./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-multidimensional/max-2-u.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 839c364b Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ff87c7-844c-4353-b76b-bb1246bd61b9/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ff87c7-844c-4353-b76b-bb1246bd61b9/bin/utaipan-eEHZpOm5b7/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ff87c7-844c-4353-b76b-bb1246bd61b9/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ff87c7-844c-4353-b76b-bb1246bd61b9/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-multidimensional/max-2-u.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ff87c7-844c-4353-b76b-bb1246bd61b9/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ff87c7-844c-4353-b76b-bb1246bd61b9/bin/utaipan-eEHZpOm5b7 --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 d56d1653edfb1a7b1c72e82d390b1b74d1df9114797a2f1426eb2285f6c4408f --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 20:12:21,383 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 20:12:21,386 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 20:12:21,425 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 20:12:21,425 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 20:12:21,427 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 20:12:21,429 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 20:12:21,433 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 20:12:21,436 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 20:12:21,438 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 20:12:21,440 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 20:12:21,442 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 20:12:21,443 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 20:12:21,444 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 20:12:21,447 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 20:12:21,449 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 20:12:21,450 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 20:12:21,452 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 20:12:21,455 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 20:12:21,459 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 20:12:21,462 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 20:12:21,475 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 20:12:21,477 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 20:12:21,479 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 20:12:21,484 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 20:12:21,485 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 20:12:21,486 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 20:12:21,487 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 20:12:21,488 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 20:12:21,490 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 20:12:21,490 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 20:12:21,492 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 20:12:21,493 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 20:12:21,494 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 20:12:21,496 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 20:12:21,497 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 20:12:21,498 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 20:12:21,498 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 20:12:21,499 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 20:12:21,501 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 20:12:21,502 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 20:12:21,503 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ff87c7-844c-4353-b76b-bb1246bd61b9/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-25 20:12:21,534 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 20:12:21,535 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 20:12:21,535 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 20:12:21,536 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 20:12:21,537 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 20:12:21,553 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 20:12:21,554 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 20:12:21,554 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 20:12:21,555 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 20:12:21,555 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 20:12:21,556 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 20:12:21,556 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 20:12:21,557 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 20:12:21,557 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 20:12:21,558 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 20:12:21,558 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 20:12:21,559 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 20:12:21,559 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 20:12:21,560 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 20:12:21,561 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 20:12:21,561 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 20:12:21,562 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 20:12:21,562 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 20:12:21,563 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 20:12:21,563 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 20:12:21,564 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 20:12:21,564 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 20:12:21,565 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 20:12:21,565 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 20:12:21,566 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 20:12:21,566 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 20:12:21,567 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 20:12:21,567 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 20:12:21,568 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 20:12:21,568 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 20:12:21,569 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 20:12:21,569 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 20:12:21,570 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 20:12:21,571 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 20:12:21,573 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 20:12:21,573 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 20:12:21,574 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES 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_82ff87c7-844c-4353-b76b-bb1246bd61b9/bin/utaipan-eEHZpOm5b7/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ff87c7-844c-4353-b76b-bb1246bd61b9/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> d56d1653edfb1a7b1c72e82d390b1b74d1df9114797a2f1426eb2285f6c4408f [2021-11-25 20:12:21,862 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 20:12:21,904 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 20:12:21,907 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 20:12:21,909 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 20:12:21,910 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 20:12:21,911 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ff87c7-844c-4353-b76b-bb1246bd61b9/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/array-multidimensional/max-2-u.c [2021-11-25 20:12:22,032 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ff87c7-844c-4353-b76b-bb1246bd61b9/bin/utaipan-eEHZpOm5b7/data/f88f45933/7c73634a6a1945a29aa95e1bb8478216/FLAG7ec4c3d44 [2021-11-25 20:12:22,605 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 20:12:22,605 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ff87c7-844c-4353-b76b-bb1246bd61b9/sv-benchmarks/c/array-multidimensional/max-2-u.c [2021-11-25 20:12:22,611 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ff87c7-844c-4353-b76b-bb1246bd61b9/bin/utaipan-eEHZpOm5b7/data/f88f45933/7c73634a6a1945a29aa95e1bb8478216/FLAG7ec4c3d44 [2021-11-25 20:12:22,978 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ff87c7-844c-4353-b76b-bb1246bd61b9/bin/utaipan-eEHZpOm5b7/data/f88f45933/7c73634a6a1945a29aa95e1bb8478216 [2021-11-25 20:12:22,982 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 20:12:22,984 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 20:12:22,986 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 20:12:22,987 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 20:12:22,991 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 20:12:22,992 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 08:12:22" (1/1) ... [2021-11-25 20:12:22,994 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@18cc1e48 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:12:22, skipping insertion in model container [2021-11-25 20:12:22,994 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 08:12:22" (1/1) ... [2021-11-25 20:12:23,008 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 20:12:23,026 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 20:12:23,212 WARN L230 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_82ff87c7-844c-4353-b76b-bb1246bd61b9/sv-benchmarks/c/array-multidimensional/max-2-u.c[319,332] [2021-11-25 20:12:23,251 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 20:12:23,270 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 20:12:23,298 WARN L230 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_82ff87c7-844c-4353-b76b-bb1246bd61b9/sv-benchmarks/c/array-multidimensional/max-2-u.c[319,332] [2021-11-25 20:12:23,326 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 20:12:23,345 INFO L208 MainTranslator]: Completed translation [2021-11-25 20:12:23,346 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:12:23 WrapperNode [2021-11-25 20:12:23,346 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 20:12:23,348 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 20:12:23,348 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 20:12:23,348 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 20:12:23,357 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:12:23" (1/1) ... [2021-11-25 20:12:23,367 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:12:23" (1/1) ... [2021-11-25 20:12:23,399 INFO L137 Inliner]: procedures = 14, calls = 16, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 83 [2021-11-25 20:12:23,400 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 20:12:23,402 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 20:12:23,403 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 20:12:23,403 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 20:12:23,413 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:12:23" (1/1) ... [2021-11-25 20:12:23,413 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:12:23" (1/1) ... [2021-11-25 20:12:23,427 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:12:23" (1/1) ... [2021-11-25 20:12:23,428 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:12:23" (1/1) ... [2021-11-25 20:12:23,439 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:12:23" (1/1) ... [2021-11-25 20:12:23,447 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:12:23" (1/1) ... [2021-11-25 20:12:23,455 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:12:23" (1/1) ... [2021-11-25 20:12:23,463 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 20:12:23,464 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 20:12:23,466 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 20:12:23,467 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 20:12:23,468 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:12:23" (1/1) ... [2021-11-25 20:12:23,477 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 20:12:23,490 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ff87c7-844c-4353-b76b-bb1246bd61b9/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:12:23,512 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ff87c7-844c-4353-b76b-bb1246bd61b9/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 20:12:23,543 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ff87c7-844c-4353-b76b-bb1246bd61b9/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 20:12:23,580 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 20:12:23,581 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 20:12:23,581 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-25 20:12:23,581 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-25 20:12:23,582 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 20:12:23,582 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 20:12:23,582 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-25 20:12:23,582 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-25 20:12:23,657 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 20:12:23,659 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 20:12:23,841 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 20:12:23,892 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 20:12:23,893 INFO L301 CfgBuilder]: Removed 6 assume(true) statements. [2021-11-25 20:12:23,896 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 08:12:23 BoogieIcfgContainer [2021-11-25 20:12:23,896 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 20:12:23,898 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 20:12:23,899 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 20:12:23,904 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 20:12:23,904 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 08:12:22" (1/3) ... [2021-11-25 20:12:23,905 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@bbfab24 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 08:12:23, skipping insertion in model container [2021-11-25 20:12:23,905 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:12:23" (2/3) ... [2021-11-25 20:12:23,906 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@bbfab24 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 08:12:23, skipping insertion in model container [2021-11-25 20:12:23,906 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 08:12:23" (3/3) ... [2021-11-25 20:12:23,908 INFO L111 eAbstractionObserver]: Analyzing ICFG max-2-u.c [2021-11-25 20:12:23,914 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 20:12:23,915 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-25 20:12:23,991 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 20:12:24,001 INFO L339 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, mLoopAccelerationTechnique=FAST_UPR [2021-11-25 20:12:24,005 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-25 20:12:24,039 INFO L276 IsEmpty]: Start isEmpty. Operand has 12 states, 10 states have (on average 1.8) internal successors, (18), 11 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:12:24,046 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-25 20:12:24,046 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:12:24,047 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:12:24,048 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:12:24,071 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:12:24,071 INFO L85 PathProgramCache]: Analyzing trace with hash 1954460599, now seen corresponding path program 1 times [2021-11-25 20:12:24,104 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:12:24,114 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1794695780] [2021-11-25 20:12:24,115 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:12:24,116 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:12:24,216 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 20:12:24,217 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1225576842] [2021-11-25 20:12:24,217 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:12:24,218 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:12:24,218 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ff87c7-844c-4353-b76b-bb1246bd61b9/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:12:24,220 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ff87c7-844c-4353-b76b-bb1246bd61b9/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:12:24,237 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ff87c7-844c-4353-b76b-bb1246bd61b9/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 20:12:24,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:12:24,302 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 20:12:24,313 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:12:24,475 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:12:24,475 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:12:24,476 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:12:24,476 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1794695780] [2021-11-25 20:12:24,476 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 20:12:24,477 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1225576842] [2021-11-25 20:12:24,478 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1225576842] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:12:24,478 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:12:24,478 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 20:12:24,481 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [329063706] [2021-11-25 20:12:24,482 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:12:24,487 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:12:24,488 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:12:24,522 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:12:24,523 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:12:24,526 INFO L87 Difference]: Start difference. First operand has 12 states, 10 states have (on average 1.8) internal successors, (18), 11 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 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) [2021-11-25 20:12:24,584 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:12:24,584 INFO L93 Difference]: Finished difference Result 23 states and 35 transitions. [2021-11-25 20:12:24,586 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:12:24,587 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 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 [2021-11-25 20:12:24,588 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:12:24,597 INFO L225 Difference]: With dead ends: 23 [2021-11-25 20:12:24,597 INFO L226 Difference]: Without dead ends: 13 [2021-11-25 20:12:24,601 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:12:24,606 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 2 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 22 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:12:24,608 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 11 Invalid, 22 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 20:12:24,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2021-11-25 20:12:24,648 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 12. [2021-11-25 20:12:24,649 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 11 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:12:24,650 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 17 transitions. [2021-11-25 20:12:24,651 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 17 transitions. Word has length 7 [2021-11-25 20:12:24,652 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:12:24,652 INFO L470 AbstractCegarLoop]: Abstraction has 12 states and 17 transitions. [2021-11-25 20:12:24,652 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 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) [2021-11-25 20:12:24,652 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 17 transitions. [2021-11-25 20:12:24,653 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-25 20:12:24,653 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:12:24,653 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:12:24,702 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ff87c7-844c-4353-b76b-bb1246bd61b9/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-25 20:12:24,870 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ff87c7-844c-4353-b76b-bb1246bd61b9/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2021-11-25 20:12:24,871 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:12:24,872 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:12:24,872 INFO L85 PathProgramCache]: Analyzing trace with hash -1712892417, now seen corresponding path program 1 times [2021-11-25 20:12:24,873 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:12:24,873 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1377582080] [2021-11-25 20:12:24,873 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:12:24,874 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:12:24,889 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 20:12:24,890 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [41193152] [2021-11-25 20:12:24,890 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:12:24,890 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:12:24,890 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ff87c7-844c-4353-b76b-bb1246bd61b9/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:12:24,908 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ff87c7-844c-4353-b76b-bb1246bd61b9/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:12:24,925 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ff87c7-844c-4353-b76b-bb1246bd61b9/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-25 20:12:25,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:12:25,017 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 20:12:25,018 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:12:25,104 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:12:25,104 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:12:25,105 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:12:25,107 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1377582080] [2021-11-25 20:12:25,107 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 20:12:25,107 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [41193152] [2021-11-25 20:12:25,108 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [41193152] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:12:25,108 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:12:25,108 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 20:12:25,109 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1200790582] [2021-11-25 20:12:25,109 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:12:25,110 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 20:12:25,110 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:12:25,111 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 20:12:25,111 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 20:12:25,111 INFO L87 Difference]: Start difference. First operand 12 states and 17 transitions. Second operand has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:12:25,204 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:12:25,205 INFO L93 Difference]: Finished difference Result 31 states and 45 transitions. [2021-11-25 20:12:25,206 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 20:12:25,206 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2021-11-25 20:12:25,206 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:12:25,207 INFO L225 Difference]: With dead ends: 31 [2021-11-25 20:12:25,207 INFO L226 Difference]: Without dead ends: 21 [2021-11-25 20:12:25,208 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 20:12:25,210 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 16 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 7 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:12:25,211 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 7 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:12:25,212 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-11-25 20:12:25,218 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 15. [2021-11-25 20:12:25,221 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 14 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) [2021-11-25 20:12:25,222 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 20 transitions. [2021-11-25 20:12:25,222 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 20 transitions. Word has length 9 [2021-11-25 20:12:25,223 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:12:25,223 INFO L470 AbstractCegarLoop]: Abstraction has 15 states and 20 transitions. [2021-11-25 20:12:25,223 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:12:25,223 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 20 transitions. [2021-11-25 20:12:25,224 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-25 20:12:25,224 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:12:25,224 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:12:25,250 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ff87c7-844c-4353-b76b-bb1246bd61b9/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-25 20:12:25,433 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ff87c7-844c-4353-b76b-bb1246bd61b9/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:12:25,433 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:12:25,434 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:12:25,435 INFO L85 PathProgramCache]: Analyzing trace with hash -496907627, now seen corresponding path program 1 times [2021-11-25 20:12:25,435 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:12:25,435 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [254893727] [2021-11-25 20:12:25,435 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:12:25,436 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:12:25,448 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 20:12:25,449 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1013119168] [2021-11-25 20:12:25,449 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:12:25,449 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:12:25,449 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ff87c7-844c-4353-b76b-bb1246bd61b9/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:12:25,467 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ff87c7-844c-4353-b76b-bb1246bd61b9/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:12:25,481 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ff87c7-844c-4353-b76b-bb1246bd61b9/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-25 20:12:25,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:12:25,599 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-25 20:12:25,601 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:12:25,734 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:12:25,735 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:12:25,814 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:12:25,814 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:12:25,815 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [254893727] [2021-11-25 20:12:25,815 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 20:12:25,815 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1013119168] [2021-11-25 20:12:25,815 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1013119168] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:12:25,818 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [692183084] [2021-11-25 20:12:25,852 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-25 20:12:25,857 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:12:25,863 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:12:25,870 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:12:25,870 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:12:26,006 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:12:26,052 INFO L354 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2021-11-25 20:12:26,053 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2021-11-25 20:12:26,098 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:12:26,135 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:12:26,138 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:12:26,285 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:12:26,288 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 34 [2021-11-25 20:12:26,768 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:12:26,770 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:12:26,817 INFO L354 Elim1Store]: treesize reduction 100, result has 21.3 percent of original size [2021-11-25 20:12:26,818 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 265 treesize of output 258 [2021-11-25 20:12:27,130 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 21 treesize of output 17 [2021-11-25 20:12:27,223 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 21 treesize of output 17 [2021-11-25 20:12:27,517 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:12:27,940 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [692183084] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:12:27,941 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-25 20:12:27,941 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4, 4] total 10 [2021-11-25 20:12:27,942 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [290389567] [2021-11-25 20:12:27,942 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:12:27,942 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 20:12:27,942 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:12:27,943 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 20:12:27,943 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=68, Unknown=0, NotChecked=0, Total=110 [2021-11-25 20:12:27,943 INFO L87 Difference]: Start difference. First operand 15 states and 20 transitions. Second operand has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:12:28,049 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:12:28,049 INFO L93 Difference]: Finished difference Result 25 states and 32 transitions. [2021-11-25 20:12:28,049 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 20:12:28,050 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2021-11-25 20:12:28,050 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:12:28,050 INFO L225 Difference]: With dead ends: 25 [2021-11-25 20:12:28,050 INFO L226 Difference]: Without dead ends: 18 [2021-11-25 20:12:28,051 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=42, Invalid=68, Unknown=0, NotChecked=0, Total=110 [2021-11-25 20:12:28,053 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 4 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 54 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:12:28,054 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4 Valid, 9 Invalid, 54 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:12:28,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-11-25 20:12:28,062 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 16. [2021-11-25 20:12:28,063 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.4) internal successors, (21), 15 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:12:28,063 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 21 transitions. [2021-11-25 20:12:28,064 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 21 transitions. Word has length 10 [2021-11-25 20:12:28,064 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:12:28,064 INFO L470 AbstractCegarLoop]: Abstraction has 16 states and 21 transitions. [2021-11-25 20:12:28,064 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:12:28,065 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 21 transitions. [2021-11-25 20:12:28,065 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-25 20:12:28,066 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:12:28,066 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:12:28,113 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ff87c7-844c-4353-b76b-bb1246bd61b9/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-25 20:12:28,288 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ff87c7-844c-4353-b76b-bb1246bd61b9/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:12:28,289 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:12:28,289 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:12:28,289 INFO L85 PathProgramCache]: Analyzing trace with hash -1125446304, now seen corresponding path program 1 times [2021-11-25 20:12:28,289 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:12:28,290 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1465900382] [2021-11-25 20:12:28,290 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:12:28,290 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:12:28,298 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 20:12:28,299 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1880525898] [2021-11-25 20:12:28,299 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:12:28,299 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:12:28,300 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ff87c7-844c-4353-b76b-bb1246bd61b9/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:12:28,301 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ff87c7-844c-4353-b76b-bb1246bd61b9/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:12:28,308 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ff87c7-844c-4353-b76b-bb1246bd61b9/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-25 20:12:28,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:12:28,372 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-25 20:12:28,374 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:12:28,429 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:12:28,430 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:12:28,483 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:12:28,484 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:12:28,484 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1465900382] [2021-11-25 20:12:28,484 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 20:12:28,485 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1880525898] [2021-11-25 20:12:28,485 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1880525898] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:12:28,485 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [828996735] [2021-11-25 20:12:28,491 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 20:12:28,492 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:12:28,492 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:12:28,492 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:12:28,504 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:12:28,533 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:12:28,566 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:12:28,567 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:12:28,583 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:12:28,585 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 0 case distinctions, treesize of input 26 treesize of output 34 [2021-11-25 20:12:28,652 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:12:28,654 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 34 [2021-11-25 20:12:28,883 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:12:28,885 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:12:28,927 INFO L354 Elim1Store]: treesize reduction 100, result has 21.3 percent of original size [2021-11-25 20:12:28,928 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 265 treesize of output 258 [2021-11-25 20:12:29,207 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 21 treesize of output 17 [2021-11-25 20:12:29,287 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 21 treesize of output 17 [2021-11-25 20:12:29,810 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:12:30,204 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '415#(and (= |ULTIMATE.start_main_~i~0#1| 0) (= |ULTIMATE.start_main_~m~0#1| 1000) (<= 0 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#A~0#1.base|) (+ |ULTIMATE.start_main_~#A~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| (* |ULTIMATE.start_main_~n~0#1| 4)) (* |ULTIMATE.start_main_~j~0#1| 4))) |ULTIMATE.start_main_#t~mem8#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= |ULTIMATE.start_main_#t~mem8#1| |ULTIMATE.start_main_~max~0#1|) 1 0)) (= |ULTIMATE.start_main_~#A~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_~j~0#1| 0) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~n~0#1| 1500) (= |#NULL.base| 0))' at error location [2021-11-25 20:12:30,205 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:12:30,205 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 20:12:30,205 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 7 [2021-11-25 20:12:30,205 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1692881855] [2021-11-25 20:12:30,205 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 20:12:30,206 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-25 20:12:30,206 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:12:30,207 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-25 20:12:30,207 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=90, Unknown=0, NotChecked=0, Total=156 [2021-11-25 20:12:30,207 INFO L87 Difference]: Start difference. First operand 16 states and 21 transitions. Second operand has 8 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:12:30,373 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:12:30,374 INFO L93 Difference]: Finished difference Result 52 states and 71 transitions. [2021-11-25 20:12:30,374 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-25 20:12:30,375 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2021-11-25 20:12:30,375 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:12:30,379 INFO L225 Difference]: With dead ends: 52 [2021-11-25 20:12:30,379 INFO L226 Difference]: Without dead ends: 38 [2021-11-25 20:12:30,381 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 21 SyntacticMatches, 5 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 99 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=88, Invalid=122, Unknown=0, NotChecked=0, Total=210 [2021-11-25 20:12:30,385 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 76 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 63 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 76 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 93 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 63 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:12:30,389 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [76 Valid, 13 Invalid, 93 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [63 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:12:30,393 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-11-25 20:12:30,406 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 31. [2021-11-25 20:12:30,407 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 30 states have (on average 1.3) internal successors, (39), 30 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:12:30,410 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 39 transitions. [2021-11-25 20:12:30,411 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 39 transitions. Word has length 13 [2021-11-25 20:12:30,411 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:12:30,411 INFO L470 AbstractCegarLoop]: Abstraction has 31 states and 39 transitions. [2021-11-25 20:12:30,411 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:12:30,412 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 39 transitions. [2021-11-25 20:12:30,413 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-25 20:12:30,413 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:12:30,413 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:12:30,461 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ff87c7-844c-4353-b76b-bb1246bd61b9/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-25 20:12:30,641 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ff87c7-844c-4353-b76b-bb1246bd61b9/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:12:30,642 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:12:30,642 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:12:30,642 INFO L85 PathProgramCache]: Analyzing trace with hash 311535379, now seen corresponding path program 2 times [2021-11-25 20:12:30,642 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:12:30,642 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2011878179] [2021-11-25 20:12:30,643 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:12:30,643 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:12:30,651 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 20:12:30,651 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1997724678] [2021-11-25 20:12:30,652 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:12:30,652 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:12:30,652 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ff87c7-844c-4353-b76b-bb1246bd61b9/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:12:30,665 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ff87c7-844c-4353-b76b-bb1246bd61b9/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:12:30,683 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ff87c7-844c-4353-b76b-bb1246bd61b9/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-25 20:12:30,739 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-25 20:12:30,739 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:12:30,740 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-25 20:12:30,742 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:12:30,829 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-25 20:12:30,829 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:12:30,897 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-25 20:12:30,897 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:12:30,897 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2011878179] [2021-11-25 20:12:30,897 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 20:12:30,898 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1997724678] [2021-11-25 20:12:30,898 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1997724678] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:12:30,898 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [472302212] [2021-11-25 20:12:30,901 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 20:12:30,902 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:12:30,902 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:12:30,902 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:12:30,903 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:12:30,925 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:12:30,957 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:12:30,958 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:12:30,974 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:12:30,976 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 0 case distinctions, treesize of input 26 treesize of output 34 [2021-11-25 20:12:31,045 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:12:31,047 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 38 [2021-11-25 20:12:31,281 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:12:31,285 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:12:31,288 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:12:31,309 INFO L354 Elim1Store]: treesize reduction 67, result has 9.5 percent of original size [2021-11-25 20:12:31,310 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 273 treesize of output 256 [2021-11-25 20:12:31,422 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 21 treesize of output 17 [2021-11-25 20:12:31,470 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 21 treesize of output 17 [2021-11-25 20:12:31,897 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:12:32,557 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '681#(and (= |ULTIMATE.start_main_~i~0#1| 0) (= |ULTIMATE.start_main_~m~0#1| 1000) (<= 0 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#A~0#1.base|) (+ |ULTIMATE.start_main_~#A~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| (* |ULTIMATE.start_main_~n~0#1| 4)) (* |ULTIMATE.start_main_~j~0#1| 4))) |ULTIMATE.start_main_#t~mem8#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= |ULTIMATE.start_main_#t~mem8#1| |ULTIMATE.start_main_~max~0#1|) 1 0)) (= |ULTIMATE.start_main_~#A~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_~j~0#1| 0) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~n~0#1| 1500) (= |#NULL.base| 0))' at error location [2021-11-25 20:12:32,557 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:12:32,557 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 20:12:32,557 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3] total 5 [2021-11-25 20:12:32,558 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2038480691] [2021-11-25 20:12:32,558 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 20:12:32,558 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 20:12:32,558 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:12:32,559 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 20:12:32,559 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=82, Unknown=0, NotChecked=0, Total=132 [2021-11-25 20:12:32,559 INFO L87 Difference]: Start difference. First operand 31 states and 39 transitions. Second operand has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:12:32,645 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:12:32,646 INFO L93 Difference]: Finished difference Result 72 states and 92 transitions. [2021-11-25 20:12:32,647 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 20:12:32,647 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2021-11-25 20:12:32,648 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:12:32,651 INFO L225 Difference]: With dead ends: 72 [2021-11-25 20:12:32,651 INFO L226 Difference]: Without dead ends: 49 [2021-11-25 20:12:32,652 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 42 SyntacticMatches, 3 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=50, Invalid=82, Unknown=0, NotChecked=0, Total=132 [2021-11-25 20:12:32,655 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 8 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 47 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:12:32,656 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 19 Invalid, 47 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:12:32,657 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-11-25 20:12:32,680 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2021-11-25 20:12:32,680 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 48 states have (on average 1.25) internal successors, (60), 48 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:12:32,683 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 60 transitions. [2021-11-25 20:12:32,683 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 60 transitions. Word has length 19 [2021-11-25 20:12:32,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:12:32,684 INFO L470 AbstractCegarLoop]: Abstraction has 49 states and 60 transitions. [2021-11-25 20:12:32,684 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:12:32,684 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 60 transitions. [2021-11-25 20:12:32,686 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-11-25 20:12:32,686 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:12:32,686 INFO L514 BasicCegarLoop]: trace histogram [16, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:12:32,733 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ff87c7-844c-4353-b76b-bb1246bd61b9/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-25 20:12:32,907 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ff87c7-844c-4353-b76b-bb1246bd61b9/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:12:32,907 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:12:32,907 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:12:32,907 INFO L85 PathProgramCache]: Analyzing trace with hash 236210283, now seen corresponding path program 3 times [2021-11-25 20:12:32,908 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:12:32,908 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1217752406] [2021-11-25 20:12:32,908 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:12:32,908 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:12:32,922 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 20:12:32,923 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1211324306] [2021-11-25 20:12:32,923 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:12:32,923 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:12:32,924 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ff87c7-844c-4353-b76b-bb1246bd61b9/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:12:32,925 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ff87c7-844c-4353-b76b-bb1246bd61b9/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:12:32,957 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ff87c7-844c-4353-b76b-bb1246bd61b9/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-25 20:12:33,008 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:12:33,008 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:12:33,009 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 20:12:33,012 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:12:33,147 INFO L134 CoverageAnalysis]: Checked inductivity of 211 backedges. 6 proven. 5 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2021-11-25 20:12:33,147 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:12:33,275 INFO L134 CoverageAnalysis]: Checked inductivity of 211 backedges. 6 proven. 5 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2021-11-25 20:12:33,275 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:12:33,275 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1217752406] [2021-11-25 20:12:33,276 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 20:12:33,276 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1211324306] [2021-11-25 20:12:33,276 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1211324306] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:12:33,276 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2026621288] [2021-11-25 20:12:33,279 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 20:12:33,280 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:12:33,280 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:12:33,280 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:12:33,281 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:12:33,317 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:12:33,341 INFO L354 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2021-11-25 20:12:33,341 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2021-11-25 20:12:33,359 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:12:33,392 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:12:33,392 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:12:33,463 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:12:33,464 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 34 [2021-11-25 20:12:33,644 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:12:33,646 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:12:33,684 INFO L354 Elim1Store]: treesize reduction 100, result has 21.3 percent of original size [2021-11-25 20:12:33,685 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 265 treesize of output 258 [2021-11-25 20:12:33,810 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 21 treesize of output 17 [2021-11-25 20:12:33,858 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 21 treesize of output 17 [2021-11-25 20:12:34,440 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:12:35,015 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1141#(and (= |ULTIMATE.start_main_~i~0#1| 0) (= |ULTIMATE.start_main_~m~0#1| 1000) (<= 0 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#A~0#1.base|) (+ |ULTIMATE.start_main_~#A~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| (* |ULTIMATE.start_main_~n~0#1| 4)) (* |ULTIMATE.start_main_~j~0#1| 4))) |ULTIMATE.start_main_#t~mem8#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= |ULTIMATE.start_main_#t~mem8#1| |ULTIMATE.start_main_~max~0#1|) 1 0)) (= |ULTIMATE.start_main_~#A~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_~j~0#1| 0) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~n~0#1| 1500) (= |#NULL.base| 0))' at error location [2021-11-25 20:12:35,015 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:12:35,015 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 20:12:35,016 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 16 [2021-11-25 20:12:35,016 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1686623141] [2021-11-25 20:12:35,016 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 20:12:35,017 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-25 20:12:35,017 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:12:35,017 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-25 20:12:35,018 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=127, Invalid=335, Unknown=0, NotChecked=0, Total=462 [2021-11-25 20:12:35,018 INFO L87 Difference]: Start difference. First operand 49 states and 60 transitions. Second operand has 16 states, 16 states have (on average 1.5) internal successors, (24), 16 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:12:35,579 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:12:35,579 INFO L93 Difference]: Finished difference Result 154 states and 181 transitions. [2021-11-25 20:12:35,580 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-25 20:12:35,580 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.5) internal successors, (24), 16 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 37 [2021-11-25 20:12:35,580 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:12:35,586 INFO L225 Difference]: With dead ends: 154 [2021-11-25 20:12:35,587 INFO L226 Difference]: Without dead ends: 138 [2021-11-25 20:12:35,588 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 97 SyntacticMatches, 1 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 460 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=422, Invalid=1060, Unknown=0, NotChecked=0, Total=1482 [2021-11-25 20:12:35,590 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 89 mSDsluCounter, 61 mSDsCounter, 0 mSdLazyCounter, 167 mSolverCounterSat, 140 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 89 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 307 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 140 IncrementalHoareTripleChecker+Valid, 167 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:12:35,591 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [89 Valid, 73 Invalid, 307 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [140 Valid, 167 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 20:12:35,592 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2021-11-25 20:12:35,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 67. [2021-11-25 20:12:35,623 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 66 states have (on average 1.2272727272727273) internal successors, (81), 66 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:12:35,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 81 transitions. [2021-11-25 20:12:35,625 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 81 transitions. Word has length 37 [2021-11-25 20:12:35,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:12:35,626 INFO L470 AbstractCegarLoop]: Abstraction has 67 states and 81 transitions. [2021-11-25 20:12:35,626 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 1.5) internal successors, (24), 16 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:12:35,627 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 81 transitions. [2021-11-25 20:12:35,633 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-25 20:12:35,633 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:12:35,633 INFO L514 BasicCegarLoop]: trace histogram [16, 16, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:12:35,679 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ff87c7-844c-4353-b76b-bb1246bd61b9/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-25 20:12:35,857 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ff87c7-844c-4353-b76b-bb1246bd61b9/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-25 20:12:35,857 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:12:35,858 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:12:35,858 INFO L85 PathProgramCache]: Analyzing trace with hash 1997355815, now seen corresponding path program 4 times [2021-11-25 20:12:35,858 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:12:35,858 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [33353156] [2021-11-25 20:12:35,859 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:12:35,859 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:12:35,880 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 20:12:35,890 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1630725943] [2021-11-25 20:12:35,890 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:12:35,890 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:12:35,891 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ff87c7-844c-4353-b76b-bb1246bd61b9/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:12:35,892 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ff87c7-844c-4353-b76b-bb1246bd61b9/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:12:35,917 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ff87c7-844c-4353-b76b-bb1246bd61b9/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-25 20:12:36,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:12:36,034 INFO L263 TraceCheckSpWp]: Trace formula consists of 326 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-25 20:12:36,039 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:12:36,236 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 79 proven. 10 refuted. 0 times theorem prover too weak. 311 trivial. 0 not checked. [2021-11-25 20:12:36,236 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:12:36,414 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 79 proven. 10 refuted. 0 times theorem prover too weak. 311 trivial. 0 not checked. [2021-11-25 20:12:36,414 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:12:36,415 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [33353156] [2021-11-25 20:12:36,415 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 20:12:36,415 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1630725943] [2021-11-25 20:12:36,415 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1630725943] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:12:36,415 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1700750661] [2021-11-25 20:12:36,418 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 20:12:36,418 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:12:36,419 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:12:36,419 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:12:36,419 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:12:36,446 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:12:36,481 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:12:36,481 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:12:36,494 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:12:36,496 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 0 case distinctions, treesize of input 26 treesize of output 34 [2021-11-25 20:12:36,563 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:12:36,565 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 34 [2021-11-25 20:12:36,738 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:12:36,740 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:12:36,776 INFO L354 Elim1Store]: treesize reduction 100, result has 21.3 percent of original size [2021-11-25 20:12:36,777 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 265 treesize of output 258 [2021-11-25 20:12:36,898 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 21 treesize of output 17 [2021-11-25 20:12:36,933 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 21 treesize of output 17 [2021-11-25 20:12:37,454 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:12:38,057 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1916#(and (= |ULTIMATE.start_main_~i~0#1| 0) (= |ULTIMATE.start_main_~m~0#1| 1000) (<= 0 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#A~0#1.base|) (+ |ULTIMATE.start_main_~#A~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| (* |ULTIMATE.start_main_~n~0#1| 4)) (* |ULTIMATE.start_main_~j~0#1| 4))) |ULTIMATE.start_main_#t~mem8#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= |ULTIMATE.start_main_#t~mem8#1| |ULTIMATE.start_main_~max~0#1|) 1 0)) (= |ULTIMATE.start_main_~#A~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_~j~0#1| 0) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~n~0#1| 1500) (= |#NULL.base| 0))' at error location [2021-11-25 20:12:38,057 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:12:38,058 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 20:12:38,058 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 13 [2021-11-25 20:12:38,058 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [451952423] [2021-11-25 20:12:38,058 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 20:12:38,059 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-25 20:12:38,059 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:12:38,060 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-25 20:12:38,060 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=146, Invalid=234, Unknown=0, NotChecked=0, Total=380 [2021-11-25 20:12:38,060 INFO L87 Difference]: Start difference. First operand 67 states and 81 transitions. Second operand has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 13 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:12:38,369 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:12:38,370 INFO L93 Difference]: Finished difference Result 212 states and 290 transitions. [2021-11-25 20:12:38,370 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-25 20:12:38,371 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 13 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 55 [2021-11-25 20:12:38,371 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:12:38,372 INFO L225 Difference]: With dead ends: 212 [2021-11-25 20:12:38,372 INFO L226 Difference]: Without dead ends: 152 [2021-11-25 20:12:38,375 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 139 SyntacticMatches, 6 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 306 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=231, Invalid=369, Unknown=0, NotChecked=0, Total=600 [2021-11-25 20:12:38,376 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 152 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 57 mSolverCounterSat, 138 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 152 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 195 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 138 IncrementalHoareTripleChecker+Valid, 57 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:12:38,377 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [152 Valid, 31 Invalid, 195 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [138 Valid, 57 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:12:38,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2021-11-25 20:12:38,410 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 133. [2021-11-25 20:12:38,411 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 132 states have (on average 1.1590909090909092) internal successors, (153), 132 states have internal predecessors, (153), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:12:38,413 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 153 transitions. [2021-11-25 20:12:38,413 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 153 transitions. Word has length 55 [2021-11-25 20:12:38,413 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:12:38,413 INFO L470 AbstractCegarLoop]: Abstraction has 133 states and 153 transitions. [2021-11-25 20:12:38,414 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 13 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:12:38,414 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 153 transitions. [2021-11-25 20:12:38,416 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2021-11-25 20:12:38,416 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:12:38,416 INFO L514 BasicCegarLoop]: trace histogram [40, 40, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:12:38,463 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ff87c7-844c-4353-b76b-bb1246bd61b9/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-25 20:12:38,637 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ff87c7-844c-4353-b76b-bb1246bd61b9/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-11-25 20:12:38,638 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:12:38,638 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:12:38,638 INFO L85 PathProgramCache]: Analyzing trace with hash -975066457, now seen corresponding path program 5 times [2021-11-25 20:12:38,638 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:12:38,639 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [469768148] [2021-11-25 20:12:38,639 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:12:38,639 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:12:38,670 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 20:12:38,670 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1826744638] [2021-11-25 20:12:38,670 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:12:38,670 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:12:38,671 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ff87c7-844c-4353-b76b-bb1246bd61b9/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:12:38,672 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ff87c7-844c-4353-b76b-bb1246bd61b9/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:12:38,690 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ff87c7-844c-4353-b76b-bb1246bd61b9/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-25 20:12:40,291 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2021-11-25 20:12:40,291 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:12:40,298 INFO L263 TraceCheckSpWp]: Trace formula consists of 354 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-25 20:12:40,304 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:12:40,685 INFO L134 CoverageAnalysis]: Checked inductivity of 1912 backedges. 367 proven. 55 refuted. 0 times theorem prover too weak. 1490 trivial. 0 not checked. [2021-11-25 20:12:40,686 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:12:41,112 INFO L134 CoverageAnalysis]: Checked inductivity of 1912 backedges. 4 proven. 418 refuted. 0 times theorem prover too weak. 1490 trivial. 0 not checked. [2021-11-25 20:12:41,112 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:12:41,113 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [469768148] [2021-11-25 20:12:41,113 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 20:12:41,113 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1826744638] [2021-11-25 20:12:41,113 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1826744638] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:12:41,114 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [531119906] [2021-11-25 20:12:41,116 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 20:12:41,117 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:12:41,117 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:12:41,117 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:12:41,118 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:12:41,136 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:12:41,165 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:12:41,166 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:12:41,177 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:12:41,178 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 0 case distinctions, treesize of input 26 treesize of output 34 [2021-11-25 20:12:41,239 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:12:41,240 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 38 [2021-11-25 20:12:41,408 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:12:41,411 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:12:41,418 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:12:41,434 INFO L354 Elim1Store]: treesize reduction 67, result has 9.5 percent of original size [2021-11-25 20:12:41,435 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 273 treesize of output 256 [2021-11-25 20:12:41,523 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 21 treesize of output 17 [2021-11-25 20:12:41,568 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 21 treesize of output 17 [2021-11-25 20:12:42,081 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:12:42,537 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3210#(and (= |ULTIMATE.start_main_~i~0#1| 0) (= |ULTIMATE.start_main_~m~0#1| 1000) (<= 0 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#A~0#1.base|) (+ |ULTIMATE.start_main_~#A~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| (* |ULTIMATE.start_main_~n~0#1| 4)) (* |ULTIMATE.start_main_~j~0#1| 4))) |ULTIMATE.start_main_#t~mem8#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= |ULTIMATE.start_main_#t~mem8#1| |ULTIMATE.start_main_~max~0#1|) 1 0)) (= |ULTIMATE.start_main_~#A~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_~j~0#1| 0) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~n~0#1| 1500) (= |#NULL.base| 0))' at error location [2021-11-25 20:12:42,537 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:12:42,538 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 20:12:42,538 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 25 [2021-11-25 20:12:42,538 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1431715565] [2021-11-25 20:12:42,538 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 20:12:42,539 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-25 20:12:42,539 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:12:42,540 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-25 20:12:42,540 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=404, Invalid=588, Unknown=0, NotChecked=0, Total=992 [2021-11-25 20:12:42,541 INFO L87 Difference]: Start difference. First operand 133 states and 153 transitions. Second operand has 26 states, 26 states have (on average 1.5769230769230769) internal successors, (41), 25 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:12:43,170 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:12:43,170 INFO L93 Difference]: Finished difference Result 428 states and 566 transitions. [2021-11-25 20:12:43,171 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-25 20:12:43,171 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.5769230769230769) internal successors, (41), 25 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 103 [2021-11-25 20:12:43,171 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:12:43,173 INFO L225 Difference]: With dead ends: 428 [2021-11-25 20:12:43,174 INFO L226 Difference]: Without dead ends: 308 [2021-11-25 20:12:43,176 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 318 GetRequests, 276 SyntacticMatches, 1 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 612 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=723, Invalid=1083, Unknown=0, NotChecked=0, Total=1806 [2021-11-25 20:12:43,177 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 288 mSDsluCounter, 63 mSDsCounter, 0 mSdLazyCounter, 114 mSolverCounterSat, 196 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 288 SdHoareTripleChecker+Valid, 67 SdHoareTripleChecker+Invalid, 310 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 196 IncrementalHoareTripleChecker+Valid, 114 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:12:43,177 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [288 Valid, 67 Invalid, 310 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [196 Valid, 114 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 20:12:43,178 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 308 states. [2021-11-25 20:12:43,229 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 308 to 265. [2021-11-25 20:12:43,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 265 states, 264 states have (on average 1.125) internal successors, (297), 264 states have internal predecessors, (297), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:12:43,235 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 265 states to 265 states and 297 transitions. [2021-11-25 20:12:43,236 INFO L78 Accepts]: Start accepts. Automaton has 265 states and 297 transitions. Word has length 103 [2021-11-25 20:12:43,236 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:12:43,236 INFO L470 AbstractCegarLoop]: Abstraction has 265 states and 297 transitions. [2021-11-25 20:12:43,236 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 1.5769230769230769) internal successors, (41), 25 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:12:43,237 INFO L276 IsEmpty]: Start isEmpty. Operand 265 states and 297 transitions. [2021-11-25 20:12:43,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 200 [2021-11-25 20:12:43,242 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:12:43,242 INFO L514 BasicCegarLoop]: trace histogram [88, 88, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:12:43,257 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ff87c7-844c-4353-b76b-bb1246bd61b9/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-25 20:12:43,453 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ff87c7-844c-4353-b76b-bb1246bd61b9/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:12:43,454 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:12:43,454 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:12:43,454 INFO L85 PathProgramCache]: Analyzing trace with hash 1794148775, now seen corresponding path program 6 times [2021-11-25 20:12:43,455 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:12:43,455 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2052705329] [2021-11-25 20:12:43,455 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:12:43,455 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:12:43,522 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 20:12:43,523 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [503604155] [2021-11-25 20:12:43,523 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:12:43,523 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:12:43,524 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ff87c7-844c-4353-b76b-bb1246bd61b9/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:12:43,525 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ff87c7-844c-4353-b76b-bb1246bd61b9/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:12:43,548 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ff87c7-844c-4353-b76b-bb1246bd61b9/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-25 20:12:43,772 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:12:43,772 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:12:43,776 INFO L263 TraceCheckSpWp]: Trace formula consists of 427 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-25 20:12:43,784 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:12:44,877 INFO L134 CoverageAnalysis]: Checked inductivity of 8392 backedges. 231 proven. 3206 refuted. 0 times theorem prover too weak. 4955 trivial. 0 not checked. [2021-11-25 20:12:44,878 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:12:45,859 INFO L134 CoverageAnalysis]: Checked inductivity of 8392 backedges. 231 proven. 3206 refuted. 0 times theorem prover too weak. 4955 trivial. 0 not checked. [2021-11-25 20:12:45,859 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:12:45,859 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2052705329] [2021-11-25 20:12:45,859 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 20:12:45,859 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [503604155] [2021-11-25 20:12:45,860 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [503604155] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:12:45,860 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [361883576] [2021-11-25 20:12:45,863 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 20:12:45,863 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:12:45,863 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:12:45,864 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:12:45,864 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:12:45,892 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:12:45,923 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:12:45,924 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:12:45,936 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:12:45,937 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 0 case distinctions, treesize of input 26 treesize of output 34 [2021-11-25 20:12:45,995 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:12:45,997 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 38 [2021-11-25 20:12:46,165 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:12:46,171 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:12:46,174 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:12:46,194 INFO L354 Elim1Store]: treesize reduction 67, result has 9.5 percent of original size [2021-11-25 20:12:46,195 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 273 treesize of output 256 [2021-11-25 20:12:46,321 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 21 treesize of output 17 [2021-11-25 20:12:46,361 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 21 treesize of output 17 [2021-11-25 20:12:46,833 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:12:48,067 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5766#(and (= |ULTIMATE.start_main_~i~0#1| 0) (= |ULTIMATE.start_main_~m~0#1| 1000) (<= 0 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#A~0#1.base|) (+ |ULTIMATE.start_main_~#A~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| (* |ULTIMATE.start_main_~n~0#1| 4)) (* |ULTIMATE.start_main_~j~0#1| 4))) |ULTIMATE.start_main_#t~mem8#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= |ULTIMATE.start_main_#t~mem8#1| |ULTIMATE.start_main_~max~0#1|) 1 0)) (= |ULTIMATE.start_main_~#A~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_~j~0#1| 0) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~n~0#1| 1500) (= |#NULL.base| 0))' at error location [2021-11-25 20:12:48,067 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:12:48,067 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 20:12:48,067 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30] total 58 [2021-11-25 20:12:48,067 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1624009106] [2021-11-25 20:12:48,068 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 20:12:48,068 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2021-11-25 20:12:48,069 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:12:48,070 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-11-25 20:12:48,073 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1261, Invalid=2771, Unknown=0, NotChecked=0, Total=4032 [2021-11-25 20:12:48,073 INFO L87 Difference]: Start difference. First operand 265 states and 297 transitions. Second operand has 58 states, 58 states have (on average 1.3448275862068966) internal successors, (78), 58 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:12:53,074 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:12:53,075 INFO L93 Difference]: Finished difference Result 1437 states and 1647 transitions. [2021-11-25 20:12:53,075 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 112 states. [2021-11-25 20:12:53,076 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 1.3448275862068966) internal successors, (78), 58 states have internal predecessors, (78), 0 states have call successors, (0), 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 199 [2021-11-25 20:12:53,077 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:12:53,088 INFO L225 Difference]: With dead ends: 1437 [2021-11-25 20:12:53,088 INFO L226 Difference]: Without dead ends: 1367 [2021-11-25 20:12:53,106 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 777 GetRequests, 605 SyntacticMatches, 6 SemanticMatches, 166 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11352 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=8544, Invalid=19512, Unknown=0, NotChecked=0, Total=28056 [2021-11-25 20:12:53,107 INFO L933 BasicCegarLoop]: 66 mSDtfsCounter, 450 mSDsluCounter, 676 mSDsCounter, 0 mSdLazyCounter, 1099 mSolverCounterSat, 533 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 450 SdHoareTripleChecker+Valid, 742 SdHoareTripleChecker+Invalid, 1632 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 533 IncrementalHoareTripleChecker+Valid, 1099 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2021-11-25 20:12:53,107 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [450 Valid, 742 Invalid, 1632 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [533 Valid, 1099 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2021-11-25 20:12:53,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1367 states. [2021-11-25 20:12:53,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1367 to 409. [2021-11-25 20:12:53,204 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 409 states, 408 states have (on average 1.0955882352941178) internal successors, (447), 408 states have internal predecessors, (447), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:12:53,206 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 409 states to 409 states and 447 transitions. [2021-11-25 20:12:53,207 INFO L78 Accepts]: Start accepts. Automaton has 409 states and 447 transitions. Word has length 199 [2021-11-25 20:12:53,208 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:12:53,208 INFO L470 AbstractCegarLoop]: Abstraction has 409 states and 447 transitions. [2021-11-25 20:12:53,209 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 58 states have (on average 1.3448275862068966) internal successors, (78), 58 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:12:53,209 INFO L276 IsEmpty]: Start isEmpty. Operand 409 states and 447 transitions. [2021-11-25 20:12:53,221 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 344 [2021-11-25 20:12:53,221 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:12:53,221 INFO L514 BasicCegarLoop]: trace histogram [220, 88, 10, 10, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:12:53,263 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ff87c7-844c-4353-b76b-bb1246bd61b9/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-25 20:12:53,449 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ff87c7-844c-4353-b76b-bb1246bd61b9/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:12:53,449 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:12:53,450 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:12:53,450 INFO L85 PathProgramCache]: Analyzing trace with hash 454563679, now seen corresponding path program 7 times [2021-11-25 20:12:53,450 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:12:53,450 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1304441460] [2021-11-25 20:12:53,450 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:12:53,450 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:12:53,513 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 20:12:53,513 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1518167192] [2021-11-25 20:12:53,513 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:12:53,514 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:12:53,514 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ff87c7-844c-4353-b76b-bb1246bd61b9/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:12:53,520 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ff87c7-844c-4353-b76b-bb1246bd61b9/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:12:53,530 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ff87c7-844c-4353-b76b-bb1246bd61b9/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-25 20:12:54,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:12:54,078 INFO L263 TraceCheckSpWp]: Trace formula consists of 1826 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-25 20:12:54,087 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:12:55,124 INFO L134 CoverageAnalysis]: Checked inductivity of 30586 backedges. 1591 proven. 253 refuted. 0 times theorem prover too weak. 28742 trivial. 0 not checked. [2021-11-25 20:12:55,124 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:12:56,660 INFO L134 CoverageAnalysis]: Checked inductivity of 30586 backedges. 1591 proven. 253 refuted. 0 times theorem prover too weak. 28742 trivial. 0 not checked. [2021-11-25 20:12:56,660 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:12:56,660 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1304441460] [2021-11-25 20:12:56,661 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 20:12:56,661 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1518167192] [2021-11-25 20:12:56,661 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1518167192] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:12:56,661 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [99990897] [2021-11-25 20:12:56,663 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 20:12:56,663 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:12:56,664 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:12:56,664 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:12:56,664 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:12:56,684 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:12:56,722 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:12:56,722 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:12:56,732 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:12:56,734 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 0 case distinctions, treesize of input 26 treesize of output 34 [2021-11-25 20:12:56,784 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:12:56,785 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 38 [2021-11-25 20:12:57,009 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:12:57,012 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:12:57,015 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:12:57,034 INFO L354 Elim1Store]: treesize reduction 67, result has 9.5 percent of original size [2021-11-25 20:12:57,035 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 273 treesize of output 256 [2021-11-25 20:12:57,117 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 21 treesize of output 17 [2021-11-25 20:12:57,152 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 21 treesize of output 17 [2021-11-25 20:12:57,544 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:12:58,527 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11426#(and (= |ULTIMATE.start_main_~i~0#1| 0) (= |ULTIMATE.start_main_~m~0#1| 1000) (<= 0 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#A~0#1.base|) (+ |ULTIMATE.start_main_~#A~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| (* |ULTIMATE.start_main_~n~0#1| 4)) (* |ULTIMATE.start_main_~j~0#1| 4))) |ULTIMATE.start_main_#t~mem8#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= |ULTIMATE.start_main_#t~mem8#1| |ULTIMATE.start_main_~max~0#1|) 1 0)) (= |ULTIMATE.start_main_~#A~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_~j~0#1| 0) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~n~0#1| 1500) (= |#NULL.base| 0))' at error location [2021-11-25 20:12:58,527 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:12:58,527 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 20:12:58,527 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 49 [2021-11-25 20:12:58,527 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1250789144] [2021-11-25 20:12:58,528 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 20:12:58,529 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2021-11-25 20:12:58,529 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:12:58,529 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-11-25 20:12:58,530 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1352, Invalid=1728, Unknown=0, NotChecked=0, Total=3080 [2021-11-25 20:12:58,531 INFO L87 Difference]: Start difference. First operand 409 states and 447 transitions. Second operand has 50 states, 50 states have (on average 1.24) internal successors, (62), 49 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:13:01,126 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:13:01,126 INFO L93 Difference]: Finished difference Result 1292 states and 1706 transitions. [2021-11-25 20:13:01,127 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-11-25 20:13:01,127 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 1.24) internal successors, (62), 49 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 343 [2021-11-25 20:13:01,127 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:13:01,133 INFO L225 Difference]: With dead ends: 1292 [2021-11-25 20:13:01,133 INFO L226 Difference]: Without dead ends: 908 [2021-11-25 20:13:01,138 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1050 GetRequests, 961 SyntacticMatches, 12 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2604 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=2571, Invalid=3591, Unknown=0, NotChecked=0, Total=6162 [2021-11-25 20:13:01,139 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 740 mSDsluCounter, 135 mSDsCounter, 0 mSdLazyCounter, 204 mSolverCounterSat, 553 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 740 SdHoareTripleChecker+Valid, 139 SdHoareTripleChecker+Invalid, 757 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 553 IncrementalHoareTripleChecker+Valid, 204 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-25 20:13:01,140 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [740 Valid, 139 Invalid, 757 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [553 Valid, 204 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-25 20:13:01,141 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 908 states. [2021-11-25 20:13:01,273 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 908 to 817. [2021-11-25 20:13:01,274 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 817 states, 816 states have (on average 1.0772058823529411) internal successors, (879), 816 states have internal predecessors, (879), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:13:01,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 817 states to 817 states and 879 transitions. [2021-11-25 20:13:01,278 INFO L78 Accepts]: Start accepts. Automaton has 817 states and 879 transitions. Word has length 343 [2021-11-25 20:13:01,279 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:13:01,279 INFO L470 AbstractCegarLoop]: Abstraction has 817 states and 879 transitions. [2021-11-25 20:13:01,279 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 1.24) internal successors, (62), 49 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:13:01,279 INFO L276 IsEmpty]: Start isEmpty. Operand 817 states and 879 transitions. [2021-11-25 20:13:01,322 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 680 [2021-11-25 20:13:01,322 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:13:01,323 INFO L514 BasicCegarLoop]: trace histogram [460, 184, 10, 10, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:13:01,367 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ff87c7-844c-4353-b76b-bb1246bd61b9/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-25 20:13:01,537 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ff87c7-844c-4353-b76b-bb1246bd61b9/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-25 20:13:01,537 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:13:01,538 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:13:01,538 INFO L85 PathProgramCache]: Analyzing trace with hash -1047298977, now seen corresponding path program 8 times [2021-11-25 20:13:01,538 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:13:01,538 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [126761203] [2021-11-25 20:13:01,538 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:13:01,539 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:13:01,663 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 20:13:01,663 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [331909076] [2021-11-25 20:13:01,663 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:13:01,664 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:13:01,664 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ff87c7-844c-4353-b76b-bb1246bd61b9/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:13:01,665 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ff87c7-844c-4353-b76b-bb1246bd61b9/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:13:01,685 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ff87c7-844c-4353-b76b-bb1246bd61b9/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process