./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-crafted/zero_sum5.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 8393723b Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-crafted/zero_sum5.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 1caf94d5755d978efe1a3e5e557e469a697b8b845c60d509025c0b6bf4eae4ae --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-8393723 [2022-11-19 08:11:58,559 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-19 08:11:58,562 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-19 08:11:58,603 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-19 08:11:58,603 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-19 08:11:58,607 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-19 08:11:58,610 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-19 08:11:58,614 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-19 08:11:58,616 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-19 08:11:58,624 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-19 08:11:58,625 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-19 08:11:58,627 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-19 08:11:58,628 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-19 08:11:58,630 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-19 08:11:58,631 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-19 08:11:58,633 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-19 08:11:58,634 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-19 08:11:58,635 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-19 08:11:58,637 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-19 08:11:58,644 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-19 08:11:58,645 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-19 08:11:58,647 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-19 08:11:58,649 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-19 08:11:58,650 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-19 08:11:58,658 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-19 08:11:58,659 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-19 08:11:58,659 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-19 08:11:58,661 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-19 08:11:58,661 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-19 08:11:58,662 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-19 08:11:58,662 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-19 08:11:58,663 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-19 08:11:58,665 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-19 08:11:58,666 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-19 08:11:58,668 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-19 08:11:58,668 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-19 08:11:58,669 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-19 08:11:58,669 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-19 08:11:58,670 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-19 08:11:58,670 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-19 08:11:58,671 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-19 08:11:58,672 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-19 08:11:58,711 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-19 08:11:58,711 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-19 08:11:58,712 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-19 08:11:58,712 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-19 08:11:58,713 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-19 08:11:58,713 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-19 08:11:58,714 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-19 08:11:58,714 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-19 08:11:58,714 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-19 08:11:58,714 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-19 08:11:58,715 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-19 08:11:58,716 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-19 08:11:58,716 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-19 08:11:58,716 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-19 08:11:58,716 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-19 08:11:58,717 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-19 08:11:58,717 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-19 08:11:58,717 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-19 08:11:58,718 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-19 08:11:58,718 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-19 08:11:58,718 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-19 08:11:58,719 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-19 08:11:58,719 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-19 08:11:58,719 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-19 08:11:58,719 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-19 08:11:58,720 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-19 08:11:58,720 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-19 08:11:58,720 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-19 08:11:58,720 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-19 08:11:58,720 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-19 08:11:58,721 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-19 08:11:58,721 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-19 08:11:58,721 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-19 08:11:58,722 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-19 08:11:58,722 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-19 08:11:58,722 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-19 08:11:58,722 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-19 08:11:58,723 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-19 08:11:58,723 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-19 08:11:58,723 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-19 08:11:58,723 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-19 08:11:58,723 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 1caf94d5755d978efe1a3e5e557e469a697b8b845c60d509025c0b6bf4eae4ae [2022-11-19 08:11:59,016 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-19 08:11:59,060 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-19 08:11:59,063 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-19 08:11:59,064 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-19 08:11:59,065 INFO L275 PluginConnector]: CDTParser initialized [2022-11-19 08:11:59,066 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/../../sv-benchmarks/c/array-crafted/zero_sum5.c [2022-11-19 08:11:59,149 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/data/e94250ab0/e8ba8ca0d85742ffbd9698a88ace7f4d/FLAGb05f38e15 [2022-11-19 08:11:59,672 INFO L306 CDTParser]: Found 1 translation units. [2022-11-19 08:11:59,673 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/sv-benchmarks/c/array-crafted/zero_sum5.c [2022-11-19 08:11:59,679 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/data/e94250ab0/e8ba8ca0d85742ffbd9698a88ace7f4d/FLAGb05f38e15 [2022-11-19 08:12:00,055 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/data/e94250ab0/e8ba8ca0d85742ffbd9698a88ace7f4d [2022-11-19 08:12:00,059 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-19 08:12:00,060 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-19 08:12:00,062 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-19 08:12:00,063 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-19 08:12:00,077 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-19 08:12:00,078 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 08:12:00" (1/1) ... [2022-11-19 08:12:00,079 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@764ddc2d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:12:00, skipping insertion in model container [2022-11-19 08:12:00,080 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 08:12:00" (1/1) ... [2022-11-19 08:12:00,088 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-19 08:12:00,105 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-19 08:12:00,296 WARN L234 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/sv-benchmarks/c/array-crafted/zero_sum5.c[400,413] [2022-11-19 08:12:00,322 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-19 08:12:00,330 INFO L203 MainTranslator]: Completed pre-run [2022-11-19 08:12:00,340 WARN L234 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/sv-benchmarks/c/array-crafted/zero_sum5.c[400,413] [2022-11-19 08:12:00,356 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-19 08:12:00,369 INFO L208 MainTranslator]: Completed translation [2022-11-19 08:12:00,369 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:12:00 WrapperNode [2022-11-19 08:12:00,369 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-19 08:12:00,370 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-19 08:12:00,370 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-19 08:12:00,370 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-19 08:12:00,378 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:12:00" (1/1) ... [2022-11-19 08:12:00,385 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:12:00" (1/1) ... [2022-11-19 08:12:00,410 INFO L138 Inliner]: procedures = 15, calls = 21, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 149 [2022-11-19 08:12:00,412 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-19 08:12:00,417 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-19 08:12:00,417 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-19 08:12:00,417 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-19 08:12:00,426 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:12:00" (1/1) ... [2022-11-19 08:12:00,427 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:12:00" (1/1) ... [2022-11-19 08:12:00,429 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:12:00" (1/1) ... [2022-11-19 08:12:00,430 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:12:00" (1/1) ... [2022-11-19 08:12:00,436 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:12:00" (1/1) ... [2022-11-19 08:12:00,441 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:12:00" (1/1) ... [2022-11-19 08:12:00,452 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:12:00" (1/1) ... [2022-11-19 08:12:00,453 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:12:00" (1/1) ... [2022-11-19 08:12:00,456 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-19 08:12:00,457 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-19 08:12:00,457 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-19 08:12:00,457 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-19 08:12:00,458 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:12:00" (1/1) ... [2022-11-19 08:12:00,468 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-19 08:12:00,480 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:12:00,492 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-19 08:12:00,500 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-19 08:12:00,537 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-19 08:12:00,537 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-19 08:12:00,537 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-11-19 08:12:00,537 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-11-19 08:12:00,537 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-19 08:12:00,537 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-19 08:12:00,538 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-11-19 08:12:00,538 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-11-19 08:12:00,619 INFO L235 CfgBuilder]: Building ICFG [2022-11-19 08:12:00,621 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-19 08:12:00,874 INFO L276 CfgBuilder]: Performing block encoding [2022-11-19 08:12:00,997 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-19 08:12:00,998 INFO L300 CfgBuilder]: Removed 11 assume(true) statements. [2022-11-19 08:12:01,001 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 08:12:01 BoogieIcfgContainer [2022-11-19 08:12:01,001 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-19 08:12:01,004 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-19 08:12:01,004 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-19 08:12:01,008 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-19 08:12:01,008 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 08:12:00" (1/3) ... [2022-11-19 08:12:01,009 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@352a819a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 08:12:01, skipping insertion in model container [2022-11-19 08:12:01,010 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:12:00" (2/3) ... [2022-11-19 08:12:01,010 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@352a819a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 08:12:01, skipping insertion in model container [2022-11-19 08:12:01,010 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 08:12:01" (3/3) ... [2022-11-19 08:12:01,021 INFO L112 eAbstractionObserver]: Analyzing ICFG zero_sum5.c [2022-11-19 08:12:01,040 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-19 08:12:01,040 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-19 08:12:01,104 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-19 08:12:01,112 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@553d19e2, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-19 08:12:01,113 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-19 08:12:01,117 INFO L276 IsEmpty]: Start isEmpty. Operand has 19 states, 17 states have (on average 1.8235294117647058) internal successors, (31), 18 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:12:01,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-11-19 08:12:01,125 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:12:01,126 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:12:01,126 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:12:01,132 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:12:01,133 INFO L85 PathProgramCache]: Analyzing trace with hash 736515381, now seen corresponding path program 1 times [2022-11-19 08:12:01,144 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:12:01,145 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2014743939] [2022-11-19 08:12:01,145 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:12:01,146 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:12:01,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:12:01,482 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:12:01,482 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:12:01,483 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2014743939] [2022-11-19 08:12:01,484 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2014743939] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 08:12:01,484 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 08:12:01,484 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-19 08:12:01,486 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [926194184] [2022-11-19 08:12:01,487 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 08:12:01,492 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-19 08:12:01,493 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:12:01,524 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-19 08:12:01,525 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-19 08:12:01,528 INFO L87 Difference]: Start difference. First operand has 19 states, 17 states have (on average 1.8235294117647058) internal successors, (31), 18 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:12:01,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:12:01,617 INFO L93 Difference]: Finished difference Result 36 states and 59 transitions. [2022-11-19 08:12:01,619 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-19 08:12:01,620 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2022-11-19 08:12:01,621 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:12:01,629 INFO L225 Difference]: With dead ends: 36 [2022-11-19 08:12:01,630 INFO L226 Difference]: Without dead ends: 17 [2022-11-19 08:12:01,633 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-19 08:12:01,637 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 0 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 49 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 08:12:01,638 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 10 Invalid, 49 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 49 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 08:12:01,657 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2022-11-19 08:12:01,670 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2022-11-19 08:12:01,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 16 states have (on average 1.6875) internal successors, (27), 16 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:12:01,672 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 27 transitions. [2022-11-19 08:12:01,674 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 27 transitions. Word has length 15 [2022-11-19 08:12:01,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:12:01,674 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 27 transitions. [2022-11-19 08:12:01,675 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:12:01,675 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 27 transitions. [2022-11-19 08:12:01,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-11-19 08:12:01,676 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:12:01,676 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:12:01,676 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-19 08:12:01,677 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:12:01,678 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:12:01,678 INFO L85 PathProgramCache]: Analyzing trace with hash -1473336354, now seen corresponding path program 1 times [2022-11-19 08:12:01,678 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:12:01,678 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1206370901] [2022-11-19 08:12:01,679 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:12:01,679 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:12:01,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:12:01,810 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 08:12:01,810 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:12:01,811 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1206370901] [2022-11-19 08:12:01,811 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1206370901] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 08:12:01,813 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 08:12:01,813 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-19 08:12:01,813 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1900956879] [2022-11-19 08:12:01,814 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 08:12:01,815 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-19 08:12:01,816 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:12:01,817 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-19 08:12:01,819 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-19 08:12:01,819 INFO L87 Difference]: Start difference. First operand 17 states and 27 transitions. Second operand has 4 states, 4 states have (on average 4.0) internal successors, (16), 4 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:12:01,952 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:12:01,952 INFO L93 Difference]: Finished difference Result 39 states and 67 transitions. [2022-11-19 08:12:01,953 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-19 08:12:01,954 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.0) internal successors, (16), 4 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2022-11-19 08:12:01,954 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:12:01,956 INFO L225 Difference]: With dead ends: 39 [2022-11-19 08:12:01,956 INFO L226 Difference]: Without dead ends: 27 [2022-11-19 08:12:01,962 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-19 08:12:01,965 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 33 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 5 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 08:12:01,967 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [33 Valid, 5 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 08:12:01,970 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2022-11-19 08:12:01,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2022-11-19 08:12:01,978 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.4230769230769231) internal successors, (37), 26 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:12:01,979 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 37 transitions. [2022-11-19 08:12:01,979 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 37 transitions. Word has length 16 [2022-11-19 08:12:01,979 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:12:01,980 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 37 transitions. [2022-11-19 08:12:01,980 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 4.0) internal successors, (16), 4 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:12:01,980 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 37 transitions. [2022-11-19 08:12:01,981 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-11-19 08:12:01,981 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:12:01,981 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:12:01,982 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-19 08:12:01,982 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:12:01,983 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:12:01,983 INFO L85 PathProgramCache]: Analyzing trace with hash 479326558, now seen corresponding path program 1 times [2022-11-19 08:12:01,983 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:12:01,984 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [233245310] [2022-11-19 08:12:01,984 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:12:01,984 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:12:02,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:12:02,129 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-19 08:12:02,130 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:12:02,130 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [233245310] [2022-11-19 08:12:02,130 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [233245310] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:12:02,131 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1075421878] [2022-11-19 08:12:02,131 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:12:02,131 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:12:02,131 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:12:02,135 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:12:02,144 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-19 08:12:02,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:12:02,251 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-19 08:12:02,260 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:12:02,345 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-19 08:12:02,345 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:12:02,390 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-19 08:12:02,391 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1075421878] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:12:02,393 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [809383985] [2022-11-19 08:12:02,425 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-11-19 08:12:02,425 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:12:02,428 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:12:02,435 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:12:02,439 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:12:02,532 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:12:02,576 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-19 08:12:02,578 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 08:12:02,615 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:12:02,653 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-19 08:12:02,656 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 08:12:02,734 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:12:02,736 INFO L350 Elim1Store]: Elim1 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 31 treesize of output 33 [2022-11-19 08:12:02,919 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:12:02,922 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:12:02,939 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-19 08:12:02,940 INFO L350 Elim1Store]: Elim1 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 244 treesize of output 232 [2022-11-19 08:12:03,055 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-19 08:12:03,590 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:12:04,014 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '394#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 08:12:04,015 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:12:04,015 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:12:04,015 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2022-11-19 08:12:04,015 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1578555074] [2022-11-19 08:12:04,016 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:12:04,016 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-19 08:12:04,016 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:12:04,017 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-19 08:12:04,017 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2022-11-19 08:12:04,017 INFO L87 Difference]: Start difference. First operand 27 states and 37 transitions. Second operand has 7 states, 7 states have (on average 4.428571428571429) internal successors, (31), 7 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:12:04,088 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:12:04,089 INFO L93 Difference]: Finished difference Result 51 states and 71 transitions. [2022-11-19 08:12:04,089 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-19 08:12:04,089 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.428571428571429) internal successors, (31), 7 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2022-11-19 08:12:04,090 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:12:04,090 INFO L225 Difference]: With dead ends: 51 [2022-11-19 08:12:04,090 INFO L226 Difference]: Without dead ends: 28 [2022-11-19 08:12:04,091 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 61 SyntacticMatches, 9 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 93 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2022-11-19 08:12:04,092 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 5 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 08:12:04,093 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 5 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 08:12:04,094 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2022-11-19 08:12:04,098 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2022-11-19 08:12:04,098 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 27 states have (on average 1.4074074074074074) internal successors, (38), 27 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:12:04,099 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 38 transitions. [2022-11-19 08:12:04,100 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 38 transitions. Word has length 26 [2022-11-19 08:12:04,100 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:12:04,100 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 38 transitions. [2022-11-19 08:12:04,100 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 4.428571428571429) internal successors, (31), 7 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:12:04,101 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 38 transitions. [2022-11-19 08:12:04,101 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-11-19 08:12:04,101 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:12:04,102 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:12:04,122 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-19 08:12:04,316 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:12:04,317 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:12:04,317 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:12:04,317 INFO L85 PathProgramCache]: Analyzing trace with hash 1696466709, now seen corresponding path program 2 times [2022-11-19 08:12:04,317 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:12:04,317 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [397669321] [2022-11-19 08:12:04,318 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:12:04,318 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:12:04,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:12:04,492 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-19 08:12:04,493 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:12:04,493 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [397669321] [2022-11-19 08:12:04,493 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [397669321] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:12:04,493 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1110565647] [2022-11-19 08:12:04,494 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 08:12:04,494 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:12:04,494 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:12:04,495 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:12:04,515 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-19 08:12:04,575 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-19 08:12:04,576 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:12:04,577 INFO L263 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-19 08:12:04,579 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:12:04,637 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-19 08:12:04,637 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:12:04,682 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-19 08:12:04,682 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1110565647] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:12:04,682 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1631652437] [2022-11-19 08:12:04,685 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-11-19 08:12:04,686 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:12:04,686 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:12:04,686 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:12:04,687 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:12:04,716 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:12:04,746 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-19 08:12:04,747 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 08:12:04,764 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:12:04,804 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-19 08:12:04,805 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 08:12:04,836 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:12:04,837 INFO L350 Elim1Store]: Elim1 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 26 treesize of output 28 [2022-11-19 08:12:04,900 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:12:04,902 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 08:12:04,931 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-19 08:12:04,932 INFO L350 Elim1Store]: Elim1 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 234 treesize of output 233 [2022-11-19 08:12:05,050 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-19 08:12:05,365 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:12:05,775 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '708#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |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___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 08:12:05,775 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:12:05,775 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:12:05,775 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2022-11-19 08:12:05,775 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1564588482] [2022-11-19 08:12:05,776 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:12:05,776 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-19 08:12:05,776 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:12:05,777 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-19 08:12:05,777 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=118, Unknown=0, NotChecked=0, Total=156 [2022-11-19 08:12:05,777 INFO L87 Difference]: Start difference. First operand 28 states and 38 transitions. Second operand has 8 states, 8 states have (on average 5.5) internal successors, (44), 8 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:12:05,899 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:12:05,899 INFO L93 Difference]: Finished difference Result 59 states and 87 transitions. [2022-11-19 08:12:05,900 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-19 08:12:05,900 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 5.5) internal successors, (44), 8 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 27 [2022-11-19 08:12:05,900 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:12:05,901 INFO L225 Difference]: With dead ends: 59 [2022-11-19 08:12:05,901 INFO L226 Difference]: Without dead ends: 38 [2022-11-19 08:12:05,902 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 56 SyntacticMatches, 17 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 165 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=38, Invalid=118, Unknown=0, NotChecked=0, Total=156 [2022-11-19 08:12:05,903 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 19 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 46 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 111 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 46 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 08:12:05,903 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 9 Invalid, 111 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [46 Valid, 65 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 08:12:05,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2022-11-19 08:12:05,909 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2022-11-19 08:12:05,909 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 37 states have (on average 1.2972972972972974) internal successors, (48), 37 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:12:05,910 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 48 transitions. [2022-11-19 08:12:05,910 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 48 transitions. Word has length 27 [2022-11-19 08:12:05,910 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:12:05,910 INFO L495 AbstractCegarLoop]: Abstraction has 38 states and 48 transitions. [2022-11-19 08:12:05,910 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 5.5) internal successors, (44), 8 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:12:05,910 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 48 transitions. [2022-11-19 08:12:05,911 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-11-19 08:12:05,912 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:12:05,912 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:12:05,922 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-19 08:12:06,117 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:12:06,118 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:12:06,119 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:12:06,119 INFO L85 PathProgramCache]: Analyzing trace with hash -1441672107, now seen corresponding path program 3 times [2022-11-19 08:12:06,119 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:12:06,120 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1298986797] [2022-11-19 08:12:06,120 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:12:06,120 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:12:06,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:12:10,777 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:12:10,777 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:12:10,778 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1298986797] [2022-11-19 08:12:10,778 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1298986797] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:12:10,778 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [695004507] [2022-11-19 08:12:10,778 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 08:12:10,778 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:12:10,779 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:12:10,780 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:12:10,817 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-19 08:12:10,881 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 08:12:10,882 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:12:10,885 INFO L263 TraceCheckSpWp]: Trace formula consists of 200 conjuncts, 96 conjunts are in the unsatisfiable core [2022-11-19 08:12:10,889 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:12:10,917 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2022-11-19 08:12:11,633 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:12:11,633 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:12:12,006 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-19 08:12:12,006 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [695004507] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:12:12,007 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1093827379] [2022-11-19 08:12:12,013 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-11-19 08:12:12,013 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:12:12,013 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:12:12,013 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:12:12,014 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:12:12,038 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:12:12,067 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-19 08:12:12,068 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 08:12:12,085 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:12:12,122 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-19 08:12:12,123 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 08:12:12,152 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:12:12,154 INFO L350 Elim1Store]: Elim1 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 26 treesize of output 28 [2022-11-19 08:12:12,213 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:12:12,215 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 08:12:12,246 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-19 08:12:12,247 INFO L350 Elim1Store]: Elim1 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 234 treesize of output 233 [2022-11-19 08:12:12,343 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-19 08:12:12,643 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:12:13,425 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1128#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 08:12:13,425 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:12:13,425 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:12:13,425 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 9] total 18 [2022-11-19 08:12:13,425 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1588448391] [2022-11-19 08:12:13,426 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:12:13,426 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-11-19 08:12:13,426 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:12:13,426 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-11-19 08:12:13,427 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2022-11-19 08:12:13,427 INFO L87 Difference]: Start difference. First operand 38 states and 48 transitions. Second operand has 18 states, 18 states have (on average 3.9444444444444446) internal successors, (71), 18 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:12:13,865 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:12:13,865 INFO L93 Difference]: Finished difference Result 69 states and 88 transitions. [2022-11-19 08:12:13,866 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-19 08:12:13,866 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 3.9444444444444446) internal successors, (71), 18 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 37 [2022-11-19 08:12:13,866 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:12:13,867 INFO L225 Difference]: With dead ends: 69 [2022-11-19 08:12:13,867 INFO L226 Difference]: Without dead ends: 66 [2022-11-19 08:12:13,867 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 69 SyntacticMatches, 55 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 381 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=69, Invalid=483, Unknown=0, NotChecked=0, Total=552 [2022-11-19 08:12:13,868 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 19 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 509 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 511 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 509 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-19 08:12:13,868 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 23 Invalid, 511 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 509 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-19 08:12:13,869 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2022-11-19 08:12:13,881 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 64. [2022-11-19 08:12:13,884 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 63 states have (on average 1.3174603174603174) internal successors, (83), 63 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:12:13,889 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 83 transitions. [2022-11-19 08:12:13,889 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 83 transitions. Word has length 37 [2022-11-19 08:12:13,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:12:13,890 INFO L495 AbstractCegarLoop]: Abstraction has 64 states and 83 transitions. [2022-11-19 08:12:13,890 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 3.9444444444444446) internal successors, (71), 18 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:12:13,890 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 83 transitions. [2022-11-19 08:12:13,894 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-11-19 08:12:13,894 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:12:13,894 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:12:13,908 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-19 08:12:14,101 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:12:14,101 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:12:14,102 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:12:14,102 INFO L85 PathProgramCache]: Analyzing trace with hash 1123091444, now seen corresponding path program 4 times [2022-11-19 08:12:14,102 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:12:14,102 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [287043216] [2022-11-19 08:12:14,102 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:12:14,103 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:12:14,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:12:14,270 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2022-11-19 08:12:14,272 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:12:14,273 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [287043216] [2022-11-19 08:12:14,273 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [287043216] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:12:14,273 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1090024990] [2022-11-19 08:12:14,273 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 08:12:14,273 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:12:14,274 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:12:14,275 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:12:14,303 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-19 08:12:14,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:12:14,375 INFO L263 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-19 08:12:14,378 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:12:14,446 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2022-11-19 08:12:14,447 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:12:14,504 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2022-11-19 08:12:14,504 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1090024990] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:12:14,504 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1793942058] [2022-11-19 08:12:14,507 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-11-19 08:12:14,507 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:12:14,508 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:12:14,508 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:12:14,509 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:12:14,526 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:12:14,552 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-19 08:12:14,553 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 08:12:14,562 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:12:14,564 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-19 08:12:14,585 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:12:14,586 INFO L350 Elim1Store]: Elim1 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 26 treesize of output 28 [2022-11-19 08:12:14,644 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:12:14,646 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 08:12:14,668 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-19 08:12:14,669 INFO L350 Elim1Store]: Elim1 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 234 treesize of output 233 [2022-11-19 08:12:14,751 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-19 08:12:15,028 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:12:15,655 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1624#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 08:12:15,656 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:12:15,656 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:12:15,656 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2022-11-19 08:12:15,656 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1809735236] [2022-11-19 08:12:15,656 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:12:15,657 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-19 08:12:15,657 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:12:15,657 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-19 08:12:15,657 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=274, Unknown=0, NotChecked=0, Total=342 [2022-11-19 08:12:15,658 INFO L87 Difference]: Start difference. First operand 64 states and 83 transitions. Second operand has 14 states, 14 states have (on average 2.642857142857143) internal successors, (37), 14 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:12:15,969 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:12:15,970 INFO L93 Difference]: Finished difference Result 126 states and 164 transitions. [2022-11-19 08:12:15,970 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-19 08:12:15,970 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.642857142857143) internal successors, (37), 14 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 38 [2022-11-19 08:12:15,971 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:12:15,971 INFO L225 Difference]: With dead ends: 126 [2022-11-19 08:12:15,971 INFO L226 Difference]: Without dead ends: 65 [2022-11-19 08:12:15,972 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 79 SyntacticMatches, 25 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 384 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=94, Invalid=368, Unknown=0, NotChecked=0, Total=462 [2022-11-19 08:12:15,973 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 35 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 289 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 340 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 289 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-19 08:12:15,973 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [35 Valid, 15 Invalid, 340 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 289 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-19 08:12:15,974 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2022-11-19 08:12:15,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2022-11-19 08:12:15,989 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 64 states have (on average 1.3125) internal successors, (84), 64 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:12:15,994 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 84 transitions. [2022-11-19 08:12:15,995 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 84 transitions. Word has length 38 [2022-11-19 08:12:15,995 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:12:15,996 INFO L495 AbstractCegarLoop]: Abstraction has 65 states and 84 transitions. [2022-11-19 08:12:15,996 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.642857142857143) internal successors, (37), 14 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:12:15,996 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 84 transitions. [2022-11-19 08:12:15,998 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-11-19 08:12:15,999 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:12:15,999 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:12:16,016 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-19 08:12:16,206 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:12:16,207 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:12:16,207 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:12:16,207 INFO L85 PathProgramCache]: Analyzing trace with hash 1487879979, now seen corresponding path program 5 times [2022-11-19 08:12:16,208 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:12:16,208 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1702857490] [2022-11-19 08:12:16,208 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:12:16,208 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:12:16,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:12:16,341 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-11-19 08:12:16,341 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:12:16,342 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1702857490] [2022-11-19 08:12:16,342 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1702857490] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:12:16,342 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1839414924] [2022-11-19 08:12:16,342 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 08:12:16,342 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:12:16,343 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:12:16,344 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:12:16,371 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-19 08:12:16,447 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-19 08:12:16,447 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:12:16,449 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-19 08:12:16,451 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:12:16,561 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-11-19 08:12:16,561 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:12:16,671 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-11-19 08:12:16,671 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1839414924] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:12:16,671 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [528134687] [2022-11-19 08:12:16,676 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-11-19 08:12:16,676 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:12:16,677 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:12:16,677 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:12:16,677 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:12:16,701 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:12:16,730 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-19 08:12:16,731 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 08:12:16,755 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:12:16,784 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-19 08:12:16,785 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 08:12:16,814 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:12:16,816 INFO L350 Elim1Store]: Elim1 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 26 treesize of output 28 [2022-11-19 08:12:16,888 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:12:16,890 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 08:12:16,916 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-19 08:12:16,917 INFO L350 Elim1Store]: Elim1 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 234 treesize of output 233 [2022-11-19 08:12:17,010 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-19 08:12:17,285 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:12:17,845 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2246#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |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___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 08:12:17,845 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:12:17,846 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:12:17,846 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2022-11-19 08:12:17,846 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2069696432] [2022-11-19 08:12:17,846 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:12:17,846 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-19 08:12:17,847 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:12:17,847 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-19 08:12:17,847 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=271, Unknown=0, NotChecked=0, Total=342 [2022-11-19 08:12:17,847 INFO L87 Difference]: Start difference. First operand 65 states and 84 transitions. Second operand has 14 states, 14 states have (on average 4.071428571428571) internal successors, (57), 14 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:12:18,060 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:12:18,060 INFO L93 Difference]: Finished difference Result 102 states and 138 transitions. [2022-11-19 08:12:18,060 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-19 08:12:18,061 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 4.071428571428571) internal successors, (57), 14 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 39 [2022-11-19 08:12:18,061 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:12:18,061 INFO L225 Difference]: With dead ends: 102 [2022-11-19 08:12:18,061 INFO L226 Difference]: Without dead ends: 49 [2022-11-19 08:12:18,062 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 82 SyntacticMatches, 25 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 403 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=114, Invalid=392, Unknown=0, NotChecked=0, Total=506 [2022-11-19 08:12:18,063 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 113 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 130 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 113 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 185 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 130 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 08:12:18,063 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [113 Valid, 11 Invalid, 185 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [55 Valid, 130 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 08:12:18,064 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2022-11-19 08:12:18,071 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2022-11-19 08:12:18,071 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 48 states have (on average 1.2291666666666667) internal successors, (59), 48 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:12:18,071 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 59 transitions. [2022-11-19 08:12:18,071 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 59 transitions. Word has length 39 [2022-11-19 08:12:18,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:12:18,072 INFO L495 AbstractCegarLoop]: Abstraction has 49 states and 59 transitions. [2022-11-19 08:12:18,072 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 4.071428571428571) internal successors, (57), 14 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:12:18,072 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 59 transitions. [2022-11-19 08:12:18,072 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-11-19 08:12:18,072 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:12:18,072 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:12:18,088 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-19 08:12:18,273 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:12:18,273 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:12:18,274 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:12:18,274 INFO L85 PathProgramCache]: Analyzing trace with hash -2044847426, now seen corresponding path program 6 times [2022-11-19 08:12:18,274 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:12:18,274 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [391666588] [2022-11-19 08:12:18,274 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:12:18,275 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:12:18,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:12:24,403 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:12:24,403 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:12:24,403 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [391666588] [2022-11-19 08:12:24,403 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [391666588] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:12:24,403 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [803762635] [2022-11-19 08:12:24,403 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 08:12:24,404 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:12:24,404 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:12:24,411 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:12:24,419 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-19 08:12:24,527 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 08:12:24,527 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:12:24,531 WARN L261 TraceCheckSpWp]: Trace formula consists of 259 conjuncts, 138 conjunts are in the unsatisfiable core [2022-11-19 08:12:24,536 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:12:24,573 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2022-11-19 08:12:26,269 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:12:26,269 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:12:27,103 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-19 08:12:27,103 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [803762635] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:12:27,103 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [802938354] [2022-11-19 08:12:27,106 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-11-19 08:12:27,106 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:12:27,106 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:12:27,107 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:12:27,107 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:12:27,126 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:12:27,153 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-19 08:12:27,153 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 08:12:27,166 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:12:27,204 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-19 08:12:27,205 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 08:12:27,229 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:12:27,230 INFO L350 Elim1Store]: Elim1 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 26 treesize of output 28 [2022-11-19 08:12:27,303 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:12:27,304 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 08:12:27,327 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-19 08:12:27,328 INFO L350 Elim1Store]: Elim1 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 234 treesize of output 233 [2022-11-19 08:12:27,405 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-19 08:12:27,655 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:12:29,504 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2877#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |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___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 08:12:29,505 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:12:29,505 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:12:29,505 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 15, 11] total 47 [2022-11-19 08:12:29,505 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1792200480] [2022-11-19 08:12:29,505 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:12:29,506 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2022-11-19 08:12:29,506 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:12:29,507 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2022-11-19 08:12:29,508 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=2462, Unknown=0, NotChecked=0, Total=2652 [2022-11-19 08:12:29,508 INFO L87 Difference]: Start difference. First operand 49 states and 59 transitions. Second operand has 47 states, 47 states have (on average 2.74468085106383) internal successors, (129), 47 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:12:34,691 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:12:34,691 INFO L93 Difference]: Finished difference Result 207 states and 260 transitions. [2022-11-19 08:12:34,699 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2022-11-19 08:12:34,699 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 2.74468085106383) internal successors, (129), 47 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 48 [2022-11-19 08:12:34,700 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:12:34,705 INFO L225 Difference]: With dead ends: 207 [2022-11-19 08:12:34,706 INFO L226 Difference]: Without dead ends: 143 [2022-11-19 08:12:34,711 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 87 SyntacticMatches, 52 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2838 ImplicationChecksByTransitivity, 7.7s TimeCoverageRelationStatistics Valid=561, Invalid=5445, Unknown=0, NotChecked=0, Total=6006 [2022-11-19 08:12:34,712 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 95 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 2040 mSolverCounterSat, 619 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 95 SdHoareTripleChecker+Valid, 92 SdHoareTripleChecker+Invalid, 2659 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 619 IncrementalHoareTripleChecker+Valid, 2040 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2022-11-19 08:12:34,713 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [95 Valid, 92 Invalid, 2659 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [619 Valid, 2040 Invalid, 0 Unknown, 0 Unchecked, 2.3s Time] [2022-11-19 08:12:34,714 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2022-11-19 08:12:34,756 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 111. [2022-11-19 08:12:34,756 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 110 states have (on average 1.2636363636363637) internal successors, (139), 110 states have internal predecessors, (139), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:12:34,757 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 139 transitions. [2022-11-19 08:12:34,758 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 139 transitions. Word has length 48 [2022-11-19 08:12:34,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:12:34,758 INFO L495 AbstractCegarLoop]: Abstraction has 111 states and 139 transitions. [2022-11-19 08:12:34,758 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 2.74468085106383) internal successors, (129), 47 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:12:34,758 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 139 transitions. [2022-11-19 08:12:34,759 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-11-19 08:12:34,759 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:12:34,759 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:12:34,766 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-19 08:12:34,965 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:12:34,966 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:12:34,966 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:12:34,966 INFO L85 PathProgramCache]: Analyzing trace with hash 242058191, now seen corresponding path program 7 times [2022-11-19 08:12:34,966 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:12:34,966 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [719685137] [2022-11-19 08:12:34,967 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:12:34,967 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:12:34,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:12:35,150 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 3 proven. 13 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2022-11-19 08:12:35,150 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:12:35,150 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [719685137] [2022-11-19 08:12:35,150 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [719685137] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:12:35,151 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2127774320] [2022-11-19 08:12:35,151 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 08:12:35,151 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:12:35,151 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:12:35,152 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:12:35,163 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-19 08:12:35,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:12:35,263 INFO L263 TraceCheckSpWp]: Trace formula consists of 273 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-19 08:12:35,265 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:12:35,356 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2022-11-19 08:12:35,356 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:12:35,439 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2022-11-19 08:12:35,439 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2127774320] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:12:35,439 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [942940500] [2022-11-19 08:12:35,441 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-11-19 08:12:35,441 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:12:35,441 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:12:35,441 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:12:35,441 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:12:35,464 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:12:35,496 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-19 08:12:35,496 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 08:12:35,507 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:12:35,508 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-19 08:12:35,529 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:12:35,531 INFO L350 Elim1Store]: Elim1 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 26 treesize of output 28 [2022-11-19 08:12:35,582 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:12:35,583 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 08:12:35,608 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-19 08:12:35,608 INFO L350 Elim1Store]: Elim1 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 234 treesize of output 233 [2022-11-19 08:12:35,691 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-19 08:12:35,933 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:12:36,608 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3863#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 08:12:36,608 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:12:36,608 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:12:36,608 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 17 [2022-11-19 08:12:36,608 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1431596911] [2022-11-19 08:12:36,609 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:12:36,609 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-11-19 08:12:36,609 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:12:36,609 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-11-19 08:12:36,610 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=369, Unknown=0, NotChecked=0, Total=462 [2022-11-19 08:12:36,610 INFO L87 Difference]: Start difference. First operand 111 states and 139 transitions. Second operand has 17 states, 17 states have (on average 2.3529411764705883) internal successors, (40), 17 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:12:36,843 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:12:36,844 INFO L93 Difference]: Finished difference Result 156 states and 201 transitions. [2022-11-19 08:12:36,844 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-19 08:12:36,844 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.3529411764705883) internal successors, (40), 17 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 50 [2022-11-19 08:12:36,844 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:12:36,845 INFO L225 Difference]: With dead ends: 156 [2022-11-19 08:12:36,845 INFO L226 Difference]: Without dead ends: 65 [2022-11-19 08:12:36,845 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 106 SyntacticMatches, 33 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 671 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=159, Invalid=543, Unknown=0, NotChecked=0, Total=702 [2022-11-19 08:12:36,846 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 126 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 158 mSolverCounterSat, 95 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 126 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 253 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 95 IncrementalHoareTripleChecker+Valid, 158 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-19 08:12:36,846 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [126 Valid, 11 Invalid, 253 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [95 Valid, 158 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-19 08:12:36,847 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2022-11-19 08:12:36,857 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 60. [2022-11-19 08:12:36,858 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 59 states have (on average 1.1864406779661016) internal successors, (70), 59 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:12:36,858 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 70 transitions. [2022-11-19 08:12:36,858 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 70 transitions. Word has length 50 [2022-11-19 08:12:36,859 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:12:36,859 INFO L495 AbstractCegarLoop]: Abstraction has 60 states and 70 transitions. [2022-11-19 08:12:36,859 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.3529411764705883) internal successors, (40), 17 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:12:36,859 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 70 transitions. [2022-11-19 08:12:36,860 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-11-19 08:12:36,860 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:12:36,860 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:12:36,867 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-19 08:12:37,063 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2022-11-19 08:12:37,063 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:12:37,063 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:12:37,064 INFO L85 PathProgramCache]: Analyzing trace with hash 1661922165, now seen corresponding path program 8 times [2022-11-19 08:12:37,064 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:12:37,064 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1138445494] [2022-11-19 08:12:37,064 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:12:37,064 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:12:37,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:12:45,770 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 2 proven. 108 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:12:45,770 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:12:45,770 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1138445494] [2022-11-19 08:12:45,770 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1138445494] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:12:45,770 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1405604272] [2022-11-19 08:12:45,770 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 08:12:45,771 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:12:45,771 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:12:45,772 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:12:45,774 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-19 08:12:45,908 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-19 08:12:45,908 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:12:45,913 WARN L261 TraceCheckSpWp]: Trace formula consists of 318 conjuncts, 183 conjunts are in the unsatisfiable core [2022-11-19 08:12:45,917 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:12:52,375 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-19 08:12:52,375 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 23 [2022-11-19 08:12:52,554 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 4 proven. 100 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-19 08:12:52,554 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:12:56,975 INFO L321 Elim1Store]: treesize reduction 78, result has 68.7 percent of original size [2022-11-19 08:12:56,975 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 70 treesize of output 183 [2022-11-19 08:12:57,576 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 104 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-19 08:12:57,576 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1405604272] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:12:57,577 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [831557567] [2022-11-19 08:12:57,579 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-11-19 08:12:57,579 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:12:57,579 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:12:57,579 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:12:57,580 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:12:57,603 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:12:57,628 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-19 08:12:57,628 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 08:12:57,642 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:12:57,671 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-19 08:12:57,671 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 08:12:57,704 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:12:57,705 INFO L350 Elim1Store]: Elim1 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 26 treesize of output 28 [2022-11-19 08:12:57,758 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:12:57,759 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 08:12:57,783 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-19 08:12:57,784 INFO L350 Elim1Store]: Elim1 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 234 treesize of output 233 [2022-11-19 08:12:57,861 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-19 08:12:58,101 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:13:00,214 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4716#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |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___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 08:13:00,214 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:13:00,214 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:13:00,214 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 16, 16] total 71 [2022-11-19 08:13:00,214 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [982747745] [2022-11-19 08:13:00,215 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:13:00,215 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 71 states [2022-11-19 08:13:00,215 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:13:00,216 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2022-11-19 08:13:00,217 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=324, Invalid=5376, Unknown=0, NotChecked=0, Total=5700 [2022-11-19 08:13:00,218 INFO L87 Difference]: Start difference. First operand 60 states and 70 transitions. Second operand has 71 states, 71 states have (on average 2.3661971830985915) internal successors, (168), 71 states have internal predecessors, (168), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:13:07,526 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:13:07,526 INFO L93 Difference]: Finished difference Result 155 states and 188 transitions. [2022-11-19 08:13:07,527 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2022-11-19 08:13:07,527 INFO L78 Accepts]: Start accepts. Automaton has has 71 states, 71 states have (on average 2.3661971830985915) internal successors, (168), 71 states have internal predecessors, (168), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 59 [2022-11-19 08:13:07,527 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:13:07,528 INFO L225 Difference]: With dead ends: 155 [2022-11-19 08:13:07,528 INFO L226 Difference]: Without dead ends: 152 [2022-11-19 08:13:07,531 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 279 GetRequests, 108 SyntacticMatches, 53 SemanticMatches, 118 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5943 ImplicationChecksByTransitivity, 19.4s TimeCoverageRelationStatistics Valid=897, Invalid=13383, Unknown=0, NotChecked=0, Total=14280 [2022-11-19 08:13:07,532 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 15 mSDsluCounter, 86 mSDsCounter, 0 mSdLazyCounter, 1025 mSolverCounterSat, 147 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 89 SdHoareTripleChecker+Invalid, 1826 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 147 IncrementalHoareTripleChecker+Valid, 1025 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 654 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-11-19 08:13:07,533 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 89 Invalid, 1826 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [147 Valid, 1025 Invalid, 0 Unknown, 654 Unchecked, 1.1s Time] [2022-11-19 08:13:07,533 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2022-11-19 08:13:07,573 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 120. [2022-11-19 08:13:07,573 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 120 states, 119 states have (on average 1.218487394957983) internal successors, (145), 119 states have internal predecessors, (145), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:13:07,574 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 145 transitions. [2022-11-19 08:13:07,574 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 145 transitions. Word has length 59 [2022-11-19 08:13:07,574 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:13:07,575 INFO L495 AbstractCegarLoop]: Abstraction has 120 states and 145 transitions. [2022-11-19 08:13:07,575 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 71 states, 71 states have (on average 2.3661971830985915) internal successors, (168), 71 states have internal predecessors, (168), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:13:07,575 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 145 transitions. [2022-11-19 08:13:07,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2022-11-19 08:13:07,576 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:13:07,576 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:13:07,587 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2022-11-19 08:13:07,782 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-11-19 08:13:07,782 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:13:07,783 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:13:07,783 INFO L85 PathProgramCache]: Analyzing trace with hash -352141007, now seen corresponding path program 9 times [2022-11-19 08:13:07,783 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:13:07,783 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [542358539] [2022-11-19 08:13:07,783 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:13:07,783 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:13:07,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:13:08,018 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 11 proven. 14 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2022-11-19 08:13:08,019 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:13:08,019 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [542358539] [2022-11-19 08:13:08,019 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [542358539] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:13:08,019 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2075983531] [2022-11-19 08:13:08,019 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 08:13:08,019 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:13:08,019 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:13:08,020 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:13:08,043 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-19 08:13:08,128 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 08:13:08,128 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:13:08,130 INFO L263 TraceCheckSpWp]: Trace formula consists of 245 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-19 08:13:08,135 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:13:08,327 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2022-11-19 08:13:08,327 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:13:08,487 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2022-11-19 08:13:08,487 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2075983531] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:13:08,488 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [184945462] [2022-11-19 08:13:08,490 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-11-19 08:13:08,490 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:13:08,490 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:13:08,490 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:13:08,490 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:13:08,508 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:13:08,537 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-19 08:13:08,537 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 08:13:08,551 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:13:08,584 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-19 08:13:08,584 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 08:13:08,609 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:13:08,610 INFO L350 Elim1Store]: Elim1 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 31 treesize of output 33 [2022-11-19 08:13:08,660 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:13:08,663 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:13:08,677 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-19 08:13:08,677 INFO L350 Elim1Store]: Elim1 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 244 treesize of output 232 [2022-11-19 08:13:08,723 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-19 08:13:08,949 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:13:10,004 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5726#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |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___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 08:13:10,004 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:13:10,004 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:13:10,004 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 24 [2022-11-19 08:13:10,004 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1817262955] [2022-11-19 08:13:10,004 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:13:10,005 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-11-19 08:13:10,005 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:13:10,006 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-11-19 08:13:10,006 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=676, Unknown=0, NotChecked=0, Total=812 [2022-11-19 08:13:10,006 INFO L87 Difference]: Start difference. First operand 120 states and 145 transitions. Second operand has 24 states, 24 states have (on average 2.0416666666666665) internal successors, (49), 24 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:13:10,796 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:13:10,796 INFO L93 Difference]: Finished difference Result 301 states and 365 transitions. [2022-11-19 08:13:10,797 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-11-19 08:13:10,797 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.0416666666666665) internal successors, (49), 24 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 60 [2022-11-19 08:13:10,798 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:13:10,799 INFO L225 Difference]: With dead ends: 301 [2022-11-19 08:13:10,800 INFO L226 Difference]: Without dead ends: 117 [2022-11-19 08:13:10,802 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 118 SyntacticMatches, 46 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1262 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=267, Invalid=1215, Unknown=0, NotChecked=0, Total=1482 [2022-11-19 08:13:10,802 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 80 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 428 mSolverCounterSat, 495 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 80 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 923 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 495 IncrementalHoareTripleChecker+Valid, 428 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-19 08:13:10,803 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [80 Valid, 17 Invalid, 923 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [495 Valid, 428 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-19 08:13:10,803 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2022-11-19 08:13:10,835 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 110. [2022-11-19 08:13:10,835 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 110 states, 109 states have (on average 1.1743119266055047) internal successors, (128), 109 states have internal predecessors, (128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:13:10,836 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 128 transitions. [2022-11-19 08:13:10,836 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 128 transitions. Word has length 60 [2022-11-19 08:13:10,836 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:13:10,836 INFO L495 AbstractCegarLoop]: Abstraction has 110 states and 128 transitions. [2022-11-19 08:13:10,836 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 2.0416666666666665) internal successors, (49), 24 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:13:10,837 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 128 transitions. [2022-11-19 08:13:10,837 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-11-19 08:13:10,837 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:13:10,837 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:13:10,848 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-19 08:13:11,043 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:13:11,043 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:13:11,043 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:13:11,044 INFO L85 PathProgramCache]: Analyzing trace with hash 1361541262, now seen corresponding path program 10 times [2022-11-19 08:13:11,044 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:13:11,044 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1073948120] [2022-11-19 08:13:11,044 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:13:11,044 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:13:11,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:13:11,280 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 6 proven. 19 refuted. 0 times theorem prover too weak. 95 trivial. 0 not checked. [2022-11-19 08:13:11,280 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:13:11,280 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1073948120] [2022-11-19 08:13:11,281 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1073948120] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:13:11,281 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1320165105] [2022-11-19 08:13:11,281 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 08:13:11,281 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:13:11,281 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:13:11,283 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:13:11,320 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-19 08:13:11,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:13:11,413 INFO L263 TraceCheckSpWp]: Trace formula consists of 332 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-19 08:13:11,415 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:13:11,532 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 95 trivial. 0 not checked. [2022-11-19 08:13:11,532 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:13:11,642 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 95 trivial. 0 not checked. [2022-11-19 08:13:11,642 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1320165105] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:13:11,643 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [682391292] [2022-11-19 08:13:11,644 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-11-19 08:13:11,645 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:13:11,645 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:13:11,645 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:13:11,645 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:13:11,661 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:13:11,689 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-19 08:13:11,689 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 08:13:11,702 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:13:11,734 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-19 08:13:11,734 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 08:13:11,759 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:13:11,760 INFO L350 Elim1Store]: Elim1 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 26 treesize of output 28 [2022-11-19 08:13:11,811 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:13:11,813 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 08:13:11,841 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-19 08:13:11,842 INFO L350 Elim1Store]: Elim1 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 234 treesize of output 233 [2022-11-19 08:13:11,927 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-19 08:13:12,162 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:13:12,863 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6934#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 08:13:12,863 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:13:12,863 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:13:12,863 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2022-11-19 08:13:12,863 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1680346373] [2022-11-19 08:13:12,863 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:13:12,864 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-11-19 08:13:12,864 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:13:12,864 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-11-19 08:13:12,864 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=481, Unknown=0, NotChecked=0, Total=600 [2022-11-19 08:13:12,865 INFO L87 Difference]: Start difference. First operand 110 states and 128 transitions. Second operand has 20 states, 20 states have (on average 2.15) internal successors, (43), 20 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:13:13,151 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:13:13,151 INFO L93 Difference]: Finished difference Result 114 states and 132 transitions. [2022-11-19 08:13:13,152 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-19 08:13:13,152 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.15) internal successors, (43), 20 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 61 [2022-11-19 08:13:13,152 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:13:13,152 INFO L225 Difference]: With dead ends: 114 [2022-11-19 08:13:13,153 INFO L226 Difference]: Without dead ends: 71 [2022-11-19 08:13:13,153 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 200 GetRequests, 141 SyntacticMatches, 30 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 773 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=213, Invalid=717, Unknown=0, NotChecked=0, Total=930 [2022-11-19 08:13:13,154 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 244 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 175 mSolverCounterSat, 168 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 244 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 343 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 168 IncrementalHoareTripleChecker+Valid, 175 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-19 08:13:13,154 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [244 Valid, 13 Invalid, 343 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [168 Valid, 175 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-19 08:13:13,155 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2022-11-19 08:13:13,165 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 71. [2022-11-19 08:13:13,165 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 70 states have (on average 1.1571428571428573) internal successors, (81), 70 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) [2022-11-19 08:13:13,166 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 81 transitions. [2022-11-19 08:13:13,166 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 81 transitions. Word has length 61 [2022-11-19 08:13:13,166 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:13:13,166 INFO L495 AbstractCegarLoop]: Abstraction has 71 states and 81 transitions. [2022-11-19 08:13:13,167 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 2.15) internal successors, (43), 20 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:13:13,167 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 81 transitions. [2022-11-19 08:13:13,167 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2022-11-19 08:13:13,167 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:13:13,167 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:13:13,173 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-19 08:13:13,368 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-11-19 08:13:13,369 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:13:13,369 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:13:13,369 INFO L85 PathProgramCache]: Analyzing trace with hash 458943518, now seen corresponding path program 11 times [2022-11-19 08:13:13,370 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:13:13,370 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1265520654] [2022-11-19 08:13:13,370 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:13:13,370 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:13:13,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:13:25,947 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 7 proven. 158 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:13:25,948 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:13:25,948 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1265520654] [2022-11-19 08:13:25,948 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1265520654] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:13:25,948 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [31871339] [2022-11-19 08:13:25,948 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 08:13:25,948 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:13:25,948 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:13:25,949 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:13:25,951 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-19 08:13:26,094 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-19 08:13:26,095 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:13:26,101 WARN L261 TraceCheckSpWp]: Trace formula consists of 377 conjuncts, 227 conjunts are in the unsatisfiable core [2022-11-19 08:13:26,131 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:13:26,213 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2022-11-19 08:13:31,086 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:13:31,104 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-19 08:13:31,104 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 73 treesize of output 55 [2022-11-19 08:13:31,313 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 5 proven. 150 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-19 08:13:31,313 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:13:37,025 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 70 treesize of output 62 [2022-11-19 08:13:37,051 INFO L321 Elim1Store]: treesize reduction 44, result has 17.0 percent of original size [2022-11-19 08:13:37,052 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 618 treesize of output 418 [2022-11-19 08:13:37,363 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-19 08:13:37,363 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [31871339] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:13:37,363 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [825028247] [2022-11-19 08:13:37,365 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-11-19 08:13:37,365 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:13:37,366 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:13:37,366 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:13:37,366 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:13:37,387 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:13:37,415 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-19 08:13:37,415 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 08:13:37,425 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:13:37,426 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-19 08:13:37,447 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:13:37,448 INFO L350 Elim1Store]: Elim1 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 31 treesize of output 33 [2022-11-19 08:13:37,487 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:13:37,489 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:13:37,502 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-19 08:13:37,502 INFO L350 Elim1Store]: Elim1 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 244 treesize of output 232 [2022-11-19 08:13:37,550 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-19 08:13:37,776 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:13:42,314 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7798#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |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___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 08:13:42,315 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:13:42,315 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:13:42,315 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 18, 17] total 76 [2022-11-19 08:13:42,315 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1310523439] [2022-11-19 08:13:42,315 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:13:42,316 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 76 states [2022-11-19 08:13:42,316 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:13:42,317 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2022-11-19 08:13:42,318 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=354, Invalid=6126, Unknown=0, NotChecked=0, Total=6480 [2022-11-19 08:13:42,319 INFO L87 Difference]: Start difference. First operand 71 states and 81 transitions. Second operand has 76 states, 76 states have (on average 2.5921052631578947) internal successors, (197), 76 states have internal predecessors, (197), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:13:51,335 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:13:51,335 INFO L93 Difference]: Finished difference Result 144 states and 167 transitions. [2022-11-19 08:13:51,335 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2022-11-19 08:13:51,336 INFO L78 Accepts]: Start accepts. Automaton has has 76 states, 76 states have (on average 2.5921052631578947) internal successors, (197), 76 states have internal predecessors, (197), 0 states have call successors, (0), 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 70 [2022-11-19 08:13:51,336 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:13:51,337 INFO L225 Difference]: With dead ends: 144 [2022-11-19 08:13:51,337 INFO L226 Difference]: Without dead ends: 141 [2022-11-19 08:13:51,340 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 336 GetRequests, 121 SyntacticMatches, 88 SemanticMatches, 127 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7727 ImplicationChecksByTransitivity, 24.1s TimeCoverageRelationStatistics Valid=1005, Invalid=15507, Unknown=0, NotChecked=0, Total=16512 [2022-11-19 08:13:51,341 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 18 mSDsluCounter, 84 mSDsCounter, 0 mSdLazyCounter, 830 mSolverCounterSat, 139 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 87 SdHoareTripleChecker+Invalid, 1473 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 139 IncrementalHoareTripleChecker+Valid, 830 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 504 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-19 08:13:51,341 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 87 Invalid, 1473 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [139 Valid, 830 Invalid, 0 Unknown, 504 Unchecked, 0.8s Time] [2022-11-19 08:13:51,342 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2022-11-19 08:13:51,378 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 103. [2022-11-19 08:13:51,378 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 102 states have (on average 1.1666666666666667) internal successors, (119), 102 states have internal predecessors, (119), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:13:51,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 119 transitions. [2022-11-19 08:13:51,379 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 119 transitions. Word has length 70 [2022-11-19 08:13:51,379 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:13:51,379 INFO L495 AbstractCegarLoop]: Abstraction has 103 states and 119 transitions. [2022-11-19 08:13:51,379 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 76 states, 76 states have (on average 2.5921052631578947) internal successors, (197), 76 states have internal predecessors, (197), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:13:51,380 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 119 transitions. [2022-11-19 08:13:51,380 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2022-11-19 08:13:51,380 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:13:51,380 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:13:51,385 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-11-19 08:13:51,580 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:13:51,581 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:13:51,581 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:13:51,581 INFO L85 PathProgramCache]: Analyzing trace with hash 89370822, now seen corresponding path program 12 times [2022-11-19 08:13:51,582 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:13:51,582 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [812230246] [2022-11-19 08:13:51,582 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:13:51,582 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:13:51,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:13:51,860 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 16 proven. 20 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2022-11-19 08:13:51,860 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:13:51,860 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [812230246] [2022-11-19 08:13:51,860 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [812230246] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:13:51,860 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [588943815] [2022-11-19 08:13:51,860 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 08:13:51,860 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:13:51,861 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:13:51,863 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:13:51,887 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-19 08:13:51,985 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 08:13:51,985 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:13:51,987 INFO L263 TraceCheckSpWp]: Trace formula consists of 295 conjuncts, 14 conjunts are in the unsatisfiable core [2022-11-19 08:13:51,989 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:13:52,236 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2022-11-19 08:13:52,236 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:13:52,402 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2022-11-19 08:13:52,402 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [588943815] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:13:52,403 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [822769207] [2022-11-19 08:13:52,404 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-11-19 08:13:52,404 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:13:52,405 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:13:52,405 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:13:52,405 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:13:52,427 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:13:52,453 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-19 08:13:52,453 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 08:13:52,464 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:13:52,465 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-19 08:13:52,485 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:13:52,486 INFO L350 Elim1Store]: Elim1 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 31 treesize of output 33 [2022-11-19 08:13:52,536 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:13:52,538 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:13:52,550 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-19 08:13:52,551 INFO L350 Elim1Store]: Elim1 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 244 treesize of output 232 [2022-11-19 08:13:52,591 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-19 08:13:52,791 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:13:53,958 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8839#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |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___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 08:13:53,958 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:13:53,959 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:13:53,959 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 28 [2022-11-19 08:13:53,959 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [576517566] [2022-11-19 08:13:53,959 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:13:53,959 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-11-19 08:13:53,959 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:13:53,960 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-11-19 08:13:53,960 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=882, Unknown=0, NotChecked=0, Total=1056 [2022-11-19 08:13:53,960 INFO L87 Difference]: Start difference. First operand 103 states and 119 transitions. Second operand has 28 states, 28 states have (on average 1.8928571428571428) internal successors, (53), 28 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:13:54,889 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:13:54,889 INFO L93 Difference]: Finished difference Result 322 states and 378 transitions. [2022-11-19 08:13:54,889 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-11-19 08:13:54,890 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.8928571428571428) internal successors, (53), 28 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 71 [2022-11-19 08:13:54,890 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:13:54,890 INFO L225 Difference]: With dead ends: 322 [2022-11-19 08:13:54,890 INFO L226 Difference]: Without dead ends: 118 [2022-11-19 08:13:54,891 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 238 GetRequests, 146 SyntacticMatches, 49 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1634 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=349, Invalid=1631, Unknown=0, NotChecked=0, Total=1980 [2022-11-19 08:13:54,892 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 150 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 608 mSolverCounterSat, 701 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 150 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 1309 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 701 IncrementalHoareTripleChecker+Valid, 608 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-19 08:13:54,892 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [150 Valid, 17 Invalid, 1309 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [701 Valid, 608 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-19 08:13:54,893 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2022-11-19 08:13:54,921 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 111. [2022-11-19 08:13:54,921 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 110 states have (on average 1.1454545454545455) internal successors, (126), 110 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:13:54,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 126 transitions. [2022-11-19 08:13:54,922 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 126 transitions. Word has length 71 [2022-11-19 08:13:54,922 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:13:54,922 INFO L495 AbstractCegarLoop]: Abstraction has 111 states and 126 transitions. [2022-11-19 08:13:54,922 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 1.8928571428571428) internal successors, (53), 28 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:13:54,922 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 126 transitions. [2022-11-19 08:13:54,923 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2022-11-19 08:13:54,923 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:13:54,923 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:13:54,931 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-19 08:13:55,127 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-11-19 08:13:55,127 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:13:55,127 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:13:55,128 INFO L85 PathProgramCache]: Analyzing trace with hash -1719315062, now seen corresponding path program 13 times [2022-11-19 08:13:55,128 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:13:55,130 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [466389274] [2022-11-19 08:13:55,130 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:13:55,130 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:13:55,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:13:55,402 INFO L134 CoverageAnalysis]: Checked inductivity of 195 backedges. 10 proven. 26 refuted. 0 times theorem prover too weak. 159 trivial. 0 not checked. [2022-11-19 08:13:55,402 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:13:55,402 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [466389274] [2022-11-19 08:13:55,403 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [466389274] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:13:55,403 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1998250284] [2022-11-19 08:13:55,403 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 08:13:55,403 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:13:55,403 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:13:55,404 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:13:55,427 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-19 08:13:55,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:13:55,545 INFO L263 TraceCheckSpWp]: Trace formula consists of 406 conjuncts, 14 conjunts are in the unsatisfiable core [2022-11-19 08:13:55,547 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:13:55,706 INFO L134 CoverageAnalysis]: Checked inductivity of 195 backedges. 15 proven. 21 refuted. 0 times theorem prover too weak. 159 trivial. 0 not checked. [2022-11-19 08:13:55,707 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:13:55,858 INFO L134 CoverageAnalysis]: Checked inductivity of 195 backedges. 15 proven. 21 refuted. 0 times theorem prover too weak. 159 trivial. 0 not checked. [2022-11-19 08:13:55,858 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1998250284] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:13:55,858 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2033026335] [2022-11-19 08:13:55,859 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-11-19 08:13:55,859 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:13:55,860 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:13:55,860 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:13:55,860 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:13:55,874 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:13:55,899 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-19 08:13:55,899 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 08:13:55,915 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:13:55,941 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-19 08:13:55,941 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 08:13:55,963 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:13:55,964 INFO L350 Elim1Store]: Elim1 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 31 treesize of output 33 [2022-11-19 08:13:56,011 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:13:56,013 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:13:56,025 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-19 08:13:56,026 INFO L350 Elim1Store]: Elim1 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 244 treesize of output 232 [2022-11-19 08:13:56,066 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-19 08:13:56,270 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:13:56,805 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10182#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |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___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 08:13:56,805 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:13:56,805 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:13:56,805 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 23 [2022-11-19 08:13:56,807 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1369507581] [2022-11-19 08:13:56,807 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:13:56,811 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-11-19 08:13:56,811 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:13:56,811 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-11-19 08:13:56,811 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=607, Unknown=0, NotChecked=0, Total=756 [2022-11-19 08:13:56,811 INFO L87 Difference]: Start difference. First operand 111 states and 126 transitions. Second operand has 23 states, 23 states have (on average 2.0) internal successors, (46), 23 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:13:57,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:13:57,134 INFO L93 Difference]: Finished difference Result 115 states and 130 transitions. [2022-11-19 08:13:57,134 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-11-19 08:13:57,134 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.0) internal successors, (46), 23 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 75 [2022-11-19 08:13:57,135 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:13:57,135 INFO L225 Difference]: With dead ends: 115 [2022-11-19 08:13:57,135 INFO L226 Difference]: Without dead ends: 82 [2022-11-19 08:13:57,136 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 186 SyntacticMatches, 26 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 827 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=276, Invalid=914, Unknown=0, NotChecked=0, Total=1190 [2022-11-19 08:13:57,136 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 279 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 238 mSolverCounterSat, 118 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 279 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 356 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 118 IncrementalHoareTripleChecker+Valid, 238 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-19 08:13:57,137 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [279 Valid, 17 Invalid, 356 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [118 Valid, 238 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-19 08:13:57,137 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2022-11-19 08:13:57,171 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 82. [2022-11-19 08:13:57,171 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 81 states have (on average 1.1358024691358024) internal successors, (92), 81 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:13:57,172 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 92 transitions. [2022-11-19 08:13:57,172 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 92 transitions. Word has length 75 [2022-11-19 08:13:57,172 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:13:57,172 INFO L495 AbstractCegarLoop]: Abstraction has 82 states and 92 transitions. [2022-11-19 08:13:57,172 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 2.0) internal successors, (46), 23 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:13:57,173 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 92 transitions. [2022-11-19 08:13:57,173 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2022-11-19 08:13:57,173 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:13:57,173 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:13:57,187 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2022-11-19 08:13:57,379 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-11-19 08:13:57,379 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:13:57,380 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:13:57,380 INFO L85 PathProgramCache]: Analyzing trace with hash -1024746859, now seen corresponding path program 14 times [2022-11-19 08:13:57,380 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:13:57,380 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2012338100] [2022-11-19 08:13:57,380 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:13:57,380 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:13:57,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:14:15,148 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 15 proven. 216 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:14:15,149 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:14:15,149 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2012338100] [2022-11-19 08:14:15,149 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2012338100] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:14:15,149 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1830476735] [2022-11-19 08:14:15,149 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 08:14:15,150 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:14:15,150 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:14:15,151 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:14:15,153 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-19 08:14:15,375 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-19 08:14:15,376 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:14:15,382 WARN L261 TraceCheckSpWp]: Trace formula consists of 436 conjuncts, 270 conjunts are in the unsatisfiable core [2022-11-19 08:14:15,389 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:14:15,491 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2022-11-19 08:14:30,126 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:14:30,126 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 08:14:30,127 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 08:14:30,128 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:14:30,129 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:14:30,132 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 08:14:30,133 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 08:14:30,189 INFO L321 Elim1Store]: treesize reduction 78, result has 37.6 percent of original size [2022-11-19 08:14:30,190 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 3 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 125 treesize of output 71 [2022-11-19 08:14:30,505 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 6 proven. 210 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-19 08:14:30,505 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:14:43,616 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 65 treesize of output 57 [2022-11-19 08:14:43,650 INFO L321 Elim1Store]: treesize reduction 32, result has 22.0 percent of original size [2022-11-19 08:14:43,651 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 494 treesize of output 334 [2022-11-19 08:14:43,990 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 221 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-19 08:14:43,990 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1830476735] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:14:43,991 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [627663550] [2022-11-19 08:14:43,992 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-11-19 08:14:43,992 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:14:43,993 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:14:43,993 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:14:43,993 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:14:44,009 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:14:44,033 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-19 08:14:44,034 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 08:14:44,044 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:14:44,071 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-19 08:14:44,071 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 08:14:44,104 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:14:44,105 INFO L350 Elim1Store]: Elim1 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 31 treesize of output 33 [2022-11-19 08:14:44,146 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:14:44,148 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:14:44,161 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-19 08:14:44,161 INFO L350 Elim1Store]: Elim1 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 244 treesize of output 232 [2022-11-19 08:14:44,205 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-19 08:14:44,424 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:14:52,661 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11196#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 08:14:52,661 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:14:52,662 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:14:52,662 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [66, 37, 39] total 134 [2022-11-19 08:14:52,662 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [896916318] [2022-11-19 08:14:52,662 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:14:52,663 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 134 states [2022-11-19 08:14:52,663 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:14:52,663 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 134 interpolants. [2022-11-19 08:14:52,665 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1036, Invalid=18145, Unknown=1, NotChecked=0, Total=19182 [2022-11-19 08:14:52,665 INFO L87 Difference]: Start difference. First operand 82 states and 92 transitions. Second operand has 134 states, 134 states have (on average 1.7238805970149254) internal successors, (231), 134 states have internal predecessors, (231), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:15:22,398 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:15:22,398 INFO L93 Difference]: Finished difference Result 225 states and 259 transitions. [2022-11-19 08:15:22,398 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 116 states. [2022-11-19 08:15:22,399 INFO L78 Accepts]: Start accepts. Automaton has has 134 states, 134 states have (on average 1.7238805970149254) internal successors, (231), 134 states have internal predecessors, (231), 0 states have call successors, (0), 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 81 [2022-11-19 08:15:22,399 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:15:22,400 INFO L225 Difference]: With dead ends: 225 [2022-11-19 08:15:22,401 INFO L226 Difference]: Without dead ends: 221 [2022-11-19 08:15:22,406 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 419 GetRequests, 117 SyntacticMatches, 72 SemanticMatches, 230 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20766 ImplicationChecksByTransitivity, 66.6s TimeCoverageRelationStatistics Valid=2620, Invalid=50971, Unknown=1, NotChecked=0, Total=53592 [2022-11-19 08:15:22,407 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 24 mSDsluCounter, 120 mSDsCounter, 0 mSdLazyCounter, 711 mSolverCounterSat, 131 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 123 SdHoareTripleChecker+Invalid, 1464 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 131 IncrementalHoareTripleChecker+Valid, 711 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 622 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-19 08:15:22,407 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [24 Valid, 123 Invalid, 1464 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [131 Valid, 711 Invalid, 0 Unknown, 622 Unchecked, 0.8s Time] [2022-11-19 08:15:22,408 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 221 states. [2022-11-19 08:15:22,485 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 221 to 150. [2022-11-19 08:15:22,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 150 states, 149 states have (on average 1.1610738255033557) internal successors, (173), 149 states have internal predecessors, (173), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:15:22,485 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 173 transitions. [2022-11-19 08:15:22,486 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 173 transitions. Word has length 81 [2022-11-19 08:15:22,486 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:15:22,486 INFO L495 AbstractCegarLoop]: Abstraction has 150 states and 173 transitions. [2022-11-19 08:15:22,486 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 134 states, 134 states have (on average 1.7238805970149254) internal successors, (231), 134 states have internal predecessors, (231), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:15:22,487 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 173 transitions. [2022-11-19 08:15:22,487 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2022-11-19 08:15:22,487 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:15:22,487 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:15:22,492 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-11-19 08:15:22,687 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-11-19 08:15:22,688 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:15:22,688 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:15:22,688 INFO L85 PathProgramCache]: Analyzing trace with hash 1282657873, now seen corresponding path program 15 times [2022-11-19 08:15:22,688 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:15:22,688 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [145020110] [2022-11-19 08:15:22,689 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:15:22,689 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:15:22,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:15:23,019 INFO L134 CoverageAnalysis]: Checked inductivity of 238 backedges. 22 proven. 27 refuted. 0 times theorem prover too weak. 189 trivial. 0 not checked. [2022-11-19 08:15:23,020 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:15:23,020 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [145020110] [2022-11-19 08:15:23,020 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [145020110] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:15:23,020 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2007458619] [2022-11-19 08:15:23,020 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 08:15:23,020 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:15:23,021 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:15:23,023 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:15:23,043 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-19 08:15:23,160 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 08:15:23,160 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:15:23,162 INFO L263 TraceCheckSpWp]: Trace formula consists of 345 conjuncts, 16 conjunts are in the unsatisfiable core [2022-11-19 08:15:23,164 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:15:23,484 INFO L134 CoverageAnalysis]: Checked inductivity of 238 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 189 trivial. 0 not checked. [2022-11-19 08:15:23,484 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:15:23,718 INFO L134 CoverageAnalysis]: Checked inductivity of 238 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 189 trivial. 0 not checked. [2022-11-19 08:15:23,718 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2007458619] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:15:23,718 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [287362801] [2022-11-19 08:15:23,720 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-11-19 08:15:23,720 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:15:23,720 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:15:23,720 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:15:23,720 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:15:23,745 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:15:23,773 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-19 08:15:23,773 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 08:15:23,789 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:15:23,791 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-19 08:15:23,809 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:15:23,810 INFO L350 Elim1Store]: Elim1 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 26 treesize of output 28 [2022-11-19 08:15:23,860 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:15:23,861 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 08:15:23,886 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-19 08:15:23,887 INFO L350 Elim1Store]: Elim1 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 234 treesize of output 233 [2022-11-19 08:15:23,999 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-19 08:15:24,203 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:15:25,806 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12646#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |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___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 08:15:25,806 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:15:25,806 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:15:25,806 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 32 [2022-11-19 08:15:25,807 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1114797969] [2022-11-19 08:15:25,807 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:15:25,807 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-11-19 08:15:25,807 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:15:25,808 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-11-19 08:15:25,808 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=217, Invalid=1115, Unknown=0, NotChecked=0, Total=1332 [2022-11-19 08:15:25,808 INFO L87 Difference]: Start difference. First operand 150 states and 173 transitions. Second operand has 32 states, 32 states have (on average 1.78125) internal successors, (57), 32 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:15:27,042 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:15:27,043 INFO L93 Difference]: Finished difference Result 424 states and 491 transitions. [2022-11-19 08:15:27,043 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2022-11-19 08:15:27,043 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.78125) internal successors, (57), 32 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 82 [2022-11-19 08:15:27,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:15:27,045 INFO L225 Difference]: With dead ends: 424 [2022-11-19 08:15:27,045 INFO L226 Difference]: Without dead ends: 180 [2022-11-19 08:15:27,046 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 275 GetRequests, 162 SyntacticMatches, 64 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2396 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=442, Invalid=2108, Unknown=0, NotChecked=0, Total=2550 [2022-11-19 08:15:27,046 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 130 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 701 mSolverCounterSat, 797 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 130 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 1498 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 797 IncrementalHoareTripleChecker+Valid, 701 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-19 08:15:27,047 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [130 Valid, 27 Invalid, 1498 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [797 Valid, 701 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-19 08:15:27,047 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2022-11-19 08:15:27,144 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 173. [2022-11-19 08:15:27,144 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 173 states, 172 states have (on average 1.1337209302325582) internal successors, (195), 172 states have internal predecessors, (195), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:15:27,145 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 195 transitions. [2022-11-19 08:15:27,145 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 195 transitions. Word has length 82 [2022-11-19 08:15:27,145 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:15:27,145 INFO L495 AbstractCegarLoop]: Abstraction has 173 states and 195 transitions. [2022-11-19 08:15:27,145 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 1.78125) internal successors, (57), 32 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:15:27,145 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 195 transitions. [2022-11-19 08:15:27,146 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2022-11-19 08:15:27,146 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:15:27,146 INFO L195 NwaCegarLoop]: trace histogram [9, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:15:27,156 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2022-11-19 08:15:27,352 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-11-19 08:15:27,352 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:15:27,352 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:15:27,352 INFO L85 PathProgramCache]: Analyzing trace with hash 1470944046, now seen corresponding path program 16 times [2022-11-19 08:15:27,353 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:15:27,353 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [303132607] [2022-11-19 08:15:27,353 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:15:27,353 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:15:27,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:15:27,622 INFO L134 CoverageAnalysis]: Checked inductivity of 262 backedges. 15 proven. 34 refuted. 0 times theorem prover too weak. 213 trivial. 0 not checked. [2022-11-19 08:15:27,623 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:15:27,623 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [303132607] [2022-11-19 08:15:27,623 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [303132607] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:15:27,623 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [510151906] [2022-11-19 08:15:27,623 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 08:15:27,623 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:15:27,623 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:15:27,624 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:15:27,626 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-11-19 08:15:27,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:15:27,762 INFO L263 TraceCheckSpWp]: Trace formula consists of 460 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-19 08:15:27,763 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:15:28,042 INFO L134 CoverageAnalysis]: Checked inductivity of 262 backedges. 44 proven. 28 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2022-11-19 08:15:28,042 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:15:28,315 INFO L134 CoverageAnalysis]: Checked inductivity of 262 backedges. 44 proven. 28 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2022-11-19 08:15:28,315 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [510151906] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:15:28,315 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [613468580] [2022-11-19 08:15:28,317 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-11-19 08:15:28,317 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:15:28,317 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:15:28,317 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:15:28,317 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:15:28,335 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:15:28,358 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-19 08:15:28,359 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 08:15:28,375 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:15:28,400 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-19 08:15:28,401 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 08:15:28,418 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:15:28,420 INFO L350 Elim1Store]: Elim1 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 31 treesize of output 33 [2022-11-19 08:15:28,465 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:15:28,467 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:15:28,481 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-19 08:15:28,481 INFO L350 Elim1Store]: Elim1 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 244 treesize of output 232 [2022-11-19 08:15:28,522 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-19 08:15:28,739 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:15:29,642 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '14399#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |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___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 08:15:29,643 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:15:29,643 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:15:29,643 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 18, 18] total 41 [2022-11-19 08:15:29,643 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1707694114] [2022-11-19 08:15:29,643 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:15:29,643 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2022-11-19 08:15:29,643 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:15:29,644 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2022-11-19 08:15:29,644 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=276, Invalid=1794, Unknown=0, NotChecked=0, Total=2070 [2022-11-19 08:15:29,644 INFO L87 Difference]: Start difference. First operand 173 states and 195 transitions. Second operand has 41 states, 41 states have (on average 1.6341463414634145) internal successors, (67), 41 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:15:30,995 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:15:30,995 INFO L93 Difference]: Finished difference Result 357 states and 416 transitions. [2022-11-19 08:15:30,995 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-11-19 08:15:30,995 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.6341463414634145) internal successors, (67), 41 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 85 [2022-11-19 08:15:30,996 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:15:30,996 INFO L225 Difference]: With dead ends: 357 [2022-11-19 08:15:30,996 INFO L226 Difference]: Without dead ends: 202 [2022-11-19 08:15:30,997 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 294 GetRequests, 204 SyntacticMatches, 22 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1804 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=718, Invalid=4112, Unknown=0, NotChecked=0, Total=4830 [2022-11-19 08:15:30,997 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 611 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 738 mSolverCounterSat, 659 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 611 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 1397 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 659 IncrementalHoareTripleChecker+Valid, 738 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-19 08:15:30,998 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [611 Valid, 15 Invalid, 1397 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [659 Valid, 738 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-19 08:15:30,998 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2022-11-19 08:15:31,112 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 174. [2022-11-19 08:15:31,113 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 174 states, 173 states have (on average 1.069364161849711) internal successors, (185), 173 states have internal predecessors, (185), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:15:31,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 185 transitions. [2022-11-19 08:15:31,113 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 185 transitions. Word has length 85 [2022-11-19 08:15:31,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:15:31,114 INFO L495 AbstractCegarLoop]: Abstraction has 174 states and 185 transitions. [2022-11-19 08:15:31,114 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 1.6341463414634145) internal successors, (67), 41 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:15:31,114 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 185 transitions. [2022-11-19 08:15:31,114 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2022-11-19 08:15:31,115 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:15:31,115 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:15:31,120 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-11-19 08:15:31,319 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-11-19 08:15:31,319 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:15:31,319 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:15:31,319 INFO L85 PathProgramCache]: Analyzing trace with hash 1461347710, now seen corresponding path program 17 times [2022-11-19 08:15:31,319 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:15:31,319 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1655317263] [2022-11-19 08:15:31,320 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:15:31,320 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:15:31,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:15:53,849 INFO L134 CoverageAnalysis]: Checked inductivity of 308 backedges. 40 proven. 268 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:15:53,849 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:15:53,849 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1655317263] [2022-11-19 08:15:53,849 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1655317263] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:15:53,850 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1579032575] [2022-11-19 08:15:53,850 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 08:15:53,850 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:15:53,850 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:15:53,855 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:15:53,859 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-11-19 08:15:54,111 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-11-19 08:15:54,111 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:15:54,119 WARN L261 TraceCheckSpWp]: Trace formula consists of 495 conjuncts, 319 conjunts are in the unsatisfiable core [2022-11-19 08:15:54,126 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:15:54,211 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-19 08:16:00,498 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:16:00,499 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:16:00,500 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:16:00,500 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:16:00,501 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:16:00,504 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:16:00,509 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:16:00,510 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:16:00,511 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:16:00,516 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:16:00,517 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:16:00,519 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 08:16:00,520 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 08:16:00,675 INFO L321 Elim1Store]: treesize reduction 76, result has 65.9 percent of original size [2022-11-19 08:16:00,675 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 16 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 45 case distinctions, treesize of input 153 treesize of output 175 [2022-11-19 08:16:00,994 INFO L134 CoverageAnalysis]: Checked inductivity of 308 backedges. 0 proven. 308 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:16:00,994 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:16:09,249 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 104 treesize of output 92 [2022-11-19 08:16:09,318 INFO L321 Elim1Store]: treesize reduction 108, result has 10.7 percent of original size [2022-11-19 08:16:09,318 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 3130 treesize of output 1862 [2022-11-19 08:23:40,123 INFO L134 CoverageAnalysis]: Checked inductivity of 308 backedges. 0 proven. 287 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-11-19 08:23:40,123 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1579032575] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:23:40,123 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [188778442] [2022-11-19 08:23:40,124 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-11-19 08:23:40,124 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:23:40,124 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:23:40,124 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:23:40,125 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:23:40,140 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:23:40,165 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-19 08:23:40,166 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 08:23:40,175 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:23:40,176 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-19 08:23:40,196 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:23:40,196 INFO L350 Elim1Store]: Elim1 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 26 treesize of output 28 [2022-11-19 08:23:40,236 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:23:40,237 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 08:23:40,259 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-19 08:23:40,260 INFO L350 Elim1Store]: Elim1 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 234 treesize of output 233 [2022-11-19 08:23:40,329 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-19 08:23:40,532 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:23:47,271 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16141#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 08:23:47,271 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:23:47,271 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:23:47,272 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 28, 21] total 97 [2022-11-19 08:23:47,272 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [98878919] [2022-11-19 08:23:47,272 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:23:47,272 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 97 states [2022-11-19 08:23:47,273 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:23:47,273 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 97 interpolants. [2022-11-19 08:23:47,274 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=726, Invalid=9576, Unknown=0, NotChecked=0, Total=10302 [2022-11-19 08:23:47,274 INFO L87 Difference]: Start difference. First operand 174 states and 185 transitions. Second operand has 97 states, 97 states have (on average 2.670103092783505) internal successors, (259), 97 states have internal predecessors, (259), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:23:52,952 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:23:52,952 INFO L93 Difference]: Finished difference Result 251 states and 271 transitions. [2022-11-19 08:23:52,953 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2022-11-19 08:23:52,953 INFO L78 Accepts]: Start accepts. Automaton has has 97 states, 97 states have (on average 2.670103092783505) internal successors, (259), 97 states have internal predecessors, (259), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 92 [2022-11-19 08:23:52,953 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:23:52,954 INFO L225 Difference]: With dead ends: 251 [2022-11-19 08:23:52,954 INFO L226 Difference]: Without dead ends: 167 [2022-11-19 08:23:52,955 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 384 GetRequests, 160 SyntacticMatches, 109 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 11418 ImplicationChecksByTransitivity, 26.2s TimeCoverageRelationStatistics Valid=1089, Invalid=12483, Unknown=0, NotChecked=0, Total=13572 [2022-11-19 08:23:52,956 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 37 mSDsluCounter, 96 mSDsCounter, 0 mSdLazyCounter, 2680 mSolverCounterSat, 441 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 99 SdHoareTripleChecker+Invalid, 5212 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 441 IncrementalHoareTripleChecker+Valid, 2680 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 2091 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2022-11-19 08:23:52,956 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [37 Valid, 99 Invalid, 5212 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [441 Valid, 2680 Invalid, 0 Unknown, 2091 Unchecked, 2.5s Time] [2022-11-19 08:23:52,956 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2022-11-19 08:23:53,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 160. [2022-11-19 08:23:53,032 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 160 states, 159 states have (on average 1.1257861635220126) internal successors, (179), 159 states have internal predecessors, (179), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:23:53,033 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 179 transitions. [2022-11-19 08:23:53,033 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 179 transitions. Word has length 92 [2022-11-19 08:23:53,033 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:23:53,033 INFO L495 AbstractCegarLoop]: Abstraction has 160 states and 179 transitions. [2022-11-19 08:23:53,034 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 97 states, 97 states have (on average 2.670103092783505) internal successors, (259), 97 states have internal predecessors, (259), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:23:53,034 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 179 transitions. [2022-11-19 08:23:53,035 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2022-11-19 08:23:53,035 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:23:53,035 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:23:53,040 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-11-19 08:23:53,236 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:23:53,237 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:23:53,237 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:23:53,237 INFO L85 PathProgramCache]: Analyzing trace with hash 1600867006, now seen corresponding path program 18 times [2022-11-19 08:23:53,237 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:23:53,237 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [907350142] [2022-11-19 08:23:53,237 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:23:53,237 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:23:53,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:23:53,615 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 21 proven. 43 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2022-11-19 08:23:53,616 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:23:53,616 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [907350142] [2022-11-19 08:23:53,616 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [907350142] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:23:53,616 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [886446627] [2022-11-19 08:23:53,616 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 08:23:53,616 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:23:53,616 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:23:53,618 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:23:53,619 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-11-19 08:23:53,748 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 08:23:53,748 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:23:53,750 INFO L263 TraceCheckSpWp]: Trace formula consists of 395 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-19 08:23:53,752 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:23:54,071 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 36 proven. 28 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2022-11-19 08:23:54,071 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:23:54,380 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 36 proven. 28 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2022-11-19 08:23:54,381 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [886446627] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:23:54,381 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1155544714] [2022-11-19 08:23:54,382 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-11-19 08:23:54,382 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:23:54,382 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:23:54,382 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:23:54,382 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:23:54,403 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:23:54,434 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-19 08:23:54,435 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 08:23:54,448 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:23:54,476 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-19 08:23:54,476 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 08:23:54,495 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:23:54,496 INFO L350 Elim1Store]: Elim1 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 31 treesize of output 33 [2022-11-19 08:23:54,537 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:23:54,539 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:23:54,552 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-19 08:23:54,552 INFO L350 Elim1Store]: Elim1 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 244 treesize of output 232 [2022-11-19 08:23:54,598 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-19 08:23:54,796 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:23:56,554 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '17590#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |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___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 08:23:56,554 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:23:56,554 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:23:56,554 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 44 [2022-11-19 08:23:56,555 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [378350373] [2022-11-19 08:23:56,555 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:23:56,555 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2022-11-19 08:23:56,555 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:23:56,555 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2022-11-19 08:23:56,555 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=303, Invalid=2049, Unknown=0, NotChecked=0, Total=2352 [2022-11-19 08:23:56,556 INFO L87 Difference]: Start difference. First operand 160 states and 179 transitions. Second operand has 44 states, 44 states have (on average 1.5681818181818181) internal successors, (69), 44 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:23:57,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:23:57,233 INFO L93 Difference]: Finished difference Result 237 states and 273 transitions. [2022-11-19 08:23:57,233 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-11-19 08:23:57,233 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 1.5681818181818181) internal successors, (69), 44 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 94 [2022-11-19 08:23:57,233 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:23:57,234 INFO L225 Difference]: With dead ends: 237 [2022-11-19 08:23:57,234 INFO L226 Difference]: Without dead ends: 104 [2022-11-19 08:23:57,235 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 310 GetRequests, 212 SyntacticMatches, 41 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2348 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=520, Invalid=2902, Unknown=0, NotChecked=0, Total=3422 [2022-11-19 08:23:57,235 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 519 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 525 mSolverCounterSat, 268 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 519 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 793 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 268 IncrementalHoareTripleChecker+Valid, 525 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-19 08:23:57,236 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [519 Valid, 23 Invalid, 793 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [268 Valid, 525 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-19 08:23:57,236 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2022-11-19 08:23:57,288 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 104. [2022-11-19 08:23:57,288 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 103 states have (on average 1.1067961165048543) internal successors, (114), 103 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:23:57,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 114 transitions. [2022-11-19 08:23:57,289 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 114 transitions. Word has length 94 [2022-11-19 08:23:57,289 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:23:57,289 INFO L495 AbstractCegarLoop]: Abstraction has 104 states and 114 transitions. [2022-11-19 08:23:57,289 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 1.5681818181818181) internal successors, (69), 44 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:23:57,289 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 114 transitions. [2022-11-19 08:23:57,290 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2022-11-19 08:23:57,290 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:23:57,290 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:23:57,295 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-11-19 08:23:57,491 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:23:57,491 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:23:57,491 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:23:57,491 INFO L85 PathProgramCache]: Analyzing trace with hash -650780235, now seen corresponding path program 19 times [2022-11-19 08:23:57,492 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:23:57,492 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1850580017] [2022-11-19 08:23:57,492 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:23:57,492 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:23:58,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:24:24,638 INFO L134 CoverageAnalysis]: Checked inductivity of 396 backedges. 40 proven. 356 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:24:24,638 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:24:24,638 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1850580017] [2022-11-19 08:24:24,638 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1850580017] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:24:24,638 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1804237423] [2022-11-19 08:24:24,639 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 08:24:24,639 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:24:24,639 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:24:24,643 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:24:24,653 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-11-19 08:24:24,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:24:24,844 WARN L261 TraceCheckSpWp]: Trace formula consists of 554 conjuncts, 348 conjunts are in the unsatisfiable core [2022-11-19 08:24:24,851 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:24:25,077 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-19 08:24:31,164 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 08:24:31,166 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-19 08:24:31,166 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 14 [2022-11-19 08:24:31,339 INFO L134 CoverageAnalysis]: Checked inductivity of 396 backedges. 0 proven. 396 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:24:31,340 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:24:35,090 INFO L134 CoverageAnalysis]: Checked inductivity of 396 backedges. 0 proven. 360 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-19 08:24:35,090 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1804237423] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:24:35,090 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1792478455] [2022-11-19 08:24:35,091 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-11-19 08:24:35,091 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:24:35,091 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:24:35,091 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:24:35,091 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:24:35,105 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:24:35,128 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-19 08:24:35,128 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 08:24:35,139 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:24:35,164 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-19 08:24:35,164 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 08:24:35,183 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:24:35,189 INFO L350 Elim1Store]: Elim1 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 26 treesize of output 28 [2022-11-19 08:24:35,248 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:24:35,249 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 08:24:35,275 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-19 08:24:35,276 INFO L350 Elim1Store]: Elim1 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 234 treesize of output 233 [2022-11-19 08:24:35,343 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-19 08:24:35,534 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:24:44,139 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '18995#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |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___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 08:24:44,139 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:24:44,139 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:24:44,140 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [75, 30, 21] total 98 [2022-11-19 08:24:44,140 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1799821645] [2022-11-19 08:24:44,140 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:24:44,141 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 98 states [2022-11-19 08:24:44,141 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:24:44,141 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2022-11-19 08:24:44,142 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=509, Invalid=9997, Unknown=0, NotChecked=0, Total=10506 [2022-11-19 08:24:44,142 INFO L87 Difference]: Start difference. First operand 104 states and 114 transitions. Second operand has 98 states, 98 states have (on average 2.6530612244897958) internal successors, (260), 98 states have internal predecessors, (260), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:25:03,986 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:25:03,986 INFO L93 Difference]: Finished difference Result 229 states and 268 transitions. [2022-11-19 08:25:03,986 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2022-11-19 08:25:03,987 INFO L78 Accepts]: Start accepts. Automaton has has 98 states, 98 states have (on average 2.6530612244897958) internal successors, (260), 98 states have internal predecessors, (260), 0 states have call successors, (0), 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 [2022-11-19 08:25:03,987 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:25:03,988 INFO L225 Difference]: With dead ends: 229 [2022-11-19 08:25:03,988 INFO L226 Difference]: Without dead ends: 226 [2022-11-19 08:25:03,990 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 461 GetRequests, 186 SyntacticMatches, 122 SemanticMatches, 153 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14898 ImplicationChecksByTransitivity, 34.3s TimeCoverageRelationStatistics Valid=1627, Invalid=22243, Unknown=0, NotChecked=0, Total=23870 [2022-11-19 08:25:03,990 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 119 mSDsluCounter, 94 mSDsCounter, 0 mSdLazyCounter, 7534 mSolverCounterSat, 1331 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 119 SdHoareTripleChecker+Valid, 97 SdHoareTripleChecker+Invalid, 8865 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1331 IncrementalHoareTripleChecker+Valid, 7534 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.4s IncrementalHoareTripleChecker+Time [2022-11-19 08:25:03,990 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [119 Valid, 97 Invalid, 8865 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1331 Valid, 7534 Invalid, 0 Unknown, 0 Unchecked, 8.4s Time] [2022-11-19 08:25:03,991 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 226 states. [2022-11-19 08:25:04,063 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 226 to 106. [2022-11-19 08:25:04,064 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 105 states have (on average 1.1142857142857143) internal successors, (117), 105 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:25:04,064 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 117 transitions. [2022-11-19 08:25:04,064 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 117 transitions. Word has length 103 [2022-11-19 08:25:04,064 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:25:04,064 INFO L495 AbstractCegarLoop]: Abstraction has 106 states and 117 transitions. [2022-11-19 08:25:04,064 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 98 states, 98 states have (on average 2.6530612244897958) internal successors, (260), 98 states have internal predecessors, (260), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:25:04,064 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 117 transitions. [2022-11-19 08:25:04,065 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2022-11-19 08:25:04,065 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:25:04,065 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:25:04,071 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-11-19 08:25:04,267 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:25:04,267 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:25:04,267 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:25:04,267 INFO L85 PathProgramCache]: Analyzing trace with hash 1300380217, now seen corresponding path program 20 times [2022-11-19 08:25:04,267 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:25:04,267 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1463946944] [2022-11-19 08:25:04,267 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:25:04,268 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:25:04,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:25:04,624 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 37 proven. 44 refuted. 0 times theorem prover too weak. 324 trivial. 0 not checked. [2022-11-19 08:25:04,624 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:25:04,624 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1463946944] [2022-11-19 08:25:04,625 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1463946944] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:25:04,625 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1660834324] [2022-11-19 08:25:04,625 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 08:25:04,625 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:25:04,625 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:25:04,633 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:25:04,657 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-11-19 08:25:04,917 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-11-19 08:25:04,918 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:25:04,921 INFO L263 TraceCheckSpWp]: Trace formula consists of 559 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-19 08:25:04,922 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:25:05,346 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 45 proven. 36 refuted. 0 times theorem prover too weak. 324 trivial. 0 not checked. [2022-11-19 08:25:05,347 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:25:05,663 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 45 proven. 36 refuted. 0 times theorem prover too weak. 324 trivial. 0 not checked. [2022-11-19 08:25:05,663 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1660834324] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:25:05,664 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1077557487] [2022-11-19 08:25:05,665 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-11-19 08:25:05,665 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:25:05,665 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:25:05,665 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:25:05,665 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:25:05,686 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:25:05,712 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-19 08:25:05,712 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 08:25:05,723 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:25:05,748 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-19 08:25:05,748 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 08:25:05,767 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:25:05,768 INFO L350 Elim1Store]: Elim1 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 26 treesize of output 28 [2022-11-19 08:25:05,810 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:25:05,811 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 08:25:05,834 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-19 08:25:05,835 INFO L350 Elim1Store]: Elim1 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 234 treesize of output 233 [2022-11-19 08:25:05,903 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-19 08:25:06,096 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:25:08,112 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '20416#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |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___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 08:25:08,112 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:25:08,112 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:25:08,112 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 40 [2022-11-19 08:25:08,112 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2031959337] [2022-11-19 08:25:08,112 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:25:08,113 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-11-19 08:25:08,113 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:25:08,113 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-11-19 08:25:08,113 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=318, Invalid=1662, Unknown=0, NotChecked=0, Total=1980 [2022-11-19 08:25:08,114 INFO L87 Difference]: Start difference. First operand 106 states and 117 transitions. Second operand has 40 states, 40 states have (on average 1.725) internal successors, (69), 40 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:25:09,764 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:25:09,765 INFO L93 Difference]: Finished difference Result 376 states and 423 transitions. [2022-11-19 08:25:09,766 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-11-19 08:25:09,766 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.725) internal successors, (69), 40 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 104 [2022-11-19 08:25:09,766 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:25:09,767 INFO L225 Difference]: With dead ends: 376 [2022-11-19 08:25:09,767 INFO L226 Difference]: Without dead ends: 118 [2022-11-19 08:25:09,768 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 366 GetRequests, 232 SyntacticMatches, 73 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3557 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=661, Invalid=3245, Unknown=0, NotChecked=0, Total=3906 [2022-11-19 08:25:09,768 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 121 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 1052 mSolverCounterSat, 907 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 121 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 1959 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 907 IncrementalHoareTripleChecker+Valid, 1052 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-19 08:25:09,769 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [121 Valid, 27 Invalid, 1959 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [907 Valid, 1052 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-11-19 08:25:09,769 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2022-11-19 08:25:09,897 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 114. [2022-11-19 08:25:09,897 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 114 states, 113 states have (on average 1.0973451327433628) internal successors, (124), 113 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:25:09,898 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 124 transitions. [2022-11-19 08:25:09,898 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 124 transitions. Word has length 104 [2022-11-19 08:25:09,898 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:25:09,898 INFO L495 AbstractCegarLoop]: Abstraction has 114 states and 124 transitions. [2022-11-19 08:25:09,898 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 1.725) internal successors, (69), 40 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:25:09,899 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 124 transitions. [2022-11-19 08:25:09,900 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2022-11-19 08:25:09,900 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:25:09,900 INFO L195 NwaCegarLoop]: trace histogram [9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:25:09,907 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-11-19 08:25:10,106 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:25:10,106 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:25:10,107 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:25:10,107 INFO L85 PathProgramCache]: Analyzing trace with hash 615181424, now seen corresponding path program 21 times [2022-11-19 08:25:10,107 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:25:10,107 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1541968531] [2022-11-19 08:25:10,107 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:25:10,107 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:25:10,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:25:10,631 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 28 proven. 53 refuted. 0 times theorem prover too weak. 405 trivial. 0 not checked. [2022-11-19 08:25:10,631 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:25:10,631 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1541968531] [2022-11-19 08:25:10,631 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1541968531] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:25:10,631 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [442819296] [2022-11-19 08:25:10,632 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 08:25:10,632 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:25:10,632 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:25:10,635 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:25:10,666 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-11-19 08:25:10,815 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 08:25:10,815 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:25:10,817 INFO L263 TraceCheckSpWp]: Trace formula consists of 485 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-19 08:25:10,820 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:25:11,250 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 36 proven. 45 refuted. 0 times theorem prover too weak. 405 trivial. 0 not checked. [2022-11-19 08:25:11,250 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:25:11,595 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 36 proven. 45 refuted. 0 times theorem prover too weak. 405 trivial. 0 not checked. [2022-11-19 08:25:11,595 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [442819296] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:25:11,595 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1793271932] [2022-11-19 08:25:11,596 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-11-19 08:25:11,596 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:25:11,597 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:25:11,597 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:25:11,597 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:25:11,613 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:25:11,636 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-19 08:25:11,636 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 08:25:11,647 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:25:11,672 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-19 08:25:11,672 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 08:25:11,693 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:25:11,694 INFO L350 Elim1Store]: Elim1 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 31 treesize of output 33 [2022-11-19 08:25:11,732 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:25:11,740 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:25:11,753 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-19 08:25:11,754 INFO L350 Elim1Store]: Elim1 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 244 treesize of output 232 [2022-11-19 08:25:11,794 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-19 08:25:12,007 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:25:13,677 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '22150#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 08:25:13,677 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:25:13,677 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:25:13,678 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 40 [2022-11-19 08:25:13,678 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [941878284] [2022-11-19 08:25:13,679 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:25:13,679 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-11-19 08:25:13,679 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:25:13,680 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-11-19 08:25:13,680 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=308, Invalid=1672, Unknown=0, NotChecked=0, Total=1980 [2022-11-19 08:25:13,680 INFO L87 Difference]: Start difference. First operand 114 states and 124 transitions. Second operand has 40 states, 40 states have (on average 1.625) internal successors, (65), 40 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:25:14,541 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:25:14,542 INFO L93 Difference]: Finished difference Result 118 states and 128 transitions. [2022-11-19 08:25:14,542 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-11-19 08:25:14,542 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.625) internal successors, (65), 40 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 113 [2022-11-19 08:25:14,542 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:25:14,543 INFO L225 Difference]: With dead ends: 118 [2022-11-19 08:25:14,543 INFO L226 Difference]: Without dead ends: 115 [2022-11-19 08:25:14,543 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 369 GetRequests, 258 SyntacticMatches, 57 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3218 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=585, Invalid=2495, Unknown=0, NotChecked=0, Total=3080 [2022-11-19 08:25:14,544 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 358 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 921 mSolverCounterSat, 385 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 358 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 1306 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 385 IncrementalHoareTripleChecker+Valid, 921 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-19 08:25:14,544 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [358 Valid, 13 Invalid, 1306 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [385 Valid, 921 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-19 08:25:14,544 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2022-11-19 08:25:14,625 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 115. [2022-11-19 08:25:14,625 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 115 states, 114 states have (on average 1.0964912280701755) internal successors, (125), 114 states have internal predecessors, (125), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:25:14,626 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 125 transitions. [2022-11-19 08:25:14,626 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 125 transitions. Word has length 113 [2022-11-19 08:25:14,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:25:14,626 INFO L495 AbstractCegarLoop]: Abstraction has 115 states and 125 transitions. [2022-11-19 08:25:14,626 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 1.625) internal successors, (65), 40 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:25:14,627 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 125 transitions. [2022-11-19 08:25:14,627 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2022-11-19 08:25:14,627 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:25:14,628 INFO L195 NwaCegarLoop]: trace histogram [9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:25:14,635 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2022-11-19 08:25:14,828 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2022-11-19 08:25:14,828 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:25:14,829 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:25:14,829 INFO L85 PathProgramCache]: Analyzing trace with hash 1890485982, now seen corresponding path program 22 times [2022-11-19 08:25:14,829 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:25:14,829 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1210246120] [2022-11-19 08:25:14,829 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:25:14,829 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:25:15,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:25:54,933 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 41 proven. 454 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:25:54,934 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:25:54,934 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1210246120] [2022-11-19 08:25:54,934 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1210246120] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:25:54,934 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1535791650] [2022-11-19 08:25:54,934 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 08:25:54,934 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:25:54,934 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:25:54,935 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:25:54,938 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_79761a14-bb0b-402e-b800-f60f1e2507a4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-11-19 08:25:55,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:25:55,133 WARN L261 TraceCheckSpWp]: Trace formula consists of 613 conjuncts, 390 conjunts are in the unsatisfiable core [2022-11-19 08:25:55,138 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:25:55,503 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9