: 43 [2022-12-14 13:31:01,926 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 177 GetRequests, 45 SyntacticMatches, 18 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6971 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=2943, Invalid=10397, Unknown=0, NotChecked=0, Total=13340 [2022-12-14 13:31:01,927 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 172 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 280 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 172 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 280 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 280 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 13:31:01,927 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [172 Valid, 23 Invalid, 280 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 280 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 13:31:01,927 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2022-12-14 13:31:01,955 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2022-12-14 13:31:01,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 42 states have (on average 1.0476190476190477) internal successors, (44), 42 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) [2022-12-14 13:31:01,956 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 44 transitions. [2022-12-14 13:31:01,956 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 44 transitions. Word has length 41 [2022-12-14 13:31:01,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:31:01,956 INFO L495 AbstractCegarLoop]: Abstraction has 43 states and 44 transitions. [2022-12-14 13:31:01,956 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 89 states, 89 states have (on average 1.0898876404494382) internal successors, (97), 89 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) [2022-12-14 13:31:01,956 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 44 transitions. [2022-12-14 13:31:01,956 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2022-12-14 13:31:01,956 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:31:01,957 INFO L195 NwaCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:31:01,960 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Ended with exit code 0 [2022-12-14 13:31:02,157 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2022-12-14 13:31:02,157 INFO L420 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:31:02,157 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:31:02,157 INFO L85 PathProgramCache]: Analyzing trace with hash 619972463, now seen corresponding path program 30 times [2022-12-14 13:31:02,157 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:31:02,158 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2027712435] [2022-12-14 13:31:02,158 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:31:02,158 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:31:02,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:31:03,928 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:31:03,928 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:31:03,928 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2027712435] [2022-12-14 13:31:03,928 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2027712435] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:31:03,928 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1494701440] [2022-12-14 13:31:03,928 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 13:31:03,928 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:31:03,929 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:31:03,929 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:31:03,930 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2022-12-14 13:31:03,965 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 13:31:03,965 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:31:03,967 WARN L261 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 100 conjunts are in the unsatisfiable core [2022-12-14 13:31:03,968 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:31:08,932 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:31:08,932 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:31:12,727 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:31:12,727 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1494701440] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:31:12,727 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1897738378] [2022-12-14 13:31:12,728 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-12-14 13:31:12,728 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:31:12,728 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:31:12,728 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:31:12,728 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:31:12,838 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:31:14,766 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11654#(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 [2022-12-14 13:31:14,766 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:31:14,766 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:31:14,767 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41] total 101 [2022-12-14 13:31:14,767 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [725205010] [2022-12-14 13:31:14,767 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:31:14,767 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 101 states [2022-12-14 13:31:14,767 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:31:14,768 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2022-12-14 13:31:14,768 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=361, Invalid=11629, Unknown=0, NotChecked=0, Total=11990 [2022-12-14 13:31:14,769 INFO L87 Difference]: Start difference. First operand 43 states and 44 transitions. Second operand has 101 states, 101 states have (on average 1.0396039603960396) internal successors, (105), 101 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:31:25,231 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:31:25,231 INFO L93 Difference]: Finished difference Result 70 states and 73 transitions. [2022-12-14 13:31:25,231 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2022-12-14 13:31:25,232 INFO L78 Accepts]: Start accepts. Automaton has has 101 states, 101 states have (on average 1.0396039603960396) internal successors, (105), 101 states have internal predecessors, (105), 0 states have call successors, (0), 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 [2022-12-14 13:31:25,232 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:31:25,232 INFO L225 Difference]: With dead ends: 70 [2022-12-14 13:31:25,232 INFO L226 Difference]: Without dead ends: 44 [2022-12-14 13:31:25,233 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 187 GetRequests, 55 SyntacticMatches, 2 SemanticMatches, 130 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4385 ImplicationChecksByTransitivity, 18.2s TimeCoverageRelationStatistics Valid=692, Invalid=16600, Unknown=0, NotChecked=0, Total=17292 [2022-12-14 13:31:25,233 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 121 mSDsluCounter, 157 mSDsCounter, 0 mSdLazyCounter, 3157 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 121 SdHoareTripleChecker+Valid, 159 SdHoareTripleChecker+Invalid, 3165 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 3157 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2022-12-14 13:31:25,233 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [121 Valid, 159 Invalid, 3165 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 3157 Invalid, 0 Unknown, 0 Unchecked, 2.2s Time] [2022-12-14 13:31:25,233 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-12-14 13:31:25,263 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2022-12-14 13:31:25,264 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 43 states have (on average 1.0465116279069768) internal successors, (45), 43 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:31:25,264 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 45 transitions. [2022-12-14 13:31:25,264 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 45 transitions. Word has length 42 [2022-12-14 13:31:25,264 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:31:25,264 INFO L495 AbstractCegarLoop]: Abstraction has 44 states and 45 transitions. [2022-12-14 13:31:25,264 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 101 states, 101 states have (on average 1.0396039603960396) internal successors, (105), 101 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:31:25,264 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 45 transitions. [2022-12-14 13:31:25,264 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-12-14 13:31:25,265 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:31:25,265 INFO L195 NwaCegarLoop]: trace histogram [17, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:31:25,269 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Ended with exit code 0 [2022-12-14 13:31:25,465 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2022-12-14 13:31:25,466 INFO L420 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:31:25,467 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:31:25,467 INFO L85 PathProgramCache]: Analyzing trace with hash 1345486414, now seen corresponding path program 31 times [2022-12-14 13:31:25,467 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:31:25,468 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [622514600] [2022-12-14 13:31:25,468 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:31:25,468 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:31:25,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:31:26,603 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 120 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:31:26,603 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:31:26,603 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [622514600] [2022-12-14 13:31:26,603 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [622514600] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:31:26,603 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1325142371] [2022-12-14 13:31:26,603 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 13:31:26,603 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:31:26,604 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:31:26,604 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:31:26,605 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2022-12-14 13:31:26,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:31:26,643 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 40 conjunts are in the unsatisfiable core [2022-12-14 13:31:26,644 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:31:27,918 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 136 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:31:27,919 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:31:29,125 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 153 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:31:29,125 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1325142371] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:31:29,125 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [310226691] [2022-12-14 13:31:29,126 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-12-14 13:31:29,126 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:31:29,126 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:31:29,126 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:31:29,126 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:31:29,212 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:31:30,319 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12262#(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 [2022-12-14 13:31:30,320 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:31:30,320 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:31:30,320 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 39, 39] total 94 [2022-12-14 13:31:30,320 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1875156691] [2022-12-14 13:31:30,320 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:31:30,320 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 94 states [2022-12-14 13:31:30,321 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:31:30,321 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 94 interpolants. [2022-12-14 13:31:30,322 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1697, Invalid=8809, Unknown=0, NotChecked=0, Total=10506 [2022-12-14 13:31:30,322 INFO L87 Difference]: Start difference. First operand 44 states and 45 transitions. Second operand has 94 states, 94 states have (on average 1.0851063829787233) internal successors, (102), 94 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:31:31,448 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:31:31,448 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2022-12-14 13:31:31,449 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2022-12-14 13:31:31,449 INFO L78 Accepts]: Start accepts. Automaton has has 94 states, 94 states have (on average 1.0851063829787233) internal successors, (102), 94 states have internal predecessors, (102), 0 states have call successors, (0), 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 43 [2022-12-14 13:31:31,449 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:31:31,449 INFO L225 Difference]: With dead ends: 49 [2022-12-14 13:31:31,449 INFO L226 Difference]: Without dead ends: 45 [2022-12-14 13:31:31,450 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 186 GetRequests, 47 SyntacticMatches, 19 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7751 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=3276, Invalid=11486, Unknown=0, NotChecked=0, Total=14762 [2022-12-14 13:31:31,451 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 80 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 276 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 80 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 276 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 276 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 13:31:31,451 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [80 Valid, 19 Invalid, 276 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 276 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 13:31:31,451 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2022-12-14 13:31:31,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2022-12-14 13:31:31,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 44 states have (on average 1.0454545454545454) internal successors, (46), 44 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) [2022-12-14 13:31:31,483 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2022-12-14 13:31:31,483 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 43 [2022-12-14 13:31:31,483 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:31:31,483 INFO L495 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2022-12-14 13:31:31,483 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 94 states, 94 states have (on average 1.0851063829787233) internal successors, (102), 94 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:31:31,483 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2022-12-14 13:31:31,483 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-12-14 13:31:31,483 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:31:31,484 INFO L195 NwaCegarLoop]: trace histogram [17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:31:31,488 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2022-12-14 13:31:31,684 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36,34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:31:31,685 INFO L420 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:31:31,685 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:31:31,685 INFO L85 PathProgramCache]: Analyzing trace with hash -1246695914, now seen corresponding path program 32 times [2022-12-14 13:31:31,686 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:31:31,686 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [161185612] [2022-12-14 13:31:31,686 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:31:31,687 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:31:31,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:31:34,038 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:31:34,038 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:31:34,038 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [161185612] [2022-12-14 13:31:34,038 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [161185612] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:31:34,038 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2071402479] [2022-12-14 13:31:34,038 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 13:31:34,038 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:31:34,039 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:31:34,039 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:31:34,040 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2022-12-14 13:31:34,080 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2022-12-14 13:31:34,080 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:31:34,082 WARN L261 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 104 conjunts are in the unsatisfiable core [2022-12-14 13:31:34,083 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:31:41,202 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:31:41,202 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:31:46,118 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:31:46,118 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2071402479] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:31:46,118 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [815889684] [2022-12-14 13:31:46,119 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-12-14 13:31:46,119 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:31:46,119 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:31:46,119 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:31:46,119 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:31:46,210 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:31:48,223 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12844#(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 [2022-12-14 13:31:48,223 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:31:48,223 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:31:48,223 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43] total 106 [2022-12-14 13:31:48,223 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1860831234] [2022-12-14 13:31:48,224 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:31:48,224 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 106 states [2022-12-14 13:31:48,224 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:31:48,225 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 106 interpolants. [2022-12-14 13:31:48,225 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=378, Invalid=12732, Unknown=0, NotChecked=0, Total=13110 [2022-12-14 13:31:48,225 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand has 106 states, 106 states have (on average 1.0377358490566038) internal successors, (110), 106 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:31:59,031 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:31:59,031 INFO L93 Difference]: Finished difference Result 73 states and 76 transitions. [2022-12-14 13:31:59,031 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2022-12-14 13:31:59,031 INFO L78 Accepts]: Start accepts. Automaton has has 106 states, 106 states have (on average 1.0377358490566038) internal successors, (110), 106 states have internal predecessors, (110), 0 states have call successors, (0), 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 [2022-12-14 13:31:59,031 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:31:59,032 INFO L225 Difference]: With dead ends: 73 [2022-12-14 13:31:59,032 INFO L226 Difference]: Without dead ends: 46 [2022-12-14 13:31:59,033 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 58 SyntacticMatches, 2 SemanticMatches, 136 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4806 ImplicationChecksByTransitivity, 22.1s TimeCoverageRelationStatistics Valid=725, Invalid=18181, Unknown=0, NotChecked=0, Total=18906 [2022-12-14 13:31:59,033 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 139 mSDsluCounter, 129 mSDsCounter, 0 mSdLazyCounter, 3133 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 139 SdHoareTripleChecker+Valid, 131 SdHoareTripleChecker+Invalid, 3141 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 3133 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2022-12-14 13:31:59,033 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [139 Valid, 131 Invalid, 3141 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 3133 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2022-12-14 13:31:59,034 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2022-12-14 13:31:59,067 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2022-12-14 13:31:59,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 45 states have (on average 1.0444444444444445) internal successors, (47), 45 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:31:59,068 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 47 transitions. [2022-12-14 13:31:59,068 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 47 transitions. Word has length 44 [2022-12-14 13:31:59,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:31:59,068 INFO L495 AbstractCegarLoop]: Abstraction has 46 states and 47 transitions. [2022-12-14 13:31:59,068 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 106 states, 106 states have (on average 1.0377358490566038) internal successors, (110), 106 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:31:59,068 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 47 transitions. [2022-12-14 13:31:59,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2022-12-14 13:31:59,068 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:31:59,068 INFO L195 NwaCegarLoop]: trace histogram [18, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:31:59,072 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Ended with exit code 0 [2022-12-14 13:31:59,269 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2022-12-14 13:31:59,270 INFO L420 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:31:59,270 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:31:59,271 INFO L85 PathProgramCache]: Analyzing trace with hash 187509045, now seen corresponding path program 33 times [2022-12-14 13:31:59,271 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:31:59,271 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1661316441] [2022-12-14 13:31:59,271 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:31:59,272 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:31:59,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:32:00,294 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 136 proven. 188 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:32:00,294 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:32:00,294 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1661316441] [2022-12-14 13:32:00,294 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1661316441] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:32:00,294 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [46017088] [2022-12-14 13:32:00,295 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 13:32:00,295 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:32:00,295 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:32:00,295 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:32:00,296 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2022-12-14 13:32:00,333 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 13:32:00,333 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:32:00,334 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 42 conjunts are in the unsatisfiable core [2022-12-14 13:32:00,335 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:32:01,350 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 153 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:32:01,350 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:32:02,584 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 171 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:32:02,584 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [46017088] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:32:02,585 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2111613901] [2022-12-14 13:32:02,586 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-12-14 13:32:02,586 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:32:02,586 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:32:02,586 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:32:02,586 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:32:02,680 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:32:03,671 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13481#(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 [2022-12-14 13:32:03,671 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:32:03,671 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:32:03,671 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 41, 41] total 99 [2022-12-14 13:32:03,672 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [713111254] [2022-12-14 13:32:03,672 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:32:03,672 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 99 states [2022-12-14 13:32:03,672 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:32:03,673 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 99 interpolants. [2022-12-14 13:32:03,674 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1875, Invalid=9681, Unknown=0, NotChecked=0, Total=11556 [2022-12-14 13:32:03,674 INFO L87 Difference]: Start difference. First operand 46 states and 47 transitions. Second operand has 99 states, 99 states have (on average 1.0808080808080809) internal successors, (107), 99 states have internal predecessors, (107), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:32:04,612 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:32:04,612 INFO L93 Difference]: Finished difference Result 51 states and 52 transitions. [2022-12-14 13:32:04,612 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2022-12-14 13:32:04,613 INFO L78 Accepts]: Start accepts. Automaton has has 99 states, 99 states have (on average 1.0808080808080809) internal successors, (107), 99 states have internal predecessors, (107), 0 states have call successors, (0), 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 45 [2022-12-14 13:32:04,613 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:32:04,613 INFO L225 Difference]: With dead ends: 51 [2022-12-14 13:32:04,613 INFO L226 Difference]: Without dead ends: 47 [2022-12-14 13:32:04,614 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 49 SyntacticMatches, 20 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8572 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=3627, Invalid=12629, Unknown=0, NotChecked=0, Total=16256 [2022-12-14 13:32:04,614 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 290 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 264 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 290 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 264 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 264 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 13:32:04,615 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [290 Valid, 12 Invalid, 264 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 264 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 13:32:04,615 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2022-12-14 13:32:04,652 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2022-12-14 13:32:04,653 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) [2022-12-14 13:32:04,653 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 48 transitions. [2022-12-14 13:32:04,653 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 48 transitions. Word has length 45 [2022-12-14 13:32:04,653 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:32:04,653 INFO L495 AbstractCegarLoop]: Abstraction has 47 states and 48 transitions. [2022-12-14 13:32:04,653 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 99 states, 99 states have (on average 1.0808080808080809) internal successors, (107), 99 states have internal predecessors, (107), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:32:04,653 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 48 transitions. [2022-12-14 13:32:04,653 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-12-14 13:32:04,653 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:32:04,654 INFO L195 NwaCegarLoop]: trace histogram [18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:32:04,658 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Ended with exit code 0 [2022-12-14 13:32:04,854 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2022-12-14 13:32:04,855 INFO L420 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:32:04,855 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:32:04,856 INFO L85 PathProgramCache]: Analyzing trace with hash 1510711311, now seen corresponding path program 34 times [2022-12-14 13:32:04,856 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:32:04,856 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [974897479] [2022-12-14 13:32:04,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:32:04,857 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:32:04,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:32:07,008 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:32:07,008 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:32:07,008 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [974897479] [2022-12-14 13:32:07,008 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [974897479] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:32:07,008 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1682219175] [2022-12-14 13:32:07,008 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 13:32:07,009 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:32:07,009 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:32:07,009 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:32:07,010 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2022-12-14 13:32:07,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:32:07,049 WARN L261 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 106 conjunts are in the unsatisfiable core [2022-12-14 13:32:07,050 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:32:13,230 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:32:13,230 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:32:17,242 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:32:17,242 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1682219175] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:32:17,242 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1432834752] [2022-12-14 13:32:17,243 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-12-14 13:32:17,243 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:32:17,244 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:32:17,244 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:32:17,244 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:32:17,343 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:32:19,254 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '14110#(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 [2022-12-14 13:32:19,254 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:32:19,255 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:32:19,255 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 45] total 131 [2022-12-14 13:32:19,255 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [57804410] [2022-12-14 13:32:19,255 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:32:19,255 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 131 states [2022-12-14 13:32:19,255 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:32:19,255 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 131 interpolants. [2022-12-14 13:32:19,256 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=577, Invalid=18883, Unknown=0, NotChecked=0, Total=19460 [2022-12-14 13:32:19,256 INFO L87 Difference]: Start difference. First operand 47 states and 48 transitions. Second operand has 131 states, 131 states have (on average 1.0305343511450382) internal successors, (135), 131 states have internal predecessors, (135), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:32:28,547 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:32:28,547 INFO L93 Difference]: Finished difference Result 76 states and 79 transitions. [2022-12-14 13:32:28,548 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2022-12-14 13:32:28,548 INFO L78 Accepts]: Start accepts. Automaton has has 131 states, 131 states have (on average 1.0305343511450382) internal successors, (135), 131 states have internal predecessors, (135), 0 states have call successors, (0), 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 [2022-12-14 13:32:28,548 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:32:28,548 INFO L225 Difference]: With dead ends: 76 [2022-12-14 13:32:28,548 INFO L226 Difference]: Without dead ends: 48 [2022-12-14 13:32:28,550 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 206 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 163 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9185 ImplicationChecksByTransitivity, 18.8s TimeCoverageRelationStatistics Valid=975, Invalid=26085, Unknown=0, NotChecked=0, Total=27060 [2022-12-14 13:32:28,550 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 132 mSDsluCounter, 148 mSDsCounter, 0 mSdLazyCounter, 3573 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 132 SdHoareTripleChecker+Valid, 150 SdHoareTripleChecker+Invalid, 3581 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 3573 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2022-12-14 13:32:28,550 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [132 Valid, 150 Invalid, 3581 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 3573 Invalid, 0 Unknown, 0 Unchecked, 2.0s Time] [2022-12-14 13:32:28,550 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2022-12-14 13:32:28,596 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2022-12-14 13:32:28,596 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 47 states have (on average 1.0425531914893618) internal successors, (49), 47 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) [2022-12-14 13:32:28,596 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 49 transitions. [2022-12-14 13:32:28,596 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 49 transitions. Word has length 46 [2022-12-14 13:32:28,596 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:32:28,596 INFO L495 AbstractCegarLoop]: Abstraction has 48 states and 49 transitions. [2022-12-14 13:32:28,596 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 131 states, 131 states have (on average 1.0305343511450382) internal successors, (135), 131 states have internal predecessors, (135), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:32:28,597 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 49 transitions. [2022-12-14 13:32:28,597 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-12-14 13:32:28,597 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:32:28,597 INFO L195 NwaCegarLoop]: trace histogram [19, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:32:28,601 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Ended with exit code 0 [2022-12-14 13:32:28,797 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39,37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:32:28,798 INFO L420 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:32:28,798 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:32:28,799 INFO L85 PathProgramCache]: Analyzing trace with hash 1097174894, now seen corresponding path program 35 times [2022-12-14 13:32:28,799 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:32:28,800 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [67182250] [2022-12-14 13:32:28,800 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:32:28,801 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:32:28,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:32:30,282 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 153 proven. 208 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:32:30,282 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:32:30,282 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [67182250] [2022-12-14 13:32:30,282 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [67182250] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:32:30,282 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2039919743] [2022-12-14 13:32:30,283 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 13:32:30,283 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:32:30,283 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:32:30,283 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:32:30,284 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2022-12-14 13:32:30,339 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2022-12-14 13:32:30,339 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:32:30,341 INFO L263 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 44 conjunts are in the unsatisfiable core [2022-12-14 13:32:30,342 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:32:31,862 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 171 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:32:31,862 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:32:33,216 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 190 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:32:33,216 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2039919743] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:32:33,216 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [988926075] [2022-12-14 13:32:33,217 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-12-14 13:32:33,217 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:32:33,217 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:32:33,217 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:32:33,217 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:32:33,311 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:32:34,359 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '14778#(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 [2022-12-14 13:32:34,360 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:32:34,360 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:32:34,360 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 43, 43] total 104 [2022-12-14 13:32:34,360 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [450303320] [2022-12-14 13:32:34,360 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:32:34,360 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 104 states [2022-12-14 13:32:34,360 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:32:34,361 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 104 interpolants. [2022-12-14 13:32:34,361 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2062, Invalid=10594, Unknown=0, NotChecked=0, Total=12656 [2022-12-14 13:32:34,362 INFO L87 Difference]: Start difference. First operand 48 states and 49 transitions. Second operand has 104 states, 104 states have (on average 1.0769230769230769) internal successors, (112), 104 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:32:35,431 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:32:35,431 INFO L93 Difference]: Finished difference Result 53 states and 54 transitions. [2022-12-14 13:32:35,431 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2022-12-14 13:32:35,431 INFO L78 Accepts]: Start accepts. Automaton has has 104 states, 104 states have (on average 1.0769230769230769) internal successors, (112), 104 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 47 [2022-12-14 13:32:35,431 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:32:35,431 INFO L225 Difference]: With dead ends: 53 [2022-12-14 13:32:35,431 INFO L226 Difference]: Without dead ends: 49 [2022-12-14 13:32:35,432 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 204 GetRequests, 51 SyntacticMatches, 21 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9434 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=3996, Invalid=13826, Unknown=0, NotChecked=0, Total=17822 [2022-12-14 13:32:35,432 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 114 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 272 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 114 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 272 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 272 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 13:32:35,433 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [114 Valid, 12 Invalid, 272 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 272 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 13:32:35,433 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2022-12-14 13:32:35,469 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2022-12-14 13:32:35,469 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 48 states have (on average 1.0416666666666667) internal successors, (50), 48 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) [2022-12-14 13:32:35,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 50 transitions. [2022-12-14 13:32:35,470 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 50 transitions. Word has length 47 [2022-12-14 13:32:35,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:32:35,470 INFO L495 AbstractCegarLoop]: Abstraction has 49 states and 50 transitions. [2022-12-14 13:32:35,470 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 104 states, 104 states have (on average 1.0769230769230769) internal successors, (112), 104 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:32:35,470 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 50 transitions. [2022-12-14 13:32:35,470 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-12-14 13:32:35,470 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:32:35,471 INFO L195 NwaCegarLoop]: trace histogram [19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:32:35,475 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Ended with exit code 0 [2022-12-14 13:32:35,671 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable40 [2022-12-14 13:32:35,672 INFO L420 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:32:35,672 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:32:35,673 INFO L85 PathProgramCache]: Analyzing trace with hash -354418442, now seen corresponding path program 36 times [2022-12-14 13:32:35,673 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:32:35,673 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1385667289] [2022-12-14 13:32:35,674 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:32:35,674 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:32:35,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:32:38,012 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:32:38,012 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:32:38,012 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1385667289] [2022-12-14 13:32:38,013 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1385667289] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:32:38,013 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1182171391] [2022-12-14 13:32:38,013 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 13:32:38,013 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:32:38,013 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:32:38,014 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:32:38,015 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2022-12-14 13:32:38,056 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 13:32:38,056 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:32:38,058 WARN L261 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 112 conjunts are in the unsatisfiable core [2022-12-14 13:32:38,059 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:32:45,294 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:32:45,294 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:32:50,920 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:32:50,920 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1182171391] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:32:50,920 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1381595311] [2022-12-14 13:32:50,921 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-12-14 13:32:50,921 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:32:50,921 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:32:50,921 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:32:50,921 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:32:51,011 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:32:52,905 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15414#(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 [2022-12-14 13:32:52,906 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:32:52,906 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:32:52,906 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 116 [2022-12-14 13:32:52,906 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1643495975] [2022-12-14 13:32:52,906 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:32:52,906 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 116 states [2022-12-14 13:32:52,906 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:32:52,907 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 116 interpolants. [2022-12-14 13:32:52,908 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=412, Invalid=15088, Unknown=0, NotChecked=0, Total=15500 [2022-12-14 13:32:52,908 INFO L87 Difference]: Start difference. First operand 49 states and 50 transitions. Second operand has 116 states, 116 states have (on average 1.0344827586206897) internal successors, (120), 116 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:33:04,940 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:33:04,941 INFO L93 Difference]: Finished difference Result 79 states and 82 transitions. [2022-12-14 13:33:04,941 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2022-12-14 13:33:04,941 INFO L78 Accepts]: Start accepts. Automaton has has 116 states, 116 states have (on average 1.0344827586206897) internal successors, (120), 116 states have internal predecessors, (120), 0 states have call successors, (0), 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 [2022-12-14 13:33:04,941 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:33:04,941 INFO L225 Difference]: With dead ends: 79 [2022-12-14 13:33:04,941 INFO L226 Difference]: Without dead ends: 50 [2022-12-14 13:33:04,942 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 214 GetRequests, 64 SyntacticMatches, 2 SemanticMatches, 148 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5705 ImplicationChecksByTransitivity, 23.6s TimeCoverageRelationStatistics Valid=791, Invalid=21559, Unknown=0, NotChecked=0, Total=22350 [2022-12-14 13:33:04,942 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 158 mSDsluCounter, 166 mSDsCounter, 0 mSdLazyCounter, 3968 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 158 SdHoareTripleChecker+Valid, 168 SdHoareTripleChecker+Invalid, 3976 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 3968 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2022-12-14 13:33:04,943 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [158 Valid, 168 Invalid, 3976 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 3968 Invalid, 0 Unknown, 0 Unchecked, 2.4s Time] [2022-12-14 13:33:04,943 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2022-12-14 13:33:04,981 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2022-12-14 13:33:04,981 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 49 states have (on average 1.0408163265306123) internal successors, (51), 49 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) [2022-12-14 13:33:04,981 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 51 transitions. [2022-12-14 13:33:04,981 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 51 transitions. Word has length 48 [2022-12-14 13:33:04,982 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:33:04,982 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 51 transitions. [2022-12-14 13:33:04,982 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 116 states, 116 states have (on average 1.0344827586206897) internal successors, (120), 116 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:33:04,982 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 51 transitions. [2022-12-14 13:33:04,982 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-12-14 13:33:04,982 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:33:04,982 INFO L195 NwaCegarLoop]: trace histogram [20, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:33:04,986 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Ended with exit code 0 [2022-12-14 13:33:05,183 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable41 [2022-12-14 13:33:05,184 INFO L420 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:33:05,184 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:33:05,185 INFO L85 PathProgramCache]: Analyzing trace with hash 1669043349, now seen corresponding path program 37 times [2022-12-14 13:33:05,185 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:33:05,185 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [98665491] [2022-12-14 13:33:05,185 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:33:05,186 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:33:05,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:33:06,410 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 171 proven. 229 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:33:06,410 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:33:06,410 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [98665491] [2022-12-14 13:33:06,410 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [98665491] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:33:06,410 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1838887115] [2022-12-14 13:33:06,410 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 13:33:06,410 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:33:06,410 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:33:06,411 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:33:06,412 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2022-12-14 13:33:06,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:33:06,447 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 46 conjunts are in the unsatisfiable core [2022-12-14 13:33:06,448 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:33:07,660 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 190 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:33:07,661 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:33:08,831 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 210 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:33:08,831 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1838887115] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:33:08,831 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1898885368] [2022-12-14 13:33:08,832 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-12-14 13:33:08,832 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:33:08,832 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:33:08,832 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:33:08,832 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:33:08,923 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:33:09,797 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16109#(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 [2022-12-14 13:33:09,798 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:33:09,798 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:33:09,798 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 45, 45] total 109 [2022-12-14 13:33:09,798 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1025162618] [2022-12-14 13:33:09,798 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:33:09,798 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 109 states [2022-12-14 13:33:09,798 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:33:09,799 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 109 interpolants. [2022-12-14 13:33:09,799 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2258, Invalid=11548, Unknown=0, NotChecked=0, Total=13806 [2022-12-14 13:33:09,799 INFO L87 Difference]: Start difference. First operand 50 states and 51 transitions. Second operand has 109 states, 109 states have (on average 1.073394495412844) internal successors, (117), 109 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:33:10,804 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:33:10,804 INFO L93 Difference]: Finished difference Result 55 states and 56 transitions. [2022-12-14 13:33:10,804 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2022-12-14 13:33:10,804 INFO L78 Accepts]: Start accepts. Automaton has has 109 states, 109 states have (on average 1.073394495412844) internal successors, (117), 109 states have internal predecessors, (117), 0 states have call successors, (0), 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 49 [2022-12-14 13:33:10,804 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:33:10,805 INFO L225 Difference]: With dead ends: 55 [2022-12-14 13:33:10,805 INFO L226 Difference]: Without dead ends: 51 [2022-12-14 13:33:10,805 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 213 GetRequests, 53 SyntacticMatches, 22 SemanticMatches, 138 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10337 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=4383, Invalid=15077, Unknown=0, NotChecked=0, Total=19460 [2022-12-14 13:33:10,806 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 201 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 368 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 201 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 368 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 368 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 13:33:10,806 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [201 Valid, 21 Invalid, 368 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 368 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 13:33:10,806 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2022-12-14 13:33:10,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2022-12-14 13:33:10,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 50 states have (on average 1.04) internal successors, (52), 50 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) [2022-12-14 13:33:10,846 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2022-12-14 13:33:10,846 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 49 [2022-12-14 13:33:10,846 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:33:10,847 INFO L495 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2022-12-14 13:33:10,847 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 109 states, 109 states have (on average 1.073394495412844) internal successors, (117), 109 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:33:10,847 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2022-12-14 13:33:10,847 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-12-14 13:33:10,847 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:33:10,847 INFO L195 NwaCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:33:10,851 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Ended with exit code 0 [2022-12-14 13:33:11,047 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42,40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:33:11,048 INFO L420 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:33:11,049 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:33:11,049 INFO L85 PathProgramCache]: Analyzing trace with hash 193634479, now seen corresponding path program 38 times [2022-12-14 13:33:11,049 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:33:11,049 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1212475770] [2022-12-14 13:33:11,050 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:33:11,050 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:33:11,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:33:13,452 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:33:13,453 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:33:13,453 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1212475770] [2022-12-14 13:33:13,453 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1212475770] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:33:13,453 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [350951750] [2022-12-14 13:33:13,453 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 13:33:13,453 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:33:13,453 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:33:13,454 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:33:13,455 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2022-12-14 13:33:13,508 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2022-12-14 13:33:13,508 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:33:13,510 WARN L261 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 117 conjunts are in the unsatisfiable core [2022-12-14 13:33:13,511 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:33:20,839 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:33:20,840 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:33:27,861 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:33:27,862 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [350951750] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:33:27,862 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1490414321] [2022-12-14 13:33:27,862 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-12-14 13:33:27,862 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:33:27,862 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:33:27,863 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:33:27,863 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:33:27,962 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:33:30,309 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16772#(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 [2022-12-14 13:33:30,310 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:33:30,310 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:33:30,310 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 121 [2022-12-14 13:33:30,310 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1028078470] [2022-12-14 13:33:30,310 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:33:30,310 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 121 states [2022-12-14 13:33:30,310 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:33:30,311 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 121 interpolants. [2022-12-14 13:33:30,311 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=454, Invalid=16316, Unknown=0, NotChecked=0, Total=16770 [2022-12-14 13:33:30,312 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand has 121 states, 121 states have (on average 1.0330578512396693) internal successors, (125), 121 states have internal predecessors, (125), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:33:54,946 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:33:54,947 INFO L93 Difference]: Finished difference Result 85 states and 89 transitions. [2022-12-14 13:33:54,947 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2022-12-14 13:33:54,947 INFO L78 Accepts]: Start accepts. Automaton has has 121 states, 121 states have (on average 1.0330578512396693) internal successors, (125), 121 states have internal predecessors, (125), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 50 [2022-12-14 13:33:54,947 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:33:54,948 INFO L225 Difference]: With dead ends: 85 [2022-12-14 13:33:54,948 INFO L226 Difference]: Without dead ends: 53 [2022-12-14 13:33:54,949 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 248 GetRequests, 67 SyntacticMatches, 2 SemanticMatches, 179 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8254 ImplicationChecksByTransitivity, 37.3s TimeCoverageRelationStatistics Valid=1632, Invalid=30948, Unknown=0, NotChecked=0, Total=32580 [2022-12-14 13:33:54,949 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 922 mSDsluCounter, 83 mSDsCounter, 0 mSdLazyCounter, 4259 mSolverCounterSat, 59 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 922 SdHoareTripleChecker+Valid, 85 SdHoareTripleChecker+Invalid, 4318 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 59 IncrementalHoareTripleChecker+Valid, 4259 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.8s IncrementalHoareTripleChecker+Time [2022-12-14 13:33:54,950 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [922 Valid, 85 Invalid, 4318 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [59 Valid, 4259 Invalid, 0 Unknown, 0 Unchecked, 2.8s Time] [2022-12-14 13:33:54,950 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2022-12-14 13:33:54,994 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2022-12-14 13:33:54,994 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 52 states have (on average 1.0384615384615385) internal successors, (54), 52 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) [2022-12-14 13:33:54,995 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 54 transitions. [2022-12-14 13:33:54,995 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 54 transitions. Word has length 50 [2022-12-14 13:33:54,995 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:33:54,995 INFO L495 AbstractCegarLoop]: Abstraction has 53 states and 54 transitions. [2022-12-14 13:33:54,995 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 121 states, 121 states have (on average 1.0330578512396693) internal successors, (125), 121 states have internal predecessors, (125), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:33:54,995 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 54 transitions. [2022-12-14 13:33:54,995 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2022-12-14 13:33:54,995 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:33:54,995 INFO L195 NwaCegarLoop]: trace histogram [21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:33:54,999 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Ended with exit code 0 [2022-12-14 13:33:55,196 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43,41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:33:55,196 INFO L420 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:33:55,197 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:33:55,197 INFO L85 PathProgramCache]: Analyzing trace with hash -1510151210, now seen corresponding path program 39 times [2022-12-14 13:33:55,197 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:33:55,198 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [59814387] [2022-12-14 13:33:55,198 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:33:55,198 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:33:55,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:33:58,216 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 462 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:33:58,216 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:33:58,216 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [59814387] [2022-12-14 13:33:58,216 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [59814387] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:33:58,216 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [322416829] [2022-12-14 13:33:58,216 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 13:33:58,216 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:33:58,217 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:33:58,217 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:33:58,218 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2022-12-14 13:33:58,256 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 13:33:58,256 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:33:58,259 WARN L261 TraceCheckSpWp]: Trace formula consists of 202 conjuncts, 120 conjunts are in the unsatisfiable core [2022-12-14 13:33:58,260 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:34:06,762 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 462 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:34:06,762 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:34:13,760 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 462 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:34:13,760 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [322416829] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:34:13,760 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [634096352] [2022-12-14 13:34:13,761 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-12-14 13:34:13,761 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:34:13,761 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:34:13,761 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:34:13,761 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:34:13,852 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:34:15,696 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '17571#(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 [2022-12-14 13:34:15,696 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:34:15,697 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:34:15,697 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 126 [2022-12-14 13:34:15,697 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [945910610] [2022-12-14 13:34:15,697 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:34:15,697 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 126 states [2022-12-14 13:34:15,697 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:34:15,697 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 126 interpolants. [2022-12-14 13:34:15,698 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=446, Invalid=17644, Unknown=0, NotChecked=0, Total=18090 [2022-12-14 13:34:15,698 INFO L87 Difference]: Start difference. First operand 53 states and 54 transitions. Second operand has 126 states, 126 states have (on average 1.0317460317460319) internal successors, (130), 126 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:34:31,567 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:34:31,567 INFO L93 Difference]: Finished difference Result 85 states and 88 transitions. [2022-12-14 13:34:31,567 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2022-12-14 13:34:31,567 INFO L78 Accepts]: Start accepts. Automaton has has 126 states, 126 states have (on average 1.0317460317460319) internal successors, (130), 126 states have internal predecessors, (130), 0 states have call successors, (0), 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 52 [2022-12-14 13:34:31,567 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:34:31,568 INFO L225 Difference]: With dead ends: 85 [2022-12-14 13:34:31,568 INFO L226 Difference]: Without dead ends: 54 [2022-12-14 13:34:31,569 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 232 GetRequests, 70 SyntacticMatches, 2 SemanticMatches, 160 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6680 ImplicationChecksByTransitivity, 29.2s TimeCoverageRelationStatistics Valid=857, Invalid=25225, Unknown=0, NotChecked=0, Total=26082 [2022-12-14 13:34:31,569 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 142 mSDsluCounter, 190 mSDsCounter, 0 mSdLazyCounter, 4911 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 142 SdHoareTripleChecker+Valid, 192 SdHoareTripleChecker+Invalid, 4919 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 4911 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.1s IncrementalHoareTripleChecker+Time [2022-12-14 13:34:31,569 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [142 Valid, 192 Invalid, 4919 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 4911 Invalid, 0 Unknown, 0 Unchecked, 3.1s Time] [2022-12-14 13:34:31,570 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2022-12-14 13:34:31,616 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2022-12-14 13:34:31,616 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 53 states have (on average 1.0377358490566038) internal successors, (55), 53 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) [2022-12-14 13:34:31,616 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 55 transitions. [2022-12-14 13:34:31,616 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 55 transitions. Word has length 52 [2022-12-14 13:34:31,617 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:34:31,617 INFO L495 AbstractCegarLoop]: Abstraction has 54 states and 55 transitions. [2022-12-14 13:34:31,617 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 126 states, 126 states have (on average 1.0317460317460319) internal successors, (130), 126 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:34:31,617 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 55 transitions. [2022-12-14 13:34:31,617 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2022-12-14 13:34:31,617 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:34:31,617 INFO L195 NwaCegarLoop]: trace histogram [22, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:34:31,621 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Forceful destruction successful, exit code 0 [2022-12-14 13:34:31,818 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44,42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:34:31,818 INFO L420 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:34:31,819 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:34:31,819 INFO L85 PathProgramCache]: Analyzing trace with hash 2035783669, now seen corresponding path program 40 times [2022-12-14 13:34:31,819 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:34:31,819 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1555305781] [2022-12-14 13:34:31,820 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:34:31,820 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:34:31,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:34:33,373 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 210 proven. 274 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:34:33,373 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:34:33,373 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1555305781] [2022-12-14 13:34:33,374 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1555305781] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:34:33,374 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1010776414] [2022-12-14 13:34:33,374 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 13:34:33,374 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:34:33,374 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:34:33,375 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:34:33,375 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2022-12-14 13:34:33,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:34:33,427 INFO L263 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 50 conjunts are in the unsatisfiable core [2022-12-14 13:34:33,428 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:34:35,074 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 231 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:34:35,074 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:34:36,690 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 253 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:34:36,690 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1010776414] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:34:36,690 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [122795413] [2022-12-14 13:34:36,691 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-12-14 13:34:36,691 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:34:36,691 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:34:36,691 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:34:36,691 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:34:36,782 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:34:37,891 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '18324#(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 [2022-12-14 13:34:37,891 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:34:37,891 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:34:37,891 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 49, 49] total 119 [2022-12-14 13:34:37,891 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1036178777] [2022-12-14 13:34:37,892 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:34:37,892 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 119 states [2022-12-14 13:34:37,892 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:34:37,892 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 119 interpolants. [2022-12-14 13:34:37,893 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2677, Invalid=13579, Unknown=0, NotChecked=0, Total=16256 [2022-12-14 13:34:37,893 INFO L87 Difference]: Start difference. First operand 54 states and 55 transitions. Second operand has 119 states, 119 states have (on average 1.0672268907563025) internal successors, (127), 119 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) [2022-12-14 13:34:39,315 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:34:39,315 INFO L93 Difference]: Finished difference Result 59 states and 60 transitions. [2022-12-14 13:34:39,315 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2022-12-14 13:34:39,315 INFO L78 Accepts]: Start accepts. Automaton has has 119 states, 119 states have (on average 1.0672268907563025) internal successors, (127), 119 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 53 [2022-12-14 13:34:39,315 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:34:39,325 INFO L225 Difference]: With dead ends: 59 [2022-12-14 13:34:39,325 INFO L226 Difference]: Without dead ends: 55 [2022-12-14 13:34:39,326 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 57 SyntacticMatches, 24 SemanticMatches, 150 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12266 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=5211, Invalid=17741, Unknown=0, NotChecked=0, Total=22952 [2022-12-14 13:34:39,326 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 214 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 434 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 214 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 434 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 434 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 13:34:39,326 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [214 Valid, 24 Invalid, 434 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 434 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 13:34:39,326 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2022-12-14 13:34:39,374 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2022-12-14 13:34:39,375 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 54 states have (on average 1.037037037037037) internal successors, (56), 54 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:34:39,375 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 56 transitions. [2022-12-14 13:34:39,375 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 56 transitions. Word has length 53 [2022-12-14 13:34:39,375 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:34:39,375 INFO L495 AbstractCegarLoop]: Abstraction has 55 states and 56 transitions. [2022-12-14 13:34:39,375 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 119 states, 119 states have (on average 1.0672268907563025) internal successors, (127), 119 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) [2022-12-14 13:34:39,375 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 56 transitions. [2022-12-14 13:34:39,375 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2022-12-14 13:34:39,375 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:34:39,375 INFO L195 NwaCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:34:39,379 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Ended with exit code 0 [2022-12-14 13:34:39,576 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable45 [2022-12-14 13:34:39,577 INFO L420 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:34:39,577 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:34:39,577 INFO L85 PathProgramCache]: Analyzing trace with hash -1322317489, now seen corresponding path program 41 times [2022-12-14 13:34:39,578 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:34:39,578 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [21922010] [2022-12-14 13:34:39,578 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:34:39,578 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:34:39,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:34:42,441 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:34:42,441 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:34:42,441 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [21922010] [2022-12-14 13:34:42,441 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [21922010] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:34:42,441 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1446310887] [2022-12-14 13:34:42,441 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 13:34:42,441 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:34:42,441 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:34:42,442 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:34:42,443 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2022-12-14 13:34:42,504 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2022-12-14 13:34:42,504 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:34:42,507 WARN L261 TraceCheckSpWp]: Trace formula consists of 208 conjuncts, 125 conjunts are in the unsatisfiable core [2022-12-14 13:34:42,508 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:34:51,259 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:34:51,259 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:34:59,071 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:34:59,071 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1446310887] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:34:59,071 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1329065312] [2022-12-14 13:34:59,072 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-12-14 13:34:59,072 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:34:59,072 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:34:59,072 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:34:59,072 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:34:59,172 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:35:01,336 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '19041#(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 [2022-12-14 13:35:01,337 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:35:01,337 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:35:01,337 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 131 [2022-12-14 13:35:01,337 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1294880302] [2022-12-14 13:35:01,337 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:35:01,337 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 131 states [2022-12-14 13:35:01,337 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:35:01,338 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 131 interpolants. [2022-12-14 13:35:01,339 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=490, Invalid=18970, Unknown=0, NotChecked=0, Total=19460 [2022-12-14 13:35:01,339 INFO L87 Difference]: Start difference. First operand 55 states and 56 transitions. Second operand has 131 states, 131 states have (on average 1.0305343511450382) internal successors, (135), 131 states have internal predecessors, (135), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:35:30,493 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:35:30,493 INFO L93 Difference]: Finished difference Result 91 states and 95 transitions. [2022-12-14 13:35:30,493 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2022-12-14 13:35:30,493 INFO L78 Accepts]: Start accepts. Automaton has has 131 states, 131 states have (on average 1.0305343511450382) internal successors, (135), 131 states have internal predecessors, (135), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 54 [2022-12-14 13:35:30,493 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:35:30,493 INFO L225 Difference]: With dead ends: 91 [2022-12-14 13:35:30,493 INFO L226 Difference]: Without dead ends: 57 [2022-12-14 13:35:30,495 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 268 GetRequests, 73 SyntacticMatches, 2 SemanticMatches, 193 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9622 ImplicationChecksByTransitivity, 42.8s TimeCoverageRelationStatistics Valid=1816, Invalid=36014, Unknown=0, NotChecked=0, Total=37830 [2022-12-14 13:35:30,495 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 1049 mSDsluCounter, 113 mSDsCounter, 0 mSdLazyCounter, 5800 mSolverCounterSat, 61 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1049 SdHoareTripleChecker+Valid, 115 SdHoareTripleChecker+Invalid, 5861 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 61 IncrementalHoareTripleChecker+Valid, 5800 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.0s IncrementalHoareTripleChecker+Time [2022-12-14 13:35:30,496 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1049 Valid, 115 Invalid, 5861 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [61 Valid, 5800 Invalid, 0 Unknown, 0 Unchecked, 4.0s Time] [2022-12-14 13:35:30,496 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2022-12-14 13:35:30,549 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2022-12-14 13:35:30,549 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 56 states have (on average 1.0357142857142858) internal successors, (58), 56 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:35:30,549 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 58 transitions. [2022-12-14 13:35:30,550 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 58 transitions. Word has length 54 [2022-12-14 13:35:30,550 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:35:30,550 INFO L495 AbstractCegarLoop]: Abstraction has 57 states and 58 transitions. [2022-12-14 13:35:30,550 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 131 states, 131 states have (on average 1.0305343511450382) internal successors, (135), 131 states have internal predecessors, (135), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:35:30,550 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 58 transitions. [2022-12-14 13:35:30,550 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2022-12-14 13:35:30,550 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:35:30,550 INFO L195 NwaCegarLoop]: trace histogram [23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:35:30,554 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Ended with exit code 0 [2022-12-14 13:35:30,751 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable46 [2022-12-14 13:35:30,751 INFO L420 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:35:30,752 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:35:30,752 INFO L85 PathProgramCache]: Analyzing trace with hash -118903114, now seen corresponding path program 42 times [2022-12-14 13:35:30,752 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:35:30,753 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1337360129] [2022-12-14 13:35:30,753 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:35:30,753 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:35:30,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:35:33,615 INFO L134 CoverageAnalysis]: Checked inductivity of 552 backedges. 0 proven. 552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:35:33,616 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:35:33,616 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1337360129] [2022-12-14 13:35:33,616 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1337360129] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:35:33,616 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [881805637] [2022-12-14 13:35:33,616 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 13:35:33,616 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:35:33,616 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:35:33,617 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:35:33,618 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2022-12-14 13:35:33,664 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 13:35:33,665 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:35:33,667 WARN L261 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 128 conjunts are in the unsatisfiable core [2022-12-14 13:35:33,669 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:35:42,413 INFO L134 CoverageAnalysis]: Checked inductivity of 552 backedges. 0 proven. 552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:35:42,413 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:35:49,867 INFO L134 CoverageAnalysis]: Checked inductivity of 552 backedges. 0 proven. 552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:35:49,868 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [881805637] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:35:49,868 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [506898641] [2022-12-14 13:35:49,868 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-12-14 13:35:49,869 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:35:49,869 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:35:49,869 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:35:49,869 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:35:49,962 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:35:52,447 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '19902#(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 [2022-12-14 13:35:52,447 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:35:52,447 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:35:52,447 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 55, 55] total 136 [2022-12-14 13:35:52,447 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1173788216] [2022-12-14 13:35:52,447 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:35:52,448 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 136 states [2022-12-14 13:35:52,448 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:35:52,448 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 136 interpolants. [2022-12-14 13:35:52,449 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=480, Invalid=20400, Unknown=0, NotChecked=0, Total=20880 [2022-12-14 13:35:52,449 INFO L87 Difference]: Start difference. First operand 57 states and 58 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) [2022-12-14 13:36:09,422 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:36:09,423 INFO L93 Difference]: Finished difference Result 91 states and 94 transitions. [2022-12-14 13:36:09,423 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2022-12-14 13:36:09,423 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 56 [2022-12-14 13:36:09,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:36:09,423 INFO L225 Difference]: With dead ends: 91 [2022-12-14 13:36:09,424 INFO L226 Difference]: Without dead ends: 58 [2022-12-14 13:36:09,425 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 250 GetRequests, 76 SyntacticMatches, 2 SemanticMatches, 172 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7731 ImplicationChecksByTransitivity, 31.1s TimeCoverageRelationStatistics Valid=923, Invalid=29179, Unknown=0, NotChecked=0, Total=30102 [2022-12-14 13:36:09,426 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 175 mSDsluCounter, 190 mSDsCounter, 0 mSdLazyCounter, 5607 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 175 SdHoareTripleChecker+Valid, 192 SdHoareTripleChecker+Invalid, 5615 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 5607 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.6s IncrementalHoareTripleChecker+Time [2022-12-14 13:36:09,426 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [175 Valid, 192 Invalid, 5615 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 5607 Invalid, 0 Unknown, 0 Unchecked, 3.6s Time] [2022-12-14 13:36:09,426 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2022-12-14 13:36:09,481 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2022-12-14 13:36:09,482 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 57 states have (on average 1.0350877192982457) internal successors, (59), 57 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:36:09,482 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 59 transitions. [2022-12-14 13:36:09,482 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 59 transitions. Word has length 56 [2022-12-14 13:36:09,482 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:36:09,482 INFO L495 AbstractCegarLoop]: Abstraction has 58 states and 59 transitions. [2022-12-14 13:36:09,482 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) [2022-12-14 13:36:09,482 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 59 transitions. [2022-12-14 13:36:09,482 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2022-12-14 13:36:09,482 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:36:09,483 INFO L195 NwaCegarLoop]: trace histogram [24, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:36:09,487 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Ended with exit code 0 [2022-12-14 13:36:09,683 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47,45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:36:09,684 INFO L420 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:36:09,684 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:36:09,685 INFO L85 PathProgramCache]: Analyzing trace with hash 147010389, now seen corresponding path program 43 times [2022-12-14 13:36:09,685 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:36:09,685 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [755134617] [2022-12-14 13:36:09,686 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:36:09,686 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:36:09,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:36:11,647 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 253 proven. 323 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:36:11,647 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:36:11,648 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [755134617] [2022-12-14 13:36:11,648 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [755134617] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:36:11,648 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [740031060] [2022-12-14 13:36:11,648 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 13:36:11,648 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:36:11,648 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:36:11,649 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:36:11,649 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2022-12-14 13:36:11,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:36:11,691 INFO L263 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 54 conjunts are in the unsatisfiable core [2022-12-14 13:36:11,692 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:36:13,458 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 276 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:36:13,458 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:36:15,061 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 300 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:36:15,061 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [740031060] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:36:15,061 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1817543310] [2022-12-14 13:36:15,062 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-12-14 13:36:15,062 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:36:15,062 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:36:15,062 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:36:15,062 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:36:15,175 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:36:16,148 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '20713#(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 [2022-12-14 13:36:16,149 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:36:16,149 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:36:16,149 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 53, 53] total 129 [2022-12-14 13:36:16,149 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [979174477] [2022-12-14 13:36:16,149 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:36:16,149 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 129 states [2022-12-14 13:36:16,149 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:36:16,150 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 129 interpolants. [2022-12-14 13:36:16,151 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3132, Invalid=15774, Unknown=0, NotChecked=0, Total=18906 [2022-12-14 13:36:16,151 INFO L87 Difference]: Start difference. First operand 58 states and 59 transitions. Second operand has 129 states, 129 states have (on average 1.062015503875969) internal successors, (137), 129 states have internal predecessors, (137), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:36:17,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:36:17,632 INFO L93 Difference]: Finished difference Result 63 states and 64 transitions. [2022-12-14 13:36:17,632 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2022-12-14 13:36:17,632 INFO L78 Accepts]: Start accepts. Automaton has has 129 states, 129 states have (on average 1.062015503875969) internal successors, (137), 129 states have internal predecessors, (137), 0 states have call successors, (0), 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 57 [2022-12-14 13:36:17,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:36:17,633 INFO L225 Difference]: With dead ends: 63 [2022-12-14 13:36:17,633 INFO L226 Difference]: Without dead ends: 59 [2022-12-14 13:36:17,634 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 249 GetRequests, 61 SyntacticMatches, 26 SemanticMatches, 162 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14359 ImplicationChecksByTransitivity, 6.6s TimeCoverageRelationStatistics Valid=6111, Invalid=20621, Unknown=0, NotChecked=0, Total=26732 [2022-12-14 13:36:17,634 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 198 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 564 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 198 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 564 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 564 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 13:36:17,634 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [198 Valid, 33 Invalid, 564 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 564 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 13:36:17,634 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2022-12-14 13:36:17,693 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2022-12-14 13:36:17,693 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 58 states have (on average 1.0344827586206897) internal successors, (60), 58 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:36:17,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 60 transitions. [2022-12-14 13:36:17,694 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 60 transitions. Word has length 57 [2022-12-14 13:36:17,694 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:36:17,694 INFO L495 AbstractCegarLoop]: Abstraction has 59 states and 60 transitions. [2022-12-14 13:36:17,694 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 129 states, 129 states have (on average 1.062015503875969) internal successors, (137), 129 states have internal predecessors, (137), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:36:17,694 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 60 transitions. [2022-12-14 13:36:17,694 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-12-14 13:36:17,694 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:36:17,694 INFO L195 NwaCegarLoop]: trace histogram [24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:36:17,698 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Ended with exit code 0 [2022-12-14 13:36:17,895 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable48 [2022-12-14 13:36:17,896 INFO L420 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:36:17,896 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:36:17,897 INFO L85 PathProgramCache]: Analyzing trace with hash 255252975, now seen corresponding path program 44 times [2022-12-14 13:36:17,897 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:36:17,897 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1674857216] [2022-12-14 13:36:17,897 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:36:17,898 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:36:17,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:36:21,125 INFO L134 CoverageAnalysis]: Checked inductivity of 600 backedges. 0 proven. 600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:36:21,125 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:36:21,125 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1674857216] [2022-12-14 13:36:21,126 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1674857216] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:36:21,126 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [464709966] [2022-12-14 13:36:21,126 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 13:36:21,126 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:36:21,126 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:36:21,127 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:36:21,128 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2022-12-14 13:36:21,176 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2022-12-14 13:36:21,176 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:36:21,178 WARN L261 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 132 conjunts are in the unsatisfiable core [2022-12-14 13:36:21,180 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:36:30,755 INFO L134 CoverageAnalysis]: Checked inductivity of 600 backedges. 0 proven. 600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:36:30,755 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:36:38,838 INFO L134 CoverageAnalysis]: Checked inductivity of 600 backedges. 0 proven. 600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:36:38,838 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [464709966] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:36:38,838 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [922711039] [2022-12-14 13:36:38,839 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-12-14 13:36:38,839 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:36:38,839 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:36:38,839 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:36:38,839 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:36:38,940 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:36:41,248 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '21484#(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 [2022-12-14 13:36:41,248 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:36:41,248 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:36:41,248 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 57, 57] total 141 [2022-12-14 13:36:41,249 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1291949501] [2022-12-14 13:36:41,249 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:36:41,249 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 141 states [2022-12-14 13:36:41,249 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:36:41,250 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 141 interpolants. [2022-12-14 13:36:41,251 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=497, Invalid=21853, Unknown=0, NotChecked=0, Total=22350 [2022-12-14 13:36:41,251 INFO L87 Difference]: Start difference. First operand 59 states and 60 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) [2022-12-14 13:36:59,091 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:36:59,091 INFO L93 Difference]: Finished difference Result 94 states and 97 transitions. [2022-12-14 13:36:59,091 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2022-12-14 13:36:59,092 INFO L78 Accepts]: Start accepts. Automaton has 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) Word has length 58 [2022-12-14 13:36:59,092 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:36:59,092 INFO L225 Difference]: With dead ends: 94 [2022-12-14 13:36:59,092 INFO L226 Difference]: Without dead ends: 60 [2022-12-14 13:36:59,093 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 259 GetRequests, 79 SyntacticMatches, 2 SemanticMatches, 178 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8285 ImplicationChecksByTransitivity, 33.4s TimeCoverageRelationStatistics Valid=956, Invalid=31264, Unknown=0, NotChecked=0, Total=32220 [2022-12-14 13:36:59,093 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 182 mSDsluCounter, 178 mSDsCounter, 0 mSdLazyCounter, 5716 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 182 SdHoareTripleChecker+Valid, 180 SdHoareTripleChecker+Invalid, 5724 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 5716 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.7s IncrementalHoareTripleChecker+Time [2022-12-14 13:36:59,094 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [182 Valid, 180 Invalid, 5724 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 5716 Invalid, 0 Unknown, 0 Unchecked, 3.7s Time] [2022-12-14 13:36:59,094 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2022-12-14 13:36:59,152 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2022-12-14 13:36:59,152 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 59 states have (on average 1.0338983050847457) internal successors, (61), 59 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) [2022-12-14 13:36:59,152 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2022-12-14 13:36:59,152 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 58 [2022-12-14 13:36:59,152 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:36:59,153 INFO L495 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2022-12-14 13:36:59,153 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has 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) [2022-12-14 13:36:59,153 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2022-12-14 13:36:59,153 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-12-14 13:36:59,153 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:36:59,153 INFO L195 NwaCegarLoop]: trace histogram [25, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:36:59,157 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Forceful destruction successful, exit code 0 [2022-12-14 13:36:59,353 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2022-12-14 13:36:59,354 INFO L420 AbstractCegarLoop]: === Iteration 51 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:36:59,354 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:36:59,355 INFO L85 PathProgramCache]: Analyzing trace with hash -1899908402, now seen corresponding path program 45 times [2022-12-14 13:36:59,355 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:36:59,355 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [560814327] [2022-12-14 13:36:59,355 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:36:59,356 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:36:59,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:37:01,201 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 276 proven. 349 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:37:01,201 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:37:01,201 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [560814327] [2022-12-14 13:37:01,201 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [560814327] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:37:01,201 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1639337151] [2022-12-14 13:37:01,201 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 13:37:01,201 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:37:01,201 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:37:01,202 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:37:01,203 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Waiting until timeout for monitored process [2022-12-14 13:37:01,246 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 13:37:01,246 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:37:01,247 INFO L263 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 56 conjunts are in the unsatisfiable core [2022-12-14 13:37:01,248 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:37:03,315 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 300 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:37:03,315 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:37:05,445 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 325 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:37:05,446 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1639337151] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:37:05,446 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [738279018] [2022-12-14 13:37:05,446 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-12-14 13:37:05,446 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:37:05,446 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:37:05,446 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:37:05,446 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:37:05,580 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:37:06,776 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '22324#(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 [2022-12-14 13:37:06,776 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:37:06,776 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:37:06,776 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 55, 55] total 134 [2022-12-14 13:37:06,776 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1179287323] [2022-12-14 13:37:06,777 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:37:06,777 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 134 states [2022-12-14 13:37:06,777 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:37:06,778 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 134 interpolants. [2022-12-14 13:37:06,779 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3373, Invalid=16933, Unknown=0, NotChecked=0, Total=20306 [2022-12-14 13:37:06,779 INFO L87 Difference]: Start difference. First operand 60 states and 61 transitions. Second operand has 134 states, 134 states have (on average 1.0597014925373134) internal successors, (142), 134 states have internal predecessors, (142), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:37:08,362 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:37:08,362 INFO L93 Difference]: Finished difference Result 65 states and 66 transitions. [2022-12-14 13:37:08,362 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2022-12-14 13:37:08,362 INFO L78 Accepts]: Start accepts. Automaton has has 134 states, 134 states have (on average 1.0597014925373134) internal successors, (142), 134 states have internal predecessors, (142), 0 states have call successors, (0), 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 59 [2022-12-14 13:37:08,362 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:37:08,363 INFO L225 Difference]: With dead ends: 65 [2022-12-14 13:37:08,363 INFO L226 Difference]: Without dead ends: 61 [2022-12-14 13:37:08,364 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 258 GetRequests, 63 SyntacticMatches, 27 SemanticMatches, 168 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15467 ImplicationChecksByTransitivity, 7.6s TimeCoverageRelationStatistics Valid=6588, Invalid=22142, Unknown=0, NotChecked=0, Total=28730 [2022-12-14 13:37:08,364 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 398 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 358 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 398 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 358 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 358 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 13:37:08,364 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [398 Valid, 15 Invalid, 358 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 358 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 13:37:08,365 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2022-12-14 13:37:08,429 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2022-12-14 13:37:08,429 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 60 states have (on average 1.0333333333333334) internal successors, (62), 60 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:37:08,429 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 62 transitions. [2022-12-14 13:37:08,429 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 62 transitions. Word has length 59 [2022-12-14 13:37:08,429 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:37:08,429 INFO L495 AbstractCegarLoop]: Abstraction has 61 states and 62 transitions. [2022-12-14 13:37:08,430 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 134 states, 134 states have (on average 1.0597014925373134) internal successors, (142), 134 states have internal predecessors, (142), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:37:08,430 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 62 transitions. [2022-12-14 13:37:08,430 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2022-12-14 13:37:08,430 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:37:08,430 INFO L195 NwaCegarLoop]: trace histogram [25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:37:08,435 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Forceful destruction successful, exit code 0 [2022-12-14 13:37:08,630 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50,48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:37:08,631 INFO L420 AbstractCegarLoop]: === Iteration 52 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:37:08,632 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:37:08,632 INFO L85 PathProgramCache]: Analyzing trace with hash 1225279894, now seen corresponding path program 46 times [2022-12-14 13:37:08,632 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:37:08,633 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1411862971] [2022-12-14 13:37:08,633 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:37:08,633 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:37:08,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:37:12,257 INFO L134 CoverageAnalysis]: Checked inductivity of 650 backedges. 0 proven. 650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:37:12,257 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:37:12,257 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1411862971] [2022-12-14 13:37:12,257 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1411862971] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:37:12,257 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1727821145] [2022-12-14 13:37:12,258 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 13:37:12,258 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:37:12,258 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:37:12,258 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:37:12,259 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Waiting until timeout for monitored process [2022-12-14 13:37:12,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:37:12,303 WARN L261 TraceCheckSpWp]: Trace formula consists of 226 conjuncts, 134 conjunts are in the unsatisfiable core [2022-12-14 13:37:12,305 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:37:21,007 INFO L134 CoverageAnalysis]: Checked inductivity of 650 backedges. 0 proven. 650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:37:21,007 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:37:27,816 INFO L134 CoverageAnalysis]: Checked inductivity of 650 backedges. 0 proven. 650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:37:27,816 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1727821145] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:37:27,816 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1110493413] [2022-12-14 13:37:27,817 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-12-14 13:37:27,817 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:37:27,817 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:37:27,817 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:37:27,817 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:37:27,964 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:37:30,235 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '23149#(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 [2022-12-14 13:37:30,235 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:37:30,235 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:37:30,235 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59, 59] total 173 [2022-12-14 13:37:30,235 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1959416537] [2022-12-14 13:37:30,235 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:37:30,236 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 173 states [2022-12-14 13:37:30,236 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:37:30,237 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 173 interpolants. [2022-12-14 13:37:30,238 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=759, Invalid=32183, Unknown=0, NotChecked=0, Total=32942 [2022-12-14 13:37:30,238 INFO L87 Difference]: Start difference. First operand 61 states and 62 transitions. Second operand has 173 states, 173 states have (on average 1.023121387283237) internal successors, (177), 173 states have internal predecessors, (177), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:37:45,163 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:37:45,163 INFO L93 Difference]: Finished difference Result 97 states and 100 transitions. [2022-12-14 13:37:45,163 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2022-12-14 13:37:45,163 INFO L78 Accepts]: Start accepts. Automaton has has 173 states, 173 states have (on average 1.023121387283237) internal successors, (177), 173 states have internal predecessors, (177), 0 states have call successors, (0), 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 60 [2022-12-14 13:37:45,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:37:45,163 INFO L225 Difference]: With dead ends: 97 [2022-12-14 13:37:45,163 INFO L226 Difference]: Without dead ends: 62 [2022-12-14 13:37:45,165 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 269 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 212 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15786 ImplicationChecksByTransitivity, 29.7s TimeCoverageRelationStatistics Valid=1276, Invalid=44306, Unknown=0, NotChecked=0, Total=45582 [2022-12-14 13:37:45,166 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 197 mSDsluCounter, 195 mSDsCounter, 0 mSdLazyCounter, 6256 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 197 SdHoareTripleChecker+Valid, 197 SdHoareTripleChecker+Invalid, 6264 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 6256 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.6s IncrementalHoareTripleChecker+Time [2022-12-14 13:37:45,166 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [197 Valid, 197 Invalid, 6264 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 6256 Invalid, 0 Unknown, 0 Unchecked, 3.6s Time] [2022-12-14 13:37:45,166 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2022-12-14 13:37:45,239 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 62. [2022-12-14 13:37:45,239 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 61 states have (on average 1.0327868852459017) internal successors, (63), 61 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:37:45,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 63 transitions. [2022-12-14 13:37:45,240 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 63 transitions. Word has length 60 [2022-12-14 13:37:45,240 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:37:45,240 INFO L495 AbstractCegarLoop]: Abstraction has 62 states and 63 transitions. [2022-12-14 13:37:45,240 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 173 states, 173 states have (on average 1.023121387283237) internal successors, (177), 173 states have internal predecessors, (177), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:37:45,240 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 63 transitions. [2022-12-14 13:37:45,240 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-12-14 13:37:45,240 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:37:45,240 INFO L195 NwaCegarLoop]: trace histogram [26, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:37:45,245 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Ended with exit code 0 [2022-12-14 13:37:45,441 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable51 [2022-12-14 13:37:45,441 INFO L420 AbstractCegarLoop]: === Iteration 53 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:37:45,442 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:37:45,442 INFO L85 PathProgramCache]: Analyzing trace with hash 289433269, now seen corresponding path program 47 times [2022-12-14 13:37:45,442 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:37:45,442 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1784451189] [2022-12-14 13:37:45,443 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:37:45,443 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:37:45,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:37:47,669 INFO L134 CoverageAnalysis]: Checked inductivity of 676 backedges. 300 proven. 376 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:37:47,669 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:37:47,669 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1784451189] [2022-12-14 13:37:47,669 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1784451189] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:37:47,669 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [521273420] [2022-12-14 13:37:47,669 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 13:37:47,670 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:37:47,670 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:37:47,670 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:37:47,671 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Waiting until timeout for monitored process [2022-12-14 13:37:47,719 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2022-12-14 13:37:47,719 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:37:47,720 INFO L263 TraceCheckSpWp]: Trace formula consists of 229 conjuncts, 58 conjunts are in the unsatisfiable core [2022-12-14 13:37:47,721 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:37:50,058 INFO L134 CoverageAnalysis]: Checked inductivity of 676 backedges. 325 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:37:50,059 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:37:52,105 INFO L134 CoverageAnalysis]: Checked inductivity of 676 backedges. 351 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:37:52,105 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [521273420] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:37:52,106 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2119395974] [2022-12-14 13:37:52,106 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-12-14 13:37:52,106 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:37:52,106 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:37:52,106 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:37:52,107 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:37:52,229 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:37:53,488 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '24020#(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 [2022-12-14 13:37:53,488 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:37:53,488 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:37:53,488 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 57, 57] total 139 [2022-12-14 13:37:53,488 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1557951150] [2022-12-14 13:37:53,489 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:37:53,489 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 139 states [2022-12-14 13:37:53,489 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:37:53,490 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 139 interpolants. [2022-12-14 13:37:53,493 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3623, Invalid=18133, Unknown=0, NotChecked=0, Total=21756 [2022-12-14 13:37:53,494 INFO L87 Difference]: Start difference. First operand 62 states and 63 transitions. Second operand has 139 states, 139 states have (on average 1.0575539568345325) internal successors, (147), 139 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:37:55,268 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:37:55,268 INFO L93 Difference]: Finished difference Result 67 states and 68 transitions. [2022-12-14 13:37:55,269 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2022-12-14 13:37:55,269 INFO L78 Accepts]: Start accepts. Automaton has has 139 states, 139 states have (on average 1.0575539568345325) internal successors, (147), 139 states have internal predecessors, (147), 0 states have call successors, (0), 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 61 [2022-12-14 13:37:55,269 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:37:55,269 INFO L225 Difference]: With dead ends: 67 [2022-12-14 13:37:55,269 INFO L226 Difference]: Without dead ends: 63 [2022-12-14 13:37:55,270 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 267 GetRequests, 65 SyntacticMatches, 28 SemanticMatches, 174 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16616 ImplicationChecksByTransitivity, 8.1s TimeCoverageRelationStatistics Valid=7083, Invalid=23717, Unknown=0, NotChecked=0, Total=30800 [2022-12-14 13:37:55,270 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 379 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 558 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 379 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 558 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 558 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 13:37:55,271 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [379 Valid, 29 Invalid, 558 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 558 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 13:37:55,271 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2022-12-14 13:37:55,336 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2022-12-14 13:37:55,336 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 62 states have (on average 1.032258064516129) internal successors, (64), 62 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:37:55,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 64 transitions. [2022-12-14 13:37:55,337 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 64 transitions. Word has length 61 [2022-12-14 13:37:55,337 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:37:55,337 INFO L495 AbstractCegarLoop]: Abstraction has 63 states and 64 transitions. [2022-12-14 13:37:55,337 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 139 states, 139 states have (on average 1.0575539568345325) internal successors, (147), 139 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:37:55,337 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 64 transitions. [2022-12-14 13:37:55,337 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2022-12-14 13:37:55,337 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:37:55,337 INFO L195 NwaCegarLoop]: trace histogram [26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:37:55,341 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Ended with exit code 0 [2022-12-14 13:37:55,538 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable52 [2022-12-14 13:37:55,538 INFO L420 AbstractCegarLoop]: === Iteration 54 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:37:55,539 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:37:55,539 INFO L85 PathProgramCache]: Analyzing trace with hash 375394959, now seen corresponding path program 48 times [2022-12-14 13:37:55,539 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:37:55,539 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [576886972] [2022-12-14 13:37:55,540 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:37:55,540 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:37:55,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:37:59,334 INFO L134 CoverageAnalysis]: Checked inductivity of 702 backedges. 0 proven. 702 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:37:59,335 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:37:59,335 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [576886972] [2022-12-14 13:37:59,335 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [576886972] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:37:59,335 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [438839085] [2022-12-14 13:37:59,335 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 13:37:59,335 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:37:59,335 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:37:59,336 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:37:59,336 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Waiting until timeout for monitored process [2022-12-14 13:37:59,380 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 13:37:59,380 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:37:59,382 WARN L261 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 140 conjunts are in the unsatisfiable core [2022-12-14 13:37:59,384 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:38:07,140 INFO L134 CoverageAnalysis]: Checked inductivity of 702 backedges. 0 proven. 702 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:38:07,141 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:38:14,582 INFO L134 CoverageAnalysis]: Checked inductivity of 702 backedges. 0 proven. 702 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:38:14,582 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [438839085] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:38:14,582 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1153874216] [2022-12-14 13:38:14,583 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-12-14 13:38:14,583 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:38:14,583 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:38:14,583 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:38:14,583 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:38:14,686 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:38:17,068 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '24845#(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 [2022-12-14 13:38:17,068 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:38:17,068 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:38:17,068 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 61, 61] total 151 [2022-12-14 13:38:17,068 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [807373886] [2022-12-14 13:38:17,068 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:38:17,068 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 151 states [2022-12-14 13:38:17,068 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:38:17,069 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 151 interpolants. [2022-12-14 13:38:17,070 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=531, Invalid=24909, Unknown=0, NotChecked=0, Total=25440 [2022-12-14 13:38:17,070 INFO L87 Difference]: Start difference. First operand 63 states and 64 transitions. Second operand has 151 states, 151 states have (on average 1.0264900662251655) internal successors, (155), 151 states have internal predecessors, (155), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:38:34,345 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:38:34,345 INFO L93 Difference]: Finished difference Result 100 states and 103 transitions. [2022-12-14 13:38:34,345 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2022-12-14 13:38:34,345 INFO L78 Accepts]: Start accepts. Automaton has has 151 states, 151 states have (on average 1.0264900662251655) internal successors, (155), 151 states have internal predecessors, (155), 0 states have call successors, (0), 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 62 [2022-12-14 13:38:34,346 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:38:34,346 INFO L225 Difference]: With dead ends: 100 [2022-12-14 13:38:34,346 INFO L226 Difference]: Without dead ends: 64 [2022-12-14 13:38:34,347 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 277 GetRequests, 85 SyntacticMatches, 2 SemanticMatches, 190 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9450 ImplicationChecksByTransitivity, 30.7s TimeCoverageRelationStatistics Valid=1022, Invalid=35650, Unknown=0, NotChecked=0, Total=36672 [2022-12-14 13:38:34,348 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 165 mSDsluCounter, 218 mSDsCounter, 0 mSdLazyCounter, 6993 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 165 SdHoareTripleChecker+Valid, 220 SdHoareTripleChecker+Invalid, 7001 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 6993 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.3s IncrementalHoareTripleChecker+Time [2022-12-14 13:38:34,348 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [165 Valid, 220 Invalid, 7001 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 6993 Invalid, 0 Unknown, 0 Unchecked, 4.3s Time] [2022-12-14 13:38:34,348 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2022-12-14 13:38:34,416 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2022-12-14 13:38:34,416 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 63 states have (on average 1.0317460317460319) internal successors, (65), 63 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:38:34,416 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 65 transitions. [2022-12-14 13:38:34,416 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 65 transitions. Word has length 62 [2022-12-14 13:38:34,416 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:38:34,416 INFO L495 AbstractCegarLoop]: Abstraction has 64 states and 65 transitions. [2022-12-14 13:38:34,417 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 151 states, 151 states have (on average 1.0264900662251655) internal successors, (155), 151 states have internal predecessors, (155), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:38:34,417 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 65 transitions. [2022-12-14 13:38:34,417 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2022-12-14 13:38:34,417 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:38:34,417 INFO L195 NwaCegarLoop]: trace histogram [27, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:38:34,421 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Ended with exit code 0 [2022-12-14 13:38:34,617 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53,51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:38:34,618 INFO L420 AbstractCegarLoop]: === Iteration 55 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:38:34,618 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:38:34,619 INFO L85 PathProgramCache]: Analyzing trace with hash -1325046802, now seen corresponding path program 49 times [2022-12-14 13:38:34,619 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:38:34,620 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1667212851] [2022-12-14 13:38:34,620 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:38:34,620 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:38:34,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:38:36,726 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 325 proven. 404 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:38:36,727 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:38:36,727 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1667212851] [2022-12-14 13:38:36,727 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1667212851] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:38:36,727 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2042325878] [2022-12-14 13:38:36,727 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 13:38:36,727 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:38:36,727 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:38:36,728 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:38:36,729 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Waiting until timeout for monitored process [2022-12-14 13:38:36,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:38:36,772 INFO L263 TraceCheckSpWp]: Trace formula consists of 235 conjuncts, 60 conjunts are in the unsatisfiable core [2022-12-14 13:38:36,774 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:38:39,620 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 351 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:38:39,620 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:38:41,936 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 378 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:38:41,936 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2042325878] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:38:41,937 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1620308829] [2022-12-14 13:38:41,937 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-12-14 13:38:41,938 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:38:41,938 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:38:41,938 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:38:41,938 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:38:42,073 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:38:43,114 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '25743#(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 [2022-12-14 13:38:43,114 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:38:43,114 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:38:43,114 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 59, 59] total 144 [2022-12-14 13:38:43,114 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1711664321] [2022-12-14 13:38:43,114 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:38:43,115 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 144 states [2022-12-14 13:38:43,115 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:38:43,116 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 144 interpolants. [2022-12-14 13:38:43,117 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3882, Invalid=19374, Unknown=0, NotChecked=0, Total=23256 [2022-12-14 13:38:43,117 INFO L87 Difference]: Start difference. First operand 64 states and 65 transitions. Second operand has 144 states, 144 states have (on average 1.0555555555555556) internal successors, (152), 144 states have internal predecessors, (152), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:38:44,833 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:38:44,833 INFO L93 Difference]: Finished difference Result 69 states and 70 transitions. [2022-12-14 13:38:44,833 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2022-12-14 13:38:44,833 INFO L78 Accepts]: Start accepts. Automaton has has 144 states, 144 states have (on average 1.0555555555555556) internal successors, (152), 144 states have internal predecessors, (152), 0 states have call successors, (0), 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 63 [2022-12-14 13:38:44,834 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:38:44,834 INFO L225 Difference]: With dead ends: 69 [2022-12-14 13:38:44,834 INFO L226 Difference]: Without dead ends: 65 [2022-12-14 13:38:44,836 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 276 GetRequests, 67 SyntacticMatches, 29 SemanticMatches, 180 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17806 ImplicationChecksByTransitivity, 8.6s TimeCoverageRelationStatistics Valid=7596, Invalid=25346, Unknown=0, NotChecked=0, Total=32942 [2022-12-14 13:38:44,836 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 319 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 358 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 319 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 358 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 358 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 13:38:44,836 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [319 Valid, 12 Invalid, 358 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 358 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 13:38:44,836 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2022-12-14 13:38:44,910 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2022-12-14 13:38:44,910 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 64 states have (on average 1.03125) internal successors, (66), 64 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) [2022-12-14 13:38:44,910 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 66 transitions. [2022-12-14 13:38:44,910 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 66 transitions. Word has length 63 [2022-12-14 13:38:44,910 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:38:44,911 INFO L495 AbstractCegarLoop]: Abstraction has 65 states and 66 transitions. [2022-12-14 13:38:44,911 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 144 states, 144 states have (on average 1.0555555555555556) internal successors, (152), 144 states have internal predecessors, (152), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:38:44,911 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 66 transitions. [2022-12-14 13:38:44,911 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-12-14 13:38:44,911 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:38:44,911 INFO L195 NwaCegarLoop]: trace histogram [27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:38:44,915 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Ended with exit code 0 [2022-12-14 13:38:45,112 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54,52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:38:45,112 INFO L420 AbstractCegarLoop]: === Iteration 56 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:38:45,113 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:38:45,113 INFO L85 PathProgramCache]: Analyzing trace with hash 1866120310, now seen corresponding path program 50 times [2022-12-14 13:38:45,113 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:38:45,114 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [375903233] [2022-12-14 13:38:45,114 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:38:45,114 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:38:45,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:38:48,734 INFO L134 CoverageAnalysis]: Checked inductivity of 756 backedges. 0 proven. 756 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:38:48,734 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:38:48,734 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [375903233] [2022-12-14 13:38:48,734 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [375903233] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:38:48,734 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1396175451] [2022-12-14 13:38:48,735 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 13:38:48,735 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:38:48,735 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:38:48,735 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:38:48,736 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Waiting until timeout for monitored process [2022-12-14 13:38:48,792 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2022-12-14 13:38:48,792 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:38:48,794 WARN L261 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 145 conjunts are in the unsatisfiable core [2022-12-14 13:38:48,795 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:39:00,045 INFO L134 CoverageAnalysis]: Checked inductivity of 756 backedges. 0 proven. 756 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:39:00,045 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:39:11,113 INFO L134 CoverageAnalysis]: Checked inductivity of 756 backedges. 0 proven. 756 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:39:11,114 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1396175451] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:39:11,114 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1286036380] [2022-12-14 13:39:11,114 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-12-14 13:39:11,114 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:39:11,114 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:39:11,114 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:39:11,115 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:39:11,209 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:39:13,666 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '26595#(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 [2022-12-14 13:39:13,666 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:39:13,666 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:39:13,666 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 63, 63] total 156 [2022-12-14 13:39:13,667 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1312988226] [2022-12-14 13:39:13,667 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:39:13,667 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 156 states [2022-12-14 13:39:13,667 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:39:13,667 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 156 interpolants. [2022-12-14 13:39:13,668 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=580, Invalid=26480, Unknown=0, NotChecked=0, Total=27060 [2022-12-14 13:39:13,669 INFO L87 Difference]: Start difference. First operand 65 states and 66 transitions. Second operand has 156 states, 156 states have (on average 1.0256410256410255) internal successors, (160), 156 states have internal predecessors, (160), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:39:55,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:39:55,635 INFO L93 Difference]: Finished difference Result 106 states and 110 transitions. [2022-12-14 13:39:55,635 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 97 states. [2022-12-14 13:39:55,635 INFO L78 Accepts]: Start accepts. Automaton has has 156 states, 156 states have (on average 1.0256410256410255) internal successors, (160), 156 states have internal predecessors, (160), 0 states have call successors, (0), 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 64 [2022-12-14 13:39:55,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:39:55,636 INFO L225 Difference]: With dead ends: 106 [2022-12-14 13:39:55,636 INFO L226 Difference]: Without dead ends: 67 [2022-12-14 13:39:55,639 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 318 GetRequests, 88 SyntacticMatches, 2 SemanticMatches, 228 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13497 ImplicationChecksByTransitivity, 59.5s TimeCoverageRelationStatistics Valid=2311, Invalid=50359, Unknown=0, NotChecked=0, Total=52670 [2022-12-14 13:39:55,639 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 1375 mSDsluCounter, 152 mSDsCounter, 0 mSdLazyCounter, 8923 mSolverCounterSat, 71 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1375 SdHoareTripleChecker+Valid, 154 SdHoareTripleChecker+Invalid, 8994 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 71 IncrementalHoareTripleChecker+Valid, 8923 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.1s IncrementalHoareTripleChecker+Time [2022-12-14 13:39:55,639 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1375 Valid, 154 Invalid, 8994 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [71 Valid, 8923 Invalid, 0 Unknown, 0 Unchecked, 6.1s Time] [2022-12-14 13:39:55,639 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2022-12-14 13:39:55,721 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2022-12-14 13:39:55,721 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 66 states have (on average 1.0303030303030303) internal successors, (68), 66 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:39:55,721 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 68 transitions. [2022-12-14 13:39:55,721 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 68 transitions. Word has length 64 [2022-12-14 13:39:55,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:39:55,721 INFO L495 AbstractCegarLoop]: Abstraction has 67 states and 68 transitions. [2022-12-14 13:39:55,721 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 156 states, 156 states have (on average 1.0256410256410255) internal successors, (160), 156 states have internal predecessors, (160), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:39:55,721 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 68 transitions. [2022-12-14 13:39:55,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2022-12-14 13:39:55,722 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:39:55,722 INFO L195 NwaCegarLoop]: trace histogram [28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:39:55,726 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Forceful destruction successful, exit code 0 [2022-12-14 13:39:55,922 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable55,53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:39:55,923 INFO L420 AbstractCegarLoop]: === Iteration 57 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:39:55,923 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:39:55,924 INFO L85 PathProgramCache]: Analyzing trace with hash -1008159953, now seen corresponding path program 51 times [2022-12-14 13:39:55,924 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:39:55,924 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2039164889] [2022-12-14 13:39:55,925 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:39:55,925 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:39:55,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:40:00,095 INFO L134 CoverageAnalysis]: Checked inductivity of 812 backedges. 0 proven. 812 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:40:00,095 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:40:00,095 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2039164889] [2022-12-14 13:40:00,095 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2039164889] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:40:00,095 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1193017958] [2022-12-14 13:40:00,095 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 13:40:00,095 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:40:00,095 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:40:00,096 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:40:00,097 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Waiting until timeout for monitored process [2022-12-14 13:40:00,138 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 13:40:00,139 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:40:00,141 WARN L261 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 148 conjunts are in the unsatisfiable core [2022-12-14 13:40:00,142 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:40:08,168 INFO L134 CoverageAnalysis]: Checked inductivity of 812 backedges. 0 proven. 812 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:40:08,168 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:40:17,731 INFO L134 CoverageAnalysis]: Checked inductivity of 812 backedges. 0 proven. 812 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:40:17,731 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1193017958] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:40:17,731 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [455672757] [2022-12-14 13:40:17,732 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-12-14 13:40:17,732 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:40:17,732 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:40:17,732 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:40:17,732 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:40:17,822 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:40:20,470 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '27611#(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 [2022-12-14 13:40:20,470 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:40:20,470 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:40:20,470 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 65, 65] total 161 [2022-12-14 13:40:20,470 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1711682147] [2022-12-14 13:40:20,470 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:40:20,470 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 161 states [2022-12-14 13:40:20,470 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:40:20,471 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 161 interpolants. [2022-12-14 13:40:20,472 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=565, Invalid=28165, Unknown=0, NotChecked=0, Total=28730 [2022-12-14 13:40:20,473 INFO L87 Difference]: Start difference. First operand 67 states and 68 transitions. Second operand has 161 states, 161 states have (on average 1.0248447204968945) internal successors, (165), 161 states have internal predecessors, (165), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:40:39,772 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:40:39,772 INFO L93 Difference]: Finished difference Result 106 states and 109 transitions. [2022-12-14 13:40:39,773 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2022-12-14 13:40:39,773 INFO L78 Accepts]: Start accepts. Automaton has has 161 states, 161 states have (on average 1.0248447204968945) internal successors, (165), 161 states have internal predecessors, (165), 0 states have call successors, (0), 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 66 [2022-12-14 13:40:39,773 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:40:39,773 INFO L225 Difference]: With dead ends: 106 [2022-12-14 13:40:39,773 INFO L226 Difference]: Without dead ends: 68 [2022-12-14 13:40:39,775 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 295 GetRequests, 91 SyntacticMatches, 2 SemanticMatches, 202 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10691 ImplicationChecksByTransitivity, 34.8s TimeCoverageRelationStatistics Valid=1088, Invalid=40324, Unknown=0, NotChecked=0, Total=41412 [2022-12-14 13:40:39,775 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 180 mSDsluCounter, 237 mSDsCounter, 0 mSdLazyCounter, 7997 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 180 SdHoareTripleChecker+Valid, 239 SdHoareTripleChecker+Invalid, 8005 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 7997 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.9s IncrementalHoareTripleChecker+Time [2022-12-14 13:40:39,775 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [180 Valid, 239 Invalid, 8005 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 7997 Invalid, 0 Unknown, 0 Unchecked, 4.9s Time] [2022-12-14 13:40:39,775 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2022-12-14 13:40:39,870 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2022-12-14 13:40:39,870 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 67 states have (on average 1.0298507462686568) internal successors, (69), 67 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:40:39,871 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 69 transitions. [2022-12-14 13:40:39,871 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 69 transitions. Word has length 66 [2022-12-14 13:40:39,871 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:40:39,871 INFO L495 AbstractCegarLoop]: Abstraction has 68 states and 69 transitions. [2022-12-14 13:40:39,871 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 161 states, 161 states have (on average 1.0248447204968945) internal successors, (165), 161 states have internal predecessors, (165), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:40:39,871 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 69 transitions. [2022-12-14 13:40:39,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2022-12-14 13:40:39,872 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:40:39,872 INFO L195 NwaCegarLoop]: trace histogram [29, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:40:39,876 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Ended with exit code 0 [2022-12-14 13:40:40,072 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable56 [2022-12-14 13:40:40,073 INFO L420 AbstractCegarLoop]: === Iteration 58 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:40:40,073 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:40:40,073 INFO L85 PathProgramCache]: Analyzing trace with hash -21480178, now seen corresponding path program 52 times [2022-12-14 13:40:40,074 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:40:40,074 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1882039812] [2022-12-14 13:40:40,074 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:40:40,075 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:40:40,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:40:42,523 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 378 proven. 463 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:40:42,523 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:40:42,523 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1882039812] [2022-12-14 13:40:42,523 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1882039812] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:40:42,523 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1990603665] [2022-12-14 13:40:42,523 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 13:40:42,523 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:40:42,523 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:40:42,524 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:40:42,524 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Waiting until timeout for monitored process [2022-12-14 13:40:42,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:40:42,570 INFO L263 TraceCheckSpWp]: Trace formula consists of 247 conjuncts, 64 conjunts are in the unsatisfiable core [2022-12-14 13:40:42,571 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:40:44,758 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 406 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:40:44,758 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:40:46,947 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 435 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:40:46,947 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1990603665] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:40:46,947 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [915633616] [2022-12-14 13:40:46,948 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-12-14 13:40:46,948 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:40:46,948 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:40:46,948 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:40:46,948 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:40:47,038 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:40:48,116 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '28567#(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 [2022-12-14 13:40:48,116 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:40:48,116 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:40:48,116 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [64, 63, 63] total 154 [2022-12-14 13:40:48,116 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1346599130] [2022-12-14 13:40:48,116 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:40:48,117 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 154 states [2022-12-14 13:40:48,117 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:40:48,117 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 154 interpolants. [2022-12-14 13:40:48,118 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4427, Invalid=21979, Unknown=0, NotChecked=0, Total=26406 [2022-12-14 13:40:48,119 INFO L87 Difference]: Start difference. First operand 68 states and 69 transitions. Second operand has 154 states, 154 states have (on average 1.051948051948052) internal successors, (162), 154 states have internal predecessors, (162), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:40:50,053 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:40:50,053 INFO L93 Difference]: Finished difference Result 73 states and 74 transitions. [2022-12-14 13:40:50,054 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2022-12-14 13:40:50,054 INFO L78 Accepts]: Start accepts. Automaton has has 154 states, 154 states have (on average 1.051948051948052) internal successors, (162), 154 states have internal predecessors, (162), 0 states have call successors, (0), 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 67 [2022-12-14 13:40:50,054 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:40:50,054 INFO L225 Difference]: With dead ends: 73 [2022-12-14 13:40:50,054 INFO L226 Difference]: Without dead ends: 69 [2022-12-14 13:40:50,056 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 294 GetRequests, 71 SyntacticMatches, 31 SemanticMatches, 192 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20309 ImplicationChecksByTransitivity, 8.4s TimeCoverageRelationStatistics Valid=8676, Invalid=28766, Unknown=0, NotChecked=0, Total=37442 [2022-12-14 13:40:50,056 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 154 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 499 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 154 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 499 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 499 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 13:40:50,056 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [154 Valid, 21 Invalid, 499 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 499 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 13:40:50,056 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2022-12-14 13:40:50,136 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2022-12-14 13:40:50,136 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 68 states have (on average 1.0294117647058822) internal successors, (70), 68 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:40:50,136 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 70 transitions. [2022-12-14 13:40:50,136 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 70 transitions. Word has length 67 [2022-12-14 13:40:50,136 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:40:50,136 INFO L495 AbstractCegarLoop]: Abstraction has 69 states and 70 transitions. [2022-12-14 13:40:50,137 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 154 states, 154 states have (on average 1.051948051948052) internal successors, (162), 154 states have internal predecessors, (162), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:40:50,137 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 70 transitions. [2022-12-14 13:40:50,137 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2022-12-14 13:40:50,137 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:40:50,137 INFO L195 NwaCegarLoop]: trace histogram [29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:40:50,141 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Forceful destruction successful, exit code 0 [2022-12-14 13:40:50,337 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable57 [2022-12-14 13:40:50,338 INFO L420 AbstractCegarLoop]: === Iteration 59 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:40:50,339 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:40:50,339 INFO L85 PathProgramCache]: Analyzing trace with hash -672987306, now seen corresponding path program 53 times [2022-12-14 13:40:50,339 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:40:50,339 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1578701559] [2022-12-14 13:40:50,340 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:40:50,340 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:40:50,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:40:54,569 INFO L134 CoverageAnalysis]: Checked inductivity of 870 backedges. 0 proven. 870 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:40:54,569 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:40:54,569 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1578701559] [2022-12-14 13:40:54,569 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1578701559] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:40:54,569 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1127975832] [2022-12-14 13:40:54,569 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 13:40:54,569 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:40:54,569 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:40:54,570 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:40:54,571 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Waiting until timeout for monitored process [2022-12-14 13:40:54,626 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2022-12-14 13:40:54,626 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:40:54,629 WARN L261 TraceCheckSpWp]: Trace formula consists of 250 conjuncts, 153 conjunts are in the unsatisfiable core [2022-12-14 13:40:54,630 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:41:03,983 INFO L134 CoverageAnalysis]: Checked inductivity of 870 backedges. 0 proven. 870 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:41:03,983 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:41:13,625 INFO L134 CoverageAnalysis]: Checked inductivity of 870 backedges. 0 proven. 870 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:41:13,625 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1127975832] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:41:13,625 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [822460855] [2022-12-14 13:41:13,626 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-12-14 13:41:13,626 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:41:13,626 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:41:13,626 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:41:13,626 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:41:13,718 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:41:16,461 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '29473#(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 [2022-12-14 13:41:16,461 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:41:16,461 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:41:16,461 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 67, 67] total 166 [2022-12-14 13:41:16,461 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1405194625] [2022-12-14 13:41:16,461 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:41:16,462 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 166 states [2022-12-14 13:41:16,462 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:41:16,462 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 166 interpolants. [2022-12-14 13:41:16,463 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=616, Invalid=29834, Unknown=0, NotChecked=0, Total=30450 [2022-12-14 13:41:16,463 INFO L87 Difference]: Start difference. First operand 69 states and 70 transitions. Second operand has 166 states, 166 states have (on average 1.0240963855421688) internal successors, (170), 166 states have internal predecessors, (170), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:41:59,532 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:41:59,532 INFO L93 Difference]: Finished difference Result 112 states and 116 transitions. [2022-12-14 13:41:59,532 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 103 states. [2022-12-14 13:41:59,532 INFO L78 Accepts]: Start accepts. Automaton has has 166 states, 166 states have (on average 1.0240963855421688) internal successors, (170), 166 states have internal predecessors, (170), 0 states have call successors, (0), 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 68 [2022-12-14 13:41:59,533 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:41:59,533 INFO L225 Difference]: With dead ends: 112 [2022-12-14 13:41:59,533 INFO L226 Difference]: Without dead ends: 71 [2022-12-14 13:41:59,537 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 338 GetRequests, 94 SyntacticMatches, 2 SemanticMatches, 242 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15229 ImplicationChecksByTransitivity, 57.9s TimeCoverageRelationStatistics Valid=2523, Invalid=56769, Unknown=0, NotChecked=0, Total=59292 [2022-12-14 13:41:59,537 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 1564 mSDsluCounter, 173 mSDsCounter, 0 mSdLazyCounter, 9992 mSolverCounterSat, 76 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1564 SdHoareTripleChecker+Valid, 175 SdHoareTripleChecker+Invalid, 10068 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 76 IncrementalHoareTripleChecker+Valid, 9992 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.6s IncrementalHoareTripleChecker+Time [2022-12-14 13:41:59,538 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1564 Valid, 175 Invalid, 10068 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [76 Valid, 9992 Invalid, 0 Unknown, 0 Unchecked, 6.6s Time] [2022-12-14 13:41:59,538 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2022-12-14 13:41:59,651 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 71. [2022-12-14 13:41:59,651 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 70 states have (on average 1.0285714285714285) internal successors, (72), 70 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:41:59,651 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 72 transitions. [2022-12-14 13:41:59,651 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 72 transitions. Word has length 68 [2022-12-14 13:41:59,651 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:41:59,651 INFO L495 AbstractCegarLoop]: Abstraction has 71 states and 72 transitions. [2022-12-14 13:41:59,652 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 166 states, 166 states have (on average 1.0240963855421688) internal successors, (170), 166 states have internal predecessors, (170), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:41:59,652 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 72 transitions. [2022-12-14 13:41:59,652 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2022-12-14 13:41:59,652 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:41:59,652 INFO L195 NwaCegarLoop]: trace histogram [30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:41:59,656 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Forceful destruction successful, exit code 0 [2022-12-14 13:41:59,852 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable58,56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:41:59,853 INFO L420 AbstractCegarLoop]: === Iteration 60 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:41:59,853 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:41:59,854 INFO L85 PathProgramCache]: Analyzing trace with hash 26131407, now seen corresponding path program 54 times [2022-12-14 13:41:59,854 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:41:59,854 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1774437922] [2022-12-14 13:41:59,854 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:41:59,855 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:41:59,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:42:04,326 INFO L134 CoverageAnalysis]: Checked inductivity of 930 backedges. 0 proven. 930 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:42:04,326 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:42:04,326 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1774437922] [2022-12-14 13:42:04,326 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1774437922] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:42:04,326 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1960704555] [2022-12-14 13:42:04,326 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 13:42:04,326 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:42:04,326 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:42:04,327 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:42:04,328 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5cce19f-2db7-40af-ac00-6ac131385e0d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Waiting until timeout for monitored process [2022-12-14 13:42:04,373 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 13:42:04,373 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:42:04,376 WARN L261 TraceCheckSpWp]: Trace formula consists of 256 conjuncts, 156 conjunts are in the unsatisfiable core [2022-12-14 13:42:04,378 INFO L286 TraceCheckSpWp]: Computing forward predicates...