./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loop-new/count_by_k.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 8393723b Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c9291b9-85f5-47ae-bc9c-de975cbc7bab/bin/utaipan-I9t0OCRTmS/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c9291b9-85f5-47ae-bc9c-de975cbc7bab/bin/utaipan-I9t0OCRTmS/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c9291b9-85f5-47ae-bc9c-de975cbc7bab/bin/utaipan-I9t0OCRTmS/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c9291b9-85f5-47ae-bc9c-de975cbc7bab/bin/utaipan-I9t0OCRTmS/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-new/count_by_k.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c9291b9-85f5-47ae-bc9c-de975cbc7bab/bin/utaipan-I9t0OCRTmS/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c9291b9-85f5-47ae-bc9c-de975cbc7bab/bin/utaipan-I9t0OCRTmS --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash ee41851a84d57c0c483c2a5edf48180b7c141c1991cdc82f0d66c6775eb49f5b --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-8393723 [2022-11-19 06:52:04,354 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-19 06:52:04,358 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-19 06:52:04,383 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-19 06:52:04,384 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-19 06:52:04,385 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-19 06:52:04,386 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-19 06:52:04,388 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-19 06:52:04,389 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-19 06:52:04,390 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-19 06:52:04,391 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-19 06:52:04,393 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-19 06:52:04,393 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-19 06:52:04,394 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-19 06:52:04,395 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-19 06:52:04,396 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-19 06:52:04,397 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-19 06:52:04,398 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-19 06:52:04,400 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-19 06:52:04,402 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-19 06:52:04,403 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-19 06:52:04,408 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-19 06:52:04,410 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-19 06:52:04,412 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-19 06:52:04,416 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-19 06:52:04,423 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-19 06:52:04,423 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-19 06:52:04,424 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-19 06:52:04,425 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-19 06:52:04,427 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-19 06:52:04,428 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-19 06:52:04,428 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-19 06:52:04,430 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-19 06:52:04,431 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-19 06:52:04,433 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-19 06:52:04,433 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-19 06:52:04,435 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-19 06:52:04,435 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-19 06:52:04,435 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-19 06:52:04,436 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-19 06:52:04,437 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-19 06:52:04,438 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c9291b9-85f5-47ae-bc9c-de975cbc7bab/bin/utaipan-I9t0OCRTmS/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-19 06:52:04,477 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-19 06:52:04,479 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-19 06:52:04,480 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-19 06:52:04,480 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-19 06:52:04,481 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-19 06:52:04,481 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-19 06:52:04,481 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-19 06:52:04,482 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-19 06:52:04,482 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-19 06:52:04,482 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-19 06:52:04,483 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-19 06:52:04,483 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-19 06:52:04,484 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-19 06:52:04,484 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-19 06:52:04,484 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-19 06:52:04,484 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-19 06:52:04,485 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-19 06:52:04,485 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-19 06:52:04,485 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-19 06:52:04,486 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-19 06:52:04,486 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-19 06:52:04,486 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-19 06:52:04,486 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-19 06:52:04,487 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-19 06:52:04,487 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-19 06:52:04,487 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-19 06:52:04,487 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-19 06:52:04,487 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-19 06:52:04,488 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-19 06:52:04,488 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-19 06:52:04,488 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-19 06:52:04,489 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-19 06:52:04,489 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-19 06:52:04,489 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-19 06:52:04,489 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-19 06:52:04,489 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-19 06:52:04,490 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-19 06:52:04,490 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-19 06:52:04,490 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-19 06:52:04,490 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-19 06:52:04,491 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-19 06:52:04,491 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_3c9291b9-85f5-47ae-bc9c-de975cbc7bab/bin/utaipan-I9t0OCRTmS/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c9291b9-85f5-47ae-bc9c-de975cbc7bab/bin/utaipan-I9t0OCRTmS Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> ee41851a84d57c0c483c2a5edf48180b7c141c1991cdc82f0d66c6775eb49f5b [2022-11-19 06:52:04,748 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-19 06:52:04,784 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-19 06:52:04,787 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-19 06:52:04,788 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-19 06:52:04,790 INFO L275 PluginConnector]: CDTParser initialized [2022-11-19 06:52:04,791 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c9291b9-85f5-47ae-bc9c-de975cbc7bab/bin/utaipan-I9t0OCRTmS/../../sv-benchmarks/c/loop-new/count_by_k.i [2022-11-19 06:52:04,888 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c9291b9-85f5-47ae-bc9c-de975cbc7bab/bin/utaipan-I9t0OCRTmS/data/37c061f65/c6cb41dd9c9940c0bdee5345df118ceb/FLAGcff890596 [2022-11-19 06:52:05,295 INFO L306 CDTParser]: Found 1 translation units. [2022-11-19 06:52:05,296 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c9291b9-85f5-47ae-bc9c-de975cbc7bab/sv-benchmarks/c/loop-new/count_by_k.i [2022-11-19 06:52:05,302 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c9291b9-85f5-47ae-bc9c-de975cbc7bab/bin/utaipan-I9t0OCRTmS/data/37c061f65/c6cb41dd9c9940c0bdee5345df118ceb/FLAGcff890596 [2022-11-19 06:52:05,716 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c9291b9-85f5-47ae-bc9c-de975cbc7bab/bin/utaipan-I9t0OCRTmS/data/37c061f65/c6cb41dd9c9940c0bdee5345df118ceb [2022-11-19 06:52:05,718 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-19 06:52:05,719 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-19 06:52:05,721 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-19 06:52:05,721 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-19 06:52:05,725 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-19 06:52:05,726 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 06:52:05" (1/1) ... [2022-11-19 06:52:05,727 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@11493993 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:52:05, skipping insertion in model container [2022-11-19 06:52:05,727 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 06:52:05" (1/1) ... [2022-11-19 06:52:05,734 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-19 06:52:05,747 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-19 06:52:05,955 WARN L234 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c9291b9-85f5-47ae-bc9c-de975cbc7bab/sv-benchmarks/c/loop-new/count_by_k.i[891,904] [2022-11-19 06:52:05,967 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-19 06:52:05,975 INFO L203 MainTranslator]: Completed pre-run [2022-11-19 06:52:05,987 WARN L234 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c9291b9-85f5-47ae-bc9c-de975cbc7bab/sv-benchmarks/c/loop-new/count_by_k.i[891,904] [2022-11-19 06:52:05,990 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-19 06:52:06,003 INFO L208 MainTranslator]: Completed translation [2022-11-19 06:52:06,003 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:52:06 WrapperNode [2022-11-19 06:52:06,004 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-19 06:52:06,005 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-19 06:52:06,005 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-19 06:52:06,006 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-19 06:52:06,013 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:52:06" (1/1) ... [2022-11-19 06:52:06,020 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:52:06" (1/1) ... [2022-11-19 06:52:06,036 INFO L138 Inliner]: procedures = 16, calls = 7, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 32 [2022-11-19 06:52:06,036 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-19 06:52:06,037 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-19 06:52:06,037 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-19 06:52:06,037 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-19 06:52:06,045 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:52:06" (1/1) ... [2022-11-19 06:52:06,046 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:52:06" (1/1) ... [2022-11-19 06:52:06,047 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:52:06" (1/1) ... [2022-11-19 06:52:06,047 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:52:06" (1/1) ... [2022-11-19 06:52:06,049 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:52:06" (1/1) ... [2022-11-19 06:52:06,053 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:52:06" (1/1) ... [2022-11-19 06:52:06,054 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:52:06" (1/1) ... [2022-11-19 06:52:06,054 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:52:06" (1/1) ... [2022-11-19 06:52:06,056 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-19 06:52:06,057 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-19 06:52:06,057 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-19 06:52:06,057 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-19 06:52:06,058 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:52:06" (1/1) ... [2022-11-19 06:52:06,065 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-19 06:52:06,075 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c9291b9-85f5-47ae-bc9c-de975cbc7bab/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:52:06,088 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c9291b9-85f5-47ae-bc9c-de975cbc7bab/bin/utaipan-I9t0OCRTmS/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-19 06:52:06,101 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c9291b9-85f5-47ae-bc9c-de975cbc7bab/bin/utaipan-I9t0OCRTmS/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-19 06:52:06,143 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-19 06:52:06,143 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-19 06:52:06,143 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-19 06:52:06,143 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-19 06:52:06,217 INFO L235 CfgBuilder]: Building ICFG [2022-11-19 06:52:06,219 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-19 06:52:06,362 INFO L276 CfgBuilder]: Performing block encoding [2022-11-19 06:52:06,382 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-19 06:52:06,382 INFO L300 CfgBuilder]: Removed 1 assume(true) statements. [2022-11-19 06:52:06,385 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 06:52:06 BoogieIcfgContainer [2022-11-19 06:52:06,385 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-19 06:52:06,387 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-19 06:52:06,387 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-19 06:52:06,391 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-19 06:52:06,391 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 06:52:05" (1/3) ... [2022-11-19 06:52:06,392 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@27b9603d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 06:52:06, skipping insertion in model container [2022-11-19 06:52:06,392 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:52:06" (2/3) ... [2022-11-19 06:52:06,393 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@27b9603d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 06:52:06, skipping insertion in model container [2022-11-19 06:52:06,393 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 06:52:06" (3/3) ... [2022-11-19 06:52:06,394 INFO L112 eAbstractionObserver]: Analyzing ICFG count_by_k.i [2022-11-19 06:52:06,413 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-19 06:52:06,414 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-19 06:52:06,461 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-19 06:52:06,468 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;@bad8ae3, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-19 06:52:06,468 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-19 06:52:06,472 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) [2022-11-19 06:52:06,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2022-11-19 06:52:06,479 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:52:06,479 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2022-11-19 06:52:06,480 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:52:06,485 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:52:06,485 INFO L85 PathProgramCache]: Analyzing trace with hash 62123654, now seen corresponding path program 1 times [2022-11-19 06:52:06,495 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:52:06,496 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1750847710] [2022-11-19 06:52:06,496 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:52:06,499 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:52:06,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:52:06,822 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 06:52:06,822 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:52:06,823 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1750847710] [2022-11-19 06:52:06,824 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1750847710] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 06:52:06,824 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 06:52:06,824 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-19 06:52:06,826 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1167426672] [2022-11-19 06:52:06,827 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 06:52:06,832 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-19 06:52:06,832 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:52:06,861 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-19 06:52:06,862 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-19 06:52:06,864 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 4 states, 4 states have (on average 1.25) internal successors, (5), 4 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:52:06,937 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:52:06,937 INFO L93 Difference]: Finished difference Result 21 states and 22 transitions. [2022-11-19 06:52:06,938 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-19 06:52:06,940 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.25) internal successors, (5), 4 states have internal predecessors, (5), 0 states have call successors, (0), 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 5 [2022-11-19 06:52:06,940 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:52:06,948 INFO L225 Difference]: With dead ends: 21 [2022-11-19 06:52:06,948 INFO L226 Difference]: Without dead ends: 7 [2022-11-19 06:52:06,951 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-11-19 06:52:06,955 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 9 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 18 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-19 06:52:06,956 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 12 Invalid, 18 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-19 06:52:06,974 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7 states. [2022-11-19 06:52:06,985 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7 to 7. [2022-11-19 06:52:06,987 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) [2022-11-19 06:52:06,988 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 7 transitions. [2022-11-19 06:52:06,989 INFO L78 Accepts]: Start accepts. Automaton has 7 states and 7 transitions. Word has length 5 [2022-11-19 06:52:06,989 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:52:06,990 INFO L495 AbstractCegarLoop]: Abstraction has 7 states and 7 transitions. [2022-11-19 06:52:06,990 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.25) internal successors, (5), 4 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:52:06,990 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states and 7 transitions. [2022-11-19 06:52:06,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-11-19 06:52:06,991 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:52:06,991 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-11-19 06:52:06,992 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-19 06:52:06,992 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:52:06,993 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:52:06,993 INFO L85 PathProgramCache]: Analyzing trace with hash 1925759241, now seen corresponding path program 1 times [2022-11-19 06:52:06,994 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:52:06,994 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1872010507] [2022-11-19 06:52:06,994 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:52:06,995 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:52:07,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:52:07,149 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 06:52:07,149 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:52:07,150 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1872010507] [2022-11-19 06:52:07,150 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1872010507] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:52:07,150 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1568823869] [2022-11-19 06:52:07,150 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:52:07,151 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:52:07,151 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c9291b9-85f5-47ae-bc9c-de975cbc7bab/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:52:07,155 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c9291b9-85f5-47ae-bc9c-de975cbc7bab/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:52:07,196 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c9291b9-85f5-47ae-bc9c-de975cbc7bab/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-19 06:52:07,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:52:07,234 INFO L263 TraceCheckSpWp]: Trace formula consists of 38 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-19 06:52:07,239 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:52:07,303 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 06:52:07,304 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:52:07,368 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 06:52:07,368 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1568823869] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:52:07,369 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1799818255] [2022-11-19 06:52:07,392 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2022-11-19 06:52:07,392 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:52:07,396 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 06:52:07,402 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 06:52:07,402 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 06:52:07,554 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 06:52:07,739 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '96#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (not (< |ULTIMATE.start_main_~i~0#1| (* 1000000 |ULTIMATE.start_main_~k~0#1|))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_main_~k~0#1| 10) (= (ite (= |ULTIMATE.start_main_~i~0#1| (* 1000000 |ULTIMATE.start_main_~k~0#1|)) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 06:52:07,739 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 06:52:07,739 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 06:52:07,740 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4, 4] total 9 [2022-11-19 06:52:07,741 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [163220516] [2022-11-19 06:52:07,741 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 06:52:07,742 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-11-19 06:52:07,742 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:52:07,743 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-11-19 06:52:07,743 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2022-11-19 06:52:07,743 INFO L87 Difference]: Start difference. First operand 7 states and 7 transitions. Second operand has 9 states, 9 states have (on average 1.4444444444444444) internal successors, (13), 9 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:52:07,782 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:52:07,782 INFO L93 Difference]: Finished difference Result 12 states and 13 transitions. [2022-11-19 06:52:07,782 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-19 06:52:07,783 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.4444444444444444) internal successors, (13), 9 states have internal predecessors, (13), 0 states have call successors, (0), 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 [2022-11-19 06:52:07,783 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:52:07,783 INFO L225 Difference]: With dead ends: 12 [2022-11-19 06:52:07,783 INFO L226 Difference]: Without dead ends: 9 [2022-11-19 06:52:07,784 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2022-11-19 06:52:07,785 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-19 06:52:07,786 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 11 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-19 06:52:07,787 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2022-11-19 06:52:07,789 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2022-11-19 06:52:07,789 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) [2022-11-19 06:52:07,790 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 9 transitions. [2022-11-19 06:52:07,790 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 9 transitions. Word has length 6 [2022-11-19 06:52:07,790 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:52:07,790 INFO L495 AbstractCegarLoop]: Abstraction has 9 states and 9 transitions. [2022-11-19 06:52:07,791 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 1.4444444444444444) internal successors, (13), 9 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:52:07,791 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 9 transitions. [2022-11-19 06:52:07,791 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-11-19 06:52:07,791 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:52:07,791 INFO L195 NwaCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1] [2022-11-19 06:52:07,802 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c9291b9-85f5-47ae-bc9c-de975cbc7bab/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2022-11-19 06:52:07,996 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c9291b9-85f5-47ae-bc9c-de975cbc7bab/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:52:07,997 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:52:07,998 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:52:07,998 INFO L85 PathProgramCache]: Analyzing trace with hash -478643031, now seen corresponding path program 2 times [2022-11-19 06:52:07,998 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:52:07,998 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [559671657] [2022-11-19 06:52:07,998 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:52:07,998 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:52:08,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:52:08,145 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 06:52:08,145 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:52:08,145 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [559671657] [2022-11-19 06:52:08,145 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [559671657] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:52:08,146 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1411682398] [2022-11-19 06:52:08,146 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 06:52:08,146 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:52:08,146 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c9291b9-85f5-47ae-bc9c-de975cbc7bab/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:52:08,147 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c9291b9-85f5-47ae-bc9c-de975cbc7bab/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:52:08,151 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c9291b9-85f5-47ae-bc9c-de975cbc7bab/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-19 06:52:08,203 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-19 06:52:08,203 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 06:52:08,204 INFO L263 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 6 conjunts are in the unsatisfiable core [2022-11-19 06:52:08,207 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:52:08,290 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 06:52:08,290 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:52:08,381 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 06:52:08,381 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1411682398] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:52:08,382 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [318858551] [2022-11-19 06:52:08,388 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2022-11-19 06:52:08,388 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:52:08,389 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 06:52:08,389 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 06:52:08,389 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 06:52:08,482 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 06:52:08,681 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '183#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (not (< |ULTIMATE.start_main_~i~0#1| (* 1000000 |ULTIMATE.start_main_~k~0#1|))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_main_~k~0#1| 10) (= (ite (= |ULTIMATE.start_main_~i~0#1| (* 1000000 |ULTIMATE.start_main_~k~0#1|)) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 06:52:08,681 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 06:52:08,682 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 06:52:08,682 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2022-11-19 06:52:08,682 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1522991089] [2022-11-19 06:52:08,683 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 06:52:08,683 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-11-19 06:52:08,683 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:52:08,684 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-11-19 06:52:08,685 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=187, Unknown=0, NotChecked=0, Total=240 [2022-11-19 06:52:08,685 INFO L87 Difference]: Start difference. First operand 9 states and 9 transitions. Second operand has 12 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 12 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:52:08,831 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:52:08,831 INFO L93 Difference]: Finished difference Result 16 states and 19 transitions. [2022-11-19 06:52:08,832 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-11-19 06:52:08,832 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 12 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) Word has length 8 [2022-11-19 06:52:08,832 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:52:08,833 INFO L225 Difference]: With dead ends: 16 [2022-11-19 06:52:08,833 INFO L226 Difference]: Without dead ends: 13 [2022-11-19 06:52:08,834 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=98, Invalid=322, Unknown=0, NotChecked=0, Total=420 [2022-11-19 06:52:08,838 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 2 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 31 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-19 06:52:08,841 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 13 Invalid, 31 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-19 06:52:08,842 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2022-11-19 06:52:08,845 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2022-11-19 06:52:08,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.0833333333333333) internal successors, (13), 12 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:52:08,846 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2022-11-19 06:52:08,846 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 8 [2022-11-19 06:52:08,846 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:52:08,848 INFO L495 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2022-11-19 06:52:08,849 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 12 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:52:08,849 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2022-11-19 06:52:08,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-11-19 06:52:08,851 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:52:08,851 INFO L195 NwaCegarLoop]: trace histogram [7, 1, 1, 1, 1, 1] [2022-11-19 06:52:08,862 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c9291b9-85f5-47ae-bc9c-de975cbc7bab/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-19 06:52:09,057 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c9291b9-85f5-47ae-bc9c-de975cbc7bab/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:52:09,057 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:52:09,058 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:52:09,058 INFO L85 PathProgramCache]: Analyzing trace with hash -1135559703, now seen corresponding path program 3 times [2022-11-19 06:52:09,058 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:52:09,058 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1147702295] [2022-11-19 06:52:09,058 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:52:09,059 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:52:09,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:52:09,294 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 06:52:09,294 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:52:09,294 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1147702295] [2022-11-19 06:52:09,295 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1147702295] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:52:09,295 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1513788671] [2022-11-19 06:52:09,295 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 06:52:09,295 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:52:09,296 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c9291b9-85f5-47ae-bc9c-de975cbc7bab/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:52:09,297 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c9291b9-85f5-47ae-bc9c-de975cbc7bab/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:52:09,306 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c9291b9-85f5-47ae-bc9c-de975cbc7bab/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-19 06:52:09,349 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 06:52:09,350 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 06:52:09,351 INFO L263 TraceCheckSpWp]: Trace formula consists of 56 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-19 06:52:09,352 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:52:09,440 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 06:52:09,440 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:52:09,674 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 06:52:09,675 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1513788671] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:52:09,675 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1330572822] [2022-11-19 06:52:09,679 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2022-11-19 06:52:09,681 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:52:09,682 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 06:52:09,682 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 06:52:09,682 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 06:52:09,754 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 06:52:09,956 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '328#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (not (< |ULTIMATE.start_main_~i~0#1| (* 1000000 |ULTIMATE.start_main_~k~0#1|))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_main_~k~0#1| 10) (= (ite (= |ULTIMATE.start_main_~i~0#1| (* 1000000 |ULTIMATE.start_main_~k~0#1|)) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 06:52:09,957 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 06:52:09,957 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 06:52:09,957 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 20 [2022-11-19 06:52:09,957 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [893790303] [2022-11-19 06:52:09,958 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 06:52:09,958 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-11-19 06:52:09,958 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:52:09,959 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-11-19 06:52:09,959 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=421, Unknown=0, NotChecked=0, Total=552 [2022-11-19 06:52:09,959 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand has 20 states, 20 states have (on average 1.25) internal successors, (25), 20 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:52:10,359 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:52:10,360 INFO L93 Difference]: Finished difference Result 24 states and 31 transitions. [2022-11-19 06:52:10,360 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-11-19 06:52:10,360 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.25) internal successors, (25), 20 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2022-11-19 06:52:10,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:52:10,361 INFO L225 Difference]: With dead ends: 24 [2022-11-19 06:52:10,361 INFO L226 Difference]: Without dead ends: 21 [2022-11-19 06:52:10,362 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 21 SyntacticMatches, 1 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 227 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=352, Invalid=980, Unknown=0, NotChecked=0, Total=1332 [2022-11-19 06:52:10,363 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 2 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 56 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 06:52:10,363 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 15 Invalid, 56 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 06:52:10,364 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2022-11-19 06:52:10,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2022-11-19 06:52:10,370 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 20 states have (on average 1.05) internal successors, (21), 20 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:52:10,370 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2022-11-19 06:52:10,370 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 12 [2022-11-19 06:52:10,371 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:52:10,371 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2022-11-19 06:52:10,371 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.25) internal successors, (25), 20 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:52:10,371 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2022-11-19 06:52:10,372 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-11-19 06:52:10,372 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:52:10,372 INFO L195 NwaCegarLoop]: trace histogram [15, 1, 1, 1, 1, 1] [2022-11-19 06:52:10,391 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c9291b9-85f5-47ae-bc9c-de975cbc7bab/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-19 06:52:10,578 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c9291b9-85f5-47ae-bc9c-de975cbc7bab/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:52:10,578 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:52:10,578 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:52:10,579 INFO L85 PathProgramCache]: Analyzing trace with hash 1304189545, now seen corresponding path program 4 times [2022-11-19 06:52:10,579 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:52:10,579 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2012783066] [2022-11-19 06:52:10,579 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:52:10,579 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:52:10,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:52:10,954 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 06:52:10,955 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:52:10,955 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2012783066] [2022-11-19 06:52:10,955 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2012783066] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:52:10,955 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [179413670] [2022-11-19 06:52:10,955 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 06:52:10,955 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:52:10,956 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c9291b9-85f5-47ae-bc9c-de975cbc7bab/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:52:10,957 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c9291b9-85f5-47ae-bc9c-de975cbc7bab/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:52:10,961 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c9291b9-85f5-47ae-bc9c-de975cbc7bab/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-19 06:52:11,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:52:11,013 INFO L263 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-19 06:52:11,015 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:52:11,170 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 06:52:11,170 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:52:11,803 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 06:52:11,803 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [179413670] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:52:11,803 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [762269734] [2022-11-19 06:52:11,805 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2022-11-19 06:52:11,805 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:52:11,806 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 06:52:11,806 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 06:52:11,806 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 06:52:11,851 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 06:52:12,081 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '585#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (not (< |ULTIMATE.start_main_~i~0#1| (* 1000000 |ULTIMATE.start_main_~k~0#1|))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_main_~k~0#1| 10) (= (ite (= |ULTIMATE.start_main_~i~0#1| (* 1000000 |ULTIMATE.start_main_~k~0#1|)) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 06:52:12,081 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 06:52:12,081 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 06:52:12,081 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 36 [2022-11-19 06:52:12,082 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1901257962] [2022-11-19 06:52:12,082 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 06:52:12,082 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2022-11-19 06:52:12,082 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:52:12,083 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2022-11-19 06:52:12,084 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=431, Invalid=1129, Unknown=0, NotChecked=0, Total=1560 [2022-11-19 06:52:12,084 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand has 36 states, 36 states have (on average 1.1388888888888888) internal successors, (41), 36 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:52:13,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:52:13,360 INFO L93 Difference]: Finished difference Result 40 states and 55 transitions. [2022-11-19 06:52:13,361 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-11-19 06:52:13,361 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 1.1388888888888888) internal successors, (41), 36 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2022-11-19 06:52:13,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:52:13,362 INFO L225 Difference]: With dead ends: 40 [2022-11-19 06:52:13,362 INFO L226 Difference]: Without dead ends: 37 [2022-11-19 06:52:13,363 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 37 SyntacticMatches, 1 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 895 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1388, Invalid=3304, Unknown=0, NotChecked=0, Total=4692 [2022-11-19 06:52:13,364 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 2 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 47 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 98 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 06:52:13,365 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 13 Invalid, 98 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [47 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 06:52:13,365 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2022-11-19 06:52:13,373 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2022-11-19 06:52:13,373 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 36 states have (on average 1.0277777777777777) internal successors, (37), 36 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:52:13,374 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2022-11-19 06:52:13,374 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 20 [2022-11-19 06:52:13,375 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:52:13,375 INFO L495 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2022-11-19 06:52:13,375 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 1.1388888888888888) internal successors, (41), 36 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:52:13,376 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2022-11-19 06:52:13,376 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-11-19 06:52:13,376 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:52:13,377 INFO L195 NwaCegarLoop]: trace histogram [31, 1, 1, 1, 1, 1] [2022-11-19 06:52:13,387 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c9291b9-85f5-47ae-bc9c-de975cbc7bab/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-19 06:52:13,582 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c9291b9-85f5-47ae-bc9c-de975cbc7bab/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:52:13,583 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:52:13,583 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:52:13,583 INFO L85 PathProgramCache]: Analyzing trace with hash 708843369, now seen corresponding path program 5 times [2022-11-19 06:52:13,583 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:52:13,583 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [913350280] [2022-11-19 06:52:13,584 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:52:13,584 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:52:13,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:52:14,552 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 06:52:14,553 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:52:14,553 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [913350280] [2022-11-19 06:52:14,553 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [913350280] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:52:14,553 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1628360067] [2022-11-19 06:52:14,553 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 06:52:14,553 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:52:14,554 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c9291b9-85f5-47ae-bc9c-de975cbc7bab/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:52:14,555 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c9291b9-85f5-47ae-bc9c-de975cbc7bab/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:52:14,568 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c9291b9-85f5-47ae-bc9c-de975cbc7bab/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-19 06:52:14,626 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2022-11-19 06:52:14,626 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 06:52:14,628 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 34 conjunts are in the unsatisfiable core [2022-11-19 06:52:14,631 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:52:14,917 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 06:52:14,917 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:52:16,975 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 06:52:16,976 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1628360067] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:52:16,976 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1240637802] [2022-11-19 06:52:16,978 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2022-11-19 06:52:16,978 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:52:16,978 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 06:52:16,979 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 06:52:16,979 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 06:52:17,030 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 06:52:17,378 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1066#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (not (< |ULTIMATE.start_main_~i~0#1| (* 1000000 |ULTIMATE.start_main_~k~0#1|))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_main_~k~0#1| 10) (= (ite (= |ULTIMATE.start_main_~i~0#1| (* 1000000 |ULTIMATE.start_main_~k~0#1|)) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 06:52:17,378 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 06:52:17,379 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 06:52:17,379 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 68 [2022-11-19 06:52:17,379 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1044298859] [2022-11-19 06:52:17,379 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 06:52:17,380 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 68 states [2022-11-19 06:52:17,380 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:52:17,381 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2022-11-19 06:52:17,383 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1607, Invalid=3505, Unknown=0, NotChecked=0, Total=5112 [2022-11-19 06:52:17,383 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand has 68 states, 68 states have (on average 1.0735294117647058) internal successors, (73), 68 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:52:21,732 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:52:21,733 INFO L93 Difference]: Finished difference Result 72 states and 103 transitions. [2022-11-19 06:52:21,733 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2022-11-19 06:52:21,734 INFO L78 Accepts]: Start accepts. Automaton has has 68 states, 68 states have (on average 1.0735294117647058) internal successors, (73), 68 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 36 [2022-11-19 06:52:21,734 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:52:21,735 INFO L225 Difference]: With dead ends: 72 [2022-11-19 06:52:21,735 INFO L226 Difference]: Without dead ends: 69 [2022-11-19 06:52:21,743 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 69 SyntacticMatches, 1 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3575 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=5572, Invalid=11984, Unknown=0, NotChecked=0, Total=17556 [2022-11-19 06:52:21,744 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 2 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 82 mSolverCounterSat, 94 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 176 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 94 IncrementalHoareTripleChecker+Valid, 82 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-19 06:52:21,744 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 15 Invalid, 176 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [94 Valid, 82 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-19 06:52:21,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2022-11-19 06:52:21,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2022-11-19 06:52:21,760 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 68 states have (on average 1.0147058823529411) internal successors, (69), 68 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:52:21,761 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 69 transitions. [2022-11-19 06:52:21,761 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 69 transitions. Word has length 36 [2022-11-19 06:52:21,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:52:21,762 INFO L495 AbstractCegarLoop]: Abstraction has 69 states and 69 transitions. [2022-11-19 06:52:21,762 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 68 states, 68 states have (on average 1.0735294117647058) internal successors, (73), 68 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:52:21,762 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 69 transitions. [2022-11-19 06:52:21,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2022-11-19 06:52:21,764 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:52:21,764 INFO L195 NwaCegarLoop]: trace histogram [63, 1, 1, 1, 1, 1] [2022-11-19 06:52:21,778 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c9291b9-85f5-47ae-bc9c-de975cbc7bab/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-19 06:52:21,971 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c9291b9-85f5-47ae-bc9c-de975cbc7bab/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:52:21,971 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:52:21,972 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:52:21,972 INFO L85 PathProgramCache]: Analyzing trace with hash 1610191209, now seen corresponding path program 6 times [2022-11-19 06:52:21,972 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:52:21,972 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1088052081] [2022-11-19 06:52:21,972 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:52:21,972 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:52:22,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:52:25,231 INFO L134 CoverageAnalysis]: Checked inductivity of 2016 backedges. 0 proven. 2016 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 06:52:25,231 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:52:25,232 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1088052081] [2022-11-19 06:52:25,232 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1088052081] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:52:25,232 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [914522252] [2022-11-19 06:52:25,232 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 06:52:25,232 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:52:25,232 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c9291b9-85f5-47ae-bc9c-de975cbc7bab/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:52:25,237 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c9291b9-85f5-47ae-bc9c-de975cbc7bab/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:52:25,238 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c9291b9-85f5-47ae-bc9c-de975cbc7bab/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-19 06:52:25,518 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 06:52:25,518 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 06:52:25,620 INFO L263 TraceCheckSpWp]: Trace formula consists of 224 conjuncts, 66 conjunts are in the unsatisfiable core [2022-11-19 06:52:25,623 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:52:26,056 INFO L134 CoverageAnalysis]: Checked inductivity of 2016 backedges. 0 proven. 2016 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 06:52:26,056 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:52:33,730 INFO L134 CoverageAnalysis]: Checked inductivity of 2016 backedges. 0 proven. 2016 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 06:52:33,730 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [914522252] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:52:33,730 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1862829070] [2022-11-19 06:52:33,732 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2022-11-19 06:52:33,732 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:52:33,732 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 06:52:33,732 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 06:52:33,733 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 06:52:33,811 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 06:52:34,365 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1995#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (not (< |ULTIMATE.start_main_~i~0#1| (* 1000000 |ULTIMATE.start_main_~k~0#1|))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_main_~k~0#1| 10) (= (ite (= |ULTIMATE.start_main_~i~0#1| (* 1000000 |ULTIMATE.start_main_~k~0#1|)) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 06:52:34,365 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 06:52:34,365 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 06:52:34,365 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [66, 66, 66] total 132 [2022-11-19 06:52:34,366 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1992098748] [2022-11-19 06:52:34,366 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 06:52:34,367 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 132 states [2022-11-19 06:52:34,367 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:52:34,371 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 132 interpolants. [2022-11-19 06:52:34,376 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6263, Invalid=12097, Unknown=0, NotChecked=0, Total=18360 [2022-11-19 06:52:34,376 INFO L87 Difference]: Start difference. First operand 69 states and 69 transitions. Second operand has 132 states, 132 states have (on average 1.0378787878787878) internal successors, (137), 132 states have internal predecessors, (137), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:52:54,571 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:52:54,571 INFO L93 Difference]: Finished difference Result 136 states and 199 transitions. [2022-11-19 06:52:54,571 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 130 states. [2022-11-19 06:52:54,572 INFO L78 Accepts]: Start accepts. Automaton has has 132 states, 132 states have (on average 1.0378787878787878) internal successors, (137), 132 states have internal predecessors, (137), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 68 [2022-11-19 06:52:54,573 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:52:54,574 INFO L225 Difference]: With dead ends: 136 [2022-11-19 06:52:54,574 INFO L226 Difference]: Without dead ends: 133 [2022-11-19 06:52:54,584 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 393 GetRequests, 133 SyntacticMatches, 1 SemanticMatches, 259 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14311 ImplicationChecksByTransitivity, 29.7s TimeCoverageRelationStatistics Valid=22388, Invalid=45472, Unknown=0, NotChecked=0, Total=67860 [2022-11-19 06:52:54,585 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 2 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 152 mSolverCounterSat, 189 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 341 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 189 IncrementalHoareTripleChecker+Valid, 152 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-19 06:52:54,585 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 19 Invalid, 341 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [189 Valid, 152 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-19 06:52:54,586 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2022-11-19 06:52:54,610 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 133. [2022-11-19 06:52:54,611 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 132 states have (on average 1.0075757575757576) internal successors, (133), 132 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:52:54,612 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 133 transitions. [2022-11-19 06:52:54,612 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 133 transitions. Word has length 68 [2022-11-19 06:52:54,613 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:52:54,613 INFO L495 AbstractCegarLoop]: Abstraction has 133 states and 133 transitions. [2022-11-19 06:52:54,614 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 132 states, 132 states have (on average 1.0378787878787878) internal successors, (137), 132 states have internal predecessors, (137), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:52:54,614 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 133 transitions. [2022-11-19 06:52:54,616 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2022-11-19 06:52:54,616 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:52:54,617 INFO L195 NwaCegarLoop]: trace histogram [127, 1, 1, 1, 1, 1] [2022-11-19 06:52:54,624 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c9291b9-85f5-47ae-bc9c-de975cbc7bab/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2022-11-19 06:52:54,823 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c9291b9-85f5-47ae-bc9c-de975cbc7bab/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:52:54,824 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:52:54,824 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:52:54,824 INFO L85 PathProgramCache]: Analyzing trace with hash 1848935785, now seen corresponding path program 7 times [2022-11-19 06:52:54,824 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:52:54,825 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [325139126] [2022-11-19 06:52:54,825 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:52:54,825 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:52:55,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:53:08,173 INFO L134 CoverageAnalysis]: Checked inductivity of 8128 backedges. 0 proven. 8128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 06:53:08,173 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:53:08,173 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [325139126] [2022-11-19 06:53:08,173 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [325139126] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:53:08,173 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1786445277] [2022-11-19 06:53:08,174 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 06:53:08,174 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:53:08,174 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c9291b9-85f5-47ae-bc9c-de975cbc7bab/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:53:08,175 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c9291b9-85f5-47ae-bc9c-de975cbc7bab/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:53:08,177 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c9291b9-85f5-47ae-bc9c-de975cbc7bab/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-19 06:53:09,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:53:10,460 INFO L263 TraceCheckSpWp]: Trace formula consists of 416 conjuncts, 130 conjunts are in the unsatisfiable core [2022-11-19 06:53:10,465 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:53:11,144 INFO L134 CoverageAnalysis]: Checked inductivity of 8128 backedges. 0 proven. 8128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 06:53:11,144 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:53:39,672 INFO L134 CoverageAnalysis]: Checked inductivity of 8128 backedges. 0 proven. 8128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 06:53:39,673 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1786445277] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:53:39,673 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [998412080] [2022-11-19 06:53:39,675 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2022-11-19 06:53:39,675 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:53:39,675 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 06:53:39,676 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 06:53:39,676 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 06:53:39,725 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 06:53:40,841 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3820#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (not (< |ULTIMATE.start_main_~i~0#1| (* 1000000 |ULTIMATE.start_main_~k~0#1|))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_main_~k~0#1| 10) (= (ite (= |ULTIMATE.start_main_~i~0#1| (* 1000000 |ULTIMATE.start_main_~k~0#1|)) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 06:53:40,842 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 06:53:40,842 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 06:53:40,842 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [130, 130, 130] total 260 [2022-11-19 06:53:40,842 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2096211619] [2022-11-19 06:53:40,842 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 06:53:40,843 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 260 states [2022-11-19 06:53:40,844 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:53:40,850 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 260 interpolants. [2022-11-19 06:53:40,855 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24791, Invalid=44641, Unknown=0, NotChecked=0, Total=69432 [2022-11-19 06:53:40,856 INFO L87 Difference]: Start difference. First operand 133 states and 133 transitions. Second operand has 260 states, 260 states have (on average 1.0192307692307692) internal successors, (265), 260 states have internal predecessors, (265), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:55:23,141 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:55:23,141 INFO L93 Difference]: Finished difference Result 264 states and 391 transitions. [2022-11-19 06:55:23,142 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 258 states. [2022-11-19 06:55:23,142 INFO L78 Accepts]: Start accepts. Automaton has has 260 states, 260 states have (on average 1.0192307692307692) internal successors, (265), 260 states have internal predecessors, (265), 0 states have call successors, (0), 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 132 [2022-11-19 06:55:23,143 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:55:23,145 INFO L225 Difference]: With dead ends: 264 [2022-11-19 06:55:23,146 INFO L226 Difference]: Without dead ends: 261 [2022-11-19 06:55:23,159 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 777 GetRequests, 261 SyntacticMatches, 1 SemanticMatches, 515 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57287 ImplicationChecksByTransitivity, 138.6s TimeCoverageRelationStatistics Valid=89812, Invalid=176960, Unknown=0, NotChecked=0, Total=266772 [2022-11-19 06:55:23,160 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 2 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 286 mSolverCounterSat, 381 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 667 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 381 IncrementalHoareTripleChecker+Valid, 286 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-19 06:55:23,160 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 25 Invalid, 667 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [381 Valid, 286 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-19 06:55:23,161 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 261 states. [2022-11-19 06:55:23,196 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 261 to 261. [2022-11-19 06:55:23,196 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 261 states, 260 states have (on average 1.0038461538461538) internal successors, (261), 260 states have internal predecessors, (261), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:55:23,198 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 261 states to 261 states and 261 transitions. [2022-11-19 06:55:23,199 INFO L78 Accepts]: Start accepts. Automaton has 261 states and 261 transitions. Word has length 132 [2022-11-19 06:55:23,199 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:55:23,199 INFO L495 AbstractCegarLoop]: Abstraction has 261 states and 261 transitions. [2022-11-19 06:55:23,200 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 260 states, 260 states have (on average 1.0192307692307692) internal successors, (265), 260 states have internal predecessors, (265), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:55:23,200 INFO L276 IsEmpty]: Start isEmpty. Operand 261 states and 261 transitions. [2022-11-19 06:55:23,205 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 261 [2022-11-19 06:55:23,206 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:55:23,206 INFO L195 NwaCegarLoop]: trace histogram [255, 1, 1, 1, 1, 1] [2022-11-19 06:55:23,223 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c9291b9-85f5-47ae-bc9c-de975cbc7bab/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-19 06:55:23,417 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c9291b9-85f5-47ae-bc9c-de975cbc7bab/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:55:23,417 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:55:23,418 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:55:23,418 INFO L85 PathProgramCache]: Analyzing trace with hash -1781895831, now seen corresponding path program 8 times [2022-11-19 06:55:23,418 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:55:23,418 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1426836062] [2022-11-19 06:55:23,418 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:55:23,418 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:55:27,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:56:11,214 INFO L134 CoverageAnalysis]: Checked inductivity of 32640 backedges. 0 proven. 32640 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 06:56:11,214 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:56:11,214 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1426836062] [2022-11-19 06:56:11,214 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1426836062] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:56:11,215 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2053467481] [2022-11-19 06:56:11,215 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 06:56:11,215 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:56:11,215 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c9291b9-85f5-47ae-bc9c-de975cbc7bab/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:56:11,217 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c9291b9-85f5-47ae-bc9c-de975cbc7bab/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:56:11,219 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c9291b9-85f5-47ae-bc9c-de975cbc7bab/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-19 06:56:11,789 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 129 check-sat command(s) [2022-11-19 06:56:11,790 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 06:56:11,813 INFO L263 TraceCheckSpWp]: Trace formula consists of 800 conjuncts, 258 conjunts are in the unsatisfiable core [2022-11-19 06:56:11,824 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:56:13,183 INFO L134 CoverageAnalysis]: Checked inductivity of 32640 backedges. 0 proven. 32640 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 06:56:13,183 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:57:58,851 INFO L134 CoverageAnalysis]: Checked inductivity of 32640 backedges. 0 proven. 32640 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 06:57:58,852 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2053467481] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:57:58,852 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1529380922] [2022-11-19 06:57:58,854 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2022-11-19 06:57:58,855 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:57:58,855 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 06:57:58,855 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 06:57:58,855 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 06:57:58,897 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 06:58:00,689 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7437#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (not (< |ULTIMATE.start_main_~i~0#1| (* 1000000 |ULTIMATE.start_main_~k~0#1|))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_main_~k~0#1| 10) (= (ite (= |ULTIMATE.start_main_~i~0#1| (* 1000000 |ULTIMATE.start_main_~k~0#1|)) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 06:58:00,689 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 06:58:00,689 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 06:58:00,690 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [258, 258, 258] total 516 [2022-11-19 06:58:00,690 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [866021684] [2022-11-19 06:58:00,690 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 06:58:00,692 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 516 states [2022-11-19 06:58:00,692 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:58:00,705 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 516 interpolants. [2022-11-19 06:58:00,715 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=98711, Invalid=171169, Unknown=0, NotChecked=0, Total=269880 [2022-11-19 06:58:00,716 INFO L87 Difference]: Start difference. First operand 261 states and 261 transitions. Second operand has 516 states, 516 states have (on average 1.0096899224806202) internal successors, (521), 516 states have internal predecessors, (521), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)