./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-examples/standard_compareModified_ground.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 38b53e6a 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_534f5968-fdda-4df7-a171-93cfaeba1503/bin/utaipan-ByfvJB40ur/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_534f5968-fdda-4df7-a171-93cfaeba1503/bin/utaipan-ByfvJB40ur/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_534f5968-fdda-4df7-a171-93cfaeba1503/bin/utaipan-ByfvJB40ur/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_534f5968-fdda-4df7-a171-93cfaeba1503/bin/utaipan-ByfvJB40ur/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-examples/standard_compareModified_ground.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_534f5968-fdda-4df7-a171-93cfaeba1503/bin/utaipan-ByfvJB40ur/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_534f5968-fdda-4df7-a171-93cfaeba1503/bin/utaipan-ByfvJB40ur --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 ec4d4b5cea975144b4de3d9f9eb9b04d1c4b7aa6b7464f360f53530c4a9bd50e --- 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-38b53e6 [2022-11-25 22:42:29,569 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-25 22:42:29,579 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-25 22:42:29,601 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-25 22:42:29,602 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-25 22:42:29,603 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-25 22:42:29,604 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-25 22:42:29,606 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-25 22:42:29,608 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-25 22:42:29,614 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-25 22:42:29,615 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-25 22:42:29,616 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-25 22:42:29,616 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-25 22:42:29,617 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-25 22:42:29,618 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-25 22:42:29,619 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-25 22:42:29,620 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-25 22:42:29,621 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-25 22:42:29,626 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-25 22:42:29,633 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-25 22:42:29,638 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-25 22:42:29,642 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-25 22:42:29,645 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-25 22:42:29,645 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-25 22:42:29,653 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-25 22:42:29,656 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-25 22:42:29,657 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-25 22:42:29,658 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-25 22:42:29,659 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-25 22:42:29,660 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-25 22:42:29,662 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-25 22:42:29,663 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-25 22:42:29,664 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-25 22:42:29,666 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-25 22:42:29,667 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-25 22:42:29,668 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-25 22:42:29,669 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-25 22:42:29,669 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-25 22:42:29,669 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-25 22:42:29,671 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-25 22:42:29,672 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-25 22:42:29,673 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_534f5968-fdda-4df7-a171-93cfaeba1503/bin/utaipan-ByfvJB40ur/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-25 22:42:29,706 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-25 22:42:29,706 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-25 22:42:29,707 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-25 22:42:29,707 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-25 22:42:29,708 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-25 22:42:29,708 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-25 22:42:29,708 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-25 22:42:29,709 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-25 22:42:29,709 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-25 22:42:29,709 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-25 22:42:29,710 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-25 22:42:29,723 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-25 22:42:29,723 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-25 22:42:29,723 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-25 22:42:29,723 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-25 22:42:29,724 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-25 22:42:29,724 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-25 22:42:29,724 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-25 22:42:29,725 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-25 22:42:29,725 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-25 22:42:29,725 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-25 22:42:29,725 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-25 22:42:29,725 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-25 22:42:29,726 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-25 22:42:29,726 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-25 22:42:29,726 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-25 22:42:29,726 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-25 22:42:29,726 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-25 22:42:29,726 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-25 22:42:29,727 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-25 22:42:29,727 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-25 22:42:29,728 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-25 22:42:29,728 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-25 22:42:29,728 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-25 22:42:29,729 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-25 22:42:29,729 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-25 22:42:29,729 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-25 22:42:29,729 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-25 22:42:29,729 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-25 22:42:29,730 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-25 22:42:29,730 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-25 22:42:29,730 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_534f5968-fdda-4df7-a171-93cfaeba1503/bin/utaipan-ByfvJB40ur/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_534f5968-fdda-4df7-a171-93cfaeba1503/bin/utaipan-ByfvJB40ur Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> ec4d4b5cea975144b4de3d9f9eb9b04d1c4b7aa6b7464f360f53530c4a9bd50e [2022-11-25 22:42:30,018 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-25 22:42:30,039 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-25 22:42:30,042 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-25 22:42:30,043 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-25 22:42:30,044 INFO L275 PluginConnector]: CDTParser initialized [2022-11-25 22:42:30,045 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_534f5968-fdda-4df7-a171-93cfaeba1503/bin/utaipan-ByfvJB40ur/../../sv-benchmarks/c/array-examples/standard_compareModified_ground.i [2022-11-25 22:42:33,021 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-25 22:42:33,350 INFO L351 CDTParser]: Found 1 translation units. [2022-11-25 22:42:33,350 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_534f5968-fdda-4df7-a171-93cfaeba1503/sv-benchmarks/c/array-examples/standard_compareModified_ground.i [2022-11-25 22:42:33,357 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_534f5968-fdda-4df7-a171-93cfaeba1503/bin/utaipan-ByfvJB40ur/data/30b6c5ebd/c2b5af673bf6474ca67174fdc157c300/FLAG6cae69811 [2022-11-25 22:42:33,382 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_534f5968-fdda-4df7-a171-93cfaeba1503/bin/utaipan-ByfvJB40ur/data/30b6c5ebd/c2b5af673bf6474ca67174fdc157c300 [2022-11-25 22:42:33,387 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-25 22:42:33,390 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-25 22:42:33,394 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-25 22:42:33,394 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-25 22:42:33,398 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-25 22:42:33,399 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 10:42:33" (1/1) ... [2022-11-25 22:42:33,400 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@14f7fb7b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:42:33, skipping insertion in model container [2022-11-25 22:42:33,401 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 10:42:33" (1/1) ... [2022-11-25 22:42:33,409 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-25 22:42:33,433 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-25 22:42:33,613 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_534f5968-fdda-4df7-a171-93cfaeba1503/sv-benchmarks/c/array-examples/standard_compareModified_ground.i[824,837] [2022-11-25 22:42:33,631 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-25 22:42:33,641 INFO L203 MainTranslator]: Completed pre-run [2022-11-25 22:42:33,654 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_534f5968-fdda-4df7-a171-93cfaeba1503/sv-benchmarks/c/array-examples/standard_compareModified_ground.i[824,837] [2022-11-25 22:42:33,662 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-25 22:42:33,675 INFO L208 MainTranslator]: Completed translation [2022-11-25 22:42:33,676 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:42:33 WrapperNode [2022-11-25 22:42:33,676 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-25 22:42:33,677 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-25 22:42:33,678 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-25 22:42:33,678 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-25 22:42:33,685 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:42:33" (1/1) ... [2022-11-25 22:42:33,693 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:42:33" (1/1) ... [2022-11-25 22:42:33,712 INFO L138 Inliner]: procedures = 16, calls = 27, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 86 [2022-11-25 22:42:33,712 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-25 22:42:33,713 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-25 22:42:33,713 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-25 22:42:33,713 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-25 22:42:33,723 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:42:33" (1/1) ... [2022-11-25 22:42:33,724 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:42:33" (1/1) ... [2022-11-25 22:42:33,726 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:42:33" (1/1) ... [2022-11-25 22:42:33,726 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:42:33" (1/1) ... [2022-11-25 22:42:33,732 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:42:33" (1/1) ... [2022-11-25 22:42:33,736 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:42:33" (1/1) ... [2022-11-25 22:42:33,737 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:42:33" (1/1) ... [2022-11-25 22:42:33,738 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:42:33" (1/1) ... [2022-11-25 22:42:33,747 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-25 22:42:33,747 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-25 22:42:33,748 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-25 22:42:33,757 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-25 22:42:33,758 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:42:33" (1/1) ... [2022-11-25 22:42:33,764 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-25 22:42:33,779 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_534f5968-fdda-4df7-a171-93cfaeba1503/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 22:42:33,794 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_534f5968-fdda-4df7-a171-93cfaeba1503/bin/utaipan-ByfvJB40ur/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-25 22:42:33,821 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_534f5968-fdda-4df7-a171-93cfaeba1503/bin/utaipan-ByfvJB40ur/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-25 22:42:33,842 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-25 22:42:33,843 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-25 22:42:33,843 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-11-25 22:42:33,843 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-11-25 22:42:33,843 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-25 22:42:33,844 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-25 22:42:33,844 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-11-25 22:42:33,844 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-11-25 22:42:33,844 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-11-25 22:42:33,845 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-11-25 22:42:33,928 INFO L235 CfgBuilder]: Building ICFG [2022-11-25 22:42:33,930 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-25 22:42:34,193 INFO L276 CfgBuilder]: Performing block encoding [2022-11-25 22:42:34,267 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-25 22:42:34,277 INFO L300 CfgBuilder]: Removed 4 assume(true) statements. [2022-11-25 22:42:34,281 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 10:42:34 BoogieIcfgContainer [2022-11-25 22:42:34,282 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-25 22:42:34,284 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-25 22:42:34,284 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-25 22:42:34,288 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-25 22:42:34,288 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 10:42:33" (1/3) ... [2022-11-25 22:42:34,289 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@62742f08 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 10:42:34, skipping insertion in model container [2022-11-25 22:42:34,290 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:42:33" (2/3) ... [2022-11-25 22:42:34,292 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@62742f08 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 10:42:34, skipping insertion in model container [2022-11-25 22:42:34,292 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 10:42:34" (3/3) ... [2022-11-25 22:42:34,298 INFO L112 eAbstractionObserver]: Analyzing ICFG standard_compareModified_ground.i [2022-11-25 22:42:34,319 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-25 22:42:34,319 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-25 22:42:34,366 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-25 22:42:34,373 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;@58041a5b, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-25 22:42:34,373 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-25 22:42:34,377 INFO L276 IsEmpty]: Start isEmpty. Operand has 18 states, 13 states have (on average 1.5384615384615385) internal successors, (20), 14 states have internal predecessors, (20), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-25 22:42:34,384 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-25 22:42:34,385 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 22:42:34,385 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 22:42:34,386 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 22:42:34,391 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 22:42:34,391 INFO L85 PathProgramCache]: Analyzing trace with hash 1259005784, now seen corresponding path program 1 times [2022-11-25 22:42:34,401 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 22:42:34,402 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1587162558] [2022-11-25 22:42:34,402 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:42:34,402 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 22:42:34,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:42:34,676 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 22:42:34,677 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 22:42:34,677 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1587162558] [2022-11-25 22:42:34,678 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1587162558] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 22:42:34,679 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 22:42:34,679 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-25 22:42:34,681 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1743725699] [2022-11-25 22:42:34,681 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 22:42:34,686 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-25 22:42:34,687 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 22:42:34,717 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-25 22:42:34,718 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-25 22:42:34,720 INFO L87 Difference]: Start difference. First operand has 18 states, 13 states have (on average 1.5384615384615385) internal successors, (20), 14 states have internal predecessors, (20), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:42:34,780 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 22:42:34,780 INFO L93 Difference]: Finished difference Result 35 states and 49 transitions. [2022-11-25 22:42:34,782 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-25 22:42:34,783 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2022-11-25 22:42:34,783 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 22:42:34,792 INFO L225 Difference]: With dead ends: 35 [2022-11-25 22:42:34,792 INFO L226 Difference]: Without dead ends: 18 [2022-11-25 22:42:34,796 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-25 22:42:34,802 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 17 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-25 22:42:34,804 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 28 Invalid, 17 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-25 22:42:34,823 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2022-11-25 22:42:34,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2022-11-25 22:42:34,844 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 14 states have internal predecessors, (19), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-25 22:42:34,846 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 23 transitions. [2022-11-25 22:42:34,848 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 23 transitions. Word has length 9 [2022-11-25 22:42:34,849 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 22:42:34,849 INFO L495 AbstractCegarLoop]: Abstraction has 18 states and 23 transitions. [2022-11-25 22:42:34,850 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:42:34,850 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 23 transitions. [2022-11-25 22:42:34,852 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-11-25 22:42:34,853 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 22:42:34,854 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 22:42:34,854 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-25 22:42:34,854 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 22:42:34,855 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 22:42:34,855 INFO L85 PathProgramCache]: Analyzing trace with hash 1981076570, now seen corresponding path program 1 times [2022-11-25 22:42:34,856 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 22:42:34,856 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1853951227] [2022-11-25 22:42:34,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:42:34,857 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 22:42:34,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:42:35,009 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 22:42:35,009 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 22:42:35,009 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1853951227] [2022-11-25 22:42:35,010 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1853951227] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 22:42:35,010 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [843021498] [2022-11-25 22:42:35,010 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:42:35,010 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:42:35,011 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_534f5968-fdda-4df7-a171-93cfaeba1503/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 22:42:35,014 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_534f5968-fdda-4df7-a171-93cfaeba1503/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 22:42:35,039 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_534f5968-fdda-4df7-a171-93cfaeba1503/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-25 22:42:35,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:42:35,135 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-25 22:42:35,140 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 22:42:35,174 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-25 22:42:35,174 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-25 22:42:35,179 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [843021498] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 22:42:35,179 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-25 22:42:35,180 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [3] total 4 [2022-11-25 22:42:35,181 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [587531287] [2022-11-25 22:42:35,182 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 22:42:35,184 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-25 22:42:35,187 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 22:42:35,188 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-25 22:42:35,189 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-25 22:42:35,189 INFO L87 Difference]: Start difference. First operand 18 states and 23 transitions. Second operand has 3 states, 3 states have (on average 3.0) internal successors, (9), 2 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:42:35,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 22:42:35,234 INFO L93 Difference]: Finished difference Result 33 states and 42 transitions. [2022-11-25 22:42:35,234 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-25 22:42:35,234 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 2 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2022-11-25 22:42:35,235 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 22:42:35,235 INFO L225 Difference]: With dead ends: 33 [2022-11-25 22:42:35,235 INFO L226 Difference]: Without dead ends: 19 [2022-11-25 22:42:35,236 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-25 22:42:35,251 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-25 22:42:35,252 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 28 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-25 22:42:35,253 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2022-11-25 22:42:35,256 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2022-11-25 22:42:35,256 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 15 states have (on average 1.3333333333333333) internal successors, (20), 15 states have internal predecessors, (20), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-25 22:42:35,257 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 24 transitions. [2022-11-25 22:42:35,258 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 24 transitions. Word has length 10 [2022-11-25 22:42:35,258 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 22:42:35,258 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 24 transitions. [2022-11-25 22:42:35,258 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 2 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:42:35,259 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 24 transitions. [2022-11-25 22:42:35,259 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-11-25 22:42:35,259 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 22:42:35,260 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 22:42:35,271 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_534f5968-fdda-4df7-a171-93cfaeba1503/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-25 22:42:35,460 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_534f5968-fdda-4df7-a171-93cfaeba1503/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:42:35,461 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 22:42:35,462 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 22:42:35,462 INFO L85 PathProgramCache]: Analyzing trace with hash 252948675, now seen corresponding path program 1 times [2022-11-25 22:42:35,462 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 22:42:35,462 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [67330737] [2022-11-25 22:42:35,463 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:42:35,463 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 22:42:35,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:42:35,654 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-25 22:42:35,655 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 22:42:35,655 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [67330737] [2022-11-25 22:42:35,656 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [67330737] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 22:42:35,658 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [297574879] [2022-11-25 22:42:35,658 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:42:35,659 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:42:35,659 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_534f5968-fdda-4df7-a171-93cfaeba1503/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 22:42:35,663 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_534f5968-fdda-4df7-a171-93cfaeba1503/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 22:42:35,696 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_534f5968-fdda-4df7-a171-93cfaeba1503/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-25 22:42:35,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:42:35,775 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-25 22:42:35,776 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 22:42:35,813 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-25 22:42:35,813 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 22:42:35,851 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-25 22:42:35,851 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [297574879] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 22:42:35,852 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [349744431] [2022-11-25 22:42:35,878 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-25 22:42:35,879 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 22:42:35,882 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 22:42:35,888 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 22:42:35,888 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 22:42:36,008 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:36,013 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:36,016 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:36,121 INFO L321 Elim1Store]: treesize reduction 129, result has 17.8 percent of original size [2022-11-25 22:42:36,125 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 9 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 55 treesize of output 73 [2022-11-25 22:42:36,151 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:36,153 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:36,154 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:36,157 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 13 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 32 [2022-11-25 22:42:36,252 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:36,255 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:36,259 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 10 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 35 [2022-11-25 22:42:36,468 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:36,470 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:36,474 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:42:36,476 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:42:36,476 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:42:36,566 INFO L321 Elim1Store]: treesize reduction 235, result has 16.4 percent of original size [2022-11-25 22:42:36,567 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 360 treesize of output 350 [2022-11-25 22:42:37,128 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:42:37,141 INFO L321 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2022-11-25 22:42:37,142 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 1 case distinctions, treesize of input 42 treesize of output 29 [2022-11-25 22:42:37,205 INFO L321 Elim1Store]: treesize reduction 28, result has 49.1 percent of original size [2022-11-25 22:42:37,205 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 48 treesize of output 50 [2022-11-25 22:42:37,269 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:42:37,270 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:42:37,308 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-11-25 22:42:37,308 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 78 treesize of output 65 [2022-11-25 22:42:37,448 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:42:37,449 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:42:37,484 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-11-25 22:42:37,485 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 78 treesize of output 65 [2022-11-25 22:42:37,531 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2022-11-25 22:42:37,553 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 22:42:37,881 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '273#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (exists ((|v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_1| Int) (|v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_1| Int)) (and (= |__VERIFIER_assert_#in~cond| (ite (= (select (select |#memory_int| |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_1|) 0) (select (select |#memory_int| |v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_1|) 0)) 1 0)) (<= 0 |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_1|) (<= 0 |v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_1|))) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 22:42:37,881 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 22:42:37,881 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 22:42:37,881 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2022-11-25 22:42:37,881 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1738616511] [2022-11-25 22:42:37,881 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 22:42:37,882 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-25 22:42:37,882 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 22:42:37,883 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-25 22:42:37,883 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=164, Unknown=0, NotChecked=0, Total=210 [2022-11-25 22:42:37,883 INFO L87 Difference]: Start difference. First operand 19 states and 24 transitions. Second operand has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 states have internal predecessors, (15), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:42:37,932 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 22:42:37,932 INFO L93 Difference]: Finished difference Result 38 states and 50 transitions. [2022-11-25 22:42:37,932 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-25 22:42:37,933 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 states have internal predecessors, (15), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2022-11-25 22:42:37,933 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 22:42:37,933 INFO L225 Difference]: With dead ends: 38 [2022-11-25 22:42:37,933 INFO L226 Difference]: Without dead ends: 22 [2022-11-25 22:42:37,934 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=46, Invalid=164, Unknown=0, NotChecked=0, Total=210 [2022-11-25 22:42:37,935 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 26 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-25 22:42:37,935 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 42 Invalid, 26 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-25 22:42:37,936 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2022-11-25 22:42:37,940 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2022-11-25 22:42:37,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 18 states have (on average 1.2777777777777777) internal successors, (23), 18 states have internal predecessors, (23), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-25 22:42:37,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 27 transitions. [2022-11-25 22:42:37,941 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 27 transitions. Word has length 11 [2022-11-25 22:42:37,941 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 22:42:37,941 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 27 transitions. [2022-11-25 22:42:37,942 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 states have internal predecessors, (15), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:42:37,942 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 27 transitions. [2022-11-25 22:42:37,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-11-25 22:42:37,943 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 22:42:37,943 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 22:42:37,956 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_534f5968-fdda-4df7-a171-93cfaeba1503/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-25 22:42:38,149 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_534f5968-fdda-4df7-a171-93cfaeba1503/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:42:38,149 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 22:42:38,149 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 22:42:38,150 INFO L85 PathProgramCache]: Analyzing trace with hash -1580081915, now seen corresponding path program 2 times [2022-11-25 22:42:38,150 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 22:42:38,150 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [298525977] [2022-11-25 22:42:38,150 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:42:38,150 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 22:42:38,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:42:38,248 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-25 22:42:38,248 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 22:42:38,249 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [298525977] [2022-11-25 22:42:38,249 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [298525977] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 22:42:38,249 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [337901929] [2022-11-25 22:42:38,249 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 22:42:38,253 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:42:38,254 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_534f5968-fdda-4df7-a171-93cfaeba1503/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 22:42:38,255 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_534f5968-fdda-4df7-a171-93cfaeba1503/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 22:42:38,282 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_534f5968-fdda-4df7-a171-93cfaeba1503/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-25 22:42:38,353 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-25 22:42:38,353 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 22:42:38,355 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-25 22:42:38,356 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 22:42:38,394 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-25 22:42:38,394 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 22:42:38,429 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-25 22:42:38,430 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [337901929] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 22:42:38,430 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1871614143] [2022-11-25 22:42:38,432 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-25 22:42:38,432 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 22:42:38,432 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 22:42:38,433 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 22:42:38,441 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 22:42:38,481 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:38,484 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:38,486 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:38,567 INFO L321 Elim1Store]: treesize reduction 129, result has 17.8 percent of original size [2022-11-25 22:42:38,567 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 9 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 55 treesize of output 73 [2022-11-25 22:42:38,589 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:38,590 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:38,592 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:38,593 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 13 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 32 [2022-11-25 22:42:38,636 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:38,638 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:38,642 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 10 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 35 [2022-11-25 22:42:38,792 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:38,793 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:38,799 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:42:38,800 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:42:38,801 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:42:38,885 INFO L321 Elim1Store]: treesize reduction 235, result has 16.4 percent of original size [2022-11-25 22:42:38,886 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 360 treesize of output 350 [2022-11-25 22:42:39,369 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:42:39,383 INFO L321 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2022-11-25 22:42:39,383 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 1 case distinctions, treesize of input 42 treesize of output 29 [2022-11-25 22:42:39,442 INFO L321 Elim1Store]: treesize reduction 28, result has 49.1 percent of original size [2022-11-25 22:42:39,443 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 48 treesize of output 50 [2022-11-25 22:42:39,498 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:42:39,499 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:42:39,534 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-11-25 22:42:39,535 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 78 treesize of output 65 [2022-11-25 22:42:39,592 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2022-11-25 22:42:39,615 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 22:42:39,935 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '457#(and (exists ((|v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_2| Int) (|v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_2| Int)) (and (<= 0 |v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_2|) (<= 0 |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_2|) (= (ite (= (select (select |#memory_int| |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_2|) 0) (select (select |#memory_int| |v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_2|) 0)) 1 0) |__VERIFIER_assert_#in~cond|))) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 22:42:39,935 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 22:42:39,935 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 22:42:39,935 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2022-11-25 22:42:39,935 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [707822403] [2022-11-25 22:42:39,935 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 22:42:39,936 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-25 22:42:39,936 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 22:42:39,936 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-25 22:42:39,937 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=159, Unknown=0, NotChecked=0, Total=210 [2022-11-25 22:42:39,937 INFO L87 Difference]: Start difference. First operand 22 states and 27 transitions. Second operand has 7 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 6 states have internal predecessors, (19), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:42:39,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 22:42:39,969 INFO L93 Difference]: Finished difference Result 39 states and 50 transitions. [2022-11-25 22:42:39,969 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-25 22:42:39,969 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 6 states have internal predecessors, (19), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2022-11-25 22:42:39,970 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 22:42:39,970 INFO L225 Difference]: With dead ends: 39 [2022-11-25 22:42:39,970 INFO L226 Difference]: Without dead ends: 25 [2022-11-25 22:42:39,971 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=51, Invalid=159, Unknown=0, NotChecked=0, Total=210 [2022-11-25 22:42:39,972 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 18 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-25 22:42:39,972 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 28 Invalid, 18 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-25 22:42:39,973 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2022-11-25 22:42:39,976 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2022-11-25 22:42:39,976 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 21 states have (on average 1.2380952380952381) internal successors, (26), 21 states have internal predecessors, (26), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-25 22:42:39,977 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 30 transitions. [2022-11-25 22:42:39,977 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 30 transitions. Word has length 14 [2022-11-25 22:42:39,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 22:42:39,978 INFO L495 AbstractCegarLoop]: Abstraction has 25 states and 30 transitions. [2022-11-25 22:42:39,978 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 6 states have internal predecessors, (19), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:42:39,978 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 30 transitions. [2022-11-25 22:42:39,979 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-11-25 22:42:39,979 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 22:42:39,979 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 22:42:39,991 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_534f5968-fdda-4df7-a171-93cfaeba1503/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-25 22:42:40,185 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_534f5968-fdda-4df7-a171-93cfaeba1503/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:42:40,186 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 22:42:40,186 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 22:42:40,186 INFO L85 PathProgramCache]: Analyzing trace with hash -843220200, now seen corresponding path program 3 times [2022-11-25 22:42:40,186 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 22:42:40,187 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [452462880] [2022-11-25 22:42:40,187 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:42:40,187 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 22:42:40,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:42:40,410 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-25 22:42:40,410 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 22:42:40,410 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [452462880] [2022-11-25 22:42:40,410 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [452462880] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 22:42:40,411 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1035949948] [2022-11-25 22:42:40,411 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 22:42:40,411 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:42:40,411 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_534f5968-fdda-4df7-a171-93cfaeba1503/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 22:42:40,415 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_534f5968-fdda-4df7-a171-93cfaeba1503/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 22:42:40,442 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_534f5968-fdda-4df7-a171-93cfaeba1503/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-25 22:42:40,516 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 22:42:40,516 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 22:42:40,518 INFO L263 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 6 conjunts are in the unsatisfiable core [2022-11-25 22:42:40,522 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 22:42:40,545 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-25 22:42:40,545 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 22:42:40,601 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-25 22:42:40,601 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1035949948] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 22:42:40,601 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1079930054] [2022-11-25 22:42:40,604 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-25 22:42:40,604 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 22:42:40,604 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 22:42:40,605 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 22:42:40,605 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 22:42:40,628 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:40,631 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:40,634 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:40,699 INFO L321 Elim1Store]: treesize reduction 129, result has 17.8 percent of original size [2022-11-25 22:42:40,700 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 9 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 55 treesize of output 73 [2022-11-25 22:42:40,715 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:40,716 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:40,718 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:40,722 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 13 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 32 [2022-11-25 22:42:40,757 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:40,758 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:40,760 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 10 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 57 treesize of output 45 [2022-11-25 22:42:40,882 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:40,885 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:40,886 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:40,887 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:40,888 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:42:40,891 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:40,892 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:42:40,926 INFO L321 Elim1Store]: treesize reduction 135, result has 12.9 percent of original size [2022-11-25 22:42:40,926 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 380 treesize of output 348 [2022-11-25 22:42:41,011 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:42:41,026 INFO L321 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2022-11-25 22:42:41,027 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 1 case distinctions, treesize of input 42 treesize of output 29 [2022-11-25 22:42:41,080 INFO L321 Elim1Store]: treesize reduction 28, result has 49.1 percent of original size [2022-11-25 22:42:41,081 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 48 treesize of output 50 [2022-11-25 22:42:41,128 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:42:41,129 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:42:41,158 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-11-25 22:42:41,159 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 78 treesize of output 65 [2022-11-25 22:42:41,200 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2022-11-25 22:42:41,219 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 22:42:41,534 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '673#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (exists ((|v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_3| Int) (|v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_3| Int)) (and (= |__VERIFIER_assert_#in~cond| (ite (= (select (select |#memory_int| |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_3|) 0) (select (select |#memory_int| |v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_3|) 0)) 1 0)) (<= 0 |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_3|) (<= 0 |v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_3|))) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 22:42:41,534 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 22:42:41,534 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 22:42:41,534 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2022-11-25 22:42:41,534 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1091279157] [2022-11-25 22:42:41,535 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 22:42:41,535 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-11-25 22:42:41,535 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 22:42:41,535 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-11-25 22:42:41,536 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=317, Unknown=0, NotChecked=0, Total=420 [2022-11-25 22:42:41,536 INFO L87 Difference]: Start difference. First operand 25 states and 30 transitions. Second operand has 13 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 12 states have internal predecessors, (21), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:42:41,614 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 22:42:41,614 INFO L93 Difference]: Finished difference Result 50 states and 65 transitions. [2022-11-25 22:42:41,614 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-25 22:42:41,615 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 12 states have internal predecessors, (21), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2022-11-25 22:42:41,615 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 22:42:41,616 INFO L225 Difference]: With dead ends: 50 [2022-11-25 22:42:41,618 INFO L226 Difference]: Without dead ends: 31 [2022-11-25 22:42:41,618 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=103, Invalid=317, Unknown=0, NotChecked=0, Total=420 [2022-11-25 22:42:41,619 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 22:42:41,620 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 70 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 22:42:41,622 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2022-11-25 22:42:41,629 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2022-11-25 22:42:41,629 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 27 states have (on average 1.1851851851851851) internal successors, (32), 27 states have internal predecessors, (32), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-25 22:42:41,632 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 36 transitions. [2022-11-25 22:42:41,632 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 36 transitions. Word has length 17 [2022-11-25 22:42:41,632 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 22:42:41,632 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 36 transitions. [2022-11-25 22:42:41,633 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 12 states have internal predecessors, (21), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:42:41,633 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 36 transitions. [2022-11-25 22:42:41,634 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-11-25 22:42:41,635 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 22:42:41,635 INFO L195 NwaCegarLoop]: trace histogram [10, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 22:42:41,644 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_534f5968-fdda-4df7-a171-93cfaeba1503/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-25 22:42:41,841 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_534f5968-fdda-4df7-a171-93cfaeba1503/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:42:41,841 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 22:42:41,842 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 22:42:41,842 INFO L85 PathProgramCache]: Analyzing trace with hash 1290300376, now seen corresponding path program 4 times [2022-11-25 22:42:41,842 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 22:42:41,842 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1461084943] [2022-11-25 22:42:41,842 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:42:41,842 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 22:42:41,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:42:42,227 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-25 22:42:42,227 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 22:42:42,228 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1461084943] [2022-11-25 22:42:42,228 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1461084943] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 22:42:42,228 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [960396428] [2022-11-25 22:42:42,228 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 22:42:42,228 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:42:42,229 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_534f5968-fdda-4df7-a171-93cfaeba1503/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 22:42:42,230 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_534f5968-fdda-4df7-a171-93cfaeba1503/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 22:42:42,255 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_534f5968-fdda-4df7-a171-93cfaeba1503/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-25 22:42:42,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:42:42,357 INFO L263 TraceCheckSpWp]: Trace formula consists of 286 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-25 22:42:42,359 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 22:42:42,388 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-25 22:42:42,389 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 22:42:42,601 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-25 22:42:42,602 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [960396428] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 22:42:42,602 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1921850361] [2022-11-25 22:42:42,605 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-25 22:42:42,606 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 22:42:42,606 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 22:42:42,606 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 22:42:42,606 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 22:42:42,625 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:42,626 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:42,627 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:42,694 INFO L321 Elim1Store]: treesize reduction 83, result has 23.9 percent of original size [2022-11-25 22:42:42,695 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 7 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 23 treesize of output 42 [2022-11-25 22:42:42,716 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:42,719 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:42,721 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:42,792 INFO L321 Elim1Store]: treesize reduction 129, result has 17.8 percent of original size [2022-11-25 22:42:42,793 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 9 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 55 treesize of output 73 [2022-11-25 22:42:42,835 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:42,836 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:42,839 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 10 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 35 [2022-11-25 22:42:42,940 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:42,942 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:42,945 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:42:42,946 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:42:42,946 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:42:43,012 INFO L321 Elim1Store]: treesize reduction 235, result has 16.4 percent of original size [2022-11-25 22:42:43,012 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 360 treesize of output 350 [2022-11-25 22:42:43,437 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:42:43,454 INFO L321 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2022-11-25 22:42:43,455 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 1 case distinctions, treesize of input 42 treesize of output 29 [2022-11-25 22:42:43,527 INFO L321 Elim1Store]: treesize reduction 28, result has 49.1 percent of original size [2022-11-25 22:42:43,528 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 48 treesize of output 50 [2022-11-25 22:42:43,589 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:42:43,590 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:42:43,621 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-11-25 22:42:43,621 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 78 treesize of output 65 [2022-11-25 22:42:43,667 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2022-11-25 22:42:43,681 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 22:42:44,040 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '971#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (exists ((|v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_4| Int) (|v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_4| Int)) (and (<= 0 |v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_4|) (= |__VERIFIER_assert_#in~cond| (ite (= (select (select |#memory_int| |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_4|) 0) (select (select |#memory_int| |v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_4|) 0)) 1 0)) (<= 0 |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_4|))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 22:42:44,040 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 22:42:44,040 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 22:42:44,041 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 24 [2022-11-25 22:42:44,041 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [974116545] [2022-11-25 22:42:44,041 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 22:42:44,041 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-11-25 22:42:44,041 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 22:42:44,042 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-11-25 22:42:44,043 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=325, Invalid=731, Unknown=0, NotChecked=0, Total=1056 [2022-11-25 22:42:44,043 INFO L87 Difference]: Start difference. First operand 31 states and 36 transitions. Second operand has 25 states, 25 states have (on average 1.32) internal successors, (33), 24 states have internal predecessors, (33), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:42:44,115 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 22:42:44,115 INFO L93 Difference]: Finished difference Result 62 states and 83 transitions. [2022-11-25 22:42:44,116 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-11-25 22:42:44,117 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.32) internal successors, (33), 24 states have internal predecessors, (33), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2022-11-25 22:42:44,118 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 22:42:44,119 INFO L225 Difference]: With dead ends: 62 [2022-11-25 22:42:44,119 INFO L226 Difference]: Without dead ends: 43 [2022-11-25 22:42:44,120 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 310 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=325, Invalid=731, Unknown=0, NotChecked=0, Total=1056 [2022-11-25 22:42:44,121 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 49 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 22:42:44,121 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 56 Invalid, 49 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 22:42:44,122 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2022-11-25 22:42:44,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2022-11-25 22:42:44,126 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 39 states have (on average 1.1282051282051282) internal successors, (44), 39 states have internal predecessors, (44), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-25 22:42:44,130 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 48 transitions. [2022-11-25 22:42:44,131 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 48 transitions. Word has length 23 [2022-11-25 22:42:44,131 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 22:42:44,131 INFO L495 AbstractCegarLoop]: Abstraction has 43 states and 48 transitions. [2022-11-25 22:42:44,131 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.32) internal successors, (33), 24 states have internal predecessors, (33), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:42:44,132 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 48 transitions. [2022-11-25 22:42:44,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-11-25 22:42:44,133 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 22:42:44,133 INFO L195 NwaCegarLoop]: trace histogram [22, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 22:42:44,148 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_534f5968-fdda-4df7-a171-93cfaeba1503/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-25 22:42:44,343 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_534f5968-fdda-4df7-a171-93cfaeba1503/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2022-11-25 22:42:44,343 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 22:42:44,343 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 22:42:44,343 INFO L85 PathProgramCache]: Analyzing trace with hash -1856791208, now seen corresponding path program 5 times [2022-11-25 22:42:44,343 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 22:42:44,344 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [208963328] [2022-11-25 22:42:44,344 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:42:44,344 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 22:42:44,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:42:45,134 INFO L134 CoverageAnalysis]: Checked inductivity of 263 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-25 22:42:45,134 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 22:42:45,134 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [208963328] [2022-11-25 22:42:45,134 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [208963328] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 22:42:45,134 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1739040014] [2022-11-25 22:42:45,135 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 22:42:45,135 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:42:45,135 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_534f5968-fdda-4df7-a171-93cfaeba1503/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 22:42:45,136 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_534f5968-fdda-4df7-a171-93cfaeba1503/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 22:42:45,166 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_534f5968-fdda-4df7-a171-93cfaeba1503/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-25 22:42:45,302 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-25 22:42:45,303 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 22:42:45,304 INFO L263 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 6 conjunts are in the unsatisfiable core [2022-11-25 22:42:45,306 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 22:42:45,425 INFO L134 CoverageAnalysis]: Checked inductivity of 263 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2022-11-25 22:42:45,425 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 22:42:45,564 INFO L134 CoverageAnalysis]: Checked inductivity of 263 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2022-11-25 22:42:45,564 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1739040014] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 22:42:45,565 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [734977450] [2022-11-25 22:42:45,566 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-25 22:42:45,567 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 22:42:45,567 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 22:42:45,567 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 22:42:45,567 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 22:42:45,586 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:45,589 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:45,591 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:45,657 INFO L321 Elim1Store]: treesize reduction 129, result has 17.8 percent of original size [2022-11-25 22:42:45,657 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 9 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 55 treesize of output 73 [2022-11-25 22:42:45,674 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:45,676 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:45,677 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:45,678 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 13 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 32 [2022-11-25 22:42:45,707 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:45,708 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:45,712 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 10 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 57 treesize of output 45 [2022-11-25 22:42:45,817 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:45,818 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:45,819 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:45,821 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:45,822 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:42:45,825 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:45,826 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:42:45,870 INFO L321 Elim1Store]: treesize reduction 135, result has 12.9 percent of original size [2022-11-25 22:42:45,871 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 380 treesize of output 348 [2022-11-25 22:42:45,979 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:42:45,991 INFO L321 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2022-11-25 22:42:45,991 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 1 case distinctions, treesize of input 42 treesize of output 29 [2022-11-25 22:42:46,014 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:42:46,015 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:42:46,046 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-11-25 22:42:46,046 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 78 treesize of output 65 [2022-11-25 22:42:46,088 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:42:46,089 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:42:46,121 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-11-25 22:42:46,122 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 78 treesize of output 65 [2022-11-25 22:42:46,163 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2022-11-25 22:42:46,177 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 22:42:46,708 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1399#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (exists ((|v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_5| Int) (|v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_5| Int)) (and (<= 0 |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_5|) (<= 0 |v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_5|) (= |__VERIFIER_assert_#in~cond| (ite (= (select (select |#memory_int| |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_5|) 0) (select (select |#memory_int| |v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_5|) 0)) 1 0)))) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 22:42:46,708 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 22:42:46,708 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 22:42:46,708 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 6, 6] total 34 [2022-11-25 22:42:46,708 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [841544562] [2022-11-25 22:42:46,708 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 22:42:46,709 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-11-25 22:42:46,709 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 22:42:46,709 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-11-25 22:42:46,710 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=400, Invalid=1406, Unknown=0, NotChecked=0, Total=1806 [2022-11-25 22:42:46,710 INFO L87 Difference]: Start difference. First operand 43 states and 48 transitions. Second operand has 35 states, 35 states have (on average 1.3428571428571427) internal successors, (47), 34 states have internal predecessors, (47), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:42:47,288 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 22:42:47,288 INFO L93 Difference]: Finished difference Result 69 states and 85 transitions. [2022-11-25 22:42:47,288 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-11-25 22:42:47,289 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.3428571428571427) internal successors, (47), 34 states have internal predecessors, (47), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 35 [2022-11-25 22:42:47,290 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 22:42:47,291 INFO L225 Difference]: With dead ends: 69 [2022-11-25 22:42:47,291 INFO L226 Difference]: Without dead ends: 50 [2022-11-25 22:42:47,293 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 86 SyntacticMatches, 0 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 862 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1205, Invalid=3085, Unknown=0, NotChecked=0, Total=4290 [2022-11-25 22:42:47,294 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 112 mSDsCounter, 0 mSdLazyCounter, 83 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 126 SdHoareTripleChecker+Invalid, 84 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 83 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 22:42:47,295 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 126 Invalid, 84 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 83 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 22:42:47,296 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2022-11-25 22:42:47,307 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2022-11-25 22:42:47,310 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 46 states have (on average 1.108695652173913) internal successors, (51), 46 states have internal predecessors, (51), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-25 22:42:47,313 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 55 transitions. [2022-11-25 22:42:47,313 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 55 transitions. Word has length 35 [2022-11-25 22:42:47,313 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 22:42:47,313 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 55 transitions. [2022-11-25 22:42:47,314 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.3428571428571427) internal successors, (47), 34 states have internal predecessors, (47), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:42:47,314 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 55 transitions. [2022-11-25 22:42:47,316 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2022-11-25 22:42:47,318 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 22:42:47,318 INFO L195 NwaCegarLoop]: trace histogram [23, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 22:42:47,331 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_534f5968-fdda-4df7-a171-93cfaeba1503/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2022-11-25 22:42:47,524 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_534f5968-fdda-4df7-a171-93cfaeba1503/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:42:47,524 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 22:42:47,524 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 22:42:47,524 INFO L85 PathProgramCache]: Analyzing trace with hash -1217782982, now seen corresponding path program 6 times [2022-11-25 22:42:47,524 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 22:42:47,524 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [613704465] [2022-11-25 22:42:47,525 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:42:47,525 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 22:42:47,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:42:48,438 INFO L134 CoverageAnalysis]: Checked inductivity of 331 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-11-25 22:42:48,439 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 22:42:48,439 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [613704465] [2022-11-25 22:42:48,439 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [613704465] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 22:42:48,439 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [834772762] [2022-11-25 22:42:48,439 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 22:42:48,439 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:42:48,439 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_534f5968-fdda-4df7-a171-93cfaeba1503/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 22:42:48,440 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_534f5968-fdda-4df7-a171-93cfaeba1503/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 22:42:48,446 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_534f5968-fdda-4df7-a171-93cfaeba1503/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-25 22:42:48,662 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 22:42:48,662 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 22:42:48,665 INFO L263 TraceCheckSpWp]: Trace formula consists of 555 conjuncts, 25 conjunts are in the unsatisfiable core [2022-11-25 22:42:48,667 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 22:42:48,737 INFO L134 CoverageAnalysis]: Checked inductivity of 331 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-11-25 22:42:48,737 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 22:42:49,694 INFO L134 CoverageAnalysis]: Checked inductivity of 331 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-11-25 22:42:49,694 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [834772762] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 22:42:49,695 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1568959578] [2022-11-25 22:42:49,696 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-25 22:42:49,696 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 22:42:49,697 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 22:42:49,697 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 22:42:49,697 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 22:42:49,723 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:49,724 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:49,725 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:49,783 INFO L321 Elim1Store]: treesize reduction 83, result has 23.9 percent of original size [2022-11-25 22:42:49,783 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 7 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 23 treesize of output 42 [2022-11-25 22:42:49,802 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:49,805 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:49,807 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:49,870 INFO L321 Elim1Store]: treesize reduction 129, result has 17.8 percent of original size [2022-11-25 22:42:49,871 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 9 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 55 treesize of output 73 [2022-11-25 22:42:49,904 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:49,907 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:49,910 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 10 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 35 [2022-11-25 22:42:50,001 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:50,002 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:50,005 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:42:50,006 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:42:50,007 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:42:50,076 INFO L321 Elim1Store]: treesize reduction 235, result has 16.4 percent of original size [2022-11-25 22:42:50,076 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 360 treesize of output 350 [2022-11-25 22:42:50,465 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:42:50,476 INFO L321 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2022-11-25 22:42:50,476 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 1 case distinctions, treesize of input 42 treesize of output 29 [2022-11-25 22:42:50,525 INFO L321 Elim1Store]: treesize reduction 28, result has 49.1 percent of original size [2022-11-25 22:42:50,525 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 48 treesize of output 50 [2022-11-25 22:42:50,568 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:42:50,569 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:42:50,602 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-11-25 22:42:50,602 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 78 treesize of output 65 [2022-11-25 22:42:50,640 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2022-11-25 22:42:50,654 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 22:42:51,072 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1959#(and (exists ((|v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_6| Int) (|v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_6| Int)) (and (= |__VERIFIER_assert_#in~cond| (ite (= (select (select |#memory_int| |v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_6|) 0) (select (select |#memory_int| |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_6|) 0)) 1 0)) (<= 0 |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_6|) (<= 0 |v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_6|))) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 22:42:51,072 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 22:42:51,072 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 22:42:51,073 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 50 [2022-11-25 22:42:51,073 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1599747474] [2022-11-25 22:42:51,073 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 22:42:51,073 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2022-11-25 22:42:51,074 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 22:42:51,075 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2022-11-25 22:42:51,076 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1300, Invalid=2122, Unknown=0, NotChecked=0, Total=3422 [2022-11-25 22:42:51,076 INFO L87 Difference]: Start difference. First operand 50 states and 55 transitions. Second operand has 51 states, 51 states have (on average 1.1568627450980393) internal successors, (59), 50 states have internal predecessors, (59), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:42:51,199 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 22:42:51,199 INFO L93 Difference]: Finished difference Result 100 states and 134 transitions. [2022-11-25 22:42:51,200 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2022-11-25 22:42:51,200 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 1.1568627450980393) internal successors, (59), 50 states have internal predecessors, (59), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 42 [2022-11-25 22:42:51,201 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 22:42:51,204 INFO L225 Difference]: With dead ends: 100 [2022-11-25 22:42:51,204 INFO L226 Difference]: Without dead ends: 75 [2022-11-25 22:42:51,207 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 92 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 674 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1300, Invalid=2122, Unknown=0, NotChecked=0, Total=3422 [2022-11-25 22:42:51,210 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 81 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 81 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 22:42:51,211 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 70 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 81 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 22:42:51,212 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2022-11-25 22:42:51,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2022-11-25 22:42:51,245 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 71 states have (on average 1.0704225352112675) internal successors, (76), 71 states have internal predecessors, (76), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-25 22:42:51,246 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 80 transitions. [2022-11-25 22:42:51,246 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 80 transitions. Word has length 42 [2022-11-25 22:42:51,246 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 22:42:51,247 INFO L495 AbstractCegarLoop]: Abstraction has 75 states and 80 transitions. [2022-11-25 22:42:51,247 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 1.1568627450980393) internal successors, (59), 50 states have internal predecessors, (59), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:42:51,247 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 80 transitions. [2022-11-25 22:42:51,248 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2022-11-25 22:42:51,248 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 22:42:51,248 INFO L195 NwaCegarLoop]: trace histogram [48, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 22:42:51,259 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_534f5968-fdda-4df7-a171-93cfaeba1503/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2022-11-25 22:42:51,455 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_534f5968-fdda-4df7-a171-93cfaeba1503/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:42:51,456 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 22:42:51,456 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 22:42:51,456 INFO L85 PathProgramCache]: Analyzing trace with hash 939129208, now seen corresponding path program 7 times [2022-11-25 22:42:51,457 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 22:42:51,457 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1168165897] [2022-11-25 22:42:51,457 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:42:51,457 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 22:42:51,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:42:54,185 INFO L134 CoverageAnalysis]: Checked inductivity of 1231 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-11-25 22:42:54,186 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 22:42:54,186 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1168165897] [2022-11-25 22:42:54,186 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1168165897] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 22:42:54,186 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [8874345] [2022-11-25 22:42:54,187 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 22:42:54,187 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:42:54,187 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_534f5968-fdda-4df7-a171-93cfaeba1503/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 22:42:54,195 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_534f5968-fdda-4df7-a171-93cfaeba1503/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 22:42:54,198 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_534f5968-fdda-4df7-a171-93cfaeba1503/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-25 22:42:54,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:42:54,517 INFO L263 TraceCheckSpWp]: Trace formula consists of 980 conjuncts, 50 conjunts are in the unsatisfiable core [2022-11-25 22:42:54,520 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 22:42:54,666 INFO L134 CoverageAnalysis]: Checked inductivity of 1231 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-11-25 22:42:54,666 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 22:42:58,034 INFO L134 CoverageAnalysis]: Checked inductivity of 1231 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-11-25 22:42:58,034 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [8874345] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 22:42:58,035 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [97024426] [2022-11-25 22:42:58,036 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-25 22:42:58,037 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 22:42:58,037 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 22:42:58,037 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 22:42:58,037 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 22:42:58,063 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:58,065 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:58,066 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:58,116 INFO L321 Elim1Store]: treesize reduction 83, result has 23.9 percent of original size [2022-11-25 22:42:58,117 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 7 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 23 treesize of output 42 [2022-11-25 22:42:58,140 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:58,143 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:58,146 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:58,210 INFO L321 Elim1Store]: treesize reduction 129, result has 17.8 percent of original size [2022-11-25 22:42:58,211 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 9 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 55 treesize of output 73 [2022-11-25 22:42:58,272 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:58,273 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:58,275 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 10 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 35 [2022-11-25 22:42:58,378 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:58,379 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:58,383 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:42:58,384 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:42:58,385 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:42:58,452 INFO L321 Elim1Store]: treesize reduction 235, result has 16.4 percent of original size [2022-11-25 22:42:58,453 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 360 treesize of output 350 [2022-11-25 22:42:58,827 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:42:58,839 INFO L321 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2022-11-25 22:42:58,840 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 1 case distinctions, treesize of input 42 treesize of output 29 [2022-11-25 22:42:58,863 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:42:58,864 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:42:58,893 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-11-25 22:42:58,894 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 78 treesize of output 65 [2022-11-25 22:42:58,937 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:42:58,938 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:42:58,988 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-11-25 22:42:58,988 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 78 treesize of output 65 [2022-11-25 22:42:59,040 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2022-11-25 22:42:59,059 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 22:42:59,645 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2785#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (exists ((|v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_7| Int) (|v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_7| Int)) (and (<= 0 |v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_7|) (= |__VERIFIER_assert_#in~cond| (ite (= (select (select |#memory_int| |v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_7|) 0) (select (select |#memory_int| |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_7|) 0)) 1 0)) (<= 0 |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_7|))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 22:42:59,645 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 22:42:59,646 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 22:42:59,646 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50] total 100 [2022-11-25 22:42:59,646 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [167109244] [2022-11-25 22:42:59,646 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 22:42:59,647 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 101 states [2022-11-25 22:42:59,647 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 22:42:59,650 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2022-11-25 22:42:59,654 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5075, Invalid=6697, Unknown=0, NotChecked=0, Total=11772 [2022-11-25 22:42:59,655 INFO L87 Difference]: Start difference. First operand 75 states and 80 transitions. Second operand has 101 states, 101 states have (on average 1.0792079207920793) internal successors, (109), 100 states have internal predecessors, (109), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:42:59,845 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 22:42:59,845 INFO L93 Difference]: Finished difference Result 150 states and 209 transitions. [2022-11-25 22:42:59,846 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2022-11-25 22:42:59,846 INFO L78 Accepts]: Start accepts. Automaton has has 101 states, 101 states have (on average 1.0792079207920793) internal successors, (109), 100 states have internal predecessors, (109), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 67 [2022-11-25 22:42:59,847 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 22:42:59,847 INFO L225 Difference]: With dead ends: 150 [2022-11-25 22:42:59,847 INFO L226 Difference]: Without dead ends: 125 [2022-11-25 22:42:59,851 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 249 GetRequests, 142 SyntacticMatches, 0 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1374 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=5075, Invalid=6697, Unknown=0, NotChecked=0, Total=11772 [2022-11-25 22:42:59,851 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 84 mSDsCounter, 0 mSdLazyCounter, 143 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 144 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 143 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 22:42:59,852 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 98 Invalid, 144 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 143 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 22:42:59,852 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2022-11-25 22:42:59,863 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 125. [2022-11-25 22:42:59,863 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 121 states have (on average 1.0413223140495869) internal successors, (126), 121 states have internal predecessors, (126), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-25 22:42:59,864 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 130 transitions. [2022-11-25 22:42:59,864 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 130 transitions. Word has length 67 [2022-11-25 22:42:59,864 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 22:42:59,864 INFO L495 AbstractCegarLoop]: Abstraction has 125 states and 130 transitions. [2022-11-25 22:42:59,865 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 101 states, 101 states have (on average 1.0792079207920793) internal successors, (109), 100 states have internal predecessors, (109), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:42:59,865 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 130 transitions. [2022-11-25 22:42:59,866 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2022-11-25 22:42:59,867 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 22:42:59,867 INFO L195 NwaCegarLoop]: trace histogram [98, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 22:42:59,878 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_534f5968-fdda-4df7-a171-93cfaeba1503/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-25 22:43:00,073 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_534f5968-fdda-4df7-a171-93cfaeba1503/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:43:00,073 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 22:43:00,074 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 22:43:00,074 INFO L85 PathProgramCache]: Analyzing trace with hash 760188856, now seen corresponding path program 8 times [2022-11-25 22:43:00,074 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 22:43:00,074 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1720386844] [2022-11-25 22:43:00,074 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:43:00,074 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 22:43:00,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:43:08,761 INFO L134 CoverageAnalysis]: Checked inductivity of 4906 backedges. 0 proven. 4851 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-11-25 22:43:08,761 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 22:43:08,762 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1720386844] [2022-11-25 22:43:08,762 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1720386844] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 22:43:08,762 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1209440344] [2022-11-25 22:43:08,762 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 22:43:08,763 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:43:08,763 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_534f5968-fdda-4df7-a171-93cfaeba1503/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 22:43:08,764 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_534f5968-fdda-4df7-a171-93cfaeba1503/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 22:43:08,767 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_534f5968-fdda-4df7-a171-93cfaeba1503/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-25 22:43:10,188 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-11-25 22:43:10,188 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 22:43:10,193 INFO L263 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-25 22:43:10,198 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 22:43:10,872 INFO L134 CoverageAnalysis]: Checked inductivity of 4906 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 4851 trivial. 0 not checked. [2022-11-25 22:43:10,873 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 22:43:11,623 INFO L134 CoverageAnalysis]: Checked inductivity of 4906 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 4851 trivial. 0 not checked. [2022-11-25 22:43:11,623 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1209440344] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 22:43:11,623 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [931088336] [2022-11-25 22:43:11,625 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-25 22:43:11,625 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 22:43:11,626 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 22:43:11,626 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 22:43:11,626 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 22:43:11,645 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:43:11,646 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:43:11,647 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:43:11,699 INFO L321 Elim1Store]: treesize reduction 83, result has 23.9 percent of original size [2022-11-25 22:43:11,699 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 7 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 23 treesize of output 42 [2022-11-25 22:43:11,719 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:43:11,722 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:43:11,724 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:43:11,796 INFO L321 Elim1Store]: treesize reduction 129, result has 17.8 percent of original size [2022-11-25 22:43:11,797 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 9 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 55 treesize of output 73 [2022-11-25 22:43:11,837 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:43:11,838 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:43:11,841 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 10 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 57 treesize of output 45 [2022-11-25 22:43:11,926 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:43:11,927 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:43:11,928 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:43:11,930 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:43:11,930 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:43:11,934 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:43:11,934 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:43:11,978 INFO L321 Elim1Store]: treesize reduction 135, result has 12.9 percent of original size [2022-11-25 22:43:11,979 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 380 treesize of output 348 [2022-11-25 22:43:12,067 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:43:12,078 INFO L321 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2022-11-25 22:43:12,078 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 1 case distinctions, treesize of input 42 treesize of output 29 [2022-11-25 22:43:12,101 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:43:12,102 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:43:12,132 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-11-25 22:43:12,132 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 78 treesize of output 65 [2022-11-25 22:43:12,178 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:43:12,179 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:43:12,208 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-11-25 22:43:12,209 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 78 treesize of output 65 [2022-11-25 22:43:12,295 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:43:12,295 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:43:12,327 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-11-25 22:43:12,327 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 78 treesize of output 65 [2022-11-25 22:43:12,355 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2022-11-25 22:43:12,367 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 22:43:13,246 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4133#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (exists ((|v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_8| Int) (|v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_8| Int)) (and (= |__VERIFIER_assert_#in~cond| (ite (= (select (select |#memory_int| |v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_8|) 0) (select (select |#memory_int| |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_8|) 0)) 1 0)) (<= 0 |v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_8|) (<= 0 |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_8|))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 22:43:13,246 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 22:43:13,246 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 22:43:13,246 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [100, 12, 12] total 122 [2022-11-25 22:43:13,246 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1083245764] [2022-11-25 22:43:13,246 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 22:43:13,247 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 123 states [2022-11-25 22:43:13,247 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 22:43:13,249 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 123 interpolants. [2022-11-25 22:43:13,255 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5372, Invalid=11658, Unknown=0, NotChecked=0, Total=17030 [2022-11-25 22:43:13,255 INFO L87 Difference]: Start difference. First operand 125 states and 130 transitions. Second operand has 123 states, 123 states have (on average 1.0975609756097562) internal successors, (135), 122 states have internal predecessors, (135), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:43:18,616 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 22:43:18,616 INFO L93 Difference]: Finished difference Result 163 states and 185 transitions. [2022-11-25 22:43:18,616 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 123 states. [2022-11-25 22:43:18,617 INFO L78 Accepts]: Start accepts. Automaton has has 123 states, 123 states have (on average 1.0975609756097562) internal successors, (135), 122 states have internal predecessors, (135), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 117 [2022-11-25 22:43:18,617 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 22:43:18,618 INFO L225 Difference]: With dead ends: 163 [2022-11-25 22:43:18,618 INFO L226 Difference]: Without dead ends: 138 [2022-11-25 22:43:18,624 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 548 GetRequests, 320 SyntacticMatches, 0 SemanticMatches, 228 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8458 ImplicationChecksByTransitivity, 10.9s TimeCoverageRelationStatistics Valid=17549, Invalid=35121, Unknown=0, NotChecked=0, Total=52670 [2022-11-25 22:43:18,625 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 168 mSDsCounter, 0 mSdLazyCounter, 195 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 182 SdHoareTripleChecker+Invalid, 196 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 195 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-25 22:43:18,626 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 182 Invalid, 196 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 195 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-25 22:43:18,626 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2022-11-25 22:43:18,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 138. [2022-11-25 22:43:18,637 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 138 states, 134 states have (on average 1.037313432835821) internal successors, (139), 134 states have internal predecessors, (139), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-25 22:43:18,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 143 transitions. [2022-11-25 22:43:18,638 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 143 transitions. Word has length 117 [2022-11-25 22:43:18,639 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 22:43:18,639 INFO L495 AbstractCegarLoop]: Abstraction has 138 states and 143 transitions. [2022-11-25 22:43:18,639 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 123 states, 123 states have (on average 1.0975609756097562) internal successors, (135), 122 states have internal predecessors, (135), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:43:18,640 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 143 transitions. [2022-11-25 22:43:18,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2022-11-25 22:43:18,641 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 22:43:18,641 INFO L195 NwaCegarLoop]: trace histogram [99, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 22:43:18,651 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_534f5968-fdda-4df7-a171-93cfaeba1503/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-25 22:43:18,849 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_534f5968-fdda-4df7-a171-93cfaeba1503/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-11-25 22:43:18,849 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 22:43:18,850 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 22:43:18,850 INFO L85 PathProgramCache]: Analyzing trace with hash -997656454, now seen corresponding path program 9 times [2022-11-25 22:43:18,850 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 22:43:18,850 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1697116562] [2022-11-25 22:43:18,850 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:43:18,850 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 22:43:19,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:43:26,799 INFO L134 CoverageAnalysis]: Checked inductivity of 5203 backedges. 0 proven. 4950 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2022-11-25 22:43:26,799 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 22:43:26,799 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1697116562] [2022-11-25 22:43:26,799 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1697116562] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 22:43:26,799 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1409874979] [2022-11-25 22:43:26,799 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 22:43:26,799 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:43:26,799 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_534f5968-fdda-4df7-a171-93cfaeba1503/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 22:43:26,800 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_534f5968-fdda-4df7-a171-93cfaeba1503/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 22:43:26,803 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_534f5968-fdda-4df7-a171-93cfaeba1503/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-25 22:43:27,517 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 22:43:27,517 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 22:43:27,530 INFO L263 TraceCheckSpWp]: Trace formula consists of 1943 conjuncts, 101 conjunts are in the unsatisfiable core [2022-11-25 22:43:27,537 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 22:43:27,767 INFO L134 CoverageAnalysis]: Checked inductivity of 5203 backedges. 0 proven. 4950 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2022-11-25 22:43:27,767 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 22:43:39,965 INFO L134 CoverageAnalysis]: Checked inductivity of 5203 backedges. 0 proven. 4950 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2022-11-25 22:43:39,965 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1409874979] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 22:43:39,965 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [193174349] [2022-11-25 22:43:39,967 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-25 22:43:39,967 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 22:43:39,967 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 22:43:39,967 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 22:43:39,968 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 22:43:39,981 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:43:39,982 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:43:39,983 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:43:40,031 INFO L321 Elim1Store]: treesize reduction 83, result has 23.9 percent of original size [2022-11-25 22:43:40,031 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 7 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 23 treesize of output 42 [2022-11-25 22:43:40,047 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:43:40,049 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:43:40,051 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:43:40,113 INFO L321 Elim1Store]: treesize reduction 129, result has 17.8 percent of original size [2022-11-25 22:43:40,113 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 9 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 55 treesize of output 73 [2022-11-25 22:43:40,148 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:43:40,149 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:43:40,151 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 10 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 57 treesize of output 45 [2022-11-25 22:43:40,221 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:43:40,222 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:43:40,224 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:43:40,225 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:43:40,226 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:43:40,229 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:43:40,230 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:43:40,262 INFO L321 Elim1Store]: treesize reduction 135, result has 12.9 percent of original size [2022-11-25 22:43:40,263 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 380 treesize of output 348 [2022-11-25 22:43:40,335 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:43:40,347 INFO L321 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2022-11-25 22:43:40,347 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 1 case distinctions, treesize of input 42 treesize of output 29 [2022-11-25 22:43:40,368 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:43:40,368 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:43:40,396 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-11-25 22:43:40,396 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 78 treesize of output 65 [2022-11-25 22:43:40,445 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:43:40,445 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:43:40,474 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-11-25 22:43:40,475 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 78 treesize of output 65 [2022-11-25 22:43:40,560 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:43:40,561 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:43:40,589 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-11-25 22:43:40,589 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 78 treesize of output 65 [2022-11-25 22:43:40,617 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2022-11-25 22:43:40,631 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 22:43:41,445 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5889#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (exists ((|v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_9| Int) (|v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_9| Int)) (and (<= 0 |v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_9|) (<= 0 |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_9|) (= (ite (= (select (select |#memory_int| |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_9|) 0) (select (select |#memory_int| |v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_9|) 0)) 1 0) |__VERIFIER_assert_#in~cond|))) (= |#NULL.base| 0))' at error location [2022-11-25 22:43:41,445 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 22:43:41,445 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 22:43:41,445 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [101, 101, 101] total 202 [2022-11-25 22:43:41,445 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [314145543] [2022-11-25 22:43:41,446 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 22:43:41,446 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 203 states [2022-11-25 22:43:41,447 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 22:43:41,453 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 203 interpolants. [2022-11-25 22:43:41,458 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20528, Invalid=23782, Unknown=0, NotChecked=0, Total=44310 [2022-11-25 22:43:41,458 INFO L87 Difference]: Start difference. First operand 138 states and 143 transitions. Second operand has 203 states, 203 states have (on average 1.0394088669950738) internal successors, (211), 202 states have internal predecessors, (211), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:43:42,008 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 22:43:42,008 INFO L93 Difference]: Finished difference Result 276 states and 386 transitions. [2022-11-25 22:43:42,009 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 202 states. [2022-11-25 22:43:42,009 INFO L78 Accepts]: Start accepts. Automaton has has 203 states, 203 states have (on average 1.0394088669950738) internal successors, (211), 202 states have internal predecessors, (211), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 130 [2022-11-25 22:43:42,010 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 22:43:42,011 INFO L225 Difference]: With dead ends: 276 [2022-11-25 22:43:42,011 INFO L226 Difference]: Without dead ends: 239 [2022-11-25 22:43:42,013 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 489 GetRequests, 280 SyntacticMatches, 0 SemanticMatches, 209 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2802 ImplicationChecksByTransitivity, 16.9s TimeCoverageRelationStatistics Valid=20528, Invalid=23782, Unknown=0, NotChecked=0, Total=44310 [2022-11-25 22:43:42,014 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 112 mSDsCounter, 0 mSdLazyCounter, 257 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 126 SdHoareTripleChecker+Invalid, 258 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 257 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-25 22:43:42,014 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 126 Invalid, 258 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 257 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-25 22:43:42,015 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 239 states. [2022-11-25 22:43:42,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 239 to 239. [2022-11-25 22:43:42,030 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 239 states, 235 states have (on average 1.0212765957446808) internal successors, (240), 235 states have internal predecessors, (240), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-25 22:43:42,031 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 239 states to 239 states and 244 transitions. [2022-11-25 22:43:42,031 INFO L78 Accepts]: Start accepts. Automaton has 239 states and 244 transitions. Word has length 130 [2022-11-25 22:43:42,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 22:43:42,032 INFO L495 AbstractCegarLoop]: Abstraction has 239 states and 244 transitions. [2022-11-25 22:43:42,032 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 203 states, 203 states have (on average 1.0394088669950738) internal successors, (211), 202 states have internal predecessors, (211), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:43:42,033 INFO L276 IsEmpty]: Start isEmpty. Operand 239 states and 244 transitions. [2022-11-25 22:43:42,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 232 [2022-11-25 22:43:42,036 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 22:43:42,036 INFO L195 NwaCegarLoop]: trace histogram [200, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 22:43:42,045 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_534f5968-fdda-4df7-a171-93cfaeba1503/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-25 22:43:42,245 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_534f5968-fdda-4df7-a171-93cfaeba1503/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-11-25 22:43:42,245 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 22:43:42,245 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 22:43:42,245 INFO L85 PathProgramCache]: Analyzing trace with hash -113899976, now seen corresponding path program 10 times [2022-11-25 22:43:42,245 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 22:43:42,246 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [942954599] [2022-11-25 22:43:42,246 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:43:42,246 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 22:43:42,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:44:10,454 INFO L134 CoverageAnalysis]: Checked inductivity of 20353 backedges. 0 proven. 20100 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2022-11-25 22:44:10,454 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 22:44:10,454 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [942954599] [2022-11-25 22:44:10,454 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [942954599] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 22:44:10,454 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1371893976] [2022-11-25 22:44:10,454 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 22:44:10,454 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:44:10,455 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_534f5968-fdda-4df7-a171-93cfaeba1503/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 22:44:10,456 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_534f5968-fdda-4df7-a171-93cfaeba1503/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 22:44:10,458 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_534f5968-fdda-4df7-a171-93cfaeba1503/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-25 22:44:11,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:44:11,580 INFO L263 TraceCheckSpWp]: Trace formula consists of 3660 conjuncts, 202 conjunts are in the unsatisfiable core [2022-11-25 22:44:11,591 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 22:44:11,966 INFO L134 CoverageAnalysis]: Checked inductivity of 20353 backedges. 0 proven. 20100 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2022-11-25 22:44:11,966 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 22:45:01,262 INFO L134 CoverageAnalysis]: Checked inductivity of 20353 backedges. 0 proven. 20100 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2022-11-25 22:45:01,262 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1371893976] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 22:45:01,262 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [154354420] [2022-11-25 22:45:01,263 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-25 22:45:01,263 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 22:45:01,264 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 22:45:01,264 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 22:45:01,264 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 22:45:01,288 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:45:01,291 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:45:01,293 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:45:01,349 INFO L321 Elim1Store]: treesize reduction 129, result has 17.8 percent of original size [2022-11-25 22:45:01,349 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 9 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 55 treesize of output 73 [2022-11-25 22:45:01,364 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:45:01,365 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:45:01,365 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:45:01,369 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 13 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 32 [2022-11-25 22:45:01,391 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:45:01,392 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:45:01,394 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 10 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 57 treesize of output 45 [2022-11-25 22:45:01,484 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:45:01,486 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:45:01,487 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:45:01,488 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:45:01,489 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:45:01,492 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:45:01,494 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:45:01,533 INFO L321 Elim1Store]: treesize reduction 135, result has 12.9 percent of original size [2022-11-25 22:45:01,533 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 380 treesize of output 348 [2022-11-25 22:45:01,610 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:45:01,621 INFO L321 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2022-11-25 22:45:01,622 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 1 case distinctions, treesize of input 42 treesize of output 29 [2022-11-25 22:45:01,675 INFO L321 Elim1Store]: treesize reduction 28, result has 49.1 percent of original size [2022-11-25 22:45:01,676 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 48 treesize of output 50 [2022-11-25 22:45:01,720 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:45:01,721 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:45:01,749 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-11-25 22:45:01,750 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 78 treesize of output 65 [2022-11-25 22:45:01,781 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2022-11-25 22:45:01,797 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 22:45:03,406 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8683#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (exists ((|v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_10| Int) (|v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_10| Int)) (and (<= 0 |v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_10|) (<= 0 |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_10|) (= |__VERIFIER_assert_#in~cond| (ite (= (select (select |#memory_int| |v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_10|) 0) (select (select |#memory_int| |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_10|) 0)) 1 0)))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 22:45:03,406 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 22:45:03,406 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 22:45:03,407 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [202, 202, 202] total 404 [2022-11-25 22:45:03,407 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1456441010] [2022-11-25 22:45:03,407 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 22:45:03,408 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 405 states [2022-11-25 22:45:03,408 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 22:45:03,429 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 405 interpolants. [2022-11-25 22:45:03,438 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81835, Invalid=88321, Unknown=0, NotChecked=0, Total=170156 [2022-11-25 22:45:03,439 INFO L87 Difference]: Start difference. First operand 239 states and 244 transitions. Second operand has 405 states, 405 states have (on average 1.019753086419753) internal successors, (413), 404 states have internal predecessors, (413), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:45:05,857 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 22:45:05,858 INFO L93 Difference]: Finished difference Result 478 states and 689 transitions. [2022-11-25 22:45:05,858 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 404 states. [2022-11-25 22:45:05,859 INFO L78 Accepts]: Start accepts. Automaton has has 405 states, 405 states have (on average 1.019753086419753) internal successors, (413), 404 states have internal predecessors, (413), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 231 [2022-11-25 22:45:05,859 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 22:45:05,862 INFO L225 Difference]: With dead ends: 478 [2022-11-25 22:45:05,862 INFO L226 Difference]: Without dead ends: 441 [2022-11-25 22:45:05,869 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 893 GetRequests, 482 SyntacticMatches, 0 SemanticMatches, 411 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5630 ImplicationChecksByTransitivity, 66.4s TimeCoverageRelationStatistics Valid=81835, Invalid=88321, Unknown=0, NotChecked=0, Total=170156 [2022-11-25 22:45:05,869 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 70 mSDsCounter, 0 mSdLazyCounter, 440 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 441 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 440 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-25 22:45:05,870 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 84 Invalid, 441 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 440 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-25 22:45:05,871 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 441 states. [2022-11-25 22:45:05,897 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 441 to 441. [2022-11-25 22:45:05,898 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 441 states, 437 states have (on average 1.011441647597254) internal successors, (442), 437 states have internal predecessors, (442), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-25 22:45:05,900 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 441 states to 441 states and 446 transitions. [2022-11-25 22:45:05,900 INFO L78 Accepts]: Start accepts. Automaton has 441 states and 446 transitions. Word has length 231 [2022-11-25 22:45:05,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 22:45:05,901 INFO L495 AbstractCegarLoop]: Abstraction has 441 states and 446 transitions. [2022-11-25 22:45:05,902 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 405 states, 405 states have (on average 1.019753086419753) internal successors, (413), 404 states have internal predecessors, (413), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:45:05,902 INFO L276 IsEmpty]: Start isEmpty. Operand 441 states and 446 transitions. [2022-11-25 22:45:05,911 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 434 [2022-11-25 22:45:05,911 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 22:45:05,911 INFO L195 NwaCegarLoop]: trace histogram [402, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 22:45:05,924 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_534f5968-fdda-4df7-a171-93cfaeba1503/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-11-25 22:45:06,123 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_534f5968-fdda-4df7-a171-93cfaeba1503/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-11-25 22:45:06,124 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 22:45:06,124 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 22:45:06,124 INFO L85 PathProgramCache]: Analyzing trace with hash -1510019208, now seen corresponding path program 11 times [2022-11-25 22:45:06,124 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 22:45:06,124 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1604358976] [2022-11-25 22:45:06,124 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:45:06,124 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 22:45:07,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:47:01,396 INFO L134 CoverageAnalysis]: Checked inductivity of 81256 backedges. 0 proven. 81003 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2022-11-25 22:47:01,397 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 22:47:01,397 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1604358976] [2022-11-25 22:47:01,397 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1604358976] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 22:47:01,397 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1411429692] [2022-11-25 22:47:01,398 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 22:47:01,398 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:47:01,399 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_534f5968-fdda-4df7-a171-93cfaeba1503/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 22:47:01,406 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_534f5968-fdda-4df7-a171-93cfaeba1503/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 22:47:01,411 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_534f5968-fdda-4df7-a171-93cfaeba1503/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-25 22:47:50,702 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2022-11-25 22:47:50,702 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 22:47:50,735 INFO L263 TraceCheckSpWp]: Trace formula consists of 634 conjuncts, 24 conjunts are in the unsatisfiable core [2022-11-25 22:47:50,743 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 22:47:55,322 INFO L134 CoverageAnalysis]: Checked inductivity of 81256 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 81003 trivial. 0 not checked. [2022-11-25 22:47:55,322 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 22:48:00,496 INFO L134 CoverageAnalysis]: Checked inductivity of 81256 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 81003 trivial. 0 not checked. [2022-11-25 22:48:00,497 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1411429692] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 22:48:00,497 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [590505841] [2022-11-25 22:48:00,499 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-25 22:48:00,499 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 22:48:00,499 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 22:48:00,499 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 22:48:00,499 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 22:48:00,515 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:48:00,516 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:48:00,517 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:48:00,565 INFO L321 Elim1Store]: treesize reduction 83, result has 23.9 percent of original size [2022-11-25 22:48:00,565 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 7 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 23 treesize of output 42 [2022-11-25 22:48:00,587 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:48:00,590 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:48:00,592 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:48:00,653 INFO L321 Elim1Store]: treesize reduction 129, result has 17.8 percent of original size [2022-11-25 22:48:00,653 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 9 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 55 treesize of output 73 [2022-11-25 22:48:00,694 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:48:00,695 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:48:00,697 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 10 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 57 treesize of output 45 [2022-11-25 22:48:00,770 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:48:00,771 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:48:00,772 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:48:00,773 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:48:00,774 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:48:00,776 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:48:00,777 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:48:00,811 INFO L321 Elim1Store]: treesize reduction 135, result has 12.9 percent of original size [2022-11-25 22:48:00,811 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 380 treesize of output 348 [2022-11-25 22:48:00,892 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:48:00,904 INFO L321 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2022-11-25 22:48:00,904 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 1 case distinctions, treesize of input 42 treesize of output 29 [2022-11-25 22:48:00,922 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:48:00,923 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:48:00,950 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-11-25 22:48:00,951 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 78 treesize of output 65 [2022-11-25 22:48:00,992 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:48:00,993 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:48:01,029 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-11-25 22:48:01,030 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 78 treesize of output 65 [2022-11-25 22:48:01,061 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2022-11-25 22:48:01,073 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 22:48:03,991 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13543#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (exists ((|v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_11| Int) (|v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_11| Int)) (and (<= 0 |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_11|) (= |__VERIFIER_assert_#in~cond| (ite (= (select (select |#memory_int| |v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_11|) 0) (select (select |#memory_int| |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_11|) 0)) 1 0)) (<= 0 |v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_11|))) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 22:48:03,991 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 22:48:03,991 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 22:48:03,991 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [404, 24, 24] total 450 [2022-11-25 22:48:03,992 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1987670660] [2022-11-25 22:48:03,992 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 22:48:03,993 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 451 states [2022-11-25 22:48:03,993 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 22:48:04,006 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 451 interpolants. [2022-11-25 22:48:04,015 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83008, Invalid=127214, Unknown=0, NotChecked=0, Total=210222 [2022-11-25 22:48:04,015 INFO L87 Difference]: Start difference. First operand 441 states and 446 transitions. Second operand has 451 states, 451 states have (on average 1.0266075388026608) internal successors, (463), 450 states have internal predecessors, (463), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:49:31,181 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 22:49:31,181 INFO L93 Difference]: Finished difference Result 503 states and 537 transitions. [2022-11-25 22:49:31,182 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 451 states. [2022-11-25 22:49:31,182 INFO L78 Accepts]: Start accepts. Automaton has has 451 states, 451 states have (on average 1.0266075388026608) internal successors, (463), 450 states have internal predecessors, (463), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 433 [2022-11-25 22:49:31,183 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 22:49:31,185 INFO L225 Difference]: With dead ends: 503 [2022-11-25 22:49:31,185 INFO L226 Difference]: Without dead ends: 466 [2022-11-25 22:49:31,235 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2104 GetRequests, 1244 SyntacticMatches, 0 SemanticMatches, 860 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 104894 ImplicationChecksByTransitivity, 152.3s TimeCoverageRelationStatistics Valid=264761, Invalid=477421, Unknown=0, NotChecked=0, Total=742182 [2022-11-25 22:49:31,235 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 126 mSDsCounter, 0 mSdLazyCounter, 505 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 140 SdHoareTripleChecker+Invalid, 506 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 505 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-25 22:49:31,236 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 140 Invalid, 506 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 505 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-25 22:49:31,237 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 466 states. [2022-11-25 22:49:31,263 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 466 to 466. [2022-11-25 22:49:31,264 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 466 states, 462 states have (on average 1.0108225108225108) internal successors, (467), 462 states have internal predecessors, (467), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-25 22:49:31,265 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 466 states to 466 states and 471 transitions. [2022-11-25 22:49:31,266 INFO L78 Accepts]: Start accepts. Automaton has 466 states and 471 transitions. Word has length 433 [2022-11-25 22:49:31,266 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 22:49:31,266 INFO L495 AbstractCegarLoop]: Abstraction has 466 states and 471 transitions. [2022-11-25 22:49:31,267 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 451 states, 451 states have (on average 1.0266075388026608) internal successors, (463), 450 states have internal predecessors, (463), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:49:31,267 INFO L276 IsEmpty]: Start isEmpty. Operand 466 states and 471 transitions. [2022-11-25 22:49:31,270 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 459 [2022-11-25 22:49:31,270 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 22:49:31,271 INFO L195 NwaCegarLoop]: trace histogram [403, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 22:49:31,291 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_534f5968-fdda-4df7-a171-93cfaeba1503/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-25 22:49:31,489 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_534f5968-fdda-4df7-a171-93cfaeba1503/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-11-25 22:49:31,490 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 22:49:31,490 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 22:49:31,490 INFO L85 PathProgramCache]: Analyzing trace with hash 497319930, now seen corresponding path program 12 times [2022-11-25 22:49:31,490 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 22:49:31,490 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [491405961] [2022-11-25 22:49:31,490 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:49:31,490 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 22:49:32,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:51:32,047 INFO L134 CoverageAnalysis]: Checked inductivity of 82487 backedges. 0 proven. 81406 refuted. 0 times theorem prover too weak. 1081 trivial. 0 not checked. [2022-11-25 22:51:32,047 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 22:51:32,047 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [491405961] [2022-11-25 22:51:32,048 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [491405961] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 22:51:32,048 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [869515751] [2022-11-25 22:51:32,048 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 22:51:32,048 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:51:32,048 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_534f5968-fdda-4df7-a171-93cfaeba1503/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 22:51:32,051 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_534f5968-fdda-4df7-a171-93cfaeba1503/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 22:51:32,051 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_534f5968-fdda-4df7-a171-93cfaeba1503/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-25 22:51:34,492 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 22:51:34,492 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 22:51:34,544 INFO L263 TraceCheckSpWp]: Trace formula consists of 7303 conjuncts, 405 conjunts are in the unsatisfiable core [2022-11-25 22:51:34,556 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 22:51:35,382 INFO L134 CoverageAnalysis]: Checked inductivity of 82487 backedges. 0 proven. 81406 refuted. 0 times theorem prover too weak. 1081 trivial. 0 not checked. [2022-11-25 22:51:35,382 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 22:55:11,624 INFO L134 CoverageAnalysis]: Checked inductivity of 82487 backedges. 0 proven. 81406 refuted. 0 times theorem prover too weak. 1081 trivial. 0 not checked. [2022-11-25 22:55:11,625 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [869515751] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 22:55:11,625 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [915838446] [2022-11-25 22:55:11,627 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-25 22:55:11,627 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 22:55:11,628 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 22:55:11,628 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 22:55:11,628 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 22:55:11,643 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:55:11,644 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:55:11,645 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:55:11,706 INFO L321 Elim1Store]: treesize reduction 83, result has 23.9 percent of original size [2022-11-25 22:55:11,706 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 7 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 23 treesize of output 42 [2022-11-25 22:55:11,729 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:55:11,732 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:55:11,734 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:55:11,811 INFO L321 Elim1Store]: treesize reduction 129, result has 17.8 percent of original size [2022-11-25 22:55:11,811 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 9 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 55 treesize of output 73 [2022-11-25 22:55:11,846 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:55:11,847 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:55:11,849 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 10 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 35 [2022-11-25 22:55:12,108 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:55:12,109 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:55:12,113 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:55:12,114 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:55:12,115 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:55:12,194 INFO L321 Elim1Store]: treesize reduction 235, result has 16.4 percent of original size [2022-11-25 22:55:12,194 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 360 treesize of output 350 [2022-11-25 22:55:12,538 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:55:12,551 INFO L321 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2022-11-25 22:55:12,551 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 1 case distinctions, treesize of input 42 treesize of output 29 [2022-11-25 22:55:12,602 INFO L321 Elim1Store]: treesize reduction 28, result has 49.1 percent of original size [2022-11-25 22:55:12,603 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 48 treesize of output 50 [2022-11-25 22:55:12,643 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:55:12,644 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:55:12,680 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-11-25 22:55:12,680 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 78 treesize of output 65 [2022-11-25 22:55:12,764 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:55:12,765 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:55:12,804 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-11-25 22:55:12,805 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 78 treesize of output 65 [2022-11-25 22:55:12,843 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2022-11-25 22:55:12,858 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 22:55:16,084 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '19819#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (exists ((|v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_12| Int) (|v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_12| Int)) (and (= |__VERIFIER_assert_#in~cond| (ite (= (select (select |#memory_int| |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_12|) 0) (select (select |#memory_int| |v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_12|) 0)) 1 0)) (<= 0 |v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_12|) (<= 0 |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_12|))) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 22:55:16,084 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 22:55:16,084 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 22:55:16,085 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [405, 405, 405] total 810 [2022-11-25 22:55:16,085 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1182867441] [2022-11-25 22:55:16,085 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 22:55:16,087 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 811 states [2022-11-25 22:55:16,087 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 22:55:16,138 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 811 interpolants. [2022-11-25 22:55:16,169 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=328480, Invalid=341462, Unknown=0, NotChecked=0, Total=669942 [2022-11-25 22:55:16,171 INFO L87 Difference]: Start difference. First operand 466 states and 471 transitions. Second operand has 811 states, 811 states have (on average 1.0098643649815042) internal successors, (819), 810 states have internal predecessors, (819), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)