./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-examples/data_structures_set_multi_proc_ground-1.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version b5237d83 Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-examples/data_structures_set_multi_proc_ground-1.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba --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 4c9c46abbea18888bba6501dfe6c704a11e8fe399c985999e1e07c66bb12b728 --- 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-b5237d8 [2022-11-22 01:25:51,549 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-22 01:25:51,551 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-22 01:25:51,571 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-22 01:25:51,571 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-22 01:25:51,572 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-22 01:25:51,574 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-22 01:25:51,575 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-22 01:25:51,577 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-22 01:25:51,578 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-22 01:25:51,579 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-22 01:25:51,580 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-22 01:25:51,580 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-22 01:25:51,581 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-22 01:25:51,583 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-22 01:25:51,584 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-22 01:25:51,585 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-22 01:25:51,585 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-22 01:25:51,587 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-22 01:25:51,589 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-22 01:25:51,590 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-22 01:25:51,594 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-22 01:25:51,595 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-22 01:25:51,596 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-22 01:25:51,599 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-22 01:25:51,600 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-22 01:25:51,600 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-22 01:25:51,601 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-22 01:25:51,602 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-22 01:25:51,603 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-22 01:25:51,603 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-22 01:25:51,604 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-22 01:25:51,605 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-22 01:25:51,605 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-22 01:25:51,606 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-22 01:25:51,607 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-22 01:25:51,616 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-22 01:25:51,617 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-22 01:25:51,617 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-22 01:25:51,618 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-22 01:25:51,620 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-22 01:25:51,622 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-22 01:25:51,658 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-22 01:25:51,658 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-22 01:25:51,659 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-22 01:25:51,659 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-22 01:25:51,660 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-22 01:25:51,660 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-22 01:25:51,660 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-22 01:25:51,661 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-22 01:25:51,661 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-22 01:25:51,661 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-22 01:25:51,662 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-22 01:25:51,662 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-22 01:25:51,662 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-22 01:25:51,662 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-22 01:25:51,663 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-22 01:25:51,663 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-22 01:25:51,663 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-22 01:25:51,663 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-22 01:25:51,664 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-22 01:25:51,664 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-22 01:25:51,664 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-22 01:25:51,664 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-22 01:25:51,664 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-22 01:25:51,665 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-22 01:25:51,665 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-22 01:25:51,665 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-22 01:25:51,665 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-22 01:25:51,665 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-22 01:25:51,665 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-22 01:25:51,666 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-22 01:25:51,666 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-22 01:25:51,666 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-22 01:25:51,666 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-22 01:25:51,667 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-22 01:25:51,667 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-22 01:25:51,667 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-22 01:25:51,667 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-22 01:25:51,667 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-22 01:25:51,667 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-22 01:25:51,668 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-22 01:25:51,668 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-22 01:25:51,668 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_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 4c9c46abbea18888bba6501dfe6c704a11e8fe399c985999e1e07c66bb12b728 [2022-11-22 01:25:51,977 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-22 01:25:52,012 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-22 01:25:52,015 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-22 01:25:52,017 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-22 01:25:52,017 INFO L275 PluginConnector]: CDTParser initialized [2022-11-22 01:25:52,019 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/../../sv-benchmarks/c/array-examples/data_structures_set_multi_proc_ground-1.i [2022-11-22 01:25:55,167 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-22 01:25:55,388 INFO L351 CDTParser]: Found 1 translation units. [2022-11-22 01:25:55,389 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/sv-benchmarks/c/array-examples/data_structures_set_multi_proc_ground-1.i [2022-11-22 01:25:55,396 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/data/3cf37a4ed/6e5dda857eb84be8829c943dcc6195df/FLAGf1db481dc [2022-11-22 01:25:55,413 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/data/3cf37a4ed/6e5dda857eb84be8829c943dcc6195df [2022-11-22 01:25:55,419 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-22 01:25:55,420 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-22 01:25:55,426 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-22 01:25:55,427 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-22 01:25:55,431 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-22 01:25:55,432 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 01:25:55" (1/1) ... [2022-11-22 01:25:55,433 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@16c071a4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:25:55, skipping insertion in model container [2022-11-22 01:25:55,434 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 01:25:55" (1/1) ... [2022-11-22 01:25:55,442 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-22 01:25:55,468 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-22 01:25:55,620 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_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/sv-benchmarks/c/array-examples/data_structures_set_multi_proc_ground-1.i[832,845] [2022-11-22 01:25:55,642 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-22 01:25:55,649 INFO L203 MainTranslator]: Completed pre-run [2022-11-22 01:25:55,660 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_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/sv-benchmarks/c/array-examples/data_structures_set_multi_proc_ground-1.i[832,845] [2022-11-22 01:25:55,672 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-22 01:25:55,686 INFO L208 MainTranslator]: Completed translation [2022-11-22 01:25:55,686 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:25:55 WrapperNode [2022-11-22 01:25:55,686 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-22 01:25:55,687 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-22 01:25:55,688 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-22 01:25:55,688 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-22 01:25:55,695 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:25:55" (1/1) ... [2022-11-22 01:25:55,702 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:25:55" (1/1) ... [2022-11-22 01:25:55,725 INFO L138 Inliner]: procedures = 18, calls = 26, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 137 [2022-11-22 01:25:55,726 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-22 01:25:55,726 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-22 01:25:55,727 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-22 01:25:55,727 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-22 01:25:55,736 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:25:55" (1/1) ... [2022-11-22 01:25:55,736 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:25:55" (1/1) ... [2022-11-22 01:25:55,739 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:25:55" (1/1) ... [2022-11-22 01:25:55,739 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:25:55" (1/1) ... [2022-11-22 01:25:55,746 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:25:55" (1/1) ... [2022-11-22 01:25:55,760 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:25:55" (1/1) ... [2022-11-22 01:25:55,762 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:25:55" (1/1) ... [2022-11-22 01:25:55,763 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:25:55" (1/1) ... [2022-11-22 01:25:55,766 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-22 01:25:55,767 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-22 01:25:55,767 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-22 01:25:55,767 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-22 01:25:55,768 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:25:55" (1/1) ... [2022-11-22 01:25:55,773 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-22 01:25:55,786 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:25:55,798 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-22 01:25:55,819 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-22 01:25:55,867 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-22 01:25:55,867 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-22 01:25:55,867 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-11-22 01:25:55,867 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-11-22 01:25:55,867 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-22 01:25:55,868 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-22 01:25:55,868 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-11-22 01:25:55,868 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-11-22 01:25:55,868 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-11-22 01:25:55,868 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-11-22 01:25:55,997 INFO L235 CfgBuilder]: Building ICFG [2022-11-22 01:25:55,999 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-22 01:25:56,271 INFO L276 CfgBuilder]: Performing block encoding [2022-11-22 01:25:56,439 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-22 01:25:56,439 INFO L300 CfgBuilder]: Removed 8 assume(true) statements. [2022-11-22 01:25:56,442 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 01:25:56 BoogieIcfgContainer [2022-11-22 01:25:56,455 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-22 01:25:56,458 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-22 01:25:56,458 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-22 01:25:56,462 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-22 01:25:56,462 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.11 01:25:55" (1/3) ... [2022-11-22 01:25:56,463 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@36e449e4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 01:25:56, skipping insertion in model container [2022-11-22 01:25:56,463 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:25:55" (2/3) ... [2022-11-22 01:25:56,464 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@36e449e4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 01:25:56, skipping insertion in model container [2022-11-22 01:25:56,464 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 01:25:56" (3/3) ... [2022-11-22 01:25:56,465 INFO L112 eAbstractionObserver]: Analyzing ICFG data_structures_set_multi_proc_ground-1.i [2022-11-22 01:25:56,487 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-22 01:25:56,487 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-22 01:25:56,561 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-22 01:25:56,571 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;@254feb1a, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-22 01:25:56,571 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-22 01:25:56,575 INFO L276 IsEmpty]: Start isEmpty. Operand has 22 states, 17 states have (on average 1.6470588235294117) internal successors, (28), 18 states have internal predecessors, (28), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-22 01:25:56,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-11-22 01:25:56,583 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:25:56,583 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:25:56,584 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:25:56,591 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:25:56,591 INFO L85 PathProgramCache]: Analyzing trace with hash 825226196, now seen corresponding path program 1 times [2022-11-22 01:25:56,604 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:25:56,605 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [878670983] [2022-11-22 01:25:56,605 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:25:56,606 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:25:56,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:25:56,938 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:25:56,939 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:25:56,939 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [878670983] [2022-11-22 01:25:56,940 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [878670983] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 01:25:56,940 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 01:25:56,941 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-22 01:25:56,943 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1419928601] [2022-11-22 01:25:56,944 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 01:25:56,950 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-22 01:25:56,950 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:25:56,987 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-22 01:25:56,988 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-22 01:25:56,991 INFO L87 Difference]: Start difference. First operand has 22 states, 17 states have (on average 1.6470588235294117) internal successors, (28), 18 states have internal predecessors, (28), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 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) [2022-11-22 01:25:57,122 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:25:57,122 INFO L93 Difference]: Finished difference Result 57 states and 90 transitions. [2022-11-22 01:25:57,124 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-22 01:25:57,126 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 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 8 [2022-11-22 01:25:57,126 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:25:57,136 INFO L225 Difference]: With dead ends: 57 [2022-11-22 01:25:57,137 INFO L226 Difference]: Without dead ends: 35 [2022-11-22 01:25:57,141 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 [2022-11-22 01:25:57,145 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 16 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 39 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:25:57,147 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 26 Invalid, 39 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:25:57,170 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2022-11-22 01:25:57,191 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 22. [2022-11-22 01:25:57,193 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 18 states have (on average 1.5) internal successors, (27), 18 states have internal predecessors, (27), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-22 01:25:57,195 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 31 transitions. [2022-11-22 01:25:57,196 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 31 transitions. Word has length 8 [2022-11-22 01:25:57,197 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:25:57,197 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 31 transitions. [2022-11-22 01:25:57,197 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 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) [2022-11-22 01:25:57,198 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 31 transitions. [2022-11-22 01:25:57,198 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-22 01:25:57,199 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:25:57,199 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:25:57,199 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-22 01:25:57,200 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:25:57,200 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:25:57,201 INFO L85 PathProgramCache]: Analyzing trace with hash -224566578, now seen corresponding path program 1 times [2022-11-22 01:25:57,201 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:25:57,201 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [929410922] [2022-11-22 01:25:57,202 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:25:57,202 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:25:57,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:25:57,362 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:25:57,363 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:25:57,363 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [929410922] [2022-11-22 01:25:57,364 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [929410922] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:25:57,364 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1323996757] [2022-11-22 01:25:57,364 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:25:57,365 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:25:57,365 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:25:57,375 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:25:57,406 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-22 01:25:57,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:25:57,483 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-22 01:25:57,489 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:25:57,542 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:25:57,543 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:25:57,570 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:25:57,571 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1323996757] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:25:57,571 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1486363818] [2022-11-22 01:25:57,625 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-11-22 01:25:57,625 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:25:57,630 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:25:57,638 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:25:57,648 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:25:57,806 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:25:57,864 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-22 01:25:57,865 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 [2022-11-22 01:25:57,895 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:25:57,922 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-22 01:25:57,923 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 [2022-11-22 01:25:58,002 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:25:58,009 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 [2022-11-22 01:25:58,219 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:25:58,224 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:25:58,244 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-22 01:25:58,245 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 202 treesize of output 190 [2022-11-22 01:25:58,383 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-22 01:25:58,407 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:25:58,481 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [1486363818] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 01:25:58,481 INFO L184 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:25:58,481 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3, 3, 3] total 8 [2022-11-22 01:25:58,484 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1962628678] [2022-11-22 01:25:58,484 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 01:25:58,485 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-22 01:25:58,486 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:25:58,487 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-22 01:25:58,489 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=41, Unknown=0, NotChecked=0, Total=72 [2022-11-22 01:25:58,490 INFO L87 Difference]: Start difference. First operand 22 states and 31 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 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) [2022-11-22 01:25:58,592 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:25:58,593 INFO L93 Difference]: Finished difference Result 43 states and 61 transitions. [2022-11-22 01:25:58,593 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-22 01:25:58,593 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 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 [2022-11-22 01:25:58,594 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:25:58,595 INFO L225 Difference]: With dead ends: 43 [2022-11-22 01:25:58,595 INFO L226 Difference]: Without dead ends: 23 [2022-11-22 01:25:58,595 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=41, Unknown=0, NotChecked=0, Total=72 [2022-11-22 01:25:58,600 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 8 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:25:58,607 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 29 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:25:58,610 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2022-11-22 01:25:58,616 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 20. [2022-11-22 01:25:58,616 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 17 states have (on average 1.411764705882353) internal successors, (24), 17 states have internal predecessors, (24), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-22 01:25:58,617 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 26 transitions. [2022-11-22 01:25:58,617 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 26 transitions. Word has length 9 [2022-11-22 01:25:58,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:25:58,618 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 26 transitions. [2022-11-22 01:25:58,618 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 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) [2022-11-22 01:25:58,618 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 26 transitions. [2022-11-22 01:25:58,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-11-22 01:25:58,619 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:25:58,619 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:25:58,633 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-22 01:25:58,827 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:25:58,828 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:25:58,828 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:25:58,828 INFO L85 PathProgramCache]: Analyzing trace with hash -747487474, now seen corresponding path program 1 times [2022-11-22 01:25:58,828 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:25:58,829 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1431930001] [2022-11-22 01:25:58,829 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:25:58,829 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:25:58,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:25:58,947 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-22 01:25:58,947 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:25:58,947 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1431930001] [2022-11-22 01:25:58,948 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1431930001] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:25:58,948 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [596954440] [2022-11-22 01:25:58,948 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:25:58,948 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:25:58,948 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:25:58,950 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:25:58,975 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-22 01:25:59,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:25:59,053 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-22 01:25:59,055 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:25:59,065 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-22 01:25:59,065 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-22 01:25:59,065 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [596954440] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 01:25:59,065 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-22 01:25:59,066 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3] total 5 [2022-11-22 01:25:59,066 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [938069830] [2022-11-22 01:25:59,066 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 01:25:59,067 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-22 01:25:59,067 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:25:59,068 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-22 01:25:59,068 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-22 01:25:59,068 INFO L87 Difference]: Start difference. First operand 20 states and 26 transitions. Second operand has 3 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 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) [2022-11-22 01:25:59,111 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:25:59,111 INFO L93 Difference]: Finished difference Result 39 states and 52 transitions. [2022-11-22 01:25:59,112 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-22 01:25:59,112 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 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 [2022-11-22 01:25:59,113 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:25:59,113 INFO L225 Difference]: With dead ends: 39 [2022-11-22 01:25:59,113 INFO L226 Difference]: Without dead ends: 24 [2022-11-22 01:25:59,114 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-22 01:25:59,115 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 5 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-22 01:25:59,116 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 22 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-22 01:25:59,117 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2022-11-22 01:25:59,121 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 21. [2022-11-22 01:25:59,122 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 18 states have (on average 1.3888888888888888) internal successors, (25), 18 states have internal predecessors, (25), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-22 01:25:59,123 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 27 transitions. [2022-11-22 01:25:59,123 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 27 transitions. Word has length 15 [2022-11-22 01:25:59,123 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:25:59,123 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 27 transitions. [2022-11-22 01:25:59,124 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 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) [2022-11-22 01:25:59,124 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 27 transitions. [2022-11-22 01:25:59,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-11-22 01:25:59,125 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:25:59,125 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:25:59,138 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-22 01:25:59,332 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:25:59,332 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:25:59,333 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:25:59,333 INFO L85 PathProgramCache]: Analyzing trace with hash 1790313624, now seen corresponding path program 1 times [2022-11-22 01:25:59,333 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:25:59,334 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1233898422] [2022-11-22 01:25:59,334 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:25:59,334 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:25:59,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:25:59,448 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-22 01:25:59,449 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:25:59,449 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1233898422] [2022-11-22 01:25:59,450 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1233898422] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:25:59,450 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1365896232] [2022-11-22 01:25:59,452 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:25:59,452 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:25:59,453 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:25:59,456 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:25:59,487 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-22 01:25:59,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:25:59,559 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-22 01:25:59,561 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:25:59,575 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-22 01:25:59,575 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:25:59,595 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-22 01:25:59,596 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1365896232] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:25:59,596 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [370392667] [2022-11-22 01:25:59,599 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-22 01:25:59,599 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:25:59,600 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:25:59,600 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:25:59,600 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:25:59,623 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:25:59,645 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-22 01:25:59,645 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 [2022-11-22 01:25:59,659 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:25:59,661 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 [2022-11-22 01:25:59,691 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:25:59,693 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 [2022-11-22 01:25:59,785 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:25:59,787 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 01:25:59,835 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-22 01:25:59,836 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 192 treesize of output 191 [2022-11-22 01:25:59,967 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 [2022-11-22 01:25:59,997 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-22 01:26:00,005 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 9 [2022-11-22 01:26:00,025 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-22 01:26:00,094 INFO L321 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2022-11-22 01:26:00,095 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 118 treesize of output 119 [2022-11-22 01:26:00,182 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 [2022-11-22 01:26:00,238 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 01:26:00,251 INFO L321 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2022-11-22 01:26:00,252 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 40 treesize of output 30 [2022-11-22 01:26:00,574 INFO L321 Elim1Store]: treesize reduction 143, result has 33.8 percent of original size [2022-11-22 01:26:00,575 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 208 treesize of output 232 [2022-11-22 01:26:01,140 INFO L321 Elim1Store]: treesize reduction 143, result has 33.8 percent of original size [2022-11-22 01:26:01,141 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 208 treesize of output 232 [2022-11-22 01:26:01,512 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:26:02,332 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [370392667] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 01:26:02,332 INFO L184 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:26:02,333 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [3, 3, 3] total 12 [2022-11-22 01:26:02,333 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1364384191] [2022-11-22 01:26:02,333 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 01:26:02,333 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-22 01:26:02,334 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:26:02,334 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-22 01:26:02,334 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=89, Unknown=0, NotChecked=0, Total=156 [2022-11-22 01:26:02,335 INFO L87 Difference]: Start difference. First operand 21 states and 27 transitions. Second operand has 8 states, 8 states have (on average 1.875) internal successors, (15), 7 states have internal predecessors, (15), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:26:02,679 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:26:02,679 INFO L93 Difference]: Finished difference Result 44 states and 60 transitions. [2022-11-22 01:26:02,680 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-11-22 01:26:02,680 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.875) internal successors, (15), 7 states have internal predecessors, (15), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2022-11-22 01:26:02,680 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:26:02,681 INFO L225 Difference]: With dead ends: 44 [2022-11-22 01:26:02,681 INFO L226 Difference]: Without dead ends: 30 [2022-11-22 01:26:02,681 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 63 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2022-11-22 01:26:02,683 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 19 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 71 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 78 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 71 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:26:02,683 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 39 Invalid, 78 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 71 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:26:02,684 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2022-11-22 01:26:02,691 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 25. [2022-11-22 01:26:02,692 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 22 states have (on average 1.3636363636363635) internal successors, (30), 22 states have internal predecessors, (30), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-22 01:26:02,692 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 32 transitions. [2022-11-22 01:26:02,693 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 32 transitions. Word has length 16 [2022-11-22 01:26:02,693 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:26:02,693 INFO L495 AbstractCegarLoop]: Abstraction has 25 states and 32 transitions. [2022-11-22 01:26:02,693 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.875) internal successors, (15), 7 states have internal predecessors, (15), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:26:02,694 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 32 transitions. [2022-11-22 01:26:02,694 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-11-22 01:26:02,694 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:26:02,694 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:26:02,715 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-22 01:26:02,907 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:26:02,908 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:26:02,908 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:26:02,908 INFO L85 PathProgramCache]: Analyzing trace with hash 457595505, now seen corresponding path program 1 times [2022-11-22 01:26:02,908 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:26:02,909 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1678689672] [2022-11-22 01:26:02,909 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:26:02,909 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:26:02,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:26:03,035 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-22 01:26:03,035 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:26:03,035 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1678689672] [2022-11-22 01:26:03,035 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1678689672] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:26:03,035 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [743181585] [2022-11-22 01:26:03,035 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:26:03,036 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:26:03,036 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:26:03,037 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:26:03,070 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-22 01:26:03,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:26:03,133 INFO L263 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-22 01:26:03,135 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:26:03,144 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-22 01:26:03,144 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:26:03,158 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-22 01:26:03,158 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [743181585] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:26:03,159 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [986723647] [2022-11-22 01:26:03,161 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-11-22 01:26:03,161 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:26:03,162 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:26:03,162 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:26:03,162 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:26:03,178 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:26:03,194 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-22 01:26:03,195 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 [2022-11-22 01:26:03,205 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:26:03,206 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 [2022-11-22 01:26:03,223 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:26:03,224 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 [2022-11-22 01:26:03,270 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:26:03,271 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 01:26:03,295 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-22 01:26:03,296 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 192 treesize of output 191 [2022-11-22 01:26:03,365 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 [2022-11-22 01:26:03,379 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-22 01:26:03,386 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 9 [2022-11-22 01:26:03,404 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 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 [2022-11-22 01:26:03,458 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 128 treesize of output 118 [2022-11-22 01:26:03,498 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 [2022-11-22 01:26:03,639 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 01:26:03,640 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 01:26:03,664 INFO L321 Elim1Store]: treesize reduction 52, result has 28.8 percent of original size [2022-11-22 01:26:03,664 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 168 treesize of output 149 [2022-11-22 01:26:04,273 INFO L321 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2022-11-22 01:26:04,274 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2022-11-22 01:26:04,472 INFO L321 Elim1Store]: treesize reduction 75, result has 44.9 percent of original size [2022-11-22 01:26:04,473 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 169 treesize of output 208 [2022-11-22 01:26:05,153 INFO L321 Elim1Store]: treesize reduction 75, result has 44.9 percent of original size [2022-11-22 01:26:05,154 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 169 treesize of output 208 [2022-11-22 01:26:05,465 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2022-11-22 01:26:05,483 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:26:06,482 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '796#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (exists ((|v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_1| Int)) (and (<= 0 |v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_1|) (= (ite (not (= (select (select |#memory_int| |v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_1|) 0) (select (select |#memory_int| |v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_1|) 4))) 1 0) |__VERIFIER_assert_#in~cond|))) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:26:06,482 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:26:06,483 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:26:06,483 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2022-11-22 01:26:06,483 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [815007348] [2022-11-22 01:26:06,483 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:26:06,483 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-22 01:26:06,484 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:26:06,484 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-22 01:26:06,484 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=273, Unknown=0, NotChecked=0, Total=380 [2022-11-22 01:26:06,484 INFO L87 Difference]: Start difference. First operand 25 states and 32 transitions. Second operand has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 6 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) [2022-11-22 01:26:06,559 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:26:06,559 INFO L93 Difference]: Finished difference Result 66 states and 90 transitions. [2022-11-22 01:26:06,560 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-22 01:26:06,560 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 6 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 20 [2022-11-22 01:26:06,560 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:26:06,561 INFO L225 Difference]: With dead ends: 66 [2022-11-22 01:26:06,561 INFO L226 Difference]: Without dead ends: 44 [2022-11-22 01:26:06,561 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 146 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=107, Invalid=273, Unknown=0, NotChecked=0, Total=380 [2022-11-22 01:26:06,562 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 48 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 54 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:26:06,563 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [52 Valid, 28 Invalid, 54 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:26:06,563 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-11-22 01:26:06,570 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 28. [2022-11-22 01:26:06,570 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 25 states have (on average 1.32) internal successors, (33), 25 states have internal predecessors, (33), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-22 01:26:06,571 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 35 transitions. [2022-11-22 01:26:06,571 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 35 transitions. Word has length 20 [2022-11-22 01:26:06,571 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:26:06,571 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 35 transitions. [2022-11-22 01:26:06,571 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 6 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) [2022-11-22 01:26:06,572 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 35 transitions. [2022-11-22 01:26:06,572 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-11-22 01:26:06,572 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:26:06,572 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:26:06,582 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-22 01:26:06,773 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:26:06,773 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:26:06,773 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:26:06,773 INFO L85 PathProgramCache]: Analyzing trace with hash 930745131, now seen corresponding path program 2 times [2022-11-22 01:26:06,774 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:26:06,774 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [231807008] [2022-11-22 01:26:06,774 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:26:06,774 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:26:06,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:26:06,848 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-22 01:26:06,848 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:26:06,848 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [231807008] [2022-11-22 01:26:06,848 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [231807008] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:26:06,848 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1510856452] [2022-11-22 01:26:06,848 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 01:26:06,848 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:26:06,849 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:26:06,850 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:26:06,863 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-22 01:26:06,928 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-22 01:26:06,928 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:26:06,929 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-22 01:26:06,930 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:26:06,946 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-22 01:26:06,947 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:26:06,960 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-22 01:26:06,961 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1510856452] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:26:06,961 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1891642729] [2022-11-22 01:26:06,965 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-11-22 01:26:06,965 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:26:06,965 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:26:06,966 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:26:06,966 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:26:06,982 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:26:06,997 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-22 01:26:06,998 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 [2022-11-22 01:26:07,006 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:26:07,007 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 [2022-11-22 01:26:07,034 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:26:07,035 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 [2022-11-22 01:26:07,076 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:26:07,079 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:26:07,092 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-22 01:26:07,092 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 202 treesize of output 190 [2022-11-22 01:26:07,132 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 [2022-11-22 01:26:07,145 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 9 [2022-11-22 01:26:07,151 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-22 01:26:07,174 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 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 [2022-11-22 01:26:07,212 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 128 treesize of output 118 [2022-11-22 01:26:07,252 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 [2022-11-22 01:26:07,411 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 01:26:07,412 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 01:26:07,435 INFO L321 Elim1Store]: treesize reduction 52, result has 28.8 percent of original size [2022-11-22 01:26:07,436 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 168 treesize of output 149 [2022-11-22 01:26:07,961 INFO L321 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2022-11-22 01:26:07,963 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2022-11-22 01:26:08,200 INFO L321 Elim1Store]: treesize reduction 75, result has 44.9 percent of original size [2022-11-22 01:26:08,201 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 169 treesize of output 208 [2022-11-22 01:26:08,797 INFO L321 Elim1Store]: treesize reduction 75, result has 44.9 percent of original size [2022-11-22 01:26:08,797 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 169 treesize of output 208 [2022-11-22 01:26:09,302 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2022-11-22 01:26:09,315 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:26:10,267 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1109#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (exists ((|v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_2| Int)) (and (<= 0 |v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_2|) (= |__VERIFIER_assert_#in~cond| (ite (not (= (select (select |#memory_int| |v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_2|) 0) (select (select |#memory_int| |v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_2|) 4))) 1 0)))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:26:10,267 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:26:10,267 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:26:10,267 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2022-11-22 01:26:10,267 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1442214892] [2022-11-22 01:26:10,267 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:26:10,268 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-22 01:26:10,268 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:26:10,268 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-22 01:26:10,268 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=318, Unknown=0, NotChecked=0, Total=380 [2022-11-22 01:26:10,269 INFO L87 Difference]: Start difference. First operand 28 states and 35 transitions. Second operand has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 7 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) [2022-11-22 01:26:10,345 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:26:10,345 INFO L93 Difference]: Finished difference Result 66 states and 89 transitions. [2022-11-22 01:26:10,345 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-22 01:26:10,346 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 7 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 23 [2022-11-22 01:26:10,346 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:26:10,346 INFO L225 Difference]: With dead ends: 66 [2022-11-22 01:26:10,346 INFO L226 Difference]: Without dead ends: 47 [2022-11-22 01:26:10,347 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 124 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=62, Invalid=318, Unknown=0, NotChecked=0, Total=380 [2022-11-22 01:26:10,348 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 22 mSDsluCounter, 35 mSDsCounter, 0 mSdLazyCounter, 53 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 64 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 53 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:26:10,348 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [22 Valid, 46 Invalid, 64 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 53 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:26:10,349 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2022-11-22 01:26:10,357 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 45. [2022-11-22 01:26:10,357 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 42 states have (on average 1.3333333333333333) internal successors, (56), 42 states have internal predecessors, (56), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-22 01:26:10,358 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 58 transitions. [2022-11-22 01:26:10,358 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 58 transitions. Word has length 23 [2022-11-22 01:26:10,358 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:26:10,358 INFO L495 AbstractCegarLoop]: Abstraction has 45 states and 58 transitions. [2022-11-22 01:26:10,358 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 7 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) [2022-11-22 01:26:10,359 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 58 transitions. [2022-11-22 01:26:10,359 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-11-22 01:26:10,359 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:26:10,359 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:26:10,364 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-22 01:26:10,563 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:26:10,563 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:26:10,564 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:26:10,564 INFO L85 PathProgramCache]: Analyzing trace with hash 1985012685, now seen corresponding path program 3 times [2022-11-22 01:26:10,564 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:26:10,564 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1457354523] [2022-11-22 01:26:10,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:26:10,565 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:26:10,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:26:10,805 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2022-11-22 01:26:10,805 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:26:10,805 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1457354523] [2022-11-22 01:26:10,805 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1457354523] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:26:10,806 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [917329050] [2022-11-22 01:26:10,806 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 01:26:10,806 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:26:10,806 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:26:10,807 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:26:10,831 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-22 01:26:10,932 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 01:26:10,933 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:26:10,934 INFO L263 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 6 conjunts are in the unsatisfiable core [2022-11-22 01:26:10,937 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:26:10,955 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2022-11-22 01:26:10,955 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:26:11,007 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2022-11-22 01:26:11,007 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [917329050] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:26:11,008 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [778769547] [2022-11-22 01:26:11,012 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-11-22 01:26:11,013 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:26:11,013 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:26:11,013 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:26:11,013 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:26:11,029 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:26:11,041 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-22 01:26:11,042 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 [2022-11-22 01:26:11,053 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:26:11,068 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-22 01:26:11,069 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 [2022-11-22 01:26:11,084 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:26:11,087 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 [2022-11-22 01:26:11,127 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:26:11,128 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 01:26:11,149 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-22 01:26:11,149 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 192 treesize of output 191 [2022-11-22 01:26:11,212 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 [2022-11-22 01:26:11,222 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-22 01:26:11,227 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 9 [2022-11-22 01:26:11,240 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 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 [2022-11-22 01:26:11,269 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 128 treesize of output 118 [2022-11-22 01:26:11,300 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 [2022-11-22 01:26:11,419 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 01:26:11,420 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 01:26:11,445 INFO L321 Elim1Store]: treesize reduction 52, result has 28.8 percent of original size [2022-11-22 01:26:11,449 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 168 treesize of output 149 [2022-11-22 01:26:11,825 INFO L321 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2022-11-22 01:26:11,825 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2022-11-22 01:26:12,019 INFO L321 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2022-11-22 01:26:12,019 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2022-11-22 01:26:12,130 INFO L321 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2022-11-22 01:26:12,131 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2022-11-22 01:26:12,224 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 41 for LOIs [2022-11-22 01:26:12,246 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:26:13,799 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1516#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (exists ((|v_ULTIMATE.start_main_~#values~0#1.base_BEFORE_CALL_3| Int) (|v_ULTIMATE.start_main_~n~0#1_BEFORE_CALL_3| Int) (|v_ULTIMATE.start_insert_~set#1.base_BEFORE_CALL_1| Int) (|v_ULTIMATE.start_main_~v~0#1_BEFORE_CALL_3| Int)) (and (<= 100000 |v_ULTIMATE.start_main_~v~0#1_BEFORE_CALL_3|) (<= |v_ULTIMATE.start_main_~n~0#1_BEFORE_CALL_3| 2147483647) (= (select (select |#memory_int| |v_ULTIMATE.start_insert_~set#1.base_BEFORE_CALL_1|) (+ (- 4) (* |v_ULTIMATE.start_main_~n~0#1_BEFORE_CALL_3| 4))) (select (select |#memory_int| |v_ULTIMATE.start_main_~#values~0#1.base_BEFORE_CALL_3|) (+ (* |v_ULTIMATE.start_main_~v~0#1_BEFORE_CALL_3| 4) (- 4)))) (= (ite (not (= (select (select |#memory_int| |v_ULTIMATE.start_insert_~set#1.base_BEFORE_CALL_1|) 4) (select (select |#memory_int| |v_ULTIMATE.start_insert_~set#1.base_BEFORE_CALL_1|) 0))) 1 0) |__VERIFIER_assert_#in~cond|) (< 1 |v_ULTIMATE.start_main_~n~0#1_BEFORE_CALL_3|) (<= 0 |v_ULTIMATE.start_insert_~set#1.base_BEFORE_CALL_1|) (<= 0 |v_ULTIMATE.start_main_~#values~0#1.base_BEFORE_CALL_3|))) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:26:13,800 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:26:13,800 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:26:13,800 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2022-11-22 01:26:13,800 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1729523510] [2022-11-22 01:26:13,800 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:26:13,800 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-11-22 01:26:13,801 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:26:13,801 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-11-22 01:26:13,801 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=223, Invalid=427, Unknown=0, NotChecked=0, Total=650 [2022-11-22 01:26:13,802 INFO L87 Difference]: Start difference. First operand 45 states and 58 transitions. Second operand has 13 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 12 states have internal predecessors, (28), 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) [2022-11-22 01:26:13,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:26:13,966 INFO L93 Difference]: Finished difference Result 130 states and 181 transitions. [2022-11-22 01:26:13,966 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-22 01:26:13,966 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 12 states have internal predecessors, (28), 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 32 [2022-11-22 01:26:13,967 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:26:13,967 INFO L225 Difference]: With dead ends: 130 [2022-11-22 01:26:13,968 INFO L226 Difference]: Without dead ends: 91 [2022-11-22 01:26:13,968 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 76 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 288 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=223, Invalid=427, Unknown=0, NotChecked=0, Total=650 [2022-11-22 01:26:13,969 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 77 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 87 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 123 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 87 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:26:13,969 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [87 Valid, 48 Invalid, 123 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 87 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:26:13,970 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2022-11-22 01:26:13,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 51. [2022-11-22 01:26:13,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 48 states have (on average 1.2916666666666667) internal successors, (62), 48 states have internal predecessors, (62), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-22 01:26:13,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 64 transitions. [2022-11-22 01:26:13,985 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 64 transitions. Word has length 32 [2022-11-22 01:26:13,986 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:26:13,986 INFO L495 AbstractCegarLoop]: Abstraction has 51 states and 64 transitions. [2022-11-22 01:26:13,986 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 12 states have internal predecessors, (28), 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) [2022-11-22 01:26:13,986 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 64 transitions. [2022-11-22 01:26:13,987 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-11-22 01:26:13,987 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:26:13,987 INFO L195 NwaCegarLoop]: trace histogram [10, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:26:13,995 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-22 01:26:14,193 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:26:14,193 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:26:14,194 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:26:14,194 INFO L85 PathProgramCache]: Analyzing trace with hash 27316621, now seen corresponding path program 4 times [2022-11-22 01:26:14,194 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:26:14,194 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [212043586] [2022-11-22 01:26:14,194 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:26:14,194 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:26:14,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:26:14,484 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2022-11-22 01:26:14,484 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:26:14,484 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [212043586] [2022-11-22 01:26:14,485 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [212043586] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:26:14,485 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1321379757] [2022-11-22 01:26:14,485 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 01:26:14,485 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:26:14,485 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:26:14,486 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:26:14,492 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-22 01:26:14,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:26:14,617 INFO L263 TraceCheckSpWp]: Trace formula consists of 336 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-22 01:26:14,627 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:26:14,652 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2022-11-22 01:26:14,652 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:26:14,853 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2022-11-22 01:26:14,854 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1321379757] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:26:14,854 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1303549684] [2022-11-22 01:26:14,856 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-11-22 01:26:14,856 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:26:14,856 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:26:14,856 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:26:14,857 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:26:14,868 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:26:14,880 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-22 01:26:14,880 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 [2022-11-22 01:26:14,889 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:26:14,903 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-22 01:26:14,904 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 [2022-11-22 01:26:14,920 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:26:14,921 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 [2022-11-22 01:26:14,964 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:26:14,965 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 01:26:14,989 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-22 01:26:14,989 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 192 treesize of output 191 [2022-11-22 01:26:15,069 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 [2022-11-22 01:26:15,083 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-22 01:26:15,089 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 9 [2022-11-22 01:26:15,100 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 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 [2022-11-22 01:26:15,130 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 128 treesize of output 118 [2022-11-22 01:26:15,164 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 [2022-11-22 01:26:15,295 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 01:26:15,296 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 01:26:15,322 INFO L321 Elim1Store]: treesize reduction 52, result has 28.8 percent of original size [2022-11-22 01:26:15,322 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 168 treesize of output 149 [2022-11-22 01:26:15,780 INFO L321 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2022-11-22 01:26:15,781 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2022-11-22 01:26:15,968 INFO L321 Elim1Store]: treesize reduction 75, result has 44.9 percent of original size [2022-11-22 01:26:15,969 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 169 treesize of output 208 [2022-11-22 01:26:16,914 INFO L321 Elim1Store]: treesize reduction 75, result has 44.9 percent of original size [2022-11-22 01:26:16,915 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 169 treesize of output 208 [2022-11-22 01:26:17,340 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2022-11-22 01:26:17,351 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:26:18,274 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2099#(and (exists ((|v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_4| Int)) (and (<= 0 |v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_4|) (= |__VERIFIER_assert_#in~cond| (ite (not (= (select (select |#memory_int| |v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_4|) 0) (select (select |#memory_int| |v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_4|) 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 [2022-11-22 01:26:18,274 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:26:18,274 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:26:18,274 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 24 [2022-11-22 01:26:18,274 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [560371951] [2022-11-22 01:26:18,275 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:26:18,275 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-11-22 01:26:18,275 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:26:18,276 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-11-22 01:26:18,277 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=548, Invalid=858, Unknown=0, NotChecked=0, Total=1406 [2022-11-22 01:26:18,277 INFO L87 Difference]: Start difference. First operand 51 states and 64 transitions. Second operand has 25 states, 25 states have (on average 1.6) internal successors, (40), 24 states have internal predecessors, (40), 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) [2022-11-22 01:26:18,605 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:26:18,605 INFO L93 Difference]: Finished difference Result 190 states and 271 transitions. [2022-11-22 01:26:18,605 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-11-22 01:26:18,606 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.6) internal successors, (40), 24 states have internal predecessors, (40), 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 38 [2022-11-22 01:26:18,606 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:26:18,607 INFO L225 Difference]: With dead ends: 190 [2022-11-22 01:26:18,607 INFO L226 Difference]: Without dead ends: 151 [2022-11-22 01:26:18,608 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 614 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=548, Invalid=858, Unknown=0, NotChecked=0, Total=1406 [2022-11-22 01:26:18,608 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 154 mSDsluCounter, 35 mSDsCounter, 0 mSdLazyCounter, 232 mSolverCounterSat, 95 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 176 SdHoareTripleChecker+Valid, 67 SdHoareTripleChecker+Invalid, 327 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 95 IncrementalHoareTripleChecker+Valid, 232 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-22 01:26:18,609 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [176 Valid, 67 Invalid, 327 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [95 Valid, 232 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-22 01:26:18,609 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2022-11-22 01:26:18,632 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 63. [2022-11-22 01:26:18,632 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 60 states have (on average 1.2333333333333334) internal successors, (74), 60 states have internal predecessors, (74), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-22 01:26:18,633 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 76 transitions. [2022-11-22 01:26:18,633 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 76 transitions. Word has length 38 [2022-11-22 01:26:18,633 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:26:18,633 INFO L495 AbstractCegarLoop]: Abstraction has 63 states and 76 transitions. [2022-11-22 01:26:18,634 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.6) internal successors, (40), 24 states have internal predecessors, (40), 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) [2022-11-22 01:26:18,634 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 76 transitions. [2022-11-22 01:26:18,635 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-11-22 01:26:18,635 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:26:18,635 INFO L195 NwaCegarLoop]: trace histogram [22, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:26:18,664 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-22 01:26:18,845 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:26:18,845 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:26:18,846 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:26:18,846 INFO L85 PathProgramCache]: Analyzing trace with hash -1554989811, now seen corresponding path program 5 times [2022-11-22 01:26:18,846 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:26:18,846 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [471333944] [2022-11-22 01:26:18,846 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:26:18,846 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:26:18,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:26:19,650 INFO L134 CoverageAnalysis]: Checked inductivity of 285 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2022-11-22 01:26:19,650 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:26:19,650 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [471333944] [2022-11-22 01:26:19,650 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [471333944] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:26:19,651 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [308988376] [2022-11-22 01:26:19,651 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 01:26:19,651 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:26:19,651 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:26:19,656 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:26:19,679 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-22 01:26:19,793 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-22 01:26:19,794 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:26:19,795 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 6 conjunts are in the unsatisfiable core [2022-11-22 01:26:19,797 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:26:19,876 INFO L134 CoverageAnalysis]: Checked inductivity of 285 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 275 trivial. 0 not checked. [2022-11-22 01:26:19,877 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:26:19,986 INFO L134 CoverageAnalysis]: Checked inductivity of 285 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 275 trivial. 0 not checked. [2022-11-22 01:26:19,986 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [308988376] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:26:19,986 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [132272103] [2022-11-22 01:26:19,988 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-11-22 01:26:19,988 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:26:19,989 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:26:19,989 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:26:19,989 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:26:20,011 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:26:20,027 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-22 01:26:20,028 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 [2022-11-22 01:26:20,036 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:26:20,038 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 [2022-11-22 01:26:20,052 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:26:20,054 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 [2022-11-22 01:26:20,095 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:26:20,096 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 01:26:20,119 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-22 01:26:20,119 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 192 treesize of output 191 [2022-11-22 01:26:20,186 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 [2022-11-22 01:26:20,198 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 9 [2022-11-22 01:26:20,204 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-22 01:26:20,216 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 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 [2022-11-22 01:26:20,244 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 128 treesize of output 118 [2022-11-22 01:26:20,281 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 [2022-11-22 01:26:20,439 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 01:26:20,441 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 01:26:20,467 INFO L321 Elim1Store]: treesize reduction 52, result has 28.8 percent of original size [2022-11-22 01:26:20,468 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 168 treesize of output 149 [2022-11-22 01:26:20,969 INFO L321 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2022-11-22 01:26:20,969 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2022-11-22 01:26:21,230 INFO L321 Elim1Store]: treesize reduction 75, result has 44.9 percent of original size [2022-11-22 01:26:21,231 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 169 treesize of output 208 [2022-11-22 01:26:22,662 INFO L321 Elim1Store]: treesize reduction 75, result has 44.9 percent of original size [2022-11-22 01:26:22,663 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 169 treesize of output 208 [2022-11-22 01:26:22,973 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2022-11-22 01:26:22,988 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:26:24,285 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2896#(and (exists ((|v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_5| Int)) (and (<= 0 |v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_5|) (= (ite (not (= (select (select |#memory_int| |v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_5|) 4) (select (select |#memory_int| |v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_5|) 0))) 1 0) |__VERIFIER_assert_#in~cond|))) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:26:24,285 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:26:24,285 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:26:24,286 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 7, 7] total 35 [2022-11-22 01:26:24,286 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [333290571] [2022-11-22 01:26:24,286 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:26:24,287 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-11-22 01:26:24,287 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:26:24,288 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-11-22 01:26:24,289 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=613, Invalid=1643, Unknown=0, NotChecked=0, Total=2256 [2022-11-22 01:26:24,289 INFO L87 Difference]: Start difference. First operand 63 states and 76 transitions. Second operand has 35 states, 35 states have (on average 1.5142857142857142) internal successors, (53), 35 states have internal predecessors, (53), 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) [2022-11-22 01:26:24,887 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:26:24,887 INFO L93 Difference]: Finished difference Result 245 states and 347 transitions. [2022-11-22 01:26:24,888 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-11-22 01:26:24,888 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.5142857142857142) internal successors, (53), 35 states have internal predecessors, (53), 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 50 [2022-11-22 01:26:24,888 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:26:24,889 INFO L225 Difference]: With dead ends: 245 [2022-11-22 01:26:24,889 INFO L226 Difference]: Without dead ends: 206 [2022-11-22 01:26:24,891 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 126 SyntacticMatches, 0 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1050 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=963, Invalid=2343, Unknown=0, NotChecked=0, Total=3306 [2022-11-22 01:26:24,892 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 581 mSDsluCounter, 69 mSDsCounter, 0 mSdLazyCounter, 261 mSolverCounterSat, 174 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 604 SdHoareTripleChecker+Valid, 101 SdHoareTripleChecker+Invalid, 435 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 174 IncrementalHoareTripleChecker+Valid, 261 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-22 01:26:24,892 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [604 Valid, 101 Invalid, 435 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [174 Valid, 261 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-22 01:26:24,893 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 206 states. [2022-11-22 01:26:24,921 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 206 to 112. [2022-11-22 01:26:24,922 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 109 states have (on average 1.2935779816513762) internal successors, (141), 109 states have internal predecessors, (141), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-22 01:26:24,923 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 143 transitions. [2022-11-22 01:26:24,923 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 143 transitions. Word has length 50 [2022-11-22 01:26:24,923 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:26:24,923 INFO L495 AbstractCegarLoop]: Abstraction has 112 states and 143 transitions. [2022-11-22 01:26:24,924 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.5142857142857142) internal successors, (53), 35 states have internal predecessors, (53), 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) [2022-11-22 01:26:24,924 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 143 transitions. [2022-11-22 01:26:24,925 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2022-11-22 01:26:24,926 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:26:24,926 INFO L195 NwaCegarLoop]: trace histogram [23, 10, 10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:26:24,940 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-22 01:26:25,132 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:26:25,132 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:26:25,132 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:26:25,132 INFO L85 PathProgramCache]: Analyzing trace with hash 1036958695, now seen corresponding path program 6 times [2022-11-22 01:26:25,133 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:26:25,133 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1312822555] [2022-11-22 01:26:25,133 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:26:25,133 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:26:25,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:26:26,046 INFO L134 CoverageAnalysis]: Checked inductivity of 476 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2022-11-22 01:26:26,046 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:26:26,046 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1312822555] [2022-11-22 01:26:26,046 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1312822555] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:26:26,047 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1748750598] [2022-11-22 01:26:26,047 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 01:26:26,047 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:26:26,047 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:26:26,048 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:26:26,051 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-22 01:26:26,254 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 01:26:26,255 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:26:26,259 INFO L263 TraceCheckSpWp]: Trace formula consists of 699 conjuncts, 25 conjunts are in the unsatisfiable core [2022-11-22 01:26:26,262 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:26:26,312 INFO L134 CoverageAnalysis]: Checked inductivity of 476 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2022-11-22 01:26:26,312 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:26:27,154 INFO L134 CoverageAnalysis]: Checked inductivity of 476 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2022-11-22 01:26:27,154 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1748750598] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:26:27,154 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [322557949] [2022-11-22 01:26:27,156 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-11-22 01:26:27,157 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:26:27,157 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:26:27,157 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:26:27,157 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:26:27,170 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:26:27,188 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-22 01:26:27,188 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 [2022-11-22 01:26:27,199 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:26:27,200 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 [2022-11-22 01:26:27,217 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:26:27,218 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 [2022-11-22 01:26:27,266 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:26:27,267 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 01:26:27,290 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-22 01:26:27,290 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 192 treesize of output 191 [2022-11-22 01:26:27,364 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 [2022-11-22 01:26:27,376 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 9 [2022-11-22 01:26:27,382 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-22 01:26:27,397 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 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 [2022-11-22 01:26:27,432 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 128 treesize of output 118 [2022-11-22 01:26:27,470 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 [2022-11-22 01:26:27,579 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 01:26:27,580 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 01:26:27,601 INFO L321 Elim1Store]: treesize reduction 52, result has 28.8 percent of original size [2022-11-22 01:26:27,601 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 168 treesize of output 149 [2022-11-22 01:26:28,014 INFO L321 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2022-11-22 01:26:28,014 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2022-11-22 01:26:28,184 INFO L321 Elim1Store]: treesize reduction 75, result has 44.9 percent of original size [2022-11-22 01:26:28,185 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 169 treesize of output 208 [2022-11-22 01:26:29,233 INFO L321 Elim1Store]: treesize reduction 75, result has 44.9 percent of original size [2022-11-22 01:26:29,234 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 169 treesize of output 208 [2022-11-22 01:26:29,568 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2022-11-22 01:26:29,580 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:26:30,557 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4074#(and (exists ((|v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_6| Int)) (and (= |__VERIFIER_assert_#in~cond| (ite (not (= (select (select |#memory_int| |v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_6|) 4) (select (select |#memory_int| |v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_6|) 0))) 1 0)) (<= 0 |v_ULTIMATE.start_main_~#set~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 [2022-11-22 01:26:30,557 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:26:30,557 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:26:30,557 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 50 [2022-11-22 01:26:30,557 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1016609404] [2022-11-22 01:26:30,557 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:26:30,558 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2022-11-22 01:26:30,558 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:26:30,559 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2022-11-22 01:26:30,560 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1757, Invalid=2275, Unknown=0, NotChecked=0, Total=4032 [2022-11-22 01:26:30,561 INFO L87 Difference]: Start difference. First operand 112 states and 143 transitions. Second operand has 51 states, 51 states have (on average 1.2941176470588236) internal successors, (66), 50 states have internal predecessors, (66), 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) [2022-11-22 01:26:31,276 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:26:31,276 INFO L93 Difference]: Finished difference Result 416 states and 598 transitions. [2022-11-22 01:26:31,277 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2022-11-22 01:26:31,277 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 1.2941176470588236) internal successors, (66), 50 states have internal predecessors, (66), 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 75 [2022-11-22 01:26:31,277 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:26:31,279 INFO L225 Difference]: With dead ends: 416 [2022-11-22 01:26:31,280 INFO L226 Difference]: Without dead ends: 329 [2022-11-22 01:26:31,281 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 248 GetRequests, 186 SyntacticMatches, 0 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1290 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1757, Invalid=2275, Unknown=0, NotChecked=0, Total=4032 [2022-11-22 01:26:31,282 INFO L413 NwaCegarLoop]: 58 mSDtfsCounter, 485 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 438 mSolverCounterSat, 330 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 533 SdHoareTripleChecker+Valid, 86 SdHoareTripleChecker+Invalid, 768 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 330 IncrementalHoareTripleChecker+Valid, 438 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-22 01:26:31,282 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [533 Valid, 86 Invalid, 768 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [330 Valid, 438 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-22 01:26:31,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 329 states. [2022-11-22 01:26:31,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 329 to 137. [2022-11-22 01:26:31,315 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 137 states, 134 states have (on average 1.2388059701492538) internal successors, (166), 134 states have internal predecessors, (166), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-22 01:26:31,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 168 transitions. [2022-11-22 01:26:31,316 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 168 transitions. Word has length 75 [2022-11-22 01:26:31,316 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:26:31,316 INFO L495 AbstractCegarLoop]: Abstraction has 137 states and 168 transitions. [2022-11-22 01:26:31,316 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 1.2941176470588236) internal successors, (66), 50 states have internal predecessors, (66), 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) [2022-11-22 01:26:31,317 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 168 transitions. [2022-11-22 01:26:31,318 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2022-11-22 01:26:31,318 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:26:31,318 INFO L195 NwaCegarLoop]: trace histogram [48, 10, 10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:26:31,336 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-22 01:26:31,536 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:26:31,536 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:26:31,536 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:26:31,537 INFO L85 PathProgramCache]: Analyzing trace with hash -758359635, now seen corresponding path program 7 times [2022-11-22 01:26:31,537 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:26:31,537 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [862285190] [2022-11-22 01:26:31,537 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:26:31,537 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:26:31,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:26:34,395 INFO L134 CoverageAnalysis]: Checked inductivity of 1376 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2022-11-22 01:26:34,395 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:26:34,396 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [862285190] [2022-11-22 01:26:34,396 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [862285190] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:26:34,396 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [305389143] [2022-11-22 01:26:34,396 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 01:26:34,396 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:26:34,396 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:26:34,400 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:26:34,412 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-22 01:26:34,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:26:34,681 INFO L263 TraceCheckSpWp]: Trace formula consists of 924 conjuncts, 50 conjunts are in the unsatisfiable core [2022-11-22 01:26:34,687 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:26:34,785 INFO L134 CoverageAnalysis]: Checked inductivity of 1376 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2022-11-22 01:26:34,785 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:26:37,875 INFO L134 CoverageAnalysis]: Checked inductivity of 1376 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2022-11-22 01:26:37,875 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [305389143] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:26:37,875 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [74487529] [2022-11-22 01:26:37,877 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-11-22 01:26:37,878 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:26:37,878 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:26:37,878 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:26:37,878 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:26:37,894 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:26:37,910 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-22 01:26:37,910 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 [2022-11-22 01:26:37,917 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:26:37,918 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 [2022-11-22 01:26:37,941 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:26:37,941 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 [2022-11-22 01:26:37,971 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:26:37,972 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 01:26:37,993 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-22 01:26:37,994 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 192 treesize of output 191 [2022-11-22 01:26:38,050 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-22 01:26:38,061 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 9 [2022-11-22 01:26:38,067 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-22 01:26:38,080 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 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 [2022-11-22 01:26:38,129 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 128 treesize of output 118 [2022-11-22 01:26:38,161 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 [2022-11-22 01:26:38,268 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 01:26:38,269 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 01:26:38,290 INFO L321 Elim1Store]: treesize reduction 52, result has 28.8 percent of original size [2022-11-22 01:26:38,290 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 168 treesize of output 149 [2022-11-22 01:26:38,598 INFO L321 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2022-11-22 01:26:38,599 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2022-11-22 01:26:38,856 INFO L321 Elim1Store]: treesize reduction 75, result has 44.9 percent of original size [2022-11-22 01:26:38,856 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 169 treesize of output 208 [2022-11-22 01:26:39,421 INFO L321 Elim1Store]: treesize reduction 75, result has 44.9 percent of original size [2022-11-22 01:26:39,422 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 169 treesize of output 208 [2022-11-22 01:26:39,769 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2022-11-22 01:26:39,779 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:26:40,867 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5793#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (exists ((|v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_7| Int)) (and (= (ite (not (= (select (select |#memory_int| |v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_7|) 0) (select (select |#memory_int| |v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_7|) 4))) 1 0) |__VERIFIER_assert_#in~cond|) (<= 0 |v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_7|))) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:26:40,867 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:26:40,867 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:26:40,868 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50] total 100 [2022-11-22 01:26:40,868 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1995170016] [2022-11-22 01:26:40,868 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:26:40,869 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 101 states [2022-11-22 01:26:40,869 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:26:40,870 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2022-11-22 01:26:40,874 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5982, Invalid=6900, Unknown=0, NotChecked=0, Total=12882 [2022-11-22 01:26:40,874 INFO L87 Difference]: Start difference. First operand 137 states and 168 transitions. Second operand has 101 states, 101 states have (on average 1.1485148514851484) internal successors, (116), 100 states have internal predecessors, (116), 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) [2022-11-22 01:26:43,562 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:26:43,562 INFO L93 Difference]: Finished difference Result 666 states and 973 transitions. [2022-11-22 01:26:43,563 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2022-11-22 01:26:43,563 INFO L78 Accepts]: Start accepts. Automaton has has 101 states, 101 states have (on average 1.1485148514851484) internal successors, (116), 100 states have internal predecessors, (116), 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 100 [2022-11-22 01:26:43,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:26:43,567 INFO L225 Difference]: With dead ends: 666 [2022-11-22 01:26:43,568 INFO L226 Difference]: Without dead ends: 579 [2022-11-22 01:26:43,570 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 348 GetRequests, 236 SyntacticMatches, 0 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2590 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=5982, Invalid=6900, Unknown=0, NotChecked=0, Total=12882 [2022-11-22 01:26:43,571 INFO L413 NwaCegarLoop]: 108 mSDtfsCounter, 1109 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 938 mSolverCounterSat, 847 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1207 SdHoareTripleChecker+Valid, 129 SdHoareTripleChecker+Invalid, 1785 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 847 IncrementalHoareTripleChecker+Valid, 938 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:26:43,571 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1207 Valid, 129 Invalid, 1785 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [847 Valid, 938 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-11-22 01:26:43,572 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 579 states. [2022-11-22 01:26:43,633 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 579 to 187. [2022-11-22 01:26:43,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 187 states, 184 states have (on average 1.173913043478261) internal successors, (216), 184 states have internal predecessors, (216), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-22 01:26:43,635 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 218 transitions. [2022-11-22 01:26:43,635 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 218 transitions. Word has length 100 [2022-11-22 01:26:43,635 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:26:43,636 INFO L495 AbstractCegarLoop]: Abstraction has 187 states and 218 transitions. [2022-11-22 01:26:43,636 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 101 states, 101 states have (on average 1.1485148514851484) internal successors, (116), 100 states have internal predecessors, (116), 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) [2022-11-22 01:26:43,636 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 218 transitions. [2022-11-22 01:26:43,638 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2022-11-22 01:26:43,639 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:26:43,639 INFO L195 NwaCegarLoop]: trace histogram [98, 10, 10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:26:43,645 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-22 01:26:43,844 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-11-22 01:26:43,844 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:26:43,845 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:26:43,845 INFO L85 PathProgramCache]: Analyzing trace with hash 622135021, now seen corresponding path program 8 times [2022-11-22 01:26:43,845 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:26:43,845 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1533399530] [2022-11-22 01:26:43,845 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:26:43,845 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:26:44,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:26:51,587 INFO L134 CoverageAnalysis]: Checked inductivity of 5051 backedges. 0 proven. 4851 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2022-11-22 01:26:51,588 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:26:51,588 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1533399530] [2022-11-22 01:26:51,588 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1533399530] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:26:51,588 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1050004948] [2022-11-22 01:26:51,589 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 01:26:51,589 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:26:51,589 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:26:51,591 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:26:51,593 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-22 01:26:52,943 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-11-22 01:26:52,943 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:26:52,948 INFO L263 TraceCheckSpWp]: Trace formula consists of 422 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-22 01:26:52,950 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:26:53,464 INFO L134 CoverageAnalysis]: Checked inductivity of 5051 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 4996 trivial. 0 not checked. [2022-11-22 01:26:53,464 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:26:54,094 INFO L134 CoverageAnalysis]: Checked inductivity of 5051 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 4996 trivial. 0 not checked. [2022-11-22 01:26:54,094 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1050004948] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:26:54,094 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [404917297] [2022-11-22 01:26:54,096 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-11-22 01:26:54,096 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:26:54,096 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:26:54,096 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:26:54,096 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:26:54,107 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:26:54,122 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-22 01:26:54,122 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 [2022-11-22 01:26:54,136 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:26:54,137 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 [2022-11-22 01:26:54,150 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:26:54,151 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 [2022-11-22 01:26:54,189 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:26:54,192 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:26:54,204 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-22 01:26:54,205 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 202 treesize of output 190 [2022-11-22 01:26:54,237 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 [2022-11-22 01:26:54,247 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-22 01:26:54,254 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 9 [2022-11-22 01:26:54,266 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-22 01:26:54,302 INFO L321 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2022-11-22 01:26:54,302 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 118 treesize of output 119 [2022-11-22 01:26:54,346 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 [2022-11-22 01:26:54,444 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 01:26:54,445 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 01:26:54,466 INFO L321 Elim1Store]: treesize reduction 52, result has 28.8 percent of original size [2022-11-22 01:26:54,467 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 168 treesize of output 149 [2022-11-22 01:26:54,771 INFO L321 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2022-11-22 01:26:54,771 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2022-11-22 01:26:55,015 INFO L321 Elim1Store]: treesize reduction 75, result has 44.9 percent of original size [2022-11-22 01:26:55,015 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 169 treesize of output 208 [2022-11-22 01:26:55,990 INFO L321 Elim1Store]: treesize reduction 75, result has 44.9 percent of original size [2022-11-22 01:26:55,990 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 169 treesize of output 208 [2022-11-22 01:26:56,220 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2022-11-22 01:26:56,231 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:26:57,546 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8384#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (exists ((|v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_8| Int)) (and (= (ite (not (= (select (select |#memory_int| |v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_8|) 0) (select (select |#memory_int| |v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_8|) 4))) 1 0) |__VERIFIER_assert_#in~cond|) (<= 0 |v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_8|))) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:26:57,546 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:26:57,547 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:26:57,547 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [100, 13, 13] total 123 [2022-11-22 01:26:57,547 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [947126745] [2022-11-22 01:26:57,547 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:26:57,547 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 123 states [2022-11-22 01:26:57,547 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:26:57,548 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 123 interpolants. [2022-11-22 01:26:57,551 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6257, Invalid=12103, Unknown=0, NotChecked=0, Total=18360 [2022-11-22 01:26:57,552 INFO L87 Difference]: Start difference. First operand 187 states and 218 transitions. Second operand has 123 states, 123 states have (on average 1.146341463414634) internal successors, (141), 123 states have internal predecessors, (141), 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) [2022-11-22 01:27:01,547 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:27:01,547 INFO L93 Difference]: Finished difference Result 769 states and 1089 transitions. [2022-11-22 01:27:01,548 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 123 states. [2022-11-22 01:27:01,548 INFO L78 Accepts]: Start accepts. Automaton has has 123 states, 123 states have (on average 1.146341463414634) internal successors, (141), 123 states have internal predecessors, (141), 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 150 [2022-11-22 01:27:01,548 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:27:01,551 INFO L225 Difference]: With dead ends: 769 [2022-11-22 01:27:01,551 INFO L226 Difference]: Without dead ends: 682 [2022-11-22 01:27:01,555 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 570 GetRequests, 414 SyntacticMatches, 0 SemanticMatches, 156 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5213 ImplicationChecksByTransitivity, 6.8s TimeCoverageRelationStatistics Valid=8963, Invalid=15843, Unknown=0, NotChecked=0, Total=24806 [2022-11-22 01:27:01,555 INFO L413 NwaCegarLoop]: 108 mSDtfsCounter, 2303 mSDsluCounter, 331 mSDsCounter, 0 mSdLazyCounter, 1272 mSolverCounterSat, 703 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2402 SdHoareTripleChecker+Valid, 439 SdHoareTripleChecker+Invalid, 1975 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 703 IncrementalHoareTripleChecker+Valid, 1272 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2022-11-22 01:27:01,556 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2402 Valid, 439 Invalid, 1975 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [703 Valid, 1272 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2022-11-22 01:27:01,557 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 682 states. [2022-11-22 01:27:01,634 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 682 to 284. [2022-11-22 01:27:01,635 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 284 states, 281 states have (on average 1.2419928825622777) internal successors, (349), 281 states have internal predecessors, (349), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-22 01:27:01,636 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 284 states to 284 states and 351 transitions. [2022-11-22 01:27:01,637 INFO L78 Accepts]: Start accepts. Automaton has 284 states and 351 transitions. Word has length 150 [2022-11-22 01:27:01,637 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:27:01,637 INFO L495 AbstractCegarLoop]: Abstraction has 284 states and 351 transitions. [2022-11-22 01:27:01,637 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 123 states, 123 states have (on average 1.146341463414634) internal successors, (141), 123 states have internal predecessors, (141), 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) [2022-11-22 01:27:01,638 INFO L276 IsEmpty]: Start isEmpty. Operand 284 states and 351 transitions. [2022-11-22 01:27:01,640 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 200 [2022-11-22 01:27:01,640 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:27:01,640 INFO L195 NwaCegarLoop]: trace histogram [99, 22, 22, 22, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:27:01,652 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-11-22 01:27:01,855 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:27:01,855 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:27:01,856 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:27:01,856 INFO L85 PathProgramCache]: Analyzing trace with hash -1656544985, now seen corresponding path program 9 times [2022-11-22 01:27:01,856 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:27:01,856 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [34275774] [2022-11-22 01:27:01,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:27:01,856 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:27:02,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:27:10,106 INFO L134 CoverageAnalysis]: Checked inductivity of 5918 backedges. 0 proven. 4950 refuted. 0 times theorem prover too weak. 968 trivial. 0 not checked. [2022-11-22 01:27:10,106 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:27:10,106 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [34275774] [2022-11-22 01:27:10,106 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [34275774] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:27:10,106 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [670302725] [2022-11-22 01:27:10,106 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 01:27:10,106 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:27:10,107 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:27:10,108 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:27:10,111 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-22 01:27:10,606 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 01:27:10,606 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:27:10,615 INFO L263 TraceCheckSpWp]: Trace formula consists of 1875 conjuncts, 101 conjunts are in the unsatisfiable core [2022-11-22 01:27:10,620 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:27:10,775 INFO L134 CoverageAnalysis]: Checked inductivity of 5918 backedges. 0 proven. 4950 refuted. 0 times theorem prover too weak. 968 trivial. 0 not checked. [2022-11-22 01:27:10,775 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:27:22,858 INFO L134 CoverageAnalysis]: Checked inductivity of 5918 backedges. 0 proven. 4950 refuted. 0 times theorem prover too weak. 968 trivial. 0 not checked. [2022-11-22 01:27:22,858 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [670302725] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:27:22,858 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1195578051] [2022-11-22 01:27:22,859 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-11-22 01:27:22,860 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:27:22,860 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:27:22,860 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:27:22,860 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:27:22,870 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:27:22,884 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-22 01:27:22,884 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 [2022-11-22 01:27:22,891 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:27:22,892 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 [2022-11-22 01:27:22,906 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:27:22,907 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 [2022-11-22 01:27:22,940 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:27:22,942 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:27:22,953 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-22 01:27:22,954 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 202 treesize of output 190 [2022-11-22 01:27:22,987 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 [2022-11-22 01:27:22,998 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-22 01:27:23,004 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 9 [2022-11-22 01:27:23,014 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 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 [2022-11-22 01:27:23,038 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 128 treesize of output 118 [2022-11-22 01:27:23,068 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 [2022-11-22 01:27:23,194 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 01:27:23,195 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 01:27:23,219 INFO L321 Elim1Store]: treesize reduction 52, result has 28.8 percent of original size [2022-11-22 01:27:23,220 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 168 treesize of output 149 [2022-11-22 01:27:23,642 INFO L321 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2022-11-22 01:27:23,643 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2022-11-22 01:27:23,788 INFO L321 Elim1Store]: treesize reduction 75, result has 44.9 percent of original size [2022-11-22 01:27:23,788 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 169 treesize of output 208 [2022-11-22 01:27:24,590 INFO L321 Elim1Store]: treesize reduction 75, result has 44.9 percent of original size [2022-11-22 01:27:24,590 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 169 treesize of output 208 [2022-11-22 01:27:24,805 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2022-11-22 01:27:24,819 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:27:25,990 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11768#(and (exists ((|v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_9| Int)) (and (= |__VERIFIER_assert_#in~cond| (ite (not (= (select (select |#memory_int| |v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_9|) 4) (select (select |#memory_int| |v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_9|) 0))) 1 0)) (<= 0 |v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_9|))) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:27:25,990 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:27:25,990 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:27:25,990 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [101, 101, 101] total 202 [2022-11-22 01:27:25,991 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [280300444] [2022-11-22 01:27:25,991 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:27:25,991 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 203 states [2022-11-22 01:27:25,991 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:27:25,995 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 203 interpolants. [2022-11-22 01:27:26,000 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22353, Invalid=24087, Unknown=0, NotChecked=0, Total=46440 [2022-11-22 01:27:26,001 INFO L87 Difference]: Start difference. First operand 284 states and 351 transitions. Second operand has 203 states, 203 states have (on average 1.0738916256157636) internal successors, (218), 202 states have internal predecessors, (218), 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) [2022-11-22 01:27:43,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:27:43,688 INFO L93 Difference]: Finished difference Result 1368 states and 2002 transitions. [2022-11-22 01:27:43,688 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 202 states. [2022-11-22 01:27:43,689 INFO L78 Accepts]: Start accepts. Automaton has has 203 states, 203 states have (on average 1.0738916256157636) internal successors, (218), 202 states have internal predecessors, (218), 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 199 [2022-11-22 01:27:43,689 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:27:43,694 INFO L225 Difference]: With dead ends: 1368 [2022-11-22 01:27:43,695 INFO L226 Difference]: Without dead ends: 1185 [2022-11-22 01:27:43,699 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 696 GetRequests, 482 SyntacticMatches, 0 SemanticMatches, 214 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5242 ImplicationChecksByTransitivity, 17.3s TimeCoverageRelationStatistics Valid=22353, Invalid=24087, Unknown=0, NotChecked=0, Total=46440 [2022-11-22 01:27:43,700 INFO L413 NwaCegarLoop]: 210 mSDtfsCounter, 2304 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 2117 mSolverCounterSat, 1835 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2504 SdHoareTripleChecker+Valid, 266 SdHoareTripleChecker+Invalid, 3952 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1835 IncrementalHoareTripleChecker+Valid, 2117 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2022-11-22 01:27:43,700 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2504 Valid, 266 Invalid, 3952 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1835 Valid, 2117 Invalid, 0 Unknown, 0 Unchecked, 2.3s Time] [2022-11-22 01:27:43,701 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1185 states. [2022-11-22 01:27:43,813 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1185 to 385. [2022-11-22 01:27:43,814 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 385 states, 382 states have (on average 1.1780104712041886) internal successors, (450), 382 states have internal predecessors, (450), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-22 01:27:43,816 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 385 states to 385 states and 452 transitions. [2022-11-22 01:27:43,816 INFO L78 Accepts]: Start accepts. Automaton has 385 states and 452 transitions. Word has length 199 [2022-11-22 01:27:43,817 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:27:43,817 INFO L495 AbstractCegarLoop]: Abstraction has 385 states and 452 transitions. [2022-11-22 01:27:43,817 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 203 states, 203 states have (on average 1.0738916256157636) internal successors, (218), 202 states have internal predecessors, (218), 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) [2022-11-22 01:27:43,818 INFO L276 IsEmpty]: Start isEmpty. Operand 385 states and 452 transitions. [2022-11-22 01:27:43,822 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 301 [2022-11-22 01:27:43,822 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:27:43,822 INFO L195 NwaCegarLoop]: trace histogram [200, 22, 22, 22, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:27:43,831 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-22 01:27:44,031 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:27:44,031 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:27:44,032 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:27:44,032 INFO L85 PathProgramCache]: Analyzing trace with hash 252159341, now seen corresponding path program 10 times [2022-11-22 01:27:44,032 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:27:44,032 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [663601368] [2022-11-22 01:27:44,032 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:27:44,032 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:27:44,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:28:10,819 INFO L134 CoverageAnalysis]: Checked inductivity of 21068 backedges. 0 proven. 20100 refuted. 0 times theorem prover too weak. 968 trivial. 0 not checked. [2022-11-22 01:28:10,819 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:28:10,820 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [663601368] [2022-11-22 01:28:10,820 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [663601368] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:28:10,820 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1595764868] [2022-11-22 01:28:10,820 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 01:28:10,820 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:28:10,821 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:28:10,822 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:28:10,824 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-22 01:28:11,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:28:11,581 INFO L263 TraceCheckSpWp]: Trace formula consists of 2784 conjuncts, 202 conjunts are in the unsatisfiable core [2022-11-22 01:28:11,590 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:28:11,928 INFO L134 CoverageAnalysis]: Checked inductivity of 21068 backedges. 0 proven. 20100 refuted. 0 times theorem prover too weak. 968 trivial. 0 not checked. [2022-11-22 01:28:11,928 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:29:00,360 INFO L134 CoverageAnalysis]: Checked inductivity of 21068 backedges. 0 proven. 20100 refuted. 0 times theorem prover too weak. 968 trivial. 0 not checked. [2022-11-22 01:29:00,360 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1595764868] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:29:00,361 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [218140492] [2022-11-22 01:29:00,362 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-11-22 01:29:00,363 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:29:00,363 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:29:00,363 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:29:00,363 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:29:00,375 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:29:00,389 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-22 01:29:00,390 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 [2022-11-22 01:29:00,398 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:29:00,399 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 [2022-11-22 01:29:00,412 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:29:00,413 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 [2022-11-22 01:29:00,451 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:29:00,452 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 01:29:00,473 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-22 01:29:00,474 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 192 treesize of output 191 [2022-11-22 01:29:00,540 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 [2022-11-22 01:29:00,550 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-22 01:29:00,556 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 9 [2022-11-22 01:29:00,573 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 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 [2022-11-22 01:29:00,603 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 128 treesize of output 118 [2022-11-22 01:29:00,631 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 [2022-11-22 01:29:00,753 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 01:29:00,754 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 01:29:00,777 INFO L321 Elim1Store]: treesize reduction 52, result has 28.8 percent of original size [2022-11-22 01:29:00,778 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 168 treesize of output 149 [2022-11-22 01:29:01,193 INFO L321 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2022-11-22 01:29:01,193 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2022-11-22 01:29:01,343 INFO L321 Elim1Store]: treesize reduction 75, result has 44.9 percent of original size [2022-11-22 01:29:01,343 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 169 treesize of output 208 [2022-11-22 01:29:01,822 INFO L321 Elim1Store]: treesize reduction 75, result has 44.9 percent of original size [2022-11-22 01:29:01,822 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 169 treesize of output 208 [2022-11-22 01:29:02,081 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2022-11-22 01:29:02,091 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:29:03,516 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '17203#(and (exists ((|v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_10| Int)) (and (<= 0 |v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_10|) (= |__VERIFIER_assert_#in~cond| (ite (not (= (select (select |#memory_int| |v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_10|) 4) (select (select |#memory_int| |v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_10|) 0))) 1 0)))) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:29:03,516 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:29:03,516 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:29:03,516 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [202, 202, 202] total 404 [2022-11-22 01:29:03,517 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1217687694] [2022-11-22 01:29:03,517 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:29:03,518 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 405 states [2022-11-22 01:29:03,518 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:29:03,528 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 405 interpolants. [2022-11-22 01:29:03,536 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=85478, Invalid=88828, Unknown=0, NotChecked=0, Total=174306 [2022-11-22 01:29:03,537 INFO L87 Difference]: Start difference. First operand 385 states and 452 transitions. Second operand has 405 states, 405 states have (on average 1.037037037037037) internal successors, (420), 404 states have internal predecessors, (420), 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) [2022-11-22 01:33:33,620 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:33:33,620 INFO L93 Difference]: Finished difference Result 2378 states and 3517 transitions. [2022-11-22 01:33:33,620 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 404 states. [2022-11-22 01:33:33,621 INFO L78 Accepts]: Start accepts. Automaton has has 405 states, 405 states have (on average 1.037037037037037) internal successors, (420), 404 states have internal predecessors, (420), 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 300 [2022-11-22 01:33:33,622 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:33:33,633 INFO L225 Difference]: With dead ends: 2378 [2022-11-22 01:33:33,633 INFO L226 Difference]: Without dead ends: 2195 [2022-11-22 01:33:33,649 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1100 GetRequests, 684 SyntacticMatches, 0 SemanticMatches, 416 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10494 ImplicationChecksByTransitivity, 65.6s TimeCoverageRelationStatistics Valid=85478, Invalid=88828, Unknown=0, NotChecked=0, Total=174306 [2022-11-22 01:33:33,650 INFO L413 NwaCegarLoop]: 412 mSDtfsCounter, 5175 mSDsluCounter, 49 mSDsCounter, 0 mSdLazyCounter, 4596 mSolverCounterSat, 4304 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5577 SdHoareTripleChecker+Valid, 461 SdHoareTripleChecker+Invalid, 8900 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 4304 IncrementalHoareTripleChecker+Valid, 4596 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.8s IncrementalHoareTripleChecker+Time [2022-11-22 01:33:33,651 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5577 Valid, 461 Invalid, 8900 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [4304 Valid, 4596 Invalid, 0 Unknown, 0 Unchecked, 5.8s Time] [2022-11-22 01:33:33,654 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2195 states. [2022-11-22 01:33:33,928 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2195 to 587. [2022-11-22 01:33:33,929 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 587 states, 584 states have (on average 1.1164383561643836) internal successors, (652), 584 states have internal predecessors, (652), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-22 01:33:33,932 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 587 states to 587 states and 654 transitions. [2022-11-22 01:33:33,932 INFO L78 Accepts]: Start accepts. Automaton has 587 states and 654 transitions. Word has length 300 [2022-11-22 01:33:33,933 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:33:33,933 INFO L495 AbstractCegarLoop]: Abstraction has 587 states and 654 transitions. [2022-11-22 01:33:33,934 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 405 states, 405 states have (on average 1.037037037037037) internal successors, (420), 404 states have internal predecessors, (420), 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) [2022-11-22 01:33:33,934 INFO L276 IsEmpty]: Start isEmpty. Operand 587 states and 654 transitions. [2022-11-22 01:33:33,948 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 503 [2022-11-22 01:33:33,948 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:33:33,949 INFO L195 NwaCegarLoop]: trace histogram [402, 22, 22, 22, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:33:33,969 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-11-22 01:33:34,161 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-11-22 01:33:34,161 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:33:34,162 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:33:34,162 INFO L85 PathProgramCache]: Analyzing trace with hash 2000714157, now seen corresponding path program 11 times [2022-11-22 01:33:34,162 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:33:34,162 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [123242630] [2022-11-22 01:33:34,162 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:33:34,162 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:33:35,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:35:41,516 INFO L134 CoverageAnalysis]: Checked inductivity of 81971 backedges. 0 proven. 81003 refuted. 0 times theorem prover too weak. 968 trivial. 0 not checked. [2022-11-22 01:35:41,516 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:35:41,517 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [123242630] [2022-11-22 01:35:41,517 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [123242630] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:35:41,517 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1535999591] [2022-11-22 01:35:41,517 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 01:35:41,518 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:35:41,518 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:35:41,523 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:35:41,532 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81f1f0e7-651c-4bc9-8dc9-5125dcb53f23/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-22 01:35:43,808 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-11-22 01:35:43,808 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:35:43,815 INFO L263 TraceCheckSpWp]: Trace formula consists of 422 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-22 01:35:43,830 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:35:45,500 INFO L134 CoverageAnalysis]: Checked inductivity of 81971 backedges. 104 proven. 1 refuted. 0 times theorem prover too weak. 81866 trivial. 0 not checked. [2022-11-22 01:35:45,500 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:35:48,692 INFO L134 CoverageAnalysis]: Checked inductivity of 81971 backedges. 104 proven. 1 refuted. 0 times theorem prover too weak. 81866 trivial. 0 not checked. [2022-11-22 01:35:48,693 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1535999591] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:35:48,693 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [425784444] [2022-11-22 01:35:48,695 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-11-22 01:35:48,695 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:35:48,696 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:35:48,696 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:35:48,696 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:35:48,710 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:35:48,725 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-22 01:35:48,726 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 [2022-11-22 01:35:48,735 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:35:48,754 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-22 01:35:48,754 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 [2022-11-22 01:35:48,773 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:35:48,774 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 [2022-11-22 01:35:48,820 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:35:48,823 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:35:48,838 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-22 01:35:48,839 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 202 treesize of output 190 [2022-11-22 01:35:48,881 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 [2022-11-22 01:35:48,895 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 9 [2022-11-22 01:35:48,901 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-22 01:35:48,917 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-22 01:35:48,969 INFO L321 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2022-11-22 01:35:48,969 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 118 treesize of output 119 [2022-11-22 01:35:49,025 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 [2022-11-22 01:35:49,149 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 01:35:49,150 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 01:35:49,178 INFO L321 Elim1Store]: treesize reduction 52, result has 28.8 percent of original size [2022-11-22 01:35:49,178 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 168 treesize of output 149 [2022-11-22 01:35:49,616 INFO L321 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2022-11-22 01:35:49,617 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2022-11-22 01:35:49,801 INFO L321 Elim1Store]: treesize reduction 75, result has 44.9 percent of original size [2022-11-22 01:35:49,802 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 169 treesize of output 208 [2022-11-22 01:35:50,390 INFO L321 Elim1Store]: treesize reduction 75, result has 44.9 percent of original size [2022-11-22 01:35:50,390 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 169 treesize of output 208 [2022-11-22 01:35:50,643 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2022-11-22 01:35:50,655 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:35:53,289 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '26080#(and (exists ((|v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_11| Int)) (and (<= 0 |v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_11|) (= |__VERIFIER_assert_#in~cond| (ite (not (= (select (select |#memory_int| |v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_11|) 0) (select (select |#memory_int| |v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_11|) 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 [2022-11-22 01:35:53,289 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:35:53,289 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:35:53,290 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [404, 5, 5] total 412 [2022-11-22 01:35:53,290 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1002333813] [2022-11-22 01:35:53,290 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:35:53,292 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 413 states [2022-11-22 01:35:53,292 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:35:53,312 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 413 interpolants. [2022-11-22 01:35:53,328 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=85537, Invalid=95513, Unknown=0, NotChecked=0, Total=181050 [2022-11-22 01:35:53,329 INFO L87 Difference]: Start difference. First operand 587 states and 654 transitions. Second operand has 413 states, 413 states have (on average 1.0653753026634383) internal successors, (440), 412 states have internal predecessors, (440), 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)