./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 8393723b Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/config/TaipanReach.xml -i ../../sv-benchmarks/c/loops-crafted-1/watermelon.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS --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-8393723 [2022-11-19 08:05:40,544 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-19 08:05:40,547 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-19 08:05:40,590 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-19 08:05:40,592 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-19 08:05:40,597 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-19 08:05:40,598 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-19 08:05:40,603 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-19 08:05:40,606 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-19 08:05:40,608 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-19 08:05:40,610 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-19 08:05:40,613 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-19 08:05:40,614 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-19 08:05:40,618 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-19 08:05:40,619 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-19 08:05:40,621 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-19 08:05:40,623 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-19 08:05:40,628 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-19 08:05:40,630 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-19 08:05:40,631 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-19 08:05:40,633 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-19 08:05:40,634 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-19 08:05:40,635 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-19 08:05:40,636 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-19 08:05:40,639 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-19 08:05:40,640 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-19 08:05:40,640 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-19 08:05:40,641 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-19 08:05:40,642 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-19 08:05:40,643 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-19 08:05:40,643 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-19 08:05:40,644 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-19 08:05:40,645 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-19 08:05:40,645 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-19 08:05:40,646 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-19 08:05:40,647 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-19 08:05:40,648 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-19 08:05:40,648 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-19 08:05:40,648 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-19 08:05:40,649 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-19 08:05:40,650 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-19 08:05:40,651 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-19 08:05:40,681 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-19 08:05:40,681 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-19 08:05:40,681 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-19 08:05:40,682 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-19 08:05:40,682 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-19 08:05:40,682 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-19 08:05:40,683 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-19 08:05:40,683 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-19 08:05:40,683 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-19 08:05:40,683 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-19 08:05:40,684 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-19 08:05:40,684 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-19 08:05:40,684 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-19 08:05:40,684 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-19 08:05:40,685 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-19 08:05:40,685 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-19 08:05:40,685 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-19 08:05:40,685 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-19 08:05:40,686 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-19 08:05:40,686 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-19 08:05:40,686 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-19 08:05:40,687 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-19 08:05:40,687 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-19 08:05:40,687 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-19 08:05:40,687 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-19 08:05:40,688 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-19 08:05:40,688 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-19 08:05:40,688 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-19 08:05:40,688 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-19 08:05:40,688 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-19 08:05:40,689 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-19 08:05:40,689 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-19 08:05:40,689 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-19 08:05:40,690 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-19 08:05:40,690 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-19 08:05:40,690 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-19 08:05:40,690 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-19 08:05:40,690 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-19 08:05:40,694 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-19 08:05:40,695 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-19 08:05:40,695 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-19 08:05:40,695 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_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> dda0b992ac1600896503297d86377b482d0a82ded923ea00c7e9ff3fed4db7e7 [2022-11-19 08:05:41,008 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-19 08:05:41,029 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-19 08:05:41,032 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-19 08:05:41,034 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-19 08:05:41,035 INFO L275 PluginConnector]: CDTParser initialized [2022-11-19 08:05:41,037 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/../../sv-benchmarks/c/loops-crafted-1/watermelon.c [2022-11-19 08:05:41,122 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/data/03ebc05a6/4bd3f96b600a40b292c9fa4c2321d6d9/FLAG3233ae30d [2022-11-19 08:05:41,682 INFO L306 CDTParser]: Found 1 translation units. [2022-11-19 08:05:41,682 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/sv-benchmarks/c/loops-crafted-1/watermelon.c [2022-11-19 08:05:41,694 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/data/03ebc05a6/4bd3f96b600a40b292c9fa4c2321d6d9/FLAG3233ae30d [2022-11-19 08:05:42,131 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/data/03ebc05a6/4bd3f96b600a40b292c9fa4c2321d6d9 [2022-11-19 08:05:42,134 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-19 08:05:42,135 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-19 08:05:42,137 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-19 08:05:42,138 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-19 08:05:42,146 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-19 08:05:42,150 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 08:05:42" (1/1) ... [2022-11-19 08:05:42,152 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6e4a4d88 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:05:42, skipping insertion in model container [2022-11-19 08:05:42,152 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 08:05:42" (1/1) ... [2022-11-19 08:05:42,161 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-19 08:05:42,183 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-19 08:05:42,368 WARN L234 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_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/sv-benchmarks/c/loops-crafted-1/watermelon.c[373,386] [2022-11-19 08:05:42,395 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-19 08:05:42,403 INFO L203 MainTranslator]: Completed pre-run [2022-11-19 08:05:42,415 WARN L234 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_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/sv-benchmarks/c/loops-crafted-1/watermelon.c[373,386] [2022-11-19 08:05:42,421 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-19 08:05:42,433 INFO L208 MainTranslator]: Completed translation [2022-11-19 08:05:42,433 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:05:42 WrapperNode [2022-11-19 08:05:42,433 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-19 08:05:42,435 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-19 08:05:42,435 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-19 08:05:42,435 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-19 08:05:42,443 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:05:42" (1/1) ... [2022-11-19 08:05:42,450 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:05:42" (1/1) ... [2022-11-19 08:05:42,478 INFO L138 Inliner]: procedures = 15, calls = 10, calls flagged for inlining = 5, calls inlined = 5, statements flattened = 64 [2022-11-19 08:05:42,479 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-19 08:05:42,480 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-19 08:05:42,481 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-19 08:05:42,481 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-19 08:05:42,490 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:05:42" (1/1) ... [2022-11-19 08:05:42,491 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:05:42" (1/1) ... [2022-11-19 08:05:42,505 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:05:42" (1/1) ... [2022-11-19 08:05:42,507 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:05:42" (1/1) ... [2022-11-19 08:05:42,510 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:05:42" (1/1) ... [2022-11-19 08:05:42,521 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:05:42" (1/1) ... [2022-11-19 08:05:42,522 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:05:42" (1/1) ... [2022-11-19 08:05:42,523 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:05:42" (1/1) ... [2022-11-19 08:05:42,527 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-19 08:05:42,535 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-19 08:05:42,535 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-19 08:05:42,536 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-19 08:05:42,537 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:05:42" (1/1) ... [2022-11-19 08:05:42,543 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-19 08:05:42,555 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:05:42,571 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-19 08:05:42,595 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-19 08:05:42,626 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-19 08:05:42,626 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-19 08:05:42,626 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-19 08:05:42,627 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-19 08:05:42,694 INFO L235 CfgBuilder]: Building ICFG [2022-11-19 08:05:42,696 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-19 08:05:42,926 INFO L276 CfgBuilder]: Performing block encoding [2022-11-19 08:05:42,980 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-19 08:05:42,985 INFO L300 CfgBuilder]: Removed 2 assume(true) statements. [2022-11-19 08:05:42,988 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 08:05:42 BoogieIcfgContainer [2022-11-19 08:05:42,989 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-19 08:05:42,991 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-19 08:05:42,992 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-19 08:05:42,995 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-19 08:05:42,995 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 08:05:42" (1/3) ... [2022-11-19 08:05:42,996 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3666f2a8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 08:05:42, skipping insertion in model container [2022-11-19 08:05:42,997 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:05:42" (2/3) ... [2022-11-19 08:05:42,997 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3666f2a8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 08:05:42, skipping insertion in model container [2022-11-19 08:05:42,997 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 08:05:42" (3/3) ... [2022-11-19 08:05:42,999 INFO L112 eAbstractionObserver]: Analyzing ICFG watermelon.c [2022-11-19 08:05:43,017 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-19 08:05:43,017 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-19 08:05:43,090 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-19 08:05:43,099 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;@3d592349, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-19 08:05:43,099 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-19 08:05:43,108 INFO L276 IsEmpty]: Start isEmpty. Operand has 14 states, 12 states have (on average 1.5833333333333333) internal successors, (19), 13 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:05:43,114 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-11-19 08:05:43,114 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:05:43,116 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:05:43,116 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:05:43,123 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:05:43,124 INFO L85 PathProgramCache]: Analyzing trace with hash -1927148626, now seen corresponding path program 1 times [2022-11-19 08:05:43,135 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:05:43,136 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1613547024] [2022-11-19 08:05:43,136 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:05:43,137 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:05:43,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:05:43,655 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:05:43,655 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:05:43,656 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1613547024] [2022-11-19 08:05:43,656 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1613547024] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 08:05:43,657 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 08:05:43,657 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-11-19 08:05:43,659 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1331852568] [2022-11-19 08:05:43,659 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 08:05:43,664 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-19 08:05:43,664 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:05:43,727 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-19 08:05:43,727 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-19 08:05:43,729 INFO L87 Difference]: Start difference. First operand has 14 states, 12 states have (on average 1.5833333333333333) internal successors, (19), 13 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 6 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:05:43,896 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:05:43,896 INFO L93 Difference]: Finished difference Result 36 states and 41 transitions. [2022-11-19 08:05:43,898 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-19 08:05:43,899 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 6 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2022-11-19 08:05:43,900 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:05:43,908 INFO L225 Difference]: With dead ends: 36 [2022-11-19 08:05:43,908 INFO L226 Difference]: Without dead ends: 18 [2022-11-19 08:05:43,911 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=34, Invalid=56, Unknown=0, NotChecked=0, Total=90 [2022-11-19 08:05:43,915 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 40 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 53 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 53 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 08:05:43,916 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [40 Valid, 38 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 53 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 08:05:43,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2022-11-19 08:05:43,948 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 13. [2022-11-19 08:05:43,949 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 12 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:05:43,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 16 transitions. [2022-11-19 08:05:43,952 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 16 transitions. Word has length 8 [2022-11-19 08:05:43,952 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:05:43,952 INFO L495 AbstractCegarLoop]: Abstraction has 13 states and 16 transitions. [2022-11-19 08:05:43,953 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 6 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:05:43,953 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 16 transitions. [2022-11-19 08:05:43,954 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-19 08:05:43,954 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:05:43,955 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:05:43,955 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-19 08:05:43,956 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:05:43,956 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:05:43,957 INFO L85 PathProgramCache]: Analyzing trace with hash 390039330, now seen corresponding path program 1 times [2022-11-19 08:05:43,957 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:05:43,957 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1135542006] [2022-11-19 08:05:43,957 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:05:43,958 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:05:43,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:05:44,091 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:05:44,092 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:05:44,093 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1135542006] [2022-11-19 08:05:44,094 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1135542006] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 08:05:44,094 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 08:05:44,094 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-19 08:05:44,095 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [765924235] [2022-11-19 08:05:44,095 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 08:05:44,097 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-19 08:05:44,097 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:05:44,099 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-19 08:05:44,100 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-19 08:05:44,100 INFO L87 Difference]: Start difference. First operand 13 states and 16 transitions. Second operand has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:05:44,130 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:05:44,130 INFO L93 Difference]: Finished difference Result 18 states and 21 transitions. [2022-11-19 08:05:44,130 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-19 08:05:44,131 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2022-11-19 08:05:44,131 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:05:44,132 INFO L225 Difference]: With dead ends: 18 [2022-11-19 08:05:44,133 INFO L226 Difference]: Without dead ends: 14 [2022-11-19 08:05:44,137 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-19 08:05:44,140 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 [2022-11-19 08:05:44,141 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 12 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-19 08:05:44,145 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2022-11-19 08:05:44,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2022-11-19 08:05:44,152 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.3076923076923077) internal successors, (17), 13 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:05:44,153 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 17 transitions. [2022-11-19 08:05:44,157 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 17 transitions. Word has length 9 [2022-11-19 08:05:44,157 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:05:44,159 INFO L495 AbstractCegarLoop]: Abstraction has 14 states and 17 transitions. [2022-11-19 08:05:44,159 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:05:44,160 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 17 transitions. [2022-11-19 08:05:44,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-19 08:05:44,167 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:05:44,167 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:05:44,167 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-19 08:05:44,168 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:05:44,168 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:05:44,168 INFO L85 PathProgramCache]: Analyzing trace with hash -1862814498, now seen corresponding path program 1 times [2022-11-19 08:05:44,169 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:05:44,169 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [593819612] [2022-11-19 08:05:44,169 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:05:44,169 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:05:44,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:05:44,260 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:05:44,261 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:05:44,261 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [593819612] [2022-11-19 08:05:44,261 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [593819612] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 08:05:44,262 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 08:05:44,262 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-19 08:05:44,263 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1001821439] [2022-11-19 08:05:44,264 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 08:05:44,265 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-19 08:05:44,265 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:05:44,266 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-19 08:05:44,266 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-19 08:05:44,266 INFO L87 Difference]: Start difference. First operand 14 states and 17 transitions. Second operand has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:05:44,310 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:05:44,310 INFO L93 Difference]: Finished difference Result 23 states and 28 transitions. [2022-11-19 08:05:44,311 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-19 08:05:44,311 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2022-11-19 08:05:44,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:05:44,313 INFO L225 Difference]: With dead ends: 23 [2022-11-19 08:05:44,313 INFO L226 Difference]: Without dead ends: 15 [2022-11-19 08:05:44,316 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-19 08:05:44,321 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 [2022-11-19 08:05:44,322 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 11 Invalid, 16 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-19 08:05:44,325 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2022-11-19 08:05:44,328 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2022-11-19 08:05:44,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.2857142857142858) internal successors, (18), 14 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:05:44,329 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 18 transitions. [2022-11-19 08:05:44,329 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 18 transitions. Word has length 9 [2022-11-19 08:05:44,329 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:05:44,329 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 18 transitions. [2022-11-19 08:05:44,330 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:05:44,330 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 18 transitions. [2022-11-19 08:05:44,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-11-19 08:05:44,330 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:05:44,331 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:05:44,331 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-11-19 08:05:44,331 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:05:44,332 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:05:44,332 INFO L85 PathProgramCache]: Analyzing trace with hash -803583839, now seen corresponding path program 1 times [2022-11-19 08:05:44,332 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:05:44,332 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1389683798] [2022-11-19 08:05:44,332 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:05:44,333 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:05:44,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:05:44,458 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:05:44,458 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:05:44,458 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1389683798] [2022-11-19 08:05:44,459 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1389683798] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:05:44,459 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [795948662] [2022-11-19 08:05:44,459 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:05:44,459 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:05:44,459 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:05:44,467 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:05:44,471 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-19 08:05:44,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:05:44,533 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 6 conjunts are in the unsatisfiable core [2022-11-19 08:05:44,538 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:05:44,933 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 08:05:44,933 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-19 08:05:44,933 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [795948662] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 08:05:44,934 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-19 08:05:44,934 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [4] total 7 [2022-11-19 08:05:44,934 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [195842305] [2022-11-19 08:05:44,934 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 08:05:44,935 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-19 08:05:44,935 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:05:44,935 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-19 08:05:44,936 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-11-19 08:05:44,936 INFO L87 Difference]: Start difference. First operand 15 states and 18 transitions. Second operand has 5 states, 5 states have (on average 2.0) internal successors, (10), 5 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:05:45,066 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:05:45,067 INFO L93 Difference]: Finished difference Result 25 states and 27 transitions. [2022-11-19 08:05:45,067 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-19 08:05:45,067 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 5 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2022-11-19 08:05:45,067 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:05:45,068 INFO L225 Difference]: With dead ends: 25 [2022-11-19 08:05:45,068 INFO L226 Difference]: Without dead ends: 17 [2022-11-19 08:05:45,068 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2022-11-19 08:05:45,069 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 [2022-11-19 08:05:45,070 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 12 Invalid, 30 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-19 08:05:45,070 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2022-11-19 08:05:45,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 13. [2022-11-19 08:05:45,074 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.25) internal successors, (15), 12 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:05:45,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 15 transitions. [2022-11-19 08:05:45,074 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 15 transitions. Word has length 10 [2022-11-19 08:05:45,075 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:05:45,075 INFO L495 AbstractCegarLoop]: Abstraction has 13 states and 15 transitions. [2022-11-19 08:05:45,075 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 5 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:05:45,075 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 15 transitions. [2022-11-19 08:05:45,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-11-19 08:05:45,076 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:05:45,076 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:05:45,087 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-19 08:05:45,281 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:05:45,282 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:05:45,283 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:05:45,283 INFO L85 PathProgramCache]: Analyzing trace with hash -1928566110, now seen corresponding path program 1 times [2022-11-19 08:05:45,283 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:05:45,283 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1739271363] [2022-11-19 08:05:45,283 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:05:45,284 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:05:45,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:05:45,359 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:05:45,359 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:05:45,359 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1739271363] [2022-11-19 08:05:45,359 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1739271363] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:05:45,360 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1642180042] [2022-11-19 08:05:45,360 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:05:45,360 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:05:45,360 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:05:45,362 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:05:45,387 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-19 08:05:45,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:05:45,442 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-19 08:05:45,445 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:05:45,495 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:05:45,496 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:05:45,530 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:05:45,530 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1642180042] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:05:45,531 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [829737428] [2022-11-19 08:05:45,562 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-19 08:05:45,568 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:05:45,573 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:05:45,587 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:05:45,588 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:05:45,886 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:05:47,078 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '366#(and (< |ULTIMATE.start_student_version_~w#1| 4) (= |ULTIMATE.start_correct_version_~i~0#1| |ULTIMATE.start_correct_version_~w#1|) (<= 4 |ULTIMATE.start_correct_version_~w#1|) (= ~true~0 1) (<= |ULTIMATE.start_correct_version_~is_divisible~0#1| 1) (= |ULTIMATE.start_correct_version_#res#1| |ULTIMATE.start_main_~is_divisible1~0#1|) (<= 4 |ULTIMATE.start_correct_version_#in~w#1|) (= ~false~0 0) (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_#in~w#1|) (= |ULTIMATE.start_student_version_#in~w#1| (ite (<= (mod |ULTIMATE.start_main_~w~0#1| 4294967296) 2147483647) (mod |ULTIMATE.start_main_~w~0#1| 4294967296) (+ (mod |ULTIMATE.start_main_~w~0#1| 4294967296) (- 4294967296)))) (= |ULTIMATE.start_correct_version_#res#1| |ULTIMATE.start_correct_version_~is_divisible~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start_student_version_~is_divisible~1#1| ~false~0) (= |ULTIMATE.start_student_version_~is_divisible~1#1| |ULTIMATE.start_student_version_#res#1|) (<= 0 |#StackHeapBarrier|) (<= 1 |ULTIMATE.start_correct_version_~is_divisible~0#1|) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (= |#NULL.base| 0))' at error location [2022-11-19 08:05:47,079 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:05:47,079 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:05:47,079 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 8 [2022-11-19 08:05:47,080 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [705903048] [2022-11-19 08:05:47,080 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:05:47,080 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-19 08:05:47,080 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:05:47,081 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-19 08:05:47,081 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=195, Unknown=0, NotChecked=0, Total=240 [2022-11-19 08:05:47,082 INFO L87 Difference]: Start difference. First operand 13 states and 15 transitions. Second operand has 8 states, 8 states have (on average 2.0) internal successors, (16), 8 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:05:47,149 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:05:47,149 INFO L93 Difference]: Finished difference Result 22 states and 26 transitions. [2022-11-19 08:05:47,151 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-19 08:05:47,151 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.0) internal successors, (16), 8 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2022-11-19 08:05:47,152 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:05:47,152 INFO L225 Difference]: With dead ends: 22 [2022-11-19 08:05:47,152 INFO L226 Difference]: Without dead ends: 14 [2022-11-19 08:05:47,153 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 75 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=45, Invalid=195, Unknown=0, NotChecked=0, Total=240 [2022-11-19 08:05:47,154 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 0 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 08:05:47,154 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 26 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 08:05:47,155 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2022-11-19 08:05:47,158 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2022-11-19 08:05:47,158 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 13 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:05:47,159 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2022-11-19 08:05:47,159 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 10 [2022-11-19 08:05:47,159 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:05:47,160 INFO L495 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2022-11-19 08:05:47,160 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.0) internal successors, (16), 8 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:05:47,160 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2022-11-19 08:05:47,160 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-11-19 08:05:47,161 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:05:47,161 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:05:47,173 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-19 08:05:47,367 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:05:47,368 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:05:47,368 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:05:47,368 INFO L85 PathProgramCache]: Analyzing trace with hash 328101214, now seen corresponding path program 2 times [2022-11-19 08:05:47,369 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:05:47,369 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1073780046] [2022-11-19 08:05:47,369 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:05:47,369 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:05:47,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:05:47,605 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-19 08:05:47,606 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:05:47,606 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1073780046] [2022-11-19 08:05:47,606 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1073780046] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 08:05:47,606 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 08:05:47,606 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-11-19 08:05:47,607 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [424461430] [2022-11-19 08:05:47,607 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 08:05:47,607 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-19 08:05:47,607 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:05:47,608 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-19 08:05:47,608 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-11-19 08:05:47,608 INFO L87 Difference]: Start difference. First operand 14 states and 16 transitions. Second operand has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 6 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:05:47,666 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:05:47,666 INFO L93 Difference]: Finished difference Result 18 states and 19 transitions. [2022-11-19 08:05:47,666 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-19 08:05:47,667 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 6 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2022-11-19 08:05:47,667 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:05:47,669 INFO L225 Difference]: With dead ends: 18 [2022-11-19 08:05:47,669 INFO L226 Difference]: Without dead ends: 14 [2022-11-19 08:05:47,672 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2022-11-19 08:05:47,676 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 24 mSDsluCounter, 1 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 4 SdHoareTripleChecker+Invalid, 17 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-19 08:05:47,676 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [24 Valid, 4 Invalid, 17 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-19 08:05:47,677 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2022-11-19 08:05:47,692 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2022-11-19 08:05:47,692 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 13 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:05:47,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2022-11-19 08:05:47,696 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 11 [2022-11-19 08:05:47,696 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:05:47,696 INFO L495 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2022-11-19 08:05:47,696 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 6 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:05:47,697 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2022-11-19 08:05:47,698 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-19 08:05:47,698 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:05:47,699 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:05:47,699 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2022-11-19 08:05:47,699 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:05:47,700 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:05:47,700 INFO L85 PathProgramCache]: Analyzing trace with hash 1827995217, now seen corresponding path program 1 times [2022-11-19 08:05:47,700 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:05:47,700 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [554444366] [2022-11-19 08:05:47,700 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:05:47,700 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:05:47,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:05:47,794 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-19 08:05:47,794 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:05:47,795 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [554444366] [2022-11-19 08:05:47,795 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [554444366] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:05:47,795 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [731894613] [2022-11-19 08:05:47,795 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:05:47,795 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:05:47,795 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:05:47,797 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:05:47,811 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-19 08:05:47,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:05:47,867 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-19 08:05:47,868 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:05:47,900 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-19 08:05:47,901 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:05:47,924 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-19 08:05:47,924 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [731894613] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:05:47,925 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1673459574] [2022-11-19 08:05:47,927 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-19 08:05:47,927 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:05:47,928 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:05:47,928 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:05:47,928 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:05:48,198 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:05:49,321 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '563#(and (<= 4 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_correct_version_#res#1| 1) (<= 4 |ULTIMATE.start_student_version_~w#1|) (<= |ULTIMATE.start_main_~is_divisible1~0#1| 1) (<= 4 |ULTIMATE.start_correct_version_~w#1|) (<= 4 |ULTIMATE.start_student_version_#in~w#1|) (<= 0 |ULTIMATE.start_correct_version_~is_divisible~0#1|) (= ~true~0 1) (<= |ULTIMATE.start_correct_version_~is_divisible~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 4 |ULTIMATE.start_correct_version_#in~w#1|) (not (< |ULTIMATE.start_student_version_~i~1#1| |ULTIMATE.start_student_version_~w#1|)) (= ~false~0 0) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (or (and (not (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start_student_version_~is_divisible~1#1| ~false~0)) (and (<= 1 |ULTIMATE.start_student_version_~is_divisible~1#1|) (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|) (<= |ULTIMATE.start_student_version_~is_divisible~1#1| 1))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~is_divisible1~0#1|) (= |ULTIMATE.start_student_version_~is_divisible~1#1| |ULTIMATE.start_student_version_#res#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (= |#NULL.base| 0))' at error location [2022-11-19 08:05:49,322 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:05:49,322 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:05:49,322 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 8 [2022-11-19 08:05:49,322 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [316428396] [2022-11-19 08:05:49,322 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:05:49,322 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-19 08:05:49,323 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:05:49,323 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-19 08:05:49,323 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=225, Unknown=0, NotChecked=0, Total=272 [2022-11-19 08:05:49,324 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand has 8 states, 8 states have (on average 2.25) internal successors, (18), 8 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:05:49,350 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:05:49,351 INFO L93 Difference]: Finished difference Result 19 states and 20 transitions. [2022-11-19 08:05:49,351 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-19 08:05:49,351 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.25) internal successors, (18), 8 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2022-11-19 08:05:49,351 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:05:49,352 INFO L225 Difference]: With dead ends: 19 [2022-11-19 08:05:49,352 INFO L226 Difference]: Without dead ends: 15 [2022-11-19 08:05:49,352 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 84 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=47, Invalid=225, Unknown=0, NotChecked=0, Total=272 [2022-11-19 08:05:49,353 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 0 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 20 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-19 08:05:49,353 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 9 Invalid, 20 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-19 08:05:49,354 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2022-11-19 08:05:49,360 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2022-11-19 08:05:49,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 14 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:05:49,361 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2022-11-19 08:05:49,361 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 13 [2022-11-19 08:05:49,361 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:05:49,361 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2022-11-19 08:05:49,362 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.25) internal successors, (18), 8 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:05:49,362 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2022-11-19 08:05:49,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-11-19 08:05:49,362 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:05:49,362 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:05:49,371 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2022-11-19 08:05:49,563 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2022-11-19 08:05:49,563 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:05:49,564 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:05:49,564 INFO L85 PathProgramCache]: Analyzing trace with hash 823375698, now seen corresponding path program 2 times [2022-11-19 08:05:49,564 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:05:49,564 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [645377314] [2022-11-19 08:05:49,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:05:49,564 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:05:49,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:05:49,807 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:05:49,807 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:05:49,807 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [645377314] [2022-11-19 08:05:49,807 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [645377314] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:05:49,808 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [448194597] [2022-11-19 08:05:49,808 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 08:05:49,808 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:05:49,808 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:05:49,809 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:05:49,816 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-19 08:05:49,874 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-19 08:05:49,874 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:05:49,876 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 30 conjunts are in the unsatisfiable core [2022-11-19 08:05:49,878 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:05:50,072 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:05:50,072 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:05:50,422 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:05:50,422 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [448194597] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:05:50,423 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2007197518] [2022-11-19 08:05:50,427 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-19 08:05:50,428 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:05:50,428 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:05:50,428 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:05:50,429 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:05:50,683 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:05:51,809 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '725#(and (<= 4 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_correct_version_#res#1| 1) (<= 4 |ULTIMATE.start_student_version_~w#1|) (<= |ULTIMATE.start_main_~is_divisible1~0#1| 1) (<= 4 |ULTIMATE.start_correct_version_~w#1|) (<= 4 |ULTIMATE.start_student_version_#in~w#1|) (<= 0 |ULTIMATE.start_correct_version_~is_divisible~0#1|) (= ~true~0 1) (<= |ULTIMATE.start_correct_version_~is_divisible~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 4 |ULTIMATE.start_correct_version_#in~w#1|) (not (< |ULTIMATE.start_student_version_~i~1#1| |ULTIMATE.start_student_version_~w#1|)) (= ~false~0 0) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (or (and (not (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start_student_version_~is_divisible~1#1| ~false~0)) (and (<= 1 |ULTIMATE.start_student_version_~is_divisible~1#1|) (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|) (<= |ULTIMATE.start_student_version_~is_divisible~1#1| 1))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~is_divisible1~0#1|) (= |ULTIMATE.start_student_version_~is_divisible~1#1| |ULTIMATE.start_student_version_#res#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (= |#NULL.base| 0))' at error location [2022-11-19 08:05:51,810 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:05:51,810 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:05:51,810 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 24 [2022-11-19 08:05:51,810 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [335055066] [2022-11-19 08:05:51,811 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:05:51,811 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-11-19 08:05:51,811 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:05:51,812 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-11-19 08:05:51,812 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=918, Unknown=0, NotChecked=0, Total=1056 [2022-11-19 08:05:51,812 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand has 24 states, 24 states have (on average 1.3333333333333333) internal successors, (32), 24 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:05:52,129 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:05:52,129 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2022-11-19 08:05:52,133 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-19 08:05:52,133 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.3333333333333333) internal successors, (32), 24 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2022-11-19 08:05:52,133 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:05:52,134 INFO L225 Difference]: With dead ends: 30 [2022-11-19 08:05:52,134 INFO L226 Difference]: Without dead ends: 26 [2022-11-19 08:05:52,135 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 599 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=204, Invalid=1202, Unknown=0, NotChecked=0, Total=1406 [2022-11-19 08:05:52,135 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 22 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 113 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 47 SdHoareTripleChecker+Invalid, 125 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 113 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 08:05:52,136 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [22 Valid, 47 Invalid, 125 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 113 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 08:05:52,136 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2022-11-19 08:05:52,149 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 19. [2022-11-19 08:05:52,149 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 18 states have (on average 1.1666666666666667) internal successors, (21), 18 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:05:52,149 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2022-11-19 08:05:52,150 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 14 [2022-11-19 08:05:52,150 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:05:52,150 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2022-11-19 08:05:52,150 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 1.3333333333333333) internal successors, (32), 24 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:05:52,150 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2022-11-19 08:05:52,151 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-11-19 08:05:52,152 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:05:52,152 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:05:52,163 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-19 08:05:52,358 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:05:52,358 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:05:52,358 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:05:52,359 INFO L85 PathProgramCache]: Analyzing trace with hash -255058319, now seen corresponding path program 3 times [2022-11-19 08:05:52,359 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:05:52,359 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [186933960] [2022-11-19 08:05:52,359 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:05:52,359 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:05:52,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:05:52,685 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:05:52,685 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:05:52,685 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [186933960] [2022-11-19 08:05:52,685 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [186933960] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:05:52,685 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [423261385] [2022-11-19 08:05:52,686 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 08:05:52,686 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:05:52,686 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:05:52,688 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:05:52,711 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-19 08:05:52,751 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 08:05:52,751 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:05:52,752 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-19 08:05:52,754 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:05:53,161 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:05:53,161 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:05:53,485 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:05:53,485 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [423261385] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:05:53,485 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1964213588] [2022-11-19 08:05:53,487 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-19 08:05:53,488 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:05:53,488 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:05:53,488 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:05:53,489 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:05:53,700 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:05:54,951 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '927#(and (<= 4 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_correct_version_#res#1| 1) (<= 4 |ULTIMATE.start_student_version_~w#1|) (<= |ULTIMATE.start_main_~is_divisible1~0#1| 1) (<= 4 |ULTIMATE.start_correct_version_~w#1|) (<= 4 |ULTIMATE.start_student_version_#in~w#1|) (<= 0 |ULTIMATE.start_correct_version_~is_divisible~0#1|) (= ~true~0 1) (<= |ULTIMATE.start_correct_version_~is_divisible~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 4 |ULTIMATE.start_correct_version_#in~w#1|) (not (< |ULTIMATE.start_student_version_~i~1#1| |ULTIMATE.start_student_version_~w#1|)) (= ~false~0 0) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (or (and (not (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start_student_version_~is_divisible~1#1| ~false~0)) (and (<= 1 |ULTIMATE.start_student_version_~is_divisible~1#1|) (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|) (<= |ULTIMATE.start_student_version_~is_divisible~1#1| 1))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~is_divisible1~0#1|) (= |ULTIMATE.start_student_version_~is_divisible~1#1| |ULTIMATE.start_student_version_#res#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (= |#NULL.base| 0))' at error location [2022-11-19 08:05:54,952 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:05:54,952 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:05:54,952 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 23 [2022-11-19 08:05:54,952 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1180015476] [2022-11-19 08:05:54,952 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:05:54,953 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-11-19 08:05:54,953 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:05:54,953 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-11-19 08:05:54,954 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=850, Unknown=0, NotChecked=0, Total=992 [2022-11-19 08:05:54,954 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand has 23 states, 23 states have (on average 1.3478260869565217) internal successors, (31), 23 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:05:55,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:05:55,425 INFO L93 Difference]: Finished difference Result 26 states and 28 transitions. [2022-11-19 08:05:55,425 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-19 08:05:55,426 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.3478260869565217) internal successors, (31), 23 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2022-11-19 08:05:55,426 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:05:55,426 INFO L225 Difference]: With dead ends: 26 [2022-11-19 08:05:55,426 INFO L226 Difference]: Without dead ends: 16 [2022-11-19 08:05:55,427 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 19 SyntacticMatches, 5 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 522 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=231, Invalid=1175, Unknown=0, NotChecked=0, Total=1406 [2022-11-19 08:05:55,428 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 46 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 63 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 73 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 63 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 08:05:55,428 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [46 Valid, 12 Invalid, 73 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 63 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 08:05:55,429 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2022-11-19 08:05:55,439 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2022-11-19 08:05:55,440 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 15 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:05:55,440 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2022-11-19 08:05:55,440 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 15 [2022-11-19 08:05:55,441 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:05:55,441 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2022-11-19 08:05:55,444 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.3478260869565217) internal successors, (31), 23 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:05:55,444 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2022-11-19 08:05:55,445 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-11-19 08:05:55,445 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:05:55,445 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:05:55,457 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-19 08:05:55,651 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:05:55,651 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:05:55,652 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:05:55,652 INFO L85 PathProgramCache]: Analyzing trace with hash -853672946, now seen corresponding path program 4 times [2022-11-19 08:05:55,652 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:05:55,652 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [738630338] [2022-11-19 08:05:55,652 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:05:55,653 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:05:55,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:05:56,069 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:05:56,070 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:05:56,070 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [738630338] [2022-11-19 08:05:56,070 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [738630338] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:05:56,070 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [168744594] [2022-11-19 08:05:56,070 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 08:05:56,070 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:05:56,070 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:05:56,072 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:05:56,102 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-19 08:05:56,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:05:56,135 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-19 08:05:56,137 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:05:56,474 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:05:56,475 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:05:56,765 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:05:56,765 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [168744594] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:05:56,766 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [841312709] [2022-11-19 08:05:56,769 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-19 08:05:56,770 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:05:56,770 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:05:56,770 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:05:56,770 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:05:56,994 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:05:58,181 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1122#(and (<= 4 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_correct_version_#res#1| 1) (<= 4 |ULTIMATE.start_student_version_~w#1|) (<= |ULTIMATE.start_main_~is_divisible1~0#1| 1) (<= 4 |ULTIMATE.start_correct_version_~w#1|) (<= 4 |ULTIMATE.start_student_version_#in~w#1|) (<= 0 |ULTIMATE.start_correct_version_~is_divisible~0#1|) (= ~true~0 1) (<= |ULTIMATE.start_correct_version_~is_divisible~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 4 |ULTIMATE.start_correct_version_#in~w#1|) (not (< |ULTIMATE.start_student_version_~i~1#1| |ULTIMATE.start_student_version_~w#1|)) (= ~false~0 0) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (or (and (not (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start_student_version_~is_divisible~1#1| ~false~0)) (and (<= 1 |ULTIMATE.start_student_version_~is_divisible~1#1|) (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|) (<= |ULTIMATE.start_student_version_~is_divisible~1#1| 1))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~is_divisible1~0#1|) (= |ULTIMATE.start_student_version_~is_divisible~1#1| |ULTIMATE.start_student_version_#res#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (= |#NULL.base| 0))' at error location [2022-11-19 08:05:58,181 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:05:58,182 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:05:58,182 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11, 11] total 24 [2022-11-19 08:05:58,182 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [575239831] [2022-11-19 08:05:58,182 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:05:58,182 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-11-19 08:05:58,183 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:05:58,183 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-11-19 08:05:58,184 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=150, Invalid=906, Unknown=0, NotChecked=0, Total=1056 [2022-11-19 08:05:58,184 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand has 24 states, 24 states have (on average 1.3333333333333333) internal successors, (32), 24 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:05:58,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:05:58,574 INFO L93 Difference]: Finished difference Result 21 states and 22 transitions. [2022-11-19 08:05:58,574 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-19 08:05:58,574 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.3333333333333333) internal successors, (32), 24 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2022-11-19 08:05:58,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:05:58,575 INFO L225 Difference]: With dead ends: 21 [2022-11-19 08:05:58,575 INFO L226 Difference]: Without dead ends: 17 [2022-11-19 08:05:58,576 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 19 SyntacticMatches, 5 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 562 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=252, Invalid=1154, Unknown=0, NotChecked=0, Total=1406 [2022-11-19 08:05:58,577 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 64 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 73 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 64 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 79 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 73 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 08:05:58,579 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [64 Valid, 12 Invalid, 79 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 73 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 08:05:58,580 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2022-11-19 08:05:58,587 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2022-11-19 08:05:58,588 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 16 states have (on average 1.125) internal successors, (18), 16 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:05:58,588 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2022-11-19 08:05:58,588 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 15 [2022-11-19 08:05:58,589 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:05:58,589 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2022-11-19 08:05:58,589 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 1.3333333333333333) internal successors, (32), 24 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:05:58,589 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2022-11-19 08:05:58,590 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-11-19 08:05:58,590 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:05:58,590 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:05:58,596 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-19 08:05:58,793 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-11-19 08:05:58,794 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:05:58,794 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:05:58,795 INFO L85 PathProgramCache]: Analyzing trace with hash -703958731, now seen corresponding path program 5 times [2022-11-19 08:05:58,795 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:05:58,795 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [15391384] [2022-11-19 08:05:58,795 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:05:58,795 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:05:58,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:05:59,638 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:05:59,639 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:05:59,639 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [15391384] [2022-11-19 08:05:59,639 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [15391384] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:05:59,639 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [716107846] [2022-11-19 08:05:59,639 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 08:05:59,640 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:05:59,640 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:05:59,643 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:05:59,653 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-19 08:05:59,711 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-19 08:05:59,711 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:05:59,713 WARN L261 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 48 conjunts are in the unsatisfiable core [2022-11-19 08:05:59,715 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:06:01,586 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:06:01,586 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:06:02,524 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:06:02,525 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [716107846] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:06:02,525 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [311995238] [2022-11-19 08:06:02,532 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-19 08:06:02,533 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:06:02,533 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:06:02,534 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:06:02,534 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:06:02,747 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:06:04,375 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1330#(and (<= 4 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_correct_version_#res#1| 1) (<= 4 |ULTIMATE.start_student_version_~w#1|) (<= |ULTIMATE.start_main_~is_divisible1~0#1| 1) (<= 4 |ULTIMATE.start_correct_version_~w#1|) (<= 4 |ULTIMATE.start_student_version_#in~w#1|) (<= 0 |ULTIMATE.start_correct_version_~is_divisible~0#1|) (= ~true~0 1) (<= |ULTIMATE.start_correct_version_~is_divisible~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 4 |ULTIMATE.start_correct_version_#in~w#1|) (not (< |ULTIMATE.start_student_version_~i~1#1| |ULTIMATE.start_student_version_~w#1|)) (= ~false~0 0) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (or (and (not (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start_student_version_~is_divisible~1#1| ~false~0)) (and (<= 1 |ULTIMATE.start_student_version_~is_divisible~1#1|) (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|) (<= |ULTIMATE.start_student_version_~is_divisible~1#1| 1))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~is_divisible1~0#1|) (= |ULTIMATE.start_student_version_~is_divisible~1#1| |ULTIMATE.start_student_version_#res#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (= |#NULL.base| 0))' at error location [2022-11-19 08:06:04,375 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:06:04,375 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:06:04,375 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 40 [2022-11-19 08:06:04,376 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1469333259] [2022-11-19 08:06:04,376 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:06:04,376 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-11-19 08:06:04,376 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:06:04,377 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-11-19 08:06:04,378 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=2186, Unknown=0, NotChecked=0, Total=2352 [2022-11-19 08:06:04,379 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand has 40 states, 40 states have (on average 1.075) internal successors, (43), 40 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) [2022-11-19 08:06:06,994 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:06:06,995 INFO L93 Difference]: Finished difference Result 31 states and 34 transitions. [2022-11-19 08:06:06,996 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-11-19 08:06:06,996 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.075) internal successors, (43), 40 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) Word has length 16 [2022-11-19 08:06:06,996 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:06:06,997 INFO L225 Difference]: With dead ends: 31 [2022-11-19 08:06:06,997 INFO L226 Difference]: Without dead ends: 18 [2022-11-19 08:06:06,998 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 786 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=290, Invalid=3016, Unknown=0, NotChecked=0, Total=3306 [2022-11-19 08:06:06,999 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 83 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 404 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 83 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 412 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 404 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-19 08:06:07,000 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [83 Valid, 52 Invalid, 412 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 404 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-19 08:06:07,000 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2022-11-19 08:06:07,009 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2022-11-19 08:06:07,009 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) [2022-11-19 08:06:07,010 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2022-11-19 08:06:07,010 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 16 [2022-11-19 08:06:07,010 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:06:07,011 INFO L495 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2022-11-19 08:06:07,011 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 1.075) internal successors, (43), 40 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) [2022-11-19 08:06:07,011 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2022-11-19 08:06:07,011 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-11-19 08:06:07,012 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:06:07,012 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:06:07,027 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-19 08:06:07,219 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-11-19 08:06:07,219 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:06:07,220 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:06:07,220 INFO L85 PathProgramCache]: Analyzing trace with hash -1734969615, now seen corresponding path program 6 times [2022-11-19 08:06:07,220 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:06:07,220 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1203394159] [2022-11-19 08:06:07,220 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:06:07,220 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:06:07,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:06:07,667 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:06:07,668 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:06:07,668 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1203394159] [2022-11-19 08:06:07,668 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1203394159] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:06:07,668 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [724267991] [2022-11-19 08:06:07,669 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 08:06:07,669 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:06:07,669 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:06:07,670 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:06:07,680 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-19 08:06:07,730 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 08:06:07,730 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:06:07,731 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 14 conjunts are in the unsatisfiable core [2022-11-19 08:06:07,733 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:06:08,147 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:06:08,147 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:06:08,518 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:06:08,518 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [724267991] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:06:08,518 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [505039680] [2022-11-19 08:06:08,521 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-19 08:06:08,521 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:06:08,522 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:06:08,522 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:06:08,522 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:06:08,741 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:06:09,920 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1561#(and (<= 4 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_correct_version_#res#1| 1) (<= 4 |ULTIMATE.start_student_version_~w#1|) (<= |ULTIMATE.start_main_~is_divisible1~0#1| 1) (<= 4 |ULTIMATE.start_correct_version_~w#1|) (<= 4 |ULTIMATE.start_student_version_#in~w#1|) (<= 0 |ULTIMATE.start_correct_version_~is_divisible~0#1|) (= ~true~0 1) (<= |ULTIMATE.start_correct_version_~is_divisible~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 4 |ULTIMATE.start_correct_version_#in~w#1|) (not (< |ULTIMATE.start_student_version_~i~1#1| |ULTIMATE.start_student_version_~w#1|)) (= ~false~0 0) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (or (and (not (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start_student_version_~is_divisible~1#1| ~false~0)) (and (<= 1 |ULTIMATE.start_student_version_~is_divisible~1#1|) (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|) (<= |ULTIMATE.start_student_version_~is_divisible~1#1| 1))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~is_divisible1~0#1|) (= |ULTIMATE.start_student_version_~is_divisible~1#1| |ULTIMATE.start_student_version_#res#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (= |#NULL.base| 0))' at error location [2022-11-19 08:06:09,921 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:06:09,921 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:06:09,921 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 13] total 29 [2022-11-19 08:06:09,921 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [760434361] [2022-11-19 08:06:09,921 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:06:09,922 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-11-19 08:06:09,922 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:06:09,923 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-11-19 08:06:09,923 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=202, Invalid=1204, Unknown=0, NotChecked=0, Total=1406 [2022-11-19 08:06:09,924 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) [2022-11-19 08:06:10,355 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:06:10,355 INFO L93 Difference]: Finished difference Result 23 states and 24 transitions. [2022-11-19 08:06:10,355 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-19 08:06:10,356 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 [2022-11-19 08:06:10,356 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:06:10,356 INFO L225 Difference]: With dead ends: 23 [2022-11-19 08:06:10,356 INFO L226 Difference]: Without dead ends: 19 [2022-11-19 08:06:10,357 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 21 SyntacticMatches, 6 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 809 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=351, Invalid=1541, Unknown=0, NotChecked=0, Total=1892 [2022-11-19 08:06:10,358 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 86 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 91 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 86 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 100 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 91 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 08:06:10,358 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [86 Valid, 17 Invalid, 100 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 91 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 08:06:10,359 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2022-11-19 08:06:10,376 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2022-11-19 08:06:10,377 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) [2022-11-19 08:06:10,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2022-11-19 08:06:10,379 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 17 [2022-11-19 08:06:10,381 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:06:10,381 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2022-11-19 08:06:10,381 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) [2022-11-19 08:06:10,382 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2022-11-19 08:06:10,382 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-11-19 08:06:10,382 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:06:10,382 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:06:10,398 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-19 08:06:10,594 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:06:10,595 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:06:10,595 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:06:10,595 INFO L85 PathProgramCache]: Analyzing trace with hash 2040615602, now seen corresponding path program 7 times [2022-11-19 08:06:10,595 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:06:10,596 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1197475985] [2022-11-19 08:06:10,596 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:06:10,596 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:06:10,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:06:11,485 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:06:11,485 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:06:11,486 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1197475985] [2022-11-19 08:06:11,486 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1197475985] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:06:11,486 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1359006790] [2022-11-19 08:06:11,486 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 08:06:11,486 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:06:11,486 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:06:11,487 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:06:11,524 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-19 08:06:11,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:06:11,554 WARN L261 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 50 conjunts are in the unsatisfiable core [2022-11-19 08:06:11,555 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:06:13,408 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:06:13,408 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:06:14,453 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:06:14,453 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1359006790] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:06:14,454 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1654525571] [2022-11-19 08:06:14,456 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-19 08:06:14,456 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:06:14,456 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:06:14,457 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:06:14,457 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:06:14,621 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:06:16,134 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1796#(and (<= 4 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_correct_version_#res#1| 1) (<= 4 |ULTIMATE.start_student_version_~w#1|) (<= |ULTIMATE.start_main_~is_divisible1~0#1| 1) (<= 4 |ULTIMATE.start_correct_version_~w#1|) (<= 4 |ULTIMATE.start_student_version_#in~w#1|) (<= 0 |ULTIMATE.start_correct_version_~is_divisible~0#1|) (= ~true~0 1) (<= |ULTIMATE.start_correct_version_~is_divisible~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 4 |ULTIMATE.start_correct_version_#in~w#1|) (not (< |ULTIMATE.start_student_version_~i~1#1| |ULTIMATE.start_student_version_~w#1|)) (= ~false~0 0) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (or (and (not (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start_student_version_~is_divisible~1#1| ~false~0)) (and (<= 1 |ULTIMATE.start_student_version_~is_divisible~1#1|) (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|) (<= |ULTIMATE.start_student_version_~is_divisible~1#1| 1))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~is_divisible1~0#1|) (= |ULTIMATE.start_student_version_~is_divisible~1#1| |ULTIMATE.start_student_version_#res#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (= |#NULL.base| 0))' at error location [2022-11-19 08:06:16,134 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:06:16,135 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:06:16,135 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 45 [2022-11-19 08:06:16,135 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [592130079] [2022-11-19 08:06:16,135 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:06:16,135 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2022-11-19 08:06:16,135 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:06:16,136 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2022-11-19 08:06:16,137 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=187, Invalid=2675, Unknown=0, NotChecked=0, Total=2862 [2022-11-19 08:06:16,137 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand has 45 states, 45 states have (on average 1.0888888888888888) internal successors, (49), 45 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:06:19,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:06:19,908 INFO L93 Difference]: Finished difference Result 34 states and 37 transitions. [2022-11-19 08:06:19,908 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-11-19 08:06:19,909 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 1.0888888888888888) internal successors, (49), 45 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2022-11-19 08:06:19,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:06:19,909 INFO L225 Difference]: With dead ends: 34 [2022-11-19 08:06:19,909 INFO L226 Difference]: Without dead ends: 20 [2022-11-19 08:06:19,911 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1010 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=377, Invalid=3913, Unknown=0, NotChecked=0, Total=4290 [2022-11-19 08:06:19,916 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 131 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 603 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 131 SdHoareTripleChecker+Valid, 54 SdHoareTripleChecker+Invalid, 632 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 603 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-19 08:06:19,917 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [131 Valid, 54 Invalid, 632 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 603 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-19 08:06:19,917 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2022-11-19 08:06:19,927 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2022-11-19 08:06:19,927 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) [2022-11-19 08:06:19,928 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2022-11-19 08:06:19,928 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 18 [2022-11-19 08:06:19,928 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:06:19,928 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2022-11-19 08:06:19,928 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 1.0888888888888888) internal successors, (49), 45 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:06:19,929 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2022-11-19 08:06:19,929 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-11-19 08:06:19,929 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:06:19,929 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:06:19,942 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-19 08:06:20,135 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-11-19 08:06:20,135 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:06:20,136 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:06:20,136 INFO L85 PathProgramCache]: Analyzing trace with hash -918365842, now seen corresponding path program 8 times [2022-11-19 08:06:20,136 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:06:20,136 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1610517183] [2022-11-19 08:06:20,136 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:06:20,136 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:06:20,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:06:20,651 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 6 proven. 19 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:06:20,651 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:06:20,651 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1610517183] [2022-11-19 08:06:20,651 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1610517183] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:06:20,652 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1828851911] [2022-11-19 08:06:20,652 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 08:06:20,652 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:06:20,652 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:06:20,653 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:06:20,655 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-19 08:06:20,706 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-19 08:06:20,707 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:06:20,708 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 16 conjunts are in the unsatisfiable core [2022-11-19 08:06:20,709 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:06:21,152 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:06:21,152 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:06:21,535 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:06:21,535 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1828851911] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:06:21,536 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [102766205] [2022-11-19 08:06:21,537 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-19 08:06:21,538 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:06:21,538 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:06:21,538 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:06:21,539 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:06:21,693 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:06:22,840 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2060#(and (<= 4 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_correct_version_#res#1| 1) (<= 4 |ULTIMATE.start_student_version_~w#1|) (<= |ULTIMATE.start_main_~is_divisible1~0#1| 1) (<= 4 |ULTIMATE.start_correct_version_~w#1|) (<= 4 |ULTIMATE.start_student_version_#in~w#1|) (<= 0 |ULTIMATE.start_correct_version_~is_divisible~0#1|) (= ~true~0 1) (<= |ULTIMATE.start_correct_version_~is_divisible~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 4 |ULTIMATE.start_correct_version_#in~w#1|) (not (< |ULTIMATE.start_student_version_~i~1#1| |ULTIMATE.start_student_version_~w#1|)) (= ~false~0 0) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (or (and (not (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start_student_version_~is_divisible~1#1| ~false~0)) (and (<= 1 |ULTIMATE.start_student_version_~is_divisible~1#1|) (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|) (<= |ULTIMATE.start_student_version_~is_divisible~1#1| 1))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~is_divisible1~0#1|) (= |ULTIMATE.start_student_version_~is_divisible~1#1| |ULTIMATE.start_student_version_#res#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (= |#NULL.base| 0))' at error location [2022-11-19 08:06:22,840 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:06:22,841 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:06:22,841 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 15] total 34 [2022-11-19 08:06:22,841 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1089361886] [2022-11-19 08:06:22,841 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:06:22,841 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2022-11-19 08:06:22,842 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:06:22,842 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2022-11-19 08:06:22,843 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=263, Invalid=1543, Unknown=0, NotChecked=0, Total=1806 [2022-11-19 08:06:22,843 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) [2022-11-19 08:06:23,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:06:23,314 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2022-11-19 08:06:23,315 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-11-19 08:06:23,315 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 [2022-11-19 08:06:23,315 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:06:23,316 INFO L225 Difference]: With dead ends: 25 [2022-11-19 08:06:23,316 INFO L226 Difference]: Without dead ends: 21 [2022-11-19 08:06:23,317 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 23 SyntacticMatches, 7 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1097 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=468, Invalid=1982, Unknown=0, NotChecked=0, Total=2450 [2022-11-19 08:06:23,318 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 66 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 79 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 85 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 79 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 08:06:23,318 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [66 Valid, 9 Invalid, 85 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 79 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 08:06:23,319 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2022-11-19 08:06:23,330 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2022-11-19 08:06:23,330 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) [2022-11-19 08:06:23,330 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2022-11-19 08:06:23,330 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 19 [2022-11-19 08:06:23,331 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:06:23,331 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2022-11-19 08:06:23,331 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) [2022-11-19 08:06:23,331 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2022-11-19 08:06:23,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-11-19 08:06:23,332 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:06:23,332 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:06:23,337 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2022-11-19 08:06:23,537 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-11-19 08:06:23,537 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:06:23,537 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:06:23,537 INFO L85 PathProgramCache]: Analyzing trace with hash 1585528789, now seen corresponding path program 9 times [2022-11-19 08:06:23,537 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:06:23,538 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2000036140] [2022-11-19 08:06:23,538 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:06:23,538 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:06:23,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:06:24,523 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:06:24,523 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:06:24,523 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2000036140] [2022-11-19 08:06:24,523 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2000036140] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:06:24,523 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [999770538] [2022-11-19 08:06:24,524 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 08:06:24,524 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:06:24,524 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:06:24,527 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:06:24,538 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-19 08:06:24,587 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 08:06:24,587 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:06:24,589 WARN L261 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 56 conjunts are in the unsatisfiable core [2022-11-19 08:06:24,591 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:06:26,755 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:06:26,755 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:06:28,273 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:06:28,273 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [999770538] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:06:28,274 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [127239612] [2022-11-19 08:06:28,276 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-19 08:06:28,276 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:06:28,276 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:06:28,276 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:06:28,277 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:06:28,456 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:06:30,223 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2324#(and (<= 4 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_correct_version_#res#1| 1) (<= 4 |ULTIMATE.start_student_version_~w#1|) (<= |ULTIMATE.start_main_~is_divisible1~0#1| 1) (<= 4 |ULTIMATE.start_correct_version_~w#1|) (<= 4 |ULTIMATE.start_student_version_#in~w#1|) (<= 0 |ULTIMATE.start_correct_version_~is_divisible~0#1|) (= ~true~0 1) (<= |ULTIMATE.start_correct_version_~is_divisible~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 4 |ULTIMATE.start_correct_version_#in~w#1|) (not (< |ULTIMATE.start_student_version_~i~1#1| |ULTIMATE.start_student_version_~w#1|)) (= ~false~0 0) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (or (and (not (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start_student_version_~is_divisible~1#1| ~false~0)) (and (<= 1 |ULTIMATE.start_student_version_~is_divisible~1#1|) (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|) (<= |ULTIMATE.start_student_version_~is_divisible~1#1| 1))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~is_divisible1~0#1|) (= |ULTIMATE.start_student_version_~is_divisible~1#1| |ULTIMATE.start_student_version_#res#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (= |#NULL.base| 0))' at error location [2022-11-19 08:06:30,223 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:06:30,223 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:06:30,223 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 52 [2022-11-19 08:06:30,224 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [280086224] [2022-11-19 08:06:30,224 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:06:30,224 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2022-11-19 08:06:30,224 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:06:30,225 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2022-11-19 08:06:30,228 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=214, Invalid=3446, Unknown=0, NotChecked=0, Total=3660 [2022-11-19 08:06:30,228 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand has 52 states, 52 states have (on average 1.0576923076923077) internal successors, (55), 52 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:06:33,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:06:33,607 INFO L93 Difference]: Finished difference Result 37 states and 40 transitions. [2022-11-19 08:06:33,607 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-11-19 08:06:33,608 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 1.0576923076923077) internal successors, (55), 52 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2022-11-19 08:06:33,608 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:06:33,608 INFO L225 Difference]: With dead ends: 37 [2022-11-19 08:06:33,608 INFO L226 Difference]: Without dead ends: 22 [2022-11-19 08:06:33,610 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1284 ImplicationChecksByTransitivity, 7.7s TimeCoverageRelationStatistics Valid=370, Invalid=4742, Unknown=0, NotChecked=0, Total=5112 [2022-11-19 08:06:33,611 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 73 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 613 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 64 SdHoareTripleChecker+Invalid, 621 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 613 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-19 08:06:33,611 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [73 Valid, 64 Invalid, 621 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 613 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-19 08:06:33,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2022-11-19 08:06:33,623 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2022-11-19 08:06:33,623 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) [2022-11-19 08:06:33,623 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 23 transitions. [2022-11-19 08:06:33,624 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 23 transitions. Word has length 20 [2022-11-19 08:06:33,624 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:06:33,624 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 23 transitions. [2022-11-19 08:06:33,624 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 1.0576923076923077) internal successors, (55), 52 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:06:33,625 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 23 transitions. [2022-11-19 08:06:33,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-11-19 08:06:33,625 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:06:33,626 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:06:33,636 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-11-19 08:06:33,835 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-11-19 08:06:33,835 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:06:33,836 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:06:33,836 INFO L85 PathProgramCache]: Analyzing trace with hash 1272711057, now seen corresponding path program 10 times [2022-11-19 08:06:33,836 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:06:33,836 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [458024832] [2022-11-19 08:06:33,836 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:06:33,836 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:06:33,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:06:34,435 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 10 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:06:34,435 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:06:34,435 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [458024832] [2022-11-19 08:06:34,435 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [458024832] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:06:34,435 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1236042377] [2022-11-19 08:06:34,435 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 08:06:34,436 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:06:34,436 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:06:34,437 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:06:34,447 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-19 08:06:34,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:06:34,503 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-19 08:06:34,505 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:06:34,978 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 15 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:06:34,979 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:06:35,425 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:06:35,425 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1236042377] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:06:35,425 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [806175449] [2022-11-19 08:06:35,427 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-19 08:06:35,427 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:06:35,428 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:06:35,428 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:06:35,428 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:06:35,581 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:06:36,790 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2613#(and (<= 4 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_correct_version_#res#1| 1) (<= 4 |ULTIMATE.start_student_version_~w#1|) (<= |ULTIMATE.start_main_~is_divisible1~0#1| 1) (<= 4 |ULTIMATE.start_correct_version_~w#1|) (<= 4 |ULTIMATE.start_student_version_#in~w#1|) (<= 0 |ULTIMATE.start_correct_version_~is_divisible~0#1|) (= ~true~0 1) (<= |ULTIMATE.start_correct_version_~is_divisible~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 4 |ULTIMATE.start_correct_version_#in~w#1|) (not (< |ULTIMATE.start_student_version_~i~1#1| |ULTIMATE.start_student_version_~w#1|)) (= ~false~0 0) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (or (and (not (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start_student_version_~is_divisible~1#1| ~false~0)) (and (<= 1 |ULTIMATE.start_student_version_~is_divisible~1#1|) (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|) (<= |ULTIMATE.start_student_version_~is_divisible~1#1| 1))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~is_divisible1~0#1|) (= |ULTIMATE.start_student_version_~is_divisible~1#1| |ULTIMATE.start_student_version_#res#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (= |#NULL.base| 0))' at error location [2022-11-19 08:06:36,790 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:06:36,790 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:06:36,790 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17, 17] total 39 [2022-11-19 08:06:36,791 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1974275409] [2022-11-19 08:06:36,791 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:06:36,792 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2022-11-19 08:06:36,792 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:06:36,792 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2022-11-19 08:06:36,792 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=333, Invalid=1923, Unknown=0, NotChecked=0, Total=2256 [2022-11-19 08:06:36,793 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) [2022-11-19 08:06:37,353 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:06:37,353 INFO L93 Difference]: Finished difference Result 27 states and 28 transitions. [2022-11-19 08:06:37,354 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-11-19 08:06:37,354 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 [2022-11-19 08:06:37,354 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:06:37,354 INFO L225 Difference]: With dead ends: 27 [2022-11-19 08:06:37,354 INFO L226 Difference]: Without dead ends: 23 [2022-11-19 08:06:37,356 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 25 SyntacticMatches, 8 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1426 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=603, Invalid=2477, Unknown=0, NotChecked=0, Total=3080 [2022-11-19 08:06:37,356 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 85 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 124 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 85 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 130 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 124 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 08:06:37,357 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [85 Valid, 18 Invalid, 130 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 124 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 08:06:37,357 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2022-11-19 08:06:37,370 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2022-11-19 08:06:37,371 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) [2022-11-19 08:06:37,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2022-11-19 08:06:37,371 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 21 [2022-11-19 08:06:37,372 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:06:37,372 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2022-11-19 08:06:37,372 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) [2022-11-19 08:06:37,372 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2022-11-19 08:06:37,373 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-11-19 08:06:37,373 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:06:37,373 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:06:37,385 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-19 08:06:37,585 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:06:37,585 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:06:37,586 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:06:37,586 INFO L85 PathProgramCache]: Analyzing trace with hash 789435922, now seen corresponding path program 11 times [2022-11-19 08:06:37,586 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:06:37,586 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1602752983] [2022-11-19 08:06:37,586 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:06:37,586 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:06:37,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:06:38,730 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:06:38,730 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:06:38,730 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1602752983] [2022-11-19 08:06:38,730 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1602752983] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:06:38,730 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1163611725] [2022-11-19 08:06:38,730 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 08:06:38,731 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:06:38,731 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:06:38,739 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:06:38,763 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-19 08:06:38,811 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-19 08:06:38,811 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:06:38,813 WARN L261 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 60 conjunts are in the unsatisfiable core [2022-11-19 08:06:38,815 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:06:41,115 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:06:41,116 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:06:42,814 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:06:42,815 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1163611725] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:06:42,815 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1601567770] [2022-11-19 08:06:42,817 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-19 08:06:42,817 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:06:42,817 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:06:42,817 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:06:42,817 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:06:42,975 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:06:44,857 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2905#(and (<= 4 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_correct_version_#res#1| 1) (<= 4 |ULTIMATE.start_student_version_~w#1|) (<= |ULTIMATE.start_main_~is_divisible1~0#1| 1) (<= 4 |ULTIMATE.start_correct_version_~w#1|) (<= 4 |ULTIMATE.start_student_version_#in~w#1|) (<= 0 |ULTIMATE.start_correct_version_~is_divisible~0#1|) (= ~true~0 1) (<= |ULTIMATE.start_correct_version_~is_divisible~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 4 |ULTIMATE.start_correct_version_#in~w#1|) (not (< |ULTIMATE.start_student_version_~i~1#1| |ULTIMATE.start_student_version_~w#1|)) (= ~false~0 0) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (or (and (not (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start_student_version_~is_divisible~1#1| ~false~0)) (and (<= 1 |ULTIMATE.start_student_version_~is_divisible~1#1|) (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|) (<= |ULTIMATE.start_student_version_~is_divisible~1#1| 1))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~is_divisible1~0#1|) (= |ULTIMATE.start_student_version_~is_divisible~1#1| |ULTIMATE.start_student_version_#res#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (= |#NULL.base| 0))' at error location [2022-11-19 08:06:44,858 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:06:44,858 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:06:44,858 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 58 [2022-11-19 08:06:44,858 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1213578738] [2022-11-19 08:06:44,858 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:06:44,859 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2022-11-19 08:06:44,859 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:06:44,859 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2022-11-19 08:06:44,861 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=238, Invalid=4184, Unknown=0, NotChecked=0, Total=4422 [2022-11-19 08:06:44,861 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand has 58 states, 58 states have (on average 1.0517241379310345) internal successors, (61), 58 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:06:48,854 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:06:48,854 INFO L93 Difference]: Finished difference Result 40 states and 43 transitions. [2022-11-19 08:06:48,854 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-11-19 08:06:48,855 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 1.0517241379310345) internal successors, (61), 58 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2022-11-19 08:06:48,855 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:06:48,855 INFO L225 Difference]: With dead ends: 40 [2022-11-19 08:06:48,855 INFO L226 Difference]: Without dead ends: 24 [2022-11-19 08:06:48,857 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1575 ImplicationChecksByTransitivity, 8.7s TimeCoverageRelationStatistics Valid=410, Invalid=5752, Unknown=0, NotChecked=0, Total=6162 [2022-11-19 08:06:48,858 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 96 mSDsluCounter, 73 mSDsCounter, 0 mSdLazyCounter, 798 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 96 SdHoareTripleChecker+Valid, 75 SdHoareTripleChecker+Invalid, 806 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 798 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-19 08:06:48,859 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [96 Valid, 75 Invalid, 806 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 798 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-19 08:06:48,859 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2022-11-19 08:06:48,870 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2022-11-19 08:06:48,870 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) [2022-11-19 08:06:48,870 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2022-11-19 08:06:48,871 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 22 [2022-11-19 08:06:48,871 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:06:48,871 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2022-11-19 08:06:48,871 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 58 states have (on average 1.0517241379310345) internal successors, (61), 58 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:06:48,871 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2022-11-19 08:06:48,872 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-11-19 08:06:48,872 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:06:48,872 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:06:48,878 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-11-19 08:06:49,078 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-11-19 08:06:49,078 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:06:49,078 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:06:49,079 INFO L85 PathProgramCache]: Analyzing trace with hash 819306190, now seen corresponding path program 12 times [2022-11-19 08:06:49,079 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:06:49,079 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [468003607] [2022-11-19 08:06:49,079 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:06:49,079 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:06:49,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:06:49,720 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 15 proven. 34 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:06:49,721 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:06:49,721 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [468003607] [2022-11-19 08:06:49,721 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [468003607] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:06:49,721 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1868053811] [2022-11-19 08:06:49,721 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 08:06:49,721 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:06:49,721 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:06:49,723 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:06:49,747 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-19 08:06:49,783 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 08:06:49,783 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:06:49,784 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-19 08:06:49,786 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:06:50,369 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 21 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:06:50,369 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:06:50,840 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:06:50,840 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1868053811] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:06:50,840 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1956190555] [2022-11-19 08:06:50,842 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-19 08:06:50,842 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:06:50,842 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:06:50,842 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:06:50,842 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:06:51,004 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:06:52,110 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3223#(and (<= 4 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_correct_version_#res#1| 1) (<= 4 |ULTIMATE.start_student_version_~w#1|) (<= |ULTIMATE.start_main_~is_divisible1~0#1| 1) (<= 4 |ULTIMATE.start_correct_version_~w#1|) (<= 4 |ULTIMATE.start_student_version_#in~w#1|) (<= 0 |ULTIMATE.start_correct_version_~is_divisible~0#1|) (= ~true~0 1) (<= |ULTIMATE.start_correct_version_~is_divisible~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 4 |ULTIMATE.start_correct_version_#in~w#1|) (not (< |ULTIMATE.start_student_version_~i~1#1| |ULTIMATE.start_student_version_~w#1|)) (= ~false~0 0) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (or (and (not (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start_student_version_~is_divisible~1#1| ~false~0)) (and (<= 1 |ULTIMATE.start_student_version_~is_divisible~1#1|) (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|) (<= |ULTIMATE.start_student_version_~is_divisible~1#1| 1))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~is_divisible1~0#1|) (= |ULTIMATE.start_student_version_~is_divisible~1#1| |ULTIMATE.start_student_version_#res#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (= |#NULL.base| 0))' at error location [2022-11-19 08:06:52,110 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:06:52,110 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:06:52,110 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19, 19] total 44 [2022-11-19 08:06:52,111 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1977662022] [2022-11-19 08:06:52,111 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:06:52,111 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2022-11-19 08:06:52,111 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:06:52,112 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2022-11-19 08:06:52,113 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=412, Invalid=2344, Unknown=0, NotChecked=0, Total=2756 [2022-11-19 08:06:52,113 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) [2022-11-19 08:06:52,665 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:06:52,665 INFO L93 Difference]: Finished difference Result 29 states and 30 transitions. [2022-11-19 08:06:52,665 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-11-19 08:06:52,666 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 [2022-11-19 08:06:52,666 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:06:52,666 INFO L225 Difference]: With dead ends: 29 [2022-11-19 08:06:52,666 INFO L226 Difference]: Without dead ends: 25 [2022-11-19 08:06:52,667 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 27 SyntacticMatches, 9 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1796 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=756, Invalid=3026, Unknown=0, NotChecked=0, Total=3782 [2022-11-19 08:06:52,668 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 151 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 96 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 151 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 107 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 96 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 08:06:52,668 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [151 Valid, 9 Invalid, 107 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 96 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 08:06:52,669 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2022-11-19 08:06:52,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2022-11-19 08:06:52,682 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) [2022-11-19 08:06:52,683 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2022-11-19 08:06:52,683 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 23 [2022-11-19 08:06:52,683 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:06:52,683 INFO L495 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2022-11-19 08:06:52,684 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) [2022-11-19 08:06:52,684 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2022-11-19 08:06:52,684 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-11-19 08:06:52,684 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:06:52,684 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:06:52,696 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-11-19 08:06:52,889 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-11-19 08:06:52,890 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:06:52,890 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:06:52,890 INFO L85 PathProgramCache]: Analyzing trace with hash -381213067, now seen corresponding path program 13 times [2022-11-19 08:06:52,890 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:06:52,890 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1956526315] [2022-11-19 08:06:52,890 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:06:52,891 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:06:52,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:06:54,062 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:06:54,063 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:06:54,063 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1956526315] [2022-11-19 08:06:54,063 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1956526315] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:06:54,063 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [393471856] [2022-11-19 08:06:54,063 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 08:06:54,063 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:06:54,063 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:06:54,065 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:06:54,067 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-19 08:06:54,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:06:54,119 WARN L261 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 62 conjunts are in the unsatisfiable core [2022-11-19 08:06:54,121 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:06:56,941 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:06:56,941 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:06:58,685 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:06:58,685 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [393471856] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:06:58,685 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [124454772] [2022-11-19 08:06:58,687 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-19 08:06:58,687 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:06:58,687 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:06:58,688 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:06:58,688 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:06:58,864 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:07:00,683 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3542#(and (<= 4 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_correct_version_#res#1| 1) (<= 4 |ULTIMATE.start_student_version_~w#1|) (<= |ULTIMATE.start_main_~is_divisible1~0#1| 1) (<= 4 |ULTIMATE.start_correct_version_~w#1|) (<= 4 |ULTIMATE.start_student_version_#in~w#1|) (<= 0 |ULTIMATE.start_correct_version_~is_divisible~0#1|) (= ~true~0 1) (<= |ULTIMATE.start_correct_version_~is_divisible~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 4 |ULTIMATE.start_correct_version_#in~w#1|) (not (< |ULTIMATE.start_student_version_~i~1#1| |ULTIMATE.start_student_version_~w#1|)) (= ~false~0 0) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (or (and (not (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start_student_version_~is_divisible~1#1| ~false~0)) (and (<= 1 |ULTIMATE.start_student_version_~is_divisible~1#1|) (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|) (<= |ULTIMATE.start_student_version_~is_divisible~1#1| 1))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~is_divisible1~0#1|) (= |ULTIMATE.start_student_version_~is_divisible~1#1| |ULTIMATE.start_student_version_#res#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (= |#NULL.base| 0))' at error location [2022-11-19 08:07:00,683 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:07:00,685 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:07:00,685 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 63 [2022-11-19 08:07:00,685 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [912601020] [2022-11-19 08:07:00,685 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:07:00,686 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 63 states [2022-11-19 08:07:00,686 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:07:00,686 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2022-11-19 08:07:00,688 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=259, Invalid=4853, Unknown=0, NotChecked=0, Total=5112 [2022-11-19 08:07:00,688 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand has 63 states, 63 states have (on average 1.0634920634920635) internal successors, (67), 63 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:07:06,266 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:07:06,266 INFO L93 Difference]: Finished difference Result 43 states and 46 transitions. [2022-11-19 08:07:06,267 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-11-19 08:07:06,267 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 63 states have (on average 1.0634920634920635) internal successors, (67), 63 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2022-11-19 08:07:06,267 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:07:06,268 INFO L225 Difference]: With dead ends: 43 [2022-11-19 08:07:06,268 INFO L226 Difference]: Without dead ends: 26 [2022-11-19 08:07:06,269 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1901 ImplicationChecksByTransitivity, 10.5s TimeCoverageRelationStatistics Valid=509, Invalid=6973, Unknown=0, NotChecked=0, Total=7482 [2022-11-19 08:07:06,270 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 146 mSDsluCounter, 84 mSDsCounter, 0 mSdLazyCounter, 1037 mSolverCounterSat, 40 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 146 SdHoareTripleChecker+Valid, 86 SdHoareTripleChecker+Invalid, 1077 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 1037 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-11-19 08:07:06,270 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [146 Valid, 86 Invalid, 1077 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 1037 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-11-19 08:07:06,271 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2022-11-19 08:07:06,297 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2022-11-19 08:07:06,297 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) [2022-11-19 08:07:06,302 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 27 transitions. [2022-11-19 08:07:06,302 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 27 transitions. Word has length 24 [2022-11-19 08:07:06,302 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:07:06,302 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 27 transitions. [2022-11-19 08:07:06,303 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 63 states, 63 states have (on average 1.0634920634920635) internal successors, (67), 63 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:07:06,303 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 27 transitions. [2022-11-19 08:07:06,303 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-11-19 08:07:06,303 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:07:06,304 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:07:06,314 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-11-19 08:07:06,509 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:07:06,510 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:07:06,510 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:07:06,510 INFO L85 PathProgramCache]: Analyzing trace with hash -1740656591, now seen corresponding path program 14 times [2022-11-19 08:07:06,510 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:07:06,510 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [109381232] [2022-11-19 08:07:06,510 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:07:06,510 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:07:06,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:07:07,274 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 21 proven. 43 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:07:07,275 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:07:07,275 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [109381232] [2022-11-19 08:07:07,275 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [109381232] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:07:07,275 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1411713361] [2022-11-19 08:07:07,275 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 08:07:07,275 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:07:07,276 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:07:07,277 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:07:07,313 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-11-19 08:07:07,350 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-11-19 08:07:07,350 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:07:07,352 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 22 conjunts are in the unsatisfiable core [2022-11-19 08:07:07,354 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:07:08,099 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 28 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:07:08,100 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:07:08,704 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 36 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:07:08,705 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1411713361] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:07:08,705 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1921135488] [2022-11-19 08:07:08,706 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-19 08:07:08,707 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:07:08,707 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:07:08,707 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:07:08,707 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:07:08,857 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:07:10,029 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3893#(and (<= 4 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_correct_version_#res#1| 1) (<= 4 |ULTIMATE.start_student_version_~w#1|) (<= |ULTIMATE.start_main_~is_divisible1~0#1| 1) (<= 4 |ULTIMATE.start_correct_version_~w#1|) (<= 4 |ULTIMATE.start_student_version_#in~w#1|) (<= 0 |ULTIMATE.start_correct_version_~is_divisible~0#1|) (= ~true~0 1) (<= |ULTIMATE.start_correct_version_~is_divisible~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 4 |ULTIMATE.start_correct_version_#in~w#1|) (not (< |ULTIMATE.start_student_version_~i~1#1| |ULTIMATE.start_student_version_~w#1|)) (= ~false~0 0) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (or (and (not (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start_student_version_~is_divisible~1#1| ~false~0)) (and (<= 1 |ULTIMATE.start_student_version_~is_divisible~1#1|) (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|) (<= |ULTIMATE.start_student_version_~is_divisible~1#1| 1))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~is_divisible1~0#1|) (= |ULTIMATE.start_student_version_~is_divisible~1#1| |ULTIMATE.start_student_version_#res#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (= |#NULL.base| 0))' at error location [2022-11-19 08:07:10,029 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:07:10,029 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:07:10,029 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21, 21] total 49 [2022-11-19 08:07:10,029 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1740550132] [2022-11-19 08:07:10,030 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:07:10,031 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2022-11-19 08:07:10,031 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:07:10,031 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2022-11-19 08:07:10,032 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=500, Invalid=2806, Unknown=0, NotChecked=0, Total=3306 [2022-11-19 08:07:10,032 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) [2022-11-19 08:07:10,744 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:07:10,744 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2022-11-19 08:07:10,745 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-11-19 08:07:10,745 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 [2022-11-19 08:07:10,745 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:07:10,745 INFO L225 Difference]: With dead ends: 31 [2022-11-19 08:07:10,746 INFO L226 Difference]: Without dead ends: 27 [2022-11-19 08:07:10,746 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 29 SyntacticMatches, 10 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2207 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=927, Invalid=3629, Unknown=0, NotChecked=0, Total=4556 [2022-11-19 08:07:10,747 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 100 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 229 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 100 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 232 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 229 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-19 08:07:10,748 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [100 Valid, 27 Invalid, 232 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 229 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-19 08:07:10,748 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2022-11-19 08:07:10,761 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2022-11-19 08:07:10,761 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.0769230769230769) internal successors, (28), 26 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:07:10,761 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2022-11-19 08:07:10,762 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 25 [2022-11-19 08:07:10,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:07:10,762 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2022-11-19 08:07:10,762 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) [2022-11-19 08:07:10,763 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2022-11-19 08:07:10,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-11-19 08:07:10,763 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:07:10,763 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:07:10,768 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-11-19 08:07:10,965 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:07:10,965 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:07:10,966 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:07:10,966 INFO L85 PathProgramCache]: Analyzing trace with hash 1864319346, now seen corresponding path program 15 times [2022-11-19 08:07:10,966 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:07:10,966 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [496486210] [2022-11-19 08:07:10,966 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:07:10,966 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:07:10,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:07:12,171 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:07:12,171 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:07:12,171 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [496486210] [2022-11-19 08:07:12,172 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [496486210] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:07:12,172 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [154682210] [2022-11-19 08:07:12,172 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 08:07:12,172 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:07:12,172 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:07:12,173 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:07:12,175 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-11-19 08:07:12,222 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 08:07:12,222 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:07:12,224 WARN L261 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 68 conjunts are in the unsatisfiable core [2022-11-19 08:07:12,226 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:07:15,329 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:07:15,329 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:07:17,592 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:07:17,592 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [154682210] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:07:17,593 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1799292736] [2022-11-19 08:07:17,594 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-19 08:07:17,594 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:07:17,595 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:07:17,595 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:07:17,595 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:07:17,752 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:07:19,611 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4241#(and (<= 4 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_correct_version_#res#1| 1) (<= 4 |ULTIMATE.start_student_version_~w#1|) (<= |ULTIMATE.start_main_~is_divisible1~0#1| 1) (<= 4 |ULTIMATE.start_correct_version_~w#1|) (<= 4 |ULTIMATE.start_student_version_#in~w#1|) (<= 0 |ULTIMATE.start_correct_version_~is_divisible~0#1|) (= ~true~0 1) (<= |ULTIMATE.start_correct_version_~is_divisible~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 4 |ULTIMATE.start_correct_version_#in~w#1|) (not (< |ULTIMATE.start_student_version_~i~1#1| |ULTIMATE.start_student_version_~w#1|)) (= ~false~0 0) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (or (and (not (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start_student_version_~is_divisible~1#1| ~false~0)) (and (<= 1 |ULTIMATE.start_student_version_~is_divisible~1#1|) (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|) (<= |ULTIMATE.start_student_version_~is_divisible~1#1| 1))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~is_divisible1~0#1|) (= |ULTIMATE.start_student_version_~is_divisible~1#1| |ULTIMATE.start_student_version_#res#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (= |#NULL.base| 0))' at error location [2022-11-19 08:07:19,611 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:07:19,611 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:07:19,611 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 70 [2022-11-19 08:07:19,611 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1314550107] [2022-11-19 08:07:19,611 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:07:19,612 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 70 states [2022-11-19 08:07:19,612 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:07:19,612 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2022-11-19 08:07:19,612 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=286, Invalid=5876, Unknown=0, NotChecked=0, Total=6162 [2022-11-19 08:07:19,613 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand has 70 states, 70 states have (on average 1.042857142857143) internal successors, (73), 70 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:07:24,298 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:07:24,298 INFO L93 Difference]: Finished difference Result 46 states and 49 transitions. [2022-11-19 08:07:24,299 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-11-19 08:07:24,299 INFO L78 Accepts]: Start accepts. Automaton has has 70 states, 70 states have (on average 1.042857142857143) internal successors, (73), 70 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2022-11-19 08:07:24,299 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:07:24,299 INFO L225 Difference]: With dead ends: 46 [2022-11-19 08:07:24,299 INFO L226 Difference]: Without dead ends: 28 [2022-11-19 08:07:24,300 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2241 ImplicationChecksByTransitivity, 10.3s TimeCoverageRelationStatistics Valid=490, Invalid=8066, Unknown=0, NotChecked=0, Total=8556 [2022-11-19 08:07:24,301 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 105 mSDsluCounter, 85 mSDsCounter, 0 mSdLazyCounter, 1138 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 105 SdHoareTripleChecker+Valid, 87 SdHoareTripleChecker+Invalid, 1146 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 1138 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-11-19 08:07:24,301 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [105 Valid, 87 Invalid, 1146 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 1138 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-11-19 08:07:24,302 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2022-11-19 08:07:24,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2022-11-19 08:07:24,314 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) [2022-11-19 08:07:24,314 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 29 transitions. [2022-11-19 08:07:24,314 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 29 transitions. Word has length 26 [2022-11-19 08:07:24,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:07:24,315 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 29 transitions. [2022-11-19 08:07:24,315 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 70 states, 70 states have (on average 1.042857142857143) internal successors, (73), 70 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:07:24,315 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 29 transitions. [2022-11-19 08:07:24,315 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-11-19 08:07:24,315 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:07:24,316 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:07:24,321 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-11-19 08:07:24,519 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2022-11-19 08:07:24,519 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:07:24,519 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:07:24,519 INFO L85 PathProgramCache]: Analyzing trace with hash 1109150766, now seen corresponding path program 16 times [2022-11-19 08:07:24,520 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:07:24,520 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [8500417] [2022-11-19 08:07:24,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:07:24,520 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:07:24,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:07:25,348 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 28 proven. 53 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:07:25,348 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:07:25,348 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [8500417] [2022-11-19 08:07:25,348 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [8500417] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:07:25,348 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1228578874] [2022-11-19 08:07:25,349 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 08:07:25,349 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:07:25,349 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:07:25,350 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:07:25,352 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-11-19 08:07:25,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:07:25,404 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 24 conjunts are in the unsatisfiable core [2022-11-19 08:07:25,406 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:07:26,130 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 36 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:07:26,130 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:07:26,810 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 45 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:07:26,811 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1228578874] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:07:26,811 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1422699854] [2022-11-19 08:07:26,812 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-19 08:07:26,813 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:07:26,813 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:07:26,813 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:07:26,813 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:07:26,979 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:07:28,314 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4617#(and (<= 4 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_correct_version_#res#1| 1) (<= 4 |ULTIMATE.start_student_version_~w#1|) (<= |ULTIMATE.start_main_~is_divisible1~0#1| 1) (<= 4 |ULTIMATE.start_correct_version_~w#1|) (<= 4 |ULTIMATE.start_student_version_#in~w#1|) (<= 0 |ULTIMATE.start_correct_version_~is_divisible~0#1|) (= ~true~0 1) (<= |ULTIMATE.start_correct_version_~is_divisible~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 4 |ULTIMATE.start_correct_version_#in~w#1|) (not (< |ULTIMATE.start_student_version_~i~1#1| |ULTIMATE.start_student_version_~w#1|)) (= ~false~0 0) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (or (and (not (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start_student_version_~is_divisible~1#1| ~false~0)) (and (<= 1 |ULTIMATE.start_student_version_~is_divisible~1#1|) (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|) (<= |ULTIMATE.start_student_version_~is_divisible~1#1| 1))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~is_divisible1~0#1|) (= |ULTIMATE.start_student_version_~is_divisible~1#1| |ULTIMATE.start_student_version_#res#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (= |#NULL.base| 0))' at error location [2022-11-19 08:07:28,314 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:07:28,314 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:07:28,314 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23, 23] total 54 [2022-11-19 08:07:28,314 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1919172590] [2022-11-19 08:07:28,314 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:07:28,315 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2022-11-19 08:07:28,315 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:07:28,315 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2022-11-19 08:07:28,315 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=597, Invalid=3309, Unknown=0, NotChecked=0, Total=3906 [2022-11-19 08:07:28,316 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) [2022-11-19 08:07:29,056 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:07:29,056 INFO L93 Difference]: Finished difference Result 33 states and 34 transitions. [2022-11-19 08:07:29,059 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-11-19 08:07:29,060 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 [2022-11-19 08:07:29,060 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:07:29,060 INFO L225 Difference]: With dead ends: 33 [2022-11-19 08:07:29,060 INFO L226 Difference]: Without dead ends: 29 [2022-11-19 08:07:29,061 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 31 SyntacticMatches, 11 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2659 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=1116, Invalid=4286, Unknown=0, NotChecked=0, Total=5402 [2022-11-19 08:07:29,062 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 137 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 186 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 137 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 193 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 186 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 08:07:29,062 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [137 Valid, 18 Invalid, 193 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 186 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 08:07:29,063 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2022-11-19 08:07:29,078 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2022-11-19 08:07:29,078 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) [2022-11-19 08:07:29,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2022-11-19 08:07:29,078 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 27 [2022-11-19 08:07:29,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:07:29,079 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2022-11-19 08:07:29,079 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) [2022-11-19 08:07:29,079 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2022-11-19 08:07:29,080 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-11-19 08:07:29,080 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:07:29,080 INFO L195 NwaCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:07:29,085 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-11-19 08:07:29,283 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:07:29,283 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:07:29,283 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:07:29,283 INFO L85 PathProgramCache]: Analyzing trace with hash 14034197, now seen corresponding path program 17 times [2022-11-19 08:07:29,284 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:07:29,284 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1685886835] [2022-11-19 08:07:29,284 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:07:29,284 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:07:29,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:07:30,665 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:07:30,665 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:07:30,666 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1685886835] [2022-11-19 08:07:30,666 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1685886835] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:07:30,666 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2140173000] [2022-11-19 08:07:30,666 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 08:07:30,666 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:07:30,666 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:07:30,667 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:07:30,670 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-11-19 08:07:30,724 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-11-19 08:07:30,724 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:07:30,726 WARN L261 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 73 conjunts are in the unsatisfiable core [2022-11-19 08:07:30,727 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:07:34,074 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:07:34,074 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:07:36,764 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:07:36,765 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2140173000] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:07:36,765 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [98000176] [2022-11-19 08:07:36,766 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-19 08:07:36,767 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:07:36,767 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:07:36,767 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:07:36,767 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:07:36,913 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:07:38,903 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4993#(and (<= 4 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_correct_version_#res#1| 1) (<= 4 |ULTIMATE.start_student_version_~w#1|) (<= |ULTIMATE.start_main_~is_divisible1~0#1| 1) (<= 4 |ULTIMATE.start_correct_version_~w#1|) (<= 4 |ULTIMATE.start_student_version_#in~w#1|) (<= 0 |ULTIMATE.start_correct_version_~is_divisible~0#1|) (= ~true~0 1) (<= |ULTIMATE.start_correct_version_~is_divisible~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 4 |ULTIMATE.start_correct_version_#in~w#1|) (not (< |ULTIMATE.start_student_version_~i~1#1| |ULTIMATE.start_student_version_~w#1|)) (= ~false~0 0) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (or (and (not (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start_student_version_~is_divisible~1#1| ~false~0)) (and (<= 1 |ULTIMATE.start_student_version_~is_divisible~1#1|) (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|) (<= |ULTIMATE.start_student_version_~is_divisible~1#1| 1))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~is_divisible1~0#1|) (= |ULTIMATE.start_student_version_~is_divisible~1#1| |ULTIMATE.start_student_version_#res#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (= |#NULL.base| 0))' at error location [2022-11-19 08:07:38,903 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:07:38,904 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:07:38,904 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 76 [2022-11-19 08:07:38,904 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [889380682] [2022-11-19 08:07:38,904 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:07:38,904 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 76 states [2022-11-19 08:07:38,904 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:07:38,905 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2022-11-19 08:07:38,906 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=332, Invalid=6808, Unknown=0, NotChecked=0, Total=7140 [2022-11-19 08:07:38,906 INFO L87 Difference]: Start difference. First operand 29 states and 30 transitions. Second operand has 76 states, 76 states have (on average 1.0394736842105263) internal successors, (79), 76 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:07:43,788 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:07:43,788 INFO L93 Difference]: Finished difference Result 49 states and 52 transitions. [2022-11-19 08:07:43,789 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-11-19 08:07:43,789 INFO L78 Accepts]: Start accepts. Automaton has has 76 states, 76 states have (on average 1.0394736842105263) internal successors, (79), 76 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2022-11-19 08:07:43,789 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:07:43,790 INFO L225 Difference]: With dead ends: 49 [2022-11-19 08:07:43,790 INFO L226 Difference]: Without dead ends: 30 [2022-11-19 08:07:43,790 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2876 ImplicationChecksByTransitivity, 11.2s TimeCoverageRelationStatistics Valid=573, Invalid=9729, Unknown=0, NotChecked=0, Total=10302 [2022-11-19 08:07:43,791 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 135 mSDsluCounter, 96 mSDsCounter, 0 mSdLazyCounter, 1333 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 135 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 1343 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 1333 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-11-19 08:07:43,791 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [135 Valid, 98 Invalid, 1343 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 1333 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-11-19 08:07:43,792 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2022-11-19 08:07:43,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2022-11-19 08:07:43,806 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) [2022-11-19 08:07:43,806 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2022-11-19 08:07:43,807 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 28 [2022-11-19 08:07:43,807 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:07:43,807 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2022-11-19 08:07:43,807 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 76 states, 76 states have (on average 1.0394736842105263) internal successors, (79), 76 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:07:43,807 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2022-11-19 08:07:43,807 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-11-19 08:07:43,807 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:07:43,807 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:07:43,812 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-11-19 08:07:44,008 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:07:44,008 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:07:44,008 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:07:44,008 INFO L85 PathProgramCache]: Analyzing trace with hash 146501841, now seen corresponding path program 18 times [2022-11-19 08:07:44,008 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:07:44,009 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1735929302] [2022-11-19 08:07:44,009 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:07:44,009 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:07:44,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:07:44,784 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 36 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:07:44,784 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:07:44,785 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1735929302] [2022-11-19 08:07:44,785 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1735929302] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:07:44,785 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [50520055] [2022-11-19 08:07:44,785 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 08:07:44,785 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:07:44,785 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:07:44,786 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:07:44,788 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-11-19 08:07:44,834 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 08:07:44,834 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:07:44,835 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 26 conjunts are in the unsatisfiable core [2022-11-19 08:07:44,837 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:07:45,601 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 45 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:07:45,601 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:07:46,345 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 55 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:07:46,345 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [50520055] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:07:46,345 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1916678151] [2022-11-19 08:07:46,347 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-19 08:07:46,347 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:07:46,348 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:07:46,348 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:07:46,348 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:07:46,509 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:07:47,679 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5402#(and (<= 4 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_correct_version_#res#1| 1) (<= 4 |ULTIMATE.start_student_version_~w#1|) (<= |ULTIMATE.start_main_~is_divisible1~0#1| 1) (<= 4 |ULTIMATE.start_correct_version_~w#1|) (<= 4 |ULTIMATE.start_student_version_#in~w#1|) (<= 0 |ULTIMATE.start_correct_version_~is_divisible~0#1|) (= ~true~0 1) (<= |ULTIMATE.start_correct_version_~is_divisible~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 4 |ULTIMATE.start_correct_version_#in~w#1|) (not (< |ULTIMATE.start_student_version_~i~1#1| |ULTIMATE.start_student_version_~w#1|)) (= ~false~0 0) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (or (and (not (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start_student_version_~is_divisible~1#1| ~false~0)) (and (<= 1 |ULTIMATE.start_student_version_~is_divisible~1#1|) (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|) (<= |ULTIMATE.start_student_version_~is_divisible~1#1| 1))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~is_divisible1~0#1|) (= |ULTIMATE.start_student_version_~is_divisible~1#1| |ULTIMATE.start_student_version_#res#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (= |#NULL.base| 0))' at error location [2022-11-19 08:07:47,680 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:07:47,680 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:07:47,680 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25, 25] total 59 [2022-11-19 08:07:47,680 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1212122094] [2022-11-19 08:07:47,680 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:07:47,680 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2022-11-19 08:07:47,680 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:07:47,681 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2022-11-19 08:07:47,681 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=703, Invalid=3853, Unknown=0, NotChecked=0, Total=4556 [2022-11-19 08:07:47,681 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) [2022-11-19 08:07:48,433 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:07:48,433 INFO L93 Difference]: Finished difference Result 35 states and 36 transitions. [2022-11-19 08:07:48,434 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-11-19 08:07:48,434 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 [2022-11-19 08:07:48,435 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:07:48,435 INFO L225 Difference]: With dead ends: 35 [2022-11-19 08:07:48,435 INFO L226 Difference]: Without dead ends: 31 [2022-11-19 08:07:48,435 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 33 SyntacticMatches, 12 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3152 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=1323, Invalid=4997, Unknown=0, NotChecked=0, Total=6320 [2022-11-19 08:07:48,436 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 109 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 160 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 109 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 169 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 160 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 08:07:48,436 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [109 Valid, 12 Invalid, 169 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 160 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 08:07:48,437 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2022-11-19 08:07:48,455 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2022-11-19 08:07:48,455 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) [2022-11-19 08:07:48,455 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2022-11-19 08:07:48,456 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 29 [2022-11-19 08:07:48,456 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:07:48,456 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2022-11-19 08:07:48,456 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) [2022-11-19 08:07:48,456 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2022-11-19 08:07:48,457 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-11-19 08:07:48,457 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:07:48,457 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:07:48,463 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Ended with exit code 0 [2022-11-19 08:07:48,657 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2022-11-19 08:07:48,658 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:07:48,658 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:07:48,658 INFO L85 PathProgramCache]: Analyzing trace with hash 236688594, now seen corresponding path program 19 times [2022-11-19 08:07:48,658 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:07:48,658 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1639333594] [2022-11-19 08:07:48,658 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:07:48,658 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:07:48,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:07:50,084 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:07:50,084 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:07:50,084 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1639333594] [2022-11-19 08:07:50,084 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1639333594] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:07:50,085 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1015632812] [2022-11-19 08:07:50,085 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 08:07:50,085 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:07:50,085 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:07:50,086 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:07:50,089 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-11-19 08:07:50,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:07:50,135 WARN L261 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 74 conjunts are in the unsatisfiable core [2022-11-19 08:07:50,137 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:07:54,238 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:07:54,238 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:07:56,857 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:07:56,857 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1015632812] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:07:56,857 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [582693719] [2022-11-19 08:07:56,858 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-19 08:07:56,859 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:07:56,859 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:07:56,859 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:07:56,859 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:07:57,020 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:07:59,015 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5805#(and (<= 4 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_correct_version_#res#1| 1) (<= 4 |ULTIMATE.start_student_version_~w#1|) (<= |ULTIMATE.start_main_~is_divisible1~0#1| 1) (<= 4 |ULTIMATE.start_correct_version_~w#1|) (<= 4 |ULTIMATE.start_student_version_#in~w#1|) (<= 0 |ULTIMATE.start_correct_version_~is_divisible~0#1|) (= ~true~0 1) (<= |ULTIMATE.start_correct_version_~is_divisible~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 4 |ULTIMATE.start_correct_version_#in~w#1|) (not (< |ULTIMATE.start_student_version_~i~1#1| |ULTIMATE.start_student_version_~w#1|)) (= ~false~0 0) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (or (and (not (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start_student_version_~is_divisible~1#1| ~false~0)) (and (<= 1 |ULTIMATE.start_student_version_~is_divisible~1#1|) (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|) (<= |ULTIMATE.start_student_version_~is_divisible~1#1| 1))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~is_divisible1~0#1|) (= |ULTIMATE.start_student_version_~is_divisible~1#1| |ULTIMATE.start_student_version_#res#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (= |#NULL.base| 0))' at error location [2022-11-19 08:07:59,015 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:07:59,015 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:07:59,015 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 81 [2022-11-19 08:07:59,015 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [281469841] [2022-11-19 08:07:59,015 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:07:59,016 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 81 states [2022-11-19 08:07:59,016 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:07:59,016 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 81 interpolants. [2022-11-19 08:07:59,016 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=331, Invalid=7679, Unknown=0, NotChecked=0, Total=8010 [2022-11-19 08:07:59,017 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand has 81 states, 81 states have (on average 1.0493827160493827) internal successors, (85), 81 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:08:05,956 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:08:05,957 INFO L93 Difference]: Finished difference Result 52 states and 55 transitions. [2022-11-19 08:08:05,957 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-11-19 08:08:05,957 INFO L78 Accepts]: Start accepts. Automaton has has 81 states, 81 states have (on average 1.0493827160493827) internal successors, (85), 81 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 30 [2022-11-19 08:08:05,957 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:08:05,958 INFO L225 Difference]: With dead ends: 52 [2022-11-19 08:08:05,958 INFO L226 Difference]: Without dead ends: 32 [2022-11-19 08:08:05,959 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 28 SyntacticMatches, 1 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3032 ImplicationChecksByTransitivity, 13.9s TimeCoverageRelationStatistics Valid=641, Invalid=10915, Unknown=0, NotChecked=0, Total=11556 [2022-11-19 08:08:05,960 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 189 mSDsluCounter, 90 mSDsCounter, 0 mSdLazyCounter, 1543 mSolverCounterSat, 53 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 189 SdHoareTripleChecker+Valid, 92 SdHoareTripleChecker+Invalid, 1596 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 53 IncrementalHoareTripleChecker+Valid, 1543 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2022-11-19 08:08:05,960 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [189 Valid, 92 Invalid, 1596 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [53 Valid, 1543 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2022-11-19 08:08:05,961 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2022-11-19 08:08:05,981 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2022-11-19 08:08:05,982 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) [2022-11-19 08:08:05,982 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 33 transitions. [2022-11-19 08:08:05,982 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 33 transitions. Word has length 30 [2022-11-19 08:08:05,982 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:08:05,983 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 33 transitions. [2022-11-19 08:08:05,983 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 81 states, 81 states have (on average 1.0493827160493827) internal successors, (85), 81 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:08:05,983 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 33 transitions. [2022-11-19 08:08:05,983 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-11-19 08:08:05,983 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:08:05,983 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:08:05,988 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2022-11-19 08:08:06,184 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2022-11-19 08:08:06,184 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:08:06,184 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:08:06,184 INFO L85 PathProgramCache]: Analyzing trace with hash -1310924402, now seen corresponding path program 20 times [2022-11-19 08:08:06,185 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:08:06,185 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2073372318] [2022-11-19 08:08:06,185 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:08:06,185 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:08:06,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:08:07,105 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 45 proven. 76 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:08:07,106 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:08:07,107 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2073372318] [2022-11-19 08:08:07,107 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2073372318] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:08:07,107 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1374801373] [2022-11-19 08:08:07,107 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 08:08:07,107 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:08:07,107 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:08:07,108 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:08:07,111 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-11-19 08:08:07,168 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2022-11-19 08:08:07,168 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:08:07,169 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 28 conjunts are in the unsatisfiable core [2022-11-19 08:08:07,170 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:08:08,057 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 55 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:08:08,057 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:08:08,902 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 66 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:08:08,902 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1374801373] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:08:08,902 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [906354253] [2022-11-19 08:08:08,903 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-19 08:08:08,904 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:08:08,904 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:08:08,904 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:08:08,904 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:08:09,073 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:08:10,274 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6243#(and (<= 4 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_correct_version_#res#1| 1) (<= 4 |ULTIMATE.start_student_version_~w#1|) (<= |ULTIMATE.start_main_~is_divisible1~0#1| 1) (<= 4 |ULTIMATE.start_correct_version_~w#1|) (<= 4 |ULTIMATE.start_student_version_#in~w#1|) (<= 0 |ULTIMATE.start_correct_version_~is_divisible~0#1|) (= ~true~0 1) (<= |ULTIMATE.start_correct_version_~is_divisible~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 4 |ULTIMATE.start_correct_version_#in~w#1|) (not (< |ULTIMATE.start_student_version_~i~1#1| |ULTIMATE.start_student_version_~w#1|)) (= ~false~0 0) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (or (and (not (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start_student_version_~is_divisible~1#1| ~false~0)) (and (<= 1 |ULTIMATE.start_student_version_~is_divisible~1#1|) (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|) (<= |ULTIMATE.start_student_version_~is_divisible~1#1| 1))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~is_divisible1~0#1|) (= |ULTIMATE.start_student_version_~is_divisible~1#1| |ULTIMATE.start_student_version_#res#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (= |#NULL.base| 0))' at error location [2022-11-19 08:08:10,274 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:08:10,274 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:08:10,274 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27, 27] total 64 [2022-11-19 08:08:10,274 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [790956384] [2022-11-19 08:08:10,274 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:08:10,275 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 64 states [2022-11-19 08:08:10,275 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:08:10,276 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2022-11-19 08:08:10,276 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=818, Invalid=4438, Unknown=0, NotChecked=0, Total=5256 [2022-11-19 08:08:10,277 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) [2022-11-19 08:08:11,087 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:08:11,087 INFO L93 Difference]: Finished difference Result 37 states and 38 transitions. [2022-11-19 08:08:11,087 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-11-19 08:08:11,088 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 [2022-11-19 08:08:11,088 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:08:11,088 INFO L225 Difference]: With dead ends: 37 [2022-11-19 08:08:11,088 INFO L226 Difference]: Without dead ends: 33 [2022-11-19 08:08:11,089 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 35 SyntacticMatches, 13 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3686 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=1548, Invalid=5762, Unknown=0, NotChecked=0, Total=7310 [2022-11-19 08:08:11,089 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 115 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 218 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 115 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 225 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 218 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-19 08:08:11,090 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [115 Valid, 21 Invalid, 225 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 218 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-19 08:08:11,090 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2022-11-19 08:08:11,109 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2022-11-19 08:08:11,109 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) [2022-11-19 08:08:11,109 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2022-11-19 08:08:11,109 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 31 [2022-11-19 08:08:11,110 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:08:11,110 INFO L495 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2022-11-19 08:08:11,110 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) [2022-11-19 08:08:11,110 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2022-11-19 08:08:11,110 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-11-19 08:08:11,110 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:08:11,111 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:08:11,116 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2022-11-19 08:08:11,315 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2022-11-19 08:08:11,316 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:08:11,316 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:08:11,316 INFO L85 PathProgramCache]: Analyzing trace with hash -1993851979, now seen corresponding path program 21 times [2022-11-19 08:08:11,316 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:08:11,316 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1949423690] [2022-11-19 08:08:11,316 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:08:11,316 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:08:11,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:08:12,811 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:08:12,811 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:08:12,812 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1949423690] [2022-11-19 08:08:12,812 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1949423690] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:08:12,812 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1937597743] [2022-11-19 08:08:12,812 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 08:08:12,812 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:08:12,812 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:08:12,813 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:08:12,819 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-11-19 08:08:12,864 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 08:08:12,864 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:08:12,866 WARN L261 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 80 conjunts are in the unsatisfiable core [2022-11-19 08:08:12,867 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:08:16,985 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:08:16,985 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:08:20,092 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:08:20,093 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1937597743] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:08:20,093 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1251110466] [2022-11-19 08:08:20,094 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-19 08:08:20,094 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:08:20,095 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:08:20,095 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:08:20,095 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:08:20,228 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:08:22,336 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6675#(and (<= 4 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_correct_version_#res#1| 1) (<= 4 |ULTIMATE.start_student_version_~w#1|) (<= |ULTIMATE.start_main_~is_divisible1~0#1| 1) (<= 4 |ULTIMATE.start_correct_version_~w#1|) (<= 4 |ULTIMATE.start_student_version_#in~w#1|) (<= 0 |ULTIMATE.start_correct_version_~is_divisible~0#1|) (= ~true~0 1) (<= |ULTIMATE.start_correct_version_~is_divisible~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 4 |ULTIMATE.start_correct_version_#in~w#1|) (not (< |ULTIMATE.start_student_version_~i~1#1| |ULTIMATE.start_student_version_~w#1|)) (= ~false~0 0) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (or (and (not (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start_student_version_~is_divisible~1#1| ~false~0)) (and (<= 1 |ULTIMATE.start_student_version_~is_divisible~1#1|) (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|) (<= |ULTIMATE.start_student_version_~is_divisible~1#1| 1))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~is_divisible1~0#1|) (= |ULTIMATE.start_student_version_~is_divisible~1#1| |ULTIMATE.start_student_version_#res#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (= |#NULL.base| 0))' at error location [2022-11-19 08:08:22,336 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:08:22,336 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:08:22,336 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 88 [2022-11-19 08:08:22,337 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [745856343] [2022-11-19 08:08:22,337 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:08:22,337 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 88 states [2022-11-19 08:08:22,337 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:08:22,338 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 88 interpolants. [2022-11-19 08:08:22,338 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=358, Invalid=8954, Unknown=0, NotChecked=0, Total=9312 [2022-11-19 08:08:22,339 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand has 88 states, 88 states have (on average 1.0340909090909092) internal successors, (91), 88 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:08:28,645 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:08:28,645 INFO L93 Difference]: Finished difference Result 55 states and 58 transitions. [2022-11-19 08:08:28,646 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-11-19 08:08:28,646 INFO L78 Accepts]: Start accepts. Automaton has has 88 states, 88 states have (on average 1.0340909090909092) internal successors, (91), 88 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 32 [2022-11-19 08:08:28,646 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:08:28,646 INFO L225 Difference]: With dead ends: 55 [2022-11-19 08:08:28,646 INFO L226 Difference]: Without dead ends: 34 [2022-11-19 08:08:28,647 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3450 ImplicationChecksByTransitivity, 13.7s TimeCoverageRelationStatistics Valid=610, Invalid=12272, Unknown=0, NotChecked=0, Total=12882 [2022-11-19 08:08:28,648 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 150 mSDsluCounter, 100 mSDsCounter, 0 mSdLazyCounter, 1814 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 150 SdHoareTripleChecker+Valid, 102 SdHoareTripleChecker+Invalid, 1822 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 1814 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-11-19 08:08:28,648 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [150 Valid, 102 Invalid, 1822 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 1814 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2022-11-19 08:08:28,649 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2022-11-19 08:08:28,663 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2022-11-19 08:08:28,663 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) [2022-11-19 08:08:28,663 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 35 transitions. [2022-11-19 08:08:28,663 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 35 transitions. Word has length 32 [2022-11-19 08:08:28,663 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:08:28,663 INFO L495 AbstractCegarLoop]: Abstraction has 34 states and 35 transitions. [2022-11-19 08:08:28,663 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 88 states, 88 states have (on average 1.0340909090909092) internal successors, (91), 88 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:08:28,663 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 35 transitions. [2022-11-19 08:08:28,664 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-11-19 08:08:28,664 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:08:28,664 INFO L195 NwaCegarLoop]: trace histogram [12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:08:28,668 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2022-11-19 08:08:28,864 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:08:28,864 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:08:28,865 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:08:28,865 INFO L85 PathProgramCache]: Analyzing trace with hash 1103710577, now seen corresponding path program 22 times [2022-11-19 08:08:28,865 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:08:28,865 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2064554293] [2022-11-19 08:08:28,865 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:08:28,865 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:08:28,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:08:29,851 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 55 proven. 89 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:08:29,851 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:08:29,851 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2064554293] [2022-11-19 08:08:29,851 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2064554293] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:08:29,852 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [871766942] [2022-11-19 08:08:29,852 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 08:08:29,852 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:08:29,852 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:08:29,853 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:08:29,855 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-11-19 08:08:29,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:08:29,903 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 30 conjunts are in the unsatisfiable core [2022-11-19 08:08:29,904 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:08:30,843 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 66 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:08:30,843 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:08:31,731 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 78 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:08:31,731 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [871766942] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:08:31,731 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2090666182] [2022-11-19 08:08:31,732 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-19 08:08:31,732 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:08:31,733 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:08:31,733 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:08:31,733 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:08:31,872 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:08:33,074 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7138#(and (<= 4 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_correct_version_#res#1| 1) (<= 4 |ULTIMATE.start_student_version_~w#1|) (<= |ULTIMATE.start_main_~is_divisible1~0#1| 1) (<= 4 |ULTIMATE.start_correct_version_~w#1|) (<= 4 |ULTIMATE.start_student_version_#in~w#1|) (<= 0 |ULTIMATE.start_correct_version_~is_divisible~0#1|) (= ~true~0 1) (<= |ULTIMATE.start_correct_version_~is_divisible~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 4 |ULTIMATE.start_correct_version_#in~w#1|) (not (< |ULTIMATE.start_student_version_~i~1#1| |ULTIMATE.start_student_version_~w#1|)) (= ~false~0 0) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (or (and (not (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start_student_version_~is_divisible~1#1| ~false~0)) (and (<= 1 |ULTIMATE.start_student_version_~is_divisible~1#1|) (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|) (<= |ULTIMATE.start_student_version_~is_divisible~1#1| 1))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~is_divisible1~0#1|) (= |ULTIMATE.start_student_version_~is_divisible~1#1| |ULTIMATE.start_student_version_#res#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (= |#NULL.base| 0))' at error location [2022-11-19 08:08:33,075 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:08:33,075 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:08:33,075 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29, 29] total 69 [2022-11-19 08:08:33,075 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1904816406] [2022-11-19 08:08:33,075 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:08:33,076 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 69 states [2022-11-19 08:08:33,076 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:08:33,076 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2022-11-19 08:08:33,077 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=942, Invalid=5064, Unknown=0, NotChecked=0, Total=6006 [2022-11-19 08:08:33,077 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) [2022-11-19 08:08:33,938 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:08:33,939 INFO L93 Difference]: Finished difference Result 39 states and 40 transitions. [2022-11-19 08:08:33,939 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-11-19 08:08:33,939 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 [2022-11-19 08:08:33,939 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:08:33,940 INFO L225 Difference]: With dead ends: 39 [2022-11-19 08:08:33,940 INFO L226 Difference]: Without dead ends: 35 [2022-11-19 08:08:33,940 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 37 SyntacticMatches, 14 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4261 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=1791, Invalid=6581, Unknown=0, NotChecked=0, Total=8372 [2022-11-19 08:08:33,941 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 160 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 214 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 160 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 224 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 214 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 08:08:33,941 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [160 Valid, 20 Invalid, 224 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 214 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 08:08:33,942 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2022-11-19 08:08:33,957 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2022-11-19 08:08:33,958 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) [2022-11-19 08:08:33,958 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2022-11-19 08:08:33,958 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 33 [2022-11-19 08:08:33,958 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:08:33,958 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 36 transitions. [2022-11-19 08:08:33,958 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) [2022-11-19 08:08:33,959 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 36 transitions. [2022-11-19 08:08:33,959 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-11-19 08:08:33,959 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:08:33,959 INFO L195 NwaCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:08:33,963 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2022-11-19 08:08:34,159 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2022-11-19 08:08:34,160 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:08:34,160 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:08:34,160 INFO L85 PathProgramCache]: Analyzing trace with hash -154611662, now seen corresponding path program 23 times [2022-11-19 08:08:34,160 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:08:34,160 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [711236694] [2022-11-19 08:08:34,160 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:08:34,160 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:08:34,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:08:35,798 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:08:35,798 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:08:35,798 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [711236694] [2022-11-19 08:08:35,798 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [711236694] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:08:35,799 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1558243218] [2022-11-19 08:08:35,799 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 08:08:35,799 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:08:35,799 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:08:35,800 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:08:35,802 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-11-19 08:08:35,853 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2022-11-19 08:08:35,853 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:08:35,855 WARN L261 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 86 conjunts are in the unsatisfiable core [2022-11-19 08:08:35,857 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:08:40,682 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:08:40,682 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:08:44,893 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:08:44,893 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1558243218] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:08:44,893 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [721501540] [2022-11-19 08:08:44,895 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-19 08:08:44,895 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:08:44,895 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:08:44,895 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:08:44,895 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:08:45,029 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:08:47,183 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7598#(and (<= 4 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_correct_version_#res#1| 1) (<= 4 |ULTIMATE.start_student_version_~w#1|) (<= |ULTIMATE.start_main_~is_divisible1~0#1| 1) (<= 4 |ULTIMATE.start_correct_version_~w#1|) (<= 4 |ULTIMATE.start_student_version_#in~w#1|) (<= 0 |ULTIMATE.start_correct_version_~is_divisible~0#1|) (= ~true~0 1) (<= |ULTIMATE.start_correct_version_~is_divisible~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 4 |ULTIMATE.start_correct_version_#in~w#1|) (not (< |ULTIMATE.start_student_version_~i~1#1| |ULTIMATE.start_student_version_~w#1|)) (= ~false~0 0) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (or (and (not (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start_student_version_~is_divisible~1#1| ~false~0)) (and (<= 1 |ULTIMATE.start_student_version_~is_divisible~1#1|) (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|) (<= |ULTIMATE.start_student_version_~is_divisible~1#1| 1))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~is_divisible1~0#1|) (= |ULTIMATE.start_student_version_~is_divisible~1#1| |ULTIMATE.start_student_version_#res#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (= |#NULL.base| 0))' at error location [2022-11-19 08:08:47,183 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:08:47,183 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:08:47,183 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 94 [2022-11-19 08:08:47,183 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [90281150] [2022-11-19 08:08:47,183 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:08:47,184 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 94 states [2022-11-19 08:08:47,184 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:08:47,184 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 94 interpolants. [2022-11-19 08:08:47,185 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=427, Invalid=10079, Unknown=0, NotChecked=0, Total=10506 [2022-11-19 08:08:47,185 INFO L87 Difference]: Start difference. First operand 35 states and 36 transitions. Second operand has 94 states, 94 states have (on average 1.0319148936170213) internal successors, (97), 94 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:09:09,811 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:09:09,811 INFO L93 Difference]: Finished difference Result 115 states and 133 transitions. [2022-11-19 08:09:09,811 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2022-11-19 08:09:09,812 INFO L78 Accepts]: Start accepts. Automaton has has 94 states, 94 states have (on average 1.0319148936170213) internal successors, (97), 94 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 34 [2022-11-19 08:09:09,812 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:09:09,813 INFO L225 Difference]: With dead ends: 115 [2022-11-19 08:09:09,813 INFO L226 Difference]: Without dead ends: 89 [2022-11-19 08:09:09,815 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 202 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 170 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8507 ImplicationChecksByTransitivity, 30.8s TimeCoverageRelationStatistics Valid=1722, Invalid=27690, Unknown=0, NotChecked=0, Total=29412 [2022-11-19 08:09:09,816 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 701 mSDsluCounter, 91 mSDsCounter, 0 mSdLazyCounter, 2046 mSolverCounterSat, 206 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 701 SdHoareTripleChecker+Valid, 93 SdHoareTripleChecker+Invalid, 2252 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 206 IncrementalHoareTripleChecker+Valid, 2046 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2022-11-19 08:09:09,816 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [701 Valid, 93 Invalid, 2252 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [206 Valid, 2046 Invalid, 0 Unknown, 0 Unchecked, 2.0s Time] [2022-11-19 08:09:09,816 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2022-11-19 08:09:09,852 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 52. [2022-11-19 08:09:09,853 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) [2022-11-19 08:09:09,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 66 transitions. [2022-11-19 08:09:09,853 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 66 transitions. Word has length 34 [2022-11-19 08:09:09,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:09:09,853 INFO L495 AbstractCegarLoop]: Abstraction has 52 states and 66 transitions. [2022-11-19 08:09:09,853 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 94 states, 94 states have (on average 1.0319148936170213) internal successors, (97), 94 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:09:09,853 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 66 transitions. [2022-11-19 08:09:09,854 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-11-19 08:09:09,854 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:09:09,854 INFO L195 NwaCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:09:09,858 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2022-11-19 08:09:10,054 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2022-11-19 08:09:10,054 INFO L420 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:09:10,055 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:09:10,055 INFO L85 PathProgramCache]: Analyzing trace with hash 1605855829, now seen corresponding path program 24 times [2022-11-19 08:09:10,055 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:09:10,055 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [914711202] [2022-11-19 08:09:10,055 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:09:10,055 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:09:10,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:09:11,859 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:09:11,859 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:09:11,859 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [914711202] [2022-11-19 08:09:11,859 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [914711202] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:09:11,859 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1804074443] [2022-11-19 08:09:11,859 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 08:09:11,860 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:09:11,860 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:09:11,861 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:09:11,867 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2022-11-19 08:09:11,919 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 08:09:11,919 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:09:11,921 WARN L261 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 88 conjunts are in the unsatisfiable core [2022-11-19 08:09:11,923 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:09:16,952 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:09:16,952 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:09:20,852 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:09:20,852 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1804074443] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:09:20,853 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1802912369] [2022-11-19 08:09:20,854 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-19 08:09:20,854 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:09:20,854 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:09:20,854 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:09:20,855 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:09:20,984 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:09:23,229 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8359#(and (<= 4 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_correct_version_#res#1| 1) (<= 4 |ULTIMATE.start_student_version_~w#1|) (<= |ULTIMATE.start_main_~is_divisible1~0#1| 1) (<= 4 |ULTIMATE.start_correct_version_~w#1|) (<= 4 |ULTIMATE.start_student_version_#in~w#1|) (<= 0 |ULTIMATE.start_correct_version_~is_divisible~0#1|) (= ~true~0 1) (<= |ULTIMATE.start_correct_version_~is_divisible~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 4 |ULTIMATE.start_correct_version_#in~w#1|) (not (< |ULTIMATE.start_student_version_~i~1#1| |ULTIMATE.start_student_version_~w#1|)) (= ~false~0 0) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (or (and (not (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start_student_version_~is_divisible~1#1| ~false~0)) (and (<= 1 |ULTIMATE.start_student_version_~is_divisible~1#1|) (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|) (<= |ULTIMATE.start_student_version_~is_divisible~1#1| 1))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~is_divisible1~0#1|) (= |ULTIMATE.start_student_version_~is_divisible~1#1| |ULTIMATE.start_student_version_#res#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (= |#NULL.base| 0))' at error location [2022-11-19 08:09:23,229 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:09:23,230 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:09:23,230 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 100 [2022-11-19 08:09:23,230 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1922780036] [2022-11-19 08:09:23,230 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:09:23,230 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 100 states [2022-11-19 08:09:23,230 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:09:23,231 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 100 interpolants. [2022-11-19 08:09:23,231 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=406, Invalid=11366, Unknown=0, NotChecked=0, Total=11772 [2022-11-19 08:09:23,231 INFO L87 Difference]: Start difference. First operand 52 states and 66 transitions. Second operand has 100 states, 100 states have (on average 1.03) internal successors, (103), 100 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:09:30,817 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:09:30,817 INFO L93 Difference]: Finished difference Result 75 states and 90 transitions. [2022-11-19 08:09:30,817 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-11-19 08:09:30,818 INFO L78 Accepts]: Start accepts. Automaton has has 100 states, 100 states have (on average 1.03) internal successors, (103), 100 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 36 [2022-11-19 08:09:30,818 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:09:30,818 INFO L225 Difference]: With dead ends: 75 [2022-11-19 08:09:30,818 INFO L226 Difference]: Without dead ends: 52 [2022-11-19 08:09:30,819 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4396 ImplicationChecksByTransitivity, 16.3s TimeCoverageRelationStatistics Valid=690, Invalid=15566, Unknown=0, NotChecked=0, Total=16256 [2022-11-19 08:09:30,820 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 197 mSDsluCounter, 133 mSDsCounter, 0 mSdLazyCounter, 2394 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 197 SdHoareTripleChecker+Valid, 135 SdHoareTripleChecker+Invalid, 2402 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 2394 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2022-11-19 08:09:30,821 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [197 Valid, 135 Invalid, 2402 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 2394 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2022-11-19 08:09:30,823 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2022-11-19 08:09:30,869 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2022-11-19 08:09:30,869 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) [2022-11-19 08:09:30,870 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 65 transitions. [2022-11-19 08:09:30,870 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 65 transitions. Word has length 36 [2022-11-19 08:09:30,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:09:30,870 INFO L495 AbstractCegarLoop]: Abstraction has 52 states and 65 transitions. [2022-11-19 08:09:30,871 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 100 states, 100 states have (on average 1.03) internal successors, (103), 100 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:09:30,871 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 65 transitions. [2022-11-19 08:09:30,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-11-19 08:09:30,871 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:09:30,872 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:09:30,879 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2022-11-19 08:09:31,079 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:09:31,079 INFO L420 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:09:31,079 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:09:31,079 INFO L85 PathProgramCache]: Analyzing trace with hash -1587332591, now seen corresponding path program 25 times [2022-11-19 08:09:31,079 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:09:31,080 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [697952271] [2022-11-19 08:09:31,080 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:09:31,080 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:09:31,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:09:32,222 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 78 proven. 118 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:09:32,222 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:09:32,222 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [697952271] [2022-11-19 08:09:32,222 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [697952271] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:09:32,222 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [801923216] [2022-11-19 08:09:32,222 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 08:09:32,223 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:09:32,223 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:09:32,223 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:09:32,227 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2022-11-19 08:09:32,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:09:32,276 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 34 conjunts are in the unsatisfiable core [2022-11-19 08:09:32,277 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:09:33,451 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 91 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:09:33,452 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:09:34,577 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 105 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:09:34,577 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [801923216] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:09:34,578 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [84636556] [2022-11-19 08:09:34,579 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-19 08:09:34,579 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:09:34,579 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:09:34,580 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:09:34,580 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:09:34,708 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:09:35,978 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8934#(and (<= 4 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_correct_version_#res#1| 1) (<= 4 |ULTIMATE.start_student_version_~w#1|) (<= |ULTIMATE.start_main_~is_divisible1~0#1| 1) (<= 4 |ULTIMATE.start_correct_version_~w#1|) (<= 4 |ULTIMATE.start_student_version_#in~w#1|) (<= 0 |ULTIMATE.start_correct_version_~is_divisible~0#1|) (= ~true~0 1) (<= |ULTIMATE.start_correct_version_~is_divisible~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 4 |ULTIMATE.start_correct_version_#in~w#1|) (not (< |ULTIMATE.start_student_version_~i~1#1| |ULTIMATE.start_student_version_~w#1|)) (= ~false~0 0) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (or (and (not (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start_student_version_~is_divisible~1#1| ~false~0)) (and (<= 1 |ULTIMATE.start_student_version_~is_divisible~1#1|) (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|) (<= |ULTIMATE.start_student_version_~is_divisible~1#1| 1))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~is_divisible1~0#1|) (= |ULTIMATE.start_student_version_~is_divisible~1#1| |ULTIMATE.start_student_version_#res#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (= |#NULL.base| 0))' at error location [2022-11-19 08:09:35,978 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:09:35,978 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:09:35,978 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 33, 33] total 79 [2022-11-19 08:09:35,978 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1733539729] [2022-11-19 08:09:35,979 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:09:35,979 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 79 states [2022-11-19 08:09:35,979 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:09:35,979 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2022-11-19 08:09:35,980 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1217, Invalid=6439, Unknown=0, NotChecked=0, Total=7656 [2022-11-19 08:09:35,980 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) [2022-11-19 08:09:37,137 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:09:37,138 INFO L93 Difference]: Finished difference Result 70 states and 84 transitions. [2022-11-19 08:09:37,138 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-11-19 08:09:37,138 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 [2022-11-19 08:09:37,139 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:09:37,139 INFO L225 Difference]: With dead ends: 70 [2022-11-19 08:09:37,139 INFO L226 Difference]: Without dead ends: 66 [2022-11-19 08:09:37,140 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 41 SyntacticMatches, 16 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5534 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=2331, Invalid=8381, Unknown=0, NotChecked=0, Total=10712 [2022-11-19 08:09:37,141 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 178 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 304 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 178 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 309 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 304 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-19 08:09:37,141 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [178 Valid, 27 Invalid, 309 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 304 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-19 08:09:37,142 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2022-11-19 08:09:37,183 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 39. [2022-11-19 08:09:37,183 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) [2022-11-19 08:09:37,184 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2022-11-19 08:09:37,184 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 37 [2022-11-19 08:09:37,184 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:09:37,184 INFO L495 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2022-11-19 08:09:37,184 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) [2022-11-19 08:09:37,185 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2022-11-19 08:09:37,185 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-11-19 08:09:37,185 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:09:37,185 INFO L195 NwaCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:09:37,195 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2022-11-19 08:09:37,391 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2022-11-19 08:09:37,391 INFO L420 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:09:37,391 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:09:37,391 INFO L85 PathProgramCache]: Analyzing trace with hash -1972571246, now seen corresponding path program 26 times [2022-11-19 08:09:37,391 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:09:37,391 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [652894977] [2022-11-19 08:09:37,392 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:09:37,392 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:09:37,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:09:39,367 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:09:39,371 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:09:39,371 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [652894977] [2022-11-19 08:09:39,371 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [652894977] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:09:39,372 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1695593314] [2022-11-19 08:09:39,372 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 08:09:39,372 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:09:39,372 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:09:39,373 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:09:39,376 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2022-11-19 08:09:39,431 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2022-11-19 08:09:39,431 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:09:39,433 WARN L261 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 92 conjunts are in the unsatisfiable core [2022-11-19 08:09:39,435 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:09:45,484 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:09:45,484 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:09:49,885 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:09:49,885 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1695593314] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:09:49,885 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1091682842] [2022-11-19 08:09:49,887 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-19 08:09:49,887 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:09:49,887 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:09:49,887 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:09:49,887 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:09:50,024 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:09:52,343 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9503#(and (<= 4 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_correct_version_#res#1| 1) (<= 4 |ULTIMATE.start_student_version_~w#1|) (<= |ULTIMATE.start_main_~is_divisible1~0#1| 1) (<= 4 |ULTIMATE.start_correct_version_~w#1|) (<= 4 |ULTIMATE.start_student_version_#in~w#1|) (<= 0 |ULTIMATE.start_correct_version_~is_divisible~0#1|) (= ~true~0 1) (<= |ULTIMATE.start_correct_version_~is_divisible~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 4 |ULTIMATE.start_correct_version_#in~w#1|) (not (< |ULTIMATE.start_student_version_~i~1#1| |ULTIMATE.start_student_version_~w#1|)) (= ~false~0 0) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (or (and (not (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start_student_version_~is_divisible~1#1| ~false~0)) (and (<= 1 |ULTIMATE.start_student_version_~is_divisible~1#1|) (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|) (<= |ULTIMATE.start_student_version_~is_divisible~1#1| 1))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~is_divisible1~0#1|) (= |ULTIMATE.start_student_version_~is_divisible~1#1| |ULTIMATE.start_student_version_#res#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (= |#NULL.base| 0))' at error location [2022-11-19 08:09:52,343 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:09:52,343 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:09:52,343 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 106 [2022-11-19 08:09:52,343 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1828505475] [2022-11-19 08:09:52,344 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:09:52,344 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 106 states [2022-11-19 08:09:52,344 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:09:52,344 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 106 interpolants. [2022-11-19 08:09:52,345 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=430, Invalid=12680, Unknown=0, NotChecked=0, Total=13110 [2022-11-19 08:09:52,346 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand has 106 states, 106 states have (on average 1.028301886792453) internal successors, (109), 106 states have internal predecessors, (109), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:10:00,644 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:10:00,644 INFO L93 Difference]: Finished difference Result 64 states and 67 transitions. [2022-11-19 08:10:00,644 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2022-11-19 08:10:00,644 INFO L78 Accepts]: Start accepts. Automaton has has 106 states, 106 states have (on average 1.028301886792453) internal successors, (109), 106 states have internal predecessors, (109), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 38 [2022-11-19 08:10:00,644 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:10:00,645 INFO L225 Difference]: With dead ends: 64 [2022-11-19 08:10:00,645 INFO L226 Difference]: Without dead ends: 40 [2022-11-19 08:10:00,646 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 133 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4911 ImplicationChecksByTransitivity, 18.3s TimeCoverageRelationStatistics Valid=730, Invalid=17360, Unknown=0, NotChecked=0, Total=18090 [2022-11-19 08:10:00,647 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 186 mSDsluCounter, 132 mSDsCounter, 0 mSdLazyCounter, 2743 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 186 SdHoareTripleChecker+Valid, 134 SdHoareTripleChecker+Invalid, 2751 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 2743 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2022-11-19 08:10:00,647 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [186 Valid, 134 Invalid, 2751 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 2743 Invalid, 0 Unknown, 0 Unchecked, 2.1s Time] [2022-11-19 08:10:00,647 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2022-11-19 08:10:00,684 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2022-11-19 08:10:00,684 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) [2022-11-19 08:10:00,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 41 transitions. [2022-11-19 08:10:00,685 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 41 transitions. Word has length 38 [2022-11-19 08:10:00,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:10:00,685 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 41 transitions. [2022-11-19 08:10:00,685 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 106 states, 106 states have (on average 1.028301886792453) internal successors, (109), 106 states have internal predecessors, (109), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:10:00,685 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 41 transitions. [2022-11-19 08:10:00,686 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-11-19 08:10:00,686 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:10:00,686 INFO L195 NwaCegarLoop]: trace histogram [15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:10:00,691 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2022-11-19 08:10:00,886 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable31 [2022-11-19 08:10:00,886 INFO L420 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:10:00,887 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:10:00,887 INFO L85 PathProgramCache]: Analyzing trace with hash 274973774, now seen corresponding path program 27 times [2022-11-19 08:10:00,887 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:10:00,887 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [853000514] [2022-11-19 08:10:00,887 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:10:00,887 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:10:00,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:10:02,205 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 91 proven. 134 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:10:02,206 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:10:02,206 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [853000514] [2022-11-19 08:10:02,206 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [853000514] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:10:02,206 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [79733474] [2022-11-19 08:10:02,206 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 08:10:02,206 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:10:02,206 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:10:02,207 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:10:02,209 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2022-11-19 08:10:02,267 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 08:10:02,267 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:10:02,269 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 36 conjunts are in the unsatisfiable core [2022-11-19 08:10:02,271 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:10:03,559 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 105 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:10:03,559 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:10:04,814 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 120 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:10:04,814 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [79733474] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:10:04,814 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [837144968] [2022-11-19 08:10:04,815 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-19 08:10:04,816 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:10:04,816 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:10:04,816 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:10:04,816 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:10:04,941 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:10:06,235 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10053#(and (<= 4 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_correct_version_#res#1| 1) (<= 4 |ULTIMATE.start_student_version_~w#1|) (<= |ULTIMATE.start_main_~is_divisible1~0#1| 1) (<= 4 |ULTIMATE.start_correct_version_~w#1|) (<= 4 |ULTIMATE.start_student_version_#in~w#1|) (<= 0 |ULTIMATE.start_correct_version_~is_divisible~0#1|) (= ~true~0 1) (<= |ULTIMATE.start_correct_version_~is_divisible~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 4 |ULTIMATE.start_correct_version_#in~w#1|) (not (< |ULTIMATE.start_student_version_~i~1#1| |ULTIMATE.start_student_version_~w#1|)) (= ~false~0 0) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (or (and (not (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start_student_version_~is_divisible~1#1| ~false~0)) (and (<= 1 |ULTIMATE.start_student_version_~is_divisible~1#1|) (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|) (<= |ULTIMATE.start_student_version_~is_divisible~1#1| 1))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~is_divisible1~0#1|) (= |ULTIMATE.start_student_version_~is_divisible~1#1| |ULTIMATE.start_student_version_#res#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (= |#NULL.base| 0))' at error location [2022-11-19 08:10:06,235 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:10:06,235 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:10:06,235 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 35, 35] total 84 [2022-11-19 08:10:06,235 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [95700097] [2022-11-19 08:10:06,235 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:10:06,236 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 84 states [2022-11-19 08:10:06,236 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:10:06,236 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2022-11-19 08:10:06,236 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1368, Invalid=7188, Unknown=0, NotChecked=0, Total=8556 [2022-11-19 08:10:06,237 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) [2022-11-19 08:10:07,375 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:10:07,375 INFO L93 Difference]: Finished difference Result 45 states and 46 transitions. [2022-11-19 08:10:07,376 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-11-19 08:10:07,376 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 [2022-11-19 08:10:07,376 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:10:07,376 INFO L225 Difference]: With dead ends: 45 [2022-11-19 08:10:07,376 INFO L226 Difference]: Without dead ends: 41 [2022-11-19 08:10:07,377 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 43 SyntacticMatches, 17 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6232 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=2628, Invalid=9362, Unknown=0, NotChecked=0, Total=11990 [2022-11-19 08:10:07,379 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 184 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 236 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 184 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 245 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 236 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-19 08:10:07,380 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [184 Valid, 18 Invalid, 245 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 236 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-19 08:10:07,380 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2022-11-19 08:10:07,413 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2022-11-19 08:10:07,413 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) [2022-11-19 08:10:07,413 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 42 transitions. [2022-11-19 08:10:07,413 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 42 transitions. Word has length 39 [2022-11-19 08:10:07,414 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:10:07,414 INFO L495 AbstractCegarLoop]: Abstraction has 41 states and 42 transitions. [2022-11-19 08:10:07,414 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) [2022-11-19 08:10:07,414 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 42 transitions. [2022-11-19 08:10:07,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-11-19 08:10:07,415 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:10:07,415 INFO L195 NwaCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:10:07,427 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2022-11-19 08:10:07,620 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2022-11-19 08:10:07,621 INFO L420 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:10:07,621 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:10:07,621 INFO L85 PathProgramCache]: Analyzing trace with hash -75648779, now seen corresponding path program 28 times [2022-11-19 08:10:07,621 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:10:07,621 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2147092509] [2022-11-19 08:10:07,621 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:10:07,622 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:10:07,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:10:09,624 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:10:09,624 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:10:09,624 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2147092509] [2022-11-19 08:10:09,624 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2147092509] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:10:09,624 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1027130255] [2022-11-19 08:10:09,624 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 08:10:09,624 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:10:09,625 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:10:09,625 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:10:09,628 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2022-11-19 08:10:09,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:10:09,677 WARN L261 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 94 conjunts are in the unsatisfiable core [2022-11-19 08:10:09,679 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:10:15,524 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:10:15,525 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:10:20,039 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:10:20,040 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1027130255] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:10:20,040 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1154326489] [2022-11-19 08:10:20,041 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-19 08:10:20,041 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:10:20,042 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:10:20,042 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:10:20,042 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:10:20,184 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:10:22,664 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10596#(and (<= 4 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_correct_version_#res#1| 1) (<= 4 |ULTIMATE.start_student_version_~w#1|) (<= |ULTIMATE.start_main_~is_divisible1~0#1| 1) (<= 4 |ULTIMATE.start_correct_version_~w#1|) (<= 4 |ULTIMATE.start_student_version_#in~w#1|) (<= 0 |ULTIMATE.start_correct_version_~is_divisible~0#1|) (= ~true~0 1) (<= |ULTIMATE.start_correct_version_~is_divisible~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 4 |ULTIMATE.start_correct_version_#in~w#1|) (not (< |ULTIMATE.start_student_version_~i~1#1| |ULTIMATE.start_student_version_~w#1|)) (= ~false~0 0) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (or (and (not (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start_student_version_~is_divisible~1#1| ~false~0)) (and (<= 1 |ULTIMATE.start_student_version_~is_divisible~1#1|) (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|) (<= |ULTIMATE.start_student_version_~is_divisible~1#1| 1))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~is_divisible1~0#1|) (= |ULTIMATE.start_student_version_~is_divisible~1#1| |ULTIMATE.start_student_version_#res#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (= |#NULL.base| 0))' at error location [2022-11-19 08:10:22,665 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:10:22,665 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:10:22,665 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 111 [2022-11-19 08:10:22,665 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [408993545] [2022-11-19 08:10:22,665 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:10:22,665 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 111 states [2022-11-19 08:10:22,665 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:10:22,666 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 111 interpolants. [2022-11-19 08:10:22,667 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=451, Invalid=13829, Unknown=0, NotChecked=0, Total=14280 [2022-11-19 08:10:22,667 INFO L87 Difference]: Start difference. First operand 41 states and 42 transitions. Second operand has 111 states, 111 states have (on average 1.0360360360360361) internal successors, (115), 111 states have internal predecessors, (115), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:10:33,964 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:10:33,964 INFO L93 Difference]: Finished difference Result 67 states and 70 transitions. [2022-11-19 08:10:33,964 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2022-11-19 08:10:33,964 INFO L78 Accepts]: Start accepts. Automaton has has 111 states, 111 states have (on average 1.0360360360360361) internal successors, (115), 111 states have internal predecessors, (115), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 40 [2022-11-19 08:10:33,965 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:10:33,965 INFO L225 Difference]: With dead ends: 67 [2022-11-19 08:10:33,965 INFO L226 Difference]: Without dead ends: 42 [2022-11-19 08:10:33,966 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 180 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 141 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5443 ImplicationChecksByTransitivity, 21.4s TimeCoverageRelationStatistics Valid=861, Invalid=19445, Unknown=0, NotChecked=0, Total=20306 [2022-11-19 08:10:33,966 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 249 mSDsluCounter, 141 mSDsCounter, 0 mSdLazyCounter, 2946 mSolverCounterSat, 73 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 249 SdHoareTripleChecker+Valid, 143 SdHoareTripleChecker+Invalid, 3019 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 73 IncrementalHoareTripleChecker+Valid, 2946 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2022-11-19 08:10:33,967 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [249 Valid, 143 Invalid, 3019 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [73 Valid, 2946 Invalid, 0 Unknown, 0 Unchecked, 2.3s Time] [2022-11-19 08:10:33,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2022-11-19 08:10:34,023 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2022-11-19 08:10:34,023 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) [2022-11-19 08:10:34,023 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2022-11-19 08:10:34,024 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 40 [2022-11-19 08:10:34,024 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:10:34,024 INFO L495 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2022-11-19 08:10:34,024 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 111 states, 111 states have (on average 1.0360360360360361) internal successors, (115), 111 states have internal predecessors, (115), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:10:34,024 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2022-11-19 08:10:34,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-11-19 08:10:34,024 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:10:34,025 INFO L195 NwaCegarLoop]: trace histogram [16, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:10:34,031 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2022-11-19 08:10:34,225 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:10:34,225 INFO L420 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:10:34,225 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:10:34,226 INFO L85 PathProgramCache]: Analyzing trace with hash -553434447, now seen corresponding path program 29 times [2022-11-19 08:10:34,226 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:10:34,226 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1638669421] [2022-11-19 08:10:34,226 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:10:34,226 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:10:34,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:10:35,669 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 105 proven. 151 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:10:35,669 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:10:35,669 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1638669421] [2022-11-19 08:10:35,669 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1638669421] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:10:35,669 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [361806649] [2022-11-19 08:10:35,669 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 08:10:35,670 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:10:35,670 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:10:35,671 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:10:35,673 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2022-11-19 08:10:35,732 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2022-11-19 08:10:35,732 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:10:35,734 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 38 conjunts are in the unsatisfiable core [2022-11-19 08:10:35,735 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:10:37,170 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 120 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:10:37,170 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:10:38,560 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 136 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:10:38,560 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [361806649] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:10:38,560 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1781869514] [2022-11-19 08:10:38,561 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-19 08:10:38,561 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:10:38,562 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:10:38,562 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:10:38,562 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:10:38,682 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:10:40,056 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11179#(and (<= 4 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_correct_version_#res#1| 1) (<= 4 |ULTIMATE.start_student_version_~w#1|) (<= |ULTIMATE.start_main_~is_divisible1~0#1| 1) (<= 4 |ULTIMATE.start_correct_version_~w#1|) (<= 4 |ULTIMATE.start_student_version_#in~w#1|) (<= 0 |ULTIMATE.start_correct_version_~is_divisible~0#1|) (= ~true~0 1) (<= |ULTIMATE.start_correct_version_~is_divisible~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 4 |ULTIMATE.start_correct_version_#in~w#1|) (not (< |ULTIMATE.start_student_version_~i~1#1| |ULTIMATE.start_student_version_~w#1|)) (= ~false~0 0) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (or (and (not (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start_student_version_~is_divisible~1#1| ~false~0)) (and (<= 1 |ULTIMATE.start_student_version_~is_divisible~1#1|) (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|) (<= |ULTIMATE.start_student_version_~is_divisible~1#1| 1))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~is_divisible1~0#1|) (= |ULTIMATE.start_student_version_~is_divisible~1#1| |ULTIMATE.start_student_version_#res#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (= |#NULL.base| 0))' at error location [2022-11-19 08:10:40,056 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:10:40,056 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:10:40,057 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 37, 37] total 89 [2022-11-19 08:10:40,057 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [651847566] [2022-11-19 08:10:40,057 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:10:40,057 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 89 states [2022-11-19 08:10:40,057 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:10:40,058 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2022-11-19 08:10:40,059 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1528, Invalid=7978, Unknown=0, NotChecked=0, Total=9506 [2022-11-19 08:10:40,059 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) [2022-11-19 08:10:41,365 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:10:41,365 INFO L93 Difference]: Finished difference Result 47 states and 48 transitions. [2022-11-19 08:10:41,366 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-11-19 08:10:41,366 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 [2022-11-19 08:10:41,366 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:10:41,366 INFO L225 Difference]: With dead ends: 47 [2022-11-19 08:10:41,367 INFO L226 Difference]: Without dead ends: 43 [2022-11-19 08:10:41,367 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 177 GetRequests, 45 SyntacticMatches, 18 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6971 ImplicationChecksByTransitivity, 5.8s TimeCoverageRelationStatistics Valid=2943, Invalid=10397, Unknown=0, NotChecked=0, Total=13340 [2022-11-19 08:10:41,368 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 287 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 314 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 287 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 321 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 314 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-19 08:10:41,368 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [287 Valid, 18 Invalid, 321 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 314 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-19 08:10:41,369 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2022-11-19 08:10:41,414 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2022-11-19 08:10:41,414 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) [2022-11-19 08:10:41,415 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 44 transitions. [2022-11-19 08:10:41,415 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 44 transitions. Word has length 41 [2022-11-19 08:10:41,415 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:10:41,415 INFO L495 AbstractCegarLoop]: Abstraction has 43 states and 44 transitions. [2022-11-19 08:10:41,436 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) [2022-11-19 08:10:41,436 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 44 transitions. [2022-11-19 08:10:41,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2022-11-19 08:10:41,437 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:10:41,437 INFO L195 NwaCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:10:41,443 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2022-11-19 08:10:41,642 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2022-11-19 08:10:41,642 INFO L420 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:10:41,642 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:10:41,642 INFO L85 PathProgramCache]: Analyzing trace with hash 13500146, now seen corresponding path program 30 times [2022-11-19 08:10:41,643 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:10:41,643 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1486680502] [2022-11-19 08:10:41,643 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:10:41,643 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:10:41,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:10:43,898 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:10:43,899 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:10:43,899 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1486680502] [2022-11-19 08:10:43,899 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1486680502] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:10:43,899 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1698943105] [2022-11-19 08:10:43,899 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 08:10:43,899 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:10:43,899 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:10:43,900 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:10:43,902 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2022-11-19 08:10:43,953 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 08:10:43,953 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:10:43,955 WARN L261 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 100 conjunts are in the unsatisfiable core [2022-11-19 08:10:43,957 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:10:51,279 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:10:51,279 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:10:56,648 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:10:56,649 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1698943105] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:10:56,649 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [879852035] [2022-11-19 08:10:56,650 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-19 08:10:56,650 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:10:56,650 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:10:56,650 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:10:56,651 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:10:56,774 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:10:59,252 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11751#(and (<= 4 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_correct_version_#res#1| 1) (<= 4 |ULTIMATE.start_student_version_~w#1|) (<= |ULTIMATE.start_main_~is_divisible1~0#1| 1) (<= 4 |ULTIMATE.start_correct_version_~w#1|) (<= 4 |ULTIMATE.start_student_version_#in~w#1|) (<= 0 |ULTIMATE.start_correct_version_~is_divisible~0#1|) (= ~true~0 1) (<= |ULTIMATE.start_correct_version_~is_divisible~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 4 |ULTIMATE.start_correct_version_#in~w#1|) (not (< |ULTIMATE.start_student_version_~i~1#1| |ULTIMATE.start_student_version_~w#1|)) (= ~false~0 0) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (or (and (not (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start_student_version_~is_divisible~1#1| ~false~0)) (and (<= 1 |ULTIMATE.start_student_version_~is_divisible~1#1|) (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|) (<= |ULTIMATE.start_student_version_~is_divisible~1#1| 1))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~is_divisible1~0#1|) (= |ULTIMATE.start_student_version_~is_divisible~1#1| |ULTIMATE.start_student_version_#res#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (= |#NULL.base| 0))' at error location [2022-11-19 08:10:59,252 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:10:59,252 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:10:59,252 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41] total 118 [2022-11-19 08:10:59,252 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [36190568] [2022-11-19 08:10:59,252 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:10:59,253 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 118 states [2022-11-19 08:10:59,253 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:10:59,253 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 118 interpolants. [2022-11-19 08:10:59,254 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=478, Invalid=15524, Unknown=0, NotChecked=0, Total=16002 [2022-11-19 08:10:59,254 INFO L87 Difference]: Start difference. First operand 43 states and 44 transitions. Second operand has 118 states, 118 states have (on average 1.0254237288135593) internal successors, (121), 118 states have internal predecessors, (121), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:11:08,954 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:11:08,955 INFO L93 Difference]: Finished difference Result 70 states and 73 transitions. [2022-11-19 08:11:08,955 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2022-11-19 08:11:08,955 INFO L78 Accepts]: Start accepts. Automaton has has 118 states, 118 states have (on average 1.0254237288135593) internal successors, (121), 118 states have internal predecessors, (121), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 42 [2022-11-19 08:11:08,955 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:11:08,956 INFO L225 Difference]: With dead ends: 70 [2022-11-19 08:11:08,956 INFO L226 Difference]: Without dead ends: 44 [2022-11-19 08:11:08,957 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 187 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 147 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6025 ImplicationChecksByTransitivity, 21.9s TimeCoverageRelationStatistics Valid=810, Invalid=21242, Unknown=0, NotChecked=0, Total=22052 [2022-11-19 08:11:08,958 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 213 mSDsluCounter, 146 mSDsCounter, 0 mSdLazyCounter, 3145 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 213 SdHoareTripleChecker+Valid, 148 SdHoareTripleChecker+Invalid, 3153 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 3145 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2022-11-19 08:11:08,959 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [213 Valid, 148 Invalid, 3153 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 3145 Invalid, 0 Unknown, 0 Unchecked, 2.4s Time] [2022-11-19 08:11:08,959 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-11-19 08:11:08,995 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2022-11-19 08:11:08,995 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) [2022-11-19 08:11:08,995 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 45 transitions. [2022-11-19 08:11:08,995 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 45 transitions. Word has length 42 [2022-11-19 08:11:08,996 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:11:08,996 INFO L495 AbstractCegarLoop]: Abstraction has 44 states and 45 transitions. [2022-11-19 08:11:08,996 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 118 states, 118 states have (on average 1.0254237288135593) internal successors, (121), 118 states have internal predecessors, (121), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:11:08,996 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 45 transitions. [2022-11-19 08:11:08,997 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-11-19 08:11:08,997 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:11:08,997 INFO L195 NwaCegarLoop]: trace histogram [17, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:11:09,003 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2022-11-19 08:11:09,197 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2022-11-19 08:11:09,197 INFO L420 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:11:09,198 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:11:09,198 INFO L85 PathProgramCache]: Analyzing trace with hash 422973870, now seen corresponding path program 31 times [2022-11-19 08:11:09,198 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:11:09,198 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1468405290] [2022-11-19 08:11:09,198 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:11:09,198 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:11:09,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:11:10,727 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 120 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:11:10,728 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:11:10,728 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1468405290] [2022-11-19 08:11:10,728 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1468405290] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:11:10,728 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [920085208] [2022-11-19 08:11:10,728 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 08:11:10,728 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:11:10,728 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:11:10,729 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:11:10,731 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2022-11-19 08:11:10,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:11:10,787 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 40 conjunts are in the unsatisfiable core [2022-11-19 08:11:10,788 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:11:12,332 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 136 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:11:12,332 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:11:13,865 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 153 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:11:13,866 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [920085208] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:11:13,866 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [570870701] [2022-11-19 08:11:13,867 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-19 08:11:13,867 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:11:13,868 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:11:13,868 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:11:13,868 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:11:13,992 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:11:15,363 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12359#(and (<= 4 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_correct_version_#res#1| 1) (<= 4 |ULTIMATE.start_student_version_~w#1|) (<= |ULTIMATE.start_main_~is_divisible1~0#1| 1) (<= 4 |ULTIMATE.start_correct_version_~w#1|) (<= 4 |ULTIMATE.start_student_version_#in~w#1|) (<= 0 |ULTIMATE.start_correct_version_~is_divisible~0#1|) (= ~true~0 1) (<= |ULTIMATE.start_correct_version_~is_divisible~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 4 |ULTIMATE.start_correct_version_#in~w#1|) (not (< |ULTIMATE.start_student_version_~i~1#1| |ULTIMATE.start_student_version_~w#1|)) (= ~false~0 0) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (or (and (not (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start_student_version_~is_divisible~1#1| ~false~0)) (and (<= 1 |ULTIMATE.start_student_version_~is_divisible~1#1|) (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|) (<= |ULTIMATE.start_student_version_~is_divisible~1#1| 1))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~is_divisible1~0#1|) (= |ULTIMATE.start_student_version_~is_divisible~1#1| |ULTIMATE.start_student_version_#res#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (= |#NULL.base| 0))' at error location [2022-11-19 08:11:15,363 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:11:15,363 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:11:15,363 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 39, 39] total 94 [2022-11-19 08:11:15,363 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2076031925] [2022-11-19 08:11:15,363 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:11:15,363 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 94 states [2022-11-19 08:11:15,364 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:11:15,364 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 94 interpolants. [2022-11-19 08:11:15,365 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1697, Invalid=8809, Unknown=0, NotChecked=0, Total=10506 [2022-11-19 08:11:15,365 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) [2022-11-19 08:11:16,654 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:11:16,654 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2022-11-19 08:11:16,655 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2022-11-19 08:11:16,655 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 [2022-11-19 08:11:16,655 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:11:16,655 INFO L225 Difference]: With dead ends: 49 [2022-11-19 08:11:16,655 INFO L226 Difference]: Without dead ends: 45 [2022-11-19 08:11:16,656 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 186 GetRequests, 47 SyntacticMatches, 19 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7751 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=3276, Invalid=11486, Unknown=0, NotChecked=0, Total=14762 [2022-11-19 08:11:16,656 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 224 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 248 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 224 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 255 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 248 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-19 08:11:16,657 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [224 Valid, 15 Invalid, 255 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 248 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-19 08:11:16,657 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2022-11-19 08:11:16,691 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2022-11-19 08:11:16,691 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) [2022-11-19 08:11:16,692 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2022-11-19 08:11:16,692 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 43 [2022-11-19 08:11:16,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:11:16,692 INFO L495 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2022-11-19 08:11:16,692 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) [2022-11-19 08:11:16,693 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2022-11-19 08:11:16,693 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-11-19 08:11:16,693 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:11:16,693 INFO L195 NwaCegarLoop]: trace histogram [17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:11:16,699 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2022-11-19 08:11:16,893 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2022-11-19 08:11:16,893 INFO L420 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:11:16,894 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:11:16,894 INFO L85 PathProgramCache]: Analyzing trace with hash 217386901, now seen corresponding path program 32 times [2022-11-19 08:11:16,894 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:11:16,894 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [325821698] [2022-11-19 08:11:16,894 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:11:16,894 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:11:16,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:11:19,257 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:11:19,257 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:11:19,258 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [325821698] [2022-11-19 08:11:19,258 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [325821698] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:11:19,258 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [689778081] [2022-11-19 08:11:19,258 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 08:11:19,258 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:11:19,258 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:11:19,259 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:11:19,261 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2022-11-19 08:11:19,320 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2022-11-19 08:11:19,320 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:11:19,323 WARN L261 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 104 conjunts are in the unsatisfiable core [2022-11-19 08:11:19,324 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:11:27,425 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:11:27,425 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:11:33,404 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:11:33,404 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [689778081] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:11:33,404 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [467946973] [2022-11-19 08:11:33,405 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-19 08:11:33,405 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:11:33,405 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:11:33,406 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:11:33,406 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:11:33,529 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:11:36,146 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12959#(and (<= 4 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_correct_version_#res#1| 1) (<= 4 |ULTIMATE.start_student_version_~w#1|) (<= |ULTIMATE.start_main_~is_divisible1~0#1| 1) (<= 4 |ULTIMATE.start_correct_version_~w#1|) (<= 4 |ULTIMATE.start_student_version_#in~w#1|) (<= 0 |ULTIMATE.start_correct_version_~is_divisible~0#1|) (= ~true~0 1) (<= |ULTIMATE.start_correct_version_~is_divisible~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 4 |ULTIMATE.start_correct_version_#in~w#1|) (not (< |ULTIMATE.start_student_version_~i~1#1| |ULTIMATE.start_student_version_~w#1|)) (= ~false~0 0) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (or (and (not (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start_student_version_~is_divisible~1#1| ~false~0)) (and (<= 1 |ULTIMATE.start_student_version_~is_divisible~1#1|) (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|) (<= |ULTIMATE.start_student_version_~is_divisible~1#1| 1))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~is_divisible1~0#1|) (= |ULTIMATE.start_student_version_~is_divisible~1#1| |ULTIMATE.start_student_version_#res#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (= |#NULL.base| 0))' at error location [2022-11-19 08:11:36,146 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:11:36,146 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:11:36,146 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43] total 124 [2022-11-19 08:11:36,147 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1573090454] [2022-11-19 08:11:36,147 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:11:36,147 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 124 states [2022-11-19 08:11:36,147 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:11:36,148 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 124 interpolants. [2022-11-19 08:11:36,148 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=502, Invalid=17054, Unknown=0, NotChecked=0, Total=17556 [2022-11-19 08:11:36,149 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand has 124 states, 124 states have (on average 1.0241935483870968) internal successors, (127), 124 states have internal predecessors, (127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:11:46,391 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:11:46,391 INFO L93 Difference]: Finished difference Result 73 states and 76 transitions. [2022-11-19 08:11:46,392 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2022-11-19 08:11:46,392 INFO L78 Accepts]: Start accepts. Automaton has has 124 states, 124 states have (on average 1.0241935483870968) internal successors, (127), 124 states have internal predecessors, (127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 44 [2022-11-19 08:11:46,392 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:11:46,392 INFO L225 Difference]: With dead ends: 73 [2022-11-19 08:11:46,392 INFO L226 Difference]: Without dead ends: 46 [2022-11-19 08:11:46,393 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 154 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6624 ImplicationChecksByTransitivity, 23.7s TimeCoverageRelationStatistics Valid=850, Invalid=23330, Unknown=0, NotChecked=0, Total=24180 [2022-11-19 08:11:46,394 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 202 mSDsluCounter, 145 mSDsCounter, 0 mSdLazyCounter, 3274 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 202 SdHoareTripleChecker+Valid, 147 SdHoareTripleChecker+Invalid, 3282 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 3274 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2022-11-19 08:11:46,394 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [202 Valid, 147 Invalid, 3282 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 3274 Invalid, 0 Unknown, 0 Unchecked, 2.5s Time] [2022-11-19 08:11:46,394 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2022-11-19 08:11:46,436 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2022-11-19 08:11:46,436 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) [2022-11-19 08:11:46,437 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 47 transitions. [2022-11-19 08:11:46,437 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 47 transitions. Word has length 44 [2022-11-19 08:11:46,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:11:46,437 INFO L495 AbstractCegarLoop]: Abstraction has 46 states and 47 transitions. [2022-11-19 08:11:46,437 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 124 states, 124 states have (on average 1.0241935483870968) internal successors, (127), 124 states have internal predecessors, (127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:11:46,437 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 47 transitions. [2022-11-19 08:11:46,437 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2022-11-19 08:11:46,438 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:11:46,438 INFO L195 NwaCegarLoop]: trace histogram [18, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:11:46,446 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2022-11-19 08:11:46,638 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37,35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:11:46,638 INFO L420 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:11:46,638 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:11:46,639 INFO L85 PathProgramCache]: Analyzing trace with hash -1415355567, now seen corresponding path program 33 times [2022-11-19 08:11:46,639 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:11:46,639 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1153897614] [2022-11-19 08:11:46,639 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:11:46,639 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:11:46,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:11:48,221 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 136 proven. 188 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:11:48,221 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:11:48,221 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1153897614] [2022-11-19 08:11:48,221 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1153897614] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:11:48,222 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [908310590] [2022-11-19 08:11:48,222 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 08:11:48,222 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:11:48,222 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:11:48,223 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:11:48,227 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2022-11-19 08:11:48,287 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 08:11:48,287 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:11:48,289 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 42 conjunts are in the unsatisfiable core [2022-11-19 08:11:48,291 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:11:49,961 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 153 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:11:49,961 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:11:51,616 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 171 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:11:51,616 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [908310590] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:11:51,616 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1591160462] [2022-11-19 08:11:51,617 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-19 08:11:51,617 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:11:51,617 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:11:51,617 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:11:51,618 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:11:51,753 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:11:53,164 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13596#(and (<= 4 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_correct_version_#res#1| 1) (<= 4 |ULTIMATE.start_student_version_~w#1|) (<= |ULTIMATE.start_main_~is_divisible1~0#1| 1) (<= 4 |ULTIMATE.start_correct_version_~w#1|) (<= 4 |ULTIMATE.start_student_version_#in~w#1|) (<= 0 |ULTIMATE.start_correct_version_~is_divisible~0#1|) (= ~true~0 1) (<= |ULTIMATE.start_correct_version_~is_divisible~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 4 |ULTIMATE.start_correct_version_#in~w#1|) (not (< |ULTIMATE.start_student_version_~i~1#1| |ULTIMATE.start_student_version_~w#1|)) (= ~false~0 0) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (or (and (not (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start_student_version_~is_divisible~1#1| ~false~0)) (and (<= 1 |ULTIMATE.start_student_version_~is_divisible~1#1|) (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|) (<= |ULTIMATE.start_student_version_~is_divisible~1#1| 1))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~is_divisible1~0#1|) (= |ULTIMATE.start_student_version_~is_divisible~1#1| |ULTIMATE.start_student_version_#res#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (= |#NULL.base| 0))' at error location [2022-11-19 08:11:53,164 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:11:53,167 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:11:53,167 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 41, 41] total 99 [2022-11-19 08:11:53,167 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1920069368] [2022-11-19 08:11:53,167 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:11:53,168 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 99 states [2022-11-19 08:11:53,168 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:11:53,169 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 99 interpolants. [2022-11-19 08:11:53,169 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1875, Invalid=9681, Unknown=0, NotChecked=0, Total=11556 [2022-11-19 08:11:53,170 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) [2022-11-19 08:11:54,575 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:11:54,575 INFO L93 Difference]: Finished difference Result 51 states and 52 transitions. [2022-11-19 08:11:54,575 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2022-11-19 08:11:54,576 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 [2022-11-19 08:11:54,576 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:11:54,576 INFO L225 Difference]: With dead ends: 51 [2022-11-19 08:11:54,576 INFO L226 Difference]: Without dead ends: 47 [2022-11-19 08:11:54,580 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 49 SyntacticMatches, 20 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8572 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=3627, Invalid=12629, Unknown=0, NotChecked=0, Total=16256 [2022-11-19 08:11:54,581 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 103 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 273 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 103 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 279 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 273 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-19 08:11:54,582 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [103 Valid, 15 Invalid, 279 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 273 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-19 08:11:54,582 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2022-11-19 08:11:54,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2022-11-19 08:11:54,622 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 46 states have (on average 1.0434782608695652) internal successors, (48), 46 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:11:54,622 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 48 transitions. [2022-11-19 08:11:54,622 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 48 transitions. Word has length 45 [2022-11-19 08:11:54,622 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:11:54,622 INFO L495 AbstractCegarLoop]: Abstraction has 47 states and 48 transitions. [2022-11-19 08:11:54,623 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) [2022-11-19 08:11:54,623 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 48 transitions. [2022-11-19 08:11:54,623 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-11-19 08:11:54,623 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:11:54,623 INFO L195 NwaCegarLoop]: trace histogram [18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:11:54,627 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2022-11-19 08:11:54,823 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2022-11-19 08:11:54,824 INFO L420 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:11:54,824 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:11:54,824 INFO L85 PathProgramCache]: Analyzing trace with hash -936250798, now seen corresponding path program 34 times [2022-11-19 08:11:54,824 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:11:54,824 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [377858678] [2022-11-19 08:11:54,824 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:11:54,824 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:11:54,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:11:57,447 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:11:57,448 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:11:57,448 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [377858678] [2022-11-19 08:11:57,448 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [377858678] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:11:57,448 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1770252843] [2022-11-19 08:11:57,448 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 08:11:57,448 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:11:57,448 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:11:57,449 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:11:57,452 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2022-11-19 08:11:57,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:11:57,508 WARN L261 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 106 conjunts are in the unsatisfiable core [2022-11-19 08:11:57,510 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:12:05,936 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:12:05,937 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:12:11,933 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:12:11,933 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1770252843] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:12:11,933 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [406254476] [2022-11-19 08:12:11,934 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-19 08:12:11,934 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:12:11,935 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:12:11,935 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:12:11,935 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:12:12,049 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:12:14,745 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '14223#(and (<= 4 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_correct_version_#res#1| 1) (<= 4 |ULTIMATE.start_student_version_~w#1|) (<= |ULTIMATE.start_main_~is_divisible1~0#1| 1) (<= 4 |ULTIMATE.start_correct_version_~w#1|) (<= 4 |ULTIMATE.start_student_version_#in~w#1|) (<= 0 |ULTIMATE.start_correct_version_~is_divisible~0#1|) (= ~true~0 1) (<= |ULTIMATE.start_correct_version_~is_divisible~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 4 |ULTIMATE.start_correct_version_#in~w#1|) (not (< |ULTIMATE.start_student_version_~i~1#1| |ULTIMATE.start_student_version_~w#1|)) (= ~false~0 0) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (or (and (not (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start_student_version_~is_divisible~1#1| ~false~0)) (and (<= 1 |ULTIMATE.start_student_version_~is_divisible~1#1|) (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|) (<= |ULTIMATE.start_student_version_~is_divisible~1#1| 1))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~is_divisible1~0#1|) (= |ULTIMATE.start_student_version_~is_divisible~1#1| |ULTIMATE.start_student_version_#res#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (= |#NULL.base| 0))' at error location [2022-11-19 08:12:14,745 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:12:14,745 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:12:14,746 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 45] total 129 [2022-11-19 08:12:14,746 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1360896254] [2022-11-19 08:12:14,746 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:12:14,746 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 129 states [2022-11-19 08:12:14,746 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:12:14,747 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 129 interpolants. [2022-11-19 08:12:14,747 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=523, Invalid=18383, Unknown=0, NotChecked=0, Total=18906 [2022-11-19 08:12:14,747 INFO L87 Difference]: Start difference. First operand 47 states and 48 transitions. Second operand has 129 states, 129 states have (on average 1.0310077519379846) internal successors, (133), 129 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:12:28,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:12:28,223 INFO L93 Difference]: Finished difference Result 76 states and 79 transitions. [2022-11-19 08:12:28,223 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2022-11-19 08:12:28,223 INFO L78 Accepts]: Start accepts. Automaton has has 129 states, 129 states have (on average 1.0310077519379846) internal successors, (133), 129 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 46 [2022-11-19 08:12:28,223 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:12:28,224 INFO L225 Difference]: With dead ends: 76 [2022-11-19 08:12:28,224 INFO L226 Difference]: Without dead ends: 48 [2022-11-19 08:12:28,225 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 207 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 162 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7240 ImplicationChecksByTransitivity, 26.8s TimeCoverageRelationStatistics Valid=993, Invalid=25739, Unknown=0, NotChecked=0, Total=26732 [2022-11-19 08:12:28,226 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 239 mSDsluCounter, 180 mSDsCounter, 0 mSdLazyCounter, 4199 mSolverCounterSat, 85 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 239 SdHoareTripleChecker+Valid, 182 SdHoareTripleChecker+Invalid, 4284 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 85 IncrementalHoareTripleChecker+Valid, 4199 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.4s IncrementalHoareTripleChecker+Time [2022-11-19 08:12:28,226 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [239 Valid, 182 Invalid, 4284 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [85 Valid, 4199 Invalid, 0 Unknown, 0 Unchecked, 3.4s Time] [2022-11-19 08:12:28,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2022-11-19 08:12:28,272 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2022-11-19 08:12:28,272 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) [2022-11-19 08:12:28,272 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 49 transitions. [2022-11-19 08:12:28,272 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 49 transitions. Word has length 46 [2022-11-19 08:12:28,272 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:12:28,272 INFO L495 AbstractCegarLoop]: Abstraction has 48 states and 49 transitions. [2022-11-19 08:12:28,273 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 129 states, 129 states have (on average 1.0310077519379846) internal successors, (133), 129 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:12:28,273 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 49 transitions. [2022-11-19 08:12:28,273 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-11-19 08:12:28,273 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:12:28,273 INFO L195 NwaCegarLoop]: trace histogram [19, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:12:28,279 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Forceful destruction successful, exit code 0 [2022-11-19 08:12:28,473 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2022-11-19 08:12:28,474 INFO L420 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:12:28,474 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:12:28,474 INFO L85 PathProgramCache]: Analyzing trace with hash 1956267790, now seen corresponding path program 35 times [2022-11-19 08:12:28,474 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:12:28,474 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1560046668] [2022-11-19 08:12:28,475 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:12:28,475 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:12:28,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:12:30,355 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 153 proven. 208 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:12:30,355 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:12:30,355 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1560046668] [2022-11-19 08:12:30,355 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1560046668] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:12:30,355 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [689839733] [2022-11-19 08:12:30,355 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 08:12:30,356 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:12:30,356 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:12:30,356 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:12:30,359 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2022-11-19 08:12:30,426 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2022-11-19 08:12:30,426 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:12:30,427 INFO L263 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 44 conjunts are in the unsatisfiable core [2022-11-19 08:12:30,429 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:12:32,236 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 171 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:12:32,236 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:12:34,046 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 190 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:12:34,046 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [689839733] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:12:34,046 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1913065081] [2022-11-19 08:12:34,047 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-19 08:12:34,047 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:12:34,047 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:12:34,047 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:12:34,047 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:12:34,152 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:12:35,606 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '14893#(and (<= 4 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_correct_version_#res#1| 1) (<= 4 |ULTIMATE.start_student_version_~w#1|) (<= |ULTIMATE.start_main_~is_divisible1~0#1| 1) (<= 4 |ULTIMATE.start_correct_version_~w#1|) (<= 4 |ULTIMATE.start_student_version_#in~w#1|) (<= 0 |ULTIMATE.start_correct_version_~is_divisible~0#1|) (= ~true~0 1) (<= |ULTIMATE.start_correct_version_~is_divisible~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 4 |ULTIMATE.start_correct_version_#in~w#1|) (not (< |ULTIMATE.start_student_version_~i~1#1| |ULTIMATE.start_student_version_~w#1|)) (= ~false~0 0) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (or (and (not (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start_student_version_~is_divisible~1#1| ~false~0)) (and (<= 1 |ULTIMATE.start_student_version_~is_divisible~1#1|) (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|) (<= |ULTIMATE.start_student_version_~is_divisible~1#1| 1))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~is_divisible1~0#1|) (= |ULTIMATE.start_student_version_~is_divisible~1#1| |ULTIMATE.start_student_version_#res#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (= |#NULL.base| 0))' at error location [2022-11-19 08:12:35,606 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:12:35,606 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:12:35,607 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 43, 43] total 104 [2022-11-19 08:12:35,607 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1506468780] [2022-11-19 08:12:35,607 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:12:35,607 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 104 states [2022-11-19 08:12:35,607 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:12:35,608 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 104 interpolants. [2022-11-19 08:12:35,609 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2062, Invalid=10594, Unknown=0, NotChecked=0, Total=12656 [2022-11-19 08:12:35,609 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) [2022-11-19 08:12:37,227 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:12:37,227 INFO L93 Difference]: Finished difference Result 53 states and 54 transitions. [2022-11-19 08:12:37,228 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2022-11-19 08:12:37,228 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 [2022-11-19 08:12:37,228 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:12:37,229 INFO L225 Difference]: With dead ends: 53 [2022-11-19 08:12:37,229 INFO L226 Difference]: Without dead ends: 49 [2022-11-19 08:12:37,229 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 204 GetRequests, 51 SyntacticMatches, 21 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9434 ImplicationChecksByTransitivity, 7.1s TimeCoverageRelationStatistics Valid=3996, Invalid=13826, Unknown=0, NotChecked=0, Total=17822 [2022-11-19 08:12:37,230 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 272 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 493 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 272 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 501 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 493 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-19 08:12:37,230 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [272 Valid, 36 Invalid, 501 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 493 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-19 08:12:37,230 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2022-11-19 08:12:37,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2022-11-19 08:12:37,269 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) [2022-11-19 08:12:37,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 50 transitions. [2022-11-19 08:12:37,270 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 50 transitions. Word has length 47 [2022-11-19 08:12:37,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:12:37,270 INFO L495 AbstractCegarLoop]: Abstraction has 49 states and 50 transitions. [2022-11-19 08:12:37,270 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) [2022-11-19 08:12:37,270 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 50 transitions. [2022-11-19 08:12:37,271 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-11-19 08:12:37,271 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:12:37,271 INFO L195 NwaCegarLoop]: trace histogram [19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:12:37,279 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Ended with exit code 0 [2022-11-19 08:12:37,476 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:12:37,476 INFO L420 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:12:37,476 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:12:37,476 INFO L85 PathProgramCache]: Analyzing trace with hash 504858165, now seen corresponding path program 36 times [2022-11-19 08:12:37,477 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:12:37,477 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1158329126] [2022-11-19 08:12:37,477 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:12:37,477 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:12:37,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:12:40,296 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:12:40,296 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:12:40,296 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1158329126] [2022-11-19 08:12:40,296 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1158329126] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:12:40,296 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [187437948] [2022-11-19 08:12:40,296 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 08:12:40,296 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:12:40,297 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:12:40,297 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:12:40,301 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2022-11-19 08:12:40,359 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 08:12:40,359 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:12:40,361 WARN L261 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 112 conjunts are in the unsatisfiable core [2022-11-19 08:12:40,363 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:12:48,909 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:12:48,909 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:12:55,993 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:12:55,993 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [187437948] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:12:55,993 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1550190051] [2022-11-19 08:12:55,994 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-19 08:12:55,994 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:12:55,994 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:12:55,994 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:12:55,995 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:12:56,116 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:12:58,964 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15549#(and (<= 4 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_correct_version_#res#1| 1) (<= 4 |ULTIMATE.start_student_version_~w#1|) (<= |ULTIMATE.start_main_~is_divisible1~0#1| 1) (<= 4 |ULTIMATE.start_correct_version_~w#1|) (<= 4 |ULTIMATE.start_student_version_#in~w#1|) (<= 0 |ULTIMATE.start_correct_version_~is_divisible~0#1|) (= ~true~0 1) (<= |ULTIMATE.start_correct_version_~is_divisible~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 4 |ULTIMATE.start_correct_version_#in~w#1|) (not (< |ULTIMATE.start_student_version_~i~1#1| |ULTIMATE.start_student_version_~w#1|)) (= ~false~0 0) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (or (and (not (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start_student_version_~is_divisible~1#1| ~false~0)) (and (<= 1 |ULTIMATE.start_student_version_~is_divisible~1#1|) (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|) (<= |ULTIMATE.start_student_version_~is_divisible~1#1| 1))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~is_divisible1~0#1|) (= |ULTIMATE.start_student_version_~is_divisible~1#1| |ULTIMATE.start_student_version_#res#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (= |#NULL.base| 0))' at error location [2022-11-19 08:12:58,964 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:12:58,964 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:12:58,964 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 136 [2022-11-19 08:12:58,964 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1968640507] [2022-11-19 08:12:58,965 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:12:58,965 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 136 states [2022-11-19 08:12:58,965 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:12:58,966 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 136 interpolants. [2022-11-19 08:12:58,966 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=550, Invalid=20330, Unknown=0, NotChecked=0, Total=20880 [2022-11-19 08:12:58,967 INFO L87 Difference]: Start difference. First operand 49 states and 50 transitions. Second operand has 136 states, 136 states have (on average 1.0220588235294117) internal successors, (139), 136 states have internal predecessors, (139), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:13:11,655 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:13:11,655 INFO L93 Difference]: Finished difference Result 79 states and 82 transitions. [2022-11-19 08:13:11,656 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2022-11-19 08:13:11,656 INFO L78 Accepts]: Start accepts. Automaton has has 136 states, 136 states have (on average 1.0220588235294117) internal successors, (139), 136 states have internal predecessors, (139), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 48 [2022-11-19 08:13:11,656 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:13:11,656 INFO L225 Difference]: With dead ends: 79 [2022-11-19 08:13:11,656 INFO L226 Difference]: Without dead ends: 50 [2022-11-19 08:13:11,658 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 214 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 168 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7906 ImplicationChecksByTransitivity, 27.4s TimeCoverageRelationStatistics Valid=930, Invalid=27800, Unknown=0, NotChecked=0, Total=28730 [2022-11-19 08:13:11,658 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 218 mSDsluCounter, 171 mSDsCounter, 0 mSdLazyCounter, 4253 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 218 SdHoareTripleChecker+Valid, 173 SdHoareTripleChecker+Invalid, 4261 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 4253 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.4s IncrementalHoareTripleChecker+Time [2022-11-19 08:13:11,658 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [218 Valid, 173 Invalid, 4261 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 4253 Invalid, 0 Unknown, 0 Unchecked, 3.4s Time] [2022-11-19 08:13:11,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2022-11-19 08:13:11,698 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2022-11-19 08:13:11,698 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) [2022-11-19 08:13:11,698 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 51 transitions. [2022-11-19 08:13:11,698 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 51 transitions. Word has length 48 [2022-11-19 08:13:11,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:13:11,699 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 51 transitions. [2022-11-19 08:13:11,699 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 136 states, 136 states have (on average 1.0220588235294117) internal successors, (139), 136 states have internal predecessors, (139), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:13:11,699 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 51 transitions. [2022-11-19 08:13:11,699 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-11-19 08:13:11,699 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:13:11,700 INFO L195 NwaCegarLoop]: trace histogram [20, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:13:11,711 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Forceful destruction successful, exit code 0 [2022-11-19 08:13:11,904 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable41 [2022-11-19 08:13:11,905 INFO L420 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:13:11,905 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:13:11,905 INFO L85 PathProgramCache]: Analyzing trace with hash 1371380721, now seen corresponding path program 37 times [2022-11-19 08:13:11,905 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:13:11,905 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1148185793] [2022-11-19 08:13:11,905 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:13:11,906 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:13:11,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:13:13,727 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 171 proven. 229 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:13:13,727 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:13:13,727 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1148185793] [2022-11-19 08:13:13,727 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1148185793] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:13:13,728 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [190073311] [2022-11-19 08:13:13,728 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 08:13:13,728 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:13:13,728 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:13:13,729 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:13:13,743 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2022-11-19 08:13:13,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:13:13,796 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 46 conjunts are in the unsatisfiable core [2022-11-19 08:13:13,798 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:13:15,736 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 190 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:13:15,736 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:13:17,698 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 210 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:13:17,699 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [190073311] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:13:17,699 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1624185944] [2022-11-19 08:13:17,700 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-19 08:13:17,700 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:13:17,700 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:13:17,700 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:13:17,701 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:13:17,827 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:13:19,308 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16244#(and (<= 4 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_correct_version_#res#1| 1) (<= 4 |ULTIMATE.start_student_version_~w#1|) (<= |ULTIMATE.start_main_~is_divisible1~0#1| 1) (<= 4 |ULTIMATE.start_correct_version_~w#1|) (<= 4 |ULTIMATE.start_student_version_#in~w#1|) (<= 0 |ULTIMATE.start_correct_version_~is_divisible~0#1|) (= ~true~0 1) (<= |ULTIMATE.start_correct_version_~is_divisible~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 4 |ULTIMATE.start_correct_version_#in~w#1|) (not (< |ULTIMATE.start_student_version_~i~1#1| |ULTIMATE.start_student_version_~w#1|)) (= ~false~0 0) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (or (and (not (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start_student_version_~is_divisible~1#1| ~false~0)) (and (<= 1 |ULTIMATE.start_student_version_~is_divisible~1#1|) (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|) (<= |ULTIMATE.start_student_version_~is_divisible~1#1| 1))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~is_divisible1~0#1|) (= |ULTIMATE.start_student_version_~is_divisible~1#1| |ULTIMATE.start_student_version_#res#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (= |#NULL.base| 0))' at error location [2022-11-19 08:13:19,308 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:13:19,308 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:13:19,308 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 45, 45] total 109 [2022-11-19 08:13:19,309 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1817872219] [2022-11-19 08:13:19,309 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:13:19,309 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 109 states [2022-11-19 08:13:19,309 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:13:19,310 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 109 interpolants. [2022-11-19 08:13:19,311 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2258, Invalid=11548, Unknown=0, NotChecked=0, Total=13806 [2022-11-19 08:13:19,311 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) [2022-11-19 08:13:20,854 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:13:20,854 INFO L93 Difference]: Finished difference Result 55 states and 56 transitions. [2022-11-19 08:13:20,855 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2022-11-19 08:13:20,855 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 [2022-11-19 08:13:20,855 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:13:20,855 INFO L225 Difference]: With dead ends: 55 [2022-11-19 08:13:20,856 INFO L226 Difference]: Without dead ends: 51 [2022-11-19 08:13:20,857 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 213 GetRequests, 53 SyntacticMatches, 22 SemanticMatches, 138 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10337 ImplicationChecksByTransitivity, 7.4s TimeCoverageRelationStatistics Valid=4383, Invalid=15077, Unknown=0, NotChecked=0, Total=19460 [2022-11-19 08:13:20,857 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 282 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 238 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 282 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 251 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 238 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-19 08:13:20,857 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [282 Valid, 9 Invalid, 251 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 238 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-19 08:13:20,858 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2022-11-19 08:13:20,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2022-11-19 08:13:20,900 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) [2022-11-19 08:13:20,900 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2022-11-19 08:13:20,900 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 49 [2022-11-19 08:13:20,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:13:20,901 INFO L495 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2022-11-19 08:13:20,901 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) [2022-11-19 08:13:20,901 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2022-11-19 08:13:20,901 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-11-19 08:13:20,902 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:13:20,902 INFO L195 NwaCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:13:20,906 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Forceful destruction successful, exit code 0 [2022-11-19 08:13:21,103 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable42 [2022-11-19 08:13:21,103 INFO L420 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:13:21,103 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:13:21,103 INFO L85 PathProgramCache]: Analyzing trace with hash -446771790, now seen corresponding path program 38 times [2022-11-19 08:13:21,104 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:13:21,104 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [824737591] [2022-11-19 08:13:21,104 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:13:21,104 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:13:21,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:13:23,977 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:13:23,977 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:13:23,977 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [824737591] [2022-11-19 08:13:23,977 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [824737591] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:13:23,977 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [51568965] [2022-11-19 08:13:23,977 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 08:13:23,978 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:13:23,978 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:13:23,978 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:13:23,981 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2022-11-19 08:13:24,050 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2022-11-19 08:13:24,050 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:13:24,053 WARN L261 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 116 conjunts are in the unsatisfiable core [2022-11-19 08:13:24,055 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:13:34,080 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:13:34,080 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:13:41,787 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:13:41,787 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [51568965] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:13:41,787 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [120416907] [2022-11-19 08:13:41,788 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-19 08:13:41,788 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:13:41,789 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:13:41,789 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:13:41,789 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:13:41,908 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:13:44,799 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16928#(and (<= 4 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_correct_version_#res#1| 1) (<= 4 |ULTIMATE.start_student_version_~w#1|) (<= |ULTIMATE.start_main_~is_divisible1~0#1| 1) (<= 4 |ULTIMATE.start_correct_version_~w#1|) (<= 4 |ULTIMATE.start_student_version_#in~w#1|) (<= 0 |ULTIMATE.start_correct_version_~is_divisible~0#1|) (= ~true~0 1) (<= |ULTIMATE.start_correct_version_~is_divisible~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 4 |ULTIMATE.start_correct_version_#in~w#1|) (not (< |ULTIMATE.start_student_version_~i~1#1| |ULTIMATE.start_student_version_~w#1|)) (= ~false~0 0) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (or (and (not (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start_student_version_~is_divisible~1#1| ~false~0)) (and (<= 1 |ULTIMATE.start_student_version_~is_divisible~1#1|) (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|) (<= |ULTIMATE.start_student_version_~is_divisible~1#1| 1))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~is_divisible1~0#1|) (= |ULTIMATE.start_student_version_~is_divisible~1#1| |ULTIMATE.start_student_version_#res#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (= |#NULL.base| 0))' at error location [2022-11-19 08:13:44,799 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:13:44,799 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:13:44,799 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 142 [2022-11-19 08:13:44,799 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [377918663] [2022-11-19 08:13:44,799 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:13:44,799 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 142 states [2022-11-19 08:13:44,799 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:13:44,800 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 142 interpolants. [2022-11-19 08:13:44,801 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=574, Invalid=22076, Unknown=0, NotChecked=0, Total=22650 [2022-11-19 08:13:44,801 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand has 142 states, 142 states have (on average 1.0211267605633803) internal successors, (145), 142 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) [2022-11-19 08:13:57,839 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:13:57,839 INFO L93 Difference]: Finished difference Result 82 states and 85 transitions. [2022-11-19 08:13:57,840 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2022-11-19 08:13:57,840 INFO L78 Accepts]: Start accepts. Automaton has has 142 states, 142 states have (on average 1.0211267605633803) internal successors, (145), 142 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 50 [2022-11-19 08:13:57,840 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:13:57,840 INFO L225 Difference]: With dead ends: 82 [2022-11-19 08:13:57,840 INFO L226 Difference]: Without dead ends: 52 [2022-11-19 08:13:57,842 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 223 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 175 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8589 ImplicationChecksByTransitivity, 29.5s TimeCoverageRelationStatistics Valid=970, Invalid=30182, Unknown=0, NotChecked=0, Total=31152 [2022-11-19 08:13:57,842 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 223 mSDsluCounter, 186 mSDsCounter, 0 mSdLazyCounter, 4694 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 223 SdHoareTripleChecker+Valid, 188 SdHoareTripleChecker+Invalid, 4702 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 4694 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.6s IncrementalHoareTripleChecker+Time [2022-11-19 08:13:57,842 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [223 Valid, 188 Invalid, 4702 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 4694 Invalid, 0 Unknown, 0 Unchecked, 3.6s Time] [2022-11-19 08:13:57,843 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2022-11-19 08:13:57,898 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2022-11-19 08:13:57,898 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 51 states have (on average 1.0392156862745099) internal successors, (53), 51 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:13:57,898 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 53 transitions. [2022-11-19 08:13:57,899 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 53 transitions. Word has length 50 [2022-11-19 08:13:57,899 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:13:57,899 INFO L495 AbstractCegarLoop]: Abstraction has 52 states and 53 transitions. [2022-11-19 08:13:57,899 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 142 states, 142 states have (on average 1.0211267605633803) internal successors, (145), 142 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) [2022-11-19 08:13:57,899 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 53 transitions. [2022-11-19 08:13:57,899 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2022-11-19 08:13:57,899 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:13:57,899 INFO L195 NwaCegarLoop]: trace histogram [21, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:13:57,907 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Forceful destruction successful, exit code 0 [2022-11-19 08:13:58,100 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable43 [2022-11-19 08:13:58,100 INFO L420 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:13:58,100 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:13:58,100 INFO L85 PathProgramCache]: Analyzing trace with hash -942250898, now seen corresponding path program 39 times [2022-11-19 08:13:58,101 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:13:58,101 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [133276832] [2022-11-19 08:13:58,101 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:13:58,101 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:13:58,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:14:00,043 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 190 proven. 251 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:14:00,043 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:14:00,043 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [133276832] [2022-11-19 08:14:00,043 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [133276832] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:14:00,043 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1930325467] [2022-11-19 08:14:00,043 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 08:14:00,043 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:14:00,044 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:14:00,044 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:14:00,048 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2022-11-19 08:14:00,112 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 08:14:00,112 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:14:00,114 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 48 conjunts are in the unsatisfiable core [2022-11-19 08:14:00,116 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:14:02,204 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 210 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:14:02,204 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:14:04,314 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 231 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:14:04,314 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1930325467] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:14:04,314 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1728615551] [2022-11-19 08:14:04,315 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-19 08:14:04,315 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:14:04,315 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:14:04,315 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:14:04,315 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:14:04,424 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:14:05,924 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '17652#(and (<= 4 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_correct_version_#res#1| 1) (<= 4 |ULTIMATE.start_student_version_~w#1|) (<= |ULTIMATE.start_main_~is_divisible1~0#1| 1) (<= 4 |ULTIMATE.start_correct_version_~w#1|) (<= 4 |ULTIMATE.start_student_version_#in~w#1|) (<= 0 |ULTIMATE.start_correct_version_~is_divisible~0#1|) (= ~true~0 1) (<= |ULTIMATE.start_correct_version_~is_divisible~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 4 |ULTIMATE.start_correct_version_#in~w#1|) (not (< |ULTIMATE.start_student_version_~i~1#1| |ULTIMATE.start_student_version_~w#1|)) (= ~false~0 0) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (or (and (not (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start_student_version_~is_divisible~1#1| ~false~0)) (and (<= 1 |ULTIMATE.start_student_version_~is_divisible~1#1|) (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|) (<= |ULTIMATE.start_student_version_~is_divisible~1#1| 1))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~is_divisible1~0#1|) (= |ULTIMATE.start_student_version_~is_divisible~1#1| |ULTIMATE.start_student_version_#res#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (= |#NULL.base| 0))' at error location [2022-11-19 08:14:05,924 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:14:05,924 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:14:05,924 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 47, 47] total 114 [2022-11-19 08:14:05,924 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1246842866] [2022-11-19 08:14:05,924 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:14:05,925 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 114 states [2022-11-19 08:14:05,925 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:14:05,925 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 114 interpolants. [2022-11-19 08:14:05,926 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2463, Invalid=12543, Unknown=0, NotChecked=0, Total=15006 [2022-11-19 08:14:05,926 INFO L87 Difference]: Start difference. First operand 52 states and 53 transitions. Second operand has 114 states, 114 states have (on average 1.0701754385964912) internal successors, (122), 114 states have internal predecessors, (122), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:14:07,632 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:14:07,632 INFO L93 Difference]: Finished difference Result 57 states and 58 transitions. [2022-11-19 08:14:07,633 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2022-11-19 08:14:07,633 INFO L78 Accepts]: Start accepts. Automaton has has 114 states, 114 states have (on average 1.0701754385964912) internal successors, (122), 114 states have internal predecessors, (122), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 51 [2022-11-19 08:14:07,633 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:14:07,633 INFO L225 Difference]: With dead ends: 57 [2022-11-19 08:14:07,633 INFO L226 Difference]: Without dead ends: 53 [2022-11-19 08:14:07,634 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 222 GetRequests, 55 SyntacticMatches, 23 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11281 ImplicationChecksByTransitivity, 7.9s TimeCoverageRelationStatistics Valid=4788, Invalid=16382, Unknown=0, NotChecked=0, Total=21170 [2022-11-19 08:14:07,635 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 290 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 403 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 290 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 409 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 403 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-19 08:14:07,635 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [290 Valid, 21 Invalid, 409 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 403 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-19 08:14:07,635 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2022-11-19 08:14:07,681 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2022-11-19 08:14:07,682 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) [2022-11-19 08:14:07,682 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 54 transitions. [2022-11-19 08:14:07,682 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 54 transitions. Word has length 51 [2022-11-19 08:14:07,682 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:14:07,682 INFO L495 AbstractCegarLoop]: Abstraction has 53 states and 54 transitions. [2022-11-19 08:14:07,682 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 114 states, 114 states have (on average 1.0701754385964912) internal successors, (122), 114 states have internal predecessors, (122), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:14:07,682 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 54 transitions. [2022-11-19 08:14:07,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2022-11-19 08:14:07,683 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:14:07,683 INFO L195 NwaCegarLoop]: trace histogram [21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:14:07,687 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Forceful destruction successful, exit code 0 [2022-11-19 08:14:07,883 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44,42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:14:07,883 INFO L420 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:14:07,884 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:14:07,884 INFO L85 PathProgramCache]: Analyzing trace with hash 845092053, now seen corresponding path program 40 times [2022-11-19 08:14:07,884 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:14:07,884 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [494954610] [2022-11-19 08:14:07,884 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:14:07,884 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:14:07,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:14:10,921 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 462 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:14:10,921 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:14:10,921 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [494954610] [2022-11-19 08:14:10,921 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [494954610] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:14:10,921 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [862314655] [2022-11-19 08:14:10,921 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 08:14:10,921 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:14:10,921 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:14:10,922 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:14:10,924 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2022-11-19 08:14:10,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:14:10,981 WARN L261 TraceCheckSpWp]: Trace formula consists of 202 conjuncts, 118 conjunts are in the unsatisfiable core [2022-11-19 08:14:10,983 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:14:21,659 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 462 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:14:21,659 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:14:29,236 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 462 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:14:29,236 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [862314655] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:14:29,236 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [496904634] [2022-11-19 08:14:29,237 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-19 08:14:29,237 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:14:29,238 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:14:29,238 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:14:29,238 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:14:29,360 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:14:32,317 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '18363#(and (<= 4 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_correct_version_#res#1| 1) (<= 4 |ULTIMATE.start_student_version_~w#1|) (<= |ULTIMATE.start_main_~is_divisible1~0#1| 1) (<= 4 |ULTIMATE.start_correct_version_~w#1|) (<= 4 |ULTIMATE.start_student_version_#in~w#1|) (<= 0 |ULTIMATE.start_correct_version_~is_divisible~0#1|) (= ~true~0 1) (<= |ULTIMATE.start_correct_version_~is_divisible~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 4 |ULTIMATE.start_correct_version_#in~w#1|) (not (< |ULTIMATE.start_student_version_~i~1#1| |ULTIMATE.start_student_version_~w#1|)) (= ~false~0 0) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (or (and (not (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start_student_version_~is_divisible~1#1| ~false~0)) (and (<= 1 |ULTIMATE.start_student_version_~is_divisible~1#1|) (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|) (<= |ULTIMATE.start_student_version_~is_divisible~1#1| 1))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~is_divisible1~0#1|) (= |ULTIMATE.start_student_version_~is_divisible~1#1| |ULTIMATE.start_student_version_#res#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (= |#NULL.base| 0))' at error location [2022-11-19 08:14:32,317 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:14:32,317 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:14:32,317 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 147 [2022-11-19 08:14:32,318 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [109806931] [2022-11-19 08:14:32,318 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:14:32,318 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 147 states [2022-11-19 08:14:32,318 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:14:32,319 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 147 interpolants. [2022-11-19 08:14:32,320 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=595, Invalid=23585, Unknown=0, NotChecked=0, Total=24180 [2022-11-19 08:14:32,320 INFO L87 Difference]: Start difference. First operand 53 states and 54 transitions. Second operand has 147 states, 147 states have (on average 1.0272108843537415) internal successors, (151), 147 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:14:48,684 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:14:48,684 INFO L93 Difference]: Finished difference Result 85 states and 88 transitions. [2022-11-19 08:14:48,684 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2022-11-19 08:14:48,685 INFO L78 Accepts]: Start accepts. Automaton has has 147 states, 147 states have (on average 1.0272108843537415) internal successors, (151), 147 states have internal predecessors, (151), 0 states have call successors, (0), 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 [2022-11-19 08:14:48,685 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:14:48,685 INFO L225 Difference]: With dead ends: 85 [2022-11-19 08:14:48,685 INFO L226 Difference]: Without dead ends: 54 [2022-11-19 08:14:48,687 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 234 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 183 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9289 ImplicationChecksByTransitivity, 33.4s TimeCoverageRelationStatistics Valid=1125, Invalid=32915, Unknown=0, NotChecked=0, Total=34040 [2022-11-19 08:14:48,687 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 317 mSDsluCounter, 168 mSDsCounter, 0 mSdLazyCounter, 5082 mSolverCounterSat, 96 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 317 SdHoareTripleChecker+Valid, 170 SdHoareTripleChecker+Invalid, 5178 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 96 IncrementalHoareTripleChecker+Valid, 5082 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.0s IncrementalHoareTripleChecker+Time [2022-11-19 08:14:48,687 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [317 Valid, 170 Invalid, 5178 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [96 Valid, 5082 Invalid, 0 Unknown, 0 Unchecked, 4.0s Time] [2022-11-19 08:14:48,688 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2022-11-19 08:14:48,748 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2022-11-19 08:14:48,748 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) [2022-11-19 08:14:48,750 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 55 transitions. [2022-11-19 08:14:48,750 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 55 transitions. Word has length 52 [2022-11-19 08:14:48,750 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:14:48,750 INFO L495 AbstractCegarLoop]: Abstraction has 54 states and 55 transitions. [2022-11-19 08:14:48,750 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 147 states, 147 states have (on average 1.0272108843537415) internal successors, (151), 147 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:14:48,750 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 55 transitions. [2022-11-19 08:14:48,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2022-11-19 08:14:48,751 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:14:48,751 INFO L195 NwaCegarLoop]: trace histogram [22, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:14:48,756 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Ended with exit code 0 [2022-11-19 08:14:48,951 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable45 [2022-11-19 08:14:48,951 INFO L420 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:14:48,952 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:14:48,952 INFO L85 PathProgramCache]: Analyzing trace with hash 1431039121, now seen corresponding path program 41 times [2022-11-19 08:14:48,952 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:14:48,952 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1264807534] [2022-11-19 08:14:48,952 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:14:48,952 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:14:48,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:14:50,992 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 210 proven. 274 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:14:50,992 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:14:50,992 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1264807534] [2022-11-19 08:14:50,992 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1264807534] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:14:50,993 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2038230538] [2022-11-19 08:14:50,993 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 08:14:50,993 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:14:50,993 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:14:50,994 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:14:50,996 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2022-11-19 08:14:51,072 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2022-11-19 08:14:51,072 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:14:51,074 INFO L263 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 50 conjunts are in the unsatisfiable core [2022-11-19 08:14:51,076 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:14:53,319 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 231 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:14:53,319 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:14:55,594 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 253 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:14:55,594 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2038230538] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:14:55,594 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1398591280] [2022-11-19 08:14:55,595 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-19 08:14:55,595 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:14:55,595 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:14:55,595 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:14:55,596 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:14:55,708 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:14:57,231 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '19120#(and (<= 4 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_correct_version_#res#1| 1) (<= 4 |ULTIMATE.start_student_version_~w#1|) (<= |ULTIMATE.start_main_~is_divisible1~0#1| 1) (<= 4 |ULTIMATE.start_correct_version_~w#1|) (<= 4 |ULTIMATE.start_student_version_#in~w#1|) (<= 0 |ULTIMATE.start_correct_version_~is_divisible~0#1|) (= ~true~0 1) (<= |ULTIMATE.start_correct_version_~is_divisible~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 4 |ULTIMATE.start_correct_version_#in~w#1|) (not (< |ULTIMATE.start_student_version_~i~1#1| |ULTIMATE.start_student_version_~w#1|)) (= ~false~0 0) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (or (and (not (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start_student_version_~is_divisible~1#1| ~false~0)) (and (<= 1 |ULTIMATE.start_student_version_~is_divisible~1#1|) (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|) (<= |ULTIMATE.start_student_version_~is_divisible~1#1| 1))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~is_divisible1~0#1|) (= |ULTIMATE.start_student_version_~is_divisible~1#1| |ULTIMATE.start_student_version_#res#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (= |#NULL.base| 0))' at error location [2022-11-19 08:14:57,231 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:14:57,231 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:14:57,231 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 49, 49] total 119 [2022-11-19 08:14:57,231 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1866184073] [2022-11-19 08:14:57,231 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:14:57,232 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 119 states [2022-11-19 08:14:57,232 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:14:57,233 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 119 interpolants. [2022-11-19 08:14:57,234 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2677, Invalid=13579, Unknown=0, NotChecked=0, Total=16256 [2022-11-19 08:14:57,234 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) [2022-11-19 08:14:59,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:14:59,095 INFO L93 Difference]: Finished difference Result 59 states and 60 transitions. [2022-11-19 08:14:59,095 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2022-11-19 08:14:59,095 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 [2022-11-19 08:14:59,096 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:14:59,096 INFO L225 Difference]: With dead ends: 59 [2022-11-19 08:14:59,096 INFO L226 Difference]: Without dead ends: 55 [2022-11-19 08:14:59,097 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 57 SyntacticMatches, 24 SemanticMatches, 150 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12266 ImplicationChecksByTransitivity, 8.5s TimeCoverageRelationStatistics Valid=5211, Invalid=17741, Unknown=0, NotChecked=0, Total=22952 [2022-11-19 08:14:59,097 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 301 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 479 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 301 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 485 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 479 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-19 08:14:59,098 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [301 Valid, 30 Invalid, 485 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 479 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-19 08:14:59,098 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2022-11-19 08:14:59,148 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2022-11-19 08:14:59,148 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) [2022-11-19 08:14:59,148 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 56 transitions. [2022-11-19 08:14:59,149 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 56 transitions. Word has length 53 [2022-11-19 08:14:59,149 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:14:59,149 INFO L495 AbstractCegarLoop]: Abstraction has 55 states and 56 transitions. [2022-11-19 08:14:59,149 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) [2022-11-19 08:14:59,149 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 56 transitions. [2022-11-19 08:14:59,150 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2022-11-19 08:14:59,150 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:14:59,150 INFO L195 NwaCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:14:59,154 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Forceful destruction successful, exit code 0 [2022-11-19 08:14:59,350 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable46 [2022-11-19 08:14:59,350 INFO L420 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:14:59,351 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:14:59,351 INFO L85 PathProgramCache]: Analyzing trace with hash 1402638610, now seen corresponding path program 42 times [2022-11-19 08:14:59,351 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:14:59,351 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1031611455] [2022-11-19 08:14:59,351 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:14:59,351 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:14:59,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:15:02,592 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:15:02,592 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:15:02,592 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1031611455] [2022-11-19 08:15:02,592 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1031611455] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:15:02,592 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1471629159] [2022-11-19 08:15:02,592 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 08:15:02,592 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:15:02,592 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:15:02,593 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:15:02,599 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2022-11-19 08:15:02,656 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 08:15:02,656 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:15:02,659 WARN L261 TraceCheckSpWp]: Trace formula consists of 208 conjuncts, 124 conjunts are in the unsatisfiable core [2022-11-19 08:15:02,660 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:15:14,164 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:15:14,165 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:15:23,095 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:15:23,095 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1471629159] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:15:23,095 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1947111796] [2022-11-19 08:15:23,096 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-19 08:15:23,096 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:15:23,096 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:15:23,097 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:15:23,097 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:15:23,220 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:15:26,281 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '19860#(and (<= 4 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_correct_version_#res#1| 1) (<= 4 |ULTIMATE.start_student_version_~w#1|) (<= |ULTIMATE.start_main_~is_divisible1~0#1| 1) (<= 4 |ULTIMATE.start_correct_version_~w#1|) (<= 4 |ULTIMATE.start_student_version_#in~w#1|) (<= 0 |ULTIMATE.start_correct_version_~is_divisible~0#1|) (= ~true~0 1) (<= |ULTIMATE.start_correct_version_~is_divisible~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 4 |ULTIMATE.start_correct_version_#in~w#1|) (not (< |ULTIMATE.start_student_version_~i~1#1| |ULTIMATE.start_student_version_~w#1|)) (= ~false~0 0) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (or (and (not (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start_student_version_~is_divisible~1#1| ~false~0)) (and (<= 1 |ULTIMATE.start_student_version_~is_divisible~1#1|) (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|) (<= |ULTIMATE.start_student_version_~is_divisible~1#1| 1))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~is_divisible1~0#1|) (= |ULTIMATE.start_student_version_~is_divisible~1#1| |ULTIMATE.start_student_version_#res#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (= |#NULL.base| 0))' at error location [2022-11-19 08:15:26,281 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:15:26,281 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:15:26,282 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 154 [2022-11-19 08:15:26,282 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1287096201] [2022-11-19 08:15:26,282 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:15:26,282 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 154 states [2022-11-19 08:15:26,282 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:15:26,283 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 154 interpolants. [2022-11-19 08:15:26,285 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=622, Invalid=25784, Unknown=0, NotChecked=0, Total=26406 [2022-11-19 08:15:26,285 INFO L87 Difference]: Start difference. First operand 55 states and 56 transitions. Second operand has 154 states, 154 states have (on average 1.0194805194805194) internal successors, (157), 154 states have internal predecessors, (157), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:15:42,004 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:15:42,005 INFO L93 Difference]: Finished difference Result 88 states and 91 transitions. [2022-11-19 08:15:42,005 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2022-11-19 08:15:42,005 INFO L78 Accepts]: Start accepts. Automaton has has 154 states, 154 states have (on average 1.0194805194805194) internal successors, (157), 154 states have internal predecessors, (157), 0 states have call successors, (0), 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 [2022-11-19 08:15:42,005 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:15:42,006 INFO L225 Difference]: With dead ends: 88 [2022-11-19 08:15:42,006 INFO L226 Difference]: Without dead ends: 56 [2022-11-19 08:15:42,008 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 241 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 189 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10039 ImplicationChecksByTransitivity, 34.3s TimeCoverageRelationStatistics Valid=1050, Invalid=35240, Unknown=0, NotChecked=0, Total=36290 [2022-11-19 08:15:42,009 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 224 mSDsluCounter, 213 mSDsCounter, 0 mSdLazyCounter, 5734 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 224 SdHoareTripleChecker+Valid, 215 SdHoareTripleChecker+Invalid, 5742 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 5734 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.5s IncrementalHoareTripleChecker+Time [2022-11-19 08:15:42,009 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [224 Valid, 215 Invalid, 5742 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 5734 Invalid, 0 Unknown, 0 Unchecked, 4.5s Time] [2022-11-19 08:15:42,009 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2022-11-19 08:15:42,068 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2022-11-19 08:15:42,068 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 55 states have (on average 1.0363636363636364) internal successors, (57), 55 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) [2022-11-19 08:15:42,068 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 57 transitions. [2022-11-19 08:15:42,069 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 57 transitions. Word has length 54 [2022-11-19 08:15:42,069 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:15:42,069 INFO L495 AbstractCegarLoop]: Abstraction has 56 states and 57 transitions. [2022-11-19 08:15:42,069 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 154 states, 154 states have (on average 1.0194805194805194) internal successors, (157), 154 states have internal predecessors, (157), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:15:42,069 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 57 transitions. [2022-11-19 08:15:42,070 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-11-19 08:15:42,070 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:15:42,070 INFO L195 NwaCegarLoop]: trace histogram [23, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:15:42,077 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Forceful destruction successful, exit code 0 [2022-11-19 08:15:42,270 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2022-11-19 08:15:42,270 INFO L420 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:15:42,270 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:15:42,271 INFO L85 PathProgramCache]: Analyzing trace with hash 1857055182, now seen corresponding path program 43 times [2022-11-19 08:15:42,271 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:15:42,271 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [781655415] [2022-11-19 08:15:42,271 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:15:42,271 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:15:42,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:15:44,462 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 231 proven. 298 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:15:44,462 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:15:44,463 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [781655415] [2022-11-19 08:15:44,463 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [781655415] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:15:44,463 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [957517413] [2022-11-19 08:15:44,463 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 08:15:44,463 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:15:44,463 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:15:44,464 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:15:44,466 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2022-11-19 08:15:44,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:15:44,521 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 52 conjunts are in the unsatisfiable core [2022-11-19 08:15:44,523 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:15:46,955 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 253 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:15:46,955 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:15:49,388 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 276 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:15:49,388 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [957517413] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:15:49,388 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1779811473] [2022-11-19 08:15:49,389 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-19 08:15:49,389 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:15:49,389 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:15:49,390 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:15:49,390 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:15:49,500 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:15:51,062 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '20642#(and (<= 4 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_correct_version_#res#1| 1) (<= 4 |ULTIMATE.start_student_version_~w#1|) (<= |ULTIMATE.start_main_~is_divisible1~0#1| 1) (<= 4 |ULTIMATE.start_correct_version_~w#1|) (<= 4 |ULTIMATE.start_student_version_#in~w#1|) (<= 0 |ULTIMATE.start_correct_version_~is_divisible~0#1|) (= ~true~0 1) (<= |ULTIMATE.start_correct_version_~is_divisible~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 4 |ULTIMATE.start_correct_version_#in~w#1|) (not (< |ULTIMATE.start_student_version_~i~1#1| |ULTIMATE.start_student_version_~w#1|)) (= ~false~0 0) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (or (and (not (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start_student_version_~is_divisible~1#1| ~false~0)) (and (<= 1 |ULTIMATE.start_student_version_~is_divisible~1#1|) (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|) (<= |ULTIMATE.start_student_version_~is_divisible~1#1| 1))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~is_divisible1~0#1|) (= |ULTIMATE.start_student_version_~is_divisible~1#1| |ULTIMATE.start_student_version_#res#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (= |#NULL.base| 0))' at error location [2022-11-19 08:15:51,062 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:15:51,062 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:15:51,062 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 51, 51] total 124 [2022-11-19 08:15:51,063 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [405113147] [2022-11-19 08:15:51,063 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:15:51,063 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 124 states [2022-11-19 08:15:51,063 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:15:51,064 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 124 interpolants. [2022-11-19 08:15:51,065 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2900, Invalid=14656, Unknown=0, NotChecked=0, Total=17556 [2022-11-19 08:15:51,065 INFO L87 Difference]: Start difference. First operand 56 states and 57 transitions. Second operand has 124 states, 124 states have (on average 1.064516129032258) internal successors, (132), 124 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:15:52,961 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:15:52,961 INFO L93 Difference]: Finished difference Result 61 states and 62 transitions. [2022-11-19 08:15:52,962 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2022-11-19 08:15:52,962 INFO L78 Accepts]: Start accepts. Automaton has has 124 states, 124 states have (on average 1.064516129032258) internal successors, (132), 124 states have internal predecessors, (132), 0 states have call successors, (0), 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 55 [2022-11-19 08:15:52,962 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:15:52,962 INFO L225 Difference]: With dead ends: 61 [2022-11-19 08:15:52,963 INFO L226 Difference]: Without dead ends: 57 [2022-11-19 08:15:52,964 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 59 SyntacticMatches, 25 SemanticMatches, 156 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13292 ImplicationChecksByTransitivity, 9.0s TimeCoverageRelationStatistics Valid=5652, Invalid=19154, Unknown=0, NotChecked=0, Total=24806 [2022-11-19 08:15:52,964 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 248 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 366 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 248 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 375 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 366 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-19 08:15:52,964 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [248 Valid, 15 Invalid, 375 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 366 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-19 08:15:52,965 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2022-11-19 08:15:53,027 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2022-11-19 08:15:53,027 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) [2022-11-19 08:15:53,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 58 transitions. [2022-11-19 08:15:53,027 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 58 transitions. Word has length 55 [2022-11-19 08:15:53,027 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:15:53,027 INFO L495 AbstractCegarLoop]: Abstraction has 57 states and 58 transitions. [2022-11-19 08:15:53,027 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 124 states, 124 states have (on average 1.064516129032258) internal successors, (132), 124 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:15:53,028 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 58 transitions. [2022-11-19 08:15:53,028 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2022-11-19 08:15:53,028 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:15:53,028 INFO L195 NwaCegarLoop]: trace histogram [23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:15:53,035 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Forceful destruction successful, exit code 0 [2022-11-19 08:15:53,228 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48,46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:15:53,229 INFO L420 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:15:53,229 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:15:53,229 INFO L85 PathProgramCache]: Analyzing trace with hash 1724234613, now seen corresponding path program 44 times [2022-11-19 08:15:53,229 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:15:53,229 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [81798012] [2022-11-19 08:15:53,229 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:15:53,229 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:15:53,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:15:56,715 INFO L134 CoverageAnalysis]: Checked inductivity of 552 backedges. 0 proven. 552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:15:56,715 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:15:56,715 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [81798012] [2022-11-19 08:15:56,716 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [81798012] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:15:56,716 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [279982905] [2022-11-19 08:15:56,716 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 08:15:56,716 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:15:56,716 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:15:56,717 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:15:56,722 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2022-11-19 08:15:56,794 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2022-11-19 08:15:56,794 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:15:56,797 WARN L261 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 128 conjunts are in the unsatisfiable core [2022-11-19 08:15:56,798 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:16:09,313 INFO L134 CoverageAnalysis]: Checked inductivity of 552 backedges. 0 proven. 552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:16:09,313 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:16:19,056 INFO L134 CoverageAnalysis]: Checked inductivity of 552 backedges. 0 proven. 552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:16:19,056 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [279982905] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:16:19,056 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [873371135] [2022-11-19 08:16:19,057 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-19 08:16:19,057 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:16:19,057 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:16:19,058 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:16:19,058 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:16:19,171 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:16:22,344 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '21410#(and (<= 4 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_correct_version_#res#1| 1) (<= 4 |ULTIMATE.start_student_version_~w#1|) (<= |ULTIMATE.start_main_~is_divisible1~0#1| 1) (<= 4 |ULTIMATE.start_correct_version_~w#1|) (<= 4 |ULTIMATE.start_student_version_#in~w#1|) (<= 0 |ULTIMATE.start_correct_version_~is_divisible~0#1|) (= ~true~0 1) (<= |ULTIMATE.start_correct_version_~is_divisible~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 4 |ULTIMATE.start_correct_version_#in~w#1|) (not (< |ULTIMATE.start_student_version_~i~1#1| |ULTIMATE.start_student_version_~w#1|)) (= ~false~0 0) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (or (and (not (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start_student_version_~is_divisible~1#1| ~false~0)) (and (<= 1 |ULTIMATE.start_student_version_~is_divisible~1#1|) (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|) (<= |ULTIMATE.start_student_version_~is_divisible~1#1| 1))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~is_divisible1~0#1|) (= |ULTIMATE.start_student_version_~is_divisible~1#1| |ULTIMATE.start_student_version_#res#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (= |#NULL.base| 0))' at error location [2022-11-19 08:16:22,344 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:16:22,345 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:16:22,345 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 55, 55] total 160 [2022-11-19 08:16:22,345 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [605117730] [2022-11-19 08:16:22,345 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:16:22,345 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 160 states [2022-11-19 08:16:22,345 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:16:22,346 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 160 interpolants. [2022-11-19 08:16:22,347 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=646, Invalid=27746, Unknown=0, NotChecked=0, Total=28392 [2022-11-19 08:16:22,347 INFO L87 Difference]: Start difference. First operand 57 states and 58 transitions. Second operand has 160 states, 160 states have (on average 1.01875) internal successors, (163), 160 states have internal predecessors, (163), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:16:39,090 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:16:39,091 INFO L93 Difference]: Finished difference Result 91 states and 94 transitions. [2022-11-19 08:16:39,091 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2022-11-19 08:16:39,091 INFO L78 Accepts]: Start accepts. Automaton has has 160 states, 160 states have (on average 1.01875) internal successors, (163), 160 states have internal predecessors, (163), 0 states have call successors, (0), 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 [2022-11-19 08:16:39,092 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:16:39,092 INFO L225 Difference]: With dead ends: 91 [2022-11-19 08:16:39,092 INFO L226 Difference]: Without dead ends: 58 [2022-11-19 08:16:39,094 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 250 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 196 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10806 ImplicationChecksByTransitivity, 37.4s TimeCoverageRelationStatistics Valid=1090, Invalid=37916, Unknown=0, NotChecked=0, Total=39006 [2022-11-19 08:16:39,094 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 250 mSDsluCounter, 184 mSDsCounter, 0 mSdLazyCounter, 5635 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 250 SdHoareTripleChecker+Valid, 186 SdHoareTripleChecker+Invalid, 5643 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 5635 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.3s IncrementalHoareTripleChecker+Time [2022-11-19 08:16:39,094 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [250 Valid, 186 Invalid, 5643 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 5635 Invalid, 0 Unknown, 0 Unchecked, 4.3s Time] [2022-11-19 08:16:39,095 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2022-11-19 08:16:39,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2022-11-19 08:16:39,150 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) [2022-11-19 08:16:39,151 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 59 transitions. [2022-11-19 08:16:39,151 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 59 transitions. Word has length 56 [2022-11-19 08:16:39,151 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:16:39,151 INFO L495 AbstractCegarLoop]: Abstraction has 58 states and 59 transitions. [2022-11-19 08:16:39,151 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 160 states, 160 states have (on average 1.01875) internal successors, (163), 160 states have internal predecessors, (163), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:16:39,152 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 59 transitions. [2022-11-19 08:16:39,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2022-11-19 08:16:39,152 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:16:39,152 INFO L195 NwaCegarLoop]: trace histogram [24, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:16:39,157 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Forceful destruction successful, exit code 0 [2022-11-19 08:16:39,355 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2022-11-19 08:16:39,355 INFO L420 AbstractCegarLoop]: === Iteration 51 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:16:39,355 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:16:39,355 INFO L85 PathProgramCache]: Analyzing trace with hash 331896113, now seen corresponding path program 45 times [2022-11-19 08:16:39,355 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:16:39,355 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [970703821] [2022-11-19 08:16:39,356 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:16:39,356 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:16:39,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:16:41,709 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 253 proven. 323 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:16:41,709 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:16:41,709 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [970703821] [2022-11-19 08:16:41,709 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [970703821] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:16:41,709 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1866438733] [2022-11-19 08:16:41,709 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 08:16:41,709 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:16:41,710 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:16:41,710 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:16:41,713 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Waiting until timeout for monitored process [2022-11-19 08:16:41,770 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 08:16:41,771 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:16:41,773 INFO L263 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 54 conjunts are in the unsatisfiable core [2022-11-19 08:16:41,774 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:16:44,346 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 276 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:16:44,346 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:16:46,977 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 300 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:16:46,977 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1866438733] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:16:46,977 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1813548034] [2022-11-19 08:16:46,978 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-19 08:16:46,978 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:16:46,979 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:16:46,979 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:16:46,979 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:16:47,087 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:16:48,689 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '22221#(and (<= 4 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_correct_version_#res#1| 1) (<= 4 |ULTIMATE.start_student_version_~w#1|) (<= |ULTIMATE.start_main_~is_divisible1~0#1| 1) (<= 4 |ULTIMATE.start_correct_version_~w#1|) (<= 4 |ULTIMATE.start_student_version_#in~w#1|) (<= 0 |ULTIMATE.start_correct_version_~is_divisible~0#1|) (= ~true~0 1) (<= |ULTIMATE.start_correct_version_~is_divisible~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 4 |ULTIMATE.start_correct_version_#in~w#1|) (not (< |ULTIMATE.start_student_version_~i~1#1| |ULTIMATE.start_student_version_~w#1|)) (= ~false~0 0) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (or (and (not (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start_student_version_~is_divisible~1#1| ~false~0)) (and (<= 1 |ULTIMATE.start_student_version_~is_divisible~1#1|) (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|) (<= |ULTIMATE.start_student_version_~is_divisible~1#1| 1))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~is_divisible1~0#1|) (= |ULTIMATE.start_student_version_~is_divisible~1#1| |ULTIMATE.start_student_version_#res#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (= |#NULL.base| 0))' at error location [2022-11-19 08:16:48,689 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:16:48,689 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:16:48,689 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 53, 53] total 129 [2022-11-19 08:16:48,689 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1339789314] [2022-11-19 08:16:48,689 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:16:48,690 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 129 states [2022-11-19 08:16:48,690 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:16:48,691 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 129 interpolants. [2022-11-19 08:16:48,692 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3132, Invalid=15774, Unknown=0, NotChecked=0, Total=18906 [2022-11-19 08:16:48,693 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) [2022-11-19 08:16:50,717 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:16:50,717 INFO L93 Difference]: Finished difference Result 63 states and 64 transitions. [2022-11-19 08:16:50,717 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2022-11-19 08:16:50,718 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 [2022-11-19 08:16:50,718 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:16:50,719 INFO L225 Difference]: With dead ends: 63 [2022-11-19 08:16:50,719 INFO L226 Difference]: Without dead ends: 59 [2022-11-19 08:16:50,721 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 249 GetRequests, 61 SyntacticMatches, 26 SemanticMatches, 162 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14359 ImplicationChecksByTransitivity, 9.6s TimeCoverageRelationStatistics Valid=6111, Invalid=20621, Unknown=0, NotChecked=0, Total=26732 [2022-11-19 08:16:50,721 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 323 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 423 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 323 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 432 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 423 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-19 08:16:50,722 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [323 Valid, 21 Invalid, 432 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 423 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-19 08:16:50,722 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2022-11-19 08:16:50,792 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2022-11-19 08:16:50,793 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) [2022-11-19 08:16:50,793 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 60 transitions. [2022-11-19 08:16:50,793 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 60 transitions. Word has length 57 [2022-11-19 08:16:50,793 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:16:50,793 INFO L495 AbstractCegarLoop]: Abstraction has 59 states and 60 transitions. [2022-11-19 08:16:50,794 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) [2022-11-19 08:16:50,794 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 60 transitions. [2022-11-19 08:16:50,794 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-11-19 08:16:50,794 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:16:50,794 INFO L195 NwaCegarLoop]: trace histogram [24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:16:50,805 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Forceful destruction successful, exit code 0 [2022-11-19 08:16:51,000 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50,48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:16:51,000 INFO L420 AbstractCegarLoop]: === Iteration 52 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:16:51,000 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:16:51,001 INFO L85 PathProgramCache]: Analyzing trace with hash 1688943730, now seen corresponding path program 46 times [2022-11-19 08:16:51,001 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:16:51,001 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1980369705] [2022-11-19 08:16:51,001 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:16:51,001 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:16:51,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:16:54,630 INFO L134 CoverageAnalysis]: Checked inductivity of 600 backedges. 0 proven. 600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:16:54,630 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:16:54,630 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1980369705] [2022-11-19 08:16:54,630 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1980369705] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:16:54,630 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1314224827] [2022-11-19 08:16:54,630 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 08:16:54,631 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:16:54,631 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:16:54,631 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:16:54,634 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Waiting until timeout for monitored process [2022-11-19 08:16:54,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:16:54,705 WARN L261 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 130 conjunts are in the unsatisfiable core [2022-11-19 08:16:54,707 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:17:06,048 INFO L134 CoverageAnalysis]: Checked inductivity of 600 backedges. 0 proven. 600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:17:06,048 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:17:15,378 INFO L134 CoverageAnalysis]: Checked inductivity of 600 backedges. 0 proven. 600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:17:15,378 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1314224827] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:17:15,378 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1647137557] [2022-11-19 08:17:15,379 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-19 08:17:15,379 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:17:15,379 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:17:15,379 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:17:15,379 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:17:15,504 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:17:18,654 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '23016#(and (<= 4 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_correct_version_#res#1| 1) (<= 4 |ULTIMATE.start_student_version_~w#1|) (<= |ULTIMATE.start_main_~is_divisible1~0#1| 1) (<= 4 |ULTIMATE.start_correct_version_~w#1|) (<= 4 |ULTIMATE.start_student_version_#in~w#1|) (<= 0 |ULTIMATE.start_correct_version_~is_divisible~0#1|) (= ~true~0 1) (<= |ULTIMATE.start_correct_version_~is_divisible~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 4 |ULTIMATE.start_correct_version_#in~w#1|) (not (< |ULTIMATE.start_student_version_~i~1#1| |ULTIMATE.start_student_version_~w#1|)) (= ~false~0 0) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (or (and (not (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start_student_version_~is_divisible~1#1| ~false~0)) (and (<= 1 |ULTIMATE.start_student_version_~is_divisible~1#1|) (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|) (<= |ULTIMATE.start_student_version_~is_divisible~1#1| 1))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~is_divisible1~0#1|) (= |ULTIMATE.start_student_version_~is_divisible~1#1| |ULTIMATE.start_student_version_#res#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (= |#NULL.base| 0))' at error location [2022-11-19 08:17:18,655 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:17:18,655 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:17:18,655 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 57, 57] total 165 [2022-11-19 08:17:18,655 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1846557465] [2022-11-19 08:17:18,655 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:17:18,656 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 165 states [2022-11-19 08:17:18,656 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:17:18,656 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 165 interpolants. [2022-11-19 08:17:18,658 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=667, Invalid=29435, Unknown=0, NotChecked=0, Total=30102 [2022-11-19 08:17:18,659 INFO L87 Difference]: Start difference. First operand 59 states and 60 transitions. Second operand has 165 states, 165 states have (on average 1.0242424242424242) internal successors, (169), 165 states have internal predecessors, (169), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:17:38,648 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:17:38,648 INFO L93 Difference]: Finished difference Result 94 states and 97 transitions. [2022-11-19 08:17:38,648 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2022-11-19 08:17:38,649 INFO L78 Accepts]: Start accepts. Automaton has has 165 states, 165 states have (on average 1.0242424242424242) internal successors, (169), 165 states have internal predecessors, (169), 0 states have call successors, (0), 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 [2022-11-19 08:17:38,649 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:17:38,649 INFO L225 Difference]: With dead ends: 94 [2022-11-19 08:17:38,649 INFO L226 Difference]: Without dead ends: 60 [2022-11-19 08:17:38,651 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 261 GetRequests, 56 SyntacticMatches, 1 SemanticMatches, 204 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11642 ImplicationChecksByTransitivity, 39.6s TimeCoverageRelationStatistics Valid=1257, Invalid=40973, Unknown=0, NotChecked=0, Total=42230 [2022-11-19 08:17:38,652 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 360 mSDsluCounter, 170 mSDsCounter, 0 mSdLazyCounter, 5840 mSolverCounterSat, 109 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 360 SdHoareTripleChecker+Valid, 172 SdHoareTripleChecker+Invalid, 5949 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 109 IncrementalHoareTripleChecker+Valid, 5840 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.5s IncrementalHoareTripleChecker+Time [2022-11-19 08:17:38,652 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [360 Valid, 172 Invalid, 5949 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [109 Valid, 5840 Invalid, 0 Unknown, 0 Unchecked, 4.5s Time] [2022-11-19 08:17:38,652 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2022-11-19 08:17:38,715 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2022-11-19 08:17:38,715 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) [2022-11-19 08:17:38,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2022-11-19 08:17:38,716 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 58 [2022-11-19 08:17:38,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:17:38,716 INFO L495 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2022-11-19 08:17:38,716 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 165 states, 165 states have (on average 1.0242424242424242) internal successors, (169), 165 states have internal predecessors, (169), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:17:38,716 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2022-11-19 08:17:38,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-11-19 08:17:38,717 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:17:38,717 INFO L195 NwaCegarLoop]: trace histogram [25, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:17:38,723 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Forceful destruction successful, exit code 0 [2022-11-19 08:17:38,917 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51,49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:17:38,917 INFO L420 AbstractCegarLoop]: === Iteration 53 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:17:38,917 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:17:38,918 INFO L85 PathProgramCache]: Analyzing trace with hash -613525714, now seen corresponding path program 47 times [2022-11-19 08:17:38,918 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:17:38,918 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [192276196] [2022-11-19 08:17:38,918 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:17:38,918 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:17:38,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:17:41,472 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 276 proven. 349 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:17:41,473 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:17:41,473 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [192276196] [2022-11-19 08:17:41,473 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [192276196] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:17:41,473 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [791062731] [2022-11-19 08:17:41,473 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 08:17:41,473 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:17:41,473 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:17:41,474 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:17:41,476 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Waiting until timeout for monitored process [2022-11-19 08:17:41,547 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2022-11-19 08:17:41,547 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:17:41,549 INFO L263 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 56 conjunts are in the unsatisfiable core [2022-11-19 08:17:41,550 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:17:44,299 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 300 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:17:44,299 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:17:47,109 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 325 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:17:47,110 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [791062731] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:17:47,110 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [277918886] [2022-11-19 08:17:47,111 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-19 08:17:47,111 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:17:47,111 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:17:47,111 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:17:47,111 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:17:47,216 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:17:48,862 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '23860#(and (<= 4 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_correct_version_#res#1| 1) (<= 4 |ULTIMATE.start_student_version_~w#1|) (<= |ULTIMATE.start_main_~is_divisible1~0#1| 1) (<= 4 |ULTIMATE.start_correct_version_~w#1|) (<= 4 |ULTIMATE.start_student_version_#in~w#1|) (<= 0 |ULTIMATE.start_correct_version_~is_divisible~0#1|) (= ~true~0 1) (<= |ULTIMATE.start_correct_version_~is_divisible~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 4 |ULTIMATE.start_correct_version_#in~w#1|) (not (< |ULTIMATE.start_student_version_~i~1#1| |ULTIMATE.start_student_version_~w#1|)) (= ~false~0 0) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (or (and (not (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start_student_version_~is_divisible~1#1| ~false~0)) (and (<= 1 |ULTIMATE.start_student_version_~is_divisible~1#1|) (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|) (<= |ULTIMATE.start_student_version_~is_divisible~1#1| 1))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~is_divisible1~0#1|) (= |ULTIMATE.start_student_version_~is_divisible~1#1| |ULTIMATE.start_student_version_#res#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (= |#NULL.base| 0))' at error location [2022-11-19 08:17:48,862 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:17:48,862 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:17:48,862 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 55, 55] total 134 [2022-11-19 08:17:48,862 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [192888177] [2022-11-19 08:17:48,862 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:17:48,863 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 134 states [2022-11-19 08:17:48,863 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:17:48,863 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 134 interpolants. [2022-11-19 08:17:48,864 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3373, Invalid=16933, Unknown=0, NotChecked=0, Total=20306 [2022-11-19 08:17:48,864 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) [2022-11-19 08:17:51,005 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:17:51,005 INFO L93 Difference]: Finished difference Result 65 states and 66 transitions. [2022-11-19 08:17:51,005 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2022-11-19 08:17:51,005 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 [2022-11-19 08:17:51,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:17:51,006 INFO L225 Difference]: With dead ends: 65 [2022-11-19 08:17:51,006 INFO L226 Difference]: Without dead ends: 61 [2022-11-19 08:17:51,008 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 258 GetRequests, 63 SyntacticMatches, 27 SemanticMatches, 168 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15467 ImplicationChecksByTransitivity, 10.2s TimeCoverageRelationStatistics Valid=6588, Invalid=22142, Unknown=0, NotChecked=0, Total=28730 [2022-11-19 08:17:51,008 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 231 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 472 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 231 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 479 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 472 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-19 08:17:51,009 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [231 Valid, 24 Invalid, 479 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 472 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-19 08:17:51,009 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2022-11-19 08:17:51,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2022-11-19 08:17:51,107 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) [2022-11-19 08:17:51,107 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 62 transitions. [2022-11-19 08:17:51,108 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 62 transitions. Word has length 59 [2022-11-19 08:17:51,108 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:17:51,108 INFO L495 AbstractCegarLoop]: Abstraction has 61 states and 62 transitions. [2022-11-19 08:17:51,108 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) [2022-11-19 08:17:51,108 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 62 transitions. [2022-11-19 08:17:51,108 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2022-11-19 08:17:51,108 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:17:51,109 INFO L195 NwaCegarLoop]: trace histogram [25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:17:51,113 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Forceful destruction successful, exit code 0 [2022-11-19 08:17:51,309 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52,50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:17:51,309 INFO L420 AbstractCegarLoop]: === Iteration 54 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:17:51,309 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:17:51,309 INFO L85 PathProgramCache]: Analyzing trace with hash -1849329131, now seen corresponding path program 48 times [2022-11-19 08:17:51,309 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:17:51,310 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1514693477] [2022-11-19 08:17:51,310 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:17:51,310 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:17:51,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:17:55,112 INFO L134 CoverageAnalysis]: Checked inductivity of 650 backedges. 0 proven. 650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:17:55,112 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:17:55,113 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1514693477] [2022-11-19 08:17:55,113 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1514693477] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:17:55,113 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1823923924] [2022-11-19 08:17:55,113 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 08:17:55,113 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:17:55,113 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:17:55,117 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:17:55,119 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Waiting until timeout for monitored process [2022-11-19 08:17:55,185 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 08:17:55,185 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:17:55,188 WARN L261 TraceCheckSpWp]: Trace formula consists of 226 conjuncts, 136 conjunts are in the unsatisfiable core [2022-11-19 08:17:55,190 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:18:07,807 INFO L134 CoverageAnalysis]: Checked inductivity of 650 backedges. 0 proven. 650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:18:07,807 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:18:18,683 INFO L134 CoverageAnalysis]: Checked inductivity of 650 backedges. 0 proven. 650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:18:18,684 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1823923924] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:18:18,684 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [856497376] [2022-11-19 08:18:18,685 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-19 08:18:18,685 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:18:18,685 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:18:18,685 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:18:18,685 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:18:18,808 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:18:22,137 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '24684#(and (<= 4 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_correct_version_#res#1| 1) (<= 4 |ULTIMATE.start_student_version_~w#1|) (<= |ULTIMATE.start_main_~is_divisible1~0#1| 1) (<= 4 |ULTIMATE.start_correct_version_~w#1|) (<= 4 |ULTIMATE.start_student_version_#in~w#1|) (<= 0 |ULTIMATE.start_correct_version_~is_divisible~0#1|) (= ~true~0 1) (<= |ULTIMATE.start_correct_version_~is_divisible~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 4 |ULTIMATE.start_correct_version_#in~w#1|) (not (< |ULTIMATE.start_student_version_~i~1#1| |ULTIMATE.start_student_version_~w#1|)) (= ~false~0 0) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (or (and (not (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start_student_version_~is_divisible~1#1| ~false~0)) (and (<= 1 |ULTIMATE.start_student_version_~is_divisible~1#1|) (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|) (<= |ULTIMATE.start_student_version_~is_divisible~1#1| 1))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~is_divisible1~0#1|) (= |ULTIMATE.start_student_version_~is_divisible~1#1| |ULTIMATE.start_student_version_#res#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (= |#NULL.base| 0))' at error location [2022-11-19 08:18:22,137 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:18:22,137 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:18:22,138 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59, 59] total 172 [2022-11-19 08:18:22,138 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [613066864] [2022-11-19 08:18:22,138 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:18:22,138 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 172 states [2022-11-19 08:18:22,138 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:18:22,139 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 172 interpolants. [2022-11-19 08:18:22,140 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=694, Invalid=31886, Unknown=0, NotChecked=0, Total=32580 [2022-11-19 08:18:22,140 INFO L87 Difference]: Start difference. First operand 61 states and 62 transitions. Second operand has 172 states, 172 states have (on average 1.0174418604651163) internal successors, (175), 172 states have internal predecessors, (175), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:18:39,830 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:18:39,830 INFO L93 Difference]: Finished difference Result 97 states and 100 transitions. [2022-11-19 08:18:39,830 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2022-11-19 08:18:39,831 INFO L78 Accepts]: Start accepts. Automaton has has 172 states, 172 states have (on average 1.0174418604651163) internal successors, (175), 172 states have internal predecessors, (175), 0 states have call successors, (0), 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 [2022-11-19 08:18:39,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:18:39,831 INFO L225 Difference]: With dead ends: 97 [2022-11-19 08:18:39,831 INFO L226 Difference]: Without dead ends: 62 [2022-11-19 08:18:39,833 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 268 GetRequests, 58 SyntacticMatches, 0 SemanticMatches, 210 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12424 ImplicationChecksByTransitivity, 39.3s TimeCoverageRelationStatistics Valid=1170, Invalid=43562, Unknown=0, NotChecked=0, Total=44732 [2022-11-19 08:18:39,834 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 241 mSDsluCounter, 197 mSDsCounter, 0 mSdLazyCounter, 6436 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 241 SdHoareTripleChecker+Valid, 199 SdHoareTripleChecker+Invalid, 6444 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 6436 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.1s IncrementalHoareTripleChecker+Time [2022-11-19 08:18:39,834 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [241 Valid, 199 Invalid, 6444 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 6436 Invalid, 0 Unknown, 0 Unchecked, 5.1s Time] [2022-11-19 08:18:39,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2022-11-19 08:18:39,903 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 62. [2022-11-19 08:18:39,903 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) [2022-11-19 08:18:39,903 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 63 transitions. [2022-11-19 08:18:39,903 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 63 transitions. Word has length 60 [2022-11-19 08:18:39,904 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:18:39,904 INFO L495 AbstractCegarLoop]: Abstraction has 62 states and 63 transitions. [2022-11-19 08:18:39,904 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 172 states, 172 states have (on average 1.0174418604651163) internal successors, (175), 172 states have internal predecessors, (175), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:18:39,904 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 63 transitions. [2022-11-19 08:18:39,904 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-11-19 08:18:39,904 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:18:39,904 INFO L195 NwaCegarLoop]: trace histogram [26, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:18:39,908 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Forceful destruction successful, exit code 0 [2022-11-19 08:18:40,105 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable53 [2022-11-19 08:18:40,105 INFO L420 AbstractCegarLoop]: === Iteration 55 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:18:40,105 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:18:40,105 INFO L85 PathProgramCache]: Analyzing trace with hash 1680659921, now seen corresponding path program 49 times [2022-11-19 08:18:40,105 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:18:40,105 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1406961041] [2022-11-19 08:18:40,105 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:18:40,106 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:18:40,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:18:42,805 INFO L134 CoverageAnalysis]: Checked inductivity of 676 backedges. 300 proven. 376 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:18:42,805 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:18:42,805 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1406961041] [2022-11-19 08:18:42,805 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1406961041] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:18:42,805 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [218295593] [2022-11-19 08:18:42,805 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 08:18:42,805 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:18:42,806 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:18:42,806 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:18:42,808 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Waiting until timeout for monitored process [2022-11-19 08:18:42,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:18:42,868 INFO L263 TraceCheckSpWp]: Trace formula consists of 229 conjuncts, 58 conjunts are in the unsatisfiable core [2022-11-19 08:18:42,870 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:18:45,796 INFO L134 CoverageAnalysis]: Checked inductivity of 676 backedges. 325 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:18:45,797 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:18:48,801 INFO L134 CoverageAnalysis]: Checked inductivity of 676 backedges. 351 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:18:48,801 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [218295593] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:18:48,801 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1176148847] [2022-11-19 08:18:48,802 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-19 08:18:48,802 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:18:48,802 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:18:48,803 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:18:48,803 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:18:48,949 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:18:50,607 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '25553#(and (<= 4 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_correct_version_#res#1| 1) (<= 4 |ULTIMATE.start_student_version_~w#1|) (<= |ULTIMATE.start_main_~is_divisible1~0#1| 1) (<= 4 |ULTIMATE.start_correct_version_~w#1|) (<= 4 |ULTIMATE.start_student_version_#in~w#1|) (<= 0 |ULTIMATE.start_correct_version_~is_divisible~0#1|) (= ~true~0 1) (<= |ULTIMATE.start_correct_version_~is_divisible~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 4 |ULTIMATE.start_correct_version_#in~w#1|) (not (< |ULTIMATE.start_student_version_~i~1#1| |ULTIMATE.start_student_version_~w#1|)) (= ~false~0 0) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (or (and (not (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start_student_version_~is_divisible~1#1| ~false~0)) (and (<= 1 |ULTIMATE.start_student_version_~is_divisible~1#1|) (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|) (<= |ULTIMATE.start_student_version_~is_divisible~1#1| 1))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~is_divisible1~0#1|) (= |ULTIMATE.start_student_version_~is_divisible~1#1| |ULTIMATE.start_student_version_#res#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (= |#NULL.base| 0))' at error location [2022-11-19 08:18:50,607 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:18:50,608 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:18:50,608 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 57, 57] total 139 [2022-11-19 08:18:50,608 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1202986332] [2022-11-19 08:18:50,608 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:18:50,608 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 139 states [2022-11-19 08:18:50,608 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:18:50,609 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 139 interpolants. [2022-11-19 08:18:50,611 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3623, Invalid=18133, Unknown=0, NotChecked=0, Total=21756 [2022-11-19 08:18:50,611 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) [2022-11-19 08:18:52,881 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:18:52,881 INFO L93 Difference]: Finished difference Result 67 states and 68 transitions. [2022-11-19 08:18:52,881 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2022-11-19 08:18:52,882 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 [2022-11-19 08:18:52,882 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:18:52,882 INFO L225 Difference]: With dead ends: 67 [2022-11-19 08:18:52,882 INFO L226 Difference]: Without dead ends: 63 [2022-11-19 08:18:52,883 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 267 GetRequests, 65 SyntacticMatches, 28 SemanticMatches, 174 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16616 ImplicationChecksByTransitivity, 10.8s TimeCoverageRelationStatistics Valid=7083, Invalid=23717, Unknown=0, NotChecked=0, Total=30800 [2022-11-19 08:18:52,883 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 341 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 420 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 341 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 430 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 420 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-19 08:18:52,884 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [341 Valid, 25 Invalid, 430 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 420 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-19 08:18:52,884 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2022-11-19 08:18:52,944 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2022-11-19 08:18:52,944 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) [2022-11-19 08:18:52,944 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 64 transitions. [2022-11-19 08:18:52,945 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 64 transitions. Word has length 61 [2022-11-19 08:18:52,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:18:52,945 INFO L495 AbstractCegarLoop]: Abstraction has 63 states and 64 transitions. [2022-11-19 08:18:52,945 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) [2022-11-19 08:18:52,945 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 64 transitions. [2022-11-19 08:18:52,945 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2022-11-19 08:18:52,945 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:18:52,945 INFO L195 NwaCegarLoop]: trace histogram [26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:18:52,950 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Forceful destruction successful, exit code 0 [2022-11-19 08:18:53,146 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable54 [2022-11-19 08:18:53,146 INFO L420 AbstractCegarLoop]: === Iteration 56 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:18:53,146 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:18:53,146 INFO L85 PathProgramCache]: Analyzing trace with hash 550948818, now seen corresponding path program 50 times [2022-11-19 08:18:53,146 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:18:53,146 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1988280062] [2022-11-19 08:18:53,147 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:18:53,147 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:18:53,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:18:57,236 INFO L134 CoverageAnalysis]: Checked inductivity of 702 backedges. 0 proven. 702 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:18:57,236 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:18:57,236 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1988280062] [2022-11-19 08:18:57,236 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1988280062] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:18:57,237 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1723151093] [2022-11-19 08:18:57,237 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 08:18:57,237 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:18:57,237 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:18:57,238 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:18:57,240 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38a41436-7e51-4f5f-abfb-c82c71c5cd4c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Waiting until timeout for monitored process [2022-11-19 08:18:57,318 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2022-11-19 08:18:57,318 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:18:57,322 WARN L261 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 141 conjunts are in the unsatisfiable core [2022-11-19 08:18:57,323 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:19:10,056 INFO L134 CoverageAnalysis]: Checked inductivity of 702 backedges. 0 proven. 702 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:19:10,056 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:19:21,931 INFO L134 CoverageAnalysis]: Checked inductivity of 702 backedges. 0 proven. 702 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:19:21,931 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1723151093] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:19:21,931 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1608126432] [2022-11-19 08:19:21,932 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-19 08:19:21,932 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:19:21,932 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:19:21,932 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:19:21,933 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:19:22,037 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:19:25,398 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '26405#(and (<= 4 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_correct_version_#res#1| 1) (<= 4 |ULTIMATE.start_student_version_~w#1|) (<= |ULTIMATE.start_main_~is_divisible1~0#1| 1) (<= 4 |ULTIMATE.start_correct_version_~w#1|) (<= 4 |ULTIMATE.start_student_version_#in~w#1|) (<= 0 |ULTIMATE.start_correct_version_~is_divisible~0#1|) (= ~true~0 1) (<= |ULTIMATE.start_correct_version_~is_divisible~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 4 |ULTIMATE.start_correct_version_#in~w#1|) (not (< |ULTIMATE.start_student_version_~i~1#1| |ULTIMATE.start_student_version_~w#1|)) (= ~false~0 0) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (or (and (not (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start_student_version_~is_divisible~1#1| ~false~0)) (and (<= 1 |ULTIMATE.start_student_version_~is_divisible~1#1|) (= |ULTIMATE.start_student_version_~w#1| |ULTIMATE.start_student_version_~i~1#1|) (<= |ULTIMATE.start_student_version_~is_divisible~1#1| 1))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~is_divisible1~0#1|) (= |ULTIMATE.start_student_version_~is_divisible~1#1| |ULTIMATE.start_student_version_#res#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (= |#NULL.base| 0))' at error location [2022-11-19 08:19:25,398 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:19:25,399 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:19:25,399 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 61, 61] total 178 [2022-11-19 08:19:25,399 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [548402014] [2022-11-19 08:19:25,399 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:19:25,400 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 178 states [2022-11-19 08:19:25,400 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:19:25,400 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 178 interpolants. [2022-11-19 08:19:25,402 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=774, Invalid=34008, Unknown=0, NotChecked=0, Total=34782 [2022-11-19 08:19:25,403 INFO L87 Difference]: Start difference. First operand 63 states and 64 transitions. Second operand has 178 states, 178 states have (on average 1.0168539325842696) internal successors, (181), 178 states have internal predecessors, (181), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)