./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 6b4ec56b Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/config/TaipanReach.xml -i ../../sv-benchmarks/c/loops-crafted-1/watermelon.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9 --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-6b4ec56 [2022-11-20 21:12:46,596 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-20 21:12:46,598 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-20 21:12:46,617 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-20 21:12:46,618 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-20 21:12:46,619 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-20 21:12:46,620 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-20 21:12:46,622 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-20 21:12:46,623 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-20 21:12:46,624 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-20 21:12:46,625 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-20 21:12:46,626 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-20 21:12:46,627 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-20 21:12:46,628 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-20 21:12:46,629 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-20 21:12:46,630 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-20 21:12:46,631 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-20 21:12:46,632 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-20 21:12:46,634 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-20 21:12:46,636 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-20 21:12:46,637 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-20 21:12:46,639 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-20 21:12:46,640 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-20 21:12:46,641 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-20 21:12:46,644 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-20 21:12:46,645 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-20 21:12:46,645 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-20 21:12:46,646 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-20 21:12:46,646 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-20 21:12:46,648 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-20 21:12:46,648 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-20 21:12:46,649 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-20 21:12:46,650 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-20 21:12:46,650 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-20 21:12:46,651 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-20 21:12:46,652 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-20 21:12:46,652 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-20 21:12:46,653 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-20 21:12:46,653 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-20 21:12:46,654 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-20 21:12:46,655 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-20 21:12:46,656 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-20 21:12:46,677 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-20 21:12:46,678 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-20 21:12:46,678 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-20 21:12:46,679 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-20 21:12:46,679 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-20 21:12:46,680 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-20 21:12:46,680 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-20 21:12:46,680 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-20 21:12:46,680 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-20 21:12:46,681 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-20 21:12:46,681 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-20 21:12:46,681 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-20 21:12:46,681 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-20 21:12:46,682 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-20 21:12:46,682 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-20 21:12:46,682 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-20 21:12:46,682 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-20 21:12:46,683 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-20 21:12:46,683 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-20 21:12:46,684 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-20 21:12:46,684 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-20 21:12:46,684 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-20 21:12:46,684 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-20 21:12:46,685 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-20 21:12:46,685 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-20 21:12:46,685 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-20 21:12:46,685 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-20 21:12:46,685 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-20 21:12:46,686 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-20 21:12:46,686 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-20 21:12:46,686 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-20 21:12:46,686 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-20 21:12:46,687 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-20 21:12:46,687 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-20 21:12:46,687 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-20 21:12:46,687 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-20 21:12:46,688 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-20 21:12:46,688 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-20 21:12:46,688 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-20 21:12:46,688 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-20 21:12:46,689 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-20 21:12:46,689 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_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> dda0b992ac1600896503297d86377b482d0a82ded923ea00c7e9ff3fed4db7e7 [2022-11-20 21:12:46,986 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-20 21:12:47,016 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-20 21:12:47,019 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-20 21:12:47,020 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-20 21:12:47,021 INFO L275 PluginConnector]: CDTParser initialized [2022-11-20 21:12:47,022 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/../../sv-benchmarks/c/loops-crafted-1/watermelon.c [2022-11-20 21:12:50,118 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-20 21:12:50,405 INFO L351 CDTParser]: Found 1 translation units. [2022-11-20 21:12:50,406 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/sv-benchmarks/c/loops-crafted-1/watermelon.c [2022-11-20 21:12:50,413 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/data/7fb076e7c/9ef044bc798846faa9c41e4f490a251d/FLAG0a6d09f7b [2022-11-20 21:12:50,436 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/data/7fb076e7c/9ef044bc798846faa9c41e4f490a251d [2022-11-20 21:12:50,442 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-20 21:12:50,445 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-20 21:12:50,450 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-20 21:12:50,451 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-20 21:12:50,454 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-20 21:12:50,455 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 09:12:50" (1/1) ... [2022-11-20 21:12:50,457 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@548b1682 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 09:12:50, skipping insertion in model container [2022-11-20 21:12:50,458 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 09:12:50" (1/1) ... [2022-11-20 21:12:50,467 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-20 21:12:50,491 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-20 21:12:50,633 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/sv-benchmarks/c/loops-crafted-1/watermelon.c[373,386] [2022-11-20 21:12:50,659 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-20 21:12:50,674 INFO L203 MainTranslator]: Completed pre-run [2022-11-20 21:12:50,689 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/sv-benchmarks/c/loops-crafted-1/watermelon.c[373,386] [2022-11-20 21:12:50,710 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-20 21:12:50,731 INFO L208 MainTranslator]: Completed translation [2022-11-20 21:12:50,732 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 09:12:50 WrapperNode [2022-11-20 21:12:50,732 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-20 21:12:50,734 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-20 21:12:50,735 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-20 21:12:50,735 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-20 21:12:50,744 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 09:12:50" (1/1) ... [2022-11-20 21:12:50,757 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 09:12:50" (1/1) ... [2022-11-20 21:12:50,785 INFO L138 Inliner]: procedures = 15, calls = 10, calls flagged for inlining = 5, calls inlined = 5, statements flattened = 64 [2022-11-20 21:12:50,785 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-20 21:12:50,786 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-20 21:12:50,786 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-20 21:12:50,786 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-20 21:12:50,796 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 09:12:50" (1/1) ... [2022-11-20 21:12:50,797 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 09:12:50" (1/1) ... [2022-11-20 21:12:50,809 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 09:12:50" (1/1) ... [2022-11-20 21:12:50,810 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 09:12:50" (1/1) ... [2022-11-20 21:12:50,812 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 09:12:50" (1/1) ... [2022-11-20 21:12:50,816 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 09:12:50" (1/1) ... [2022-11-20 21:12:50,817 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 09:12:50" (1/1) ... [2022-11-20 21:12:50,818 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 09:12:50" (1/1) ... [2022-11-20 21:12:50,829 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-20 21:12:50,830 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-20 21:12:50,830 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-20 21:12:50,830 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-20 21:12:50,831 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 09:12:50" (1/1) ... [2022-11-20 21:12:50,838 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-20 21:12:50,849 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:12:50,868 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-20 21:12:50,891 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-20 21:12:50,912 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-20 21:12:50,912 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-20 21:12:50,912 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-20 21:12:50,913 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-20 21:12:50,989 INFO L235 CfgBuilder]: Building ICFG [2022-11-20 21:12:50,991 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-20 21:12:51,148 INFO L276 CfgBuilder]: Performing block encoding [2022-11-20 21:12:51,187 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-20 21:12:51,187 INFO L300 CfgBuilder]: Removed 2 assume(true) statements. [2022-11-20 21:12:51,190 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 09:12:51 BoogieIcfgContainer [2022-11-20 21:12:51,190 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-20 21:12:51,193 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-20 21:12:51,193 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-20 21:12:51,196 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-20 21:12:51,197 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.11 09:12:50" (1/3) ... [2022-11-20 21:12:51,197 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3a6cd149 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 09:12:51, skipping insertion in model container [2022-11-20 21:12:51,198 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 09:12:50" (2/3) ... [2022-11-20 21:12:51,198 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3a6cd149 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 09:12:51, skipping insertion in model container [2022-11-20 21:12:51,198 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 09:12:51" (3/3) ... [2022-11-20 21:12:51,200 INFO L112 eAbstractionObserver]: Analyzing ICFG watermelon.c [2022-11-20 21:12:51,225 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-20 21:12:51,225 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-20 21:12:51,275 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-20 21:12:51,300 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;@58d36724, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-20 21:12:51,300 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-20 21:12:51,305 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) [2022-11-20 21:12:51,316 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-11-20 21:12:51,316 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:12:51,317 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 21:12:51,318 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:12:51,324 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:12:51,324 INFO L85 PathProgramCache]: Analyzing trace with hash -1927148626, now seen corresponding path program 1 times [2022-11-20 21:12:51,350 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:12:51,352 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [337813351] [2022-11-20 21:12:51,352 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:12:51,353 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:12:51,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:12:51,864 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:12:51,875 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:12:51,875 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [337813351] [2022-11-20 21:12:51,876 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [337813351] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 21:12:51,876 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 21:12:51,876 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-11-20 21:12:51,878 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2068473557] [2022-11-20 21:12:51,879 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 21:12:51,883 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-20 21:12:51,883 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:12:51,916 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-20 21:12:51,917 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-20 21:12:51,920 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) [2022-11-20 21:12:52,080 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:12:52,080 INFO L93 Difference]: Finished difference Result 36 states and 41 transitions. [2022-11-20 21:12:52,084 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-20 21:12:52,086 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 [2022-11-20 21:12:52,086 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:12:52,097 INFO L225 Difference]: With dead ends: 36 [2022-11-20 21:12:52,098 INFO L226 Difference]: Without dead ends: 18 [2022-11-20 21:12:52,102 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 [2022-11-20 21:12:52,109 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 [2022-11-20 21:12:52,110 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] [2022-11-20 21:12:52,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2022-11-20 21:12:52,164 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 13. [2022-11-20 21:12:52,165 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) [2022-11-20 21:12:52,165 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 16 transitions. [2022-11-20 21:12:52,167 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 16 transitions. Word has length 8 [2022-11-20 21:12:52,167 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:12:52,167 INFO L495 AbstractCegarLoop]: Abstraction has 13 states and 16 transitions. [2022-11-20 21:12:52,167 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) [2022-11-20 21:12:52,168 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 16 transitions. [2022-11-20 21:12:52,168 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-20 21:12:52,168 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:12:52,168 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 21:12:52,169 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-20 21:12:52,169 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:12:52,170 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:12:52,170 INFO L85 PathProgramCache]: Analyzing trace with hash 390039330, now seen corresponding path program 1 times [2022-11-20 21:12:52,170 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:12:52,171 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [210875690] [2022-11-20 21:12:52,202 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:12:52,202 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:12:52,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:12:52,331 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:12:52,331 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:12:52,331 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [210875690] [2022-11-20 21:12:52,334 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [210875690] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 21:12:52,334 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 21:12:52,334 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-20 21:12:52,334 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1913714544] [2022-11-20 21:12:52,335 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 21:12:52,336 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-20 21:12:52,336 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:12:52,337 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-20 21:12:52,337 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-20 21:12:52,337 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) [2022-11-20 21:12:52,364 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:12:52,364 INFO L93 Difference]: Finished difference Result 18 states and 21 transitions. [2022-11-20 21:12:52,369 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 21:12:52,383 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 [2022-11-20 21:12:52,383 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:12:52,384 INFO L225 Difference]: With dead ends: 18 [2022-11-20 21:12:52,384 INFO L226 Difference]: Without dead ends: 14 [2022-11-20 21:12:52,384 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 [2022-11-20 21:12:52,386 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 [2022-11-20 21:12:52,386 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] [2022-11-20 21:12:52,387 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2022-11-20 21:12:52,389 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2022-11-20 21:12:52,389 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.3076923076923077) internal successors, (17), 13 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 21:12:52,390 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 17 transitions. [2022-11-20 21:12:52,390 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 17 transitions. Word has length 9 [2022-11-20 21:12:52,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:12:52,391 INFO L495 AbstractCegarLoop]: Abstraction has 14 states and 17 transitions. [2022-11-20 21:12:52,391 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) [2022-11-20 21:12:52,391 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 17 transitions. [2022-11-20 21:12:52,391 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-20 21:12:52,392 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:12:52,392 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 21:12:52,392 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-20 21:12:52,392 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:12:52,393 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:12:52,393 INFO L85 PathProgramCache]: Analyzing trace with hash -1862814498, now seen corresponding path program 1 times [2022-11-20 21:12:52,393 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:12:52,394 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1771433085] [2022-11-20 21:12:52,394 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:12:52,394 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:12:52,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:12:52,453 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:12:52,454 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:12:52,454 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1771433085] [2022-11-20 21:12:52,454 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1771433085] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 21:12:52,455 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 21:12:52,455 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-20 21:12:52,455 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1514805099] [2022-11-20 21:12:52,455 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 21:12:52,456 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-20 21:12:52,456 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:12:52,457 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-20 21:12:52,457 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-20 21:12:52,457 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) [2022-11-20 21:12:52,478 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:12:52,478 INFO L93 Difference]: Finished difference Result 23 states and 28 transitions. [2022-11-20 21:12:52,478 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 21:12:52,479 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 [2022-11-20 21:12:52,479 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:12:52,479 INFO L225 Difference]: With dead ends: 23 [2022-11-20 21:12:52,480 INFO L226 Difference]: Without dead ends: 15 [2022-11-20 21:12:52,480 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 [2022-11-20 21:12:52,481 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 [2022-11-20 21:12:52,482 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] [2022-11-20 21:12:52,483 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2022-11-20 21:12:52,486 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2022-11-20 21:12:52,486 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) [2022-11-20 21:12:52,486 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 18 transitions. [2022-11-20 21:12:52,487 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 18 transitions. Word has length 9 [2022-11-20 21:12:52,487 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:12:52,487 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 18 transitions. [2022-11-20 21:12:52,487 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) [2022-11-20 21:12:52,488 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 18 transitions. [2022-11-20 21:12:52,488 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-11-20 21:12:52,488 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:12:52,488 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 21:12:52,489 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-11-20 21:12:52,489 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:12:52,489 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:12:52,490 INFO L85 PathProgramCache]: Analyzing trace with hash -803583839, now seen corresponding path program 1 times [2022-11-20 21:12:52,490 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:12:52,490 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [522082600] [2022-11-20 21:12:52,490 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:12:52,491 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:12:52,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:12:52,571 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:12:52,572 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:12:52,572 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [522082600] [2022-11-20 21:12:52,572 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [522082600] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 21:12:52,573 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1615456843] [2022-11-20 21:12:52,573 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:12:52,574 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:12:52,574 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:12:52,582 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 21:12:52,603 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-20 21:12:52,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:12:52,662 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 6 conjunts are in the unsatisfiable core [2022-11-20 21:12:52,666 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 21:12:53,041 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 21:12:53,043 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 21:12:53,044 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1615456843] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 21:12:53,044 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-20 21:12:53,044 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [4] total 7 [2022-11-20 21:12:53,044 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [219547466] [2022-11-20 21:12:53,045 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 21:12:53,049 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-20 21:12:53,049 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:12:53,050 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-20 21:12:53,051 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-11-20 21:12:53,052 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) [2022-11-20 21:12:53,183 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:12:53,184 INFO L93 Difference]: Finished difference Result 25 states and 27 transitions. [2022-11-20 21:12:53,184 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-20 21:12:53,185 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 [2022-11-20 21:12:53,185 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:12:53,186 INFO L225 Difference]: With dead ends: 25 [2022-11-20 21:12:53,186 INFO L226 Difference]: Without dead ends: 17 [2022-11-20 21:12:53,187 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 [2022-11-20 21:12:53,196 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 [2022-11-20 21:12:53,198 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] [2022-11-20 21:12:53,200 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2022-11-20 21:12:53,219 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 13. [2022-11-20 21:12:53,219 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) [2022-11-20 21:12:53,220 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 15 transitions. [2022-11-20 21:12:53,220 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 15 transitions. Word has length 10 [2022-11-20 21:12:53,220 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:12:53,221 INFO L495 AbstractCegarLoop]: Abstraction has 13 states and 15 transitions. [2022-11-20 21:12:53,222 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) [2022-11-20 21:12:53,222 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 15 transitions. [2022-11-20 21:12:53,222 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-11-20 21:12:53,223 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:12:53,223 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 21:12:53,231 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2022-11-20 21:12:53,429 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:12:53,429 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:12:53,430 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:12:53,430 INFO L85 PathProgramCache]: Analyzing trace with hash -1928566110, now seen corresponding path program 1 times [2022-11-20 21:12:53,431 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:12:53,431 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1332425557] [2022-11-20 21:12:53,431 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:12:53,431 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:12:53,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:12:53,525 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:12:53,526 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:12:53,526 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1332425557] [2022-11-20 21:12:53,526 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1332425557] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 21:12:53,526 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1678201484] [2022-11-20 21:12:53,527 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:12:53,528 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:12:53,528 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:12:53,530 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 21:12:53,551 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-20 21:12:53,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:12:53,597 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-20 21:12:53,600 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 21:12:53,638 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:12:53,638 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 21:12:53,667 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:12:53,667 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1678201484] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 21:12:53,667 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [875970363] [2022-11-20 21:12:53,696 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-20 21:12:53,696 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 21:12:53,701 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 21:12:53,708 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 21:12:53,709 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 21:12:54,039 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 21:12:55,059 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 [2022-11-20 21:12:55,059 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 21:12:55,059 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 21:12:55,059 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 8 [2022-11-20 21:12:55,060 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1863036895] [2022-11-20 21:12:55,060 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 21:12:55,060 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-20 21:12:55,060 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:12:55,061 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-20 21:12:55,061 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=195, Unknown=0, NotChecked=0, Total=240 [2022-11-20 21:12:55,061 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) [2022-11-20 21:12:55,106 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:12:55,106 INFO L93 Difference]: Finished difference Result 22 states and 26 transitions. [2022-11-20 21:12:55,107 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-20 21:12:55,107 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 [2022-11-20 21:12:55,108 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:12:55,108 INFO L225 Difference]: With dead ends: 22 [2022-11-20 21:12:55,108 INFO L226 Difference]: Without dead ends: 14 [2022-11-20 21:12:55,109 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 75 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=45, Invalid=195, Unknown=0, NotChecked=0, Total=240 [2022-11-20 21:12:55,109 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, 0.0s IncrementalHoareTripleChecker+Time [2022-11-20 21:12:55,110 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 26 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-20 21:12:55,111 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2022-11-20 21:12:55,114 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2022-11-20 21:12:55,114 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) [2022-11-20 21:12:55,115 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2022-11-20 21:12:55,115 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 10 [2022-11-20 21:12:55,115 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:12:55,115 INFO L495 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2022-11-20 21:12:55,115 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) [2022-11-20 21:12:55,116 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2022-11-20 21:12:55,116 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-11-20 21:12:55,116 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:12:55,116 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 21:12:55,127 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-20 21:12:55,322 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:12:55,322 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:12:55,323 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:12:55,323 INFO L85 PathProgramCache]: Analyzing trace with hash 328101214, now seen corresponding path program 2 times [2022-11-20 21:12:55,323 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:12:55,323 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1981357207] [2022-11-20 21:12:55,323 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:12:55,323 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:12:55,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:12:55,555 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 21:12:55,555 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:12:55,555 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1981357207] [2022-11-20 21:12:55,556 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1981357207] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 21:12:55,556 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 21:12:55,556 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-11-20 21:12:55,556 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [756320944] [2022-11-20 21:12:55,556 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 21:12:55,557 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-20 21:12:55,557 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:12:55,557 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-20 21:12:55,557 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-11-20 21:12:55,557 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) [2022-11-20 21:12:55,601 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:12:55,601 INFO L93 Difference]: Finished difference Result 18 states and 19 transitions. [2022-11-20 21:12:55,601 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-20 21:12:55,602 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 [2022-11-20 21:12:55,602 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:12:55,602 INFO L225 Difference]: With dead ends: 18 [2022-11-20 21:12:55,602 INFO L226 Difference]: Without dead ends: 14 [2022-11-20 21:12:55,603 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 [2022-11-20 21:12:55,603 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 [2022-11-20 21:12:55,604 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] [2022-11-20 21:12:55,604 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2022-11-20 21:12:55,610 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2022-11-20 21:12:55,610 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) [2022-11-20 21:12:55,610 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2022-11-20 21:12:55,611 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 11 [2022-11-20 21:12:55,611 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:12:55,611 INFO L495 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2022-11-20 21:12:55,611 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) [2022-11-20 21:12:55,612 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2022-11-20 21:12:55,612 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-20 21:12:55,612 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:12:55,612 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 21:12:55,613 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2022-11-20 21:12:55,613 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:12:55,613 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:12:55,614 INFO L85 PathProgramCache]: Analyzing trace with hash 1827995217, now seen corresponding path program 1 times [2022-11-20 21:12:55,614 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:12:55,614 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1961273633] [2022-11-20 21:12:55,614 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:12:55,614 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:12:55,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:12:55,659 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 21:12:55,660 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:12:55,660 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1961273633] [2022-11-20 21:12:55,660 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1961273633] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 21:12:55,660 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2113391661] [2022-11-20 21:12:55,660 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:12:55,661 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:12:55,661 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:12:55,662 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 21:12:55,688 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-20 21:12:55,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:12:55,720 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-20 21:12:55,721 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 21:12:55,750 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 21:12:55,750 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 21:12:55,771 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 21:12:55,772 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2113391661] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 21:12:55,772 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1061653701] [2022-11-20 21:12:55,774 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-20 21:12:55,774 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 21:12:55,775 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 21:12:55,775 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 21:12:55,775 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 21:12:56,004 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 21:12:56,985 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 [2022-11-20 21:12:56,985 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 21:12:56,986 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 21:12:56,986 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 8 [2022-11-20 21:12:56,986 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [277020674] [2022-11-20 21:12:56,986 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 21:12:56,986 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-20 21:12:56,987 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:12:56,987 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-20 21:12:56,987 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=225, Unknown=0, NotChecked=0, Total=272 [2022-11-20 21:12:56,988 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) [2022-11-20 21:12:57,025 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:12:57,025 INFO L93 Difference]: Finished difference Result 19 states and 20 transitions. [2022-11-20 21:12:57,027 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-20 21:12:57,027 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 [2022-11-20 21:12:57,028 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:12:57,028 INFO L225 Difference]: With dead ends: 19 [2022-11-20 21:12:57,028 INFO L226 Difference]: Without dead ends: 15 [2022-11-20 21:12:57,029 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 84 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=47, Invalid=225, Unknown=0, NotChecked=0, Total=272 [2022-11-20 21:12:57,029 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 [2022-11-20 21:12:57,030 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] [2022-11-20 21:12:57,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2022-11-20 21:12:57,035 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2022-11-20 21:12:57,036 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) [2022-11-20 21:12:57,036 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2022-11-20 21:12:57,036 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 13 [2022-11-20 21:12:57,036 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:12:57,037 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2022-11-20 21:12:57,037 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) [2022-11-20 21:12:57,037 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2022-11-20 21:12:57,037 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-11-20 21:12:57,038 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:12:57,038 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 21:12:57,048 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-20 21:12:57,243 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2022-11-20 21:12:57,243 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:12:57,243 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:12:57,244 INFO L85 PathProgramCache]: Analyzing trace with hash 823375698, now seen corresponding path program 2 times [2022-11-20 21:12:57,244 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:12:57,244 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [265381725] [2022-11-20 21:12:57,244 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:12:57,244 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:12:57,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:12:57,584 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:12:57,585 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:12:57,585 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [265381725] [2022-11-20 21:12:57,585 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [265381725] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 21:12:57,585 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1871042399] [2022-11-20 21:12:57,585 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 21:12:57,585 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:12:57,586 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:12:57,587 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 21:12:57,611 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-20 21:12:57,652 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-20 21:12:57,653 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 21:12:57,654 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 30 conjunts are in the unsatisfiable core [2022-11-20 21:12:57,655 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 21:12:57,867 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:12:57,867 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 21:12:58,142 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:12:58,142 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1871042399] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 21:12:58,142 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [408696242] [2022-11-20 21:12:58,155 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-20 21:12:58,155 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 21:12:58,156 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 21:12:58,158 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 21:12:58,158 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 21:12:58,397 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 21:12:59,355 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 [2022-11-20 21:12:59,355 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 21:12:59,355 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 21:12:59,356 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 24 [2022-11-20 21:12:59,356 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1101100305] [2022-11-20 21:12:59,356 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 21:12:59,356 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-11-20 21:12:59,356 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:12:59,357 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-11-20 21:12:59,357 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=918, Unknown=0, NotChecked=0, Total=1056 [2022-11-20 21:12:59,357 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) [2022-11-20 21:12:59,600 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:12:59,600 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2022-11-20 21:12:59,601 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-20 21:12:59,602 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 [2022-11-20 21:12:59,602 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:12:59,602 INFO L225 Difference]: With dead ends: 30 [2022-11-20 21:12:59,602 INFO L226 Difference]: Without dead ends: 26 [2022-11-20 21:12:59,603 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 599 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=204, Invalid=1202, Unknown=0, NotChecked=0, Total=1406 [2022-11-20 21:12:59,604 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 [2022-11-20 21:12:59,604 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] [2022-11-20 21:12:59,605 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2022-11-20 21:12:59,614 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 19. [2022-11-20 21:12:59,614 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) [2022-11-20 21:12:59,615 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2022-11-20 21:12:59,615 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 14 [2022-11-20 21:12:59,616 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:12:59,616 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2022-11-20 21:12:59,616 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) [2022-11-20 21:12:59,616 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2022-11-20 21:12:59,617 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-11-20 21:12:59,617 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:12:59,617 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 21:12:59,628 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-20 21:12:59,823 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2022-11-20 21:12:59,824 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:12:59,824 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:12:59,824 INFO L85 PathProgramCache]: Analyzing trace with hash -255058319, now seen corresponding path program 3 times [2022-11-20 21:12:59,824 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:12:59,824 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1331764524] [2022-11-20 21:12:59,824 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:12:59,825 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:12:59,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:13:00,095 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:13:00,096 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:13:00,096 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1331764524] [2022-11-20 21:13:00,096 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1331764524] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 21:13:00,096 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [841095344] [2022-11-20 21:13:00,096 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-20 21:13:00,096 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:13:00,096 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:13:00,098 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 21:13:00,131 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-20 21:13:00,160 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-20 21:13:00,160 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 21:13:00,161 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-20 21:13:00,163 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 21:13:00,479 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:13:00,479 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 21:13:00,713 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:13:00,713 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [841095344] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 21:13:00,713 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [33682388] [2022-11-20 21:13:00,715 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-20 21:13:00,715 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 21:13:00,716 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 21:13:00,716 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 21:13:00,716 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 21:13:00,901 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 21:13:01,904 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 [2022-11-20 21:13:01,904 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 21:13:01,904 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 21:13:01,904 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 23 [2022-11-20 21:13:01,904 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1101760259] [2022-11-20 21:13:01,905 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 21:13:01,905 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-11-20 21:13:01,905 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:13:01,905 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-11-20 21:13:01,906 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=850, Unknown=0, NotChecked=0, Total=992 [2022-11-20 21:13:01,906 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) [2022-11-20 21:13:02,301 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:13:02,301 INFO L93 Difference]: Finished difference Result 26 states and 28 transitions. [2022-11-20 21:13:02,302 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-20 21:13:02,302 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 [2022-11-20 21:13:02,302 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:13:02,303 INFO L225 Difference]: With dead ends: 26 [2022-11-20 21:13:02,303 INFO L226 Difference]: Without dead ends: 16 [2022-11-20 21:13:02,304 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 19 SyntacticMatches, 5 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 522 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=231, Invalid=1175, Unknown=0, NotChecked=0, Total=1406 [2022-11-20 21:13:02,307 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 [2022-11-20 21:13:02,307 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] [2022-11-20 21:13:02,308 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2022-11-20 21:13:02,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2022-11-20 21:13:02,323 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) [2022-11-20 21:13:02,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2022-11-20 21:13:02,325 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 15 [2022-11-20 21:13:02,325 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:13:02,326 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2022-11-20 21:13:02,328 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) [2022-11-20 21:13:02,328 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2022-11-20 21:13:02,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-11-20 21:13:02,329 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:13:02,329 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 21:13:02,340 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-20 21:13:02,534 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:13:02,534 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:13:02,535 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:13:02,535 INFO L85 PathProgramCache]: Analyzing trace with hash -853672946, now seen corresponding path program 4 times [2022-11-20 21:13:02,535 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:13:02,535 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [534277079] [2022-11-20 21:13:02,535 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:13:02,535 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:13:02,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:13:02,833 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:13:02,833 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:13:02,833 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [534277079] [2022-11-20 21:13:02,833 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [534277079] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 21:13:02,833 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [133826370] [2022-11-20 21:13:02,834 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-20 21:13:02,834 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:13:02,834 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:13:02,839 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 21:13:02,859 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-20 21:13:02,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:13:02,888 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-20 21:13:02,889 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 21:13:03,184 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:13:03,184 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 21:13:03,409 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:13:03,409 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [133826370] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 21:13:03,410 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [198189849] [2022-11-20 21:13:03,411 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-20 21:13:03,412 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 21:13:03,412 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 21:13:03,412 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 21:13:03,412 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 21:13:03,631 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 21:13:04,602 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 [2022-11-20 21:13:04,602 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 21:13:04,602 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 21:13:04,602 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11, 11] total 24 [2022-11-20 21:13:04,603 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2004666254] [2022-11-20 21:13:04,603 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 21:13:04,603 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-11-20 21:13:04,603 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:13:04,604 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-11-20 21:13:04,604 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=150, Invalid=906, Unknown=0, NotChecked=0, Total=1056 [2022-11-20 21:13:04,605 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) [2022-11-20 21:13:04,925 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:13:04,925 INFO L93 Difference]: Finished difference Result 21 states and 22 transitions. [2022-11-20 21:13:04,926 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-20 21:13:04,926 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 [2022-11-20 21:13:04,926 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:13:04,927 INFO L225 Difference]: With dead ends: 21 [2022-11-20 21:13:04,927 INFO L226 Difference]: Without dead ends: 17 [2022-11-20 21:13:04,928 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 19 SyntacticMatches, 5 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 562 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=252, Invalid=1154, Unknown=0, NotChecked=0, Total=1406 [2022-11-20 21:13:04,928 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 [2022-11-20 21:13:04,929 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] [2022-11-20 21:13:04,929 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2022-11-20 21:13:04,958 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2022-11-20 21:13:04,958 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) [2022-11-20 21:13:04,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2022-11-20 21:13:04,959 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 15 [2022-11-20 21:13:04,959 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:13:04,959 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2022-11-20 21:13:04,960 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) [2022-11-20 21:13:04,960 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2022-11-20 21:13:04,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-11-20 21:13:04,960 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:13:04,961 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 21:13:04,972 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-20 21:13:05,166 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-11-20 21:13:05,167 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:13:05,167 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:13:05,167 INFO L85 PathProgramCache]: Analyzing trace with hash -703958731, now seen corresponding path program 5 times [2022-11-20 21:13:05,168 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:13:05,168 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1751037912] [2022-11-20 21:13:05,168 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:13:05,168 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:13:05,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:13:05,829 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:13:05,829 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:13:05,829 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1751037912] [2022-11-20 21:13:05,830 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1751037912] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 21:13:05,830 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [600020371] [2022-11-20 21:13:05,830 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 21:13:05,830 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:13:05,830 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:13:05,832 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 21:13:05,841 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-20 21:13:05,903 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-20 21:13:05,903 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 21:13:05,905 WARN L261 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 48 conjunts are in the unsatisfiable core [2022-11-20 21:13:05,907 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 21:13:07,701 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:13:07,702 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 21:13:08,751 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:13:08,751 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [600020371] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 21:13:08,752 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1069868583] [2022-11-20 21:13:08,759 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-20 21:13:08,759 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 21:13:08,760 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 21:13:08,760 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 21:13:08,760 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 21:13:09,011 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 21:13:10,437 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 [2022-11-20 21:13:10,437 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 21:13:10,437 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 21:13:10,437 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 40 [2022-11-20 21:13:10,437 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2139471262] [2022-11-20 21:13:10,437 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 21:13:10,438 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-11-20 21:13:10,438 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:13:10,439 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-11-20 21:13:10,440 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=2186, Unknown=0, NotChecked=0, Total=2352 [2022-11-20 21:13:10,440 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) [2022-11-20 21:13:12,535 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:13:12,535 INFO L93 Difference]: Finished difference Result 31 states and 34 transitions. [2022-11-20 21:13:12,539 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-11-20 21:13:12,539 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 [2022-11-20 21:13:12,540 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:13:12,540 INFO L225 Difference]: With dead ends: 31 [2022-11-20 21:13:12,540 INFO L226 Difference]: Without dead ends: 18 [2022-11-20 21:13:12,542 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 786 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=290, Invalid=3016, Unknown=0, NotChecked=0, Total=3306 [2022-11-20 21:13:12,542 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 83 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 404 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s 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, 0.3s IncrementalHoareTripleChecker+Time [2022-11-20 21:13:12,542 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [83 Valid, 52 Invalid, 412 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 404 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-20 21:13:12,543 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2022-11-20 21:13:12,550 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2022-11-20 21:13:12,550 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) [2022-11-20 21:13:12,551 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2022-11-20 21:13:12,551 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 16 [2022-11-20 21:13:12,551 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:13:12,551 INFO L495 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2022-11-20 21:13:12,552 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) [2022-11-20 21:13:12,552 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2022-11-20 21:13:12,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-11-20 21:13:12,552 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:13:12,552 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 21:13:12,559 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-20 21:13:12,758 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:13:12,758 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:13:12,758 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:13:12,758 INFO L85 PathProgramCache]: Analyzing trace with hash -1734969615, now seen corresponding path program 6 times [2022-11-20 21:13:12,759 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:13:12,759 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [735021762] [2022-11-20 21:13:12,759 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:13:12,759 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:13:12,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:13:13,124 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:13:13,124 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:13:13,124 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [735021762] [2022-11-20 21:13:13,124 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [735021762] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 21:13:13,125 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [625241967] [2022-11-20 21:13:13,125 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-20 21:13:13,125 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:13:13,125 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:13:13,126 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 21:13:13,132 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-20 21:13:13,186 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-20 21:13:13,187 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 21:13:13,187 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 14 conjunts are in the unsatisfiable core [2022-11-20 21:13:13,189 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 21:13:13,520 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:13:13,520 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 21:13:13,806 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:13:13,807 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [625241967] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 21:13:13,807 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1141394689] [2022-11-20 21:13:13,809 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-20 21:13:13,809 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 21:13:13,809 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 21:13:13,810 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 21:13:13,810 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 21:13:14,047 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 21:13:15,084 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 [2022-11-20 21:13:15,084 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 21:13:15,085 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 21:13:15,085 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 13] total 29 [2022-11-20 21:13:15,085 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [499265069] [2022-11-20 21:13:15,085 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 21:13:15,085 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-11-20 21:13:15,086 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:13:15,086 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-11-20 21:13:15,087 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=202, Invalid=1204, Unknown=0, NotChecked=0, Total=1406 [2022-11-20 21:13:15,087 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) [2022-11-20 21:13:15,445 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:13:15,445 INFO L93 Difference]: Finished difference Result 23 states and 24 transitions. [2022-11-20 21:13:15,446 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-20 21:13:15,446 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 [2022-11-20 21:13:15,446 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:13:15,446 INFO L225 Difference]: With dead ends: 23 [2022-11-20 21:13:15,446 INFO L226 Difference]: Without dead ends: 19 [2022-11-20 21:13:15,447 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 21 SyntacticMatches, 6 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 809 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=351, Invalid=1541, Unknown=0, NotChecked=0, Total=1892 [2022-11-20 21:13:15,448 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 [2022-11-20 21:13:15,448 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] [2022-11-20 21:13:15,449 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2022-11-20 21:13:15,458 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2022-11-20 21:13:15,458 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) [2022-11-20 21:13:15,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2022-11-20 21:13:15,459 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 17 [2022-11-20 21:13:15,459 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:13:15,459 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2022-11-20 21:13:15,460 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) [2022-11-20 21:13:15,460 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2022-11-20 21:13:15,460 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-11-20 21:13:15,460 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:13:15,460 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 21:13:15,471 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-20 21:13:15,661 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-11-20 21:13:15,661 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:13:15,661 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:13:15,661 INFO L85 PathProgramCache]: Analyzing trace with hash 2040615602, now seen corresponding path program 7 times [2022-11-20 21:13:15,662 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:13:15,662 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [349956905] [2022-11-20 21:13:15,662 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:13:15,662 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:13:15,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:13:16,696 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:13:16,696 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:13:16,696 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [349956905] [2022-11-20 21:13:16,696 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [349956905] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 21:13:16,696 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [704431251] [2022-11-20 21:13:16,696 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-20 21:13:16,696 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:13:16,697 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:13:16,698 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 21:13:16,702 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-20 21:13:16,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:13:16,750 WARN L261 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 50 conjunts are in the unsatisfiable core [2022-11-20 21:13:16,751 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 21:13:18,510 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:13:18,510 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 21:13:19,408 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:13:19,409 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [704431251] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 21:13:19,409 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1296100945] [2022-11-20 21:13:19,410 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-20 21:13:19,411 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 21:13:19,411 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 21:13:19,411 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 21:13:19,411 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 21:13:19,555 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 21:13:21,040 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 [2022-11-20 21:13:21,041 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 21:13:21,041 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 21:13:21,041 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 45 [2022-11-20 21:13:21,041 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [710679645] [2022-11-20 21:13:21,041 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 21:13:21,042 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2022-11-20 21:13:21,042 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:13:21,042 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2022-11-20 21:13:21,043 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=187, Invalid=2675, Unknown=0, NotChecked=0, Total=2862 [2022-11-20 21:13:21,043 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) [2022-11-20 21:13:24,416 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:13:24,416 INFO L93 Difference]: Finished difference Result 34 states and 37 transitions. [2022-11-20 21:13:24,416 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-11-20 21:13:24,417 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 [2022-11-20 21:13:24,417 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:13:24,417 INFO L225 Difference]: With dead ends: 34 [2022-11-20 21:13:24,417 INFO L226 Difference]: Without dead ends: 20 [2022-11-20 21:13:24,419 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1010 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=377, Invalid=3913, Unknown=0, NotChecked=0, Total=4290 [2022-11-20 21:13:24,419 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 [2022-11-20 21:13:24,420 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] [2022-11-20 21:13:24,420 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2022-11-20 21:13:24,429 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2022-11-20 21:13:24,429 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) [2022-11-20 21:13:24,430 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2022-11-20 21:13:24,430 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 18 [2022-11-20 21:13:24,430 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:13:24,430 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2022-11-20 21:13:24,431 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) [2022-11-20 21:13:24,431 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2022-11-20 21:13:24,431 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-11-20 21:13:24,431 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:13:24,431 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 21:13:24,439 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-20 21:13:24,639 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:13:24,640 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:13:24,640 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:13:24,640 INFO L85 PathProgramCache]: Analyzing trace with hash -918365842, now seen corresponding path program 8 times [2022-11-20 21:13:24,640 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:13:24,640 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [428727564] [2022-11-20 21:13:24,640 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:13:24,641 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:13:24,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:13:25,062 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 6 proven. 19 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:13:25,062 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:13:25,062 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [428727564] [2022-11-20 21:13:25,062 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [428727564] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 21:13:25,062 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [9763941] [2022-11-20 21:13:25,063 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 21:13:25,063 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:13:25,063 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:13:25,064 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 21:13:25,099 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-20 21:13:25,124 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-20 21:13:25,124 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 21:13:25,125 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 16 conjunts are in the unsatisfiable core [2022-11-20 21:13:25,127 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 21:13:25,526 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:13:25,526 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 21:13:25,866 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:13:25,866 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [9763941] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 21:13:25,867 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [963229967] [2022-11-20 21:13:25,868 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-20 21:13:25,869 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 21:13:25,869 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 21:13:25,869 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 21:13:25,869 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 21:13:26,029 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 21:13:27,054 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 [2022-11-20 21:13:27,055 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 21:13:27,057 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 21:13:27,057 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 15] total 34 [2022-11-20 21:13:27,057 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [349462836] [2022-11-20 21:13:27,057 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 21:13:27,057 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2022-11-20 21:13:27,058 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:13:27,058 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2022-11-20 21:13:27,059 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=263, Invalid=1543, Unknown=0, NotChecked=0, Total=1806 [2022-11-20 21:13:27,059 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) [2022-11-20 21:13:27,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:13:27,471 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2022-11-20 21:13:27,472 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-11-20 21:13:27,472 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 [2022-11-20 21:13:27,472 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:13:27,472 INFO L225 Difference]: With dead ends: 25 [2022-11-20 21:13:27,472 INFO L226 Difference]: Without dead ends: 21 [2022-11-20 21:13:27,473 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 23 SyntacticMatches, 7 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1097 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=468, Invalid=1982, Unknown=0, NotChecked=0, Total=2450 [2022-11-20 21:13:27,474 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 [2022-11-20 21:13:27,474 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] [2022-11-20 21:13:27,475 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2022-11-20 21:13:27,484 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2022-11-20 21:13:27,484 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) [2022-11-20 21:13:27,485 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2022-11-20 21:13:27,485 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 19 [2022-11-20 21:13:27,485 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:13:27,486 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2022-11-20 21:13:27,486 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) [2022-11-20 21:13:27,486 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2022-11-20 21:13:27,486 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-11-20 21:13:27,487 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:13:27,487 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 21:13:27,503 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-20 21:13:27,699 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:13:27,699 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:13:27,700 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:13:27,700 INFO L85 PathProgramCache]: Analyzing trace with hash 1585528789, now seen corresponding path program 9 times [2022-11-20 21:13:27,700 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:13:27,700 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1015788831] [2022-11-20 21:13:27,700 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:13:27,700 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:13:27,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:13:28,519 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:13:28,520 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:13:28,520 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1015788831] [2022-11-20 21:13:28,520 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1015788831] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 21:13:28,520 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [341100919] [2022-11-20 21:13:28,520 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-20 21:13:28,520 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:13:28,521 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:13:28,522 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 21:13:28,524 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-20 21:13:28,571 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-20 21:13:28,571 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 21:13:28,573 WARN L261 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 56 conjunts are in the unsatisfiable core [2022-11-20 21:13:28,575 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 21:13:30,440 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:13:30,440 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 21:13:31,690 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:13:31,691 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [341100919] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 21:13:31,691 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [943219524] [2022-11-20 21:13:31,692 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-20 21:13:31,692 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 21:13:31,695 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 21:13:31,695 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 21:13:31,695 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 21:13:31,836 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 21:13:33,468 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 [2022-11-20 21:13:33,469 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 21:13:33,469 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 21:13:33,469 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 52 [2022-11-20 21:13:33,469 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1859392716] [2022-11-20 21:13:33,469 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 21:13:33,470 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2022-11-20 21:13:33,470 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:13:33,470 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2022-11-20 21:13:33,472 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=214, Invalid=3446, Unknown=0, NotChecked=0, Total=3660 [2022-11-20 21:13:33,472 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) [2022-11-20 21:13:36,503 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:13:36,503 INFO L93 Difference]: Finished difference Result 37 states and 40 transitions. [2022-11-20 21:13:36,507 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-11-20 21:13:36,507 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 [2022-11-20 21:13:36,508 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:13:36,508 INFO L225 Difference]: With dead ends: 37 [2022-11-20 21:13:36,508 INFO L226 Difference]: Without dead ends: 22 [2022-11-20 21:13:36,510 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1284 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=370, Invalid=4742, Unknown=0, NotChecked=0, Total=5112 [2022-11-20 21:13:36,510 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 [2022-11-20 21:13:36,510 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] [2022-11-20 21:13:36,511 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2022-11-20 21:13:36,520 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2022-11-20 21:13:36,521 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) [2022-11-20 21:13:36,521 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 23 transitions. [2022-11-20 21:13:36,521 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 23 transitions. Word has length 20 [2022-11-20 21:13:36,521 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:13:36,522 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 23 transitions. [2022-11-20 21:13:36,522 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) [2022-11-20 21:13:36,522 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 23 transitions. [2022-11-20 21:13:36,522 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-11-20 21:13:36,523 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:13:36,523 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 21:13:36,527 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-11-20 21:13:36,727 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-11-20 21:13:36,727 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:13:36,728 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:13:36,728 INFO L85 PathProgramCache]: Analyzing trace with hash 1272711057, now seen corresponding path program 10 times [2022-11-20 21:13:36,728 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:13:36,728 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [462050085] [2022-11-20 21:13:36,728 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:13:36,728 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:13:36,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:13:37,194 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 10 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:13:37,194 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:13:37,194 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [462050085] [2022-11-20 21:13:37,195 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [462050085] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 21:13:37,195 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [70434101] [2022-11-20 21:13:37,195 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-20 21:13:37,195 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:13:37,195 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:13:37,198 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 21:13:37,200 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-20 21:13:37,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:13:37,251 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-20 21:13:37,253 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 21:13:37,724 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 15 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:13:37,724 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 21:13:38,143 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:13:38,143 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [70434101] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 21:13:38,143 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2141608555] [2022-11-20 21:13:38,145 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-20 21:13:38,145 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 21:13:38,145 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 21:13:38,145 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 21:13:38,146 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 21:13:38,280 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 21:13:39,346 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 [2022-11-20 21:13:39,346 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 21:13:39,346 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 21:13:39,346 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17, 17] total 39 [2022-11-20 21:13:39,346 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [841563251] [2022-11-20 21:13:39,347 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 21:13:39,347 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2022-11-20 21:13:39,347 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:13:39,348 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2022-11-20 21:13:39,349 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=333, Invalid=1923, Unknown=0, NotChecked=0, Total=2256 [2022-11-20 21:13:39,349 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) [2022-11-20 21:13:39,881 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:13:39,881 INFO L93 Difference]: Finished difference Result 27 states and 28 transitions. [2022-11-20 21:13:39,881 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-11-20 21:13:39,881 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 [2022-11-20 21:13:39,882 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:13:39,882 INFO L225 Difference]: With dead ends: 27 [2022-11-20 21:13:39,882 INFO L226 Difference]: Without dead ends: 23 [2022-11-20 21:13:39,883 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 25 SyntacticMatches, 8 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1426 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=603, Invalid=2477, Unknown=0, NotChecked=0, Total=3080 [2022-11-20 21:13:39,884 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 [2022-11-20 21:13:39,884 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] [2022-11-20 21:13:39,885 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2022-11-20 21:13:39,898 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2022-11-20 21:13:39,898 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) [2022-11-20 21:13:39,899 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2022-11-20 21:13:39,899 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 21 [2022-11-20 21:13:39,899 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:13:39,900 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2022-11-20 21:13:39,900 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) [2022-11-20 21:13:39,900 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2022-11-20 21:13:39,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-11-20 21:13:39,907 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:13:39,908 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 21:13:39,919 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-20 21:13:40,114 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-11-20 21:13:40,114 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:13:40,114 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:13:40,114 INFO L85 PathProgramCache]: Analyzing trace with hash 789435922, now seen corresponding path program 11 times [2022-11-20 21:13:40,115 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:13:40,115 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1976223152] [2022-11-20 21:13:40,115 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:13:40,115 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:13:40,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:13:41,111 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:13:41,111 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:13:41,111 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1976223152] [2022-11-20 21:13:41,111 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1976223152] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 21:13:41,111 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1858460690] [2022-11-20 21:13:41,112 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 21:13:41,112 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:13:41,112 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:13:41,113 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 21:13:41,139 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-20 21:13:41,179 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-20 21:13:41,180 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 21:13:41,182 WARN L261 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 60 conjunts are in the unsatisfiable core [2022-11-20 21:13:41,183 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 21:13:43,415 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:13:43,415 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 21:13:44,895 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:13:44,895 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1858460690] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 21:13:44,896 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1142621783] [2022-11-20 21:13:44,897 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-20 21:13:44,898 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 21:13:44,898 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 21:13:44,898 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 21:13:44,898 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 21:13:45,032 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 21:13:46,943 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 [2022-11-20 21:13:46,944 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 21:13:46,944 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 21:13:46,944 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 58 [2022-11-20 21:13:46,944 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [440200219] [2022-11-20 21:13:46,945 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 21:13:46,945 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2022-11-20 21:13:46,945 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:13:46,946 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2022-11-20 21:13:46,947 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=238, Invalid=4184, Unknown=0, NotChecked=0, Total=4422 [2022-11-20 21:13:46,947 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) [2022-11-20 21:13:50,377 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:13:50,378 INFO L93 Difference]: Finished difference Result 40 states and 43 transitions. [2022-11-20 21:13:50,378 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-11-20 21:13:50,378 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 [2022-11-20 21:13:50,378 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:13:50,379 INFO L225 Difference]: With dead ends: 40 [2022-11-20 21:13:50,379 INFO L226 Difference]: Without dead ends: 24 [2022-11-20 21:13:50,380 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1575 ImplicationChecksByTransitivity, 7.9s TimeCoverageRelationStatistics Valid=410, Invalid=5752, Unknown=0, NotChecked=0, Total=6162 [2022-11-20 21:13:50,381 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 96 mSDsluCounter, 73 mSDsCounter, 0 mSdLazyCounter, 798 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s 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, 0.6s IncrementalHoareTripleChecker+Time [2022-11-20 21:13:50,381 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [96 Valid, 75 Invalid, 806 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 798 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-20 21:13:50,382 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2022-11-20 21:13:50,390 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2022-11-20 21:13:50,390 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) [2022-11-20 21:13:50,391 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2022-11-20 21:13:50,391 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 22 [2022-11-20 21:13:50,392 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:13:50,392 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2022-11-20 21:13:50,392 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) [2022-11-20 21:13:50,392 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2022-11-20 21:13:50,394 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-11-20 21:13:50,394 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:13:50,394 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 21:13:50,399 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-11-20 21:13:50,595 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:13:50,595 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:13:50,596 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:13:50,596 INFO L85 PathProgramCache]: Analyzing trace with hash 819306190, now seen corresponding path program 12 times [2022-11-20 21:13:50,596 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:13:50,596 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1988034085] [2022-11-20 21:13:50,596 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:13:50,596 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:13:50,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:13:51,208 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 15 proven. 34 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:13:51,208 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:13:51,208 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1988034085] [2022-11-20 21:13:51,209 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1988034085] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 21:13:51,209 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [432964606] [2022-11-20 21:13:51,209 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-20 21:13:51,209 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:13:51,209 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:13:51,211 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 21:13:51,213 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-20 21:13:51,257 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-20 21:13:51,258 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 21:13:51,259 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-20 21:13:51,260 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 21:13:51,806 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 21 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:13:51,806 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 21:13:52,321 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:13:52,321 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [432964606] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 21:13:52,321 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [396402262] [2022-11-20 21:13:52,323 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-20 21:13:52,323 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 21:13:52,324 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 21:13:52,324 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 21:13:52,324 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 21:13:52,500 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 21:13:53,595 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 [2022-11-20 21:13:53,595 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 21:13:53,595 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 21:13:53,596 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19, 19] total 44 [2022-11-20 21:13:53,596 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [945425802] [2022-11-20 21:13:53,596 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 21:13:53,596 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2022-11-20 21:13:53,596 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:13:53,596 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2022-11-20 21:13:53,597 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=412, Invalid=2344, Unknown=0, NotChecked=0, Total=2756 [2022-11-20 21:13:53,597 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) [2022-11-20 21:13:54,146 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:13:54,146 INFO L93 Difference]: Finished difference Result 29 states and 30 transitions. [2022-11-20 21:13:54,146 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-11-20 21:13:54,147 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 [2022-11-20 21:13:54,147 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:13:54,147 INFO L225 Difference]: With dead ends: 29 [2022-11-20 21:13:54,147 INFO L226 Difference]: Without dead ends: 25 [2022-11-20 21:13:54,149 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 [2022-11-20 21:13:54,149 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 [2022-11-20 21:13:54,150 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] [2022-11-20 21:13:54,150 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2022-11-20 21:13:54,165 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2022-11-20 21:13:54,165 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) [2022-11-20 21:13:54,166 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2022-11-20 21:13:54,166 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 23 [2022-11-20 21:13:54,166 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:13:54,166 INFO L495 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2022-11-20 21:13:54,167 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) [2022-11-20 21:13:54,167 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2022-11-20 21:13:54,167 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-11-20 21:13:54,167 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:13:54,168 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 21:13:54,176 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-11-20 21:13:54,373 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-11-20 21:13:54,373 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:13:54,374 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:13:54,374 INFO L85 PathProgramCache]: Analyzing trace with hash -381213067, now seen corresponding path program 13 times [2022-11-20 21:13:54,374 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:13:54,374 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1897625806] [2022-11-20 21:13:54,374 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:13:54,374 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:13:54,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:13:55,433 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:13:55,434 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:13:55,434 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1897625806] [2022-11-20 21:13:55,434 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1897625806] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 21:13:55,434 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1939309425] [2022-11-20 21:13:55,434 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-20 21:13:55,434 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:13:55,434 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:13:55,435 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 21:13:55,438 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-20 21:13:55,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:13:55,482 WARN L261 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 62 conjunts are in the unsatisfiable core [2022-11-20 21:13:55,483 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 21:13:58,018 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:13:58,018 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 21:13:59,926 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:13:59,927 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1939309425] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 21:13:59,927 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1660289173] [2022-11-20 21:13:59,928 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-20 21:13:59,929 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 21:13:59,929 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 21:13:59,929 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 21:13:59,929 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 21:14:00,064 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 21:14:01,721 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 [2022-11-20 21:14:01,722 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 21:14:01,722 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 21:14:01,722 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 63 [2022-11-20 21:14:01,722 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1988047326] [2022-11-20 21:14:01,723 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 21:14:01,723 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 63 states [2022-11-20 21:14:01,723 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:14:01,724 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2022-11-20 21:14:01,725 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=259, Invalid=4853, Unknown=0, NotChecked=0, Total=5112 [2022-11-20 21:14:01,725 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) [2022-11-20 21:14:07,196 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:14:07,197 INFO L93 Difference]: Finished difference Result 43 states and 46 transitions. [2022-11-20 21:14:07,197 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-11-20 21:14:07,197 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 [2022-11-20 21:14:07,197 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:14:07,198 INFO L225 Difference]: With dead ends: 43 [2022-11-20 21:14:07,198 INFO L226 Difference]: Without dead ends: 26 [2022-11-20 21:14:07,199 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1901 ImplicationChecksByTransitivity, 10.2s TimeCoverageRelationStatistics Valid=509, Invalid=6973, Unknown=0, NotChecked=0, Total=7482 [2022-11-20 21:14:07,200 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 146 mSDsluCounter, 84 mSDsCounter, 0 mSdLazyCounter, 1037 mSolverCounterSat, 40 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s 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, 0.9s IncrementalHoareTripleChecker+Time [2022-11-20 21:14:07,200 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [146 Valid, 86 Invalid, 1077 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 1037 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-11-20 21:14:07,201 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2022-11-20 21:14:07,211 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2022-11-20 21:14:07,211 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) [2022-11-20 21:14:07,212 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 27 transitions. [2022-11-20 21:14:07,212 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 27 transitions. Word has length 24 [2022-11-20 21:14:07,212 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:14:07,212 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 27 transitions. [2022-11-20 21:14:07,213 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 63 states, 63 states have (on average 1.0634920634920635) internal successors, (67), 63 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 21:14:07,213 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 27 transitions. [2022-11-20 21:14:07,213 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-11-20 21:14:07,213 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:14:07,213 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 21:14:07,218 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-11-20 21:14:07,414 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:14:07,414 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:14:07,414 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:14:07,415 INFO L85 PathProgramCache]: Analyzing trace with hash -1740656591, now seen corresponding path program 14 times [2022-11-20 21:14:07,415 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:14:07,415 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1660887572] [2022-11-20 21:14:07,415 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:14:07,415 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:14:07,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:14:08,075 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 21 proven. 43 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:14:08,075 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:14:08,076 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1660887572] [2022-11-20 21:14:08,077 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1660887572] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 21:14:08,077 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1288878013] [2022-11-20 21:14:08,077 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 21:14:08,077 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:14:08,077 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:14:08,078 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 21:14:08,081 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-11-20 21:14:08,128 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-11-20 21:14:08,129 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 21:14:08,130 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 22 conjunts are in the unsatisfiable core [2022-11-20 21:14:08,131 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 21:14:08,745 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 28 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:14:08,745 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 21:14:09,314 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 36 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:14:09,314 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1288878013] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 21:14:09,314 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1698694871] [2022-11-20 21:14:09,316 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-20 21:14:09,316 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 21:14:09,316 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 21:14:09,317 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 21:14:09,317 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 21:14:09,447 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 21:14:10,515 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 [2022-11-20 21:14:10,515 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 21:14:10,516 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 21:14:10,516 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21, 21] total 49 [2022-11-20 21:14:10,516 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [630831291] [2022-11-20 21:14:10,516 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 21:14:10,516 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2022-11-20 21:14:10,517 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:14:10,517 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2022-11-20 21:14:10,517 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=500, Invalid=2806, Unknown=0, NotChecked=0, Total=3306 [2022-11-20 21:14:10,518 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) [2022-11-20 21:14:11,239 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:14:11,239 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2022-11-20 21:14:11,240 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-11-20 21:14:11,240 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 [2022-11-20 21:14:11,240 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:14:11,241 INFO L225 Difference]: With dead ends: 31 [2022-11-20 21:14:11,241 INFO L226 Difference]: Without dead ends: 27 [2022-11-20 21:14:11,242 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 29 SyntacticMatches, 10 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2207 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=927, Invalid=3629, Unknown=0, NotChecked=0, Total=4556 [2022-11-20 21:14:11,242 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 100 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 229 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s 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 [2022-11-20 21:14:11,243 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] [2022-11-20 21:14:11,243 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2022-11-20 21:14:11,259 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2022-11-20 21:14:11,259 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) [2022-11-20 21:14:11,260 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2022-11-20 21:14:11,260 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 25 [2022-11-20 21:14:11,260 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:14:11,261 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2022-11-20 21:14:11,261 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) [2022-11-20 21:14:11,261 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2022-11-20 21:14:11,262 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-11-20 21:14:11,262 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:14:11,262 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 21:14:11,273 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-11-20 21:14:11,467 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:14:11,468 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:14:11,468 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:14:11,468 INFO L85 PathProgramCache]: Analyzing trace with hash 1864319346, now seen corresponding path program 15 times [2022-11-20 21:14:11,468 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:14:11,469 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1737660467] [2022-11-20 21:14:11,469 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:14:11,469 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:14:11,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:14:12,794 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:14:12,794 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:14:12,794 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1737660467] [2022-11-20 21:14:12,794 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1737660467] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 21:14:12,794 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1931906487] [2022-11-20 21:14:12,795 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-20 21:14:12,795 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:14:12,795 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:14:12,796 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 21:14:12,798 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-11-20 21:14:12,842 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-20 21:14:12,842 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 21:14:12,844 WARN L261 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 68 conjunts are in the unsatisfiable core [2022-11-20 21:14:12,846 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 21:14:15,617 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:14:15,617 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 21:14:17,719 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:14:17,720 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1931906487] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 21:14:17,720 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1724816651] [2022-11-20 21:14:17,722 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-20 21:14:17,722 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 21:14:17,722 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 21:14:17,722 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 21:14:17,723 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 21:14:17,866 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 21:14:19,686 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 [2022-11-20 21:14:19,687 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 21:14:19,687 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 21:14:19,687 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 70 [2022-11-20 21:14:19,687 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [29861098] [2022-11-20 21:14:19,687 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 21:14:19,687 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 70 states [2022-11-20 21:14:19,688 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:14:19,688 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2022-11-20 21:14:19,689 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=286, Invalid=5876, Unknown=0, NotChecked=0, Total=6162 [2022-11-20 21:14:19,689 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) [2022-11-20 21:14:24,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:14:24,096 INFO L93 Difference]: Finished difference Result 46 states and 49 transitions. [2022-11-20 21:14:24,097 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-11-20 21:14:24,097 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 [2022-11-20 21:14:24,097 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:14:24,097 INFO L225 Difference]: With dead ends: 46 [2022-11-20 21:14:24,097 INFO L226 Difference]: Without dead ends: 28 [2022-11-20 21:14:24,098 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2241 ImplicationChecksByTransitivity, 9.8s TimeCoverageRelationStatistics Valid=490, Invalid=8066, Unknown=0, NotChecked=0, Total=8556 [2022-11-20 21:14:24,099 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 105 mSDsluCounter, 85 mSDsCounter, 0 mSdLazyCounter, 1138 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s 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 [2022-11-20 21:14:24,099 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] [2022-11-20 21:14:24,100 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2022-11-20 21:14:24,116 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2022-11-20 21:14:24,116 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) [2022-11-20 21:14:24,116 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 29 transitions. [2022-11-20 21:14:24,116 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 29 transitions. Word has length 26 [2022-11-20 21:14:24,117 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:14:24,117 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 29 transitions. [2022-11-20 21:14:24,117 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) [2022-11-20 21:14:24,117 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 29 transitions. [2022-11-20 21:14:24,117 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-11-20 21:14:24,117 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:14:24,118 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 21:14:24,123 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2022-11-20 21:14:24,323 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2022-11-20 21:14:24,323 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:14:24,324 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:14:24,324 INFO L85 PathProgramCache]: Analyzing trace with hash 1109150766, now seen corresponding path program 16 times [2022-11-20 21:14:24,324 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:14:24,324 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2070499620] [2022-11-20 21:14:24,324 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:14:24,324 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:14:24,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:14:25,230 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 28 proven. 53 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:14:25,230 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:14:25,231 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2070499620] [2022-11-20 21:14:25,231 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2070499620] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 21:14:25,231 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [534053452] [2022-11-20 21:14:25,231 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-20 21:14:25,231 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:14:25,232 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:14:25,233 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 21:14:25,255 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-11-20 21:14:25,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:14:25,301 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 24 conjunts are in the unsatisfiable core [2022-11-20 21:14:25,303 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 21:14:25,968 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 36 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:14:25,968 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 21:14:26,566 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 45 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:14:26,566 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [534053452] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 21:14:26,567 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1768194197] [2022-11-20 21:14:26,568 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-20 21:14:26,568 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 21:14:26,569 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 21:14:26,569 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 21:14:26,569 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 21:14:26,705 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 21:14:27,811 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 [2022-11-20 21:14:27,811 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 21:14:27,811 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 21:14:27,811 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23, 23] total 54 [2022-11-20 21:14:27,812 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [353699644] [2022-11-20 21:14:27,812 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 21:14:27,812 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2022-11-20 21:14:27,812 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:14:27,812 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2022-11-20 21:14:27,813 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=597, Invalid=3309, Unknown=0, NotChecked=0, Total=3906 [2022-11-20 21:14:27,813 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) [2022-11-20 21:14:28,457 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:14:28,457 INFO L93 Difference]: Finished difference Result 33 states and 34 transitions. [2022-11-20 21:14:28,459 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-11-20 21:14:28,459 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 [2022-11-20 21:14:28,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:14:28,460 INFO L225 Difference]: With dead ends: 33 [2022-11-20 21:14:28,460 INFO L226 Difference]: Without dead ends: 29 [2022-11-20 21:14:28,461 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 31 SyntacticMatches, 11 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2659 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=1116, Invalid=4286, Unknown=0, NotChecked=0, Total=5402 [2022-11-20 21:14:28,461 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 [2022-11-20 21:14:28,462 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] [2022-11-20 21:14:28,462 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2022-11-20 21:14:28,478 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2022-11-20 21:14:28,478 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) [2022-11-20 21:14:28,478 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2022-11-20 21:14:28,479 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 27 [2022-11-20 21:14:28,479 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:14:28,479 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2022-11-20 21:14:28,479 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) [2022-11-20 21:14:28,479 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2022-11-20 21:14:28,480 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-11-20 21:14:28,480 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:14:28,480 INFO L195 NwaCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 21:14:28,487 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-11-20 21:14:28,685 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2022-11-20 21:14:28,685 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:14:28,686 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:14:28,686 INFO L85 PathProgramCache]: Analyzing trace with hash 14034197, now seen corresponding path program 17 times [2022-11-20 21:14:28,686 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:14:28,686 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [18366879] [2022-11-20 21:14:28,686 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:14:28,686 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:14:28,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:14:29,946 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:14:29,946 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:14:29,946 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [18366879] [2022-11-20 21:14:29,946 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [18366879] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 21:14:29,946 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1799641278] [2022-11-20 21:14:29,947 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 21:14:29,947 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:14:29,947 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:14:29,948 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 21:14:29,951 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-11-20 21:14:30,005 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-11-20 21:14:30,005 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 21:14:30,007 WARN L261 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 73 conjunts are in the unsatisfiable core [2022-11-20 21:14:30,008 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 21:14:33,283 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:14:33,283 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 21:14:35,749 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:14:35,750 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1799641278] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 21:14:35,750 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1029846174] [2022-11-20 21:14:35,751 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-20 21:14:35,751 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 21:14:35,752 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 21:14:35,752 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 21:14:35,752 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 21:14:35,884 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 21:14:37,753 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 [2022-11-20 21:14:37,753 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 21:14:37,753 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 21:14:37,754 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 76 [2022-11-20 21:14:37,754 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [235292845] [2022-11-20 21:14:37,754 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 21:14:37,754 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 76 states [2022-11-20 21:14:37,754 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:14:37,755 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2022-11-20 21:14:37,756 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=332, Invalid=6808, Unknown=0, NotChecked=0, Total=7140 [2022-11-20 21:14:37,757 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) [2022-11-20 21:14:42,490 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:14:42,490 INFO L93 Difference]: Finished difference Result 49 states and 52 transitions. [2022-11-20 21:14:42,490 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-11-20 21:14:42,490 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 [2022-11-20 21:14:42,491 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:14:42,491 INFO L225 Difference]: With dead ends: 49 [2022-11-20 21:14:42,491 INFO L226 Difference]: Without dead ends: 30 [2022-11-20 21:14:42,492 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2876 ImplicationChecksByTransitivity, 10.7s TimeCoverageRelationStatistics Valid=573, Invalid=9729, Unknown=0, NotChecked=0, Total=10302 [2022-11-20 21:14:42,493 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 135 mSDsluCounter, 96 mSDsCounter, 0 mSdLazyCounter, 1333 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s 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 [2022-11-20 21:14:42,493 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] [2022-11-20 21:14:42,494 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2022-11-20 21:14:42,511 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2022-11-20 21:14:42,511 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) [2022-11-20 21:14:42,512 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2022-11-20 21:14:42,512 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 28 [2022-11-20 21:14:42,512 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:14:42,512 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2022-11-20 21:14:42,513 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) [2022-11-20 21:14:42,513 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2022-11-20 21:14:42,513 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-11-20 21:14:42,513 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:14:42,513 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 21:14:42,519 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-11-20 21:14:42,714 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2022-11-20 21:14:42,714 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:14:42,714 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:14:42,714 INFO L85 PathProgramCache]: Analyzing trace with hash 146501841, now seen corresponding path program 18 times [2022-11-20 21:14:42,715 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:14:42,715 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [145765740] [2022-11-20 21:14:42,715 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:14:42,715 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:14:42,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:14:43,696 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 36 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:14:43,697 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:14:43,697 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [145765740] [2022-11-20 21:14:43,697 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [145765740] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 21:14:43,697 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [37157762] [2022-11-20 21:14:43,697 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-20 21:14:43,697 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:14:43,698 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:14:43,699 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 21:14:43,719 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-11-20 21:14:43,763 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-20 21:14:43,763 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 21:14:43,765 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 26 conjunts are in the unsatisfiable core [2022-11-20 21:14:43,767 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 21:14:44,600 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 45 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:14:44,601 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 21:14:45,432 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 55 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:14:45,432 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [37157762] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 21:14:45,433 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2140358105] [2022-11-20 21:14:45,434 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-20 21:14:45,434 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 21:14:45,435 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 21:14:45,435 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 21:14:45,435 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 21:14:45,579 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 21:14:46,778 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 [2022-11-20 21:14:46,779 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 21:14:46,779 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 21:14:46,779 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25, 25] total 59 [2022-11-20 21:14:46,779 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [722990830] [2022-11-20 21:14:46,779 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 21:14:46,779 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2022-11-20 21:14:46,780 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:14:46,780 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2022-11-20 21:14:46,780 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=703, Invalid=3853, Unknown=0, NotChecked=0, Total=4556 [2022-11-20 21:14:46,781 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) [2022-11-20 21:14:47,474 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:14:47,474 INFO L93 Difference]: Finished difference Result 35 states and 36 transitions. [2022-11-20 21:14:47,479 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-11-20 21:14:47,479 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 [2022-11-20 21:14:47,480 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:14:47,480 INFO L225 Difference]: With dead ends: 35 [2022-11-20 21:14:47,480 INFO L226 Difference]: Without dead ends: 31 [2022-11-20 21:14:47,481 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 33 SyntacticMatches, 12 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3152 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=1323, Invalid=4997, Unknown=0, NotChecked=0, Total=6320 [2022-11-20 21:14:47,482 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 [2022-11-20 21:14:47,482 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] [2022-11-20 21:14:47,483 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2022-11-20 21:14:47,497 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2022-11-20 21:14:47,497 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) [2022-11-20 21:14:47,497 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2022-11-20 21:14:47,497 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 29 [2022-11-20 21:14:47,498 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:14:47,498 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2022-11-20 21:14:47,498 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) [2022-11-20 21:14:47,498 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2022-11-20 21:14:47,498 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-11-20 21:14:47,499 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:14:47,499 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 21:14:47,504 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-11-20 21:14:47,702 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:14:47,703 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:14:47,703 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:14:47,703 INFO L85 PathProgramCache]: Analyzing trace with hash 236688594, now seen corresponding path program 19 times [2022-11-20 21:14:47,703 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:14:47,703 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [69129702] [2022-11-20 21:14:47,703 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:14:47,703 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:14:47,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:14:49,098 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:14:49,099 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:14:49,099 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [69129702] [2022-11-20 21:14:49,099 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [69129702] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 21:14:49,099 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1362553407] [2022-11-20 21:14:49,099 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-20 21:14:49,100 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:14:49,100 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:14:49,100 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 21:14:49,103 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-11-20 21:14:49,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:14:49,148 WARN L261 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 74 conjunts are in the unsatisfiable core [2022-11-20 21:14:49,149 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 21:14:52,981 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:14:52,981 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 21:14:55,489 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:14:55,489 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1362553407] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 21:14:55,489 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [318519146] [2022-11-20 21:14:55,491 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-20 21:14:55,491 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 21:14:55,491 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 21:14:55,491 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 21:14:55,492 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 21:14:55,660 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 21:14:57,628 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 [2022-11-20 21:14:57,628 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 21:14:57,628 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 21:14:57,628 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 81 [2022-11-20 21:14:57,628 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [378945169] [2022-11-20 21:14:57,628 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 21:14:57,629 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 81 states [2022-11-20 21:14:57,629 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:14:57,629 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 81 interpolants. [2022-11-20 21:14:57,630 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=331, Invalid=7679, Unknown=0, NotChecked=0, Total=8010 [2022-11-20 21:14:57,630 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) [2022-11-20 21:15:04,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:15:04,314 INFO L93 Difference]: Finished difference Result 52 states and 55 transitions. [2022-11-20 21:15:04,315 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-11-20 21:15:04,315 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 [2022-11-20 21:15:04,315 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:15:04,315 INFO L225 Difference]: With dead ends: 52 [2022-11-20 21:15:04,315 INFO L226 Difference]: Without dead ends: 32 [2022-11-20 21:15:04,316 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 28 SyntacticMatches, 1 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3032 ImplicationChecksByTransitivity, 13.3s TimeCoverageRelationStatistics Valid=641, Invalid=10915, Unknown=0, NotChecked=0, Total=11556 [2022-11-20 21:15:04,317 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, 1.2s IncrementalHoareTripleChecker+Time [2022-11-20 21:15:04,317 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [189 Valid, 92 Invalid, 1596 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [53 Valid, 1543 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2022-11-20 21:15:04,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2022-11-20 21:15:04,335 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2022-11-20 21:15:04,342 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) [2022-11-20 21:15:04,342 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 33 transitions. [2022-11-20 21:15:04,343 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 33 transitions. Word has length 30 [2022-11-20 21:15:04,343 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:15:04,343 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 33 transitions. [2022-11-20 21:15:04,343 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) [2022-11-20 21:15:04,343 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 33 transitions. [2022-11-20 21:15:04,343 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-11-20 21:15:04,344 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:15:04,344 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 21:15:04,348 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2022-11-20 21:15:04,544 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:15:04,544 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:15:04,545 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:15:04,545 INFO L85 PathProgramCache]: Analyzing trace with hash -1310924402, now seen corresponding path program 20 times [2022-11-20 21:15:04,545 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:15:04,545 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [34724016] [2022-11-20 21:15:04,545 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:15:04,545 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:15:04,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:15:05,478 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 45 proven. 76 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:15:05,479 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:15:05,479 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [34724016] [2022-11-20 21:15:05,479 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [34724016] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 21:15:05,479 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [247439956] [2022-11-20 21:15:05,479 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 21:15:05,479 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:15:05,480 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:15:05,481 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 21:15:05,501 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-11-20 21:15:05,544 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2022-11-20 21:15:05,544 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 21:15:05,546 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 28 conjunts are in the unsatisfiable core [2022-11-20 21:15:05,547 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 21:15:06,369 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 55 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:15:06,369 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 21:15:07,145 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 66 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:15:07,146 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [247439956] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 21:15:07,146 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1653822935] [2022-11-20 21:15:07,147 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-20 21:15:07,147 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 21:15:07,148 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 21:15:07,148 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 21:15:07,148 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 21:15:07,285 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 21:15:08,464 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 [2022-11-20 21:15:08,464 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 21:15:08,464 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 21:15:08,465 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27, 27] total 64 [2022-11-20 21:15:08,465 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1319475998] [2022-11-20 21:15:08,465 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 21:15:08,465 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 64 states [2022-11-20 21:15:08,466 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:15:08,466 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2022-11-20 21:15:08,466 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=818, Invalid=4438, Unknown=0, NotChecked=0, Total=5256 [2022-11-20 21:15:08,467 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) [2022-11-20 21:15:09,330 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:15:09,330 INFO L93 Difference]: Finished difference Result 37 states and 38 transitions. [2022-11-20 21:15:09,331 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-11-20 21:15:09,331 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 [2022-11-20 21:15:09,331 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:15:09,331 INFO L225 Difference]: With dead ends: 37 [2022-11-20 21:15:09,331 INFO L226 Difference]: Without dead ends: 33 [2022-11-20 21:15:09,332 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 35 SyntacticMatches, 13 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3686 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=1548, Invalid=5762, Unknown=0, NotChecked=0, Total=7310 [2022-11-20 21:15:09,332 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 115 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 218 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s 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 [2022-11-20 21:15:09,333 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] [2022-11-20 21:15:09,333 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2022-11-20 21:15:09,353 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2022-11-20 21:15:09,353 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) [2022-11-20 21:15:09,353 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2022-11-20 21:15:09,354 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 31 [2022-11-20 21:15:09,354 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:15:09,354 INFO L495 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2022-11-20 21:15:09,354 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) [2022-11-20 21:15:09,354 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2022-11-20 21:15:09,354 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-11-20 21:15:09,355 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:15:09,355 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 21:15:09,363 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2022-11-20 21:15:09,561 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2022-11-20 21:15:09,561 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:15:09,561 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:15:09,561 INFO L85 PathProgramCache]: Analyzing trace with hash -1993851979, now seen corresponding path program 21 times [2022-11-20 21:15:09,562 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:15:09,562 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1355616262] [2022-11-20 21:15:09,562 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:15:09,562 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:15:09,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:15:11,217 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:15:11,218 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:15:11,219 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1355616262] [2022-11-20 21:15:11,219 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1355616262] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 21:15:11,219 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [312399102] [2022-11-20 21:15:11,219 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-20 21:15:11,220 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:15:11,220 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:15:11,221 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 21:15:11,225 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-11-20 21:15:11,277 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-20 21:15:11,277 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 21:15:11,279 WARN L261 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 80 conjunts are in the unsatisfiable core [2022-11-20 21:15:11,281 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 21:15:15,433 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:15:15,433 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 21:15:18,802 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:15:18,802 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [312399102] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 21:15:18,802 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1030536574] [2022-11-20 21:15:18,805 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-20 21:15:18,806 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 21:15:18,806 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 21:15:18,806 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 21:15:18,806 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 21:15:18,940 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 21:15:21,004 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 [2022-11-20 21:15:21,005 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 21:15:21,005 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 21:15:21,005 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 88 [2022-11-20 21:15:21,005 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1091877732] [2022-11-20 21:15:21,005 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 21:15:21,006 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 88 states [2022-11-20 21:15:21,006 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:15:21,006 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 88 interpolants. [2022-11-20 21:15:21,007 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=358, Invalid=8954, Unknown=0, NotChecked=0, Total=9312 [2022-11-20 21:15:21,007 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) [2022-11-20 21:15:27,273 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:15:27,273 INFO L93 Difference]: Finished difference Result 55 states and 58 transitions. [2022-11-20 21:15:27,273 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-11-20 21:15:27,274 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 [2022-11-20 21:15:27,274 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:15:27,274 INFO L225 Difference]: With dead ends: 55 [2022-11-20 21:15:27,274 INFO L226 Difference]: Without dead ends: 34 [2022-11-20 21:15:27,275 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3450 ImplicationChecksByTransitivity, 13.9s TimeCoverageRelationStatistics Valid=610, Invalid=12272, Unknown=0, NotChecked=0, Total=12882 [2022-11-20 21:15:27,276 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 [2022-11-20 21:15:27,276 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] [2022-11-20 21:15:27,277 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2022-11-20 21:15:27,298 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2022-11-20 21:15:27,299 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) [2022-11-20 21:15:27,299 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 35 transitions. [2022-11-20 21:15:27,299 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 35 transitions. Word has length 32 [2022-11-20 21:15:27,299 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:15:27,300 INFO L495 AbstractCegarLoop]: Abstraction has 34 states and 35 transitions. [2022-11-20 21:15:27,300 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) [2022-11-20 21:15:27,300 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 35 transitions. [2022-11-20 21:15:27,300 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-11-20 21:15:27,301 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:15:27,301 INFO L195 NwaCegarLoop]: trace histogram [12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 21:15:27,307 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2022-11-20 21:15:27,507 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2022-11-20 21:15:27,507 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:15:27,507 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:15:27,507 INFO L85 PathProgramCache]: Analyzing trace with hash 1103710577, now seen corresponding path program 22 times [2022-11-20 21:15:27,507 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:15:27,508 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [307005608] [2022-11-20 21:15:27,508 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:15:27,508 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:15:27,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:15:28,530 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 55 proven. 89 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:15:28,531 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:15:28,531 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [307005608] [2022-11-20 21:15:28,531 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [307005608] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 21:15:28,531 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [779683375] [2022-11-20 21:15:28,531 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-20 21:15:28,532 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:15:28,532 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:15:28,533 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 21:15:28,536 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-11-20 21:15:28,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:15:28,587 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 30 conjunts are in the unsatisfiable core [2022-11-20 21:15:28,589 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 21:15:29,538 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 66 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:15:29,538 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 21:15:30,423 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 78 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:15:30,423 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [779683375] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 21:15:30,423 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [531136645] [2022-11-20 21:15:30,424 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-20 21:15:30,425 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 21:15:30,425 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 21:15:30,425 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 21:15:30,425 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 21:15:30,561 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 21:15:31,761 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 [2022-11-20 21:15:31,761 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 21:15:31,761 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 21:15:31,761 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29, 29] total 69 [2022-11-20 21:15:31,761 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [790431753] [2022-11-20 21:15:31,761 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 21:15:31,762 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 69 states [2022-11-20 21:15:31,762 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:15:31,763 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2022-11-20 21:15:31,763 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=942, Invalid=5064, Unknown=0, NotChecked=0, Total=6006 [2022-11-20 21:15:31,763 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) [2022-11-20 21:15:32,706 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:15:32,707 INFO L93 Difference]: Finished difference Result 39 states and 40 transitions. [2022-11-20 21:15:32,707 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-11-20 21:15:32,707 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 [2022-11-20 21:15:32,707 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:15:32,708 INFO L225 Difference]: With dead ends: 39 [2022-11-20 21:15:32,708 INFO L226 Difference]: Without dead ends: 35 [2022-11-20 21:15:32,709 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 37 SyntacticMatches, 14 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4261 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=1791, Invalid=6581, Unknown=0, NotChecked=0, Total=8372 [2022-11-20 21:15:32,709 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, 0.2s IncrementalHoareTripleChecker+Time [2022-11-20 21:15:32,710 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [160 Valid, 20 Invalid, 224 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 214 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-20 21:15:32,711 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2022-11-20 21:15:32,730 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2022-11-20 21:15:32,730 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) [2022-11-20 21:15:32,731 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2022-11-20 21:15:32,731 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 33 [2022-11-20 21:15:32,731 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:15:32,731 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 36 transitions. [2022-11-20 21:15:32,731 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) [2022-11-20 21:15:32,731 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 36 transitions. [2022-11-20 21:15:32,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-11-20 21:15:32,732 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:15:32,732 INFO L195 NwaCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 21:15:32,739 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2022-11-20 21:15:32,932 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:15:32,933 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:15:32,933 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:15:32,933 INFO L85 PathProgramCache]: Analyzing trace with hash -154611662, now seen corresponding path program 23 times [2022-11-20 21:15:32,933 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:15:32,933 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1987534135] [2022-11-20 21:15:32,933 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:15:32,933 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:15:32,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:15:34,709 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:15:34,709 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:15:34,709 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1987534135] [2022-11-20 21:15:34,709 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1987534135] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 21:15:34,709 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1408273589] [2022-11-20 21:15:34,709 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 21:15:34,710 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:15:34,710 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:15:34,711 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 21:15:34,714 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-11-20 21:15:34,766 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2022-11-20 21:15:34,766 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 21:15:34,768 WARN L261 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 86 conjunts are in the unsatisfiable core [2022-11-20 21:15:34,770 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 21:15:39,601 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:15:39,601 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 21:15:43,955 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:15:43,955 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1408273589] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 21:15:43,956 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [408539417] [2022-11-20 21:15:43,957 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-20 21:15:43,957 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 21:15:43,957 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 21:15:43,958 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 21:15:43,958 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 21:15:44,087 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 21:15:46,192 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 [2022-11-20 21:15:46,192 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 21:15:46,192 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 21:15:46,192 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 94 [2022-11-20 21:15:46,193 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [402804395] [2022-11-20 21:15:46,193 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 21:15:46,193 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 94 states [2022-11-20 21:15:46,193 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:15:46,194 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 94 interpolants. [2022-11-20 21:15:46,195 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=427, Invalid=10079, Unknown=0, NotChecked=0, Total=10506 [2022-11-20 21:15:46,195 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) [2022-11-20 21:16:09,488 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:16:09,488 INFO L93 Difference]: Finished difference Result 115 states and 133 transitions. [2022-11-20 21:16:09,488 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2022-11-20 21:16:09,488 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 [2022-11-20 21:16:09,489 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:16:09,490 INFO L225 Difference]: With dead ends: 115 [2022-11-20 21:16:09,490 INFO L226 Difference]: Without dead ends: 89 [2022-11-20 21:16:09,492 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 202 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 170 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8507 ImplicationChecksByTransitivity, 31.6s TimeCoverageRelationStatistics Valid=1722, Invalid=27690, Unknown=0, NotChecked=0, Total=29412 [2022-11-20 21:16:09,493 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, 2.1s IncrementalHoareTripleChecker+Time [2022-11-20 21:16:09,493 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [701 Valid, 93 Invalid, 2252 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [206 Valid, 2046 Invalid, 0 Unknown, 0 Unchecked, 2.1s Time] [2022-11-20 21:16:09,493 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2022-11-20 21:16:09,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 52. [2022-11-20 21:16:09,547 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) [2022-11-20 21:16:09,548 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 66 transitions. [2022-11-20 21:16:09,548 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 66 transitions. Word has length 34 [2022-11-20 21:16:09,548 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:16:09,548 INFO L495 AbstractCegarLoop]: Abstraction has 52 states and 66 transitions. [2022-11-20 21:16:09,548 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) [2022-11-20 21:16:09,548 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 66 transitions. [2022-11-20 21:16:09,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-11-20 21:16:09,549 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:16:09,549 INFO L195 NwaCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 21:16:09,553 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Ended with exit code 0 [2022-11-20 21:16:09,749 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2022-11-20 21:16:09,749 INFO L420 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:16:09,750 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:16:09,750 INFO L85 PathProgramCache]: Analyzing trace with hash 1605855829, now seen corresponding path program 24 times [2022-11-20 21:16:09,750 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:16:09,750 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2102113654] [2022-11-20 21:16:09,750 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:16:09,750 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:16:09,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:16:11,584 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:16:11,584 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:16:11,584 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2102113654] [2022-11-20 21:16:11,585 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2102113654] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 21:16:11,585 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1642188726] [2022-11-20 21:16:11,585 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-20 21:16:11,585 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:16:11,585 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:16:11,587 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 21:16:11,590 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2022-11-20 21:16:11,645 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-20 21:16:11,645 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 21:16:11,647 WARN L261 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 88 conjunts are in the unsatisfiable core [2022-11-20 21:16:11,651 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 21:16:16,954 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:16:16,954 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 21:16:20,836 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:16:20,837 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1642188726] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 21:16:20,837 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1695141058] [2022-11-20 21:16:20,838 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-20 21:16:20,838 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 21:16:20,838 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 21:16:20,839 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 21:16:20,839 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 21:16:20,955 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 21:16:23,189 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 [2022-11-20 21:16:23,189 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 21:16:23,189 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 21:16:23,190 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 100 [2022-11-20 21:16:23,190 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [677657977] [2022-11-20 21:16:23,190 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 21:16:23,190 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 100 states [2022-11-20 21:16:23,190 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:16:23,191 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 100 interpolants. [2022-11-20 21:16:23,191 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=406, Invalid=11366, Unknown=0, NotChecked=0, Total=11772 [2022-11-20 21:16:23,191 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) [2022-11-20 21:16:30,738 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:16:30,738 INFO L93 Difference]: Finished difference Result 75 states and 90 transitions. [2022-11-20 21:16:30,738 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-11-20 21:16:30,738 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 [2022-11-20 21:16:30,738 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:16:30,739 INFO L225 Difference]: With dead ends: 75 [2022-11-20 21:16:30,739 INFO L226 Difference]: Without dead ends: 52 [2022-11-20 21:16:30,739 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4396 ImplicationChecksByTransitivity, 16.5s TimeCoverageRelationStatistics Valid=690, Invalid=15566, Unknown=0, NotChecked=0, Total=16256 [2022-11-20 21:16:30,743 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 [2022-11-20 21:16:30,744 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] [2022-11-20 21:16:30,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2022-11-20 21:16:30,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2022-11-20 21:16:30,781 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) [2022-11-20 21:16:30,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 65 transitions. [2022-11-20 21:16:30,781 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 65 transitions. Word has length 36 [2022-11-20 21:16:30,781 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:16:30,782 INFO L495 AbstractCegarLoop]: Abstraction has 52 states and 65 transitions. [2022-11-20 21:16:30,782 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) [2022-11-20 21:16:30,782 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 65 transitions. [2022-11-20 21:16:30,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-11-20 21:16:30,783 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:16:30,783 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 21:16:30,787 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2022-11-20 21:16:30,984 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:16:30,984 INFO L420 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:16:30,984 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:16:30,984 INFO L85 PathProgramCache]: Analyzing trace with hash -1587332591, now seen corresponding path program 25 times [2022-11-20 21:16:30,984 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:16:30,984 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [607077384] [2022-11-20 21:16:30,984 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:16:30,984 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:16:30,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:16:32,150 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 78 proven. 118 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:16:32,150 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:16:32,150 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [607077384] [2022-11-20 21:16:32,150 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [607077384] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 21:16:32,150 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [373439425] [2022-11-20 21:16:32,150 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-20 21:16:32,151 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:16:32,151 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:16:32,152 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 21:16:32,154 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2022-11-20 21:16:32,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:16:32,208 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 34 conjunts are in the unsatisfiable core [2022-11-20 21:16:32,210 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 21:16:33,393 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 91 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:16:33,393 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 21:16:34,499 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 105 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:16:34,499 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [373439425] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 21:16:34,499 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [26974139] [2022-11-20 21:16:34,500 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-20 21:16:34,500 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 21:16:34,501 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 21:16:34,501 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 21:16:34,501 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 21:16:34,637 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 21:16:35,945 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 [2022-11-20 21:16:35,946 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 21:16:35,946 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 21:16:35,946 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 33, 33] total 79 [2022-11-20 21:16:35,946 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1549395146] [2022-11-20 21:16:35,946 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 21:16:35,946 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 79 states [2022-11-20 21:16:35,947 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:16:35,951 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2022-11-20 21:16:35,951 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1217, Invalid=6439, Unknown=0, NotChecked=0, Total=7656 [2022-11-20 21:16:35,952 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) [2022-11-20 21:16:37,073 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:16:37,073 INFO L93 Difference]: Finished difference Result 70 states and 84 transitions. [2022-11-20 21:16:37,073 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-11-20 21:16:37,074 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 [2022-11-20 21:16:37,074 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:16:37,074 INFO L225 Difference]: With dead ends: 70 [2022-11-20 21:16:37,075 INFO L226 Difference]: Without dead ends: 66 [2022-11-20 21:16:37,076 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 [2022-11-20 21:16:37,076 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 [2022-11-20 21:16:37,077 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] [2022-11-20 21:16:37,077 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2022-11-20 21:16:37,117 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 39. [2022-11-20 21:16:37,117 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) [2022-11-20 21:16:37,118 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2022-11-20 21:16:37,118 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 37 [2022-11-20 21:16:37,118 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:16:37,118 INFO L495 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2022-11-20 21:16:37,118 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) [2022-11-20 21:16:37,119 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2022-11-20 21:16:37,119 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-11-20 21:16:37,119 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:16:37,119 INFO L195 NwaCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 21:16:37,131 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2022-11-20 21:16:37,325 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:16:37,325 INFO L420 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:16:37,325 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:16:37,326 INFO L85 PathProgramCache]: Analyzing trace with hash -1972571246, now seen corresponding path program 26 times [2022-11-20 21:16:37,326 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:16:37,326 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1451216929] [2022-11-20 21:16:37,326 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:16:37,326 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:16:37,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:16:39,252 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:16:39,252 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:16:39,252 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1451216929] [2022-11-20 21:16:39,252 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1451216929] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 21:16:39,252 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [973555498] [2022-11-20 21:16:39,253 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 21:16:39,253 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:16:39,253 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:16:39,255 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 21:16:39,257 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2022-11-20 21:16:39,317 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2022-11-20 21:16:39,318 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 21:16:39,320 WARN L261 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 92 conjunts are in the unsatisfiable core [2022-11-20 21:16:39,322 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 21:16:45,426 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:16:45,426 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 21:16:49,785 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:16:49,785 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [973555498] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 21:16:49,786 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1381400152] [2022-11-20 21:16:49,787 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-20 21:16:49,787 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 21:16:49,787 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 21:16:49,788 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 21:16:49,788 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 21:16:49,912 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 21:16:52,199 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 [2022-11-20 21:16:52,199 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 21:16:52,200 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 21:16:52,200 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 106 [2022-11-20 21:16:52,200 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1291705822] [2022-11-20 21:16:52,200 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 21:16:52,200 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 106 states [2022-11-20 21:16:52,201 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:16:52,201 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 106 interpolants. [2022-11-20 21:16:52,202 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=430, Invalid=12680, Unknown=0, NotChecked=0, Total=13110 [2022-11-20 21:16:52,202 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) [2022-11-20 21:17:01,382 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:17:01,382 INFO L93 Difference]: Finished difference Result 64 states and 67 transitions. [2022-11-20 21:17:01,382 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2022-11-20 21:17:01,383 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 [2022-11-20 21:17:01,383 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:17:01,383 INFO L225 Difference]: With dead ends: 64 [2022-11-20 21:17:01,383 INFO L226 Difference]: Without dead ends: 40 [2022-11-20 21:17:01,384 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 133 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4911 ImplicationChecksByTransitivity, 18.8s TimeCoverageRelationStatistics Valid=730, Invalid=17360, Unknown=0, NotChecked=0, Total=18090 [2022-11-20 21:17:01,385 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 186 mSDsluCounter, 132 mSDsCounter, 0 mSdLazyCounter, 2743 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s 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, 2.4s IncrementalHoareTripleChecker+Time [2022-11-20 21:17:01,387 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [186 Valid, 134 Invalid, 2751 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 2743 Invalid, 0 Unknown, 0 Unchecked, 2.4s Time] [2022-11-20 21:17:01,389 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2022-11-20 21:17:01,451 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2022-11-20 21:17:01,451 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) [2022-11-20 21:17:01,452 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 41 transitions. [2022-11-20 21:17:01,452 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 41 transitions. Word has length 38 [2022-11-20 21:17:01,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:17:01,452 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 41 transitions. [2022-11-20 21:17:01,453 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) [2022-11-20 21:17:01,453 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 41 transitions. [2022-11-20 21:17:01,453 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-11-20 21:17:01,453 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:17:01,453 INFO L195 NwaCegarLoop]: trace histogram [15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 21:17:01,458 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2022-11-20 21:17:01,653 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable31 [2022-11-20 21:17:01,654 INFO L420 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:17:01,654 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:17:01,654 INFO L85 PathProgramCache]: Analyzing trace with hash 274973774, now seen corresponding path program 27 times [2022-11-20 21:17:01,654 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:17:01,654 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [949888477] [2022-11-20 21:17:01,654 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:17:01,655 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:17:01,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:17:03,075 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 91 proven. 134 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:17:03,076 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:17:03,076 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [949888477] [2022-11-20 21:17:03,076 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [949888477] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 21:17:03,076 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1662127069] [2022-11-20 21:17:03,076 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-20 21:17:03,076 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:17:03,076 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:17:03,077 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 21:17:03,083 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2022-11-20 21:17:03,137 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-20 21:17:03,137 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 21:17:03,139 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 36 conjunts are in the unsatisfiable core [2022-11-20 21:17:03,140 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 21:17:04,507 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 105 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:17:04,507 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 21:17:05,902 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 120 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:17:05,902 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1662127069] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 21:17:05,902 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1449108081] [2022-11-20 21:17:05,904 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-20 21:17:05,904 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 21:17:05,904 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 21:17:05,904 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 21:17:05,904 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 21:17:06,062 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 21:17:07,439 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 [2022-11-20 21:17:07,439 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 21:17:07,439 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 21:17:07,439 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 35, 35] total 84 [2022-11-20 21:17:07,439 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1844833479] [2022-11-20 21:17:07,440 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 21:17:07,440 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 84 states [2022-11-20 21:17:07,440 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:17:07,441 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2022-11-20 21:17:07,441 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1368, Invalid=7188, Unknown=0, NotChecked=0, Total=8556 [2022-11-20 21:17:07,442 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) [2022-11-20 21:17:08,642 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:17:08,642 INFO L93 Difference]: Finished difference Result 45 states and 46 transitions. [2022-11-20 21:17:08,642 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-11-20 21:17:08,643 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 [2022-11-20 21:17:08,643 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:17:08,643 INFO L225 Difference]: With dead ends: 45 [2022-11-20 21:17:08,643 INFO L226 Difference]: Without dead ends: 41 [2022-11-20 21:17:08,644 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 43 SyntacticMatches, 17 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6232 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=2628, Invalid=9362, Unknown=0, NotChecked=0, Total=11990 [2022-11-20 21:17:08,647 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 184 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 236 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s 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 [2022-11-20 21:17:08,647 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] [2022-11-20 21:17:08,648 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2022-11-20 21:17:08,684 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2022-11-20 21:17:08,685 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) [2022-11-20 21:17:08,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 42 transitions. [2022-11-20 21:17:08,685 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 42 transitions. Word has length 39 [2022-11-20 21:17:08,686 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:17:08,686 INFO L495 AbstractCegarLoop]: Abstraction has 41 states and 42 transitions. [2022-11-20 21:17:08,686 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) [2022-11-20 21:17:08,686 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 42 transitions. [2022-11-20 21:17:08,687 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-11-20 21:17:08,687 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:17:08,687 INFO L195 NwaCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 21:17:08,693 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2022-11-20 21:17:08,893 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2022-11-20 21:17:08,893 INFO L420 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:17:08,894 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:17:08,894 INFO L85 PathProgramCache]: Analyzing trace with hash -75648779, now seen corresponding path program 28 times [2022-11-20 21:17:08,894 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:17:08,894 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [640961803] [2022-11-20 21:17:08,894 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:17:08,895 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:17:08,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:17:11,149 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:17:11,149 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:17:11,150 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [640961803] [2022-11-20 21:17:11,150 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [640961803] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 21:17:11,150 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [92199677] [2022-11-20 21:17:11,150 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-20 21:17:11,150 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:17:11,150 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:17:11,152 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 21:17:11,155 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2022-11-20 21:17:11,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:17:11,213 WARN L261 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 94 conjunts are in the unsatisfiable core [2022-11-20 21:17:11,215 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 21:17:17,408 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:17:17,409 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 21:17:22,079 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:17:22,080 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [92199677] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 21:17:22,080 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1145550176] [2022-11-20 21:17:22,082 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-20 21:17:22,082 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 21:17:22,082 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 21:17:22,083 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 21:17:22,083 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 21:17:22,213 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 21:17:24,757 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 [2022-11-20 21:17:24,757 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 21:17:24,758 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 21:17:24,758 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 111 [2022-11-20 21:17:24,758 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1941917493] [2022-11-20 21:17:24,758 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 21:17:24,759 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 111 states [2022-11-20 21:17:24,759 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:17:24,759 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 111 interpolants. [2022-11-20 21:17:24,760 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=451, Invalid=13829, Unknown=0, NotChecked=0, Total=14280 [2022-11-20 21:17:24,760 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) [2022-11-20 21:17:36,495 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:17:36,495 INFO L93 Difference]: Finished difference Result 67 states and 70 transitions. [2022-11-20 21:17:36,495 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2022-11-20 21:17:36,495 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 [2022-11-20 21:17:36,495 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:17:36,496 INFO L225 Difference]: With dead ends: 67 [2022-11-20 21:17:36,496 INFO L226 Difference]: Without dead ends: 42 [2022-11-20 21:17:36,497 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 180 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 141 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5443 ImplicationChecksByTransitivity, 22.3s TimeCoverageRelationStatistics Valid=861, Invalid=19445, Unknown=0, NotChecked=0, Total=20306 [2022-11-20 21:17:36,497 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 249 mSDsluCounter, 141 mSDsCounter, 0 mSdLazyCounter, 2946 mSolverCounterSat, 73 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s 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, 2.4s IncrementalHoareTripleChecker+Time [2022-11-20 21:17:36,498 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [249 Valid, 143 Invalid, 3019 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [73 Valid, 2946 Invalid, 0 Unknown, 0 Unchecked, 2.4s Time] [2022-11-20 21:17:36,498 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2022-11-20 21:17:36,553 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2022-11-20 21:17:36,553 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) [2022-11-20 21:17:36,553 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2022-11-20 21:17:36,554 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 40 [2022-11-20 21:17:36,554 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:17:36,554 INFO L495 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2022-11-20 21:17:36,554 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) [2022-11-20 21:17:36,554 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2022-11-20 21:17:36,555 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-11-20 21:17:36,555 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:17:36,555 INFO L195 NwaCegarLoop]: trace histogram [16, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 21:17:36,561 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2022-11-20 21:17:36,761 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2022-11-20 21:17:36,761 INFO L420 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:17:36,761 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:17:36,761 INFO L85 PathProgramCache]: Analyzing trace with hash -553434447, now seen corresponding path program 29 times [2022-11-20 21:17:36,762 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:17:36,762 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2021226840] [2022-11-20 21:17:36,762 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:17:36,762 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:17:36,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:17:38,262 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 105 proven. 151 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:17:38,262 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:17:38,262 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2021226840] [2022-11-20 21:17:38,262 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2021226840] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 21:17:38,262 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1149370994] [2022-11-20 21:17:38,262 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 21:17:38,262 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:17:38,262 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:17:38,263 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 21:17:38,266 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2022-11-20 21:17:38,326 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2022-11-20 21:17:38,326 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 21:17:38,328 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 38 conjunts are in the unsatisfiable core [2022-11-20 21:17:38,329 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 21:17:39,795 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 120 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:17:39,795 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 21:17:41,250 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 136 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:17:41,250 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1149370994] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 21:17:41,250 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1711339294] [2022-11-20 21:17:41,251 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-20 21:17:41,252 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 21:17:41,252 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 21:17:41,252 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 21:17:41,252 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 21:17:41,375 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 21:17:42,837 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 [2022-11-20 21:17:42,837 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 21:17:42,838 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 21:17:42,838 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 37, 37] total 89 [2022-11-20 21:17:42,838 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1057783869] [2022-11-20 21:17:42,838 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 21:17:42,838 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 89 states [2022-11-20 21:17:42,838 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:17:42,839 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2022-11-20 21:17:42,840 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1528, Invalid=7978, Unknown=0, NotChecked=0, Total=9506 [2022-11-20 21:17:42,840 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) [2022-11-20 21:17:44,163 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:17:44,163 INFO L93 Difference]: Finished difference Result 47 states and 48 transitions. [2022-11-20 21:17:44,164 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-11-20 21:17:44,164 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 [2022-11-20 21:17:44,164 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:17:44,164 INFO L225 Difference]: With dead ends: 47 [2022-11-20 21:17:44,165 INFO L226 Difference]: Without dead ends: 43 [2022-11-20 21:17:44,166 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 177 GetRequests, 45 SyntacticMatches, 18 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6971 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=2943, Invalid=10397, Unknown=0, NotChecked=0, Total=13340 [2022-11-20 21:17:44,166 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 [2022-11-20 21:17:44,166 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] [2022-11-20 21:17:44,167 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2022-11-20 21:17:44,215 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2022-11-20 21:17:44,215 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) [2022-11-20 21:17:44,216 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 44 transitions. [2022-11-20 21:17:44,216 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 44 transitions. Word has length 41 [2022-11-20 21:17:44,216 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:17:44,216 INFO L495 AbstractCegarLoop]: Abstraction has 43 states and 44 transitions. [2022-11-20 21:17:44,216 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) [2022-11-20 21:17:44,216 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 44 transitions. [2022-11-20 21:17:44,217 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2022-11-20 21:17:44,217 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:17:44,217 INFO L195 NwaCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 21:17:44,223 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2022-11-20 21:17:44,417 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34,32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:17:44,417 INFO L420 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:17:44,418 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:17:44,418 INFO L85 PathProgramCache]: Analyzing trace with hash 13500146, now seen corresponding path program 30 times [2022-11-20 21:17:44,418 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:17:44,418 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1818008368] [2022-11-20 21:17:44,418 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:17:44,418 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:17:44,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:17:46,913 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:17:46,913 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:17:46,914 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1818008368] [2022-11-20 21:17:46,914 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1818008368] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 21:17:46,914 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2123026730] [2022-11-20 21:17:46,914 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-20 21:17:46,914 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:17:46,914 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:17:46,915 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 21:17:46,917 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2022-11-20 21:17:46,969 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-20 21:17:46,969 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 21:17:46,972 WARN L261 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 100 conjunts are in the unsatisfiable core [2022-11-20 21:17:46,974 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 21:17:55,469 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:17:55,470 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 21:18:02,108 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:18:02,109 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2123026730] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 21:18:02,109 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1905848105] [2022-11-20 21:18:02,110 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-20 21:18:02,110 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 21:18:02,111 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 21:18:02,111 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 21:18:02,111 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 21:18:02,258 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 21:18:05,338 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 [2022-11-20 21:18:05,338 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 21:18:05,339 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 21:18:05,340 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41] total 118 [2022-11-20 21:18:05,340 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1124011295] [2022-11-20 21:18:05,340 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 21:18:05,340 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 118 states [2022-11-20 21:18:05,341 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:18:05,341 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 118 interpolants. [2022-11-20 21:18:05,342 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=478, Invalid=15524, Unknown=0, NotChecked=0, Total=16002 [2022-11-20 21:18:05,342 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) [2022-11-20 21:18:17,178 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:18:17,179 INFO L93 Difference]: Finished difference Result 70 states and 73 transitions. [2022-11-20 21:18:17,179 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2022-11-20 21:18:17,179 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 [2022-11-20 21:18:17,180 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:18:17,180 INFO L225 Difference]: With dead ends: 70 [2022-11-20 21:18:17,180 INFO L226 Difference]: Without dead ends: 44 [2022-11-20 21:18:17,182 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 187 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 147 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6025 ImplicationChecksByTransitivity, 26.2s TimeCoverageRelationStatistics Valid=810, Invalid=21242, Unknown=0, NotChecked=0, Total=22052 [2022-11-20 21:18:17,183 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 213 mSDsluCounter, 146 mSDsCounter, 0 mSdLazyCounter, 3145 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.6s 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, 2.9s IncrementalHoareTripleChecker+Time [2022-11-20 21:18:17,183 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [213 Valid, 148 Invalid, 3153 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 3145 Invalid, 0 Unknown, 0 Unchecked, 2.9s Time] [2022-11-20 21:18:17,184 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-11-20 21:18:17,236 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2022-11-20 21:18:17,236 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) [2022-11-20 21:18:17,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 45 transitions. [2022-11-20 21:18:17,237 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 45 transitions. Word has length 42 [2022-11-20 21:18:17,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:18:17,237 INFO L495 AbstractCegarLoop]: Abstraction has 44 states and 45 transitions. [2022-11-20 21:18:17,238 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) [2022-11-20 21:18:17,238 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 45 transitions. [2022-11-20 21:18:17,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-11-20 21:18:17,239 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:18:17,239 INFO L195 NwaCegarLoop]: trace histogram [17, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 21:18:17,244 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2022-11-20 21:18:17,439 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:18:17,439 INFO L420 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:18:17,440 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:18:17,440 INFO L85 PathProgramCache]: Analyzing trace with hash 422973870, now seen corresponding path program 31 times [2022-11-20 21:18:17,440 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:18:17,440 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1664087781] [2022-11-20 21:18:17,440 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:18:17,440 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:18:17,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:18:19,321 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 120 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:18:19,321 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:18:19,322 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1664087781] [2022-11-20 21:18:19,322 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1664087781] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 21:18:19,322 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2043167025] [2022-11-20 21:18:19,322 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-20 21:18:19,322 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:18:19,322 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:18:19,323 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 21:18:19,326 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2022-11-20 21:18:19,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:18:19,397 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 40 conjunts are in the unsatisfiable core [2022-11-20 21:18:19,399 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 21:18:21,269 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 136 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:18:21,269 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 21:18:23,175 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 153 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:18:23,175 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2043167025] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 21:18:23,176 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1018266191] [2022-11-20 21:18:23,177 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-20 21:18:23,177 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 21:18:23,177 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 21:18:23,178 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 21:18:23,178 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 21:18:23,321 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 21:18:24,998 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 [2022-11-20 21:18:24,999 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 21:18:24,999 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 21:18:24,999 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 39, 39] total 94 [2022-11-20 21:18:24,999 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2047300820] [2022-11-20 21:18:24,999 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 21:18:25,000 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 94 states [2022-11-20 21:18:25,000 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:18:25,001 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 94 interpolants. [2022-11-20 21:18:25,001 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1697, Invalid=8809, Unknown=0, NotChecked=0, Total=10506 [2022-11-20 21:18:25,002 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) [2022-11-20 21:18:26,614 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:18:26,614 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2022-11-20 21:18:26,614 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2022-11-20 21:18:26,615 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 [2022-11-20 21:18:26,615 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:18:26,615 INFO L225 Difference]: With dead ends: 49 [2022-11-20 21:18:26,615 INFO L226 Difference]: Without dead ends: 45 [2022-11-20 21:18:26,616 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 186 GetRequests, 47 SyntacticMatches, 19 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7751 ImplicationChecksByTransitivity, 7.5s TimeCoverageRelationStatistics Valid=3276, Invalid=11486, Unknown=0, NotChecked=0, Total=14762 [2022-11-20 21:18:26,617 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 [2022-11-20 21:18:26,617 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] [2022-11-20 21:18:26,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2022-11-20 21:18:26,659 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2022-11-20 21:18:26,659 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) [2022-11-20 21:18:26,660 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2022-11-20 21:18:26,660 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 43 [2022-11-20 21:18:26,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:18:26,660 INFO L495 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2022-11-20 21:18:26,660 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) [2022-11-20 21:18:26,661 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2022-11-20 21:18:26,661 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-11-20 21:18:26,661 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:18:26,661 INFO L195 NwaCegarLoop]: trace histogram [17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 21:18:26,667 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Ended with exit code 0 [2022-11-20 21:18:26,861 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2022-11-20 21:18:26,862 INFO L420 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:18:26,862 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:18:26,862 INFO L85 PathProgramCache]: Analyzing trace with hash 217386901, now seen corresponding path program 32 times [2022-11-20 21:18:26,862 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:18:26,862 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1718724867] [2022-11-20 21:18:26,862 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:18:26,863 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:18:26,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:18:29,904 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:18:29,905 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:18:29,905 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1718724867] [2022-11-20 21:18:29,905 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1718724867] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 21:18:29,905 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [221897306] [2022-11-20 21:18:29,905 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 21:18:29,905 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:18:29,906 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:18:29,907 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 21:18:29,910 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2022-11-20 21:18:29,986 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2022-11-20 21:18:29,987 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 21:18:29,990 WARN L261 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 104 conjunts are in the unsatisfiable core [2022-11-20 21:18:29,992 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 21:18:39,845 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:18:39,845 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 21:18:47,270 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:18:47,270 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [221897306] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 21:18:47,270 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [831106864] [2022-11-20 21:18:47,271 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-20 21:18:47,272 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 21:18:47,272 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 21:18:47,272 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 21:18:47,273 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 21:18:47,414 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 21:18:50,662 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 [2022-11-20 21:18:50,663 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 21:18:50,663 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 21:18:50,663 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43] total 124 [2022-11-20 21:18:50,663 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [499995864] [2022-11-20 21:18:50,663 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 21:18:50,664 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 124 states [2022-11-20 21:18:50,664 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:18:50,665 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 124 interpolants. [2022-11-20 21:18:50,666 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=502, Invalid=17054, Unknown=0, NotChecked=0, Total=17556 [2022-11-20 21:18:50,666 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) [2022-11-20 21:19:01,754 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:19:01,754 INFO L93 Difference]: Finished difference Result 73 states and 76 transitions. [2022-11-20 21:19:01,755 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2022-11-20 21:19:01,755 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 [2022-11-20 21:19:01,755 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:19:01,756 INFO L225 Difference]: With dead ends: 73 [2022-11-20 21:19:01,756 INFO L226 Difference]: Without dead ends: 46 [2022-11-20 21:19:01,757 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 154 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6624 ImplicationChecksByTransitivity, 28.0s TimeCoverageRelationStatistics Valid=850, Invalid=23330, Unknown=0, NotChecked=0, Total=24180 [2022-11-20 21:19:01,757 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 202 mSDsluCounter, 145 mSDsCounter, 0 mSdLazyCounter, 3274 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.6s 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, 2.9s IncrementalHoareTripleChecker+Time [2022-11-20 21:19:01,757 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [202 Valid, 147 Invalid, 3282 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 3274 Invalid, 0 Unknown, 0 Unchecked, 2.9s Time] [2022-11-20 21:19:01,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2022-11-20 21:19:01,796 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2022-11-20 21:19:01,796 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) [2022-11-20 21:19:01,796 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 47 transitions. [2022-11-20 21:19:01,796 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 47 transitions. Word has length 44 [2022-11-20 21:19:01,797 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:19:01,797 INFO L495 AbstractCegarLoop]: Abstraction has 46 states and 47 transitions. [2022-11-20 21:19:01,797 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) [2022-11-20 21:19:01,797 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 47 transitions. [2022-11-20 21:19:01,797 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2022-11-20 21:19:01,798 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:19:01,798 INFO L195 NwaCegarLoop]: trace histogram [18, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 21:19:01,808 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Ended with exit code 0 [2022-11-20 21:19:02,003 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2022-11-20 21:19:02,003 INFO L420 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:19:02,003 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:19:02,003 INFO L85 PathProgramCache]: Analyzing trace with hash -1415355567, now seen corresponding path program 33 times [2022-11-20 21:19:02,004 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:19:02,004 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [954225794] [2022-11-20 21:19:02,004 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:19:02,004 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:19:02,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:19:03,754 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 136 proven. 188 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:19:03,754 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:19:03,755 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [954225794] [2022-11-20 21:19:03,755 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [954225794] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 21:19:03,755 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [167741179] [2022-11-20 21:19:03,755 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-20 21:19:03,755 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:19:03,755 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:19:03,756 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 21:19:03,758 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2022-11-20 21:19:03,810 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-20 21:19:03,810 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 21:19:03,812 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 42 conjunts are in the unsatisfiable core [2022-11-20 21:19:03,814 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 21:19:05,545 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 153 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:19:05,546 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 21:19:07,257 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 171 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:19:07,257 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [167741179] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 21:19:07,257 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2115642189] [2022-11-20 21:19:07,258 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-20 21:19:07,258 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 21:19:07,258 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 21:19:07,259 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 21:19:07,259 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 21:19:07,386 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 21:19:08,854 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 [2022-11-20 21:19:08,854 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 21:19:08,854 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 21:19:08,855 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 41, 41] total 99 [2022-11-20 21:19:08,855 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [426549796] [2022-11-20 21:19:08,855 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 21:19:08,855 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 99 states [2022-11-20 21:19:08,855 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:19:08,856 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 99 interpolants. [2022-11-20 21:19:08,856 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1875, Invalid=9681, Unknown=0, NotChecked=0, Total=11556 [2022-11-20 21:19:08,856 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) [2022-11-20 21:19:10,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:19:10,336 INFO L93 Difference]: Finished difference Result 51 states and 52 transitions. [2022-11-20 21:19:10,336 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2022-11-20 21:19:10,337 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 [2022-11-20 21:19:10,337 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:19:10,337 INFO L225 Difference]: With dead ends: 51 [2022-11-20 21:19:10,337 INFO L226 Difference]: Without dead ends: 47 [2022-11-20 21:19:10,339 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 49 SyntacticMatches, 20 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8572 ImplicationChecksByTransitivity, 6.8s TimeCoverageRelationStatistics Valid=3627, Invalid=12629, Unknown=0, NotChecked=0, Total=16256 [2022-11-20 21:19:10,340 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 [2022-11-20 21:19:10,340 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] [2022-11-20 21:19:10,341 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2022-11-20 21:19:10,389 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2022-11-20 21:19:10,389 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) [2022-11-20 21:19:10,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 48 transitions. [2022-11-20 21:19:10,389 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 48 transitions. Word has length 45 [2022-11-20 21:19:10,389 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:19:10,389 INFO L495 AbstractCegarLoop]: Abstraction has 47 states and 48 transitions. [2022-11-20 21:19:10,390 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) [2022-11-20 21:19:10,390 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 48 transitions. [2022-11-20 21:19:10,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-11-20 21:19:10,390 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:19:10,390 INFO L195 NwaCegarLoop]: trace histogram [18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 21:19:10,395 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2022-11-20 21:19:10,590 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38,36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:19:10,591 INFO L420 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:19:10,591 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:19:10,591 INFO L85 PathProgramCache]: Analyzing trace with hash -936250798, now seen corresponding path program 34 times [2022-11-20 21:19:10,591 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:19:10,591 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1149250082] [2022-11-20 21:19:10,591 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:19:10,591 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:19:10,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:19:13,359 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:19:13,360 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:19:13,360 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1149250082] [2022-11-20 21:19:13,360 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1149250082] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 21:19:13,360 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [687611464] [2022-11-20 21:19:13,360 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-20 21:19:13,360 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:19:13,361 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:19:13,362 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 21:19:13,365 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2022-11-20 21:19:13,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:19:13,422 WARN L261 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 106 conjunts are in the unsatisfiable core [2022-11-20 21:19:13,425 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 21:19:22,181 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:19:22,181 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 21:19:28,357 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:19:28,358 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [687611464] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 21:19:28,358 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1262027974] [2022-11-20 21:19:28,359 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-20 21:19:28,359 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 21:19:28,359 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 21:19:28,359 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 21:19:28,359 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 21:19:28,471 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 21:19:31,238 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 [2022-11-20 21:19:31,238 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 21:19:31,238 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 21:19:31,238 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 45] total 129 [2022-11-20 21:19:31,238 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1343321414] [2022-11-20 21:19:31,238 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 21:19:31,239 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 129 states [2022-11-20 21:19:31,239 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:19:31,239 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 129 interpolants. [2022-11-20 21:19:31,240 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=523, Invalid=18383, Unknown=0, NotChecked=0, Total=18906 [2022-11-20 21:19:31,240 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) [2022-11-20 21:19:45,292 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:19:45,292 INFO L93 Difference]: Finished difference Result 76 states and 79 transitions. [2022-11-20 21:19:45,293 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2022-11-20 21:19:45,293 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 [2022-11-20 21:19:45,293 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:19:45,294 INFO L225 Difference]: With dead ends: 76 [2022-11-20 21:19:45,294 INFO L226 Difference]: Without dead ends: 48 [2022-11-20 21:19:45,295 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 207 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 162 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7240 ImplicationChecksByTransitivity, 27.8s TimeCoverageRelationStatistics Valid=993, Invalid=25739, Unknown=0, NotChecked=0, Total=26732 [2022-11-20 21:19:45,295 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 239 mSDsluCounter, 180 mSDsCounter, 0 mSdLazyCounter, 4199 mSolverCounterSat, 85 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.1s 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, 3.6s IncrementalHoareTripleChecker+Time [2022-11-20 21:19:45,295 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [239 Valid, 182 Invalid, 4284 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [85 Valid, 4199 Invalid, 0 Unknown, 0 Unchecked, 3.6s Time] [2022-11-20 21:19:45,296 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2022-11-20 21:19:45,337 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2022-11-20 21:19:45,338 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) [2022-11-20 21:19:45,338 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 49 transitions. [2022-11-20 21:19:45,338 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 49 transitions. Word has length 46 [2022-11-20 21:19:45,338 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:19:45,338 INFO L495 AbstractCegarLoop]: Abstraction has 48 states and 49 transitions. [2022-11-20 21:19:45,339 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) [2022-11-20 21:19:45,339 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 49 transitions. [2022-11-20 21:19:45,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-11-20 21:19:45,339 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:19:45,339 INFO L195 NwaCegarLoop]: trace histogram [19, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 21:19:45,347 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Forceful destruction successful, exit code 0 [2022-11-20 21:19:45,540 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2022-11-20 21:19:45,540 INFO L420 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:19:45,540 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:19:45,540 INFO L85 PathProgramCache]: Analyzing trace with hash 1956267790, now seen corresponding path program 35 times [2022-11-20 21:19:45,540 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:19:45,541 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2082392279] [2022-11-20 21:19:45,541 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:19:45,541 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:19:45,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:19:47,423 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 153 proven. 208 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:19:47,423 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:19:47,424 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2082392279] [2022-11-20 21:19:47,424 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2082392279] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 21:19:47,424 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1624297024] [2022-11-20 21:19:47,424 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 21:19:47,427 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:19:47,427 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:19:47,428 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 21:19:47,434 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2022-11-20 21:19:47,497 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2022-11-20 21:19:47,497 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 21:19:47,499 INFO L263 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 44 conjunts are in the unsatisfiable core [2022-11-20 21:19:47,500 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 21:19:49,411 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 171 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:19:49,412 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 21:19:51,355 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 190 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:19:51,355 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1624297024] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 21:19:51,355 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1295624781] [2022-11-20 21:19:51,356 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-20 21:19:51,356 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 21:19:51,356 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 21:19:51,357 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 21:19:51,357 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 21:19:51,468 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 21:19:52,993 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 [2022-11-20 21:19:52,993 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 21:19:52,993 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 21:19:52,993 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 43, 43] total 104 [2022-11-20 21:19:52,994 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1394296391] [2022-11-20 21:19:52,994 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 21:19:52,994 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 104 states [2022-11-20 21:19:52,994 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:19:52,995 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 104 interpolants. [2022-11-20 21:19:52,996 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2062, Invalid=10594, Unknown=0, NotChecked=0, Total=12656 [2022-11-20 21:19:52,996 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) [2022-11-20 21:19:54,656 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:19:54,656 INFO L93 Difference]: Finished difference Result 53 states and 54 transitions. [2022-11-20 21:19:54,656 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2022-11-20 21:19:54,656 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 [2022-11-20 21:19:54,657 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:19:54,657 INFO L225 Difference]: With dead ends: 53 [2022-11-20 21:19:54,657 INFO L226 Difference]: Without dead ends: 49 [2022-11-20 21:19:54,658 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 204 GetRequests, 51 SyntacticMatches, 21 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9434 ImplicationChecksByTransitivity, 7.4s TimeCoverageRelationStatistics Valid=3996, Invalid=13826, Unknown=0, NotChecked=0, Total=17822 [2022-11-20 21:19:54,659 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 [2022-11-20 21:19:54,659 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] [2022-11-20 21:19:54,660 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2022-11-20 21:19:54,703 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2022-11-20 21:19:54,703 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) [2022-11-20 21:19:54,704 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 50 transitions. [2022-11-20 21:19:54,704 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 50 transitions. Word has length 47 [2022-11-20 21:19:54,704 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:19:54,704 INFO L495 AbstractCegarLoop]: Abstraction has 49 states and 50 transitions. [2022-11-20 21:19:54,704 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) [2022-11-20 21:19:54,704 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 50 transitions. [2022-11-20 21:19:54,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-11-20 21:19:54,705 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:19:54,705 INFO L195 NwaCegarLoop]: trace histogram [19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 21:19:54,715 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Ended with exit code 0 [2022-11-20 21:19:54,910 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:19:54,910 INFO L420 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:19:54,910 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:19:54,911 INFO L85 PathProgramCache]: Analyzing trace with hash 504858165, now seen corresponding path program 36 times [2022-11-20 21:19:54,911 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:19:54,911 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [286397160] [2022-11-20 21:19:54,911 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:19:54,911 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:19:54,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:19:57,898 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:19:57,898 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:19:57,898 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [286397160] [2022-11-20 21:19:57,898 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [286397160] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 21:19:57,898 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [222238698] [2022-11-20 21:19:57,899 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-20 21:19:57,899 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:19:57,899 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:19:57,900 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 21:19:57,905 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2022-11-20 21:19:57,962 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-20 21:19:57,962 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 21:19:57,965 WARN L261 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 112 conjunts are in the unsatisfiable core [2022-11-20 21:19:57,966 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 21:20:07,027 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:20:07,028 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 21:20:14,804 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:20:14,805 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [222238698] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 21:20:14,805 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1127039871] [2022-11-20 21:20:14,806 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-20 21:20:14,806 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 21:20:14,806 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 21:20:14,806 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 21:20:14,806 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 21:20:14,933 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 21:20:17,937 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 [2022-11-20 21:20:17,937 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 21:20:17,937 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 21:20:17,937 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 136 [2022-11-20 21:20:17,937 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1770662640] [2022-11-20 21:20:17,938 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 21:20:17,938 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 136 states [2022-11-20 21:20:17,938 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:20:17,939 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 136 interpolants. [2022-11-20 21:20:17,940 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=550, Invalid=20330, Unknown=0, NotChecked=0, Total=20880 [2022-11-20 21:20:17,940 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) [2022-11-20 21:20:31,845 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:20:31,845 INFO L93 Difference]: Finished difference Result 79 states and 82 transitions. [2022-11-20 21:20:31,845 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2022-11-20 21:20:31,846 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 [2022-11-20 21:20:31,846 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:20:31,846 INFO L225 Difference]: With dead ends: 79 [2022-11-20 21:20:31,846 INFO L226 Difference]: Without dead ends: 50 [2022-11-20 21:20:31,848 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 214 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 168 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7906 ImplicationChecksByTransitivity, 29.5s TimeCoverageRelationStatistics Valid=930, Invalid=27800, Unknown=0, NotChecked=0, Total=28730 [2022-11-20 21:20:31,848 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 218 mSDsluCounter, 171 mSDsCounter, 0 mSdLazyCounter, 4253 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.3s 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, 3.7s IncrementalHoareTripleChecker+Time [2022-11-20 21:20:31,848 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [218 Valid, 173 Invalid, 4261 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 4253 Invalid, 0 Unknown, 0 Unchecked, 3.7s Time] [2022-11-20 21:20:31,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2022-11-20 21:20:31,898 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2022-11-20 21:20:31,899 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) [2022-11-20 21:20:31,899 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 51 transitions. [2022-11-20 21:20:31,899 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 51 transitions. Word has length 48 [2022-11-20 21:20:31,899 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:20:31,899 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 51 transitions. [2022-11-20 21:20:31,899 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) [2022-11-20 21:20:31,899 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 51 transitions. [2022-11-20 21:20:31,900 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-11-20 21:20:31,900 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:20:31,900 INFO L195 NwaCegarLoop]: trace histogram [20, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 21:20:31,912 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Forceful destruction successful, exit code 0 [2022-11-20 21:20:32,106 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:20:32,107 INFO L420 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:20:32,107 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:20:32,107 INFO L85 PathProgramCache]: Analyzing trace with hash 1371380721, now seen corresponding path program 37 times [2022-11-20 21:20:32,107 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:20:32,108 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [249158478] [2022-11-20 21:20:32,108 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:20:32,108 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:20:32,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:20:34,462 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 171 proven. 229 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:20:34,463 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:20:34,463 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [249158478] [2022-11-20 21:20:34,463 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [249158478] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 21:20:34,463 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1353788638] [2022-11-20 21:20:34,463 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-20 21:20:34,463 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:20:34,463 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:20:34,464 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 21:20:34,467 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2022-11-20 21:20:34,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:20:34,524 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 46 conjunts are in the unsatisfiable core [2022-11-20 21:20:34,526 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 21:20:36,567 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 190 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:20:36,567 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 21:20:38,721 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 210 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:20:38,721 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1353788638] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 21:20:38,721 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [135970230] [2022-11-20 21:20:38,723 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-20 21:20:38,723 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 21:20:38,724 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 21:20:38,724 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 21:20:38,724 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 21:20:38,845 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 21:20:40,416 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 [2022-11-20 21:20:40,416 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 21:20:40,417 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 21:20:40,417 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 45, 45] total 109 [2022-11-20 21:20:40,417 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2031916170] [2022-11-20 21:20:40,417 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 21:20:40,417 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 109 states [2022-11-20 21:20:40,418 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:20:40,418 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 109 interpolants. [2022-11-20 21:20:40,419 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2258, Invalid=11548, Unknown=0, NotChecked=0, Total=13806 [2022-11-20 21:20:40,419 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) [2022-11-20 21:20:42,031 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:20:42,031 INFO L93 Difference]: Finished difference Result 55 states and 56 transitions. [2022-11-20 21:20:42,032 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2022-11-20 21:20:42,032 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 [2022-11-20 21:20:42,032 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:20:42,033 INFO L225 Difference]: With dead ends: 55 [2022-11-20 21:20:42,033 INFO L226 Difference]: Without dead ends: 51 [2022-11-20 21:20:42,034 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 213 GetRequests, 53 SyntacticMatches, 22 SemanticMatches, 138 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10337 ImplicationChecksByTransitivity, 8.2s TimeCoverageRelationStatistics Valid=4383, Invalid=15077, Unknown=0, NotChecked=0, Total=19460 [2022-11-20 21:20:42,035 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 [2022-11-20 21:20:42,035 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] [2022-11-20 21:20:42,035 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2022-11-20 21:20:42,091 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2022-11-20 21:20:42,092 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) [2022-11-20 21:20:42,092 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2022-11-20 21:20:42,092 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 49 [2022-11-20 21:20:42,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:20:42,092 INFO L495 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2022-11-20 21:20:42,093 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) [2022-11-20 21:20:42,093 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2022-11-20 21:20:42,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-11-20 21:20:42,093 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:20:42,093 INFO L195 NwaCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 21:20:42,098 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Forceful destruction successful, exit code 0 [2022-11-20 21:20:42,295 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable42 [2022-11-20 21:20:42,295 INFO L420 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:20:42,295 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:20:42,295 INFO L85 PathProgramCache]: Analyzing trace with hash -446771790, now seen corresponding path program 38 times [2022-11-20 21:20:42,296 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:20:42,296 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [760378712] [2022-11-20 21:20:42,296 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:20:42,296 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:20:42,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:20:45,686 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:20:45,686 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:20:45,686 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [760378712] [2022-11-20 21:20:45,687 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [760378712] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 21:20:45,687 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2041883458] [2022-11-20 21:20:45,687 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 21:20:45,687 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:20:45,687 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:20:45,688 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 21:20:45,691 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2022-11-20 21:20:45,767 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2022-11-20 21:20:45,767 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 21:20:45,770 WARN L261 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 116 conjunts are in the unsatisfiable core [2022-11-20 21:20:45,773 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 21:20:56,883 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:20:56,883 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 21:21:05,083 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:21:05,083 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2041883458] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 21:21:05,083 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [688863076] [2022-11-20 21:21:05,084 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-20 21:21:05,084 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 21:21:05,085 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 21:21:05,085 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 21:21:05,085 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 21:21:05,225 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 21:21:08,294 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 [2022-11-20 21:21:08,294 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 21:21:08,294 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 21:21:08,294 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 142 [2022-11-20 21:21:08,294 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1360576716] [2022-11-20 21:21:08,294 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 21:21:08,295 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 142 states [2022-11-20 21:21:08,295 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:21:08,295 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 142 interpolants. [2022-11-20 21:21:08,296 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=574, Invalid=22076, Unknown=0, NotChecked=0, Total=22650 [2022-11-20 21:21:08,296 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) [2022-11-20 21:21:21,563 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:21:21,563 INFO L93 Difference]: Finished difference Result 82 states and 85 transitions. [2022-11-20 21:21:21,563 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2022-11-20 21:21:21,563 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 [2022-11-20 21:21:21,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:21:21,564 INFO L225 Difference]: With dead ends: 82 [2022-11-20 21:21:21,564 INFO L226 Difference]: Without dead ends: 52 [2022-11-20 21:21:21,565 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 223 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 175 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8589 ImplicationChecksByTransitivity, 31.4s TimeCoverageRelationStatistics Valid=970, Invalid=30182, Unknown=0, NotChecked=0, Total=31152 [2022-11-20 21:21:21,565 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 223 mSDsluCounter, 186 mSDsCounter, 0 mSdLazyCounter, 4694 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.3s 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, 3.7s IncrementalHoareTripleChecker+Time [2022-11-20 21:21:21,565 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [223 Valid, 188 Invalid, 4702 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 4694 Invalid, 0 Unknown, 0 Unchecked, 3.7s Time] [2022-11-20 21:21:21,566 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2022-11-20 21:21:21,614 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2022-11-20 21:21:21,614 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) [2022-11-20 21:21:21,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 53 transitions. [2022-11-20 21:21:21,615 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 53 transitions. Word has length 50 [2022-11-20 21:21:21,615 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:21:21,615 INFO L495 AbstractCegarLoop]: Abstraction has 52 states and 53 transitions. [2022-11-20 21:21:21,615 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) [2022-11-20 21:21:21,615 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 53 transitions. [2022-11-20 21:21:21,615 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2022-11-20 21:21:21,615 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:21:21,615 INFO L195 NwaCegarLoop]: trace histogram [21, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 21:21:21,628 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Ended with exit code 0 [2022-11-20 21:21:21,816 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable43 [2022-11-20 21:21:21,816 INFO L420 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:21:21,816 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:21:21,816 INFO L85 PathProgramCache]: Analyzing trace with hash -942250898, now seen corresponding path program 39 times [2022-11-20 21:21:21,817 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:21:21,817 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1647264352] [2022-11-20 21:21:21,817 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:21:21,817 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:21:21,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:21:23,813 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 190 proven. 251 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:21:23,813 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:21:23,813 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1647264352] [2022-11-20 21:21:23,813 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1647264352] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 21:21:23,813 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [922570409] [2022-11-20 21:21:23,813 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-20 21:21:23,814 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:21:23,814 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:21:23,814 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 21:21:23,817 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2022-11-20 21:21:23,886 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-20 21:21:23,886 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 21:21:23,888 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 48 conjunts are in the unsatisfiable core [2022-11-20 21:21:23,890 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 21:21:26,005 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 210 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:21:26,005 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 21:21:28,220 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 231 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:21:28,220 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [922570409] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 21:21:28,221 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1568194200] [2022-11-20 21:21:28,222 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-20 21:21:28,222 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 21:21:28,222 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 21:21:28,222 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 21:21:28,222 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 21:21:28,351 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 21:21:29,847 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 [2022-11-20 21:21:29,847 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 21:21:29,847 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 21:21:29,847 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 47, 47] total 114 [2022-11-20 21:21:29,847 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [456305981] [2022-11-20 21:21:29,847 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 21:21:29,847 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 114 states [2022-11-20 21:21:29,848 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:21:29,848 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 114 interpolants. [2022-11-20 21:21:29,849 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2463, Invalid=12543, Unknown=0, NotChecked=0, Total=15006 [2022-11-20 21:21:29,849 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) [2022-11-20 21:21:31,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:21:31,561 INFO L93 Difference]: Finished difference Result 57 states and 58 transitions. [2022-11-20 21:21:31,561 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2022-11-20 21:21:31,561 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 [2022-11-20 21:21:31,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:21:31,562 INFO L225 Difference]: With dead ends: 57 [2022-11-20 21:21:31,562 INFO L226 Difference]: Without dead ends: 53 [2022-11-20 21:21:31,563 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 222 GetRequests, 55 SyntacticMatches, 23 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11281 ImplicationChecksByTransitivity, 8.1s TimeCoverageRelationStatistics Valid=4788, Invalid=16382, Unknown=0, NotChecked=0, Total=21170 [2022-11-20 21:21:31,564 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 [2022-11-20 21:21:31,564 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] [2022-11-20 21:21:31,564 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2022-11-20 21:21:31,625 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2022-11-20 21:21:31,625 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) [2022-11-20 21:21:31,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 54 transitions. [2022-11-20 21:21:31,625 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 54 transitions. Word has length 51 [2022-11-20 21:21:31,625 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:21:31,625 INFO L495 AbstractCegarLoop]: Abstraction has 53 states and 54 transitions. [2022-11-20 21:21:31,626 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) [2022-11-20 21:21:31,626 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 54 transitions. [2022-11-20 21:21:31,626 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2022-11-20 21:21:31,626 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:21:31,626 INFO L195 NwaCegarLoop]: trace histogram [21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 21:21:31,631 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Forceful destruction successful, exit code 0 [2022-11-20 21:21:31,826 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable44 [2022-11-20 21:21:31,827 INFO L420 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:21:31,827 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:21:31,827 INFO L85 PathProgramCache]: Analyzing trace with hash 845092053, now seen corresponding path program 40 times [2022-11-20 21:21:31,827 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:21:31,827 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1257295014] [2022-11-20 21:21:31,827 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:21:31,827 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:21:31,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:21:35,046 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 462 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:21:35,046 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:21:35,047 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1257295014] [2022-11-20 21:21:35,047 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1257295014] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 21:21:35,047 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1280957215] [2022-11-20 21:21:35,047 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-20 21:21:35,047 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:21:35,047 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:21:35,048 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 21:21:35,050 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2022-11-20 21:21:35,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:21:35,108 WARN L261 TraceCheckSpWp]: Trace formula consists of 202 conjuncts, 118 conjunts are in the unsatisfiable core [2022-11-20 21:21:35,110 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 21:21:45,984 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 462 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:21:45,985 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 21:21:53,513 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 462 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:21:53,513 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1280957215] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 21:21:53,513 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1320887966] [2022-11-20 21:21:53,514 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-20 21:21:53,514 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 21:21:53,515 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 21:21:53,515 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 21:21:53,515 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 21:21:53,647 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 21:21:56,535 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 [2022-11-20 21:21:56,535 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 21:21:56,535 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 21:21:56,536 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 147 [2022-11-20 21:21:56,536 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [35952897] [2022-11-20 21:21:56,536 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 21:21:56,537 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 147 states [2022-11-20 21:21:56,537 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:21:56,537 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 147 interpolants. [2022-11-20 21:21:56,539 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=595, Invalid=23585, Unknown=0, NotChecked=0, Total=24180 [2022-11-20 21:21:56,539 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) [2022-11-20 21:22:12,879 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:22:12,879 INFO L93 Difference]: Finished difference Result 85 states and 88 transitions. [2022-11-20 21:22:12,879 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2022-11-20 21:22:12,880 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 [2022-11-20 21:22:12,880 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:22:12,880 INFO L225 Difference]: With dead ends: 85 [2022-11-20 21:22:12,880 INFO L226 Difference]: Without dead ends: 54 [2022-11-20 21:22:12,881 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 234 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 183 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9289 ImplicationChecksByTransitivity, 33.5s TimeCoverageRelationStatistics Valid=1125, Invalid=32915, Unknown=0, NotChecked=0, Total=34040 [2022-11-20 21:22:12,882 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 [2022-11-20 21:22:12,882 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] [2022-11-20 21:22:12,882 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2022-11-20 21:22:12,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2022-11-20 21:22:12,930 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) [2022-11-20 21:22:12,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 55 transitions. [2022-11-20 21:22:12,930 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 55 transitions. Word has length 52 [2022-11-20 21:22:12,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:22:12,930 INFO L495 AbstractCegarLoop]: Abstraction has 54 states and 55 transitions. [2022-11-20 21:22:12,931 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) [2022-11-20 21:22:12,931 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 55 transitions. [2022-11-20 21:22:12,931 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2022-11-20 21:22:12,931 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:22:12,931 INFO L195 NwaCegarLoop]: trace histogram [22, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 21:22:12,936 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Forceful destruction successful, exit code 0 [2022-11-20 21:22:13,132 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45,43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:22:13,133 INFO L420 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:22:13,133 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:22:13,133 INFO L85 PathProgramCache]: Analyzing trace with hash 1431039121, now seen corresponding path program 41 times [2022-11-20 21:22:13,133 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:22:13,133 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [147057904] [2022-11-20 21:22:13,133 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:22:13,133 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:22:13,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:22:15,166 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 210 proven. 274 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:22:15,166 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:22:15,166 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [147057904] [2022-11-20 21:22:15,166 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [147057904] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 21:22:15,166 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2101060811] [2022-11-20 21:22:15,166 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 21:22:15,167 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:22:15,167 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:22:15,168 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 21:22:15,172 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2022-11-20 21:22:15,238 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2022-11-20 21:22:15,239 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 21:22:15,241 INFO L263 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 50 conjunts are in the unsatisfiable core [2022-11-20 21:22:15,242 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 21:22:17,468 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 231 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:22:17,468 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 21:22:19,712 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 253 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:22:19,712 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2101060811] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 21:22:19,712 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1982232687] [2022-11-20 21:22:19,713 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-20 21:22:19,713 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 21:22:19,713 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 21:22:19,713 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 21:22:19,713 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 21:22:19,817 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 21:22:21,330 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 [2022-11-20 21:22:21,330 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 21:22:21,330 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 21:22:21,330 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 49, 49] total 119 [2022-11-20 21:22:21,330 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1479871291] [2022-11-20 21:22:21,330 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 21:22:21,331 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 119 states [2022-11-20 21:22:21,331 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:22:21,331 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 119 interpolants. [2022-11-20 21:22:21,332 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2677, Invalid=13579, Unknown=0, NotChecked=0, Total=16256 [2022-11-20 21:22:21,332 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) [2022-11-20 21:22:23,181 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:22:23,181 INFO L93 Difference]: Finished difference Result 59 states and 60 transitions. [2022-11-20 21:22:23,181 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2022-11-20 21:22:23,182 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 [2022-11-20 21:22:23,182 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:22:23,182 INFO L225 Difference]: With dead ends: 59 [2022-11-20 21:22:23,182 INFO L226 Difference]: Without dead ends: 55 [2022-11-20 21:22:23,183 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 57 SyntacticMatches, 24 SemanticMatches, 150 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12266 ImplicationChecksByTransitivity, 8.4s TimeCoverageRelationStatistics Valid=5211, Invalid=17741, Unknown=0, NotChecked=0, Total=22952 [2022-11-20 21:22:23,184 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 [2022-11-20 21:22:23,184 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] [2022-11-20 21:22:23,185 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2022-11-20 21:22:23,238 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2022-11-20 21:22:23,238 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) [2022-11-20 21:22:23,238 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 56 transitions. [2022-11-20 21:22:23,238 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 56 transitions. Word has length 53 [2022-11-20 21:22:23,238 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:22:23,238 INFO L495 AbstractCegarLoop]: Abstraction has 55 states and 56 transitions. [2022-11-20 21:22:23,239 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) [2022-11-20 21:22:23,239 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 56 transitions. [2022-11-20 21:22:23,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2022-11-20 21:22:23,239 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:22:23,239 INFO L195 NwaCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 21:22:23,244 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Forceful destruction successful, exit code 0 [2022-11-20 21:22:23,439 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46,44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:22:23,440 INFO L420 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:22:23,440 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:22:23,440 INFO L85 PathProgramCache]: Analyzing trace with hash 1402638610, now seen corresponding path program 42 times [2022-11-20 21:22:23,440 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:22:23,440 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [351274640] [2022-11-20 21:22:23,440 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:22:23,440 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:22:23,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:22:26,657 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:22:26,657 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:22:26,657 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [351274640] [2022-11-20 21:22:26,658 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [351274640] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 21:22:26,658 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2005470537] [2022-11-20 21:22:26,658 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-20 21:22:26,658 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:22:26,658 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:22:26,659 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 21:22:26,661 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2022-11-20 21:22:26,717 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-20 21:22:26,717 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 21:22:26,720 WARN L261 TraceCheckSpWp]: Trace formula consists of 208 conjuncts, 124 conjunts are in the unsatisfiable core [2022-11-20 21:22:26,721 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 21:22:38,049 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:22:38,049 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 21:22:46,803 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:22:46,803 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2005470537] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 21:22:46,803 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1228787955] [2022-11-20 21:22:46,804 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-20 21:22:46,804 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 21:22:46,804 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 21:22:46,805 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 21:22:46,805 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 21:22:46,912 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 21:22:49,922 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 [2022-11-20 21:22:49,922 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 21:22:49,922 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 21:22:49,922 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 154 [2022-11-20 21:22:49,923 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1030027031] [2022-11-20 21:22:49,923 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 21:22:49,923 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 154 states [2022-11-20 21:22:49,923 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:22:49,924 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 154 interpolants. [2022-11-20 21:22:49,925 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=622, Invalid=25784, Unknown=0, NotChecked=0, Total=26406 [2022-11-20 21:22:49,925 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) [2022-11-20 21:23:05,268 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:23:05,268 INFO L93 Difference]: Finished difference Result 88 states and 91 transitions. [2022-11-20 21:23:05,268 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2022-11-20 21:23:05,268 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 [2022-11-20 21:23:05,269 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:23:05,269 INFO L225 Difference]: With dead ends: 88 [2022-11-20 21:23:05,269 INFO L226 Difference]: Without dead ends: 56 [2022-11-20 21:23:05,271 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 241 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 189 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10039 ImplicationChecksByTransitivity, 33.6s TimeCoverageRelationStatistics Valid=1050, Invalid=35240, Unknown=0, NotChecked=0, Total=36290 [2022-11-20 21:23:05,271 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 224 mSDsluCounter, 213 mSDsCounter, 0 mSdLazyCounter, 5734 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.9s 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, 4.4s IncrementalHoareTripleChecker+Time [2022-11-20 21:23:05,272 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [224 Valid, 215 Invalid, 5742 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 5734 Invalid, 0 Unknown, 0 Unchecked, 4.4s Time] [2022-11-20 21:23:05,272 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2022-11-20 21:23:05,322 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2022-11-20 21:23:05,322 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) [2022-11-20 21:23:05,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 57 transitions. [2022-11-20 21:23:05,323 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 57 transitions. Word has length 54 [2022-11-20 21:23:05,323 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:23:05,323 INFO L495 AbstractCegarLoop]: Abstraction has 56 states and 57 transitions. [2022-11-20 21:23:05,323 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) [2022-11-20 21:23:05,323 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 57 transitions. [2022-11-20 21:23:05,323 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-11-20 21:23:05,323 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:23:05,323 INFO L195 NwaCegarLoop]: trace histogram [23, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 21:23:05,328 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Forceful destruction successful, exit code 0 [2022-11-20 21:23:05,524 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2022-11-20 21:23:05,524 INFO L420 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:23:05,524 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:23:05,524 INFO L85 PathProgramCache]: Analyzing trace with hash 1857055182, now seen corresponding path program 43 times [2022-11-20 21:23:05,524 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:23:05,524 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1806904353] [2022-11-20 21:23:05,525 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:23:05,525 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:23:05,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:23:07,692 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 231 proven. 298 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:23:07,692 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:23:07,692 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1806904353] [2022-11-20 21:23:07,692 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1806904353] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 21:23:07,692 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1437506585] [2022-11-20 21:23:07,693 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-20 21:23:07,693 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:23:07,693 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:23:07,694 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 21:23:07,708 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2022-11-20 21:23:07,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:23:07,765 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 52 conjunts are in the unsatisfiable core [2022-11-20 21:23:07,767 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 21:23:10,181 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 253 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:23:10,181 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 21:23:12,599 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 276 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:23:12,599 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1437506585] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 21:23:12,599 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [447008116] [2022-11-20 21:23:12,600 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-20 21:23:12,600 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 21:23:12,600 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 21:23:12,601 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 21:23:12,601 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 21:23:12,717 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 21:23:14,287 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 [2022-11-20 21:23:14,288 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 21:23:14,288 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 21:23:14,288 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 51, 51] total 124 [2022-11-20 21:23:14,288 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [831500910] [2022-11-20 21:23:14,288 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 21:23:14,288 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 124 states [2022-11-20 21:23:14,288 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:23:14,289 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 124 interpolants. [2022-11-20 21:23:14,290 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2900, Invalid=14656, Unknown=0, NotChecked=0, Total=17556 [2022-11-20 21:23:14,290 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) [2022-11-20 21:23:16,163 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:23:16,163 INFO L93 Difference]: Finished difference Result 61 states and 62 transitions. [2022-11-20 21:23:16,163 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2022-11-20 21:23:16,163 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 [2022-11-20 21:23:16,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:23:16,164 INFO L225 Difference]: With dead ends: 61 [2022-11-20 21:23:16,164 INFO L226 Difference]: Without dead ends: 57 [2022-11-20 21:23:16,165 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 59 SyntacticMatches, 25 SemanticMatches, 156 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13292 ImplicationChecksByTransitivity, 8.9s TimeCoverageRelationStatistics Valid=5652, Invalid=19154, Unknown=0, NotChecked=0, Total=24806 [2022-11-20 21:23:16,165 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 [2022-11-20 21:23:16,166 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] [2022-11-20 21:23:16,166 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2022-11-20 21:23:16,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2022-11-20 21:23:16,217 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) [2022-11-20 21:23:16,218 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 58 transitions. [2022-11-20 21:23:16,218 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 58 transitions. Word has length 55 [2022-11-20 21:23:16,218 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:23:16,218 INFO L495 AbstractCegarLoop]: Abstraction has 57 states and 58 transitions. [2022-11-20 21:23:16,218 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) [2022-11-20 21:23:16,219 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 58 transitions. [2022-11-20 21:23:16,219 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2022-11-20 21:23:16,219 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:23:16,219 INFO L195 NwaCegarLoop]: trace histogram [23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 21:23:16,229 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Ended with exit code 0 [2022-11-20 21:23:16,424 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable48 [2022-11-20 21:23:16,425 INFO L420 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:23:16,425 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:23:16,425 INFO L85 PathProgramCache]: Analyzing trace with hash 1724234613, now seen corresponding path program 44 times [2022-11-20 21:23:16,425 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:23:16,425 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1008171634] [2022-11-20 21:23:16,425 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:23:16,425 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:23:16,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:23:19,815 INFO L134 CoverageAnalysis]: Checked inductivity of 552 backedges. 0 proven. 552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:23:19,815 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:23:19,815 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1008171634] [2022-11-20 21:23:19,815 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1008171634] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 21:23:19,815 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1202870409] [2022-11-20 21:23:19,815 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 21:23:19,815 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:23:19,815 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:23:19,816 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 21:23:19,818 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2022-11-20 21:23:19,890 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2022-11-20 21:23:19,891 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 21:23:19,894 WARN L261 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 128 conjunts are in the unsatisfiable core [2022-11-20 21:23:19,895 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 21:23:32,178 INFO L134 CoverageAnalysis]: Checked inductivity of 552 backedges. 0 proven. 552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:23:32,178 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 21:23:41,875 INFO L134 CoverageAnalysis]: Checked inductivity of 552 backedges. 0 proven. 552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:23:41,875 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1202870409] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 21:23:41,875 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1839462447] [2022-11-20 21:23:41,876 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-20 21:23:41,876 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 21:23:41,876 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 21:23:41,876 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 21:23:41,877 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 21:23:41,977 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 21:23:45,123 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 [2022-11-20 21:23:45,124 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 21:23:45,124 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 21:23:45,124 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 55, 55] total 160 [2022-11-20 21:23:45,124 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1331308566] [2022-11-20 21:23:45,124 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 21:23:45,125 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 160 states [2022-11-20 21:23:45,125 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:23:45,125 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 160 interpolants. [2022-11-20 21:23:45,126 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=646, Invalid=27746, Unknown=0, NotChecked=0, Total=28392 [2022-11-20 21:23:45,126 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) [2022-11-20 21:24:01,468 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:24:01,468 INFO L93 Difference]: Finished difference Result 91 states and 94 transitions. [2022-11-20 21:24:01,468 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2022-11-20 21:24:01,469 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 [2022-11-20 21:24:01,469 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:24:01,469 INFO L225 Difference]: With dead ends: 91 [2022-11-20 21:24:01,469 INFO L226 Difference]: Without dead ends: 58 [2022-11-20 21:24:01,471 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 250 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 196 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10806 ImplicationChecksByTransitivity, 36.9s TimeCoverageRelationStatistics Valid=1090, Invalid=37916, Unknown=0, NotChecked=0, Total=39006 [2022-11-20 21:24:01,471 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 250 mSDsluCounter, 184 mSDsCounter, 0 mSdLazyCounter, 5635 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.7s 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, 4.2s IncrementalHoareTripleChecker+Time [2022-11-20 21:24:01,472 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [250 Valid, 186 Invalid, 5643 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 5635 Invalid, 0 Unknown, 0 Unchecked, 4.2s Time] [2022-11-20 21:24:01,472 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2022-11-20 21:24:01,524 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2022-11-20 21:24:01,525 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) [2022-11-20 21:24:01,525 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 59 transitions. [2022-11-20 21:24:01,525 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 59 transitions. Word has length 56 [2022-11-20 21:24:01,525 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:24:01,525 INFO L495 AbstractCegarLoop]: Abstraction has 58 states and 59 transitions. [2022-11-20 21:24:01,526 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) [2022-11-20 21:24:01,526 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 59 transitions. [2022-11-20 21:24:01,526 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2022-11-20 21:24:01,526 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:24:01,526 INFO L195 NwaCegarLoop]: trace histogram [24, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 21:24:01,532 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Forceful destruction successful, exit code 0 [2022-11-20 21:24:01,730 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable49,47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:24:01,730 INFO L420 AbstractCegarLoop]: === Iteration 51 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:24:01,730 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:24:01,730 INFO L85 PathProgramCache]: Analyzing trace with hash 331896113, now seen corresponding path program 45 times [2022-11-20 21:24:01,731 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:24:01,731 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1297961948] [2022-11-20 21:24:01,731 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:24:01,731 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:24:01,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:24:04,070 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 253 proven. 323 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:24:04,070 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:24:04,070 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1297961948] [2022-11-20 21:24:04,070 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1297961948] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 21:24:04,070 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [130833444] [2022-11-20 21:24:04,070 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-20 21:24:04,071 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:24:04,071 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:24:04,071 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 21:24:04,074 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Waiting until timeout for monitored process [2022-11-20 21:24:04,131 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-20 21:24:04,131 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 21:24:04,133 INFO L263 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 54 conjunts are in the unsatisfiable core [2022-11-20 21:24:04,134 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 21:24:06,672 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 276 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:24:06,672 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 21:24:09,285 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 300 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:24:09,285 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [130833444] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 21:24:09,285 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [369354242] [2022-11-20 21:24:09,286 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-20 21:24:09,286 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 21:24:09,286 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 21:24:09,287 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 21:24:09,287 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 21:24:09,390 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 21:24:10,966 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 [2022-11-20 21:24:10,967 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 21:24:10,967 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 21:24:10,967 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 53, 53] total 129 [2022-11-20 21:24:10,967 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [209651694] [2022-11-20 21:24:10,967 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 21:24:10,968 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 129 states [2022-11-20 21:24:10,968 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:24:10,969 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 129 interpolants. [2022-11-20 21:24:10,970 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3132, Invalid=15774, Unknown=0, NotChecked=0, Total=18906 [2022-11-20 21:24:10,970 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) [2022-11-20 21:24:12,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:24:12,966 INFO L93 Difference]: Finished difference Result 63 states and 64 transitions. [2022-11-20 21:24:12,966 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2022-11-20 21:24:12,966 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 [2022-11-20 21:24:12,967 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:24:12,967 INFO L225 Difference]: With dead ends: 63 [2022-11-20 21:24:12,967 INFO L226 Difference]: Without dead ends: 59 [2022-11-20 21:24:12,969 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 249 GetRequests, 61 SyntacticMatches, 26 SemanticMatches, 162 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14359 ImplicationChecksByTransitivity, 9.5s TimeCoverageRelationStatistics Valid=6111, Invalid=20621, Unknown=0, NotChecked=0, Total=26732 [2022-11-20 21:24:12,969 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 [2022-11-20 21:24:12,969 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] [2022-11-20 21:24:12,970 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2022-11-20 21:24:13,039 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2022-11-20 21:24:13,039 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) [2022-11-20 21:24:13,039 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 60 transitions. [2022-11-20 21:24:13,039 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 60 transitions. Word has length 57 [2022-11-20 21:24:13,040 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:24:13,040 INFO L495 AbstractCegarLoop]: Abstraction has 59 states and 60 transitions. [2022-11-20 21:24:13,040 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) [2022-11-20 21:24:13,040 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 60 transitions. [2022-11-20 21:24:13,041 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-11-20 21:24:13,041 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:24:13,041 INFO L195 NwaCegarLoop]: trace histogram [24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 21:24:13,045 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Forceful destruction successful, exit code 0 [2022-11-20 21:24:13,241 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50,48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:24:13,241 INFO L420 AbstractCegarLoop]: === Iteration 52 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:24:13,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:24:13,242 INFO L85 PathProgramCache]: Analyzing trace with hash 1688943730, now seen corresponding path program 46 times [2022-11-20 21:24:13,242 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:24:13,242 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [905927487] [2022-11-20 21:24:13,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:24:13,242 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:24:13,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:24:16,811 INFO L134 CoverageAnalysis]: Checked inductivity of 600 backedges. 0 proven. 600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:24:16,811 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:24:16,812 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [905927487] [2022-11-20 21:24:16,812 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [905927487] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 21:24:16,812 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [457813608] [2022-11-20 21:24:16,812 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-20 21:24:16,812 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:24:16,812 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:24:16,813 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 21:24:16,840 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Waiting until timeout for monitored process [2022-11-20 21:24:16,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:24:16,886 WARN L261 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 130 conjunts are in the unsatisfiable core [2022-11-20 21:24:16,888 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 21:24:28,026 INFO L134 CoverageAnalysis]: Checked inductivity of 600 backedges. 0 proven. 600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:24:28,026 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 21:24:37,229 INFO L134 CoverageAnalysis]: Checked inductivity of 600 backedges. 0 proven. 600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:24:37,229 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [457813608] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 21:24:37,229 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1170247357] [2022-11-20 21:24:37,230 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-20 21:24:37,230 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 21:24:37,231 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 21:24:37,231 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 21:24:37,231 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 21:24:37,343 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 21:24:40,430 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 [2022-11-20 21:24:40,430 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 21:24:40,430 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 21:24:40,430 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 57, 57] total 165 [2022-11-20 21:24:40,431 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1943496289] [2022-11-20 21:24:40,431 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 21:24:40,431 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 165 states [2022-11-20 21:24:40,431 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:24:40,431 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 165 interpolants. [2022-11-20 21:24:40,433 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=667, Invalid=29435, Unknown=0, NotChecked=0, Total=30102 [2022-11-20 21:24:40,433 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) [2022-11-20 21:24:59,508 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:24:59,508 INFO L93 Difference]: Finished difference Result 94 states and 97 transitions. [2022-11-20 21:24:59,508 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2022-11-20 21:24:59,508 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 [2022-11-20 21:24:59,509 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:24:59,509 INFO L225 Difference]: With dead ends: 94 [2022-11-20 21:24:59,509 INFO L226 Difference]: Without dead ends: 60 [2022-11-20 21:24:59,510 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 261 GetRequests, 56 SyntacticMatches, 1 SemanticMatches, 204 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11642 ImplicationChecksByTransitivity, 38.4s TimeCoverageRelationStatistics Valid=1257, Invalid=40973, Unknown=0, NotChecked=0, Total=42230 [2022-11-20 21:24:59,511 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 360 mSDsluCounter, 170 mSDsCounter, 0 mSdLazyCounter, 5840 mSolverCounterSat, 109 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.8s 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, 4.3s IncrementalHoareTripleChecker+Time [2022-11-20 21:24:59,511 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [360 Valid, 172 Invalid, 5949 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [109 Valid, 5840 Invalid, 0 Unknown, 0 Unchecked, 4.3s Time] [2022-11-20 21:24:59,512 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2022-11-20 21:24:59,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2022-11-20 21:24:59,622 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) [2022-11-20 21:24:59,622 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2022-11-20 21:24:59,623 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 58 [2022-11-20 21:24:59,623 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:24:59,623 INFO L495 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2022-11-20 21:24:59,623 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) [2022-11-20 21:24:59,623 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2022-11-20 21:24:59,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-11-20 21:24:59,624 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:24:59,624 INFO L195 NwaCegarLoop]: trace histogram [25, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 21:24:59,630 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Forceful destruction successful, exit code 0 [2022-11-20 21:24:59,830 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51,49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:24:59,830 INFO L420 AbstractCegarLoop]: === Iteration 53 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:24:59,830 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:24:59,830 INFO L85 PathProgramCache]: Analyzing trace with hash -613525714, now seen corresponding path program 47 times [2022-11-20 21:24:59,830 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:24:59,830 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [151418225] [2022-11-20 21:24:59,831 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:24:59,831 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:24:59,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:25:02,364 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 276 proven. 349 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:25:02,364 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:25:02,364 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [151418225] [2022-11-20 21:25:02,364 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [151418225] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 21:25:02,364 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [568850057] [2022-11-20 21:25:02,365 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 21:25:02,365 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:25:02,365 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:25:02,367 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 21:25:02,377 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Waiting until timeout for monitored process [2022-11-20 21:25:02,445 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2022-11-20 21:25:02,446 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 21:25:02,448 INFO L263 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 56 conjunts are in the unsatisfiable core [2022-11-20 21:25:02,449 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 21:25:05,190 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 300 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:25:05,191 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 21:25:07,954 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 325 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:25:07,954 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [568850057] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 21:25:07,954 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1504891713] [2022-11-20 21:25:07,955 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-20 21:25:07,955 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 21:25:07,955 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 21:25:07,955 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 21:25:07,955 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 21:25:08,092 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 21:25:09,677 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 [2022-11-20 21:25:09,677 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 21:25:09,677 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 21:25:09,677 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 55, 55] total 134 [2022-11-20 21:25:09,677 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [990394042] [2022-11-20 21:25:09,678 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 21:25:09,678 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 134 states [2022-11-20 21:25:09,678 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:25:09,679 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 134 interpolants. [2022-11-20 21:25:09,680 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3373, Invalid=16933, Unknown=0, NotChecked=0, Total=20306 [2022-11-20 21:25:09,680 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) [2022-11-20 21:25:11,795 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:25:11,795 INFO L93 Difference]: Finished difference Result 65 states and 66 transitions. [2022-11-20 21:25:11,796 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2022-11-20 21:25:11,796 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 [2022-11-20 21:25:11,796 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:25:11,796 INFO L225 Difference]: With dead ends: 65 [2022-11-20 21:25:11,796 INFO L226 Difference]: Without dead ends: 61 [2022-11-20 21:25:11,798 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 258 GetRequests, 63 SyntacticMatches, 27 SemanticMatches, 168 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15467 ImplicationChecksByTransitivity, 10.0s TimeCoverageRelationStatistics Valid=6588, Invalid=22142, Unknown=0, NotChecked=0, Total=28730 [2022-11-20 21:25:11,798 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 [2022-11-20 21:25:11,798 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] [2022-11-20 21:25:11,799 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2022-11-20 21:25:11,855 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2022-11-20 21:25:11,856 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) [2022-11-20 21:25:11,856 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 62 transitions. [2022-11-20 21:25:11,856 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 62 transitions. Word has length 59 [2022-11-20 21:25:11,856 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:25:11,856 INFO L495 AbstractCegarLoop]: Abstraction has 61 states and 62 transitions. [2022-11-20 21:25:11,856 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) [2022-11-20 21:25:11,856 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 62 transitions. [2022-11-20 21:25:11,857 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2022-11-20 21:25:11,857 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:25:11,857 INFO L195 NwaCegarLoop]: trace histogram [25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 21:25:11,861 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Forceful destruction successful, exit code 0 [2022-11-20 21:25:12,057 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52,50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:25:12,057 INFO L420 AbstractCegarLoop]: === Iteration 54 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:25:12,057 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:25:12,058 INFO L85 PathProgramCache]: Analyzing trace with hash -1849329131, now seen corresponding path program 48 times [2022-11-20 21:25:12,058 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:25:12,058 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1641341539] [2022-11-20 21:25:12,058 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:25:12,058 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:25:12,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:25:15,828 INFO L134 CoverageAnalysis]: Checked inductivity of 650 backedges. 0 proven. 650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:25:15,828 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:25:15,829 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1641341539] [2022-11-20 21:25:15,829 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1641341539] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 21:25:15,829 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [736832265] [2022-11-20 21:25:15,829 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-20 21:25:15,829 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:25:15,829 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:25:15,830 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 21:25:15,832 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Waiting until timeout for monitored process [2022-11-20 21:25:15,894 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-20 21:25:15,894 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 21:25:15,897 WARN L261 TraceCheckSpWp]: Trace formula consists of 226 conjuncts, 136 conjunts are in the unsatisfiable core [2022-11-20 21:25:15,900 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 21:25:28,321 INFO L134 CoverageAnalysis]: Checked inductivity of 650 backedges. 0 proven. 650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:25:28,321 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 21:25:39,082 INFO L134 CoverageAnalysis]: Checked inductivity of 650 backedges. 0 proven. 650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:25:39,082 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [736832265] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 21:25:39,082 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [948953995] [2022-11-20 21:25:39,083 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-20 21:25:39,083 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 21:25:39,083 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 21:25:39,083 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 21:25:39,083 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 21:25:39,204 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 21:25:42,457 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 [2022-11-20 21:25:42,457 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 21:25:42,457 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 21:25:42,457 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59, 59] total 172 [2022-11-20 21:25:42,457 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1635429050] [2022-11-20 21:25:42,457 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 21:25:42,458 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 172 states [2022-11-20 21:25:42,458 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:25:42,459 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 172 interpolants. [2022-11-20 21:25:42,460 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=694, Invalid=31886, Unknown=0, NotChecked=0, Total=32580 [2022-11-20 21:25:42,460 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) [2022-11-20 21:25:59,820 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:25:59,820 INFO L93 Difference]: Finished difference Result 97 states and 100 transitions. [2022-11-20 21:25:59,821 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2022-11-20 21:25:59,821 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 [2022-11-20 21:25:59,821 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:25:59,822 INFO L225 Difference]: With dead ends: 97 [2022-11-20 21:25:59,822 INFO L226 Difference]: Without dead ends: 62 [2022-11-20 21:25:59,823 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 268 GetRequests, 58 SyntacticMatches, 0 SemanticMatches, 210 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12424 ImplicationChecksByTransitivity, 38.7s TimeCoverageRelationStatistics Valid=1170, Invalid=43562, Unknown=0, NotChecked=0, Total=44732 [2022-11-20 21:25:59,824 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 241 mSDsluCounter, 197 mSDsCounter, 0 mSdLazyCounter, 6436 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.4s 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, 5.0s IncrementalHoareTripleChecker+Time [2022-11-20 21:25:59,824 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [241 Valid, 199 Invalid, 6444 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 6436 Invalid, 0 Unknown, 0 Unchecked, 5.0s Time] [2022-11-20 21:25:59,824 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2022-11-20 21:25:59,886 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 62. [2022-11-20 21:25:59,886 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) [2022-11-20 21:25:59,886 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 63 transitions. [2022-11-20 21:25:59,887 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 63 transitions. Word has length 60 [2022-11-20 21:25:59,887 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:25:59,887 INFO L495 AbstractCegarLoop]: Abstraction has 62 states and 63 transitions. [2022-11-20 21:25:59,887 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) [2022-11-20 21:25:59,887 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 63 transitions. [2022-11-20 21:25:59,887 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-11-20 21:25:59,887 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:25:59,888 INFO L195 NwaCegarLoop]: trace histogram [26, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 21:25:59,896 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Forceful destruction successful, exit code 0 [2022-11-20 21:26:00,088 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable53 [2022-11-20 21:26:00,088 INFO L420 AbstractCegarLoop]: === Iteration 55 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:26:00,088 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:26:00,088 INFO L85 PathProgramCache]: Analyzing trace with hash 1680659921, now seen corresponding path program 49 times [2022-11-20 21:26:00,088 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:26:00,089 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1559046871] [2022-11-20 21:26:00,089 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:26:00,089 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:26:00,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:26:02,769 INFO L134 CoverageAnalysis]: Checked inductivity of 676 backedges. 300 proven. 376 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:26:02,770 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:26:02,770 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1559046871] [2022-11-20 21:26:02,770 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1559046871] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 21:26:02,770 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1879673441] [2022-11-20 21:26:02,770 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-20 21:26:02,770 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:26:02,770 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:26:02,771 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 21:26:02,773 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Waiting until timeout for monitored process [2022-11-20 21:26:02,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:26:02,846 INFO L263 TraceCheckSpWp]: Trace formula consists of 229 conjuncts, 58 conjunts are in the unsatisfiable core [2022-11-20 21:26:02,848 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 21:26:05,732 INFO L134 CoverageAnalysis]: Checked inductivity of 676 backedges. 325 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:26:05,732 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 21:26:08,744 INFO L134 CoverageAnalysis]: Checked inductivity of 676 backedges. 351 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:26:08,744 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1879673441] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 21:26:08,744 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [979783] [2022-11-20 21:26:08,745 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-20 21:26:08,746 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 21:26:08,746 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 21:26:08,746 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 21:26:08,746 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 21:26:08,853 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 21:26:10,496 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 [2022-11-20 21:26:10,496 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 21:26:10,496 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 21:26:10,496 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 57, 57] total 139 [2022-11-20 21:26:10,496 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [447713312] [2022-11-20 21:26:10,496 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 21:26:10,497 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 139 states [2022-11-20 21:26:10,497 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:26:10,498 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 139 interpolants. [2022-11-20 21:26:10,499 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3623, Invalid=18133, Unknown=0, NotChecked=0, Total=21756 [2022-11-20 21:26:10,500 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) [2022-11-20 21:26:12,706 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:26:12,706 INFO L93 Difference]: Finished difference Result 67 states and 68 transitions. [2022-11-20 21:26:12,707 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2022-11-20 21:26:12,707 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 [2022-11-20 21:26:12,707 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:26:12,707 INFO L225 Difference]: With dead ends: 67 [2022-11-20 21:26:12,707 INFO L226 Difference]: Without dead ends: 63 [2022-11-20 21:26:12,709 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 267 GetRequests, 65 SyntacticMatches, 28 SemanticMatches, 174 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16616 ImplicationChecksByTransitivity, 10.7s TimeCoverageRelationStatistics Valid=7083, Invalid=23717, Unknown=0, NotChecked=0, Total=30800 [2022-11-20 21:26:12,709 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 341 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 420 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s 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 [2022-11-20 21:26:12,709 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] [2022-11-20 21:26:12,711 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2022-11-20 21:26:12,809 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2022-11-20 21:26:12,809 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) [2022-11-20 21:26:12,809 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 64 transitions. [2022-11-20 21:26:12,809 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 64 transitions. Word has length 61 [2022-11-20 21:26:12,809 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:26:12,810 INFO L495 AbstractCegarLoop]: Abstraction has 63 states and 64 transitions. [2022-11-20 21:26:12,810 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) [2022-11-20 21:26:12,810 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 64 transitions. [2022-11-20 21:26:12,810 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2022-11-20 21:26:12,810 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:26:12,810 INFO L195 NwaCegarLoop]: trace histogram [26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 21:26:12,815 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Forceful destruction successful, exit code 0 [2022-11-20 21:26:13,011 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable54 [2022-11-20 21:26:13,011 INFO L420 AbstractCegarLoop]: === Iteration 56 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:26:13,011 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:26:13,011 INFO L85 PathProgramCache]: Analyzing trace with hash 550948818, now seen corresponding path program 50 times [2022-11-20 21:26:13,011 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:26:13,011 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1485729378] [2022-11-20 21:26:13,011 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:26:13,012 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:26:13,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:26:17,074 INFO L134 CoverageAnalysis]: Checked inductivity of 702 backedges. 0 proven. 702 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:26:17,075 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:26:17,075 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1485729378] [2022-11-20 21:26:17,075 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1485729378] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 21:26:17,075 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1144169523] [2022-11-20 21:26:17,075 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 21:26:17,075 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:26:17,075 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:26:17,076 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 21:26:17,078 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf9fc22f-ca02-43d8-9d69-b73ec28ccb6b/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Waiting until timeout for monitored process [2022-11-20 21:26:17,152 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2022-11-20 21:26:17,152 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 21:26:17,156 WARN L261 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 141 conjunts are in the unsatisfiable core [2022-11-20 21:26:17,159 INFO L286 TraceCheckSpWp]: Computing forward predicates...