./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-examples/standard_two_index_03.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 2329fc70 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_9f90a139-ad60-49f0-ad1b-e66a0baf7184/bin/utaipan-gh47qXpMRh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f90a139-ad60-49f0-ad1b-e66a0baf7184/bin/utaipan-gh47qXpMRh/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f90a139-ad60-49f0-ad1b-e66a0baf7184/bin/utaipan-gh47qXpMRh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f90a139-ad60-49f0-ad1b-e66a0baf7184/bin/utaipan-gh47qXpMRh/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-examples/standard_two_index_03.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f90a139-ad60-49f0-ad1b-e66a0baf7184/bin/utaipan-gh47qXpMRh/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f90a139-ad60-49f0-ad1b-e66a0baf7184/bin/utaipan-gh47qXpMRh --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 52914d7c178662889d0d1af19e507e51f5067aa3fe7ebdb303f414406fa46b67 --- 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-2329fc7 [2022-12-14 15:22:10,531 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-12-14 15:22:10,533 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-12-14 15:22:10,550 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-12-14 15:22:10,550 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-12-14 15:22:10,551 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-12-14 15:22:10,552 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-12-14 15:22:10,554 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-12-14 15:22:10,555 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-12-14 15:22:10,556 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-12-14 15:22:10,557 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-12-14 15:22:10,558 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-12-14 15:22:10,558 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-12-14 15:22:10,559 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-12-14 15:22:10,560 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-12-14 15:22:10,561 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-12-14 15:22:10,562 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-12-14 15:22:10,563 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-12-14 15:22:10,564 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-12-14 15:22:10,565 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-12-14 15:22:10,567 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-12-14 15:22:10,568 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-12-14 15:22:10,569 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-12-14 15:22:10,570 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-12-14 15:22:10,573 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-12-14 15:22:10,573 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-12-14 15:22:10,573 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-12-14 15:22:10,574 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-12-14 15:22:10,575 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-12-14 15:22:10,575 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-12-14 15:22:10,576 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-12-14 15:22:10,576 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-12-14 15:22:10,577 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-12-14 15:22:10,578 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-12-14 15:22:10,578 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-12-14 15:22:10,579 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-12-14 15:22:10,579 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-12-14 15:22:10,579 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-12-14 15:22:10,579 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-12-14 15:22:10,580 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-12-14 15:22:10,581 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-12-14 15:22:10,581 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f90a139-ad60-49f0-ad1b-e66a0baf7184/bin/utaipan-gh47qXpMRh/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-12-14 15:22:10,600 INFO L113 SettingsManager]: Loading preferences was successful [2022-12-14 15:22:10,600 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-12-14 15:22:10,600 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-12-14 15:22:10,606 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-12-14 15:22:10,607 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-12-14 15:22:10,607 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-12-14 15:22:10,607 INFO L138 SettingsManager]: * User list type=DISABLED [2022-12-14 15:22:10,607 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-12-14 15:22:10,607 INFO L138 SettingsManager]: * Explicit value domain=true [2022-12-14 15:22:10,608 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-12-14 15:22:10,608 INFO L138 SettingsManager]: * Octagon Domain=false [2022-12-14 15:22:10,608 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-12-14 15:22:10,608 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-12-14 15:22:10,608 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-12-14 15:22:10,608 INFO L138 SettingsManager]: * Interval Domain=false [2022-12-14 15:22:10,609 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-12-14 15:22:10,609 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-12-14 15:22:10,609 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-12-14 15:22:10,610 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-12-14 15:22:10,610 INFO L138 SettingsManager]: * sizeof long=4 [2022-12-14 15:22:10,610 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-12-14 15:22:10,610 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-12-14 15:22:10,611 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-12-14 15:22:10,611 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-12-14 15:22:10,611 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-12-14 15:22:10,611 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-12-14 15:22:10,611 INFO L138 SettingsManager]: * sizeof long double=12 [2022-12-14 15:22:10,612 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-12-14 15:22:10,612 INFO L138 SettingsManager]: * Use constant arrays=true [2022-12-14 15:22:10,612 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-12-14 15:22:10,612 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-12-14 15:22:10,612 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-12-14 15:22:10,613 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 15:22:10,613 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-12-14 15:22:10,613 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-12-14 15:22:10,613 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-12-14 15:22:10,613 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-12-14 15:22:10,614 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-12-14 15:22:10,614 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-12-14 15:22:10,614 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-12-14 15:22:10,614 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-12-14 15:22:10,614 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_9f90a139-ad60-49f0-ad1b-e66a0baf7184/bin/utaipan-gh47qXpMRh/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f90a139-ad60-49f0-ad1b-e66a0baf7184/bin/utaipan-gh47qXpMRh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 52914d7c178662889d0d1af19e507e51f5067aa3fe7ebdb303f414406fa46b67 [2022-12-14 15:22:10,790 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-12-14 15:22:10,809 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-12-14 15:22:10,812 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-12-14 15:22:10,813 INFO L271 PluginConnector]: Initializing CDTParser... [2022-12-14 15:22:10,813 INFO L275 PluginConnector]: CDTParser initialized [2022-12-14 15:22:10,814 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f90a139-ad60-49f0-ad1b-e66a0baf7184/bin/utaipan-gh47qXpMRh/../../sv-benchmarks/c/array-examples/standard_two_index_03.i [2022-12-14 15:22:13,392 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-12-14 15:22:13,529 INFO L351 CDTParser]: Found 1 translation units. [2022-12-14 15:22:13,529 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f90a139-ad60-49f0-ad1b-e66a0baf7184/sv-benchmarks/c/array-examples/standard_two_index_03.i [2022-12-14 15:22:13,533 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f90a139-ad60-49f0-ad1b-e66a0baf7184/bin/utaipan-gh47qXpMRh/data/59c8a04ce/71a72554a0de4efa9be1dad0b92078bd/FLAGb73496503 [2022-12-14 15:22:13,543 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f90a139-ad60-49f0-ad1b-e66a0baf7184/bin/utaipan-gh47qXpMRh/data/59c8a04ce/71a72554a0de4efa9be1dad0b92078bd [2022-12-14 15:22:13,545 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-12-14 15:22:13,546 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-12-14 15:22:13,546 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-12-14 15:22:13,547 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-12-14 15:22:13,549 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-12-14 15:22:13,549 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 03:22:13" (1/1) ... [2022-12-14 15:22:13,550 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@11fa2f9f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:22:13, skipping insertion in model container [2022-12-14 15:22:13,550 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 03:22:13" (1/1) ... [2022-12-14 15:22:13,556 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-12-14 15:22:13,566 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-12-14 15:22:13,664 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_9f90a139-ad60-49f0-ad1b-e66a0baf7184/sv-benchmarks/c/array-examples/standard_two_index_03.i[814,827] [2022-12-14 15:22:13,674 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 15:22:13,681 INFO L203 MainTranslator]: Completed pre-run [2022-12-14 15:22:13,689 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_9f90a139-ad60-49f0-ad1b-e66a0baf7184/sv-benchmarks/c/array-examples/standard_two_index_03.i[814,827] [2022-12-14 15:22:13,694 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 15:22:13,705 INFO L208 MainTranslator]: Completed translation [2022-12-14 15:22:13,705 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:22:13 WrapperNode [2022-12-14 15:22:13,705 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-12-14 15:22:13,706 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-12-14 15:22:13,706 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-12-14 15:22:13,706 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-12-14 15:22:13,711 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:22:13" (1/1) ... [2022-12-14 15:22:13,716 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:22:13" (1/1) ... [2022-12-14 15:22:13,728 INFO L138 Inliner]: procedures = 16, calls = 18, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 59 [2022-12-14 15:22:13,728 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-12-14 15:22:13,729 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-12-14 15:22:13,729 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-12-14 15:22:13,729 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-12-14 15:22:13,736 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:22:13" (1/1) ... [2022-12-14 15:22:13,736 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:22:13" (1/1) ... [2022-12-14 15:22:13,737 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:22:13" (1/1) ... [2022-12-14 15:22:13,737 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:22:13" (1/1) ... [2022-12-14 15:22:13,740 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:22:13" (1/1) ... [2022-12-14 15:22:13,742 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:22:13" (1/1) ... [2022-12-14 15:22:13,743 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:22:13" (1/1) ... [2022-12-14 15:22:13,744 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:22:13" (1/1) ... [2022-12-14 15:22:13,745 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-12-14 15:22:13,745 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-12-14 15:22:13,745 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-12-14 15:22:13,745 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-12-14 15:22:13,746 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:22:13" (1/1) ... [2022-12-14 15:22:13,750 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 15:22:13,759 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f90a139-ad60-49f0-ad1b-e66a0baf7184/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:22:13,770 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f90a139-ad60-49f0-ad1b-e66a0baf7184/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-12-14 15:22:13,772 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f90a139-ad60-49f0-ad1b-e66a0baf7184/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-12-14 15:22:13,798 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-12-14 15:22:13,798 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-12-14 15:22:13,798 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-12-14 15:22:13,799 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-12-14 15:22:13,799 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-12-14 15:22:13,799 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-12-14 15:22:13,799 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-12-14 15:22:13,799 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-12-14 15:22:13,853 INFO L235 CfgBuilder]: Building ICFG [2022-12-14 15:22:13,854 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-12-14 15:22:13,937 INFO L276 CfgBuilder]: Performing block encoding [2022-12-14 15:22:13,954 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-12-14 15:22:13,955 INFO L300 CfgBuilder]: Removed 3 assume(true) statements. [2022-12-14 15:22:13,956 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 03:22:13 BoogieIcfgContainer [2022-12-14 15:22:13,956 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-12-14 15:22:13,958 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-12-14 15:22:13,958 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-12-14 15:22:13,960 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-12-14 15:22:13,961 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.12 03:22:13" (1/3) ... [2022-12-14 15:22:13,961 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5af83dd1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 03:22:13, skipping insertion in model container [2022-12-14 15:22:13,961 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:22:13" (2/3) ... [2022-12-14 15:22:13,962 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5af83dd1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 03:22:13, skipping insertion in model container [2022-12-14 15:22:13,962 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 03:22:13" (3/3) ... [2022-12-14 15:22:13,963 INFO L112 eAbstractionObserver]: Analyzing ICFG standard_two_index_03.i [2022-12-14 15:22:13,976 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-12-14 15:22:13,976 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-12-14 15:22:14,009 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-12-14 15:22:14,013 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;@526a8b68, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-12-14 15:22:14,014 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-12-14 15:22:14,017 INFO L276 IsEmpty]: Start isEmpty. Operand has 9 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 8 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:22:14,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-12-14 15:22:14,021 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:22:14,021 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-12-14 15:22:14,021 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:22:14,025 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:22:14,025 INFO L85 PathProgramCache]: Analyzing trace with hash -1745982706, now seen corresponding path program 1 times [2022-12-14 15:22:14,032 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:22:14,032 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [739030077] [2022-12-14 15:22:14,032 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:22:14,033 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:22:14,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:22:14,172 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 15:22:14,173 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:22:14,173 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [739030077] [2022-12-14 15:22:14,173 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [739030077] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 15:22:14,174 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 15:22:14,174 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-12-14 15:22:14,175 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2033197498] [2022-12-14 15:22:14,175 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 15:22:14,178 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-12-14 15:22:14,179 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:22:14,199 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-12-14 15:22:14,200 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 15:22:14,201 INFO L87 Difference]: Start difference. First operand has 9 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 8 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:22:14,230 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:22:14,230 INFO L93 Difference]: Finished difference Result 17 states and 23 transitions. [2022-12-14 15:22:14,231 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-12-14 15:22:14,232 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2022-12-14 15:22:14,232 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:22:14,237 INFO L225 Difference]: With dead ends: 17 [2022-12-14 15:22:14,237 INFO L226 Difference]: Without dead ends: 9 [2022-12-14 15:22:14,239 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 [2022-12-14 15:22:14,241 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 0 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 12 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 15:22:14,242 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 9 Invalid, 12 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 15:22:14,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2022-12-14 15:22:14,262 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2022-12-14 15:22:14,263 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9 states, 8 states have (on average 1.375) internal successors, (11), 8 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:22:14,263 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 11 transitions. [2022-12-14 15:22:14,264 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 11 transitions. Word has length 6 [2022-12-14 15:22:14,264 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:22:14,265 INFO L495 AbstractCegarLoop]: Abstraction has 9 states and 11 transitions. [2022-12-14 15:22:14,265 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:22:14,265 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 11 transitions. [2022-12-14 15:22:14,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-12-14 15:22:14,265 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:22:14,265 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:22:14,265 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-12-14 15:22:14,266 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:22:14,266 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:22:14,266 INFO L85 PathProgramCache]: Analyzing trace with hash 276578033, now seen corresponding path program 1 times [2022-12-14 15:22:14,266 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:22:14,266 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1288592031] [2022-12-14 15:22:14,267 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:22:14,267 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:22:14,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:22:14,329 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 15:22:14,329 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:22:14,329 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1288592031] [2022-12-14 15:22:14,329 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1288592031] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:22:14,329 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [786455848] [2022-12-14 15:22:14,330 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:22:14,330 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:22:14,330 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f90a139-ad60-49f0-ad1b-e66a0baf7184/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:22:14,331 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f90a139-ad60-49f0-ad1b-e66a0baf7184/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:22:14,332 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f90a139-ad60-49f0-ad1b-e66a0baf7184/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-12-14 15:22:14,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:22:14,398 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 2 conjunts are in the unsatisfiable core [2022-12-14 15:22:14,400 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:22:14,410 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 15:22:14,410 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-12-14 15:22:14,410 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [786455848] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 15:22:14,411 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-12-14 15:22:14,411 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3] total 4 [2022-12-14 15:22:14,411 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [128604731] [2022-12-14 15:22:14,411 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 15:22:14,412 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-12-14 15:22:14,412 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:22:14,412 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-12-14 15:22:14,412 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-12-14 15:22:14,413 INFO L87 Difference]: Start difference. First operand 9 states and 11 transitions. Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:22:14,429 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:22:14,429 INFO L93 Difference]: Finished difference Result 20 states and 23 transitions. [2022-12-14 15:22:14,429 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-12-14 15:22:14,430 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2022-12-14 15:22:14,430 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:22:14,430 INFO L225 Difference]: With dead ends: 20 [2022-12-14 15:22:14,430 INFO L226 Difference]: Without dead ends: 15 [2022-12-14 15:22:14,430 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-12-14 15:22:14,431 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 4 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 15:22:14,431 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 6 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 15:22:14,432 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2022-12-14 15:22:14,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 10. [2022-12-14 15:22:14,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 9 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:22:14,434 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 12 transitions. [2022-12-14 15:22:14,434 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 12 transitions. Word has length 7 [2022-12-14 15:22:14,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:22:14,434 INFO L495 AbstractCegarLoop]: Abstraction has 10 states and 12 transitions. [2022-12-14 15:22:14,434 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:22:14,434 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 12 transitions. [2022-12-14 15:22:14,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-12-14 15:22:14,434 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:22:14,435 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:22:14,440 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f90a139-ad60-49f0-ad1b-e66a0baf7184/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-12-14 15:22:14,635 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f90a139-ad60-49f0-ad1b-e66a0baf7184/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:22:14,637 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:22:14,638 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:22:14,639 INFO L85 PathProgramCache]: Analyzing trace with hash -51261225, now seen corresponding path program 1 times [2022-12-14 15:22:14,639 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:22:14,640 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1793937136] [2022-12-14 15:22:14,640 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:22:14,641 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:22:14,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:22:14,809 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 15:22:14,809 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:22:14,810 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1793937136] [2022-12-14 15:22:14,810 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1793937136] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:22:14,810 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1418674440] [2022-12-14 15:22:14,810 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:22:14,810 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:22:14,811 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f90a139-ad60-49f0-ad1b-e66a0baf7184/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:22:14,812 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f90a139-ad60-49f0-ad1b-e66a0baf7184/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:22:14,813 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f90a139-ad60-49f0-ad1b-e66a0baf7184/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-12-14 15:22:14,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:22:14,861 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 3 conjunts are in the unsatisfiable core [2022-12-14 15:22:14,862 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:22:14,885 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 15:22:14,885 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:22:14,901 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 15:22:14,901 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1418674440] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:22:14,902 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1732397216] [2022-12-14 15:22:14,916 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 15:22:14,916 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:22:14,918 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:22:14,922 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:22:14,923 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:22:14,972 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:22:14,973 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:22:15,012 INFO L321 Elim1Store]: treesize reduction 37, result has 32.7 percent of original size [2022-12-14 15:22:15,013 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 34 [2022-12-14 15:22:15,033 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:22:15,035 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:22:15,066 INFO L321 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2022-12-14 15:22:15,066 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2022-12-14 15:22:15,113 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:22:15,115 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-12-14 15:22:15,235 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:22:15,237 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 15:22:15,257 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 15:22:15,257 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 248 treesize of output 247 [2022-12-14 15:22:15,389 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 [2022-12-14 15:22:15,406 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:22:15,406 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 17 treesize of output 17 [2022-12-14 15:22:15,441 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:22:15,442 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:22:15,478 INFO L321 Elim1Store]: treesize reduction 95, result has 34.0 percent of original size [2022-12-14 15:22:15,478 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 6 case distinctions, treesize of input 78 treesize of output 103 [2022-12-14 15:22:15,559 INFO L321 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2022-12-14 15:22:15,560 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 25 treesize of output 25 [2022-12-14 15:22:15,575 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:22:15,680 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '164#(and (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (= |ULTIMATE.start_main_~#b~0#1.offset| 0) (= |ULTIMATE.start_main_~i~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (ite (= |ULTIMATE.start_main_#t~mem4#1| |ULTIMATE.start_main_#t~mem3#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start_main_#t~mem3#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~j~0#1| 4)))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_~j~0#1| 0) (<= 0 |ULTIMATE.start_main_~#b~0#1.base|) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#b~0#1.base|) (+ |ULTIMATE.start_main_~#b~0#1.offset| (* |ULTIMATE.start_main_~j~0#1| 12) 4)) |ULTIMATE.start_main_#t~mem4#1|) (= |#NULL.base| 0))' at error location [2022-12-14 15:22:15,680 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:22:15,680 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:22:15,680 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2022-12-14 15:22:15,681 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [512123277] [2022-12-14 15:22:15,681 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:22:15,681 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-12-14 15:22:15,681 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:22:15,681 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-12-14 15:22:15,682 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=83, Unknown=0, NotChecked=0, Total=132 [2022-12-14 15:22:15,682 INFO L87 Difference]: Start difference. First operand 10 states and 12 transitions. Second operand has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:22:15,708 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:22:15,708 INFO L93 Difference]: Finished difference Result 31 states and 38 transitions. [2022-12-14 15:22:15,709 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-12-14 15:22:15,709 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2022-12-14 15:22:15,709 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:22:15,710 INFO L225 Difference]: With dead ends: 31 [2022-12-14 15:22:15,710 INFO L226 Difference]: Without dead ends: 24 [2022-12-14 15:22:15,710 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=83, Unknown=0, NotChecked=0, Total=132 [2022-12-14 15:22:15,711 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 15 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 31 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 15:22:15,712 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 12 Invalid, 31 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 15:22:15,712 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2022-12-14 15:22:15,714 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 14. [2022-12-14 15:22:15,715 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 13 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:22:15,715 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2022-12-14 15:22:15,715 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 8 [2022-12-14 15:22:15,715 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:22:15,716 INFO L495 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2022-12-14 15:22:15,716 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:22:15,716 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2022-12-14 15:22:15,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-12-14 15:22:15,716 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:22:15,716 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1] [2022-12-14 15:22:15,721 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f90a139-ad60-49f0-ad1b-e66a0baf7184/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2022-12-14 15:22:15,917 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f90a139-ad60-49f0-ad1b-e66a0baf7184/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:22:15,918 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:22:15,920 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:22:15,920 INFO L85 PathProgramCache]: Analyzing trace with hash 490227022, now seen corresponding path program 2 times [2022-12-14 15:22:15,921 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:22:15,921 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1174379699] [2022-12-14 15:22:15,921 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:22:15,922 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:22:15,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:22:16,107 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-12-14 15:22:16,107 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:22:16,107 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1174379699] [2022-12-14 15:22:16,108 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1174379699] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:22:16,108 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1329683451] [2022-12-14 15:22:16,108 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 15:22:16,108 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:22:16,108 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f90a139-ad60-49f0-ad1b-e66a0baf7184/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:22:16,109 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f90a139-ad60-49f0-ad1b-e66a0baf7184/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:22:16,110 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f90a139-ad60-49f0-ad1b-e66a0baf7184/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-12-14 15:22:16,157 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-12-14 15:22:16,157 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:22:16,158 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 4 conjunts are in the unsatisfiable core [2022-12-14 15:22:16,159 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:22:16,169 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-12-14 15:22:16,169 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:22:16,189 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-12-14 15:22:16,190 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1329683451] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:22:16,190 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1916597237] [2022-12-14 15:22:16,192 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 15:22:16,192 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:22:16,192 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:22:16,193 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:22:16,193 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:22:16,206 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:22:16,207 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:22:16,232 INFO L321 Elim1Store]: treesize reduction 37, result has 32.7 percent of original size [2022-12-14 15:22:16,232 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 34 [2022-12-14 15:22:16,244 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:22:16,246 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:22:16,273 INFO L321 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2022-12-14 15:22:16,274 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2022-12-14 15:22:16,300 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:22:16,301 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-12-14 15:22:16,370 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:22:16,371 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 15:22:16,392 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 15:22:16,393 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 248 treesize of output 247 [2022-12-14 15:22:16,497 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 [2022-12-14 15:22:16,509 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:22:16,509 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 20 treesize of output 20 [2022-12-14 15:22:16,534 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:22:16,578 INFO L321 Elim1Store]: treesize reduction 109, result has 33.5 percent of original size [2022-12-14 15:22:16,579 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 5 case distinctions, treesize of input 81 treesize of output 109 [2022-12-14 15:22:16,632 INFO L321 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2022-12-14 15:22:16,632 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 25 treesize of output 25 [2022-12-14 15:22:16,641 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:22:16,729 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '312#(and (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (= |ULTIMATE.start_main_~#b~0#1.offset| 0) (= |ULTIMATE.start_main_~i~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (ite (= |ULTIMATE.start_main_#t~mem4#1| |ULTIMATE.start_main_#t~mem3#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start_main_#t~mem3#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~j~0#1| 4)))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_~j~0#1| 0) (<= 0 |ULTIMATE.start_main_~#b~0#1.base|) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#b~0#1.base|) (+ |ULTIMATE.start_main_~#b~0#1.offset| (* |ULTIMATE.start_main_~j~0#1| 12) 4)) |ULTIMATE.start_main_#t~mem4#1|) (= |#NULL.base| 0))' at error location [2022-12-14 15:22:16,730 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:22:16,730 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:22:16,730 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2022-12-14 15:22:16,730 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [108412698] [2022-12-14 15:22:16,730 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:22:16,730 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-12-14 15:22:16,730 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:22:16,731 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-12-14 15:22:16,731 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=106, Unknown=0, NotChecked=0, Total=182 [2022-12-14 15:22:16,731 INFO L87 Difference]: Start difference. First operand 14 states and 16 transitions. Second operand has 9 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 9 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:22:16,769 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:22:16,769 INFO L93 Difference]: Finished difference Result 54 states and 63 transitions. [2022-12-14 15:22:16,770 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-12-14 15:22:16,770 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 9 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2022-12-14 15:22:16,770 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:22:16,771 INFO L225 Difference]: With dead ends: 54 [2022-12-14 15:22:16,771 INFO L226 Difference]: Without dead ends: 46 [2022-12-14 15:22:16,771 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=76, Invalid=106, Unknown=0, NotChecked=0, Total=182 [2022-12-14 15:22:16,772 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 44 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 56 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 15:22:16,773 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [44 Valid, 18 Invalid, 56 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 15:22:16,774 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2022-12-14 15:22:16,777 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 20. [2022-12-14 15:22:16,777 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 19 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:22:16,778 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2022-12-14 15:22:16,778 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 12 [2022-12-14 15:22:16,778 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:22:16,778 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2022-12-14 15:22:16,778 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 9 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:22:16,778 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2022-12-14 15:22:16,779 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-12-14 15:22:16,779 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:22:16,779 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1] [2022-12-14 15:22:16,784 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f90a139-ad60-49f0-ad1b-e66a0baf7184/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2022-12-14 15:22:16,979 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f90a139-ad60-49f0-ad1b-e66a0baf7184/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:22:16,980 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:22:16,981 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:22:16,982 INFO L85 PathProgramCache]: Analyzing trace with hash 1077845166, now seen corresponding path program 3 times [2022-12-14 15:22:16,982 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:22:16,982 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [450429681] [2022-12-14 15:22:16,982 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:22:16,983 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:22:17,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:22:17,223 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-12-14 15:22:17,223 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:22:17,223 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [450429681] [2022-12-14 15:22:17,223 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [450429681] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:22:17,223 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1689293669] [2022-12-14 15:22:17,224 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 15:22:17,224 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:22:17,224 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f90a139-ad60-49f0-ad1b-e66a0baf7184/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:22:17,225 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f90a139-ad60-49f0-ad1b-e66a0baf7184/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:22:17,226 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f90a139-ad60-49f0-ad1b-e66a0baf7184/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-12-14 15:22:17,289 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 15:22:17,289 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:22:17,290 INFO L263 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 8 conjunts are in the unsatisfiable core [2022-12-14 15:22:17,291 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:22:17,323 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-12-14 15:22:17,324 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:22:17,388 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-12-14 15:22:17,388 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1689293669] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:22:17,389 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [563985713] [2022-12-14 15:22:17,391 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 15:22:17,391 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:22:17,391 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:22:17,391 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:22:17,391 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:22:17,402 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:22:17,403 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:22:17,430 INFO L321 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2022-12-14 15:22:17,430 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2022-12-14 15:22:17,440 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:22:17,441 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:22:17,442 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 27 [2022-12-14 15:22:17,459 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:22:17,460 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 15:22:17,501 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:22:17,503 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:22:17,514 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 15:22:17,514 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 258 treesize of output 246 [2022-12-14 15:22:17,556 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 [2022-12-14 15:22:17,567 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:22:17,568 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 25 treesize of output 25 [2022-12-14 15:22:17,614 INFO L321 Elim1Store]: treesize reduction 119, result has 26.1 percent of original size [2022-12-14 15:22:17,614 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 86 treesize of output 108 [2022-12-14 15:22:17,656 INFO L321 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2022-12-14 15:22:17,657 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 25 treesize of output 25 [2022-12-14 15:22:17,668 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:22:17,780 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '555#(and (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (= |ULTIMATE.start_main_~#b~0#1.offset| 0) (= |ULTIMATE.start_main_~i~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (ite (= |ULTIMATE.start_main_#t~mem4#1| |ULTIMATE.start_main_#t~mem3#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start_main_#t~mem3#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~j~0#1| 4)))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_~j~0#1| 0) (<= 0 |ULTIMATE.start_main_~#b~0#1.base|) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#b~0#1.base|) (+ |ULTIMATE.start_main_~#b~0#1.offset| (* |ULTIMATE.start_main_~j~0#1| 12) 4)) |ULTIMATE.start_main_#t~mem4#1|) (= |#NULL.base| 0))' at error location [2022-12-14 15:22:17,780 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:22:17,780 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:22:17,780 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 22 [2022-12-14 15:22:17,780 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1616010858] [2022-12-14 15:22:17,780 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:22:17,781 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-12-14 15:22:17,781 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:22:17,781 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-12-14 15:22:17,782 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=306, Invalid=396, Unknown=0, NotChecked=0, Total=702 [2022-12-14 15:22:17,782 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand has 22 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 22 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:22:17,883 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:22:17,883 INFO L93 Difference]: Finished difference Result 95 states and 115 transitions. [2022-12-14 15:22:17,883 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-12-14 15:22:17,883 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 22 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2022-12-14 15:22:17,884 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:22:17,884 INFO L225 Difference]: With dead ends: 95 [2022-12-14 15:22:17,884 INFO L226 Difference]: Without dead ends: 83 [2022-12-14 15:22:17,885 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 327 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=306, Invalid=396, Unknown=0, NotChecked=0, Total=702 [2022-12-14 15:22:17,885 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 84 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 78 mSolverCounterSat, 40 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 84 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 118 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 78 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 15:22:17,885 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [84 Valid, 51 Invalid, 118 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 78 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 15:22:17,886 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2022-12-14 15:22:17,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 37. [2022-12-14 15:22:17,889 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 36 states have (on average 1.0833333333333333) internal successors, (39), 36 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:22:17,889 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 39 transitions. [2022-12-14 15:22:17,889 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 39 transitions. Word has length 18 [2022-12-14 15:22:17,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:22:17,890 INFO L495 AbstractCegarLoop]: Abstraction has 37 states and 39 transitions. [2022-12-14 15:22:17,890 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 22 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:22:17,890 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 39 transitions. [2022-12-14 15:22:17,891 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-12-14 15:22:17,891 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:22:17,891 INFO L195 NwaCegarLoop]: trace histogram [19, 10, 1, 1, 1, 1, 1, 1] [2022-12-14 15:22:17,896 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f90a139-ad60-49f0-ad1b-e66a0baf7184/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2022-12-14 15:22:18,092 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f90a139-ad60-49f0-ad1b-e66a0baf7184/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:22:18,092 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:22:18,093 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:22:18,093 INFO L85 PathProgramCache]: Analyzing trace with hash 579941201, now seen corresponding path program 4 times [2022-12-14 15:22:18,093 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:22:18,093 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1711667453] [2022-12-14 15:22:18,093 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:22:18,093 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:22:18,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:22:18,365 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2022-12-14 15:22:18,366 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:22:18,366 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1711667453] [2022-12-14 15:22:18,366 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1711667453] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:22:18,366 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2113322084] [2022-12-14 15:22:18,366 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 15:22:18,366 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:22:18,366 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f90a139-ad60-49f0-ad1b-e66a0baf7184/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:22:18,367 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f90a139-ad60-49f0-ad1b-e66a0baf7184/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:22:18,368 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f90a139-ad60-49f0-ad1b-e66a0baf7184/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-12-14 15:22:18,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:22:18,449 INFO L263 TraceCheckSpWp]: Trace formula consists of 330 conjuncts, 21 conjunts are in the unsatisfiable core [2022-12-14 15:22:18,451 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:22:18,548 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-12-14 15:22:18,548 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:22:18,861 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-12-14 15:22:18,861 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2113322084] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:22:18,861 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1741813082] [2022-12-14 15:22:18,863 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 15:22:18,863 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:22:18,863 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:22:18,864 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:22:18,864 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:22:18,874 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:22:18,875 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:22:18,899 INFO L321 Elim1Store]: treesize reduction 37, result has 32.7 percent of original size [2022-12-14 15:22:18,899 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 34 [2022-12-14 15:22:18,909 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:22:18,910 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:22:18,938 INFO L321 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2022-12-14 15:22:18,938 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2022-12-14 15:22:18,958 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:22:18,958 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 15:22:18,996 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:22:18,998 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:22:19,008 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 15:22:19,009 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 258 treesize of output 246 [2022-12-14 15:22:19,053 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 [2022-12-14 15:22:19,063 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:22:19,063 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 17 treesize of output 17 [2022-12-14 15:22:19,082 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:22:19,083 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:22:19,121 INFO L321 Elim1Store]: treesize reduction 95, result has 34.0 percent of original size [2022-12-14 15:22:19,121 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 6 case distinctions, treesize of input 78 treesize of output 103 [2022-12-14 15:22:19,172 INFO L321 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2022-12-14 15:22:19,172 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 25 treesize of output 25 [2022-12-14 15:22:19,182 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:22:19,293 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1025#(and (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (= |ULTIMATE.start_main_~#b~0#1.offset| 0) (= |ULTIMATE.start_main_~i~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (ite (= |ULTIMATE.start_main_#t~mem4#1| |ULTIMATE.start_main_#t~mem3#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start_main_#t~mem3#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~j~0#1| 4)))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_~j~0#1| 0) (<= 0 |ULTIMATE.start_main_~#b~0#1.base|) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#b~0#1.base|) (+ |ULTIMATE.start_main_~#b~0#1.offset| (* |ULTIMATE.start_main_~j~0#1| 12) 4)) |ULTIMATE.start_main_#t~mem4#1|) (= |#NULL.base| 0))' at error location [2022-12-14 15:22:19,293 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:22:19,294 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:22:19,294 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21, 21] total 47 [2022-12-14 15:22:19,294 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1660295287] [2022-12-14 15:22:19,294 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:22:19,295 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2022-12-14 15:22:19,295 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:22:19,296 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2022-12-14 15:22:19,298 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1231, Invalid=1421, Unknown=0, NotChecked=0, Total=2652 [2022-12-14 15:22:19,298 INFO L87 Difference]: Start difference. First operand 37 states and 39 transitions. Second operand has 47 states, 47 states have (on average 1.297872340425532) internal successors, (61), 47 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:22:19,484 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:22:19,484 INFO L93 Difference]: Finished difference Result 176 states and 212 transitions. [2022-12-14 15:22:19,484 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2022-12-14 15:22:19,485 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 1.297872340425532) internal successors, (61), 47 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 35 [2022-12-14 15:22:19,485 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:22:19,486 INFO L225 Difference]: With dead ends: 176 [2022-12-14 15:22:19,486 INFO L226 Difference]: Without dead ends: 160 [2022-12-14 15:22:19,488 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 66 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1325 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=1231, Invalid=1421, Unknown=0, NotChecked=0, Total=2652 [2022-12-14 15:22:19,489 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 299 mSDsluCounter, 84 mSDsCounter, 0 mSdLazyCounter, 137 mSolverCounterSat, 116 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 299 SdHoareTripleChecker+Valid, 87 SdHoareTripleChecker+Invalid, 253 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 116 IncrementalHoareTripleChecker+Valid, 137 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 15:22:19,489 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [299 Valid, 87 Invalid, 253 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [116 Valid, 137 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 15:22:19,489 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2022-12-14 15:22:19,494 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 70. [2022-12-14 15:22:19,494 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 69 states have (on average 1.0434782608695652) internal successors, (72), 69 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:22:19,494 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 72 transitions. [2022-12-14 15:22:19,494 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 72 transitions. Word has length 35 [2022-12-14 15:22:19,495 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:22:19,495 INFO L495 AbstractCegarLoop]: Abstraction has 70 states and 72 transitions. [2022-12-14 15:22:19,495 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 1.297872340425532) internal successors, (61), 47 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:22:19,495 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 72 transitions. [2022-12-14 15:22:19,496 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2022-12-14 15:22:19,496 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:22:19,496 INFO L195 NwaCegarLoop]: trace histogram [44, 18, 1, 1, 1, 1, 1, 1] [2022-12-14 15:22:19,501 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f90a139-ad60-49f0-ad1b-e66a0baf7184/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2022-12-14 15:22:19,696 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f90a139-ad60-49f0-ad1b-e66a0baf7184/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:22:19,697 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:22:19,698 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:22:19,698 INFO L85 PathProgramCache]: Analyzing trace with hash 583456974, now seen corresponding path program 5 times [2022-12-14 15:22:19,698 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:22:19,699 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1211211344] [2022-12-14 15:22:19,699 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:22:19,699 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:22:19,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:22:20,358 INFO L134 CoverageAnalysis]: Checked inductivity of 1161 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 990 trivial. 0 not checked. [2022-12-14 15:22:20,358 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:22:20,358 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1211211344] [2022-12-14 15:22:20,358 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1211211344] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:22:20,358 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [17413960] [2022-12-14 15:22:20,358 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 15:22:20,358 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:22:20,359 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f90a139-ad60-49f0-ad1b-e66a0baf7184/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:22:20,359 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f90a139-ad60-49f0-ad1b-e66a0baf7184/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:22:20,360 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f90a139-ad60-49f0-ad1b-e66a0baf7184/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-12-14 15:22:25,081 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2022-12-14 15:22:25,081 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:22:25,088 INFO L263 TraceCheckSpWp]: Trace formula consists of 393 conjuncts, 20 conjunts are in the unsatisfiable core [2022-12-14 15:22:25,089 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:22:25,116 INFO L134 CoverageAnalysis]: Checked inductivity of 1161 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 990 trivial. 0 not checked. [2022-12-14 15:22:25,116 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:22:25,472 INFO L134 CoverageAnalysis]: Checked inductivity of 1161 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 990 trivial. 0 not checked. [2022-12-14 15:22:25,472 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [17413960] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:22:25,473 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1220189522] [2022-12-14 15:22:25,474 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 15:22:25,474 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:22:25,474 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:22:25,474 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:22:25,474 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:22:25,481 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:22:25,481 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:22:25,501 INFO L321 Elim1Store]: treesize reduction 37, result has 32.7 percent of original size [2022-12-14 15:22:25,501 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 34 [2022-12-14 15:22:25,508 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:22:25,509 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:22:25,528 INFO L321 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2022-12-14 15:22:25,529 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2022-12-14 15:22:25,544 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:22:25,545 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 15:22:25,584 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:22:25,586 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:22:25,594 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 15:22:25,594 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 258 treesize of output 246 [2022-12-14 15:22:25,643 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 [2022-12-14 15:22:25,654 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:22:25,655 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 20 treesize of output 20 [2022-12-14 15:22:25,676 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:22:25,705 INFO L321 Elim1Store]: treesize reduction 109, result has 33.5 percent of original size [2022-12-14 15:22:25,706 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 5 case distinctions, treesize of input 81 treesize of output 109 [2022-12-14 15:22:25,759 INFO L321 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2022-12-14 15:22:25,759 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 25 treesize of output 25 [2022-12-14 15:22:25,769 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:22:25,853 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1879#(and (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (= |ULTIMATE.start_main_~#b~0#1.offset| 0) (= |ULTIMATE.start_main_~i~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (ite (= |ULTIMATE.start_main_#t~mem4#1| |ULTIMATE.start_main_#t~mem3#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start_main_#t~mem3#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~j~0#1| 4)))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_~j~0#1| 0) (<= 0 |ULTIMATE.start_main_~#b~0#1.base|) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#b~0#1.base|) (+ |ULTIMATE.start_main_~#b~0#1.offset| (* |ULTIMATE.start_main_~j~0#1| 12) 4)) |ULTIMATE.start_main_#t~mem4#1|) (= |#NULL.base| 0))' at error location [2022-12-14 15:22:25,854 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:22:25,854 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:22:25,854 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 41 [2022-12-14 15:22:25,854 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [444223190] [2022-12-14 15:22:25,854 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:22:25,855 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2022-12-14 15:22:25,855 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:22:25,856 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2022-12-14 15:22:25,856 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=956, Invalid=1114, Unknown=0, NotChecked=0, Total=2070 [2022-12-14 15:22:25,857 INFO L87 Difference]: Start difference. First operand 70 states and 72 transitions. Second operand has 41 states, 41 states have (on average 1.146341463414634) internal successors, (47), 41 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:22:26,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:22:26,112 INFO L93 Difference]: Finished difference Result 281 states and 303 transitions. [2022-12-14 15:22:26,112 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2022-12-14 15:22:26,112 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.146341463414634) internal successors, (47), 41 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 68 [2022-12-14 15:22:26,113 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:22:26,113 INFO L225 Difference]: With dead ends: 281 [2022-12-14 15:22:26,113 INFO L226 Difference]: Without dead ends: 276 [2022-12-14 15:22:26,114 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 223 GetRequests, 179 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 416 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=956, Invalid=1114, Unknown=0, NotChecked=0, Total=2070 [2022-12-14 15:22:26,114 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 392 mSDsluCounter, 111 mSDsCounter, 0 mSdLazyCounter, 159 mSolverCounterSat, 197 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 392 SdHoareTripleChecker+Valid, 114 SdHoareTripleChecker+Invalid, 356 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 197 IncrementalHoareTripleChecker+Valid, 159 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 15:22:26,114 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [392 Valid, 114 Invalid, 356 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [197 Valid, 159 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 15:22:26,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 276 states. [2022-12-14 15:22:26,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 276 to 90. [2022-12-14 15:22:26,126 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 89 states have (on average 1.0337078651685394) internal successors, (92), 89 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:22:26,126 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 92 transitions. [2022-12-14 15:22:26,126 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 92 transitions. Word has length 68 [2022-12-14 15:22:26,127 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:22:26,127 INFO L495 AbstractCegarLoop]: Abstraction has 90 states and 92 transitions. [2022-12-14 15:22:26,127 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 1.146341463414634) internal successors, (47), 41 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:22:26,127 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 92 transitions. [2022-12-14 15:22:26,128 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2022-12-14 15:22:26,128 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:22:26,128 INFO L195 NwaCegarLoop]: trace histogram [44, 38, 1, 1, 1, 1, 1, 1] [2022-12-14 15:22:26,136 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f90a139-ad60-49f0-ad1b-e66a0baf7184/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2022-12-14 15:22:26,329 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f90a139-ad60-49f0-ad1b-e66a0baf7184/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:22:26,330 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:22:26,331 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:22:26,332 INFO L85 PathProgramCache]: Analyzing trace with hash 850278350, now seen corresponding path program 6 times [2022-12-14 15:22:26,332 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:22:26,333 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2071251174] [2022-12-14 15:22:26,333 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:22:26,333 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:22:26,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:22:27,350 INFO L134 CoverageAnalysis]: Checked inductivity of 1731 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 990 trivial. 0 not checked. [2022-12-14 15:22:27,351 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:22:27,351 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2071251174] [2022-12-14 15:22:27,351 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2071251174] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:22:27,351 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [28656719] [2022-12-14 15:22:27,351 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 15:22:27,351 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:22:27,351 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f90a139-ad60-49f0-ad1b-e66a0baf7184/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:22:27,352 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f90a139-ad60-49f0-ad1b-e66a0baf7184/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:22:27,353 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f90a139-ad60-49f0-ad1b-e66a0baf7184/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-12-14 15:22:27,496 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 15:22:27,496 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:22:27,499 INFO L263 TraceCheckSpWp]: Trace formula consists of 807 conjuncts, 46 conjunts are in the unsatisfiable core [2022-12-14 15:22:27,503 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:22:27,712 INFO L134 CoverageAnalysis]: Checked inductivity of 1731 backedges. 0 proven. 990 refuted. 0 times theorem prover too weak. 741 trivial. 0 not checked. [2022-12-14 15:22:27,712 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:22:29,231 INFO L134 CoverageAnalysis]: Checked inductivity of 1731 backedges. 0 proven. 990 refuted. 0 times theorem prover too weak. 741 trivial. 0 not checked. [2022-12-14 15:22:29,231 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [28656719] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:22:29,231 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [940664210] [2022-12-14 15:22:29,233 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 15:22:29,233 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:22:29,233 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:22:29,233 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:22:29,233 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:22:29,242 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:22:29,243 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:22:29,260 INFO L321 Elim1Store]: treesize reduction 37, result has 32.7 percent of original size [2022-12-14 15:22:29,261 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 34 [2022-12-14 15:22:29,270 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:22:29,272 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:22:29,296 INFO L321 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2022-12-14 15:22:29,296 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2022-12-14 15:22:29,312 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:22:29,313 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-12-14 15:22:29,351 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:22:29,352 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 15:22:29,367 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 15:22:29,367 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 248 treesize of output 247 [2022-12-14 15:22:29,443 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 [2022-12-14 15:22:29,451 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:22:29,452 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 25 treesize of output 25 [2022-12-14 15:22:29,491 INFO L321 Elim1Store]: treesize reduction 119, result has 26.1 percent of original size [2022-12-14 15:22:29,491 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 86 treesize of output 108 [2022-12-14 15:22:29,524 INFO L321 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2022-12-14 15:22:29,524 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 25 treesize of output 25 [2022-12-14 15:22:29,532 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:22:29,640 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3103#(and (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (= |ULTIMATE.start_main_~#b~0#1.offset| 0) (= |ULTIMATE.start_main_~i~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (ite (= |ULTIMATE.start_main_#t~mem4#1| |ULTIMATE.start_main_#t~mem3#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start_main_#t~mem3#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~j~0#1| 4)))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_~j~0#1| 0) (<= 0 |ULTIMATE.start_main_~#b~0#1.base|) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#b~0#1.base|) (+ |ULTIMATE.start_main_~#b~0#1.offset| (* |ULTIMATE.start_main_~j~0#1| 12) 4)) |ULTIMATE.start_main_#t~mem4#1|) (= |#NULL.base| 0))' at error location [2022-12-14 15:22:29,640 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:22:29,640 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:22:29,640 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 46, 46] total 117 [2022-12-14 15:22:29,640 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1082453832] [2022-12-14 15:22:29,640 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:22:29,641 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 117 states [2022-12-14 15:22:29,641 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:22:29,644 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 117 interpolants. [2022-12-14 15:22:29,650 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7146, Invalid=7616, Unknown=0, NotChecked=0, Total=14762 [2022-12-14 15:22:29,651 INFO L87 Difference]: Start difference. First operand 90 states and 92 transitions. Second operand has 117 states, 117 states have (on average 1.188034188034188) internal successors, (139), 117 states have internal predecessors, (139), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:22:30,872 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:22:30,872 INFO L93 Difference]: Finished difference Result 490 states and 579 transitions. [2022-12-14 15:22:30,872 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 117 states. [2022-12-14 15:22:30,872 INFO L78 Accepts]: Start accepts. Automaton has has 117 states, 117 states have (on average 1.188034188034188) internal successors, (139), 117 states have internal predecessors, (139), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 88 [2022-12-14 15:22:30,872 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:22:30,873 INFO L225 Difference]: With dead ends: 490 [2022-12-14 15:22:30,873 INFO L226 Difference]: Without dead ends: 446 [2022-12-14 15:22:30,875 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 303 GetRequests, 183 SyntacticMatches, 0 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6641 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=7146, Invalid=7616, Unknown=0, NotChecked=0, Total=14762 [2022-12-14 15:22:30,876 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 1007 mSDsluCounter, 216 mSDsCounter, 0 mSdLazyCounter, 341 mSolverCounterSat, 382 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1007 SdHoareTripleChecker+Valid, 219 SdHoareTripleChecker+Invalid, 723 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 382 IncrementalHoareTripleChecker+Valid, 341 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 15:22:30,876 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1007 Valid, 219 Invalid, 723 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [382 Valid, 341 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 15:22:30,876 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 446 states. [2022-12-14 15:22:30,884 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 446 to 176. [2022-12-14 15:22:30,885 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 176 states, 175 states have (on average 1.0171428571428571) internal successors, (178), 175 states have internal predecessors, (178), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:22:30,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 178 transitions. [2022-12-14 15:22:30,885 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 178 transitions. Word has length 88 [2022-12-14 15:22:30,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:22:30,885 INFO L495 AbstractCegarLoop]: Abstraction has 176 states and 178 transitions. [2022-12-14 15:22:30,886 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 117 states, 117 states have (on average 1.188034188034188) internal successors, (139), 117 states have internal predecessors, (139), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:22:30,886 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 178 transitions. [2022-12-14 15:22:30,887 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 175 [2022-12-14 15:22:30,887 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:22:30,887 INFO L195 NwaCegarLoop]: trace histogram [114, 54, 1, 1, 1, 1, 1, 1] [2022-12-14 15:22:30,893 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f90a139-ad60-49f0-ad1b-e66a0baf7184/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2022-12-14 15:22:31,088 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f90a139-ad60-49f0-ad1b-e66a0baf7184/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:22:31,089 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:22:31,090 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:22:31,090 INFO L85 PathProgramCache]: Analyzing trace with hash 1333589230, now seen corresponding path program 7 times [2022-12-14 15:22:31,090 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:22:31,091 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [293412202] [2022-12-14 15:22:31,091 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:22:31,091 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:22:31,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:22:33,230 INFO L134 CoverageAnalysis]: Checked inductivity of 8040 backedges. 0 proven. 1485 refuted. 0 times theorem prover too weak. 6555 trivial. 0 not checked. [2022-12-14 15:22:33,230 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:22:33,230 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [293412202] [2022-12-14 15:22:33,230 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [293412202] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:22:33,230 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [165963790] [2022-12-14 15:22:33,230 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 15:22:33,230 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:22:33,230 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f90a139-ad60-49f0-ad1b-e66a0baf7184/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:22:33,231 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f90a139-ad60-49f0-ad1b-e66a0baf7184/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:22:33,232 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f90a139-ad60-49f0-ad1b-e66a0baf7184/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-12-14 15:22:33,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:22:33,456 INFO L263 TraceCheckSpWp]: Trace formula consists of 1581 conjuncts, 116 conjunts are in the unsatisfiable core [2022-12-14 15:22:33,460 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:22:34,384 INFO L134 CoverageAnalysis]: Checked inductivity of 8040 backedges. 0 proven. 6555 refuted. 0 times theorem prover too weak. 1485 trivial. 0 not checked. [2022-12-14 15:22:34,384 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:22:41,080 INFO L134 CoverageAnalysis]: Checked inductivity of 8040 backedges. 0 proven. 6555 refuted. 0 times theorem prover too weak. 1485 trivial. 0 not checked. [2022-12-14 15:22:41,081 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [165963790] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:22:41,081 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1522321712] [2022-12-14 15:22:41,082 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 15:22:41,082 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:22:41,082 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:22:41,083 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:22:41,083 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:22:41,092 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:22:41,093 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:22:41,109 INFO L321 Elim1Store]: treesize reduction 37, result has 32.7 percent of original size [2022-12-14 15:22:41,109 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 34 [2022-12-14 15:22:41,118 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:22:41,119 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:22:41,142 INFO L321 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2022-12-14 15:22:41,142 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2022-12-14 15:22:41,161 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:22:41,162 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-12-14 15:22:41,198 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:22:41,199 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 15:22:41,213 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 15:22:41,214 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 248 treesize of output 247 [2022-12-14 15:22:41,282 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 [2022-12-14 15:22:41,292 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:22:41,293 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 17 treesize of output 17 [2022-12-14 15:22:41,309 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:22:41,310 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:22:41,343 INFO L321 Elim1Store]: treesize reduction 95, result has 34.0 percent of original size [2022-12-14 15:22:41,343 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 6 case distinctions, treesize of input 78 treesize of output 103 [2022-12-14 15:22:41,388 INFO L321 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2022-12-14 15:22:41,389 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 25 treesize of output 25 [2022-12-14 15:22:41,397 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:22:41,530 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5498#(and (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (= |ULTIMATE.start_main_~#b~0#1.offset| 0) (= |ULTIMATE.start_main_~i~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (ite (= |ULTIMATE.start_main_#t~mem4#1| |ULTIMATE.start_main_#t~mem3#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start_main_#t~mem3#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~j~0#1| 4)))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_~j~0#1| 0) (<= 0 |ULTIMATE.start_main_~#b~0#1.base|) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#b~0#1.base|) (+ |ULTIMATE.start_main_~#b~0#1.offset| (* |ULTIMATE.start_main_~j~0#1| 12) 4)) |ULTIMATE.start_main_#t~mem4#1|) (= |#NULL.base| 0))' at error location [2022-12-14 15:22:41,530 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:22:41,530 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:22:41,530 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 116, 116] total 250 [2022-12-14 15:22:41,531 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [790633319] [2022-12-14 15:22:41,531 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:22:41,531 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 250 states [2022-12-14 15:22:41,531 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:22:41,541 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 250 interpolants. [2022-12-14 15:22:41,549 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31884, Invalid=32886, Unknown=0, NotChecked=0, Total=64770 [2022-12-14 15:22:41,549 INFO L87 Difference]: Start difference. First operand 176 states and 178 transitions. Second operand has 250 states, 250 states have (on average 1.18) internal successors, (295), 250 states have internal predecessors, (295), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:22:51,518 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:22:51,518 INFO L93 Difference]: Finished difference Result 875 states and 1051 transitions. [2022-12-14 15:22:51,519 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 250 states. [2022-12-14 15:22:51,519 INFO L78 Accepts]: Start accepts. Automaton has has 250 states, 250 states have (on average 1.18) internal successors, (295), 250 states have internal predecessors, (295), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 174 [2022-12-14 15:22:51,519 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:22:51,522 INFO L225 Difference]: With dead ends: 875 [2022-12-14 15:22:51,522 INFO L226 Difference]: Without dead ends: 815 [2022-12-14 15:22:51,530 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 577 GetRequests, 324 SyntacticMatches, 0 SemanticMatches, 253 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31671 ImplicationChecksByTransitivity, 8.3s TimeCoverageRelationStatistics Valid=31884, Invalid=32886, Unknown=0, NotChecked=0, Total=64770 [2022-12-14 15:22:51,531 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 1644 mSDsluCounter, 483 mSDsCounter, 0 mSdLazyCounter, 741 mSolverCounterSat, 664 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1644 SdHoareTripleChecker+Valid, 486 SdHoareTripleChecker+Invalid, 1405 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 664 IncrementalHoareTripleChecker+Valid, 741 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-12-14 15:22:51,531 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1644 Valid, 486 Invalid, 1405 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [664 Valid, 741 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-12-14 15:22:51,531 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 815 states. [2022-12-14 15:22:51,543 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 815 to 349. [2022-12-14 15:22:51,543 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 349 states, 348 states have (on average 1.0086206896551724) internal successors, (351), 348 states have internal predecessors, (351), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:22:51,544 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 349 states to 349 states and 351 transitions. [2022-12-14 15:22:51,544 INFO L78 Accepts]: Start accepts. Automaton has 349 states and 351 transitions. Word has length 174 [2022-12-14 15:22:51,544 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:22:51,544 INFO L495 AbstractCegarLoop]: Abstraction has 349 states and 351 transitions. [2022-12-14 15:22:51,545 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 250 states, 250 states have (on average 1.18) internal successors, (295), 250 states have internal predecessors, (295), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:22:51,545 INFO L276 IsEmpty]: Start isEmpty. Operand 349 states and 351 transitions. [2022-12-14 15:22:51,548 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 348 [2022-12-14 15:22:51,548 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:22:51,548 INFO L195 NwaCegarLoop]: trace histogram [247, 94, 1, 1, 1, 1, 1, 1] [2022-12-14 15:22:51,555 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f90a139-ad60-49f0-ad1b-e66a0baf7184/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2022-12-14 15:22:51,749 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f90a139-ad60-49f0-ad1b-e66a0baf7184/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2022-12-14 15:22:51,750 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:22:51,751 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:22:51,752 INFO L85 PathProgramCache]: Analyzing trace with hash 751998993, now seen corresponding path program 8 times [2022-12-14 15:22:51,752 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:22:51,752 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1894283510] [2022-12-14 15:22:51,752 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:22:51,753 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:22:51,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:22:57,828 INFO L134 CoverageAnalysis]: Checked inductivity of 35093 backedges. 0 proven. 4465 refuted. 0 times theorem prover too weak. 30628 trivial. 0 not checked. [2022-12-14 15:22:57,829 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:22:57,829 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1894283510] [2022-12-14 15:22:57,829 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1894283510] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:22:57,829 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [956727927] [2022-12-14 15:22:57,829 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 15:22:57,829 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:22:57,829 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f90a139-ad60-49f0-ad1b-e66a0baf7184/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:22:57,830 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f90a139-ad60-49f0-ad1b-e66a0baf7184/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:22:57,831 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f90a139-ad60-49f0-ad1b-e66a0baf7184/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process