./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loop-new/count_by_nondet.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 2329fc70 Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29fef0b-4089-45a4-af7b-f270708e2ae2/bin/utaipan-gh47qXpMRh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29fef0b-4089-45a4-af7b-f270708e2ae2/bin/utaipan-gh47qXpMRh/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29fef0b-4089-45a4-af7b-f270708e2ae2/bin/utaipan-gh47qXpMRh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29fef0b-4089-45a4-af7b-f270708e2ae2/bin/utaipan-gh47qXpMRh/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-new/count_by_nondet.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29fef0b-4089-45a4-af7b-f270708e2ae2/bin/utaipan-gh47qXpMRh/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29fef0b-4089-45a4-af7b-f270708e2ae2/bin/utaipan-gh47qXpMRh --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 3467a31f3cd19e731a18eaf7789079f202f3b29e437ef24ddd0458f09610424d --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-2329fc7 [2022-12-14 08:47:45,424 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-12-14 08:47:45,426 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-12-14 08:47:45,438 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-12-14 08:47:45,438 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-12-14 08:47:45,439 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-12-14 08:47:45,440 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-12-14 08:47:45,441 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-12-14 08:47:45,442 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-12-14 08:47:45,442 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-12-14 08:47:45,443 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-12-14 08:47:45,444 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-12-14 08:47:45,444 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-12-14 08:47:45,445 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-12-14 08:47:45,445 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-12-14 08:47:45,446 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-12-14 08:47:45,447 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-12-14 08:47:45,447 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-12-14 08:47:45,448 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-12-14 08:47:45,449 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-12-14 08:47:45,450 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-12-14 08:47:45,451 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-12-14 08:47:45,452 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-12-14 08:47:45,453 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-12-14 08:47:45,455 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-12-14 08:47:45,455 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-12-14 08:47:45,455 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-12-14 08:47:45,456 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-12-14 08:47:45,456 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-12-14 08:47:45,457 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-12-14 08:47:45,457 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-12-14 08:47:45,457 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-12-14 08:47:45,458 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-12-14 08:47:45,458 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-12-14 08:47:45,459 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-12-14 08:47:45,459 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-12-14 08:47:45,459 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-12-14 08:47:45,459 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-12-14 08:47:45,459 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-12-14 08:47:45,460 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-12-14 08:47:45,460 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-12-14 08:47:45,461 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29fef0b-4089-45a4-af7b-f270708e2ae2/bin/utaipan-gh47qXpMRh/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-12-14 08:47:45,475 INFO L113 SettingsManager]: Loading preferences was successful [2022-12-14 08:47:45,475 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-12-14 08:47:45,475 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-12-14 08:47:45,475 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-12-14 08:47:45,476 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-12-14 08:47:45,476 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-12-14 08:47:45,476 INFO L138 SettingsManager]: * User list type=DISABLED [2022-12-14 08:47:45,476 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-12-14 08:47:45,476 INFO L138 SettingsManager]: * Explicit value domain=true [2022-12-14 08:47:45,476 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-12-14 08:47:45,477 INFO L138 SettingsManager]: * Octagon Domain=false [2022-12-14 08:47:45,477 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-12-14 08:47:45,477 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-12-14 08:47:45,477 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-12-14 08:47:45,477 INFO L138 SettingsManager]: * Interval Domain=false [2022-12-14 08:47:45,477 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-12-14 08:47:45,477 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-12-14 08:47:45,477 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-12-14 08:47:45,478 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-12-14 08:47:45,478 INFO L138 SettingsManager]: * sizeof long=4 [2022-12-14 08:47:45,478 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-12-14 08:47:45,478 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-12-14 08:47:45,478 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-12-14 08:47:45,478 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-12-14 08:47:45,478 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-12-14 08:47:45,478 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-12-14 08:47:45,479 INFO L138 SettingsManager]: * sizeof long double=12 [2022-12-14 08:47:45,479 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-12-14 08:47:45,479 INFO L138 SettingsManager]: * Use constant arrays=true [2022-12-14 08:47:45,479 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-12-14 08:47:45,479 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-12-14 08:47:45,479 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-12-14 08:47:45,479 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 08:47:45,479 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-12-14 08:47:45,479 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-12-14 08:47:45,479 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-12-14 08:47:45,480 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-12-14 08:47:45,480 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-12-14 08:47:45,480 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-12-14 08:47:45,480 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-12-14 08:47:45,480 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-12-14 08:47:45,480 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_b29fef0b-4089-45a4-af7b-f270708e2ae2/bin/utaipan-gh47qXpMRh/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29fef0b-4089-45a4-af7b-f270708e2ae2/bin/utaipan-gh47qXpMRh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 3467a31f3cd19e731a18eaf7789079f202f3b29e437ef24ddd0458f09610424d [2022-12-14 08:47:45,649 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-12-14 08:47:45,665 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-12-14 08:47:45,667 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-12-14 08:47:45,668 INFO L271 PluginConnector]: Initializing CDTParser... [2022-12-14 08:47:45,668 INFO L275 PluginConnector]: CDTParser initialized [2022-12-14 08:47:45,669 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29fef0b-4089-45a4-af7b-f270708e2ae2/bin/utaipan-gh47qXpMRh/../../sv-benchmarks/c/loop-new/count_by_nondet.i [2022-12-14 08:47:48,220 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-12-14 08:47:48,393 INFO L351 CDTParser]: Found 1 translation units. [2022-12-14 08:47:48,394 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29fef0b-4089-45a4-af7b-f270708e2ae2/sv-benchmarks/c/loop-new/count_by_nondet.i [2022-12-14 08:47:48,399 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29fef0b-4089-45a4-af7b-f270708e2ae2/bin/utaipan-gh47qXpMRh/data/78b82e9c3/237b7f19132f494986c8a8d0e9d3d36c/FLAGf5482d126 [2022-12-14 08:47:48,792 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29fef0b-4089-45a4-af7b-f270708e2ae2/bin/utaipan-gh47qXpMRh/data/78b82e9c3/237b7f19132f494986c8a8d0e9d3d36c [2022-12-14 08:47:48,794 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-12-14 08:47:48,795 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-12-14 08:47:48,796 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-12-14 08:47:48,796 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-12-14 08:47:48,799 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-12-14 08:47:48,799 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 08:47:48" (1/1) ... [2022-12-14 08:47:48,800 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1e799a5a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 08:47:48, skipping insertion in model container [2022-12-14 08:47:48,800 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 08:47:48" (1/1) ... [2022-12-14 08:47:48,806 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-12-14 08:47:48,817 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-12-14 08:47:48,916 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_b29fef0b-4089-45a4-af7b-f270708e2ae2/sv-benchmarks/c/loop-new/count_by_nondet.i[891,904] [2022-12-14 08:47:48,923 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 08:47:48,930 INFO L203 MainTranslator]: Completed pre-run [2022-12-14 08:47:48,939 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_b29fef0b-4089-45a4-af7b-f270708e2ae2/sv-benchmarks/c/loop-new/count_by_nondet.i[891,904] [2022-12-14 08:47:48,940 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 08:47:48,950 INFO L208 MainTranslator]: Completed translation [2022-12-14 08:47:48,950 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 08:47:48 WrapperNode [2022-12-14 08:47:48,950 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-12-14 08:47:48,951 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-12-14 08:47:48,951 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-12-14 08:47:48,951 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-12-14 08:47:48,956 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 08:47:48" (1/1) ... [2022-12-14 08:47:48,961 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 08:47:48" (1/1) ... [2022-12-14 08:47:48,972 INFO L138 Inliner]: procedures = 16, calls = 7, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 34 [2022-12-14 08:47:48,972 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-12-14 08:47:48,972 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-12-14 08:47:48,973 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-12-14 08:47:48,973 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-12-14 08:47:48,979 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 08:47:48" (1/1) ... [2022-12-14 08:47:48,979 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 08:47:48" (1/1) ... [2022-12-14 08:47:48,980 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 08:47:48" (1/1) ... [2022-12-14 08:47:48,980 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 08:47:48" (1/1) ... [2022-12-14 08:47:48,981 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 08:47:48" (1/1) ... [2022-12-14 08:47:48,983 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 08:47:48" (1/1) ... [2022-12-14 08:47:48,984 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 08:47:48" (1/1) ... [2022-12-14 08:47:48,984 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 08:47:48" (1/1) ... [2022-12-14 08:47:48,985 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-12-14 08:47:48,986 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-12-14 08:47:48,986 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-12-14 08:47:48,986 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-12-14 08:47:48,986 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 08:47:48" (1/1) ... [2022-12-14 08:47:48,991 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 08:47:48,998 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29fef0b-4089-45a4-af7b-f270708e2ae2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:47:49,006 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29fef0b-4089-45a4-af7b-f270708e2ae2/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-12-14 08:47:49,008 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29fef0b-4089-45a4-af7b-f270708e2ae2/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-12-14 08:47:49,032 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-12-14 08:47:49,032 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-12-14 08:47:49,032 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-12-14 08:47:49,032 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-12-14 08:47:49,080 INFO L235 CfgBuilder]: Building ICFG [2022-12-14 08:47:49,081 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-12-14 08:47:49,154 INFO L276 CfgBuilder]: Performing block encoding [2022-12-14 08:47:49,168 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-12-14 08:47:49,168 INFO L300 CfgBuilder]: Removed 1 assume(true) statements. [2022-12-14 08:47:49,170 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 08:47:49 BoogieIcfgContainer [2022-12-14 08:47:49,170 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-12-14 08:47:49,172 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-12-14 08:47:49,172 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-12-14 08:47:49,174 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-12-14 08:47:49,174 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.12 08:47:48" (1/3) ... [2022-12-14 08:47:49,175 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@cb429c8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 08:47:49, skipping insertion in model container [2022-12-14 08:47:49,175 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 08:47:48" (2/3) ... [2022-12-14 08:47:49,175 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@cb429c8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 08:47:49, skipping insertion in model container [2022-12-14 08:47:49,175 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 08:47:49" (3/3) ... [2022-12-14 08:47:49,176 INFO L112 eAbstractionObserver]: Analyzing ICFG count_by_nondet.i [2022-12-14 08:47:49,190 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-12-14 08:47:49,190 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-12-14 08:47:49,223 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-12-14 08:47:49,227 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;@6818cc3a, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-12-14 08:47:49,228 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-12-14 08:47:49,230 INFO L276 IsEmpty]: Start isEmpty. Operand has 9 states, 7 states have (on average 1.5714285714285714) internal successors, (11), 8 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:47:49,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2022-12-14 08:47:49,234 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:47:49,235 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2022-12-14 08:47:49,235 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:47:49,239 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:47:49,239 INFO L85 PathProgramCache]: Analyzing trace with hash 2003462, now seen corresponding path program 1 times [2022-12-14 08:47:49,246 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:47:49,247 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [859720473] [2022-12-14 08:47:49,247 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:47:49,247 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:47:49,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:47:49,362 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:47:49,363 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:47:49,363 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [859720473] [2022-12-14 08:47:49,363 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [859720473] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 08:47:49,363 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 08:47:49,364 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-12-14 08:47:49,365 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [218459737] [2022-12-14 08:47:49,365 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 08:47:49,368 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-12-14 08:47:49,368 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:47:49,389 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-12-14 08:47:49,389 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 08:47:49,391 INFO L87 Difference]: Start difference. First operand has 9 states, 7 states have (on average 1.5714285714285714) internal successors, (11), 8 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:47:49,416 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:47:49,416 INFO L93 Difference]: Finished difference Result 19 states and 22 transitions. [2022-12-14 08:47:49,418 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-12-14 08:47:49,419 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 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 4 [2022-12-14 08:47:49,419 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:47:49,424 INFO L225 Difference]: With dead ends: 19 [2022-12-14 08:47:49,424 INFO L226 Difference]: Without dead ends: 8 [2022-12-14 08:47:49,426 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 08:47:49,436 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 3 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 9 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 08:47:49,437 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 10 Invalid, 9 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 08:47:49,449 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2022-12-14 08:47:49,456 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 7. [2022-12-14 08:47:49,461 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 6 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:47:49,462 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 7 transitions. [2022-12-14 08:47:49,462 INFO L78 Accepts]: Start accepts. Automaton has 7 states and 7 transitions. Word has length 4 [2022-12-14 08:47:49,462 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:47:49,463 INFO L495 AbstractCegarLoop]: Abstraction has 7 states and 7 transitions. [2022-12-14 08:47:49,463 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:47:49,463 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states and 7 transitions. [2022-12-14 08:47:49,463 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-12-14 08:47:49,463 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:47:49,463 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-12-14 08:47:49,463 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-12-14 08:47:49,464 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:47:49,464 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:47:49,464 INFO L85 PathProgramCache]: Analyzing trace with hash 1900196609, now seen corresponding path program 1 times [2022-12-14 08:47:49,464 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:47:49,464 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1234488719] [2022-12-14 08:47:49,464 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:47:49,465 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:47:49,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:47:49,516 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:47:49,517 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:47:49,517 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1234488719] [2022-12-14 08:47:49,517 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1234488719] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:47:49,517 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [428629595] [2022-12-14 08:47:49,517 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:47:49,518 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:47:49,518 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29fef0b-4089-45a4-af7b-f270708e2ae2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:47:49,519 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29fef0b-4089-45a4-af7b-f270708e2ae2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:47:49,520 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29fef0b-4089-45a4-af7b-f270708e2ae2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-12-14 08:47:49,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:47:49,558 INFO L263 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 4 conjunts are in the unsatisfiable core [2022-12-14 08:47:49,561 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:47:49,595 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:47:49,596 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:47:49,614 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:47:49,614 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [428629595] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:47:49,614 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [687897789] [2022-12-14 08:47:49,628 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2022-12-14 08:47:49,629 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:47:49,631 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:47:49,635 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:47:49,636 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:47:49,743 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:47:49,817 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '85#(and (<= 1000000 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= |ULTIMATE.start_main_~k~0#1| 1000000) 1 0)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:47:49,817 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:47:49,817 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:47:49,818 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 4 [2022-12-14 08:47:49,818 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [845365647] [2022-12-14 08:47:49,818 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:47:49,819 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-12-14 08:47:49,819 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:47:49,820 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-12-14 08:47:49,820 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2022-12-14 08:47:49,820 INFO L87 Difference]: Start difference. First operand 7 states and 7 transitions. Second operand has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:47:49,834 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:47:49,834 INFO L93 Difference]: Finished difference Result 12 states and 12 transitions. [2022-12-14 08:47:49,834 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-12-14 08:47:49,834 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 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 6 [2022-12-14 08:47:49,835 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:47:49,835 INFO L225 Difference]: With dead ends: 12 [2022-12-14 08:47:49,835 INFO L226 Difference]: Without dead ends: 9 [2022-12-14 08:47:49,835 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 10 SyntacticMatches, 2 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2022-12-14 08:47:49,836 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 1 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 10 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 08:47:49,837 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 6 Invalid, 10 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 08:47:49,837 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2022-12-14 08:47:49,838 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2022-12-14 08:47:49,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9 states, 8 states have (on average 1.125) internal successors, (9), 8 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:47:49,839 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 9 transitions. [2022-12-14 08:47:49,839 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 9 transitions. Word has length 6 [2022-12-14 08:47:49,839 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:47:49,839 INFO L495 AbstractCegarLoop]: Abstraction has 9 states and 9 transitions. [2022-12-14 08:47:49,839 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:47:49,839 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 9 transitions. [2022-12-14 08:47:49,840 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-12-14 08:47:49,840 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:47:49,840 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1] [2022-12-14 08:47:49,846 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29fef0b-4089-45a4-af7b-f270708e2ae2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-12-14 08:47:50,040 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29fef0b-4089-45a4-af7b-f270708e2ae2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2022-12-14 08:47:50,041 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:47:50,041 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:47:50,041 INFO L85 PathProgramCache]: Analyzing trace with hash 702710076, now seen corresponding path program 2 times [2022-12-14 08:47:50,042 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:47:50,042 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1644941590] [2022-12-14 08:47:50,042 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:47:50,042 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:47:50,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:47:50,129 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:47:50,129 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:47:50,130 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1644941590] [2022-12-14 08:47:50,130 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1644941590] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:47:50,130 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [436645996] [2022-12-14 08:47:50,130 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:47:50,130 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:47:50,131 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29fef0b-4089-45a4-af7b-f270708e2ae2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:47:50,131 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29fef0b-4089-45a4-af7b-f270708e2ae2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:47:50,132 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29fef0b-4089-45a4-af7b-f270708e2ae2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-12-14 08:47:50,164 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-12-14 08:47:50,165 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:47:50,165 INFO L263 TraceCheckSpWp]: Trace formula consists of 55 conjuncts, 9 conjunts are in the unsatisfiable core [2022-12-14 08:47:50,166 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:47:50,190 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:47:50,190 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:47:50,220 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:47:50,220 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [436645996] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:47:50,220 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1799897319] [2022-12-14 08:47:50,227 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2022-12-14 08:47:50,227 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:47:50,227 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:47:50,227 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:47:50,228 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:47:50,283 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:47:50,360 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '169#(and (<= 1000000 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= |ULTIMATE.start_main_~k~0#1| 1000000) 1 0)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:47:50,360 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:47:50,360 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:47:50,360 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 10 [2022-12-14 08:47:50,361 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [78783052] [2022-12-14 08:47:50,361 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:47:50,361 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-12-14 08:47:50,361 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:47:50,362 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-12-14 08:47:50,362 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=157, Unknown=0, NotChecked=0, Total=210 [2022-12-14 08:47:50,362 INFO L87 Difference]: Start difference. First operand 9 states and 9 transitions. Second operand has 11 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 10 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:47:50,415 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:47:50,415 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2022-12-14 08:47:50,415 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-12-14 08:47:50,415 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 10 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) Word has length 8 [2022-12-14 08:47:50,416 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:47:50,416 INFO L225 Difference]: With dead ends: 24 [2022-12-14 08:47:50,416 INFO L226 Difference]: Without dead ends: 18 [2022-12-14 08:47:50,416 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=85, Invalid=257, Unknown=0, NotChecked=0, Total=342 [2022-12-14 08:47:50,417 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 8 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 29 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 08:47:50,417 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 18 Invalid, 29 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 08:47:50,418 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2022-12-14 08:47:50,419 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 17. [2022-12-14 08:47:50,420 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 16 states have (on average 1.0625) internal successors, (17), 16 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:47:50,420 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2022-12-14 08:47:50,420 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 8 [2022-12-14 08:47:50,420 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:47:50,420 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2022-12-14 08:47:50,421 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 10 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:47:50,421 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2022-12-14 08:47:50,421 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-12-14 08:47:50,421 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:47:50,421 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1] [2022-12-14 08:47:50,427 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29fef0b-4089-45a4-af7b-f270708e2ae2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2022-12-14 08:47:50,622 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29fef0b-4089-45a4-af7b-f270708e2ae2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:47:50,624 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:47:50,625 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:47:50,625 INFO L85 PathProgramCache]: Analyzing trace with hash -974897496, now seen corresponding path program 3 times [2022-12-14 08:47:50,626 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:47:50,626 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1079627584] [2022-12-14 08:47:50,627 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:47:50,627 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:47:50,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:47:50,864 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:47:50,865 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:47:50,865 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1079627584] [2022-12-14 08:47:50,865 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1079627584] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:47:50,865 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2121985968] [2022-12-14 08:47:50,865 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:47:50,865 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:47:50,865 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29fef0b-4089-45a4-af7b-f270708e2ae2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:47:50,866 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29fef0b-4089-45a4-af7b-f270708e2ae2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:47:50,867 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29fef0b-4089-45a4-af7b-f270708e2ae2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-12-14 08:47:50,899 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:47:50,900 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:47:50,900 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 13 conjunts are in the unsatisfiable core [2022-12-14 08:47:50,902 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:47:50,937 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:47:50,937 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:47:51,028 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:47:51,028 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2121985968] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:47:51,029 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1315769590] [2022-12-14 08:47:51,031 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2022-12-14 08:47:51,031 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:47:51,031 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:47:51,031 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:47:51,032 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:47:51,099 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:47:51,157 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '345#(and (<= 1000000 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= |ULTIMATE.start_main_~k~0#1| 1000000) 1 0)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:47:51,157 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:47:51,158 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:47:51,158 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 18 [2022-12-14 08:47:51,158 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [982320422] [2022-12-14 08:47:51,158 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:47:51,158 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-12-14 08:47:51,159 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:47:51,159 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-12-14 08:47:51,160 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=353, Unknown=0, NotChecked=0, Total=506 [2022-12-14 08:47:51,160 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand has 19 states, 19 states have (on average 1.8421052631578947) internal successors, (35), 18 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:47:51,261 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:47:51,261 INFO L93 Difference]: Finished difference Result 44 states and 51 transitions. [2022-12-14 08:47:51,262 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-12-14 08:47:51,262 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.8421052631578947) internal successors, (35), 18 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) Word has length 16 [2022-12-14 08:47:51,262 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:47:51,263 INFO L225 Difference]: With dead ends: 44 [2022-12-14 08:47:51,263 INFO L226 Difference]: Without dead ends: 34 [2022-12-14 08:47:51,263 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 201 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=249, Invalid=681, Unknown=0, NotChecked=0, Total=930 [2022-12-14 08:47:51,264 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 23 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 08:47:51,264 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [23 Valid, 25 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 08:47:51,265 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2022-12-14 08:47:51,268 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2022-12-14 08:47:51,268 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 32 states have (on average 1.03125) internal successors, (33), 32 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:47:51,269 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2022-12-14 08:47:51,269 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 16 [2022-12-14 08:47:51,269 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:47:51,269 INFO L495 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2022-12-14 08:47:51,269 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.8421052631578947) internal successors, (35), 18 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:47:51,269 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2022-12-14 08:47:51,270 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-12-14 08:47:51,270 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:47:51,270 INFO L195 NwaCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1] [2022-12-14 08:47:51,274 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29fef0b-4089-45a4-af7b-f270708e2ae2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2022-12-14 08:47:51,471 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29fef0b-4089-45a4-af7b-f270708e2ae2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:47:51,472 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:47:51,473 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:47:51,473 INFO L85 PathProgramCache]: Analyzing trace with hash -834062976, now seen corresponding path program 4 times [2022-12-14 08:47:51,474 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:47:51,474 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [208776922] [2022-12-14 08:47:51,474 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:47:51,474 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:47:51,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:47:51,811 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:47:51,811 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:47:51,811 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [208776922] [2022-12-14 08:47:51,811 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [208776922] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:47:51,812 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [932721100] [2022-12-14 08:47:51,812 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:47:51,812 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:47:51,812 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29fef0b-4089-45a4-af7b-f270708e2ae2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:47:51,813 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29fef0b-4089-45a4-af7b-f270708e2ae2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:47:51,814 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29fef0b-4089-45a4-af7b-f270708e2ae2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-12-14 08:47:51,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:47:51,863 INFO L263 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 21 conjunts are in the unsatisfiable core [2022-12-14 08:47:51,865 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:47:51,924 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:47:51,924 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:47:52,216 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:47:52,216 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [932721100] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:47:52,216 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [197121186] [2022-12-14 08:47:52,217 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2022-12-14 08:47:52,217 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:47:52,218 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:47:52,218 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:47:52,218 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:47:52,255 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:47:52,347 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '693#(and (<= 1000000 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= |ULTIMATE.start_main_~k~0#1| 1000000) 1 0)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:47:52,347 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:47:52,348 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:47:52,348 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 34 [2022-12-14 08:47:52,348 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [965286817] [2022-12-14 08:47:52,348 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:47:52,349 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-12-14 08:47:52,349 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:47:52,350 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-12-14 08:47:52,351 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=545, Invalid=937, Unknown=0, NotChecked=0, Total=1482 [2022-12-14 08:47:52,351 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand has 35 states, 35 states have (on average 1.9142857142857144) internal successors, (67), 34 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:47:52,590 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:47:52,590 INFO L93 Difference]: Finished difference Result 84 states and 99 transitions. [2022-12-14 08:47:52,591 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2022-12-14 08:47:52,591 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.9142857142857144) internal successors, (67), 34 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 32 [2022-12-14 08:47:52,591 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:47:52,591 INFO L225 Difference]: With dead ends: 84 [2022-12-14 08:47:52,592 INFO L226 Difference]: Without dead ends: 66 [2022-12-14 08:47:52,592 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 74 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 545 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=865, Invalid=2105, Unknown=0, NotChecked=0, Total=2970 [2022-12-14 08:47:52,593 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 46 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 55 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 71 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 55 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 08:47:52,593 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [46 Valid, 43 Invalid, 71 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 55 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 08:47:52,593 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2022-12-14 08:47:52,597 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2022-12-14 08:47:52,597 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 64 states have (on average 1.015625) internal successors, (65), 64 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:47:52,598 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 65 transitions. [2022-12-14 08:47:52,598 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 65 transitions. Word has length 32 [2022-12-14 08:47:52,598 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:47:52,598 INFO L495 AbstractCegarLoop]: Abstraction has 65 states and 65 transitions. [2022-12-14 08:47:52,598 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.9142857142857144) internal successors, (67), 34 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:47:52,598 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 65 transitions. [2022-12-14 08:47:52,599 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-12-14 08:47:52,599 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:47:52,599 INFO L195 NwaCegarLoop]: trace histogram [30, 30, 1, 1, 1, 1] [2022-12-14 08:47:52,604 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29fef0b-4089-45a4-af7b-f270708e2ae2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2022-12-14 08:47:52,800 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29fef0b-4089-45a4-af7b-f270708e2ae2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:47:52,801 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:47:52,802 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:47:52,802 INFO L85 PathProgramCache]: Analyzing trace with hash -831974608, now seen corresponding path program 5 times [2022-12-14 08:47:52,803 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:47:52,803 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1777348236] [2022-12-14 08:47:52,803 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:47:52,804 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:47:52,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:47:53,615 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:47:53,615 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:47:53,615 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1777348236] [2022-12-14 08:47:53,615 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1777348236] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:47:53,615 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1927092063] [2022-12-14 08:47:53,615 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:47:53,615 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:47:53,615 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29fef0b-4089-45a4-af7b-f270708e2ae2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:47:53,616 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29fef0b-4089-45a4-af7b-f270708e2ae2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:47:53,617 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29fef0b-4089-45a4-af7b-f270708e2ae2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-12-14 08:47:53,697 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 31 check-sat command(s) [2022-12-14 08:47:53,697 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:47:53,700 INFO L263 TraceCheckSpWp]: Trace formula consists of 363 conjuncts, 37 conjunts are in the unsatisfiable core [2022-12-14 08:47:53,703 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:47:53,793 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:47:53,793 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:47:54,689 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:47:54,690 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1927092063] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:47:54,690 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [707579481] [2022-12-14 08:47:54,691 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2022-12-14 08:47:54,691 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:47:54,692 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:47:54,692 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:47:54,692 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:47:54,724 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:47:54,841 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1385#(and (<= 1000000 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= |ULTIMATE.start_main_~k~0#1| 1000000) 1 0)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:47:54,841 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:47:54,841 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:47:54,841 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 66 [2022-12-14 08:47:54,841 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [413287873] [2022-12-14 08:47:54,841 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:47:54,842 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 67 states [2022-12-14 08:47:54,842 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:47:54,845 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2022-12-14 08:47:54,847 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2097, Invalid=2873, Unknown=0, NotChecked=0, Total=4970 [2022-12-14 08:47:54,848 INFO L87 Difference]: Start difference. First operand 65 states and 65 transitions. Second operand has 67 states, 67 states have (on average 1.955223880597015) internal successors, (131), 66 states have internal predecessors, (131), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:47:55,580 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:47:55,580 INFO L93 Difference]: Finished difference Result 164 states and 195 transitions. [2022-12-14 08:47:55,580 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2022-12-14 08:47:55,581 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 67 states have (on average 1.955223880597015) internal successors, (131), 66 states have internal predecessors, (131), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 64 [2022-12-14 08:47:55,581 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:47:55,582 INFO L225 Difference]: With dead ends: 164 [2022-12-14 08:47:55,582 INFO L226 Difference]: Without dead ends: 130 [2022-12-14 08:47:55,585 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 255 GetRequests, 154 SyntacticMatches, 0 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1617 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=3249, Invalid=7257, Unknown=0, NotChecked=0, Total=10506 [2022-12-14 08:47:55,585 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 84 mSDsluCounter, 78 mSDsCounter, 0 mSdLazyCounter, 108 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 84 SdHoareTripleChecker+Valid, 81 SdHoareTripleChecker+Invalid, 140 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 108 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:47:55,585 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [84 Valid, 81 Invalid, 140 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 108 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:47:55,586 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2022-12-14 08:47:55,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 129. [2022-12-14 08:47:55,595 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 129 states, 128 states have (on average 1.0078125) internal successors, (129), 128 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:47:55,596 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 129 transitions. [2022-12-14 08:47:55,596 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 129 transitions. Word has length 64 [2022-12-14 08:47:55,596 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:47:55,596 INFO L495 AbstractCegarLoop]: Abstraction has 129 states and 129 transitions. [2022-12-14 08:47:55,597 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 67 states, 67 states have (on average 1.955223880597015) internal successors, (131), 66 states have internal predecessors, (131), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:47:55,597 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 129 transitions. [2022-12-14 08:47:55,599 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2022-12-14 08:47:55,599 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:47:55,599 INFO L195 NwaCegarLoop]: trace histogram [62, 62, 1, 1, 1, 1] [2022-12-14 08:47:55,603 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29fef0b-4089-45a4-af7b-f270708e2ae2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2022-12-14 08:47:55,799 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29fef0b-4089-45a4-af7b-f270708e2ae2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2022-12-14 08:47:55,800 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:47:55,800 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:47:55,800 INFO L85 PathProgramCache]: Analyzing trace with hash -1702850928, now seen corresponding path program 6 times [2022-12-14 08:47:55,800 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:47:55,800 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1328193032] [2022-12-14 08:47:55,800 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:47:55,800 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:47:55,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:47:57,614 INFO L134 CoverageAnalysis]: Checked inductivity of 3844 backedges. 0 proven. 3844 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:47:57,614 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:47:57,614 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1328193032] [2022-12-14 08:47:57,614 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1328193032] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:47:57,614 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [566848688] [2022-12-14 08:47:57,614 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:47:57,614 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:47:57,614 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29fef0b-4089-45a4-af7b-f270708e2ae2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:47:57,615 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29fef0b-4089-45a4-af7b-f270708e2ae2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:47:57,616 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29fef0b-4089-45a4-af7b-f270708e2ae2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-12-14 08:47:57,710 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:47:57,710 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:47:57,713 INFO L263 TraceCheckSpWp]: Trace formula consists of 715 conjuncts, 69 conjunts are in the unsatisfiable core [2022-12-14 08:47:57,716 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:47:57,850 INFO L134 CoverageAnalysis]: Checked inductivity of 3844 backedges. 0 proven. 3844 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:47:57,850 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:48:00,418 INFO L134 CoverageAnalysis]: Checked inductivity of 3844 backedges. 0 proven. 3844 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:48:00,419 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [566848688] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:48:00,419 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1338549146] [2022-12-14 08:48:00,420 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2022-12-14 08:48:00,420 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:48:00,421 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:48:00,421 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:48:00,421 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:48:00,450 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:48:00,579 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2765#(and (<= 1000000 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= |ULTIMATE.start_main_~k~0#1| 1000000) 1 0)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:48:00,579 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:48:00,579 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:48:00,579 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 65, 65] total 130 [2022-12-14 08:48:00,580 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2032043806] [2022-12-14 08:48:00,580 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:48:00,581 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 131 states [2022-12-14 08:48:00,581 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:48:00,585 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 131 interpolants. [2022-12-14 08:48:00,592 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8273, Invalid=9817, Unknown=0, NotChecked=0, Total=18090 [2022-12-14 08:48:00,592 INFO L87 Difference]: Start difference. First operand 129 states and 129 transitions. Second operand has 131 states, 131 states have (on average 1.9770992366412214) internal successors, (259), 130 states have internal predecessors, (259), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:48:02,663 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:48:02,663 INFO L93 Difference]: Finished difference Result 324 states and 387 transitions. [2022-12-14 08:48:02,664 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 192 states. [2022-12-14 08:48:02,664 INFO L78 Accepts]: Start accepts. Automaton has has 131 states, 131 states have (on average 1.9770992366412214) internal successors, (259), 130 states have internal predecessors, (259), 0 states have call successors, (0), 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 128 [2022-12-14 08:48:02,664 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:48:02,665 INFO L225 Difference]: With dead ends: 324 [2022-12-14 08:48:02,665 INFO L226 Difference]: Without dead ends: 258 [2022-12-14 08:48:02,669 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 511 GetRequests, 314 SyntacticMatches, 0 SemanticMatches, 197 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5297 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=12625, Invalid=26777, Unknown=0, NotChecked=0, Total=39402 [2022-12-14 08:48:02,670 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 219 mSDsluCounter, 147 mSDsCounter, 0 mSdLazyCounter, 206 mSolverCounterSat, 64 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 219 SdHoareTripleChecker+Valid, 150 SdHoareTripleChecker+Invalid, 270 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 64 IncrementalHoareTripleChecker+Valid, 206 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:48:02,670 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [219 Valid, 150 Invalid, 270 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [64 Valid, 206 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:48:02,670 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 258 states. [2022-12-14 08:48:02,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 258 to 257. [2022-12-14 08:48:02,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 257 states, 256 states have (on average 1.00390625) internal successors, (257), 256 states have internal predecessors, (257), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:48:02,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 257 states to 257 states and 257 transitions. [2022-12-14 08:48:02,685 INFO L78 Accepts]: Start accepts. Automaton has 257 states and 257 transitions. Word has length 128 [2022-12-14 08:48:02,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:48:02,685 INFO L495 AbstractCegarLoop]: Abstraction has 257 states and 257 transitions. [2022-12-14 08:48:02,685 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 131 states, 131 states have (on average 1.9770992366412214) internal successors, (259), 130 states have internal predecessors, (259), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:48:02,685 INFO L276 IsEmpty]: Start isEmpty. Operand 257 states and 257 transitions. [2022-12-14 08:48:02,689 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 257 [2022-12-14 08:48:02,689 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:48:02,690 INFO L195 NwaCegarLoop]: trace histogram [126, 126, 1, 1, 1, 1] [2022-12-14 08:48:02,694 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29fef0b-4089-45a4-af7b-f270708e2ae2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2022-12-14 08:48:02,890 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29fef0b-4089-45a4-af7b-f270708e2ae2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:48:02,891 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:48:02,892 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:48:02,893 INFO L85 PathProgramCache]: Analyzing trace with hash -703691440, now seen corresponding path program 7 times [2022-12-14 08:48:02,893 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:48:02,893 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [930340452] [2022-12-14 08:48:02,893 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:48:02,894 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:48:03,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:48:09,581 INFO L134 CoverageAnalysis]: Checked inductivity of 15876 backedges. 0 proven. 15876 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:48:09,581 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:48:09,581 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [930340452] [2022-12-14 08:48:09,581 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [930340452] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:48:09,581 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1432418912] [2022-12-14 08:48:09,581 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:48:09,582 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:48:09,582 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29fef0b-4089-45a4-af7b-f270708e2ae2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:48:09,582 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29fef0b-4089-45a4-af7b-f270708e2ae2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:48:09,583 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29fef0b-4089-45a4-af7b-f270708e2ae2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-12-14 08:48:09,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:48:09,725 INFO L263 TraceCheckSpWp]: Trace formula consists of 1419 conjuncts, 133 conjunts are in the unsatisfiable core [2022-12-14 08:48:09,730 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:48:10,034 INFO L134 CoverageAnalysis]: Checked inductivity of 15876 backedges. 0 proven. 15876 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:48:10,035 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:48:22,210 INFO L134 CoverageAnalysis]: Checked inductivity of 15876 backedges. 0 proven. 15876 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:48:22,210 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1432418912] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:48:22,210 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [85889118] [2022-12-14 08:48:22,211 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2022-12-14 08:48:22,212 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:48:22,212 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:48:22,212 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:48:22,212 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:48:22,237 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:48:22,512 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5521#(and (<= 1000000 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= |ULTIMATE.start_main_~k~0#1| 1000000) 1 0)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:48:22,512 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:48:22,512 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:48:22,512 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [129, 129, 129] total 258 [2022-12-14 08:48:22,512 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [360001542] [2022-12-14 08:48:22,512 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:48:22,513 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 259 states [2022-12-14 08:48:22,513 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:48:22,518 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 259 interpolants. [2022-12-14 08:48:22,522 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32913, Invalid=35993, Unknown=0, NotChecked=0, Total=68906 [2022-12-14 08:48:22,523 INFO L87 Difference]: Start difference. First operand 257 states and 257 transitions. Second operand has 259 states, 259 states have (on average 1.9884169884169884) internal successors, (515), 258 states have internal predecessors, (515), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:48:31,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:48:31,105 INFO L93 Difference]: Finished difference Result 644 states and 771 transitions. [2022-12-14 08:48:31,105 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 384 states. [2022-12-14 08:48:31,106 INFO L78 Accepts]: Start accepts. Automaton has has 259 states, 259 states have (on average 1.9884169884169884) internal successors, (515), 258 states have internal predecessors, (515), 0 states have call successors, (0), 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 256 [2022-12-14 08:48:31,107 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:48:31,110 INFO L225 Difference]: With dead ends: 644 [2022-12-14 08:48:31,110 INFO L226 Difference]: Without dead ends: 514 [2022-12-14 08:48:31,117 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1023 GetRequests, 634 SyntacticMatches, 0 SemanticMatches, 389 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18801 ImplicationChecksByTransitivity, 22.9s TimeCoverageRelationStatistics Valid=49809, Invalid=102681, Unknown=0, NotChecked=0, Total=152490 [2022-12-14 08:48:31,117 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 721 mSDsluCounter, 263 mSDsCounter, 0 mSdLazyCounter, 397 mSolverCounterSat, 128 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 721 SdHoareTripleChecker+Valid, 266 SdHoareTripleChecker+Invalid, 525 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 128 IncrementalHoareTripleChecker+Valid, 397 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 08:48:31,118 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [721 Valid, 266 Invalid, 525 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [128 Valid, 397 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 08:48:31,118 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 514 states. [2022-12-14 08:48:31,129 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 514 to 513. [2022-12-14 08:48:31,129 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 513 states, 512 states have (on average 1.001953125) internal successors, (513), 512 states have internal predecessors, (513), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:48:31,130 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 513 states to 513 states and 513 transitions. [2022-12-14 08:48:31,130 INFO L78 Accepts]: Start accepts. Automaton has 513 states and 513 transitions. Word has length 256 [2022-12-14 08:48:31,131 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:48:31,131 INFO L495 AbstractCegarLoop]: Abstraction has 513 states and 513 transitions. [2022-12-14 08:48:31,131 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 259 states, 259 states have (on average 1.9884169884169884) internal successors, (515), 258 states have internal predecessors, (515), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:48:31,131 INFO L276 IsEmpty]: Start isEmpty. Operand 513 states and 513 transitions. [2022-12-14 08:48:31,138 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 513 [2022-12-14 08:48:31,138 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:48:31,138 INFO L195 NwaCegarLoop]: trace histogram [254, 254, 1, 1, 1, 1] [2022-12-14 08:48:31,144 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29fef0b-4089-45a4-af7b-f270708e2ae2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-12-14 08:48:31,339 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29fef0b-4089-45a4-af7b-f270708e2ae2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2022-12-14 08:48:31,340 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:48:31,341 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:48:31,341 INFO L85 PathProgramCache]: Analyzing trace with hash 2057728720, now seen corresponding path program 8 times [2022-12-14 08:48:31,341 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:48:31,342 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [528846402] [2022-12-14 08:48:31,342 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:48:31,342 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:48:32,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:49:00,382 INFO L134 CoverageAnalysis]: Checked inductivity of 64516 backedges. 0 proven. 64516 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:00,382 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:49:00,382 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [528846402] [2022-12-14 08:49:00,382 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [528846402] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:49:00,383 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [187375254] [2022-12-14 08:49:00,383 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:49:00,383 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:49:00,383 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29fef0b-4089-45a4-af7b-f270708e2ae2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:49:00,384 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29fef0b-4089-45a4-af7b-f270708e2ae2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:49:00,384 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29fef0b-4089-45a4-af7b-f270708e2ae2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-12-14 08:49:01,687 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 255 check-sat command(s) [2022-12-14 08:49:01,688 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:49:01,705 INFO L263 TraceCheckSpWp]: Trace formula consists of 2827 conjuncts, 261 conjunts are in the unsatisfiable core [2022-12-14 08:49:01,714 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:49:02,206 INFO L134 CoverageAnalysis]: Checked inductivity of 64516 backedges. 0 proven. 64516 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:02,206 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:49:50,132 INFO L134 CoverageAnalysis]: Checked inductivity of 64516 backedges. 0 proven. 64516 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:50,132 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [187375254] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:49:50,132 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [132828350] [2022-12-14 08:49:50,133 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2022-12-14 08:49:50,134 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:49:50,134 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:49:50,134 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:49:50,134 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:49:50,171 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:49:50,658 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11029#(and (<= 1000000 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= |ULTIMATE.start_main_~k~0#1| 1000000) 1 0)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:49:50,658 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:49:50,658 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:49:50,658 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [257, 257, 257] total 514 [2022-12-14 08:49:50,658 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [504078074] [2022-12-14 08:49:50,659 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:49:50,661 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 515 states [2022-12-14 08:49:50,661 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:49:50,685 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 515 interpolants. [2022-12-14 08:49:50,695 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=131345, Invalid=137497, Unknown=0, NotChecked=0, Total=268842 [2022-12-14 08:49:50,697 INFO L87 Difference]: Start difference. First operand 513 states and 513 transitions. Second operand has 515 states, 515 states have (on average 1.9941747572815534) internal successors, (1027), 514 states have internal predecessors, (1027), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:50:38,813 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:50:38,813 INFO L93 Difference]: Finished difference Result 1284 states and 1539 transitions. [2022-12-14 08:50:38,813 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 768 states. [2022-12-14 08:50:38,814 INFO L78 Accepts]: Start accepts. Automaton has has 515 states, 515 states have (on average 1.9941747572815534) internal successors, (1027), 514 states have internal predecessors, (1027), 0 states have call successors, (0), 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 512 [2022-12-14 08:50:38,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:50:38,816 INFO L225 Difference]: With dead ends: 1284 [2022-12-14 08:50:38,816 INFO L226 Difference]: Without dead ends: 1026 [2022-12-14 08:50:38,848 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2047 GetRequests, 1274 SyntacticMatches, 0 SemanticMatches, 773 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70385 ImplicationChecksByTransitivity, 92.6s TimeCoverageRelationStatistics Valid=197905, Invalid=401945, Unknown=0, NotChecked=0, Total=599850 [2022-12-14 08:50:38,849 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 1322 mSDsluCounter, 530 mSDsCounter, 0 mSdLazyCounter, 785 mSolverCounterSat, 256 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1322 SdHoareTripleChecker+Valid, 533 SdHoareTripleChecker+Invalid, 1041 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 256 IncrementalHoareTripleChecker+Valid, 785 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-12-14 08:50:38,849 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1322 Valid, 533 Invalid, 1041 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [256 Valid, 785 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-12-14 08:50:38,850 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1026 states. [2022-12-14 08:50:38,864 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1026 to 1025. [2022-12-14 08:50:38,865 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1025 states, 1024 states have (on average 1.0009765625) internal successors, (1025), 1024 states have internal predecessors, (1025), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:50:38,867 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1025 states to 1025 states and 1025 transitions. [2022-12-14 08:50:38,867 INFO L78 Accepts]: Start accepts. Automaton has 1025 states and 1025 transitions. Word has length 512 [2022-12-14 08:50:38,867 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:50:38,867 INFO L495 AbstractCegarLoop]: Abstraction has 1025 states and 1025 transitions. [2022-12-14 08:50:38,868 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 515 states, 515 states have (on average 1.9941747572815534) internal successors, (1027), 514 states have internal predecessors, (1027), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:50:38,868 INFO L276 IsEmpty]: Start isEmpty. Operand 1025 states and 1025 transitions. [2022-12-14 08:50:38,889 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1025 [2022-12-14 08:50:38,890 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:50:38,890 INFO L195 NwaCegarLoop]: trace histogram [510, 510, 1, 1, 1, 1] [2022-12-14 08:50:38,897 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29fef0b-4089-45a4-af7b-f270708e2ae2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-12-14 08:50:39,090 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29fef0b-4089-45a4-af7b-f270708e2ae2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:50:39,092 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:50:39,092 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:50:39,093 INFO L85 PathProgramCache]: Analyzing trace with hash 2043039184, now seen corresponding path program 9 times [2022-12-14 08:50:39,093 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:50:39,094 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [18037153] [2022-12-14 08:50:39,094 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:50:39,094 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:50:42,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:53:10,107 INFO L134 CoverageAnalysis]: Checked inductivity of 260100 backedges. 0 proven. 260100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:53:10,108 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:53:10,108 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [18037153] [2022-12-14 08:53:10,108 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [18037153] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:53:10,108 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1306406156] [2022-12-14 08:53:10,108 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:53:10,108 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:53:10,108 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29fef0b-4089-45a4-af7b-f270708e2ae2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:53:10,109 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29fef0b-4089-45a4-af7b-f270708e2ae2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:53:10,110 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29fef0b-4089-45a4-af7b-f270708e2ae2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-12-14 08:53:10,639 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:53:10,639 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:53:10,671 INFO L263 TraceCheckSpWp]: Trace formula consists of 5643 conjuncts, 517 conjunts are in the unsatisfiable core [2022-12-14 08:53:10,688 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:53:11,666 INFO L134 CoverageAnalysis]: Checked inductivity of 260100 backedges. 0 proven. 260100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:53:11,666 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:56:25,425 INFO L134 CoverageAnalysis]: Checked inductivity of 260100 backedges. 0 proven. 260100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:56:25,426 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1306406156] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:56:25,426 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1482398778] [2022-12-14 08:56:25,427 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2022-12-14 08:56:25,427 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:56:25,427 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:56:25,427 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:56:25,427 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:56:25,453 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:56:26,497 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '22041#(and (<= 1000000 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= |ULTIMATE.start_main_~k~0#1| 1000000) 1 0)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:56:26,497 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:56:26,497 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:56:26,497 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [513, 513, 513] total 1026 [2022-12-14 08:56:26,498 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [88619940] [2022-12-14 08:56:26,498 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:56:26,499 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 1027 states [2022-12-14 08:56:26,499 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:56:26,568 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 1027 interpolants. [2022-12-14 08:56:26,612 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=524817, Invalid=537113, Unknown=0, NotChecked=0, Total=1061930 [2022-12-14 08:56:26,614 INFO L87 Difference]: Start difference. First operand 1025 states and 1025 transitions. Second operand has 1027 states, 1027 states have (on average 1.997078870496592) internal successors, (2051), 1026 states have internal predecessors, (2051), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)