./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-examples/sorting_selectionsort_2_ground.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 6b4ec56b 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_2242b7df-701b-4571-83bb-731a9c181ef3/bin/utaipan-6cKwYrpEi9/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2242b7df-701b-4571-83bb-731a9c181ef3/bin/utaipan-6cKwYrpEi9/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2242b7df-701b-4571-83bb-731a9c181ef3/bin/utaipan-6cKwYrpEi9/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2242b7df-701b-4571-83bb-731a9c181ef3/bin/utaipan-6cKwYrpEi9/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-examples/sorting_selectionsort_2_ground.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2242b7df-701b-4571-83bb-731a9c181ef3/bin/utaipan-6cKwYrpEi9/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2242b7df-701b-4571-83bb-731a9c181ef3/bin/utaipan-6cKwYrpEi9 --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 cae1888d2d961d86748cda3b827a90e6d152bf2b6038710fc1a5581289f20b0c --- 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-6b4ec56 [2022-11-20 21:10:10,551 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-20 21:10:10,554 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-20 21:10:10,602 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-20 21:10:10,602 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-20 21:10:10,607 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-20 21:10:10,609 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-20 21:10:10,613 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-20 21:10:10,616 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-20 21:10:10,619 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-20 21:10:10,622 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-20 21:10:10,625 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-20 21:10:10,625 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-20 21:10:10,633 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-20 21:10:10,638 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-20 21:10:10,639 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-20 21:10:10,640 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-20 21:10:10,642 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-20 21:10:10,644 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-20 21:10:10,647 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-20 21:10:10,653 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-20 21:10:10,655 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-20 21:10:10,656 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-20 21:10:10,657 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-20 21:10:10,661 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-20 21:10:10,662 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-20 21:10:10,662 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-20 21:10:10,663 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-20 21:10:10,664 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-20 21:10:10,665 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-20 21:10:10,665 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-20 21:10:10,666 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-20 21:10:10,667 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-20 21:10:10,668 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-20 21:10:10,669 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-20 21:10:10,669 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-20 21:10:10,670 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-20 21:10:10,671 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-20 21:10:10,671 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-20 21:10:10,672 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-20 21:10:10,673 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-20 21:10:10,674 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2242b7df-701b-4571-83bb-731a9c181ef3/bin/utaipan-6cKwYrpEi9/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-20 21:10:10,723 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-20 21:10:10,724 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-20 21:10:10,724 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-20 21:10:10,725 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-20 21:10:10,726 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-20 21:10:10,726 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-20 21:10:10,726 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-20 21:10:10,726 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-20 21:10:10,727 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-20 21:10:10,727 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-20 21:10:10,728 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-20 21:10:10,729 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-20 21:10:10,729 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-20 21:10:10,729 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-20 21:10:10,729 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-20 21:10:10,729 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-20 21:10:10,730 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-20 21:10:10,730 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-20 21:10:10,731 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-20 21:10:10,731 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-20 21:10:10,731 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-20 21:10:10,731 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-20 21:10:10,732 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-20 21:10:10,732 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-20 21:10:10,732 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-20 21:10:10,732 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-20 21:10:10,733 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-20 21:10:10,733 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-20 21:10:10,734 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-20 21:10:10,734 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-20 21:10:10,734 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-20 21:10:10,735 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-20 21:10:10,735 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-20 21:10:10,735 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-20 21:10:10,735 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-20 21:10:10,736 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-20 21:10:10,736 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-20 21:10:10,736 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-20 21:10:10,736 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-20 21:10:10,736 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-20 21:10:10,737 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-20 21:10:10,737 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_2242b7df-701b-4571-83bb-731a9c181ef3/bin/utaipan-6cKwYrpEi9/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2242b7df-701b-4571-83bb-731a9c181ef3/bin/utaipan-6cKwYrpEi9 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> cae1888d2d961d86748cda3b827a90e6d152bf2b6038710fc1a5581289f20b0c [2022-11-20 21:10:11,047 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-20 21:10:11,083 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-20 21:10:11,085 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-20 21:10:11,086 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-20 21:10:11,087 INFO L275 PluginConnector]: CDTParser initialized [2022-11-20 21:10:11,088 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2242b7df-701b-4571-83bb-731a9c181ef3/bin/utaipan-6cKwYrpEi9/../../sv-benchmarks/c/array-examples/sorting_selectionsort_2_ground.i [2022-11-20 21:10:14,304 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-20 21:10:14,547 INFO L351 CDTParser]: Found 1 translation units. [2022-11-20 21:10:14,548 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2242b7df-701b-4571-83bb-731a9c181ef3/sv-benchmarks/c/array-examples/sorting_selectionsort_2_ground.i [2022-11-20 21:10:14,557 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2242b7df-701b-4571-83bb-731a9c181ef3/bin/utaipan-6cKwYrpEi9/data/8324214ea/2d9459061325414f96f13e6be7995b19/FLAG03957f91c [2022-11-20 21:10:14,580 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2242b7df-701b-4571-83bb-731a9c181ef3/bin/utaipan-6cKwYrpEi9/data/8324214ea/2d9459061325414f96f13e6be7995b19 [2022-11-20 21:10:14,586 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-20 21:10:14,588 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-20 21:10:14,590 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-20 21:10:14,591 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-20 21:10:14,595 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-20 21:10:14,597 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 09:10:14" (1/1) ... [2022-11-20 21:10:14,599 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@25787eb3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 09:10:14, skipping insertion in model container [2022-11-20 21:10:14,599 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 09:10:14" (1/1) ... [2022-11-20 21:10:14,609 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-20 21:10:14,630 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-20 21:10:14,827 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_2242b7df-701b-4571-83bb-731a9c181ef3/sv-benchmarks/c/array-examples/sorting_selectionsort_2_ground.i[823,836] [2022-11-20 21:10:14,854 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-20 21:10:14,864 INFO L203 MainTranslator]: Completed pre-run [2022-11-20 21:10:14,876 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_2242b7df-701b-4571-83bb-731a9c181ef3/sv-benchmarks/c/array-examples/sorting_selectionsort_2_ground.i[823,836] [2022-11-20 21:10:14,892 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-20 21:10:14,907 INFO L208 MainTranslator]: Completed translation [2022-11-20 21:10:14,907 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 09:10:14 WrapperNode [2022-11-20 21:10:14,908 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-20 21:10:14,909 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-20 21:10:14,909 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-20 21:10:14,909 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-20 21:10:14,918 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 09:10:14" (1/1) ... [2022-11-20 21:10:14,928 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 09:10:14" (1/1) ... [2022-11-20 21:10:14,964 INFO L138 Inliner]: procedures = 16, calls = 25, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 114 [2022-11-20 21:10:14,968 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-20 21:10:14,969 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-20 21:10:14,970 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-20 21:10:14,970 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-20 21:10:14,982 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 09:10:14" (1/1) ... [2022-11-20 21:10:14,983 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 09:10:14" (1/1) ... [2022-11-20 21:10:15,000 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 09:10:14" (1/1) ... [2022-11-20 21:10:15,001 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 09:10:14" (1/1) ... [2022-11-20 21:10:15,007 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 09:10:14" (1/1) ... [2022-11-20 21:10:15,013 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 09:10:14" (1/1) ... [2022-11-20 21:10:15,026 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 09:10:14" (1/1) ... [2022-11-20 21:10:15,027 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 09:10:14" (1/1) ... [2022-11-20 21:10:15,030 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-20 21:10:15,031 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-20 21:10:15,031 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-20 21:10:15,031 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-20 21:10:15,032 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 09:10:14" (1/1) ... [2022-11-20 21:10:15,055 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-20 21:10:15,067 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2242b7df-701b-4571-83bb-731a9c181ef3/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:10:15,082 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2242b7df-701b-4571-83bb-731a9c181ef3/bin/utaipan-6cKwYrpEi9/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-20 21:10:15,118 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2242b7df-701b-4571-83bb-731a9c181ef3/bin/utaipan-6cKwYrpEi9/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-20 21:10:15,149 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-20 21:10:15,150 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-20 21:10:15,150 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-11-20 21:10:15,150 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-11-20 21:10:15,150 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-20 21:10:15,150 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-20 21:10:15,151 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-11-20 21:10:15,151 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-11-20 21:10:15,151 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-11-20 21:10:15,151 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-11-20 21:10:15,244 INFO L235 CfgBuilder]: Building ICFG [2022-11-20 21:10:15,246 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-20 21:10:15,542 INFO L276 CfgBuilder]: Performing block encoding [2022-11-20 21:10:15,638 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-20 21:10:15,639 INFO L300 CfgBuilder]: Removed 8 assume(true) statements. [2022-11-20 21:10:15,642 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 09:10:15 BoogieIcfgContainer [2022-11-20 21:10:15,642 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-20 21:10:15,645 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-20 21:10:15,645 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-20 21:10:15,649 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-20 21:10:15,650 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.11 09:10:14" (1/3) ... [2022-11-20 21:10:15,650 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@56920d6e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 09:10:15, skipping insertion in model container [2022-11-20 21:10:15,651 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 09:10:14" (2/3) ... [2022-11-20 21:10:15,651 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@56920d6e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 09:10:15, skipping insertion in model container [2022-11-20 21:10:15,651 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 09:10:15" (3/3) ... [2022-11-20 21:10:15,653 INFO L112 eAbstractionObserver]: Analyzing ICFG sorting_selectionsort_2_ground.i [2022-11-20 21:10:15,675 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-20 21:10:15,676 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-20 21:10:15,729 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-20 21:10:15,736 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;@75a44118, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-20 21:10:15,737 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-20 21:10:15,741 INFO L276 IsEmpty]: Start isEmpty. Operand has 22 states, 16 states have (on average 1.625) internal successors, (26), 17 states have internal predecessors, (26), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-20 21:10:15,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-20 21:10:15,747 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:10:15,748 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 21:10:15,749 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:10:15,755 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:10:15,755 INFO L85 PathProgramCache]: Analyzing trace with hash -355460262, now seen corresponding path program 1 times [2022-11-20 21:10:15,789 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:10:15,790 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [690161945] [2022-11-20 21:10:15,790 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:10:15,791 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:10:15,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:10:16,031 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:10:16,032 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:10:16,033 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [690161945] [2022-11-20 21:10:16,034 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [690161945] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 21:10:16,035 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 21:10:16,035 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-20 21:10:16,037 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2100861160] [2022-11-20 21:10:16,038 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 21:10:16,044 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-20 21:10:16,045 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:10:16,100 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-20 21:10:16,101 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-20 21:10:16,104 INFO L87 Difference]: Start difference. First operand has 22 states, 16 states have (on average 1.625) internal successors, (26), 17 states have internal predecessors, (26), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) 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) [2022-11-20 21:10:16,269 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:10:16,269 INFO L93 Difference]: Finished difference Result 52 states and 84 transitions. [2022-11-20 21:10:16,271 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 21:10:16,272 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 [2022-11-20 21:10:16,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:10:16,280 INFO L225 Difference]: With dead ends: 52 [2022-11-20 21:10:16,280 INFO L226 Difference]: Without dead ends: 31 [2022-11-20 21:10:16,284 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 [2022-11-20 21:10:16,290 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 10 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 21:10:16,291 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 28 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-20 21:10:16,311 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2022-11-20 21:10:16,336 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 23. [2022-11-20 21:10:16,337 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 18 states have (on average 1.4444444444444444) internal successors, (26), 18 states have internal predecessors, (26), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-20 21:10:16,339 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 32 transitions. [2022-11-20 21:10:16,340 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 32 transitions. Word has length 9 [2022-11-20 21:10:16,341 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:10:16,341 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 32 transitions. [2022-11-20 21:10:16,341 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) [2022-11-20 21:10:16,342 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 32 transitions. [2022-11-20 21:10:16,342 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-11-20 21:10:16,343 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:10:16,343 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 21:10:16,343 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-20 21:10:16,344 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:10:16,344 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:10:16,345 INFO L85 PathProgramCache]: Analyzing trace with hash 1639768149, now seen corresponding path program 1 times [2022-11-20 21:10:16,345 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:10:16,345 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [530269504] [2022-11-20 21:10:16,345 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:10:16,346 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:10:16,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:10:16,472 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:10:16,472 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:10:16,473 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [530269504] [2022-11-20 21:10:16,474 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [530269504] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 21:10:16,474 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [182928216] [2022-11-20 21:10:16,474 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:10:16,475 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:10:16,475 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2242b7df-701b-4571-83bb-731a9c181ef3/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:10:16,479 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2242b7df-701b-4571-83bb-731a9c181ef3/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 21:10:16,503 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2242b7df-701b-4571-83bb-731a9c181ef3/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-20 21:10:16,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:10:16,578 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-20 21:10:16,595 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 21:10:16,649 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:10:16,649 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 21:10:16,690 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:10:16,695 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [182928216] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 21:10:16,696 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1388271471] [2022-11-20 21:10:16,727 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-20 21:10:16,728 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 21:10:16,732 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 21:10:16,742 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 21:10:16,744 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 21:10:16,840 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:10:16,879 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-20 21:10:16,881 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2022-11-20 21:10:16,904 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:10:16,935 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-20 21:10:16,936 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-20 21:10:16,988 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:10:16,989 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-20 21:10:17,102 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:10:17,104 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-20 21:10:17,133 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-20 21:10:17,134 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 186 treesize of output 185 [2022-11-20 21:10:17,335 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-20 21:10:17,387 WARN L207 Elim1Store]: Array PQE input equivalent to false [2022-11-20 21:10:17,389 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 21:10:17,466 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [1388271471] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 21:10:17,467 INFO L184 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2022-11-20 21:10:17,467 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [3, 3, 3] total 9 [2022-11-20 21:10:17,468 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [60710013] [2022-11-20 21:10:17,468 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 21:10:17,469 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-20 21:10:17,469 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:10:17,470 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-20 21:10:17,470 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=50, Unknown=0, NotChecked=0, Total=90 [2022-11-20 21:10:17,470 INFO L87 Difference]: Start difference. First operand 23 states and 32 transitions. Second operand has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 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) [2022-11-20 21:10:17,579 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:10:17,579 INFO L93 Difference]: Finished difference Result 51 states and 75 transitions. [2022-11-20 21:10:17,580 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-20 21:10:17,580 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 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 [2022-11-20 21:10:17,580 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:10:17,581 INFO L225 Difference]: With dead ends: 51 [2022-11-20 21:10:17,581 INFO L226 Difference]: Without dead ends: 32 [2022-11-20 21:10:17,582 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=40, Invalid=50, Unknown=0, NotChecked=0, Total=90 [2022-11-20 21:10:17,584 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 37 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 53 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 53 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 21:10:17,587 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [42 Valid, 20 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 53 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-20 21:10:17,590 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2022-11-20 21:10:17,600 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 24. [2022-11-20 21:10:17,601 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 19 states have (on average 1.4210526315789473) internal successors, (27), 19 states have internal predecessors, (27), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-20 21:10:17,602 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 33 transitions. [2022-11-20 21:10:17,603 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 33 transitions. Word has length 11 [2022-11-20 21:10:17,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:10:17,603 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 33 transitions. [2022-11-20 21:10:17,603 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 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) [2022-11-20 21:10:17,603 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 33 transitions. [2022-11-20 21:10:17,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-11-20 21:10:17,604 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:10:17,605 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 21:10:17,615 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2242b7df-701b-4571-83bb-731a9c181ef3/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-20 21:10:17,810 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2242b7df-701b-4571-83bb-731a9c181ef3/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:10:17,811 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:10:17,811 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:10:17,811 INFO L85 PathProgramCache]: Analyzing trace with hash -1850018267, now seen corresponding path program 1 times [2022-11-20 21:10:17,811 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:10:17,812 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [852884944] [2022-11-20 21:10:17,812 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:10:17,812 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:10:17,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:10:17,945 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 21:10:17,946 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:10:17,949 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [852884944] [2022-11-20 21:10:17,949 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [852884944] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 21:10:17,949 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1527842483] [2022-11-20 21:10:17,949 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:10:17,949 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:10:17,950 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2242b7df-701b-4571-83bb-731a9c181ef3/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:10:17,951 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2242b7df-701b-4571-83bb-731a9c181ef3/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 21:10:17,967 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2242b7df-701b-4571-83bb-731a9c181ef3/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-20 21:10:18,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:10:18,021 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-20 21:10:18,023 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 21:10:18,037 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 21:10:18,038 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 21:10:18,055 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 21:10:18,056 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1527842483] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 21:10:18,056 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [970637981] [2022-11-20 21:10:18,058 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-20 21:10:18,058 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 21:10:18,059 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 21:10:18,059 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 21:10:18,059 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 21:10:18,077 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:10:18,093 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-20 21:10:18,093 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2022-11-20 21:10:18,106 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:10:18,129 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-20 21:10:18,129 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-20 21:10:18,160 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:10:18,161 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-20 21:10:18,233 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:10:18,235 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-20 21:10:18,263 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-20 21:10:18,264 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 186 treesize of output 185 [2022-11-20 21:10:18,362 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-20 21:10:18,438 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:10:18,440 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 26 [2022-11-20 21:10:18,497 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 22 for LOIs [2022-11-20 21:10:18,515 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 21:10:18,845 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '413#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (exists ((|v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_1| Int)) (and (= (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_~#a~0#1.base_BEFORE_CALL_1|) 4)) 1 0) |__VERIFIER_assert_#in~cond|) (<= 0 |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_1|))) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-20 21:10:18,845 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 21:10:18,845 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 21:10:18,845 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2022-11-20 21:10:18,846 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [363746308] [2022-11-20 21:10:18,846 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 21:10:18,846 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-20 21:10:18,846 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:10:18,847 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-20 21:10:18,847 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=160, Unknown=0, NotChecked=0, Total=240 [2022-11-20 21:10:18,847 INFO L87 Difference]: Start difference. First operand 24 states and 33 transitions. Second operand has 7 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 6 states have internal predecessors, (16), 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) [2022-11-20 21:10:19,033 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:10:19,033 INFO L93 Difference]: Finished difference Result 75 states and 116 transitions. [2022-11-20 21:10:19,034 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-20 21:10:19,034 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 6 states have internal predecessors, (16), 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 12 [2022-11-20 21:10:19,034 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:10:19,035 INFO L225 Difference]: With dead ends: 75 [2022-11-20 21:10:19,035 INFO L226 Difference]: Without dead ends: 54 [2022-11-20 21:10:19,036 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 78 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=80, Invalid=160, Unknown=0, NotChecked=0, Total=240 [2022-11-20 21:10:19,037 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 87 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 69 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 95 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 96 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 69 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 21:10:19,037 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [95 Valid, 30 Invalid, 96 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 69 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-20 21:10:19,038 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2022-11-20 21:10:19,057 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2022-11-20 21:10:19,057 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 43 states have (on average 1.4651162790697674) internal successors, (63), 43 states have internal predecessors, (63), 9 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-11-20 21:10:19,066 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 81 transitions. [2022-11-20 21:10:19,067 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 81 transitions. Word has length 12 [2022-11-20 21:10:19,067 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:10:19,068 INFO L495 AbstractCegarLoop]: Abstraction has 54 states and 81 transitions. [2022-11-20 21:10:19,073 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 6 states have internal predecessors, (16), 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) [2022-11-20 21:10:19,073 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 81 transitions. [2022-11-20 21:10:19,074 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-11-20 21:10:19,075 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:10:19,075 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 21:10:19,086 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2242b7df-701b-4571-83bb-731a9c181ef3/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-20 21:10:19,281 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2242b7df-701b-4571-83bb-731a9c181ef3/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:10:19,281 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:10:19,281 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:10:19,282 INFO L85 PathProgramCache]: Analyzing trace with hash -395867107, now seen corresponding path program 2 times [2022-11-20 21:10:19,287 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:10:19,287 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [229289812] [2022-11-20 21:10:19,287 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:10:19,288 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:10:19,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:10:19,471 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-20 21:10:19,472 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:10:19,473 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [229289812] [2022-11-20 21:10:19,473 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [229289812] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 21:10:19,473 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [691799409] [2022-11-20 21:10:19,473 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 21:10:19,474 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:10:19,474 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2242b7df-701b-4571-83bb-731a9c181ef3/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:10:19,475 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2242b7df-701b-4571-83bb-731a9c181ef3/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 21:10:19,487 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2242b7df-701b-4571-83bb-731a9c181ef3/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-20 21:10:19,549 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-20 21:10:19,549 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 21:10:19,550 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-20 21:10:19,551 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 21:10:19,573 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-20 21:10:19,573 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 21:10:19,610 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-20 21:10:19,610 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [691799409] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 21:10:19,611 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1842753577] [2022-11-20 21:10:19,613 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-20 21:10:19,613 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 21:10:19,613 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 21:10:19,614 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 21:10:19,614 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 21:10:19,630 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:10:19,655 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-20 21:10:19,656 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-20 21:10:19,668 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:10:19,669 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2022-11-20 21:10:19,691 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:10:19,692 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-20 21:10:19,745 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:10:19,749 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:10:19,767 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-20 21:10:19,768 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 196 treesize of output 184 [2022-11-20 21:10:19,816 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-20 21:10:19,925 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:10:19,927 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 26 [2022-11-20 21:10:19,952 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 22 for LOIs [2022-11-20 21:10:19,975 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 21:10:20,324 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '736#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (exists ((|v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_2| Int)) (and (= |__VERIFIER_assert_#in~cond| (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_~#a~0#1.base_BEFORE_CALL_2|) 4)) 1 0)) (<= 0 |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_2|))) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-20 21:10:20,324 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 21:10:20,325 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 21:10:20,325 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 10 [2022-11-20 21:10:20,325 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [243271513] [2022-11-20 21:10:20,325 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 21:10:20,326 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-11-20 21:10:20,326 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:10:20,326 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-11-20 21:10:20,326 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=263, Unknown=0, NotChecked=0, Total=342 [2022-11-20 21:10:20,327 INFO L87 Difference]: Start difference. First operand 54 states and 81 transitions. Second operand has 10 states, 10 states have (on average 1.8) internal successors, (18), 10 states have internal predecessors, (18), 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) [2022-11-20 21:10:20,562 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:10:20,562 INFO L93 Difference]: Finished difference Result 106 states and 165 transitions. [2022-11-20 21:10:20,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-20 21:10:20,563 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 1.8) internal successors, (18), 10 states have internal predecessors, (18), 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 15 [2022-11-20 21:10:20,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:10:20,564 INFO L225 Difference]: With dead ends: 106 [2022-11-20 21:10:20,564 INFO L226 Difference]: Without dead ends: 61 [2022-11-20 21:10:20,564 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 161 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=133, Invalid=467, Unknown=0, NotChecked=0, Total=600 [2022-11-20 21:10:20,565 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 26 mSDsluCounter, 60 mSDsCounter, 0 mSdLazyCounter, 102 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 77 SdHoareTripleChecker+Invalid, 111 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 102 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 21:10:20,566 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [30 Valid, 77 Invalid, 111 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 102 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-20 21:10:20,567 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2022-11-20 21:10:20,582 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2022-11-20 21:10:20,582 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 50 states have (on average 1.4) internal successors, (70), 50 states have internal predecessors, (70), 9 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-11-20 21:10:20,583 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 88 transitions. [2022-11-20 21:10:20,583 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 88 transitions. Word has length 15 [2022-11-20 21:10:20,583 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:10:20,584 INFO L495 AbstractCegarLoop]: Abstraction has 61 states and 88 transitions. [2022-11-20 21:10:20,584 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 1.8) internal successors, (18), 10 states have internal predecessors, (18), 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) [2022-11-20 21:10:20,584 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 88 transitions. [2022-11-20 21:10:20,584 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-11-20 21:10:20,585 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:10:20,585 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 21:10:20,591 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2242b7df-701b-4571-83bb-731a9c181ef3/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2022-11-20 21:10:20,791 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2242b7df-701b-4571-83bb-731a9c181ef3/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:10:20,791 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:10:20,792 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:10:20,792 INFO L85 PathProgramCache]: Analyzing trace with hash -646194339, now seen corresponding path program 3 times [2022-11-20 21:10:20,792 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:10:20,792 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2135618871] [2022-11-20 21:10:20,792 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:10:20,792 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:10:20,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:10:20,966 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-20 21:10:20,966 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:10:20,969 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2135618871] [2022-11-20 21:10:20,969 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2135618871] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 21:10:20,969 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1225477309] [2022-11-20 21:10:20,969 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-20 21:10:20,969 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:10:20,970 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2242b7df-701b-4571-83bb-731a9c181ef3/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:10:20,971 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2242b7df-701b-4571-83bb-731a9c181ef3/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 21:10:20,991 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2242b7df-701b-4571-83bb-731a9c181ef3/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-20 21:10:21,043 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-20 21:10:21,044 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 21:10:21,045 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 6 conjunts are in the unsatisfiable core [2022-11-20 21:10:21,046 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 21:10:21,065 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-20 21:10:21,065 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 21:10:21,126 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-20 21:10:21,126 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1225477309] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 21:10:21,126 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2011658985] [2022-11-20 21:10:21,130 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-20 21:10:21,130 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 21:10:21,130 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 21:10:21,131 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 21:10:21,131 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 21:10:21,147 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:10:21,164 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-20 21:10:21,164 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-20 21:10:21,176 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:10:21,177 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2022-11-20 21:10:21,201 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:10:21,204 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-20 21:10:21,253 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:10:21,254 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-20 21:10:21,282 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-20 21:10:21,282 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 186 treesize of output 185 [2022-11-20 21:10:21,397 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-20 21:10:21,460 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:10:21,462 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 26 [2022-11-20 21:10:21,483 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 22 for LOIs [2022-11-20 21:10:21,499 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 21:10:21,787 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1162#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (exists ((|v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_3| Int)) (and (= (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_~#a~0#1.base_BEFORE_CALL_3|) 4)) 1 0) |__VERIFIER_assert_#in~cond|) (<= 0 |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_3|))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-20 21:10:21,787 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 21:10:21,787 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 21:10:21,787 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2022-11-20 21:10:21,788 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1598264521] [2022-11-20 21:10:21,788 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 21:10:21,788 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-11-20 21:10:21,788 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:10:21,789 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-11-20 21:10:21,789 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=167, Invalid=295, Unknown=0, NotChecked=0, Total=462 [2022-11-20 21:10:21,789 INFO L87 Difference]: Start difference. First operand 61 states and 88 transitions. Second operand has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 states have internal predecessors, (22), 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) [2022-11-20 21:10:22,108 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:10:22,109 INFO L93 Difference]: Finished difference Result 182 states and 283 transitions. [2022-11-20 21:10:22,109 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-20 21:10:22,109 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 states have internal predecessors, (22), 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 18 [2022-11-20 21:10:22,109 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:10:22,110 INFO L225 Difference]: With dead ends: 182 [2022-11-20 21:10:22,111 INFO L226 Difference]: Without dead ends: 127 [2022-11-20 21:10:22,111 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 186 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=167, Invalid=295, Unknown=0, NotChecked=0, Total=462 [2022-11-20 21:10:22,112 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 232 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 171 mSolverCounterSat, 67 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 252 SdHoareTripleChecker+Valid, 53 SdHoareTripleChecker+Invalid, 238 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 67 IncrementalHoareTripleChecker+Valid, 171 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-20 21:10:22,112 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [252 Valid, 53 Invalid, 238 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [67 Valid, 171 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-20 21:10:22,113 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2022-11-20 21:10:22,140 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 127. [2022-11-20 21:10:22,141 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 104 states have (on average 1.4230769230769231) internal successors, (148), 104 states have internal predecessors, (148), 21 states have call successors, (21), 1 states have call predecessors, (21), 1 states have return successors, (21), 21 states have call predecessors, (21), 21 states have call successors, (21) [2022-11-20 21:10:22,142 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 190 transitions. [2022-11-20 21:10:22,142 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 190 transitions. Word has length 18 [2022-11-20 21:10:22,142 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:10:22,143 INFO L495 AbstractCegarLoop]: Abstraction has 127 states and 190 transitions. [2022-11-20 21:10:22,143 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 states have internal predecessors, (22), 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) [2022-11-20 21:10:22,143 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 190 transitions. [2022-11-20 21:10:22,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-11-20 21:10:22,144 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:10:22,144 INFO L195 NwaCegarLoop]: trace histogram [10, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 21:10:22,156 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2242b7df-701b-4571-83bb-731a9c181ef3/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-20 21:10:22,350 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2242b7df-701b-4571-83bb-731a9c181ef3/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:10:22,350 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:10:22,351 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:10:22,351 INFO L85 PathProgramCache]: Analyzing trace with hash -1887520675, now seen corresponding path program 4 times [2022-11-20 21:10:22,351 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:10:22,351 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1195594520] [2022-11-20 21:10:22,351 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:10:22,351 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:10:22,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:10:22,656 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-20 21:10:22,657 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:10:22,657 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1195594520] [2022-11-20 21:10:22,657 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1195594520] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 21:10:22,657 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [663640986] [2022-11-20 21:10:22,657 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-20 21:10:22,657 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:10:22,658 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2242b7df-701b-4571-83bb-731a9c181ef3/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:10:22,663 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2242b7df-701b-4571-83bb-731a9c181ef3/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 21:10:22,691 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2242b7df-701b-4571-83bb-731a9c181ef3/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-20 21:10:22,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:10:22,803 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-20 21:10:22,805 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 21:10:22,834 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-20 21:10:22,834 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 21:10:23,061 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-20 21:10:23,062 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [663640986] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 21:10:23,062 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1841959876] [2022-11-20 21:10:23,064 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-20 21:10:23,064 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 21:10:23,065 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 21:10:23,065 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 21:10:23,065 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 21:10:23,077 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:10:23,090 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-20 21:10:23,091 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2022-11-20 21:10:23,103 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:10:23,119 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-20 21:10:23,119 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-20 21:10:23,150 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:10:23,151 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-20 21:10:23,197 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:10:23,200 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:10:23,214 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-20 21:10:23,214 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 196 treesize of output 184 [2022-11-20 21:10:23,255 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-20 21:10:23,309 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:10:23,311 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 26 [2022-11-20 21:10:23,328 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 22 for LOIs [2022-11-20 21:10:23,345 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 21:10:23,664 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1884#(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_4| Int)) (and (= |__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_~#a~0#1.base_BEFORE_CALL_4|) 4)) 1 0)) (<= 0 |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_4|))) (= |#NULL.base| 0))' at error location [2022-11-20 21:10:23,664 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 21:10:23,664 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 21:10:23,664 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 24 [2022-11-20 21:10:23,664 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [637086397] [2022-11-20 21:10:23,665 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 21:10:23,665 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-11-20 21:10:23,665 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:10:23,666 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-11-20 21:10:23,666 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=449, Invalid=673, Unknown=0, NotChecked=0, Total=1122 [2022-11-20 21:10:23,666 INFO L87 Difference]: Start difference. First operand 127 states and 190 transitions. Second operand has 25 states, 25 states have (on average 1.36) internal successors, (34), 24 states have internal predecessors, (34), 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) [2022-11-20 21:10:24,467 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:10:24,467 INFO L93 Difference]: Finished difference Result 374 states and 595 transitions. [2022-11-20 21:10:24,468 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-11-20 21:10:24,468 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.36) internal successors, (34), 24 states have internal predecessors, (34), 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 24 [2022-11-20 21:10:24,468 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:10:24,470 INFO L225 Difference]: With dead ends: 374 [2022-11-20 21:10:24,470 INFO L226 Difference]: Without dead ends: 259 [2022-11-20 21:10:24,472 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 402 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=449, Invalid=673, Unknown=0, NotChecked=0, Total=1122 [2022-11-20 21:10:24,473 INFO L413 NwaCegarLoop]: 55 mSDtfsCounter, 590 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 402 mSolverCounterSat, 175 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 634 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 577 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 175 IncrementalHoareTripleChecker+Valid, 402 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-20 21:10:24,473 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [634 Valid, 88 Invalid, 577 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [175 Valid, 402 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-20 21:10:24,474 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 259 states. [2022-11-20 21:10:24,525 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 259 to 259. [2022-11-20 21:10:24,526 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 259 states, 212 states have (on average 1.4339622641509433) internal successors, (304), 212 states have internal predecessors, (304), 45 states have call successors, (45), 1 states have call predecessors, (45), 1 states have return successors, (45), 45 states have call predecessors, (45), 45 states have call successors, (45) [2022-11-20 21:10:24,528 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 259 states to 259 states and 394 transitions. [2022-11-20 21:10:24,528 INFO L78 Accepts]: Start accepts. Automaton has 259 states and 394 transitions. Word has length 24 [2022-11-20 21:10:24,529 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:10:24,529 INFO L495 AbstractCegarLoop]: Abstraction has 259 states and 394 transitions. [2022-11-20 21:10:24,529 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.36) internal successors, (34), 24 states have internal predecessors, (34), 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) [2022-11-20 21:10:24,529 INFO L276 IsEmpty]: Start isEmpty. Operand 259 states and 394 transitions. [2022-11-20 21:10:24,530 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-11-20 21:10:24,530 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:10:24,530 INFO L195 NwaCegarLoop]: trace histogram [22, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 21:10:24,536 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2242b7df-701b-4571-83bb-731a9c181ef3/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-20 21:10:24,736 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2242b7df-701b-4571-83bb-731a9c181ef3/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:10:24,736 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:10:24,737 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:10:24,737 INFO L85 PathProgramCache]: Analyzing trace with hash -590925219, now seen corresponding path program 5 times [2022-11-20 21:10:24,737 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:10:24,737 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1933296080] [2022-11-20 21:10:24,737 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:10:24,737 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:10:24,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:10:25,521 INFO L134 CoverageAnalysis]: Checked inductivity of 263 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-20 21:10:25,523 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:10:25,523 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1933296080] [2022-11-20 21:10:25,524 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1933296080] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 21:10:25,524 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [281502315] [2022-11-20 21:10:25,524 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 21:10:25,524 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:10:25,525 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2242b7df-701b-4571-83bb-731a9c181ef3/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:10:25,526 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2242b7df-701b-4571-83bb-731a9c181ef3/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 21:10:25,548 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2242b7df-701b-4571-83bb-731a9c181ef3/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-20 21:10:25,634 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-20 21:10:25,635 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 21:10:25,636 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 7 conjunts are in the unsatisfiable core [2022-11-20 21:10:25,638 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 21:10:25,801 INFO L134 CoverageAnalysis]: Checked inductivity of 263 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2022-11-20 21:10:25,801 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 21:10:25,966 INFO L134 CoverageAnalysis]: Checked inductivity of 263 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2022-11-20 21:10:25,967 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [281502315] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 21:10:25,967 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [616354705] [2022-11-20 21:10:25,969 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-20 21:10:25,969 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 21:10:25,970 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 21:10:25,970 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 21:10:25,970 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 21:10:25,987 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:10:26,000 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-20 21:10:26,000 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2022-11-20 21:10:26,010 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:10:26,028 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-20 21:10:26,028 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-20 21:10:26,051 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:10:26,052 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-20 21:10:26,103 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:10:26,105 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-20 21:10:26,129 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-20 21:10:26,129 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 186 treesize of output 185 [2022-11-20 21:10:26,231 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-20 21:10:26,298 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:10:26,300 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 26 [2022-11-20 21:10:26,317 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 22 for LOIs [2022-11-20 21:10:26,331 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 21:10:26,752 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3278#(and (exists ((|v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_5| Int)) (and (= |__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_~#a~0#1.base_BEFORE_CALL_5|) 4)) 1 0)) (<= 0 |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_5|))) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-20 21:10:26,752 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 21:10:26,752 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 21:10:26,752 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 8, 8] total 37 [2022-11-20 21:10:26,753 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [155205528] [2022-11-20 21:10:26,753 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 21:10:26,753 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2022-11-20 21:10:26,753 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:10:26,754 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2022-11-20 21:10:26,754 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=575, Invalid=1495, Unknown=0, NotChecked=0, Total=2070 [2022-11-20 21:10:26,755 INFO L87 Difference]: Start difference. First operand 259 states and 394 transitions. Second operand has 37 states, 37 states have (on average 1.2972972972972974) internal successors, (48), 37 states have internal predecessors, (48), 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) [2022-11-20 21:10:33,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:10:33,223 INFO L93 Difference]: Finished difference Result 632 states and 1030 transitions. [2022-11-20 21:10:33,224 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 162 states. [2022-11-20 21:10:33,224 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 1.2972972972972974) internal successors, (48), 37 states have internal predecessors, (48), 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 36 [2022-11-20 21:10:33,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:10:33,228 INFO L225 Difference]: With dead ends: 632 [2022-11-20 21:10:33,229 INFO L226 Difference]: Without dead ends: 397 [2022-11-20 21:10:33,241 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 265 GetRequests, 86 SyntacticMatches, 0 SemanticMatches, 179 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10879 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=9335, Invalid=23245, Unknown=0, NotChecked=0, Total=32580 [2022-11-20 21:10:33,242 INFO L413 NwaCegarLoop]: 61 mSDtfsCounter, 956 mSDsluCounter, 174 mSDsCounter, 0 mSdLazyCounter, 550 mSolverCounterSat, 265 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1004 SdHoareTripleChecker+Valid, 235 SdHoareTripleChecker+Invalid, 815 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 265 IncrementalHoareTripleChecker+Valid, 550 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-20 21:10:33,243 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1004 Valid, 235 Invalid, 815 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [265 Valid, 550 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-20 21:10:33,244 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 397 states. [2022-11-20 21:10:33,325 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 397 to 388. [2022-11-20 21:10:33,326 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 388 states, 337 states have (on average 1.2967359050445104) internal successors, (437), 337 states have internal predecessors, (437), 49 states have call successors, (49), 1 states have call predecessors, (49), 1 states have return successors, (49), 49 states have call predecessors, (49), 49 states have call successors, (49) [2022-11-20 21:10:33,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 388 states to 388 states and 535 transitions. [2022-11-20 21:10:33,329 INFO L78 Accepts]: Start accepts. Automaton has 388 states and 535 transitions. Word has length 36 [2022-11-20 21:10:33,329 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:10:33,329 INFO L495 AbstractCegarLoop]: Abstraction has 388 states and 535 transitions. [2022-11-20 21:10:33,329 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 1.2972972972972974) internal successors, (48), 37 states have internal predecessors, (48), 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) [2022-11-20 21:10:33,330 INFO L276 IsEmpty]: Start isEmpty. Operand 388 states and 535 transitions. [2022-11-20 21:10:33,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-11-20 21:10:33,331 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:10:33,331 INFO L195 NwaCegarLoop]: trace histogram [24, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 21:10:33,344 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2242b7df-701b-4571-83bb-731a9c181ef3/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-20 21:10:33,536 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2242b7df-701b-4571-83bb-731a9c181ef3/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:10:33,537 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:10:33,537 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:10:33,537 INFO L85 PathProgramCache]: Analyzing trace with hash -1336764067, now seen corresponding path program 6 times [2022-11-20 21:10:33,537 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:10:33,538 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [767830677] [2022-11-20 21:10:33,538 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:10:33,538 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:10:33,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:10:34,380 INFO L134 CoverageAnalysis]: Checked inductivity of 355 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-11-20 21:10:34,381 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:10:34,381 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [767830677] [2022-11-20 21:10:34,381 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [767830677] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 21:10:34,381 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [356973751] [2022-11-20 21:10:34,381 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-20 21:10:34,381 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:10:34,382 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2242b7df-701b-4571-83bb-731a9c181ef3/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:10:34,382 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2242b7df-701b-4571-83bb-731a9c181ef3/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 21:10:34,385 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2242b7df-701b-4571-83bb-731a9c181ef3/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-20 21:10:34,507 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-20 21:10:34,507 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 21:10:34,509 INFO L263 TraceCheckSpWp]: Trace formula consists of 325 conjuncts, 26 conjunts are in the unsatisfiable core [2022-11-20 21:10:34,512 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 21:10:34,589 INFO L134 CoverageAnalysis]: Checked inductivity of 355 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-11-20 21:10:34,590 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 21:10:35,504 INFO L134 CoverageAnalysis]: Checked inductivity of 355 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-11-20 21:10:35,504 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [356973751] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 21:10:35,504 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [63512914] [2022-11-20 21:10:35,511 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-20 21:10:35,511 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 21:10:35,511 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 21:10:35,511 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 21:10:35,512 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 21:10:35,528 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:10:35,543 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-20 21:10:35,544 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2022-11-20 21:10:35,555 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:10:35,574 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-20 21:10:35,574 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-20 21:10:35,593 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:10:35,596 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-20 21:10:35,642 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:10:35,643 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-20 21:10:35,667 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-20 21:10:35,667 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 186 treesize of output 185 [2022-11-20 21:10:35,748 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-20 21:10:35,818 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:10:35,819 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 26 [2022-11-20 21:10:35,838 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 22 for LOIs [2022-11-20 21:10:35,853 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 21:10:36,177 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5746#(and (exists ((|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_~#a~0#1.base_BEFORE_CALL_6|) 0) (select (select |#memory_int| |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_6|) 4)) 1 0)) (<= 0 |v_ULTIMATE.start_main_~#a~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 [2022-11-20 21:10:36,178 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 21:10:36,178 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 21:10:36,178 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 52 [2022-11-20 21:10:36,178 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1851831968] [2022-11-20 21:10:36,178 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 21:10:36,179 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2022-11-20 21:10:36,179 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:10:36,180 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2022-11-20 21:10:36,182 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1667, Invalid=2115, Unknown=0, NotChecked=0, Total=3782 [2022-11-20 21:10:36,182 INFO L87 Difference]: Start difference. First operand 388 states and 535 transitions. Second operand has 53 states, 53 states have (on average 1.169811320754717) internal successors, (62), 52 states have internal predecessors, (62), 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) [2022-11-20 21:10:38,417 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:10:38,417 INFO L93 Difference]: Finished difference Result 1036 states and 1537 transitions. [2022-11-20 21:10:38,417 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2022-11-20 21:10:38,417 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 1.169811320754717) internal successors, (62), 52 states have internal predecessors, (62), 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 44 [2022-11-20 21:10:38,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:10:38,421 INFO L225 Difference]: With dead ends: 1036 [2022-11-20 21:10:38,422 INFO L226 Difference]: Without dead ends: 674 [2022-11-20 21:10:38,424 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 96 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 906 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1667, Invalid=2115, Unknown=0, NotChecked=0, Total=3782 [2022-11-20 21:10:38,425 INFO L413 NwaCegarLoop]: 111 mSDtfsCounter, 1563 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 1009 mSolverCounterSat, 483 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1663 SdHoareTripleChecker+Valid, 144 SdHoareTripleChecker+Invalid, 1492 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 483 IncrementalHoareTripleChecker+Valid, 1009 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2022-11-20 21:10:38,426 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1663 Valid, 144 Invalid, 1492 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [483 Valid, 1009 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2022-11-20 21:10:38,427 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 674 states. [2022-11-20 21:10:38,571 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 674 to 674. [2022-11-20 21:10:38,573 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 674 states, 571 states have (on average 1.3572679509632224) internal successors, (775), 571 states have internal predecessors, (775), 101 states have call successors, (101), 1 states have call predecessors, (101), 1 states have return successors, (101), 101 states have call predecessors, (101), 101 states have call successors, (101) [2022-11-20 21:10:38,577 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 674 states to 674 states and 977 transitions. [2022-11-20 21:10:38,578 INFO L78 Accepts]: Start accepts. Automaton has 674 states and 977 transitions. Word has length 44 [2022-11-20 21:10:38,578 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:10:38,578 INFO L495 AbstractCegarLoop]: Abstraction has 674 states and 977 transitions. [2022-11-20 21:10:38,579 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 1.169811320754717) internal successors, (62), 52 states have internal predecessors, (62), 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) [2022-11-20 21:10:38,579 INFO L276 IsEmpty]: Start isEmpty. Operand 674 states and 977 transitions. [2022-11-20 21:10:38,580 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2022-11-20 21:10:38,581 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:10:38,581 INFO L195 NwaCegarLoop]: trace histogram [50, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 21:10:38,587 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2242b7df-701b-4571-83bb-731a9c181ef3/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-20 21:10:38,786 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2242b7df-701b-4571-83bb-731a9c181ef3/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:10:38,787 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:10:38,787 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:10:38,787 INFO L85 PathProgramCache]: Analyzing trace with hash 1333537885, now seen corresponding path program 7 times [2022-11-20 21:10:38,787 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:10:38,787 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [414006822] [2022-11-20 21:10:38,788 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:10:38,788 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:10:38,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:10:41,263 INFO L134 CoverageAnalysis]: Checked inductivity of 1330 backedges. 0 proven. 1275 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-11-20 21:10:41,263 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:10:41,263 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [414006822] [2022-11-20 21:10:41,263 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [414006822] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 21:10:41,263 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2012797023] [2022-11-20 21:10:41,263 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-20 21:10:41,264 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:10:41,264 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2242b7df-701b-4571-83bb-731a9c181ef3/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:10:41,265 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2242b7df-701b-4571-83bb-731a9c181ef3/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 21:10:41,291 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2242b7df-701b-4571-83bb-731a9c181ef3/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-20 21:10:41,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:10:41,466 INFO L263 TraceCheckSpWp]: Trace formula consists of 559 conjuncts, 52 conjunts are in the unsatisfiable core [2022-11-20 21:10:41,470 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 21:10:41,597 INFO L134 CoverageAnalysis]: Checked inductivity of 1330 backedges. 0 proven. 1275 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-11-20 21:10:41,597 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 21:10:45,165 INFO L134 CoverageAnalysis]: Checked inductivity of 1330 backedges. 0 proven. 1275 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-11-20 21:10:45,165 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2012797023] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 21:10:45,166 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [730525295] [2022-11-20 21:10:45,167 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-20 21:10:45,168 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 21:10:45,168 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 21:10:45,168 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 21:10:45,168 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 21:10:45,183 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:10:45,199 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-20 21:10:45,199 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-20 21:10:45,212 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:10:45,213 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2022-11-20 21:10:45,229 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:10:45,230 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-20 21:10:45,289 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:10:45,290 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-20 21:10:45,315 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-20 21:10:45,315 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 186 treesize of output 185 [2022-11-20 21:10:45,378 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-20 21:10:45,430 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:10:45,432 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 26 [2022-11-20 21:10:45,447 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 22 for LOIs [2022-11-20 21:10:45,460 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 21:10:45,861 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9426#(and (exists ((|v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_7| Int)) (and (<= 0 |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_7|) (= |__VERIFIER_assert_#in~cond| (ite (<= (select (select |#memory_int| |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_7|) 0) (select (select |#memory_int| |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_7|) 4)) 1 0)))) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-20 21:10:45,861 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 21:10:45,861 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 21:10:45,861 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52, 52] total 104 [2022-11-20 21:10:45,862 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1271662941] [2022-11-20 21:10:45,862 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 21:10:45,862 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 105 states [2022-11-20 21:10:45,863 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:10:45,865 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 105 interpolants. [2022-11-20 21:10:45,869 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6009, Invalid=6873, Unknown=0, NotChecked=0, Total=12882 [2022-11-20 21:10:45,869 INFO L87 Difference]: Start difference. First operand 674 states and 977 transitions. Second operand has 105 states, 105 states have (on average 1.0857142857142856) internal successors, (114), 104 states have internal predecessors, (114), 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) [2022-11-20 21:10:54,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:10:54,338 INFO L93 Difference]: Finished difference Result 1868 states and 2889 transitions. [2022-11-20 21:10:54,339 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 104 states. [2022-11-20 21:10:54,339 INFO L78 Accepts]: Start accepts. Automaton has has 105 states, 105 states have (on average 1.0857142857142856) internal successors, (114), 104 states have internal predecessors, (114), 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 70 [2022-11-20 21:10:54,340 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:10:54,347 INFO L225 Difference]: With dead ends: 1868 [2022-11-20 21:10:54,347 INFO L226 Difference]: Without dead ends: 1246 [2022-11-20 21:10:54,352 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 260 GetRequests, 148 SyntacticMatches, 0 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1842 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=6009, Invalid=6873, Unknown=0, NotChecked=0, Total=12882 [2022-11-20 21:10:54,353 INFO L413 NwaCegarLoop]: 215 mSDtfsCounter, 3701 mSDsluCounter, 55 mSDsCounter, 0 mSdLazyCounter, 2500 mSolverCounterSat, 1174 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3905 SdHoareTripleChecker+Valid, 270 SdHoareTripleChecker+Invalid, 3674 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1174 IncrementalHoareTripleChecker+Valid, 2500 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.0s IncrementalHoareTripleChecker+Time [2022-11-20 21:10:54,353 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3905 Valid, 270 Invalid, 3674 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1174 Valid, 2500 Invalid, 0 Unknown, 0 Unchecked, 3.0s Time] [2022-11-20 21:10:54,355 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1246 states. [2022-11-20 21:10:54,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1246 to 1246. [2022-11-20 21:10:54,522 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1246 states, 1039 states have (on average 1.3965351299326276) internal successors, (1451), 1039 states have internal predecessors, (1451), 205 states have call successors, (205), 1 states have call predecessors, (205), 1 states have return successors, (205), 205 states have call predecessors, (205), 205 states have call successors, (205) [2022-11-20 21:10:54,529 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1246 states to 1246 states and 1861 transitions. [2022-11-20 21:10:54,530 INFO L78 Accepts]: Start accepts. Automaton has 1246 states and 1861 transitions. Word has length 70 [2022-11-20 21:10:54,530 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:10:54,530 INFO L495 AbstractCegarLoop]: Abstraction has 1246 states and 1861 transitions. [2022-11-20 21:10:54,531 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 105 states, 105 states have (on average 1.0857142857142856) internal successors, (114), 104 states have internal predecessors, (114), 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) [2022-11-20 21:10:54,531 INFO L276 IsEmpty]: Start isEmpty. Operand 1246 states and 1861 transitions. [2022-11-20 21:10:54,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2022-11-20 21:10:54,533 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:10:54,533 INFO L195 NwaCegarLoop]: trace histogram [102, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 21:10:54,540 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2242b7df-701b-4571-83bb-731a9c181ef3/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-20 21:10:54,739 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2242b7df-701b-4571-83bb-731a9c181ef3/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:10:54,740 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:10:54,740 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:10:54,740 INFO L85 PathProgramCache]: Analyzing trace with hash -1432743331, now seen corresponding path program 8 times [2022-11-20 21:10:54,740 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:10:54,740 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [452036859] [2022-11-20 21:10:54,740 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:10:54,741 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:10:54,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:11:02,455 INFO L134 CoverageAnalysis]: Checked inductivity of 5308 backedges. 0 proven. 5253 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-11-20 21:11:02,455 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:11:02,455 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [452036859] [2022-11-20 21:11:02,455 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [452036859] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 21:11:02,455 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [192022865] [2022-11-20 21:11:02,455 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 21:11:02,456 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:11:02,456 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2242b7df-701b-4571-83bb-731a9c181ef3/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:11:02,463 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2242b7df-701b-4571-83bb-731a9c181ef3/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 21:11:02,483 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2242b7df-701b-4571-83bb-731a9c181ef3/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-20 21:11:02,731 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-11-20 21:11:02,732 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 21:11:02,734 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 13 conjunts are in the unsatisfiable core [2022-11-20 21:11:02,738 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 21:11:03,286 INFO L134 CoverageAnalysis]: Checked inductivity of 5308 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 5253 trivial. 0 not checked. [2022-11-20 21:11:03,286 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 21:11:04,016 INFO L134 CoverageAnalysis]: Checked inductivity of 5308 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 5253 trivial. 0 not checked. [2022-11-20 21:11:04,016 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [192022865] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 21:11:04,016 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2145443918] [2022-11-20 21:11:04,018 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-20 21:11:04,018 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 21:11:04,019 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 21:11:04,019 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 21:11:04,019 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 21:11:04,029 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:11:04,041 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-20 21:11:04,041 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2022-11-20 21:11:04,048 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:11:04,062 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-20 21:11:04,062 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-20 21:11:04,083 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:11:04,104 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-20 21:11:04,145 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:11:04,148 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:11:04,161 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-20 21:11:04,163 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 196 treesize of output 184 [2022-11-20 21:11:04,211 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-20 21:11:04,259 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:11:04,262 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 26 [2022-11-20 21:11:04,277 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 22 for LOIs [2022-11-20 21:11:04,292 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 21:11:04,866 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15990#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (exists ((|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_~#a~0#1.base_BEFORE_CALL_8|) 0) (select (select |#memory_int| |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_8|) 4)) 1 0)) (<= 0 |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_8|))) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-20 21:11:04,866 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 21:11:04,866 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 21:11:04,866 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [104, 14, 14] total 129 [2022-11-20 21:11:04,867 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1123470427] [2022-11-20 21:11:04,867 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 21:11:04,867 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 129 states [2022-11-20 21:11:04,867 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:11:04,869 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 129 interpolants. [2022-11-20 21:11:04,872 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6505, Invalid=12401, Unknown=0, NotChecked=0, Total=18906 [2022-11-20 21:11:04,872 INFO L87 Difference]: Start difference. First operand 1246 states and 1861 transitions. Second operand has 129 states, 129 states have (on average 1.0852713178294573) internal successors, (140), 129 states have internal predecessors, (140), 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) [2022-11-20 21:16:14,721 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:16:14,721 INFO L93 Difference]: Finished difference Result 3414 states and 5660 transitions. [2022-11-20 21:16:14,722 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 1317 states. [2022-11-20 21:16:14,722 INFO L78 Accepts]: Start accepts. Automaton has has 129 states, 129 states have (on average 1.0852713178294573) internal successors, (140), 129 states have internal predecessors, (140), 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 122 [2022-11-20 21:16:14,723 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:16:14,736 INFO L225 Difference]: With dead ends: 3414 [2022-11-20 21:16:14,736 INFO L226 Difference]: Without dead ends: 2272 [2022-11-20 21:16:14,887 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1678 GetRequests, 332 SyntacticMatches, 0 SemanticMatches, 1346 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 748824 ImplicationChecksByTransitivity, 258.6s TimeCoverageRelationStatistics Valid=517477, Invalid=1298279, Unknown=0, NotChecked=0, Total=1815756 [2022-11-20 21:16:14,888 INFO L413 NwaCegarLoop]: 221 mSDtfsCounter, 7604 mSDsluCounter, 767 mSDsCounter, 0 mSdLazyCounter, 2519 mSolverCounterSat, 1404 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7812 SdHoareTripleChecker+Valid, 988 SdHoareTripleChecker+Invalid, 3923 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 1404 IncrementalHoareTripleChecker+Valid, 2519 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.0s IncrementalHoareTripleChecker+Time [2022-11-20 21:16:14,888 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7812 Valid, 988 Invalid, 3923 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [1404 Valid, 2519 Invalid, 0 Unknown, 0 Unchecked, 3.0s Time] [2022-11-20 21:16:14,891 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2272 states. [2022-11-20 21:16:15,444 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2272 to 2263. [2022-11-20 21:16:15,449 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2263 states, 2052 states have (on average 1.2046783625730995) internal successors, (2472), 2052 states have internal predecessors, (2472), 209 states have call successors, (209), 1 states have call predecessors, (209), 1 states have return successors, (209), 209 states have call predecessors, (209), 209 states have call successors, (209) [2022-11-20 21:16:15,458 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2263 states to 2263 states and 2890 transitions. [2022-11-20 21:16:15,459 INFO L78 Accepts]: Start accepts. Automaton has 2263 states and 2890 transitions. Word has length 122 [2022-11-20 21:16:15,460 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:16:15,460 INFO L495 AbstractCegarLoop]: Abstraction has 2263 states and 2890 transitions. [2022-11-20 21:16:15,460 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 129 states, 129 states have (on average 1.0852713178294573) internal successors, (140), 129 states have internal predecessors, (140), 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) [2022-11-20 21:16:15,461 INFO L276 IsEmpty]: Start isEmpty. Operand 2263 states and 2890 transitions. [2022-11-20 21:16:15,469 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2022-11-20 21:16:15,469 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:16:15,470 INFO L195 NwaCegarLoop]: trace histogram [104, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 21:16:15,488 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2242b7df-701b-4571-83bb-731a9c181ef3/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-20 21:16:15,689 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2242b7df-701b-4571-83bb-731a9c181ef3/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:16:15,689 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:16:15,690 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:16:15,690 INFO L85 PathProgramCache]: Analyzing trace with hash 646185309, now seen corresponding path program 9 times [2022-11-20 21:16:15,690 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:16:15,690 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1851136952] [2022-11-20 21:16:15,690 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:16:15,691 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:16:15,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:16:24,351 INFO L134 CoverageAnalysis]: Checked inductivity of 5713 backedges. 0 proven. 5460 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2022-11-20 21:16:24,351 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:16:24,351 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1851136952] [2022-11-20 21:16:24,351 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1851136952] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 21:16:24,351 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1434551245] [2022-11-20 21:16:24,351 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-20 21:16:24,351 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:16:24,351 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2242b7df-701b-4571-83bb-731a9c181ef3/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:16:24,353 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2242b7df-701b-4571-83bb-731a9c181ef3/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 21:16:24,355 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2242b7df-701b-4571-83bb-731a9c181ef3/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-20 21:16:24,847 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-20 21:16:24,847 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 21:16:24,854 INFO L263 TraceCheckSpWp]: Trace formula consists of 1093 conjuncts, 106 conjunts are in the unsatisfiable core [2022-11-20 21:16:24,859 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 21:16:25,147 INFO L134 CoverageAnalysis]: Checked inductivity of 5713 backedges. 0 proven. 5460 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2022-11-20 21:16:25,147 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 21:16:39,098 INFO L134 CoverageAnalysis]: Checked inductivity of 5713 backedges. 0 proven. 5460 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2022-11-20 21:16:39,098 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1434551245] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 21:16:39,098 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1620478146] [2022-11-20 21:16:39,101 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-20 21:16:39,101 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 21:16:39,102 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 21:16:39,102 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 21:16:39,102 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 21:16:39,116 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:16:39,128 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-20 21:16:39,129 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2022-11-20 21:16:39,136 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:16:39,151 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-20 21:16:39,152 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-20 21:16:39,178 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:16:39,179 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-20 21:16:39,213 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:16:39,215 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:16:39,228 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-20 21:16:39,228 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 196 treesize of output 184 [2022-11-20 21:16:39,277 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-20 21:16:39,339 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:16:39,340 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 26 [2022-11-20 21:16:39,359 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 22 for LOIs [2022-11-20 21:16:39,372 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 21:16:39,909 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '30154#(and (exists ((|v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_9| Int)) (and (<= 0 |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_9|) (= |__VERIFIER_assert_#in~cond| (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_~#a~0#1.base_BEFORE_CALL_9|) 4)) 1 0)))) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-20 21:16:39,909 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 21:16:39,909 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 21:16:39,909 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [106, 106, 106] total 212 [2022-11-20 21:16:39,909 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1697116562] [2022-11-20 21:16:39,909 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 21:16:39,910 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 213 states [2022-11-20 21:16:39,910 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:16:39,916 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 213 interpolants. [2022-11-20 21:16:39,922 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23667, Invalid=25395, Unknown=0, NotChecked=0, Total=49062 [2022-11-20 21:16:39,923 INFO L87 Difference]: Start difference. First operand 2263 states and 2890 transitions. Second operand has 213 states, 213 states have (on average 1.0422535211267605) internal successors, (222), 212 states have internal predecessors, (222), 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) [2022-11-20 21:17:52,190 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:17:52,191 INFO L93 Difference]: Finished difference Result 5586 states and 7687 transitions. [2022-11-20 21:17:52,191 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 212 states. [2022-11-20 21:17:52,191 INFO L78 Accepts]: Start accepts. Automaton has has 213 states, 213 states have (on average 1.0422535211267605) internal successors, (222), 212 states have internal predecessors, (222), 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 136 [2022-11-20 21:17:52,192 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:17:52,205 INFO L225 Difference]: With dead ends: 5586 [2022-11-20 21:17:52,205 INFO L226 Difference]: Without dead ends: 3429 [2022-11-20 21:17:52,213 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 512 GetRequests, 292 SyntacticMatches, 0 SemanticMatches, 220 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3786 ImplicationChecksByTransitivity, 19.0s TimeCoverageRelationStatistics Valid=23667, Invalid=25395, Unknown=0, NotChecked=0, Total=49062 [2022-11-20 21:17:52,213 INFO L413 NwaCegarLoop]: 431 mSDtfsCounter, 10011 mSDsluCounter, 110 mSDsCounter, 0 mSdLazyCounter, 5086 mSolverCounterSat, 3288 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10431 SdHoareTripleChecker+Valid, 541 SdHoareTripleChecker+Invalid, 8374 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 3288 IncrementalHoareTripleChecker+Valid, 5086 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.1s IncrementalHoareTripleChecker+Time [2022-11-20 21:17:52,214 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10431 Valid, 541 Invalid, 8374 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [3288 Valid, 5086 Invalid, 0 Unknown, 0 Unchecked, 6.1s Time] [2022-11-20 21:17:52,217 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3429 states. [2022-11-20 21:17:52,700 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3429 to 3429. [2022-11-20 21:17:52,708 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3429 states, 3006 states have (on average 1.2807717897538258) internal successors, (3850), 3006 states have internal predecessors, (3850), 421 states have call successors, (421), 1 states have call predecessors, (421), 1 states have return successors, (421), 421 states have call predecessors, (421), 421 states have call successors, (421) [2022-11-20 21:17:52,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3429 states to 3429 states and 4692 transitions. [2022-11-20 21:17:52,721 INFO L78 Accepts]: Start accepts. Automaton has 3429 states and 4692 transitions. Word has length 136 [2022-11-20 21:17:52,722 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:17:52,723 INFO L495 AbstractCegarLoop]: Abstraction has 3429 states and 4692 transitions. [2022-11-20 21:17:52,723 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 213 states, 213 states have (on average 1.0422535211267605) internal successors, (222), 212 states have internal predecessors, (222), 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) [2022-11-20 21:17:52,723 INFO L276 IsEmpty]: Start isEmpty. Operand 3429 states and 4692 transitions. [2022-11-20 21:17:52,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 243 [2022-11-20 21:17:52,727 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:17:52,727 INFO L195 NwaCegarLoop]: trace histogram [210, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 21:17:52,740 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2242b7df-701b-4571-83bb-731a9c181ef3/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-20 21:17:52,934 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2242b7df-701b-4571-83bb-731a9c181ef3/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:17:52,934 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:17:52,935 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:17:52,935 INFO L85 PathProgramCache]: Analyzing trace with hash -206246819, now seen corresponding path program 10 times [2022-11-20 21:17:52,935 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:17:52,935 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1794615238] [2022-11-20 21:17:52,935 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:17:52,935 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:17:53,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:18:19,770 INFO L134 CoverageAnalysis]: Checked inductivity of 22408 backedges. 0 proven. 22155 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2022-11-20 21:18:19,770 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:18:19,770 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1794615238] [2022-11-20 21:18:19,770 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1794615238] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 21:18:19,771 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [194654203] [2022-11-20 21:18:19,771 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-20 21:18:19,771 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:18:19,771 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2242b7df-701b-4571-83bb-731a9c181ef3/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:18:19,773 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2242b7df-701b-4571-83bb-731a9c181ef3/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 21:18:19,775 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2242b7df-701b-4571-83bb-731a9c181ef3/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-20 21:18:20,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:18:20,316 INFO L263 TraceCheckSpWp]: Trace formula consists of 2047 conjuncts, 212 conjunts are in the unsatisfiable core [2022-11-20 21:18:20,324 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 21:18:20,715 INFO L134 CoverageAnalysis]: Checked inductivity of 22408 backedges. 0 proven. 22155 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2022-11-20 21:18:20,716 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 21:19:14,156 INFO L134 CoverageAnalysis]: Checked inductivity of 22408 backedges. 0 proven. 22155 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2022-11-20 21:19:14,156 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [194654203] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 21:19:14,156 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [767816585] [2022-11-20 21:19:14,158 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-20 21:19:14,158 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 21:19:14,158 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 21:19:14,159 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 21:19:14,159 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 21:19:14,174 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:19:14,190 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-20 21:19:14,190 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-20 21:19:14,199 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:19:14,200 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2022-11-20 21:19:14,216 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:19:14,217 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-20 21:19:14,251 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:19:14,253 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:19:14,265 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-20 21:19:14,265 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 196 treesize of output 184 [2022-11-20 21:19:14,296 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-20 21:19:14,339 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:19:14,341 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 26 [2022-11-20 21:19:14,355 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 22 for LOIs [2022-11-20 21:19:14,369 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 21:19:15,141 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '48996#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (exists ((|v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_10| Int)) (and (= |__VERIFIER_assert_#in~cond| (ite (<= (select (select |#memory_int| |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_10|) 0) (select (select |#memory_int| |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_10|) 4)) 1 0)) (<= 0 |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_10|))) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-20 21:19:15,141 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 21:19:15,141 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 21:19:15,141 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [212, 212, 212] total 424 [2022-11-20 21:19:15,142 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [524388823] [2022-11-20 21:19:15,142 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 21:19:15,143 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 425 states [2022-11-20 21:19:15,143 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:19:15,161 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 425 interpolants. [2022-11-20 21:19:15,172 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=92249, Invalid=95673, Unknown=0, NotChecked=0, Total=187922 [2022-11-20 21:19:15,173 INFO L87 Difference]: Start difference. First operand 3429 states and 4692 transitions. Second operand has 425 states, 425 states have (on average 1.0211764705882354) internal successors, (434), 424 states have internal predecessors, (434), 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)