./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loops/invert_string-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 2329fc70 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_0f6868c6-0041-4de4-8281-960c42c192df/bin/utaipan-gh47qXpMRh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6868c6-0041-4de4-8281-960c42c192df/bin/utaipan-gh47qXpMRh/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6868c6-0041-4de4-8281-960c42c192df/bin/utaipan-gh47qXpMRh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6868c6-0041-4de4-8281-960c42c192df/bin/utaipan-gh47qXpMRh/config/TaipanReach.xml -i ../../sv-benchmarks/c/loops/invert_string-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6868c6-0041-4de4-8281-960c42c192df/bin/utaipan-gh47qXpMRh/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6868c6-0041-4de4-8281-960c42c192df/bin/utaipan-gh47qXpMRh --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash b3da85103e65fd13a584e838d8b961878044a0a70e09ad1788e3ca53a404f357 --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-2329fc7 [2022-12-14 15:31:18,258 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-12-14 15:31:18,260 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-12-14 15:31:18,284 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-12-14 15:31:18,284 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-12-14 15:31:18,285 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-12-14 15:31:18,287 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-12-14 15:31:18,288 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-12-14 15:31:18,290 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-12-14 15:31:18,290 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-12-14 15:31:18,291 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-12-14 15:31:18,292 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-12-14 15:31:18,292 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-12-14 15:31:18,293 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-12-14 15:31:18,294 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-12-14 15:31:18,295 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-12-14 15:31:18,296 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-12-14 15:31:18,297 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-12-14 15:31:18,299 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-12-14 15:31:18,300 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-12-14 15:31:18,301 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-12-14 15:31:18,303 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-12-14 15:31:18,304 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-12-14 15:31:18,305 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-12-14 15:31:18,308 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-12-14 15:31:18,308 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-12-14 15:31:18,308 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-12-14 15:31:18,309 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-12-14 15:31:18,310 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-12-14 15:31:18,310 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-12-14 15:31:18,311 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-12-14 15:31:18,312 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-12-14 15:31:18,312 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-12-14 15:31:18,313 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-12-14 15:31:18,314 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-12-14 15:31:18,314 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-12-14 15:31:18,315 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-12-14 15:31:18,315 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-12-14 15:31:18,315 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-12-14 15:31:18,316 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-12-14 15:31:18,316 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-12-14 15:31:18,317 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6868c6-0041-4de4-8281-960c42c192df/bin/utaipan-gh47qXpMRh/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-12-14 15:31:18,339 INFO L113 SettingsManager]: Loading preferences was successful [2022-12-14 15:31:18,340 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-12-14 15:31:18,340 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-12-14 15:31:18,340 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-12-14 15:31:18,341 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-12-14 15:31:18,341 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-12-14 15:31:18,341 INFO L138 SettingsManager]: * User list type=DISABLED [2022-12-14 15:31:18,341 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-12-14 15:31:18,342 INFO L138 SettingsManager]: * Explicit value domain=true [2022-12-14 15:31:18,342 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-12-14 15:31:18,342 INFO L138 SettingsManager]: * Octagon Domain=false [2022-12-14 15:31:18,342 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-12-14 15:31:18,342 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-12-14 15:31:18,343 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-12-14 15:31:18,343 INFO L138 SettingsManager]: * Interval Domain=false [2022-12-14 15:31:18,343 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-12-14 15:31:18,343 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-12-14 15:31:18,343 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-12-14 15:31:18,344 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-12-14 15:31:18,344 INFO L138 SettingsManager]: * sizeof long=4 [2022-12-14 15:31:18,344 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-12-14 15:31:18,344 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-12-14 15:31:18,344 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-12-14 15:31:18,345 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-12-14 15:31:18,345 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-12-14 15:31:18,345 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-12-14 15:31:18,345 INFO L138 SettingsManager]: * sizeof long double=12 [2022-12-14 15:31:18,345 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-12-14 15:31:18,345 INFO L138 SettingsManager]: * Use constant arrays=true [2022-12-14 15:31:18,346 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-12-14 15:31:18,346 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-12-14 15:31:18,346 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-12-14 15:31:18,346 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 15:31:18,347 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-12-14 15:31:18,347 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-12-14 15:31:18,347 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-12-14 15:31:18,347 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-12-14 15:31:18,347 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-12-14 15:31:18,347 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-12-14 15:31:18,347 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-12-14 15:31:18,348 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-12-14 15:31:18,348 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_0f6868c6-0041-4de4-8281-960c42c192df/bin/utaipan-gh47qXpMRh/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6868c6-0041-4de4-8281-960c42c192df/bin/utaipan-gh47qXpMRh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> b3da85103e65fd13a584e838d8b961878044a0a70e09ad1788e3ca53a404f357 [2022-12-14 15:31:18,531 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-12-14 15:31:18,547 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-12-14 15:31:18,549 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-12-14 15:31:18,550 INFO L271 PluginConnector]: Initializing CDTParser... [2022-12-14 15:31:18,550 INFO L275 PluginConnector]: CDTParser initialized [2022-12-14 15:31:18,551 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6868c6-0041-4de4-8281-960c42c192df/bin/utaipan-gh47qXpMRh/../../sv-benchmarks/c/loops/invert_string-1.c [2022-12-14 15:31:21,168 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-12-14 15:31:21,290 INFO L351 CDTParser]: Found 1 translation units. [2022-12-14 15:31:21,291 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6868c6-0041-4de4-8281-960c42c192df/sv-benchmarks/c/loops/invert_string-1.c [2022-12-14 15:31:21,296 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6868c6-0041-4de4-8281-960c42c192df/bin/utaipan-gh47qXpMRh/data/b3c59ebd4/9a20fe4c02ce4afc9f89f928501d87e7/FLAG188a20cfb [2022-12-14 15:31:21,309 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6868c6-0041-4de4-8281-960c42c192df/bin/utaipan-gh47qXpMRh/data/b3c59ebd4/9a20fe4c02ce4afc9f89f928501d87e7 [2022-12-14 15:31:21,312 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-12-14 15:31:21,313 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-12-14 15:31:21,315 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-12-14 15:31:21,315 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-12-14 15:31:21,318 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-12-14 15:31:21,319 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 03:31:21" (1/1) ... [2022-12-14 15:31:21,320 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2b444343 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:31:21, skipping insertion in model container [2022-12-14 15:31:21,320 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 03:31:21" (1/1) ... [2022-12-14 15:31:21,326 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-12-14 15:31:21,336 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-12-14 15:31:21,449 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6868c6-0041-4de4-8281-960c42c192df/sv-benchmarks/c/loops/invert_string-1.c[352,365] [2022-12-14 15:31:21,468 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 15:31:21,476 INFO L203 MainTranslator]: Completed pre-run [2022-12-14 15:31:21,487 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6868c6-0041-4de4-8281-960c42c192df/sv-benchmarks/c/loops/invert_string-1.c[352,365] [2022-12-14 15:31:21,495 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 15:31:21,508 INFO L208 MainTranslator]: Completed translation [2022-12-14 15:31:21,509 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:31:21 WrapperNode [2022-12-14 15:31:21,509 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-12-14 15:31:21,510 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-12-14 15:31:21,510 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-12-14 15:31:21,510 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-12-14 15:31:21,517 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:31:21" (1/1) ... [2022-12-14 15:31:21,524 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:31:21" (1/1) ... [2022-12-14 15:31:21,542 INFO L138 Inliner]: procedures = 15, calls = 18, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 74 [2022-12-14 15:31:21,543 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-12-14 15:31:21,543 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-12-14 15:31:21,544 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-12-14 15:31:21,544 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-12-14 15:31:21,552 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:31:21" (1/1) ... [2022-12-14 15:31:21,552 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:31:21" (1/1) ... [2022-12-14 15:31:21,554 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:31:21" (1/1) ... [2022-12-14 15:31:21,554 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:31:21" (1/1) ... [2022-12-14 15:31:21,560 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:31:21" (1/1) ... [2022-12-14 15:31:21,563 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:31:21" (1/1) ... [2022-12-14 15:31:21,565 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:31:21" (1/1) ... [2022-12-14 15:31:21,566 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:31:21" (1/1) ... [2022-12-14 15:31:21,568 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-12-14 15:31:21,569 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-12-14 15:31:21,569 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-12-14 15:31:21,569 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-12-14 15:31:21,571 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:31:21" (1/1) ... [2022-12-14 15:31:21,577 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 15:31:21,588 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6868c6-0041-4de4-8281-960c42c192df/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:31:21,598 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6868c6-0041-4de4-8281-960c42c192df/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-12-14 15:31:21,600 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6868c6-0041-4de4-8281-960c42c192df/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-12-14 15:31:21,627 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-12-14 15:31:21,628 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-12-14 15:31:21,628 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-12-14 15:31:21,628 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-12-14 15:31:21,628 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-12-14 15:31:21,628 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-12-14 15:31:21,628 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-12-14 15:31:21,628 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-12-14 15:31:21,685 INFO L235 CfgBuilder]: Building ICFG [2022-12-14 15:31:21,687 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-12-14 15:31:21,820 INFO L276 CfgBuilder]: Performing block encoding [2022-12-14 15:31:21,873 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-12-14 15:31:21,873 INFO L300 CfgBuilder]: Removed 3 assume(true) statements. [2022-12-14 15:31:21,876 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 03:31:21 BoogieIcfgContainer [2022-12-14 15:31:21,876 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-12-14 15:31:21,879 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-12-14 15:31:21,879 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-12-14 15:31:21,882 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-12-14 15:31:21,882 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.12 03:31:21" (1/3) ... [2022-12-14 15:31:21,883 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@49b12d51 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 03:31:21, skipping insertion in model container [2022-12-14 15:31:21,883 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:31:21" (2/3) ... [2022-12-14 15:31:21,884 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@49b12d51 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 03:31:21, skipping insertion in model container [2022-12-14 15:31:21,884 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 03:31:21" (3/3) ... [2022-12-14 15:31:21,885 INFO L112 eAbstractionObserver]: Analyzing ICFG invert_string-1.c [2022-12-14 15:31:21,904 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-12-14 15:31:21,904 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-12-14 15:31:21,953 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-12-14 15:31:21,960 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;@ccf1362, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-12-14 15:31:21,960 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-12-14 15:31:21,963 INFO L276 IsEmpty]: Start isEmpty. Operand has 9 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 8 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:31:21,968 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-12-14 15:31:21,968 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:31:21,969 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-12-14 15:31:21,969 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:31:21,973 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:31:21,973 INFO L85 PathProgramCache]: Analyzing trace with hash -1214562904, now seen corresponding path program 1 times [2022-12-14 15:31:21,982 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:31:21,982 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1128415074] [2022-12-14 15:31:21,982 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:31:21,983 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:31:22,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:31:22,159 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 15:31:22,160 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:31:22,160 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1128415074] [2022-12-14 15:31:22,161 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1128415074] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 15:31:22,161 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 15:31:22,161 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-12-14 15:31:22,162 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [242661795] [2022-12-14 15:31:22,163 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 15:31:22,166 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-12-14 15:31:22,166 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:31:22,190 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-12-14 15:31:22,191 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 15:31:22,193 INFO L87 Difference]: Start difference. First operand has 9 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 8 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:31:22,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:31:22,227 INFO L93 Difference]: Finished difference Result 17 states and 23 transitions. [2022-12-14 15:31:22,228 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-12-14 15:31:22,229 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2022-12-14 15:31:22,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:31:22,234 INFO L225 Difference]: With dead ends: 17 [2022-12-14 15:31:22,234 INFO L226 Difference]: Without dead ends: 9 [2022-12-14 15:31:22,236 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 15:31:22,239 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 0 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 7 SdHoareTripleChecker+Invalid, 14 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 15:31:22,239 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 7 Invalid, 14 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 15:31:22,251 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2022-12-14 15:31:22,259 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2022-12-14 15:31:22,260 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9 states, 8 states have (on average 1.375) internal successors, (11), 8 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:31:22,260 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 11 transitions. [2022-12-14 15:31:22,261 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 11 transitions. Word has length 6 [2022-12-14 15:31:22,261 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:31:22,261 INFO L495 AbstractCegarLoop]: Abstraction has 9 states and 11 transitions. [2022-12-14 15:31:22,262 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:31:22,262 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 11 transitions. [2022-12-14 15:31:22,262 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-12-14 15:31:22,262 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:31:22,262 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:31:22,262 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-12-14 15:31:22,263 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:31:22,263 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:31:22,263 INFO L85 PathProgramCache]: Analyzing trace with hash 748360949, now seen corresponding path program 1 times [2022-12-14 15:31:22,263 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:31:22,264 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1411474749] [2022-12-14 15:31:22,264 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:31:22,264 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:31:22,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:31:22,331 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 15:31:22,331 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:31:22,331 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1411474749] [2022-12-14 15:31:22,331 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1411474749] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 15:31:22,332 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 15:31:22,332 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-12-14 15:31:22,332 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [725264167] [2022-12-14 15:31:22,332 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 15:31:22,333 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-12-14 15:31:22,333 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:31:22,334 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-12-14 15:31:22,334 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-12-14 15:31:22,334 INFO L87 Difference]: Start difference. First operand 9 states and 11 transitions. Second operand has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:31:22,361 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:31:22,362 INFO L93 Difference]: Finished difference Result 15 states and 18 transitions. [2022-12-14 15:31:22,362 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-12-14 15:31:22,362 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 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) Word has length 7 [2022-12-14 15:31:22,362 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:31:22,363 INFO L225 Difference]: With dead ends: 15 [2022-12-14 15:31:22,363 INFO L226 Difference]: Without dead ends: 10 [2022-12-14 15:31:22,363 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-12-14 15:31:22,364 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 13 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 8 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 3 SdHoareTripleChecker+Invalid, 12 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 8 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 15:31:22,364 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 3 Invalid, 12 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 8 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 15:31:22,365 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2022-12-14 15:31:22,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 10. [2022-12-14 15:31:22,367 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 9 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:31:22,367 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 12 transitions. [2022-12-14 15:31:22,367 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 12 transitions. Word has length 7 [2022-12-14 15:31:22,367 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:31:22,367 INFO L495 AbstractCegarLoop]: Abstraction has 10 states and 12 transitions. [2022-12-14 15:31:22,367 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:31:22,368 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 12 transitions. [2022-12-14 15:31:22,368 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-12-14 15:31:22,368 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:31:22,368 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:31:22,368 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-12-14 15:31:22,368 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:31:22,369 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:31:22,369 INFO L85 PathProgramCache]: Analyzing trace with hash 1720655960, now seen corresponding path program 1 times [2022-12-14 15:31:22,369 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:31:22,369 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1270566801] [2022-12-14 15:31:22,370 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:31:22,370 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:31:22,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:31:22,925 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 15:31:22,925 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:31:22,925 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1270566801] [2022-12-14 15:31:22,925 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1270566801] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:31:22,925 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [785040343] [2022-12-14 15:31:22,926 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:31:22,926 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:31:22,926 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6868c6-0041-4de4-8281-960c42c192df/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:31:22,927 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6868c6-0041-4de4-8281-960c42c192df/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:31:22,928 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6868c6-0041-4de4-8281-960c42c192df/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-12-14 15:31:22,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:31:22,982 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 36 conjunts are in the unsatisfiable core [2022-12-14 15:31:22,987 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:31:23,044 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-12-14 15:31:23,129 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 15 [2022-12-14 15:31:23,240 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 15:31:23,241 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 48 treesize of output 20 [2022-12-14 15:31:23,258 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 15:31:23,258 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:31:23,300 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 15:31:23,301 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 26 [2022-12-14 15:31:23,314 INFO L321 Elim1Store]: treesize reduction 5, result has 58.3 percent of original size [2022-12-14 15:31:23,315 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 23 [2022-12-14 15:31:23,324 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 18 [2022-12-14 15:31:23,450 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 15:31:23,450 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [785040343] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:31:23,451 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [49202877] [2022-12-14 15:31:23,470 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 15:31:23,470 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:31:23,474 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:31:23,479 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:31:23,480 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:31:23,522 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:31:23,525 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:31:23,571 INFO L321 Elim1Store]: treesize reduction 98, result has 24.6 percent of original size [2022-12-14 15:31:23,572 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 9 case distinctions, treesize of input 44 treesize of output 69 [2022-12-14 15:31:23,588 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:31:23,589 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:31:23,591 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 12 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 39 [2022-12-14 15:31:23,631 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:31:23,632 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 6 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-12-14 15:31:23,741 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 15:31:23,781 INFO L321 Elim1Store]: treesize reduction 76, result has 25.5 percent of original size [2022-12-14 15:31:23,782 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 328 treesize of output 325 [2022-12-14 15:31:23,943 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 15:31:23,954 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 15:31:23,969 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 15:31:23,991 INFO L321 Elim1Store]: treesize reduction 59, result has 23.4 percent of original size [2022-12-14 15:31:23,991 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 29 treesize of output 31 [2022-12-14 15:31:24,057 INFO L321 Elim1Store]: treesize reduction 88, result has 30.2 percent of original size [2022-12-14 15:31:24,058 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 105 treesize of output 119 [2022-12-14 15:31:24,132 INFO L321 Elim1Store]: treesize reduction 33, result has 17.5 percent of original size [2022-12-14 15:31:24,133 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 18 [2022-12-14 15:31:24,147 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:31:24,412 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '159#(and (= |ULTIMATE.start_main_~i~0#1| 0) (= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~MAX~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_~cont~0#1| 0) (= |ULTIMATE.start_main_~#str2~0#1.offset| 0) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~MAX~0#1|) (<= 0 |ULTIMATE.start_main_~#str2~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#str1~0#1.base|) (+ |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~#str1~0#1.offset|)) |ULTIMATE.start_main_#t~mem11#1|) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~#str1~0#1.base|) (= |ULTIMATE.start_main_~#str1~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#str2~0#1.base|) (+ |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~#str2~0#1.offset|)) |ULTIMATE.start_main_#t~mem12#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_#t~mem12#1| |ULTIMATE.start_main_#t~mem11#1|) 1 0)) (= |#NULL.base| 0))' at error location [2022-12-14 15:31:24,413 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:31:24,413 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:31:24,413 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 17 [2022-12-14 15:31:24,413 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1680474639] [2022-12-14 15:31:24,413 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:31:24,414 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-12-14 15:31:24,414 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:31:24,414 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-12-14 15:31:24,424 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=427, Unknown=0, NotChecked=0, Total=506 [2022-12-14 15:31:24,424 INFO L87 Difference]: Start difference. First operand 10 states and 12 transitions. Second operand has 18 states, 18 states have (on average 1.1111111111111112) internal successors, (20), 17 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:31:24,743 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:31:24,743 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2022-12-14 15:31:24,743 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-12-14 15:31:24,743 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.1111111111111112) internal successors, (20), 17 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2022-12-14 15:31:24,743 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:31:24,744 INFO L225 Difference]: With dead ends: 27 [2022-12-14 15:31:24,744 INFO L226 Difference]: Without dead ends: 16 [2022-12-14 15:31:24,745 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 7 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=169, Invalid=761, Unknown=0, NotChecked=0, Total=930 [2022-12-14 15:31:24,746 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 36 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 105 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 126 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 105 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 15:31:24,747 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [36 Valid, 33 Invalid, 126 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 105 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 15:31:24,747 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2022-12-14 15:31:24,750 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 11. [2022-12-14 15:31:24,750 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11 states, 10 states have (on average 1.3) internal successors, (13), 10 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) [2022-12-14 15:31:24,750 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 13 transitions. [2022-12-14 15:31:24,751 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 13 transitions. Word has length 8 [2022-12-14 15:31:24,751 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:31:24,751 INFO L495 AbstractCegarLoop]: Abstraction has 11 states and 13 transitions. [2022-12-14 15:31:24,751 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 1.1111111111111112) internal successors, (20), 17 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:31:24,751 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 13 transitions. [2022-12-14 15:31:24,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-12-14 15:31:24,751 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:31:24,751 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:31:24,757 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6868c6-0041-4de4-8281-960c42c192df/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-12-14 15:31:24,952 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6868c6-0041-4de4-8281-960c42c192df/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2022-12-14 15:31:24,953 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:31:24,954 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:31:24,955 INFO L85 PathProgramCache]: Analyzing trace with hash -1695131547, now seen corresponding path program 2 times [2022-12-14 15:31:24,955 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:31:24,956 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1701291906] [2022-12-14 15:31:24,956 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:31:24,956 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:31:25,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:31:25,113 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 15:31:25,113 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:31:25,113 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1701291906] [2022-12-14 15:31:25,113 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1701291906] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:31:25,114 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [413650422] [2022-12-14 15:31:25,114 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 15:31:25,114 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:31:25,114 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6868c6-0041-4de4-8281-960c42c192df/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:31:25,115 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6868c6-0041-4de4-8281-960c42c192df/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:31:25,116 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6868c6-0041-4de4-8281-960c42c192df/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-12-14 15:31:25,169 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-12-14 15:31:25,169 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:31:25,170 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 6 conjunts are in the unsatisfiable core [2022-12-14 15:31:25,171 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:31:25,182 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 15:31:25,182 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:31:25,202 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 15:31:25,202 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [413650422] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:31:25,202 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [774586314] [2022-12-14 15:31:25,205 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 15:31:25,205 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:31:25,205 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:31:25,205 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:31:25,205 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:31:25,223 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:31:25,226 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:31:25,269 INFO L321 Elim1Store]: treesize reduction 98, result has 24.6 percent of original size [2022-12-14 15:31:25,269 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 9 case distinctions, treesize of input 44 treesize of output 69 [2022-12-14 15:31:25,281 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:31:25,282 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:31:25,283 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 12 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 39 [2022-12-14 15:31:25,312 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:31:25,313 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 6 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-12-14 15:31:25,412 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 15:31:25,445 INFO L321 Elim1Store]: treesize reduction 76, result has 25.5 percent of original size [2022-12-14 15:31:25,445 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 328 treesize of output 325 [2022-12-14 15:31:25,594 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 15:31:25,604 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 15:31:25,630 INFO L321 Elim1Store]: treesize reduction 59, result has 23.4 percent of original size [2022-12-14 15:31:25,630 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 26 treesize of output 28 [2022-12-14 15:31:25,661 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 15:31:25,704 INFO L321 Elim1Store]: treesize reduction 83, result has 40.7 percent of original size [2022-12-14 15:31:25,705 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 102 treesize of output 128 [2022-12-14 15:31:25,791 INFO L321 Elim1Store]: treesize reduction 33, result has 17.5 percent of original size [2022-12-14 15:31:25,792 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 18 [2022-12-14 15:31:25,807 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:31:26,005 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '295#(and (= |ULTIMATE.start_main_~i~0#1| 0) (= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~MAX~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_~cont~0#1| 0) (= |ULTIMATE.start_main_~#str2~0#1.offset| 0) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~MAX~0#1|) (<= 0 |ULTIMATE.start_main_~#str2~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#str1~0#1.base|) (+ |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~#str1~0#1.offset|)) |ULTIMATE.start_main_#t~mem11#1|) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~#str1~0#1.base|) (= |ULTIMATE.start_main_~#str1~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#str2~0#1.base|) (+ |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~#str2~0#1.offset|)) |ULTIMATE.start_main_#t~mem12#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_#t~mem12#1| |ULTIMATE.start_main_#t~mem11#1|) 1 0)) (= |#NULL.base| 0))' at error location [2022-12-14 15:31:26,006 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:31:26,006 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:31:26,006 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4, 4] total 5 [2022-12-14 15:31:26,006 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [530984838] [2022-12-14 15:31:26,006 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:31:26,007 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-12-14 15:31:26,007 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:31:26,007 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-12-14 15:31:26,008 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2022-12-14 15:31:26,008 INFO L87 Difference]: Start difference. First operand 11 states and 13 transitions. Second operand has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:31:26,054 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:31:26,054 INFO L93 Difference]: Finished difference Result 22 states and 25 transitions. [2022-12-14 15:31:26,054 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-12-14 15:31:26,054 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 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) Word has length 9 [2022-12-14 15:31:26,054 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:31:26,055 INFO L225 Difference]: With dead ends: 22 [2022-12-14 15:31:26,055 INFO L226 Difference]: Without dead ends: 17 [2022-12-14 15:31:26,055 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 18 SyntacticMatches, 4 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=52, Invalid=130, Unknown=0, NotChecked=0, Total=182 [2022-12-14 15:31:26,056 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 23 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 29 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 26 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 15:31:26,056 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [23 Valid, 12 Invalid, 29 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 26 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 15:31:26,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2022-12-14 15:31:26,059 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 12. [2022-12-14 15:31:26,060 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 11 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:31:26,060 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 14 transitions. [2022-12-14 15:31:26,060 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 14 transitions. Word has length 9 [2022-12-14 15:31:26,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:31:26,061 INFO L495 AbstractCegarLoop]: Abstraction has 12 states and 14 transitions. [2022-12-14 15:31:26,061 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:31:26,061 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 14 transitions. [2022-12-14 15:31:26,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-12-14 15:31:26,061 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:31:26,062 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1] [2022-12-14 15:31:26,066 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6868c6-0041-4de4-8281-960c42c192df/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2022-12-14 15:31:26,262 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6868c6-0041-4de4-8281-960c42c192df/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:31:26,264 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:31:26,265 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:31:26,265 INFO L85 PathProgramCache]: Analyzing trace with hash -1013167384, now seen corresponding path program 3 times [2022-12-14 15:31:26,266 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:31:26,266 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [454226010] [2022-12-14 15:31:26,266 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:31:26,267 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:31:26,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:31:26,700 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 15:31:26,700 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:31:26,700 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [454226010] [2022-12-14 15:31:26,700 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [454226010] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:31:26,700 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1793928969] [2022-12-14 15:31:26,700 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 15:31:26,700 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:31:26,700 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6868c6-0041-4de4-8281-960c42c192df/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:31:26,701 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6868c6-0041-4de4-8281-960c42c192df/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:31:26,702 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6868c6-0041-4de4-8281-960c42c192df/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-12-14 15:31:26,737 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 15:31:26,737 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:31:26,738 WARN L261 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 30 conjunts are in the unsatisfiable core [2022-12-14 15:31:26,740 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:31:26,760 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-12-14 15:31:26,788 INFO L321 Elim1Store]: treesize reduction 29, result has 19.4 percent of original size [2022-12-14 15:31:26,788 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 17 [2022-12-14 15:31:26,857 INFO L321 Elim1Store]: treesize reduction 34, result has 8.1 percent of original size [2022-12-14 15:31:26,857 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 50 treesize of output 23 [2022-12-14 15:31:26,873 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-12-14 15:31:26,873 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:31:27,642 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 128 treesize of output 108 [2022-12-14 15:31:27,650 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 15:31:27,650 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 169 treesize of output 148 [2022-12-14 15:31:27,765 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-12-14 15:31:27,766 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1793928969] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:31:27,766 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1514831850] [2022-12-14 15:31:27,767 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 15:31:27,768 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:31:27,768 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:31:27,768 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:31:27,768 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:31:27,784 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:31:27,785 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:31:27,830 INFO L321 Elim1Store]: treesize reduction 70, result has 31.4 percent of original size [2022-12-14 15:31:27,831 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 29 treesize of output 53 [2022-12-14 15:31:27,847 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:31:27,850 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:31:27,897 INFO L321 Elim1Store]: treesize reduction 98, result has 24.6 percent of original size [2022-12-14 15:31:27,897 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 9 case distinctions, treesize of input 44 treesize of output 69 [2022-12-14 15:31:27,930 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:31:27,931 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 6 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-12-14 15:31:28,017 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 15:31:28,054 INFO L321 Elim1Store]: treesize reduction 76, result has 25.5 percent of original size [2022-12-14 15:31:28,055 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 328 treesize of output 325 [2022-12-14 15:31:28,204 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 15:31:28,214 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 15:31:28,246 INFO L321 Elim1Store]: treesize reduction 59, result has 23.4 percent of original size [2022-12-14 15:31:28,246 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 26 treesize of output 28 [2022-12-14 15:31:28,275 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 15:31:28,329 INFO L321 Elim1Store]: treesize reduction 75, result has 46.4 percent of original size [2022-12-14 15:31:28,330 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 102 treesize of output 136 [2022-12-14 15:31:28,489 INFO L321 Elim1Store]: treesize reduction 33, result has 17.5 percent of original size [2022-12-14 15:31:28,489 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 18 [2022-12-14 15:31:28,500 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:31:28,794 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '433#(and (= |ULTIMATE.start_main_~i~0#1| 0) (= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~MAX~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_~cont~0#1| 0) (= |ULTIMATE.start_main_~#str2~0#1.offset| 0) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~MAX~0#1|) (<= 0 |ULTIMATE.start_main_~#str2~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#str1~0#1.base|) (+ |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~#str1~0#1.offset|)) |ULTIMATE.start_main_#t~mem11#1|) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~#str1~0#1.base|) (= |ULTIMATE.start_main_~#str1~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#str2~0#1.base|) (+ |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~#str2~0#1.offset|)) |ULTIMATE.start_main_#t~mem12#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_#t~mem12#1| |ULTIMATE.start_main_#t~mem11#1|) 1 0)) (= |#NULL.base| 0))' at error location [2022-12-14 15:31:28,794 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:31:28,794 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:31:28,794 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7, 7] total 19 [2022-12-14 15:31:28,795 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2025650112] [2022-12-14 15:31:28,795 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:31:28,795 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-12-14 15:31:28,795 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:31:28,796 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-12-14 15:31:28,796 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=470, Unknown=0, NotChecked=0, Total=552 [2022-12-14 15:31:28,797 INFO L87 Difference]: Start difference. First operand 12 states and 14 transitions. Second operand has 19 states, 19 states have (on average 1.2105263157894737) internal successors, (23), 19 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:31:39,746 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:31:39,746 INFO L93 Difference]: Finished difference Result 69 states and 81 transitions. [2022-12-14 15:31:39,747 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-12-14 15:31:39,747 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.2105263157894737) internal successors, (23), 19 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2022-12-14 15:31:39,747 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:31:39,747 INFO L225 Difference]: With dead ends: 69 [2022-12-14 15:31:39,747 INFO L226 Difference]: Without dead ends: 67 [2022-12-14 15:31:39,748 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 534 ImplicationChecksByTransitivity, 11.9s TimeCoverageRelationStatistics Valid=507, Invalid=2355, Unknown=0, NotChecked=0, Total=2862 [2022-12-14 15:31:39,749 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 135 mSDsluCounter, 61 mSDsCounter, 0 mSdLazyCounter, 191 mSolverCounterSat, 73 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 135 SdHoareTripleChecker+Valid, 64 SdHoareTripleChecker+Invalid, 264 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 73 IncrementalHoareTripleChecker+Valid, 191 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 15:31:39,749 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [135 Valid, 64 Invalid, 264 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [73 Valid, 191 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 15:31:39,749 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2022-12-14 15:31:39,755 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 21. [2022-12-14 15:31:39,755 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 20 states have (on average 1.4) internal successors, (28), 20 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:31:39,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 28 transitions. [2022-12-14 15:31:39,756 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 28 transitions. Word has length 10 [2022-12-14 15:31:39,756 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:31:39,756 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 28 transitions. [2022-12-14 15:31:39,756 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.2105263157894737) internal successors, (23), 19 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:31:39,756 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 28 transitions. [2022-12-14 15:31:39,756 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-12-14 15:31:39,756 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:31:39,757 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:31:39,760 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6868c6-0041-4de4-8281-960c42c192df/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-12-14 15:31:39,957 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6868c6-0041-4de4-8281-960c42c192df/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:31:39,958 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:31:39,958 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:31:39,959 INFO L85 PathProgramCache]: Analyzing trace with hash 1765788379, now seen corresponding path program 1 times [2022-12-14 15:31:39,959 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:31:39,959 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1282458607] [2022-12-14 15:31:39,959 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:31:39,960 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:31:39,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-12-14 15:31:39,981 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-12-14 15:31:39,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-12-14 15:31:40,001 INFO L130 FreeRefinementEngine]: Strategy SIFA_TAIPAN found a feasible trace [2022-12-14 15:31:40,001 INFO L360 BasicCegarLoop]: Counterexample is feasible [2022-12-14 15:31:40,001 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2022-12-14 15:31:40,003 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2022-12-14 15:31:40,005 INFO L445 BasicCegarLoop]: Path program histogram: [3, 1, 1, 1] [2022-12-14 15:31:40,008 INFO L178 ceAbstractionStarter]: Computing trace abstraction results [2022-12-14 15:31:40,027 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 14.12 03:31:40 BoogieIcfgContainer [2022-12-14 15:31:40,027 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2022-12-14 15:31:40,028 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2022-12-14 15:31:40,028 INFO L271 PluginConnector]: Initializing Witness Printer... [2022-12-14 15:31:40,028 INFO L275 PluginConnector]: Witness Printer initialized [2022-12-14 15:31:40,029 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 03:31:21" (3/4) ... [2022-12-14 15:31:40,030 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2022-12-14 15:31:40,070 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6868c6-0041-4de4-8281-960c42c192df/bin/utaipan-gh47qXpMRh/witness.graphml [2022-12-14 15:31:40,071 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2022-12-14 15:31:40,071 INFO L158 Benchmark]: Toolchain (without parser) took 18757.77ms. Allocated memory was 138.4MB in the beginning and 213.9MB in the end (delta: 75.5MB). Free memory was 86.3MB in the beginning and 98.1MB in the end (delta: -11.8MB). Peak memory consumption was 65.3MB. Max. memory is 16.1GB. [2022-12-14 15:31:40,071 INFO L158 Benchmark]: CDTParser took 0.13ms. Allocated memory is still 138.4MB. Free memory is still 98.7MB. There was no memory consumed. Max. memory is 16.1GB. [2022-12-14 15:31:40,072 INFO L158 Benchmark]: CACSL2BoogieTranslator took 194.28ms. Allocated memory is still 138.4MB. Free memory was 86.0MB in the beginning and 75.5MB in the end (delta: 10.5MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. [2022-12-14 15:31:40,072 INFO L158 Benchmark]: Boogie Procedure Inliner took 33.06ms. Allocated memory is still 138.4MB. Free memory was 75.5MB in the beginning and 73.9MB in the end (delta: 1.6MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2022-12-14 15:31:40,072 INFO L158 Benchmark]: Boogie Preprocessor took 24.70ms. Allocated memory is still 138.4MB. Free memory was 73.9MB in the beginning and 72.5MB in the end (delta: 1.4MB). There was no memory consumed. Max. memory is 16.1GB. [2022-12-14 15:31:40,073 INFO L158 Benchmark]: RCFGBuilder took 307.32ms. Allocated memory is still 138.4MB. Free memory was 72.5MB in the beginning and 103.9MB in the end (delta: -31.4MB). Peak memory consumption was 12.9MB. Max. memory is 16.1GB. [2022-12-14 15:31:40,073 INFO L158 Benchmark]: TraceAbstraction took 18148.72ms. Allocated memory was 138.4MB in the beginning and 213.9MB in the end (delta: 75.5MB). Free memory was 103.4MB in the beginning and 100.2MB in the end (delta: 3.3MB). Peak memory consumption was 79.7MB. Max. memory is 16.1GB. [2022-12-14 15:31:40,073 INFO L158 Benchmark]: Witness Printer took 42.66ms. Allocated memory is still 213.9MB. Free memory was 100.2MB in the beginning and 98.1MB in the end (delta: 2.1MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2022-12-14 15:31:40,075 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.13ms. Allocated memory is still 138.4MB. Free memory is still 98.7MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 194.28ms. Allocated memory is still 138.4MB. Free memory was 86.0MB in the beginning and 75.5MB in the end (delta: 10.5MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 33.06ms. Allocated memory is still 138.4MB. Free memory was 75.5MB in the beginning and 73.9MB in the end (delta: 1.6MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Boogie Preprocessor took 24.70ms. Allocated memory is still 138.4MB. Free memory was 73.9MB in the beginning and 72.5MB in the end (delta: 1.4MB). There was no memory consumed. Max. memory is 16.1GB. * RCFGBuilder took 307.32ms. Allocated memory is still 138.4MB. Free memory was 72.5MB in the beginning and 103.9MB in the end (delta: -31.4MB). Peak memory consumption was 12.9MB. Max. memory is 16.1GB. * TraceAbstraction took 18148.72ms. Allocated memory was 138.4MB in the beginning and 213.9MB in the end (delta: 75.5MB). Free memory was 103.4MB in the beginning and 100.2MB in the end (delta: 3.3MB). Peak memory consumption was 79.7MB. Max. memory is 16.1GB. * Witness Printer took 42.66ms. Allocated memory is still 213.9MB. Free memory was 100.2MB in the beginning and 98.1MB in the end (delta: 2.1MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - CounterExampleResult [Line: 8]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L16] int MAX = __VERIFIER_nondet_uint(); [L17] COND FALSE !(!(MAX > 0)) [L18] char str1[MAX], str2[MAX]; [L19] int cont, i, j; [L20] cont = 0 [L22] i=0 VAL [cont=0, i=0, MAX=2, str1={4:0}, str2={5:0}] [L22] COND TRUE i= 0 [L30] EXPR str1[0] [L30] str2[j] = str1[0] [L31] j++ [L29] i-- VAL [cont=0, i=0, j=1, MAX=2, str1={4:0}, str2={5:0}] [L29] COND TRUE i >= 0 [L30] EXPR str1[0] [L30] str2[j] = str1[0] [L31] j++ [L29] i-- VAL [cont=0, i=-1, j=2, MAX=2, str1={4:0}, str2={5:0}] [L29] COND FALSE !(i >= 0) [L34] j = MAX-1 [L35] i=0 VAL [cont=0, i=0, j=1, MAX=2, str1={4:0}, str2={5:0}] [L35] COND TRUE i