./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-crafted/zero_sum4.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version b5237d83 Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-crafted/zero_sum4.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash ca2dcd06e0389cf665904adfee9ccd6a1a268c87541d3b3b3e0bcffb3a75664e --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-b5237d8 [2022-11-22 02:06:54,638 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-22 02:06:54,640 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-22 02:06:54,661 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-22 02:06:54,662 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-22 02:06:54,663 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-22 02:06:54,664 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-22 02:06:54,666 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-22 02:06:54,667 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-22 02:06:54,668 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-22 02:06:54,669 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-22 02:06:54,671 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-22 02:06:54,671 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-22 02:06:54,672 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-22 02:06:54,673 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-22 02:06:54,674 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-22 02:06:54,675 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-22 02:06:54,676 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-22 02:06:54,677 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-22 02:06:54,679 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-22 02:06:54,681 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-22 02:06:54,685 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-22 02:06:54,686 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-22 02:06:54,687 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-22 02:06:54,690 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-22 02:06:54,690 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-22 02:06:54,691 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-22 02:06:54,692 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-22 02:06:54,692 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-22 02:06:54,693 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-22 02:06:54,693 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-22 02:06:54,694 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-22 02:06:54,695 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-22 02:06:54,696 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-22 02:06:54,697 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-22 02:06:54,697 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-22 02:06:54,698 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-22 02:06:54,698 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-22 02:06:54,711 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-22 02:06:54,712 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-22 02:06:54,713 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-22 02:06:54,715 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-22 02:06:54,751 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-22 02:06:54,751 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-22 02:06:54,751 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-22 02:06:54,751 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-22 02:06:54,752 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-22 02:06:54,752 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-22 02:06:54,752 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-22 02:06:54,753 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-22 02:06:54,753 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-22 02:06:54,753 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-22 02:06:54,753 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-22 02:06:54,753 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-22 02:06:54,753 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-22 02:06:54,754 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-22 02:06:54,754 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-22 02:06:54,754 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-22 02:06:54,754 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-22 02:06:54,754 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-22 02:06:54,759 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-22 02:06:54,759 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-22 02:06:54,759 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-22 02:06:54,759 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-22 02:06:54,760 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-22 02:06:54,760 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-22 02:06:54,760 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-22 02:06:54,760 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-22 02:06:54,761 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-22 02:06:54,761 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-22 02:06:54,762 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-22 02:06:54,762 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-22 02:06:54,763 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-22 02:06:54,763 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-22 02:06:54,763 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-22 02:06:54,764 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-22 02:06:54,764 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-22 02:06:54,764 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-22 02:06:54,765 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-22 02:06:54,765 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-22 02:06:54,765 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-22 02:06:54,765 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-22 02:06:54,766 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-22 02:06:54,766 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_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> ca2dcd06e0389cf665904adfee9ccd6a1a268c87541d3b3b3e0bcffb3a75664e [2022-11-22 02:06:55,072 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-22 02:06:55,113 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-22 02:06:55,116 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-22 02:06:55,117 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-22 02:06:55,117 INFO L275 PluginConnector]: CDTParser initialized [2022-11-22 02:06:55,119 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/../../sv-benchmarks/c/array-crafted/zero_sum4.c [2022-11-22 02:06:58,204 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-22 02:06:58,475 INFO L351 CDTParser]: Found 1 translation units. [2022-11-22 02:06:58,476 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/sv-benchmarks/c/array-crafted/zero_sum4.c [2022-11-22 02:06:58,484 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/data/df6fb8cf0/87c0fb2566a447dc957575ac60c6387f/FLAGa55ba7ad5 [2022-11-22 02:06:58,497 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/data/df6fb8cf0/87c0fb2566a447dc957575ac60c6387f [2022-11-22 02:06:58,500 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-22 02:06:58,501 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-22 02:06:58,506 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-22 02:06:58,507 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-22 02:06:58,511 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-22 02:06:58,511 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 02:06:58" (1/1) ... [2022-11-22 02:06:58,513 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5fd36cf2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:06:58, skipping insertion in model container [2022-11-22 02:06:58,513 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 02:06:58" (1/1) ... [2022-11-22 02:06:58,521 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-22 02:06:58,539 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-22 02:06:58,678 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_9457024f-f710-4521-90cd-1c72951a8c7d/sv-benchmarks/c/array-crafted/zero_sum4.c[400,413] [2022-11-22 02:06:58,699 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-22 02:06:58,708 INFO L203 MainTranslator]: Completed pre-run [2022-11-22 02:06:58,720 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_9457024f-f710-4521-90cd-1c72951a8c7d/sv-benchmarks/c/array-crafted/zero_sum4.c[400,413] [2022-11-22 02:06:58,731 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-22 02:06:58,746 INFO L208 MainTranslator]: Completed translation [2022-11-22 02:06:58,747 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:06:58 WrapperNode [2022-11-22 02:06:58,747 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-22 02:06:58,748 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-22 02:06:58,748 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-22 02:06:58,749 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-22 02:06:58,756 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:06:58" (1/1) ... [2022-11-22 02:06:58,777 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:06:58" (1/1) ... [2022-11-22 02:06:58,794 INFO L138 Inliner]: procedures = 15, calls = 19, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 127 [2022-11-22 02:06:58,795 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-22 02:06:58,796 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-22 02:06:58,796 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-22 02:06:58,796 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-22 02:06:58,804 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:06:58" (1/1) ... [2022-11-22 02:06:58,804 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:06:58" (1/1) ... [2022-11-22 02:06:58,807 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:06:58" (1/1) ... [2022-11-22 02:06:58,808 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:06:58" (1/1) ... [2022-11-22 02:06:58,813 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:06:58" (1/1) ... [2022-11-22 02:06:58,818 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:06:58" (1/1) ... [2022-11-22 02:06:58,820 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:06:58" (1/1) ... [2022-11-22 02:06:58,821 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:06:58" (1/1) ... [2022-11-22 02:06:58,823 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-22 02:06:58,824 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-22 02:06:58,824 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-22 02:06:58,824 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-22 02:06:58,825 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:06:58" (1/1) ... [2022-11-22 02:06:58,832 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-22 02:06:58,844 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:06:58,871 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-22 02:06:58,886 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-22 02:06:58,921 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-22 02:06:58,922 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-22 02:06:58,922 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-11-22 02:06:58,922 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-11-22 02:06:58,922 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-22 02:06:58,923 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-22 02:06:58,923 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-11-22 02:06:58,923 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-11-22 02:06:58,999 INFO L235 CfgBuilder]: Building ICFG [2022-11-22 02:06:59,001 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-22 02:06:59,273 INFO L276 CfgBuilder]: Performing block encoding [2022-11-22 02:06:59,381 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-22 02:06:59,383 INFO L300 CfgBuilder]: Removed 9 assume(true) statements. [2022-11-22 02:06:59,386 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 02:06:59 BoogieIcfgContainer [2022-11-22 02:06:59,386 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-22 02:06:59,388 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-22 02:06:59,389 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-22 02:06:59,394 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-22 02:06:59,394 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.11 02:06:58" (1/3) ... [2022-11-22 02:06:59,395 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2c812f94 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 02:06:59, skipping insertion in model container [2022-11-22 02:06:59,395 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:06:58" (2/3) ... [2022-11-22 02:06:59,397 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2c812f94 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 02:06:59, skipping insertion in model container [2022-11-22 02:06:59,398 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 02:06:59" (3/3) ... [2022-11-22 02:06:59,399 INFO L112 eAbstractionObserver]: Analyzing ICFG zero_sum4.c [2022-11-22 02:06:59,419 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-22 02:06:59,420 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-22 02:06:59,488 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-22 02:06:59,497 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;@25c7e7fd, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-22 02:06:59,498 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-22 02:06:59,502 INFO L276 IsEmpty]: Start isEmpty. Operand has 17 states, 15 states have (on average 1.8) internal successors, (27), 16 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:06:59,509 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-22 02:06:59,509 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:06:59,510 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:06:59,512 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:06:59,521 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:06:59,521 INFO L85 PathProgramCache]: Analyzing trace with hash -1453537585, now seen corresponding path program 1 times [2022-11-22 02:06:59,529 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:06:59,529 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [903083110] [2022-11-22 02:06:59,530 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:06:59,530 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:06:59,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:06:59,859 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:06:59,859 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:06:59,859 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [903083110] [2022-11-22 02:06:59,860 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [903083110] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 02:06:59,860 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 02:06:59,861 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-22 02:06:59,862 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [74541905] [2022-11-22 02:06:59,863 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 02:06:59,867 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-22 02:06:59,868 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:06:59,897 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-22 02:06:59,898 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-22 02:06:59,900 INFO L87 Difference]: Start difference. First operand has 17 states, 15 states have (on average 1.8) internal successors, (27), 16 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 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) [2022-11-22 02:06:59,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:06:59,968 INFO L93 Difference]: Finished difference Result 32 states and 51 transitions. [2022-11-22 02:06:59,971 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-22 02:06:59,973 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 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 13 [2022-11-22 02:06:59,973 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:06:59,980 INFO L225 Difference]: With dead ends: 32 [2022-11-22 02:06:59,981 INFO L226 Difference]: Without dead ends: 15 [2022-11-22 02:06:59,983 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-22 02:06:59,990 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 0 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-22 02:06:59,991 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 10 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-22 02:07:00,008 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2022-11-22 02:07:00,024 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2022-11-22 02:07:00,025 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.6428571428571428) internal successors, (23), 14 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:07:00,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 23 transitions. [2022-11-22 02:07:00,028 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 23 transitions. Word has length 13 [2022-11-22 02:07:00,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:07:00,029 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 23 transitions. [2022-11-22 02:07:00,029 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 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) [2022-11-22 02:07:00,029 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 23 transitions. [2022-11-22 02:07:00,030 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-11-22 02:07:00,030 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:07:00,031 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:07:00,031 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-22 02:07:00,031 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:07:00,032 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:07:00,033 INFO L85 PathProgramCache]: Analyzing trace with hash -1839481755, now seen corresponding path program 1 times [2022-11-22 02:07:00,033 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:07:00,033 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1165606731] [2022-11-22 02:07:00,033 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:07:00,034 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:07:00,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:07:00,173 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-22 02:07:00,173 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:07:00,174 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1165606731] [2022-11-22 02:07:00,174 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1165606731] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 02:07:00,174 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 02:07:00,174 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-22 02:07:00,174 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [483199371] [2022-11-22 02:07:00,175 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 02:07:00,176 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-22 02:07:00,176 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:07:00,177 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-22 02:07:00,177 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-22 02:07:00,177 INFO L87 Difference]: Start difference. First operand 15 states and 23 transitions. Second operand has 4 states, 4 states have (on average 3.5) internal successors, (14), 4 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:07:00,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:07:00,240 INFO L93 Difference]: Finished difference Result 33 states and 55 transitions. [2022-11-22 02:07:00,240 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-22 02:07:00,241 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 4 states have internal predecessors, (14), 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 14 [2022-11-22 02:07:00,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:07:00,241 INFO L225 Difference]: With dead ends: 33 [2022-11-22 02:07:00,242 INFO L226 Difference]: Without dead ends: 23 [2022-11-22 02:07:00,242 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-22 02:07:00,243 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 27 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 5 SdHoareTripleChecker+Invalid, 45 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-22 02:07:00,244 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [27 Valid, 5 Invalid, 45 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-22 02:07:00,245 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2022-11-22 02:07:00,250 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2022-11-22 02:07:00,250 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 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) [2022-11-22 02:07:00,251 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 31 transitions. [2022-11-22 02:07:00,251 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 31 transitions. Word has length 14 [2022-11-22 02:07:00,252 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:07:00,252 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 31 transitions. [2022-11-22 02:07:00,252 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 4 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:07:00,252 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 31 transitions. [2022-11-22 02:07:00,253 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-11-22 02:07:00,253 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:07:00,253 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:07:00,253 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-22 02:07:00,254 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:07:00,254 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:07:00,254 INFO L85 PathProgramCache]: Analyzing trace with hash 1144628674, now seen corresponding path program 1 times [2022-11-22 02:07:00,254 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:07:00,255 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1258479238] [2022-11-22 02:07:00,255 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:07:00,255 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:07:00,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:07:00,378 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-11-22 02:07:00,379 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:07:00,379 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1258479238] [2022-11-22 02:07:00,379 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1258479238] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:07:00,380 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [617324516] [2022-11-22 02:07:00,380 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:07:00,380 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:07:00,380 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:07:00,384 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:07:00,395 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-22 02:07:00,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:07:00,507 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-22 02:07:00,513 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:07:00,597 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-11-22 02:07:00,598 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:07:00,663 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-11-22 02:07:00,663 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [617324516] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:07:00,664 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1009594797] [2022-11-22 02:07:00,716 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-22 02:07:00,716 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:07:00,720 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:07:00,734 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:07:00,734 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:07:00,811 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:07:00,850 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-22 02:07:00,851 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-11-22 02:07:00,876 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:07:00,917 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-22 02:07:00,919 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-22 02:07:00,964 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:07:00,966 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-22 02:07:01,128 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:07:01,132 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:07:01,148 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-22 02:07:01,149 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 244 treesize of output 232 [2022-11-22 02:07:01,259 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-22 02:07:01,653 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:07:01,928 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '336#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:07:01,929 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:07:01,929 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:07:01,929 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2022-11-22 02:07:01,929 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1405388249] [2022-11-22 02:07:01,930 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:07:01,930 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-22 02:07:01,930 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:07:01,931 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-22 02:07:01,931 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2022-11-22 02:07:01,932 INFO L87 Difference]: Start difference. First operand 23 states and 31 transitions. Second operand has 7 states, 7 states have (on average 3.857142857142857) internal successors, (27), 7 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:07:02,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:07:02,009 INFO L93 Difference]: Finished difference Result 43 states and 59 transitions. [2022-11-22 02:07:02,010 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-22 02:07:02,010 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.857142857142857) internal successors, (27), 7 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2022-11-22 02:07:02,010 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:07:02,011 INFO L225 Difference]: With dead ends: 43 [2022-11-22 02:07:02,011 INFO L226 Difference]: Without dead ends: 24 [2022-11-22 02:07:02,012 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 53 SyntacticMatches, 5 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2022-11-22 02:07:02,013 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 76 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 78 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 76 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 02:07:02,014 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 9 Invalid, 78 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 76 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 02:07:02,015 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2022-11-22 02:07:02,025 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2022-11-22 02:07:02,025 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 23 states have (on average 1.391304347826087) internal successors, (32), 23 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:07:02,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 32 transitions. [2022-11-22 02:07:02,027 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 32 transitions. Word has length 22 [2022-11-22 02:07:02,027 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:07:02,027 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 32 transitions. [2022-11-22 02:07:02,027 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.857142857142857) internal successors, (27), 7 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:07:02,028 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 32 transitions. [2022-11-22 02:07:02,030 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-11-22 02:07:02,030 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:07:02,030 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:07:02,042 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-22 02:07:02,237 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2022-11-22 02:07:02,237 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:07:02,238 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:07:02,238 INFO L85 PathProgramCache]: Analyzing trace with hash 88512748, now seen corresponding path program 2 times [2022-11-22 02:07:02,238 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:07:02,238 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1625887316] [2022-11-22 02:07:02,238 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:07:02,239 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:07:02,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:07:02,336 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-22 02:07:02,337 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:07:02,337 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1625887316] [2022-11-22 02:07:02,337 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1625887316] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:07:02,337 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [464598271] [2022-11-22 02:07:02,337 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:07:02,338 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:07:02,338 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:07:02,339 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:07:02,363 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-22 02:07:02,431 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-22 02:07:02,431 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:07:02,433 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-22 02:07:02,435 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:07:02,507 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-22 02:07:02,507 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:07:02,557 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-22 02:07:02,558 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [464598271] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:07:02,558 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1230129711] [2022-11-22 02:07:02,561 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-22 02:07:02,561 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:07:02,562 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:07:02,562 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:07:02,562 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:07:02,587 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:07:02,617 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-22 02:07:02,618 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-11-22 02:07:02,635 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:07:02,669 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-22 02:07:02,669 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-22 02:07:02,705 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:07:02,707 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-22 02:07:02,788 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:07:02,790 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:07:02,818 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-22 02:07:02,818 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-11-22 02:07:02,923 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-22 02:07:03,189 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:07:03,451 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '602#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:07:03,451 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:07:03,451 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:07:03,451 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2022-11-22 02:07:03,451 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1146963266] [2022-11-22 02:07:03,451 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:07:03,452 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-22 02:07:03,452 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:07:03,452 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-22 02:07:03,453 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=118, Unknown=0, NotChecked=0, Total=156 [2022-11-22 02:07:03,453 INFO L87 Difference]: Start difference. First operand 24 states and 32 transitions. Second operand has 8 states, 8 states have (on average 5.0) internal successors, (40), 8 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:07:03,536 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:07:03,536 INFO L93 Difference]: Finished difference Result 49 states and 71 transitions. [2022-11-22 02:07:03,537 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-22 02:07:03,537 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 5.0) internal successors, (40), 8 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2022-11-22 02:07:03,537 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:07:03,538 INFO L225 Difference]: With dead ends: 49 [2022-11-22 02:07:03,538 INFO L226 Difference]: Without dead ends: 32 [2022-11-22 02:07:03,539 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 54 SyntacticMatches, 7 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=38, Invalid=118, Unknown=0, NotChecked=0, Total=156 [2022-11-22 02:07:03,540 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 8 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 56 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 5 SdHoareTripleChecker+Invalid, 96 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 56 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 02:07:03,540 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 5 Invalid, 96 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [56 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 02:07:03,541 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2022-11-22 02:07:03,545 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2022-11-22 02:07:03,545 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 31 states have (on average 1.2903225806451613) internal successors, (40), 31 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:07:03,546 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 40 transitions. [2022-11-22 02:07:03,546 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 40 transitions. Word has length 23 [2022-11-22 02:07:03,547 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:07:03,547 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 40 transitions. [2022-11-22 02:07:03,547 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 5.0) internal successors, (40), 8 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:07:03,547 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 40 transitions. [2022-11-22 02:07:03,548 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-11-22 02:07:03,548 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:07:03,548 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:07:03,555 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-22 02:07:03,754 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:07:03,754 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:07:03,755 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:07:03,755 INFO L85 PathProgramCache]: Analyzing trace with hash -1125282897, now seen corresponding path program 3 times [2022-11-22 02:07:03,755 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:07:03,755 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1481195040] [2022-11-22 02:07:03,755 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:07:03,756 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:07:03,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:07:07,045 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:07:07,045 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:07:07,045 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1481195040] [2022-11-22 02:07:07,045 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1481195040] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:07:07,046 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1434795218] [2022-11-22 02:07:07,046 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:07:07,046 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:07:07,046 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:07:07,047 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:07:07,067 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-22 02:07:07,132 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:07:07,132 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:07:07,134 INFO L263 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 80 conjunts are in the unsatisfiable core [2022-11-22 02:07:07,138 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:07:07,171 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2022-11-22 02:07:07,725 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:07:07,727 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-22 02:07:07,729 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 15 treesize of output 9 [2022-11-22 02:07:07,770 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:07:07,771 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:07:08,089 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-22 02:07:08,090 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1434795218] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:07:08,090 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1379219739] [2022-11-22 02:07:08,092 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-22 02:07:08,093 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:07:08,093 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:07:08,093 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:07:08,094 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:07:08,111 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:07:08,138 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-22 02:07:08,139 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-11-22 02:07:08,152 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:07:08,184 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-22 02:07:08,184 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-22 02:07:08,215 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:07:08,216 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-22 02:07:08,298 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:07:08,300 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:07:08,346 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-22 02:07:08,346 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-11-22 02:07:08,435 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-22 02:07:08,666 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:07:09,120 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '954#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:07:09,120 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:07:09,120 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:07:09,120 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 9] total 18 [2022-11-22 02:07:09,120 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1132161895] [2022-11-22 02:07:09,121 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:07:09,121 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-11-22 02:07:09,121 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:07:09,122 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-11-22 02:07:09,122 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2022-11-22 02:07:09,122 INFO L87 Difference]: Start difference. First operand 32 states and 40 transitions. Second operand has 18 states, 18 states have (on average 3.2777777777777777) internal successors, (59), 18 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:07:09,596 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:07:09,596 INFO L93 Difference]: Finished difference Result 57 states and 72 transitions. [2022-11-22 02:07:09,597 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-22 02:07:09,598 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 3.2777777777777777) internal successors, (59), 18 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 31 [2022-11-22 02:07:09,598 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:07:09,599 INFO L225 Difference]: With dead ends: 57 [2022-11-22 02:07:09,599 INFO L226 Difference]: Without dead ends: 54 [2022-11-22 02:07:09,599 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 60 SyntacticMatches, 40 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 268 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=69, Invalid=483, Unknown=0, NotChecked=0, Total=552 [2022-11-22 02:07:09,600 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 20 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 384 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 386 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 384 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-22 02:07:09,601 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 21 Invalid, 386 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 384 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-22 02:07:09,601 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2022-11-22 02:07:09,614 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 52. [2022-11-22 02:07:09,615 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 51 states have (on average 1.3137254901960784) internal successors, (67), 51 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:07:09,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 67 transitions. [2022-11-22 02:07:09,619 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 67 transitions. Word has length 31 [2022-11-22 02:07:09,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:07:09,619 INFO L495 AbstractCegarLoop]: Abstraction has 52 states and 67 transitions. [2022-11-22 02:07:09,620 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 3.2777777777777777) internal successors, (59), 18 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:07:09,620 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 67 transitions. [2022-11-22 02:07:09,620 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-11-22 02:07:09,621 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:07:09,621 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:07:09,633 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-22 02:07:09,827 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:07:09,827 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:07:09,828 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:07:09,828 INFO L85 PathProgramCache]: Analyzing trace with hash -76458201, now seen corresponding path program 4 times [2022-11-22 02:07:09,828 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:07:09,828 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [535718090] [2022-11-22 02:07:09,828 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:07:09,829 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:07:09,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:07:09,987 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-11-22 02:07:09,987 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:07:09,987 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [535718090] [2022-11-22 02:07:09,987 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [535718090] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:07:09,988 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [773269573] [2022-11-22 02:07:09,988 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 02:07:09,988 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:07:09,988 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:07:09,989 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:07:10,023 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-22 02:07:10,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:07:10,079 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-22 02:07:10,082 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:07:10,145 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-11-22 02:07:10,145 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:07:10,202 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-11-22 02:07:10,202 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [773269573] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:07:10,202 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1619883812] [2022-11-22 02:07:10,206 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-22 02:07:10,206 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:07:10,207 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:07:10,207 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:07:10,207 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:07:10,230 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:07:10,257 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-22 02:07:10,257 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-22 02:07:10,272 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:07:10,274 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-22 02:07:10,295 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:07:10,296 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-22 02:07:10,350 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:07:10,351 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:07:10,375 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-22 02:07:10,375 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-11-22 02:07:10,459 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-22 02:07:10,680 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:07:10,957 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1366#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:07:10,957 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:07:10,957 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:07:10,958 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2022-11-22 02:07:10,958 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [772754946] [2022-11-22 02:07:10,958 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:07:10,958 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-22 02:07:10,958 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:07:10,959 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-22 02:07:10,959 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=274, Unknown=0, NotChecked=0, Total=342 [2022-11-22 02:07:10,959 INFO L87 Difference]: Start difference. First operand 52 states and 67 transitions. Second operand has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:07:11,177 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:07:11,177 INFO L93 Difference]: Finished difference Result 102 states and 132 transitions. [2022-11-22 02:07:11,178 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-22 02:07:11,178 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 states have internal predecessors, (33), 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 32 [2022-11-22 02:07:11,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:07:11,179 INFO L225 Difference]: With dead ends: 102 [2022-11-22 02:07:11,179 INFO L226 Difference]: Without dead ends: 53 [2022-11-22 02:07:11,179 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 77 SyntacticMatches, 9 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 192 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=94, Invalid=368, Unknown=0, NotChecked=0, Total=462 [2022-11-22 02:07:11,180 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 46 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 188 mSolverCounterSat, 62 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 250 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 62 IncrementalHoareTripleChecker+Valid, 188 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 02:07:11,180 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [46 Valid, 9 Invalid, 250 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [62 Valid, 188 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 02:07:11,181 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2022-11-22 02:07:11,190 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2022-11-22 02:07:11,190 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 52 states have (on average 1.3076923076923077) internal successors, (68), 52 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:07:11,190 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 68 transitions. [2022-11-22 02:07:11,191 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 68 transitions. Word has length 32 [2022-11-22 02:07:11,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:07:11,191 INFO L495 AbstractCegarLoop]: Abstraction has 53 states and 68 transitions. [2022-11-22 02:07:11,191 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:07:11,191 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 68 transitions. [2022-11-22 02:07:11,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-11-22 02:07:11,192 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:07:11,192 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:07:11,203 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-22 02:07:11,398 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:07:11,398 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:07:11,399 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:07:11,399 INFO L85 PathProgramCache]: Analyzing trace with hash 1622138321, now seen corresponding path program 5 times [2022-11-22 02:07:11,399 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:07:11,399 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2098560471] [2022-11-22 02:07:11,399 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:07:11,399 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:07:11,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:07:11,520 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-11-22 02:07:11,520 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:07:11,520 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2098560471] [2022-11-22 02:07:11,520 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2098560471] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:07:11,520 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [709777034] [2022-11-22 02:07:11,521 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:07:11,521 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:07:11,521 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:07:11,522 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:07:11,547 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-22 02:07:11,612 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-22 02:07:11,612 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:07:11,614 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-22 02:07:11,615 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:07:11,671 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-11-22 02:07:11,672 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:07:11,725 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-11-22 02:07:11,726 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [709777034] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:07:11,726 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [857730625] [2022-11-22 02:07:11,730 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-22 02:07:11,730 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:07:11,731 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:07:11,731 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:07:11,731 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:07:11,748 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:07:11,773 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-22 02:07:11,773 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-11-22 02:07:11,785 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:07:11,812 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-22 02:07:11,812 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-22 02:07:11,837 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:07:11,840 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-22 02:07:11,893 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:07:11,894 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:07:11,919 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-22 02:07:11,919 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-11-22 02:07:12,002 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-22 02:07:12,240 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:07:12,579 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1880#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:07:12,580 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:07:12,580 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:07:12,580 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2022-11-22 02:07:12,580 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1660819161] [2022-11-22 02:07:12,580 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:07:12,580 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-22 02:07:12,581 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:07:12,581 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-22 02:07:12,581 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=271, Unknown=0, NotChecked=0, Total=342 [2022-11-22 02:07:12,581 INFO L87 Difference]: Start difference. First operand 53 states and 68 transitions. Second operand has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:07:12,761 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:07:12,761 INFO L93 Difference]: Finished difference Result 82 states and 110 transitions. [2022-11-22 02:07:12,762 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-22 02:07:12,762 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 states have internal predecessors, (33), 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 33 [2022-11-22 02:07:12,762 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:07:12,762 INFO L225 Difference]: With dead ends: 82 [2022-11-22 02:07:12,763 INFO L226 Difference]: Without dead ends: 41 [2022-11-22 02:07:12,763 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 76 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 247 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=114, Invalid=392, Unknown=0, NotChecked=0, Total=506 [2022-11-22 02:07:12,764 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 107 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 113 mSolverCounterSat, 53 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 107 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 166 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 53 IncrementalHoareTripleChecker+Valid, 113 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 02:07:12,764 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [107 Valid, 11 Invalid, 166 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [53 Valid, 113 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 02:07:12,765 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2022-11-22 02:07:12,770 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2022-11-22 02:07:12,770 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 40 states have (on average 1.225) internal successors, (49), 40 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:07:12,771 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 49 transitions. [2022-11-22 02:07:12,771 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 49 transitions. Word has length 33 [2022-11-22 02:07:12,771 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:07:12,771 INFO L495 AbstractCegarLoop]: Abstraction has 41 states and 49 transitions. [2022-11-22 02:07:12,771 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:07:12,771 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 49 transitions. [2022-11-22 02:07:12,772 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-11-22 02:07:12,772 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:07:12,772 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:07:12,783 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-22 02:07:12,972 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:07:12,973 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:07:12,973 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:07:12,973 INFO L85 PathProgramCache]: Analyzing trace with hash -231017630, now seen corresponding path program 6 times [2022-11-22 02:07:12,973 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:07:12,973 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1105147044] [2022-11-22 02:07:12,973 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:07:12,974 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:07:13,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:07:17,160 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 54 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:07:17,160 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:07:17,160 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1105147044] [2022-11-22 02:07:17,160 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1105147044] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:07:17,160 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [823483227] [2022-11-22 02:07:17,160 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:07:17,160 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:07:17,161 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:07:17,163 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:07:17,175 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-22 02:07:17,267 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:07:17,267 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:07:17,270 WARN L261 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 114 conjunts are in the unsatisfiable core [2022-11-22 02:07:17,274 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:07:17,306 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2022-11-22 02:07:18,478 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 54 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:07:18,479 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:07:19,130 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 48 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-22 02:07:19,130 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [823483227] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:07:19,130 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [797439890] [2022-11-22 02:07:19,132 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-22 02:07:19,132 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:07:19,133 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:07:19,133 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:07:19,133 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:07:19,148 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:07:19,171 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-22 02:07:19,172 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-11-22 02:07:19,188 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:07:19,219 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-22 02:07:19,219 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-22 02:07:19,246 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:07:19,247 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-22 02:07:19,295 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:07:19,296 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:07:19,317 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-22 02:07:19,317 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-11-22 02:07:19,397 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-22 02:07:19,606 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:07:20,841 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2404#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:07:20,841 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:07:20,841 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:07:20,842 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 15, 11] total 44 [2022-11-22 02:07:20,842 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1770712704] [2022-11-22 02:07:20,842 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:07:20,842 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2022-11-22 02:07:20,842 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:07:20,843 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2022-11-22 02:07:20,844 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=183, Invalid=2169, Unknown=0, NotChecked=0, Total=2352 [2022-11-22 02:07:20,844 INFO L87 Difference]: Start difference. First operand 41 states and 49 transitions. Second operand has 44 states, 44 states have (on average 2.409090909090909) internal successors, (106), 44 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:07:23,992 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:07:23,993 INFO L93 Difference]: Finished difference Result 112 states and 139 transitions. [2022-11-22 02:07:23,993 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-11-22 02:07:23,993 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 2.409090909090909) internal successors, (106), 44 states have internal predecessors, (106), 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 40 [2022-11-22 02:07:23,994 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:07:23,996 INFO L225 Difference]: With dead ends: 112 [2022-11-22 02:07:23,996 INFO L226 Difference]: Without dead ends: 109 [2022-11-22 02:07:23,998 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 180 GetRequests, 73 SyntacticMatches, 37 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2227 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=464, Invalid=4648, Unknown=0, NotChecked=0, Total=5112 [2022-11-22 02:07:23,999 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 43 mSDsluCounter, 91 mSDsCounter, 0 mSdLazyCounter, 1250 mSolverCounterSat, 202 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 96 SdHoareTripleChecker+Invalid, 1452 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 202 IncrementalHoareTripleChecker+Valid, 1250 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-11-22 02:07:23,999 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [43 Valid, 96 Invalid, 1452 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [202 Valid, 1250 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2022-11-22 02:07:24,000 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2022-11-22 02:07:24,020 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 90. [2022-11-22 02:07:24,021 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 89 states have (on average 1.2696629213483146) internal successors, (113), 89 states have internal predecessors, (113), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:07:24,021 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 113 transitions. [2022-11-22 02:07:24,021 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 113 transitions. Word has length 40 [2022-11-22 02:07:24,022 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:07:24,022 INFO L495 AbstractCegarLoop]: Abstraction has 90 states and 113 transitions. [2022-11-22 02:07:24,022 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 2.409090909090909) internal successors, (106), 44 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:07:24,022 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 113 transitions. [2022-11-22 02:07:24,023 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-11-22 02:07:24,023 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:07:24,024 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:07:24,029 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-22 02:07:24,229 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2022-11-22 02:07:24,229 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:07:24,230 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:07:24,230 INFO L85 PathProgramCache]: Analyzing trace with hash -1059651906, now seen corresponding path program 7 times [2022-11-22 02:07:24,230 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:07:24,230 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [724107240] [2022-11-22 02:07:24,230 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:07:24,230 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:07:24,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:07:24,388 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 7 proven. 9 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2022-11-22 02:07:24,388 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:07:24,388 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [724107240] [2022-11-22 02:07:24,388 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [724107240] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:07:24,388 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2090073108] [2022-11-22 02:07:24,389 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 02:07:24,389 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:07:24,389 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:07:24,390 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:07:24,419 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-22 02:07:24,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:07:24,484 INFO L263 TraceCheckSpWp]: Trace formula consists of 228 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-22 02:07:24,486 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:07:24,573 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2022-11-22 02:07:24,573 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:07:24,650 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2022-11-22 02:07:24,650 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2090073108] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:07:24,651 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [643314375] [2022-11-22 02:07:24,653 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-22 02:07:24,653 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:07:24,653 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:07:24,653 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:07:24,653 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:07:24,669 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:07:24,697 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-22 02:07:24,697 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-22 02:07:24,707 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:07:24,709 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-22 02:07:24,728 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:07:24,729 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-22 02:07:24,792 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:07:24,794 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:07:24,807 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-22 02:07:24,807 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 244 treesize of output 232 [2022-11-22 02:07:24,848 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-22 02:07:25,028 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:07:25,674 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3100#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:07:25,674 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:07:25,674 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:07:25,675 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 17 [2022-11-22 02:07:25,675 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [449513739] [2022-11-22 02:07:25,675 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:07:25,675 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-11-22 02:07:25,675 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:07:25,676 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-11-22 02:07:25,676 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=371, Unknown=0, NotChecked=0, Total=462 [2022-11-22 02:07:25,676 INFO L87 Difference]: Start difference. First operand 90 states and 113 transitions. Second operand has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:07:25,934 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:07:25,934 INFO L93 Difference]: Finished difference Result 190 states and 238 transitions. [2022-11-22 02:07:25,934 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-22 02:07:25,935 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 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 41 [2022-11-22 02:07:25,935 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:07:25,935 INFO L225 Difference]: With dead ends: 190 [2022-11-22 02:07:25,936 INFO L226 Difference]: Without dead ends: 86 [2022-11-22 02:07:25,936 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 84 SyntacticMatches, 28 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 535 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=131, Invalid=519, Unknown=0, NotChecked=0, Total=650 [2022-11-22 02:07:25,937 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 44 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 240 mSolverCounterSat, 76 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 316 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 76 IncrementalHoareTripleChecker+Valid, 240 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 02:07:25,937 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [44 Valid, 11 Invalid, 316 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [76 Valid, 240 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 02:07:25,938 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2022-11-22 02:07:25,958 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 86. [2022-11-22 02:07:25,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 85 states have (on average 1.2588235294117647) internal successors, (107), 85 states have internal predecessors, (107), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:07:25,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 107 transitions. [2022-11-22 02:07:25,960 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 107 transitions. Word has length 41 [2022-11-22 02:07:25,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:07:25,960 INFO L495 AbstractCegarLoop]: Abstraction has 86 states and 107 transitions. [2022-11-22 02:07:25,960 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:07:25,960 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 107 transitions. [2022-11-22 02:07:25,961 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2022-11-22 02:07:25,961 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:07:25,961 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:07:25,972 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-22 02:07:26,172 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2022-11-22 02:07:26,172 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:07:26,173 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:07:26,173 INFO L85 PathProgramCache]: Analyzing trace with hash 190076756, now seen corresponding path program 8 times [2022-11-22 02:07:26,173 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:07:26,173 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2018466078] [2022-11-22 02:07:26,173 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:07:26,174 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:07:26,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:07:26,328 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 3 proven. 13 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2022-11-22 02:07:26,328 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:07:26,328 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2018466078] [2022-11-22 02:07:26,328 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2018466078] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:07:26,328 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [955986270] [2022-11-22 02:07:26,329 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:07:26,329 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:07:26,329 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:07:26,330 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:07:26,351 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-22 02:07:26,436 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-22 02:07:26,436 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:07:26,438 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-22 02:07:26,439 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:07:26,573 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2022-11-22 02:07:26,573 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:07:26,679 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2022-11-22 02:07:26,680 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [955986270] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:07:26,680 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1022514063] [2022-11-22 02:07:26,681 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-22 02:07:26,681 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:07:26,682 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:07:26,682 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:07:26,682 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:07:26,696 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:07:26,720 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-22 02:07:26,720 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-11-22 02:07:26,732 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:07:26,759 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-22 02:07:26,759 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-22 02:07:26,782 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:07:26,783 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-22 02:07:26,848 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:07:26,849 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:07:26,872 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-22 02:07:26,873 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-11-22 02:07:26,946 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-22 02:07:27,129 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:07:27,666 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3918#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:07:27,666 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:07:27,666 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:07:27,666 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 20 [2022-11-22 02:07:27,666 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1011567363] [2022-11-22 02:07:27,666 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:07:27,667 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-11-22 02:07:27,667 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:07:27,667 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-11-22 02:07:27,668 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=497, Unknown=0, NotChecked=0, Total=600 [2022-11-22 02:07:27,668 INFO L87 Difference]: Start difference. First operand 86 states and 107 transitions. Second operand has 20 states, 20 states have (on average 2.7) internal successors, (54), 20 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:07:27,996 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:07:27,996 INFO L93 Difference]: Finished difference Result 121 states and 155 transitions. [2022-11-22 02:07:27,997 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-22 02:07:27,997 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.7) internal successors, (54), 20 states have internal predecessors, (54), 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 42 [2022-11-22 02:07:27,997 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:07:27,997 INFO L225 Difference]: With dead ends: 121 [2022-11-22 02:07:27,997 INFO L226 Difference]: Without dead ends: 50 [2022-11-22 02:07:27,998 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 93 SyntacticMatches, 24 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 641 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=180, Invalid=750, Unknown=0, NotChecked=0, Total=930 [2022-11-22 02:07:27,999 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 71 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 307 mSolverCounterSat, 140 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 71 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 447 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 140 IncrementalHoareTripleChecker+Valid, 307 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 02:07:27,999 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [71 Valid, 15 Invalid, 447 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [140 Valid, 307 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 02:07:27,999 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2022-11-22 02:07:28,009 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2022-11-22 02:07:28,009 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 49 states have (on average 1.183673469387755) internal successors, (58), 49 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:07:28,010 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 58 transitions. [2022-11-22 02:07:28,010 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 58 transitions. Word has length 42 [2022-11-22 02:07:28,010 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:07:28,010 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 58 transitions. [2022-11-22 02:07:28,010 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 2.7) internal successors, (54), 20 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:07:28,011 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 58 transitions. [2022-11-22 02:07:28,011 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-11-22 02:07:28,011 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:07:28,011 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:07:28,022 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-22 02:07:28,217 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:07:28,218 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:07:28,218 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:07:28,219 INFO L85 PathProgramCache]: Analyzing trace with hash 775002255, now seen corresponding path program 9 times [2022-11-22 02:07:28,219 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:07:28,219 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [234793405] [2022-11-22 02:07:28,219 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:07:28,219 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:07:28,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:07:34,535 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 2 proven. 88 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:07:34,536 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:07:34,536 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [234793405] [2022-11-22 02:07:34,536 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [234793405] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:07:34,536 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [104502657] [2022-11-22 02:07:34,536 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:07:34,537 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:07:34,537 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:07:34,539 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:07:34,554 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-22 02:07:34,649 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:07:34,650 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:07:34,654 WARN L261 TraceCheckSpWp]: Trace formula consists of 272 conjuncts, 150 conjunts are in the unsatisfiable core [2022-11-22 02:07:34,658 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:07:34,749 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2022-11-22 02:07:36,230 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:07:36,230 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:07:37,237 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 80 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-22 02:07:37,238 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [104502657] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:07:37,238 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1167111237] [2022-11-22 02:07:37,240 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-22 02:07:37,240 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:07:37,240 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:07:37,240 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:07:37,241 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:07:37,254 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:07:37,278 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-22 02:07:37,279 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-11-22 02:07:37,291 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:07:37,322 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-22 02:07:37,323 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-22 02:07:37,344 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:07:37,345 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-22 02:07:37,392 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:07:37,395 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:07:37,407 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-22 02:07:37,408 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 244 treesize of output 232 [2022-11-22 02:07:37,449 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-22 02:07:37,653 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:07:39,576 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4613#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:07:39,576 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:07:39,576 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:07:39,576 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 18, 13] total 56 [2022-11-22 02:07:39,576 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1962813798] [2022-11-22 02:07:39,576 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:07:39,577 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2022-11-22 02:07:39,577 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:07:39,578 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2022-11-22 02:07:39,579 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=209, Invalid=3451, Unknown=0, NotChecked=0, Total=3660 [2022-11-22 02:07:39,579 INFO L87 Difference]: Start difference. First operand 50 states and 58 transitions. Second operand has 56 states, 56 states have (on average 2.3214285714285716) internal successors, (130), 56 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:07:45,661 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:07:45,662 INFO L93 Difference]: Finished difference Result 112 states and 140 transitions. [2022-11-22 02:07:45,663 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-11-22 02:07:45,663 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 2.3214285714285716) internal successors, (130), 56 states have internal predecessors, (130), 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 49 [2022-11-22 02:07:45,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:07:45,664 INFO L225 Difference]: With dead ends: 112 [2022-11-22 02:07:45,664 INFO L226 Difference]: Without dead ends: 109 [2022-11-22 02:07:45,666 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 94 SyntacticMatches, 40 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2794 ImplicationChecksByTransitivity, 8.9s TimeCoverageRelationStatistics Valid=525, Invalid=6785, Unknown=0, NotChecked=0, Total=7310 [2022-11-22 02:07:45,666 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 91 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 2386 mSolverCounterSat, 599 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 91 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 2985 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 599 IncrementalHoareTripleChecker+Valid, 2386 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2022-11-22 02:07:45,667 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [91 Valid, 61 Invalid, 2985 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [599 Valid, 2386 Invalid, 0 Unknown, 0 Unchecked, 2.5s Time] [2022-11-22 02:07:45,667 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2022-11-22 02:07:45,699 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 51. [2022-11-22 02:07:45,700 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 50 states have (on average 1.18) internal successors, (59), 50 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:07:45,700 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 59 transitions. [2022-11-22 02:07:45,700 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 59 transitions. Word has length 49 [2022-11-22 02:07:45,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:07:45,701 INFO L495 AbstractCegarLoop]: Abstraction has 51 states and 59 transitions. [2022-11-22 02:07:45,701 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 56 states have (on average 2.3214285714285716) internal successors, (130), 56 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:07:45,701 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 59 transitions. [2022-11-22 02:07:45,702 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-11-22 02:07:45,702 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:07:45,702 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:07:45,713 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-22 02:07:45,907 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:07:45,908 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:07:45,908 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:07:45,908 INFO L85 PathProgramCache]: Analyzing trace with hash -1745466079, now seen corresponding path program 10 times [2022-11-22 02:07:45,908 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:07:45,908 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [298953871] [2022-11-22 02:07:45,908 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:07:45,908 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:07:45,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:07:46,114 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 11 proven. 14 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2022-11-22 02:07:46,115 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:07:46,115 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [298953871] [2022-11-22 02:07:46,115 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [298953871] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:07:46,115 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [556062283] [2022-11-22 02:07:46,115 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 02:07:46,115 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:07:46,116 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:07:46,117 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:07:46,130 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-22 02:07:46,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:07:46,226 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-22 02:07:46,228 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:07:46,379 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2022-11-22 02:07:46,379 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:07:46,499 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2022-11-22 02:07:46,499 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [556062283] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:07:46,499 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [854869952] [2022-11-22 02:07:46,501 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-22 02:07:46,501 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:07:46,501 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:07:46,502 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:07:46,502 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:07:46,520 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:07:46,542 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-22 02:07:46,542 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-11-22 02:07:46,557 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:07:46,582 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-22 02:07:46,582 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-22 02:07:46,611 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:07:46,613 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-22 02:07:46,697 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:07:46,698 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:07:46,721 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-22 02:07:46,721 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-11-22 02:07:46,807 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-22 02:07:46,970 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:07:47,318 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5292#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:07:47,318 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:07:47,318 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:07:47,318 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2022-11-22 02:07:47,318 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1825008503] [2022-11-22 02:07:47,319 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:07:47,319 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-11-22 02:07:47,319 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:07:47,320 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-11-22 02:07:47,320 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=482, Unknown=0, NotChecked=0, Total=600 [2022-11-22 02:07:47,320 INFO L87 Difference]: Start difference. First operand 51 states and 59 transitions. Second operand has 20 states, 20 states have (on average 1.95) internal successors, (39), 20 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) [2022-11-22 02:07:47,610 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:07:47,610 INFO L93 Difference]: Finished difference Result 132 states and 155 transitions. [2022-11-22 02:07:47,610 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-22 02:07:47,611 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.95) internal successors, (39), 20 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) Word has length 50 [2022-11-22 02:07:47,611 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:07:47,611 INFO L225 Difference]: With dead ends: 132 [2022-11-22 02:07:47,611 INFO L226 Difference]: Without dead ends: 52 [2022-11-22 02:07:47,612 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 123 SyntacticMatches, 15 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 418 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=175, Invalid=695, Unknown=0, NotChecked=0, Total=870 [2022-11-22 02:07:47,613 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 29 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 276 mSolverCounterSat, 71 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 347 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 71 IncrementalHoareTripleChecker+Valid, 276 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 02:07:47,613 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [29 Valid, 9 Invalid, 347 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [71 Valid, 276 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 02:07:47,614 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2022-11-22 02:07:47,632 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2022-11-22 02:07:47,633 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 51 states have (on average 1.1764705882352942) internal successors, (60), 51 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:07:47,633 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 60 transitions. [2022-11-22 02:07:47,633 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 60 transitions. Word has length 50 [2022-11-22 02:07:47,634 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:07:47,634 INFO L495 AbstractCegarLoop]: Abstraction has 52 states and 60 transitions. [2022-11-22 02:07:47,634 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.95) internal successors, (39), 20 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) [2022-11-22 02:07:47,634 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 60 transitions. [2022-11-22 02:07:47,635 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2022-11-22 02:07:47,635 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:07:47,635 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:07:47,643 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-22 02:07:47,840 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-11-22 02:07:47,840 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:07:47,841 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:07:47,841 INFO L85 PathProgramCache]: Analyzing trace with hash 738475339, now seen corresponding path program 11 times [2022-11-22 02:07:47,841 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:07:47,841 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1403692166] [2022-11-22 02:07:47,841 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:07:47,841 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:07:47,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:07:48,026 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 6 proven. 19 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2022-11-22 02:07:48,027 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:07:48,027 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1403692166] [2022-11-22 02:07:48,027 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1403692166] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:07:48,027 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [968704761] [2022-11-22 02:07:48,027 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:07:48,028 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:07:48,028 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:07:48,029 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:07:48,059 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-22 02:07:48,158 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-22 02:07:48,158 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:07:48,160 INFO L263 TraceCheckSpWp]: Trace formula consists of 286 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-22 02:07:48,162 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:07:48,284 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2022-11-22 02:07:48,285 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:07:48,403 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2022-11-22 02:07:48,403 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [968704761] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:07:48,403 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1182167598] [2022-11-22 02:07:48,406 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-22 02:07:48,406 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:07:48,407 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:07:48,407 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:07:48,408 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:07:48,424 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:07:48,448 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-22 02:07:48,449 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-22 02:07:48,458 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:07:48,459 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-22 02:07:48,479 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:07:48,480 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-22 02:07:48,542 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:07:48,543 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:07:48,566 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-22 02:07:48,566 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-11-22 02:07:48,636 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-22 02:07:48,813 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:07:49,452 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5982#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:07:49,452 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:07:49,452 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:07:49,452 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2022-11-22 02:07:49,453 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [491814699] [2022-11-22 02:07:49,453 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:07:49,453 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-11-22 02:07:49,453 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:07:49,453 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-11-22 02:07:49,454 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=481, Unknown=0, NotChecked=0, Total=600 [2022-11-22 02:07:49,454 INFO L87 Difference]: Start difference. First operand 52 states and 60 transitions. Second operand has 20 states, 20 states have (on average 2.65) internal successors, (53), 20 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:07:49,696 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:07:49,696 INFO L93 Difference]: Finished difference Result 98 states and 119 transitions. [2022-11-22 02:07:49,697 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-22 02:07:49,697 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.65) internal successors, (53), 20 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 51 [2022-11-22 02:07:49,698 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:07:49,698 INFO L225 Difference]: With dead ends: 98 [2022-11-22 02:07:49,699 INFO L226 Difference]: Without dead ends: 59 [2022-11-22 02:07:49,699 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 105 SyntacticMatches, 36 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 899 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=213, Invalid=717, Unknown=0, NotChecked=0, Total=930 [2022-11-22 02:07:49,701 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 201 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 146 mSolverCounterSat, 84 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 201 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 230 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 84 IncrementalHoareTripleChecker+Valid, 146 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 02:07:49,702 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [201 Valid, 11 Invalid, 230 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [84 Valid, 146 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 02:07:49,704 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2022-11-22 02:07:49,738 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2022-11-22 02:07:49,738 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 58 states have (on average 1.1551724137931034) internal successors, (67), 58 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:07:49,739 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 67 transitions. [2022-11-22 02:07:49,739 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 67 transitions. Word has length 51 [2022-11-22 02:07:49,739 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:07:49,739 INFO L495 AbstractCegarLoop]: Abstraction has 59 states and 67 transitions. [2022-11-22 02:07:49,739 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 2.65) internal successors, (53), 20 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:07:49,740 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 67 transitions. [2022-11-22 02:07:49,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-11-22 02:07:49,741 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:07:49,741 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:07:49,751 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2022-11-22 02:07:49,946 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-11-22 02:07:49,947 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:07:49,948 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:07:49,948 INFO L85 PathProgramCache]: Analyzing trace with hash 7452930, now seen corresponding path program 12 times [2022-11-22 02:07:49,948 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:07:49,949 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1523022482] [2022-11-22 02:07:49,949 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:07:49,949 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:07:50,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:07:58,406 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 4 proven. 131 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:07:58,406 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:07:58,406 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1523022482] [2022-11-22 02:07:58,407 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1523022482] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:07:58,407 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [49004146] [2022-11-22 02:07:58,407 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:07:58,407 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:07:58,407 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:07:58,408 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:07:58,410 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-22 02:07:58,530 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:07:58,530 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:07:58,534 WARN L261 TraceCheckSpWp]: Trace formula consists of 321 conjuncts, 182 conjunts are in the unsatisfiable core [2022-11-22 02:07:58,540 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:07:58,638 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2022-11-22 02:08:01,117 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 0 proven. 135 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:08:01,117 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:08:02,646 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-22 02:08:02,646 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [49004146] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:08:02,646 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [822187167] [2022-11-22 02:08:02,648 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-22 02:08:02,648 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:08:02,648 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:08:02,648 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:08:02,648 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:08:02,671 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:08:02,701 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-22 02:08:02,701 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-22 02:08:02,712 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:08:02,714 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-22 02:08:02,734 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:08:02,735 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-22 02:08:02,779 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:08:02,781 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:08:02,794 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-22 02:08:02,795 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 244 treesize of output 232 [2022-11-22 02:08:02,855 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-22 02:08:03,041 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:08:06,323 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6711#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:08:06,323 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:08:06,323 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:08:06,324 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 21, 15] total 69 [2022-11-22 02:08:06,324 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [871610552] [2022-11-22 02:08:06,324 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:08:06,324 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 69 states [2022-11-22 02:08:06,325 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:08:06,325 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2022-11-22 02:08:06,326 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=270, Invalid=5132, Unknown=0, NotChecked=0, Total=5402 [2022-11-22 02:08:06,327 INFO L87 Difference]: Start difference. First operand 59 states and 67 transitions. Second operand has 69 states, 69 states have (on average 2.246376811594203) internal successors, (155), 69 states have internal predecessors, (155), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:08:15,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:08:15,923 INFO L93 Difference]: Finished difference Result 225 states and 266 transitions. [2022-11-22 02:08:15,923 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2022-11-22 02:08:15,923 INFO L78 Accepts]: Start accepts. Automaton has has 69 states, 69 states have (on average 2.246376811594203) internal successors, (155), 69 states have internal predecessors, (155), 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 58 [2022-11-22 02:08:15,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:08:15,924 INFO L225 Difference]: With dead ends: 225 [2022-11-22 02:08:15,924 INFO L226 Difference]: Without dead ends: 156 [2022-11-22 02:08:15,928 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 272 GetRequests, 102 SyntacticMatches, 55 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5394 ImplicationChecksByTransitivity, 14.9s TimeCoverageRelationStatistics Valid=1031, Invalid=12541, Unknown=0, NotChecked=0, Total=13572 [2022-11-22 02:08:15,929 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 100 mSDsluCounter, 128 mSDsCounter, 0 mSdLazyCounter, 3004 mSolverCounterSat, 943 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 100 SdHoareTripleChecker+Valid, 133 SdHoareTripleChecker+Invalid, 3947 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 943 IncrementalHoareTripleChecker+Valid, 3004 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.3s IncrementalHoareTripleChecker+Time [2022-11-22 02:08:15,929 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [100 Valid, 133 Invalid, 3947 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [943 Valid, 3004 Invalid, 0 Unknown, 0 Unchecked, 3.3s Time] [2022-11-22 02:08:15,930 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2022-11-22 02:08:15,986 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 124. [2022-11-22 02:08:15,986 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 123 states have (on average 1.1788617886178863) internal successors, (145), 123 states have internal predecessors, (145), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:08:15,987 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 145 transitions. [2022-11-22 02:08:15,987 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 145 transitions. Word has length 58 [2022-11-22 02:08:15,987 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:08:15,987 INFO L495 AbstractCegarLoop]: Abstraction has 124 states and 145 transitions. [2022-11-22 02:08:15,988 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 69 states, 69 states have (on average 2.246376811594203) internal successors, (155), 69 states have internal predecessors, (155), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:08:15,988 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 145 transitions. [2022-11-22 02:08:15,989 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2022-11-22 02:08:15,989 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:08:15,989 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:08:16,001 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-22 02:08:16,195 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:08:16,195 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:08:16,195 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:08:16,196 INFO L85 PathProgramCache]: Analyzing trace with hash -794807180, now seen corresponding path program 13 times [2022-11-22 02:08:16,196 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:08:16,196 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [449113119] [2022-11-22 02:08:16,196 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:08:16,196 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:08:16,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:08:16,432 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 10 proven. 26 refuted. 0 times theorem prover too weak. 111 trivial. 0 not checked. [2022-11-22 02:08:16,432 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:08:16,432 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [449113119] [2022-11-22 02:08:16,432 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [449113119] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:08:16,432 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1776387036] [2022-11-22 02:08:16,433 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 02:08:16,433 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:08:16,433 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:08:16,434 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:08:16,460 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-22 02:08:16,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:08:16,552 INFO L263 TraceCheckSpWp]: Trace formula consists of 335 conjuncts, 14 conjunts are in the unsatisfiable core [2022-11-22 02:08:16,553 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:08:16,670 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 15 proven. 21 refuted. 0 times theorem prover too weak. 111 trivial. 0 not checked. [2022-11-22 02:08:16,670 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:08:16,789 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 15 proven. 21 refuted. 0 times theorem prover too weak. 111 trivial. 0 not checked. [2022-11-22 02:08:16,789 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1776387036] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:08:16,790 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [91511674] [2022-11-22 02:08:16,793 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-22 02:08:16,793 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:08:16,793 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:08:16,793 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:08:16,793 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:08:16,806 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:08:16,831 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-22 02:08:16,832 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-22 02:08:16,840 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:08:16,843 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-22 02:08:16,862 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:08:16,863 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-22 02:08:16,910 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:08:16,919 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:08:16,932 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-22 02:08:16,933 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 244 treesize of output 232 [2022-11-22 02:08:16,990 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-22 02:08:17,161 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:08:17,801 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7858#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:08:17,801 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:08:17,801 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:08:17,802 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 23 [2022-11-22 02:08:17,802 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2024074579] [2022-11-22 02:08:17,802 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:08:17,802 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-11-22 02:08:17,802 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:08:17,803 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-11-22 02:08:17,803 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=607, Unknown=0, NotChecked=0, Total=756 [2022-11-22 02:08:17,803 INFO L87 Difference]: Start difference. First operand 124 states and 145 transitions. Second operand has 23 states, 23 states have (on average 1.826086956521739) internal successors, (42), 23 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:08:18,080 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:08:18,080 INFO L93 Difference]: Finished difference Result 171 states and 205 transitions. [2022-11-22 02:08:18,080 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-11-22 02:08:18,080 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.826086956521739) internal successors, (42), 23 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 60 [2022-11-22 02:08:18,081 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:08:18,081 INFO L225 Difference]: With dead ends: 171 [2022-11-22 02:08:18,081 INFO L226 Difference]: Without dead ends: 68 [2022-11-22 02:08:18,082 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 200 GetRequests, 131 SyntacticMatches, 36 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1077 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=276, Invalid=914, Unknown=0, NotChecked=0, Total=1190 [2022-11-22 02:08:18,082 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 359 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 183 mSolverCounterSat, 102 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 359 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 285 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 102 IncrementalHoareTripleChecker+Valid, 183 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 02:08:18,083 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [359 Valid, 13 Invalid, 285 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [102 Valid, 183 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 02:08:18,083 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2022-11-22 02:08:18,110 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2022-11-22 02:08:18,111 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 67 states have (on average 1.1343283582089552) internal successors, (76), 67 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:08:18,111 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 76 transitions. [2022-11-22 02:08:18,111 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 76 transitions. Word has length 60 [2022-11-22 02:08:18,111 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:08:18,111 INFO L495 AbstractCegarLoop]: Abstraction has 68 states and 76 transitions. [2022-11-22 02:08:18,111 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.826086956521739) internal successors, (42), 23 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:08:18,111 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 76 transitions. [2022-11-22 02:08:18,112 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2022-11-22 02:08:18,112 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:08:18,112 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:08:18,119 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2022-11-22 02:08:18,315 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-11-22 02:08:18,315 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:08:18,315 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:08:18,315 INFO L85 PathProgramCache]: Analyzing trace with hash 1806888303, now seen corresponding path program 14 times [2022-11-22 02:08:18,315 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:08:18,316 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [73730845] [2022-11-22 02:08:18,316 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:08:18,316 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:08:18,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:08:30,266 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 9 proven. 180 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:08:30,266 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:08:30,266 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [73730845] [2022-11-22 02:08:30,266 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [73730845] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:08:30,267 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1992190866] [2022-11-22 02:08:30,267 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:08:30,267 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:08:30,267 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:08:30,272 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:08:30,274 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-22 02:08:30,420 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-22 02:08:30,420 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:08:30,425 WARN L261 TraceCheckSpWp]: Trace formula consists of 370 conjuncts, 218 conjunts are in the unsatisfiable core [2022-11-22 02:08:30,431 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:08:41,176 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:08:41,180 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:08:41,180 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:08:41,182 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:08:41,184 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:08:41,238 INFO L321 Elim1Store]: treesize reduction 20, result has 77.8 percent of original size [2022-11-22 02:08:41,238 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 5 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 97 treesize of output 90 [2022-11-22 02:08:41,520 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 6 proven. 168 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-22 02:08:41,520 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:08:52,362 INFO L321 Elim1Store]: treesize reduction 206, result has 57.3 percent of original size [2022-11-22 02:08:52,363 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 12 select indices, 12 select index equivalence classes, 0 disjoint index pairs (out of 66 index pairs), introduced 12 new quantified variables, introduced 66 case distinctions, treesize of input 102 treesize of output 293 [2022-11-22 02:08:53,725 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 0 proven. 179 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-22 02:08:53,726 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1992190866] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:08:53,726 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1973591306] [2022-11-22 02:08:53,727 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-22 02:08:53,727 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:08:53,727 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:08:53,727 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:08:53,727 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:08:53,743 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:08:53,768 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-22 02:08:53,768 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-22 02:08:53,778 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:08:53,779 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-22 02:08:53,795 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:08:53,798 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-22 02:08:53,837 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:08:53,839 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:08:53,852 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-22 02:08:53,852 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 244 treesize of output 232 [2022-11-22 02:08:53,898 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-22 02:08:54,072 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:08:59,822 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8863#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:08:59,822 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:08:59,823 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:08:59,823 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 37, 40] total 125 [2022-11-22 02:08:59,823 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2052928724] [2022-11-22 02:08:59,823 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:08:59,824 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 125 states [2022-11-22 02:08:59,824 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:08:59,824 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 125 interpolants. [2022-11-22 02:08:59,828 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1014, Invalid=15755, Unknown=1, NotChecked=0, Total=16770 [2022-11-22 02:08:59,828 INFO L87 Difference]: Start difference. First operand 68 states and 76 transitions. Second operand has 125 states, 125 states have (on average 1.512) internal successors, (189), 125 states have internal predecessors, (189), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:09:38,313 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:09:38,313 INFO L93 Difference]: Finished difference Result 294 states and 346 transitions. [2022-11-22 02:09:38,313 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2022-11-22 02:09:38,313 INFO L78 Accepts]: Start accepts. Automaton has has 125 states, 125 states have (on average 1.512) internal successors, (189), 125 states have internal predecessors, (189), 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 67 [2022-11-22 02:09:38,314 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:09:38,315 INFO L225 Difference]: With dead ends: 294 [2022-11-22 02:09:38,315 INFO L226 Difference]: Without dead ends: 178 [2022-11-22 02:09:38,320 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 333 GetRequests, 88 SyntacticMatches, 49 SemanticMatches, 196 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14368 ImplicationChecksByTransitivity, 55.8s TimeCoverageRelationStatistics Valid=3334, Invalid=35671, Unknown=1, NotChecked=0, Total=39006 [2022-11-22 02:09:38,321 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 323 mSDsluCounter, 189 mSDsCounter, 0 mSdLazyCounter, 7102 mSolverCounterSat, 2330 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 323 SdHoareTripleChecker+Valid, 194 SdHoareTripleChecker+Invalid, 9432 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2330 IncrementalHoareTripleChecker+Valid, 7102 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 10.5s IncrementalHoareTripleChecker+Time [2022-11-22 02:09:38,321 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [323 Valid, 194 Invalid, 9432 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2330 Valid, 7102 Invalid, 0 Unknown, 0 Unchecked, 10.5s Time] [2022-11-22 02:09:38,322 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2022-11-22 02:09:38,394 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 118. [2022-11-22 02:09:38,394 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 117 states have (on average 1.1538461538461537) internal successors, (135), 117 states have internal predecessors, (135), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:09:38,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 135 transitions. [2022-11-22 02:09:38,395 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 135 transitions. Word has length 67 [2022-11-22 02:09:38,395 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:09:38,395 INFO L495 AbstractCegarLoop]: Abstraction has 118 states and 135 transitions. [2022-11-22 02:09:38,396 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 125 states, 125 states have (on average 1.512) internal successors, (189), 125 states have internal predecessors, (189), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:09:38,396 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 135 transitions. [2022-11-22 02:09:38,396 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2022-11-22 02:09:38,396 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:09:38,397 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:09:38,404 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2022-11-22 02:09:38,602 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-11-22 02:09:38,603 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:09:38,603 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:09:38,603 INFO L85 PathProgramCache]: Analyzing trace with hash 2013094678, now seen corresponding path program 15 times [2022-11-22 02:09:38,603 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:09:38,603 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1325608551] [2022-11-22 02:09:38,603 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:09:38,603 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:09:38,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:09:38,901 INFO L134 CoverageAnalysis]: Checked inductivity of 203 backedges. 15 proven. 34 refuted. 0 times theorem prover too weak. 154 trivial. 0 not checked. [2022-11-22 02:09:38,901 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:09:38,901 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1325608551] [2022-11-22 02:09:38,902 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1325608551] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:09:38,902 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1995182788] [2022-11-22 02:09:38,902 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:09:38,902 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:09:38,902 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:09:38,907 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:09:38,935 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-22 02:09:39,035 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:09:39,035 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:09:39,037 INFO L263 TraceCheckSpWp]: Trace formula consists of 279 conjuncts, 16 conjunts are in the unsatisfiable core [2022-11-22 02:09:39,039 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:09:39,294 INFO L134 CoverageAnalysis]: Checked inductivity of 203 backedges. 21 proven. 28 refuted. 0 times theorem prover too weak. 154 trivial. 0 not checked. [2022-11-22 02:09:39,294 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:09:39,490 INFO L134 CoverageAnalysis]: Checked inductivity of 203 backedges. 21 proven. 28 refuted. 0 times theorem prover too weak. 154 trivial. 0 not checked. [2022-11-22 02:09:39,490 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1995182788] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:09:39,490 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1092899567] [2022-11-22 02:09:39,492 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-22 02:09:39,492 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:09:39,492 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:09:39,492 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:09:39,493 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:09:39,506 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:09:39,534 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-22 02:09:39,534 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-22 02:09:39,544 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:09:39,545 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-22 02:09:39,567 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:09:39,568 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-22 02:09:39,614 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:09:39,615 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:09:39,639 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-22 02:09:39,639 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-11-22 02:09:39,711 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-22 02:09:39,878 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:09:40,771 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10250#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:09:40,771 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:09:40,771 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:09:40,771 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 32 [2022-11-22 02:09:40,771 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1536040374] [2022-11-22 02:09:40,771 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:09:40,772 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-11-22 02:09:40,772 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:09:40,772 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-11-22 02:09:40,772 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=211, Invalid=1121, Unknown=0, NotChecked=0, Total=1332 [2022-11-22 02:09:40,773 INFO L87 Difference]: Start difference. First operand 118 states and 135 transitions. Second operand has 32 states, 32 states have (on average 1.65625) internal successors, (53), 32 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:09:41,351 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:09:41,352 INFO L93 Difference]: Finished difference Result 170 states and 199 transitions. [2022-11-22 02:09:41,352 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-11-22 02:09:41,352 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.65625) internal successors, (53), 32 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 69 [2022-11-22 02:09:41,352 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:09:41,353 INFO L225 Difference]: With dead ends: 170 [2022-11-22 02:09:41,353 INFO L226 Difference]: Without dead ends: 77 [2022-11-22 02:09:41,353 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 145 SyntacticMatches, 42 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1892 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=393, Invalid=1677, Unknown=0, NotChecked=0, Total=2070 [2022-11-22 02:09:41,354 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 176 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 627 mSolverCounterSat, 247 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 176 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 874 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 247 IncrementalHoareTripleChecker+Valid, 627 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-22 02:09:41,354 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [176 Valid, 19 Invalid, 874 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [247 Valid, 627 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-22 02:09:41,354 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2022-11-22 02:09:41,408 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 77. [2022-11-22 02:09:41,409 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 76 states have (on average 1.118421052631579) internal successors, (85), 76 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:09:41,409 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 85 transitions. [2022-11-22 02:09:41,409 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 85 transitions. Word has length 69 [2022-11-22 02:09:41,409 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:09:41,410 INFO L495 AbstractCegarLoop]: Abstraction has 77 states and 85 transitions. [2022-11-22 02:09:41,410 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 1.65625) internal successors, (53), 32 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:09:41,410 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 85 transitions. [2022-11-22 02:09:41,410 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2022-11-22 02:09:41,410 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:09:41,411 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:09:41,419 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2022-11-22 02:09:41,612 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:09:41,612 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:09:41,613 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:09:41,613 INFO L85 PathProgramCache]: Analyzing trace with hash 1853093538, now seen corresponding path program 16 times [2022-11-22 02:09:41,613 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:09:41,613 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [195371649] [2022-11-22 02:09:41,613 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:09:41,613 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:09:41,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:09:56,185 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 21 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:09:56,185 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:09:56,186 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [195371649] [2022-11-22 02:09:56,186 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [195371649] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:09:56,186 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1135695466] [2022-11-22 02:09:56,186 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 02:09:56,186 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:09:56,187 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:09:56,187 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:09:56,190 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-11-22 02:09:56,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:09:56,325 WARN L261 TraceCheckSpWp]: Trace formula consists of 419 conjuncts, 250 conjunts are in the unsatisfiable core [2022-11-22 02:09:56,330 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:09:56,510 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-22 02:10:00,654 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:10:00,656 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-22 02:10:00,656 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 31 treesize of output 14 [2022-11-22 02:10:00,796 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 252 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:10:00,796 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:10:03,249 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 224 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-11-22 02:10:03,249 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1135695466] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:10:03,249 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1304811459] [2022-11-22 02:10:03,250 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-22 02:10:03,251 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:10:03,251 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:10:03,251 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:10:03,251 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:10:03,270 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:10:03,292 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-22 02:10:03,293 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-11-22 02:10:03,317 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:10:03,342 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-22 02:10:03,343 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-22 02:10:03,361 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:10:03,361 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-22 02:10:03,408 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:10:03,408 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:10:03,431 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-22 02:10:03,432 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-11-22 02:10:03,507 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-22 02:10:03,663 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:10:06,174 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11283#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:10:06,174 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:10:06,174 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:10:06,175 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 27, 19] total 79 [2022-11-22 02:10:06,175 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1197955249] [2022-11-22 02:10:06,175 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:10:06,175 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 79 states [2022-11-22 02:10:06,175 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:10:06,176 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2022-11-22 02:10:06,177 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=398, Invalid=6574, Unknown=0, NotChecked=0, Total=6972 [2022-11-22 02:10:06,177 INFO L87 Difference]: Start difference. First operand 77 states and 85 transitions. Second operand has 79 states, 79 states have (on average 2.3797468354430378) internal successors, (188), 79 states have internal predecessors, (188), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:10:16,538 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:10:16,538 INFO L93 Difference]: Finished difference Result 201 states and 231 transitions. [2022-11-22 02:10:16,539 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2022-11-22 02:10:16,539 INFO L78 Accepts]: Start accepts. Automaton has has 79 states, 79 states have (on average 2.3797468354430378) internal successors, (188), 79 states have internal predecessors, (188), 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 76 [2022-11-22 02:10:16,539 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:10:16,540 INFO L225 Difference]: With dead ends: 201 [2022-11-22 02:10:16,540 INFO L226 Difference]: Without dead ends: 198 [2022-11-22 02:10:16,542 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 340 GetRequests, 149 SyntacticMatches, 70 SemanticMatches, 121 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7225 ImplicationChecksByTransitivity, 17.5s TimeCoverageRelationStatistics Valid=1101, Invalid=13905, Unknown=0, NotChecked=0, Total=15006 [2022-11-22 02:10:16,542 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 68 mSDsluCounter, 92 mSDsCounter, 0 mSdLazyCounter, 4354 mSolverCounterSat, 702 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 68 SdHoareTripleChecker+Valid, 95 SdHoareTripleChecker+Invalid, 5056 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 702 IncrementalHoareTripleChecker+Valid, 4354 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.4s IncrementalHoareTripleChecker+Time [2022-11-22 02:10:16,543 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [68 Valid, 95 Invalid, 5056 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [702 Valid, 4354 Invalid, 0 Unknown, 0 Unchecked, 4.4s Time] [2022-11-22 02:10:16,543 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 198 states. [2022-11-22 02:10:16,636 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 198 to 138. [2022-11-22 02:10:16,637 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 138 states, 137 states have (on average 1.145985401459854) internal successors, (157), 137 states have internal predecessors, (157), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:10:16,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 157 transitions. [2022-11-22 02:10:16,637 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 157 transitions. Word has length 76 [2022-11-22 02:10:16,637 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:10:16,637 INFO L495 AbstractCegarLoop]: Abstraction has 138 states and 157 transitions. [2022-11-22 02:10:16,638 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 79 states, 79 states have (on average 2.3797468354430378) internal successors, (188), 79 states have internal predecessors, (188), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:10:16,638 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 157 transitions. [2022-11-22 02:10:16,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2022-11-22 02:10:16,639 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:10:16,639 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:10:16,648 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-11-22 02:10:16,839 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-11-22 02:10:16,839 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:10:16,839 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:10:16,840 INFO L85 PathProgramCache]: Analyzing trace with hash 1610592622, now seen corresponding path program 17 times [2022-11-22 02:10:16,840 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:10:16,840 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1671049017] [2022-11-22 02:10:16,840 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:10:16,840 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:10:16,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:10:17,140 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 29 proven. 35 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2022-11-22 02:10:17,140 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:10:17,140 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1671049017] [2022-11-22 02:10:17,140 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1671049017] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:10:17,140 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [933812910] [2022-11-22 02:10:17,140 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:10:17,141 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:10:17,141 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:10:17,142 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:10:17,168 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-11-22 02:10:17,331 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-11-22 02:10:17,331 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:10:17,334 INFO L263 TraceCheckSpWp]: Trace formula consists of 424 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-22 02:10:17,336 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:10:17,598 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 36 proven. 28 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2022-11-22 02:10:17,598 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:10:17,829 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 36 proven. 28 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2022-11-22 02:10:17,829 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [933812910] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:10:17,829 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [717602053] [2022-11-22 02:10:17,831 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-22 02:10:17,831 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:10:17,831 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:10:17,832 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:10:17,832 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:10:17,850 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:10:17,873 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-22 02:10:17,873 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-11-22 02:10:17,884 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:10:17,909 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-22 02:10:17,909 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-22 02:10:17,930 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:10:17,931 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-22 02:10:17,972 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:10:17,974 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:10:17,987 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-22 02:10:17,987 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 244 treesize of output 232 [2022-11-22 02:10:18,032 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-22 02:10:18,220 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:10:19,229 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12513#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:10:19,229 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:10:19,229 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:10:19,229 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 29 [2022-11-22 02:10:19,229 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1237584834] [2022-11-22 02:10:19,229 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:10:19,230 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-11-22 02:10:19,230 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:10:19,230 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-11-22 02:10:19,231 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=223, Invalid=899, Unknown=0, NotChecked=0, Total=1122 [2022-11-22 02:10:19,231 INFO L87 Difference]: Start difference. First operand 138 states and 157 transitions. Second operand has 29 states, 29 states have (on average 1.6551724137931034) internal successors, (48), 29 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:10:19,916 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:10:19,917 INFO L93 Difference]: Finished difference Result 324 states and 369 transitions. [2022-11-22 02:10:19,917 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-11-22 02:10:19,917 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.6551724137931034) internal successors, (48), 29 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 77 [2022-11-22 02:10:19,917 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:10:19,918 INFO L225 Difference]: With dead ends: 324 [2022-11-22 02:10:19,918 INFO L226 Difference]: Without dead ends: 139 [2022-11-22 02:10:19,919 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 256 GetRequests, 176 SyntacticMatches, 40 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1339 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=349, Invalid=1373, Unknown=0, NotChecked=0, Total=1722 [2022-11-22 02:10:19,919 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 27 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 658 mSolverCounterSat, 96 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 754 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 96 IncrementalHoareTripleChecker+Valid, 658 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-22 02:10:19,920 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [27 Valid, 17 Invalid, 754 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [96 Valid, 658 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-22 02:10:19,920 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2022-11-22 02:10:20,034 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 139. [2022-11-22 02:10:20,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 139 states, 138 states have (on average 1.144927536231884) internal successors, (158), 138 states have internal predecessors, (158), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:10:20,035 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 158 transitions. [2022-11-22 02:10:20,035 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 158 transitions. Word has length 77 [2022-11-22 02:10:20,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:10:20,035 INFO L495 AbstractCegarLoop]: Abstraction has 139 states and 158 transitions. [2022-11-22 02:10:20,035 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.6551724137931034) internal successors, (48), 29 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:10:20,036 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 158 transitions. [2022-11-22 02:10:20,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2022-11-22 02:10:20,036 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:10:20,036 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:10:20,041 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-11-22 02:10:20,236 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:10:20,237 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:10:20,237 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:10:20,237 INFO L85 PathProgramCache]: Analyzing trace with hash 621213444, now seen corresponding path program 18 times [2022-11-22 02:10:20,237 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:10:20,237 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1232427349] [2022-11-22 02:10:20,237 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:10:20,238 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:10:20,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:10:20,501 INFO L134 CoverageAnalysis]: Checked inductivity of 268 backedges. 21 proven. 43 refuted. 0 times theorem prover too weak. 204 trivial. 0 not checked. [2022-11-22 02:10:20,501 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:10:20,501 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1232427349] [2022-11-22 02:10:20,502 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1232427349] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:10:20,502 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [77920215] [2022-11-22 02:10:20,502 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:10:20,502 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:10:20,502 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:10:20,503 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:10:20,505 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-11-22 02:10:20,624 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:10:20,624 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:10:20,626 INFO L263 TraceCheckSpWp]: Trace formula consists of 319 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-22 02:10:20,627 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:10:21,003 INFO L134 CoverageAnalysis]: Checked inductivity of 268 backedges. 36 proven. 28 refuted. 0 times theorem prover too weak. 204 trivial. 0 not checked. [2022-11-22 02:10:21,003 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:10:21,362 INFO L134 CoverageAnalysis]: Checked inductivity of 268 backedges. 36 proven. 28 refuted. 0 times theorem prover too weak. 204 trivial. 0 not checked. [2022-11-22 02:10:21,363 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [77920215] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:10:21,363 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [617256696] [2022-11-22 02:10:21,364 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-22 02:10:21,364 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:10:21,364 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:10:21,365 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:10:21,365 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:10:21,380 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:10:21,405 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-22 02:10:21,405 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-22 02:10:21,413 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:10:21,414 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-22 02:10:21,431 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:10:21,432 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-22 02:10:21,476 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:10:21,477 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:10:21,502 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-22 02:10:21,502 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-11-22 02:10:21,571 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-22 02:10:21,723 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:10:23,108 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13953#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:10:23,108 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:10:23,109 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:10:23,109 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 44 [2022-11-22 02:10:23,109 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2097671612] [2022-11-22 02:10:23,109 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:10:23,109 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2022-11-22 02:10:23,109 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:10:23,110 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2022-11-22 02:10:23,110 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=303, Invalid=2049, Unknown=0, NotChecked=0, Total=2352 [2022-11-22 02:10:23,110 INFO L87 Difference]: Start difference. First operand 139 states and 158 transitions. Second operand has 44 states, 44 states have (on average 1.7045454545454546) internal successors, (75), 44 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:10:23,701 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:10:23,701 INFO L93 Difference]: Finished difference Result 206 states and 239 transitions. [2022-11-22 02:10:23,701 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-11-22 02:10:23,701 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 1.7045454545454546) internal successors, (75), 44 states have internal predecessors, (75), 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 78 [2022-11-22 02:10:23,701 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:10:23,702 INFO L225 Difference]: With dead ends: 206 [2022-11-22 02:10:23,702 INFO L226 Difference]: Without dead ends: 86 [2022-11-22 02:10:23,703 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 262 GetRequests, 172 SyntacticMatches, 33 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2044 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=520, Invalid=2902, Unknown=0, NotChecked=0, Total=3422 [2022-11-22 02:10:23,703 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 163 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 417 mSolverCounterSat, 188 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 163 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 605 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 188 IncrementalHoareTripleChecker+Valid, 417 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-22 02:10:23,704 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [163 Valid, 19 Invalid, 605 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [188 Valid, 417 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-22 02:10:23,704 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2022-11-22 02:10:23,788 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 86. [2022-11-22 02:10:23,788 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 85 states have (on average 1.1058823529411765) internal successors, (94), 85 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:10:23,788 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 94 transitions. [2022-11-22 02:10:23,788 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 94 transitions. Word has length 78 [2022-11-22 02:10:23,789 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:10:23,789 INFO L495 AbstractCegarLoop]: Abstraction has 86 states and 94 transitions. [2022-11-22 02:10:23,789 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 1.7045454545454546) internal successors, (75), 44 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:10:23,789 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 94 transitions. [2022-11-22 02:10:23,789 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2022-11-22 02:10:23,789 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:10:23,790 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:10:23,803 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-11-22 02:10:23,995 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:10:23,995 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:10:23,995 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:10:23,995 INFO L85 PathProgramCache]: Analyzing trace with hash 1518045775, now seen corresponding path program 19 times [2022-11-22 02:10:23,996 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:10:23,996 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1056078076] [2022-11-22 02:10:23,996 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:10:23,996 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:10:24,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:10:43,324 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 25 proven. 299 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:10:43,324 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:10:43,325 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1056078076] [2022-11-22 02:10:43,325 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1056078076] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:10:43,326 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1420037392] [2022-11-22 02:10:43,326 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 02:10:43,326 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:10:43,326 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:10:43,328 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:10:43,331 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-11-22 02:10:43,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:10:43,487 WARN L261 TraceCheckSpWp]: Trace formula consists of 468 conjuncts, 284 conjunts are in the unsatisfiable core [2022-11-22 02:10:43,490 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:10:43,875 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2022-11-22 02:10:49,327 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:10:49,329 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-22 02:10:49,329 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 14 [2022-11-22 02:10:49,496 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:10:49,496 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:10:52,914 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 288 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-22 02:10:52,914 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1420037392] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:10:52,914 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [415738056] [2022-11-22 02:10:52,916 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-22 02:10:52,916 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:10:52,916 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:10:52,916 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:10:52,916 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:10:52,929 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:10:52,953 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-22 02:10:52,953 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-11-22 02:10:52,964 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:10:52,989 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-22 02:10:52,989 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-22 02:10:53,017 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:10:53,018 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-22 02:10:53,067 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:10:53,072 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:10:53,085 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-22 02:10:53,086 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 244 treesize of output 232 [2022-11-22 02:10:53,126 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-22 02:10:53,276 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:10:56,709 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15147#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:10:56,709 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:10:56,709 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:10:56,710 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 30, 21] total 93 [2022-11-22 02:10:56,710 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1925032326] [2022-11-22 02:10:56,710 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:10:56,710 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 93 states [2022-11-22 02:10:56,710 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:10:56,711 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 93 interpolants. [2022-11-22 02:10:56,712 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=470, Invalid=9036, Unknown=0, NotChecked=0, Total=9506 [2022-11-22 02:10:56,712 INFO L87 Difference]: Start difference. First operand 86 states and 94 transitions. Second operand has 93 states, 93 states have (on average 2.3118279569892475) internal successors, (215), 93 states have internal predecessors, (215), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:11:13,906 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:11:13,907 INFO L93 Difference]: Finished difference Result 321 states and 362 transitions. [2022-11-22 02:11:13,908 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2022-11-22 02:11:13,908 INFO L78 Accepts]: Start accepts. Automaton has has 93 states, 93 states have (on average 2.3118279569892475) internal successors, (215), 93 states have internal predecessors, (215), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 85 [2022-11-22 02:11:13,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:11:13,910 INFO L225 Difference]: With dead ends: 321 [2022-11-22 02:11:13,910 INFO L226 Difference]: Without dead ends: 228 [2022-11-22 02:11:13,911 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 391 GetRequests, 169 SyntacticMatches, 72 SemanticMatches, 150 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9974 ImplicationChecksByTransitivity, 27.0s TimeCoverageRelationStatistics Valid=1640, Invalid=21312, Unknown=0, NotChecked=0, Total=22952 [2022-11-22 02:11:13,912 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 85 mSDsluCounter, 160 mSDsCounter, 0 mSdLazyCounter, 5392 mSolverCounterSat, 1089 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 85 SdHoareTripleChecker+Valid, 165 SdHoareTripleChecker+Invalid, 6481 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1089 IncrementalHoareTripleChecker+Valid, 5392 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.2s IncrementalHoareTripleChecker+Time [2022-11-22 02:11:13,912 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [85 Valid, 165 Invalid, 6481 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1089 Valid, 5392 Invalid, 0 Unknown, 0 Unchecked, 6.2s Time] [2022-11-22 02:11:13,913 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 228 states. [2022-11-22 02:11:14,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 228 to 181. [2022-11-22 02:11:14,104 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 181 states, 180 states have (on average 1.1222222222222222) internal successors, (202), 180 states have internal predecessors, (202), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:11:14,105 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 181 states to 181 states and 202 transitions. [2022-11-22 02:11:14,105 INFO L78 Accepts]: Start accepts. Automaton has 181 states and 202 transitions. Word has length 85 [2022-11-22 02:11:14,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:11:14,105 INFO L495 AbstractCegarLoop]: Abstraction has 181 states and 202 transitions. [2022-11-22 02:11:14,106 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 93 states, 93 states have (on average 2.3118279569892475) internal successors, (215), 93 states have internal predecessors, (215), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:11:14,106 INFO L276 IsEmpty]: Start isEmpty. Operand 181 states and 202 transitions. [2022-11-22 02:11:14,107 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2022-11-22 02:11:14,107 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:11:14,107 INFO L195 NwaCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:11:14,115 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Ended with exit code 0 [2022-11-22 02:11:14,311 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:11:14,311 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:11:14,311 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:11:14,311 INFO L85 PathProgramCache]: Analyzing trace with hash -375630095, now seen corresponding path program 20 times [2022-11-22 02:11:14,311 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:11:14,311 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [311192691] [2022-11-22 02:11:14,311 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:11:14,312 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:11:14,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:11:14,728 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 28 proven. 53 refuted. 0 times theorem prover too weak. 261 trivial. 0 not checked. [2022-11-22 02:11:14,729 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:11:14,729 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [311192691] [2022-11-22 02:11:14,729 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [311192691] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:11:14,729 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [428524042] [2022-11-22 02:11:14,729 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:11:14,729 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:11:14,729 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:11:14,730 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:11:14,732 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-11-22 02:11:14,958 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-11-22 02:11:14,958 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:11:14,962 INFO L263 TraceCheckSpWp]: Trace formula consists of 482 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-22 02:11:14,964 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:11:15,319 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 36 proven. 45 refuted. 0 times theorem prover too weak. 261 trivial. 0 not checked. [2022-11-22 02:11:15,320 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:11:15,606 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 36 proven. 45 refuted. 0 times theorem prover too weak. 261 trivial. 0 not checked. [2022-11-22 02:11:15,606 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [428524042] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:11:15,606 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [41315537] [2022-11-22 02:11:15,608 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-22 02:11:15,608 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:11:15,608 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:11:15,608 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:11:15,608 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:11:15,624 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:11:15,646 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-22 02:11:15,646 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-11-22 02:11:15,656 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:11:15,680 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-22 02:11:15,681 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-22 02:11:15,699 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:11:15,700 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-22 02:11:15,738 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:11:15,740 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:11:15,753 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-22 02:11:15,753 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 244 treesize of output 232 [2022-11-22 02:11:15,790 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-22 02:11:15,943 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:11:17,419 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16801#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:11:17,420 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:11:17,420 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:11:17,420 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 40 [2022-11-22 02:11:17,420 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1763238512] [2022-11-22 02:11:17,420 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:11:17,421 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-11-22 02:11:17,421 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:11:17,421 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-11-22 02:11:17,422 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=308, Invalid=1672, Unknown=0, NotChecked=0, Total=1980 [2022-11-22 02:11:17,422 INFO L87 Difference]: Start difference. First operand 181 states and 202 transitions. Second operand has 40 states, 40 states have (on average 1.975) internal successors, (79), 40 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:11:18,151 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:11:18,152 INFO L93 Difference]: Finished difference Result 246 states and 280 transitions. [2022-11-22 02:11:18,153 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-11-22 02:11:18,153 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.975) internal successors, (79), 40 states have internal predecessors, (79), 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 87 [2022-11-22 02:11:18,153 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:11:18,154 INFO L225 Difference]: With dead ends: 246 [2022-11-22 02:11:18,154 INFO L226 Difference]: Without dead ends: 95 [2022-11-22 02:11:18,155 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 301 GetRequests, 183 SyntacticMatches, 64 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3526 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=585, Invalid=2495, Unknown=0, NotChecked=0, Total=3080 [2022-11-22 02:11:18,155 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 313 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 637 mSolverCounterSat, 391 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 313 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 1028 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 391 IncrementalHoareTripleChecker+Valid, 637 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-22 02:11:18,156 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [313 Valid, 13 Invalid, 1028 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [391 Valid, 637 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-22 02:11:18,156 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2022-11-22 02:11:18,254 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 95. [2022-11-22 02:11:18,254 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 94 states have (on average 1.0957446808510638) internal successors, (103), 94 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:11:18,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 103 transitions. [2022-11-22 02:11:18,255 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 103 transitions. Word has length 87 [2022-11-22 02:11:18,255 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:11:18,255 INFO L495 AbstractCegarLoop]: Abstraction has 95 states and 103 transitions. [2022-11-22 02:11:18,255 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 1.975) internal successors, (79), 40 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:11:18,256 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 103 transitions. [2022-11-22 02:11:18,256 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2022-11-22 02:11:18,256 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:11:18,256 INFO L195 NwaCegarLoop]: trace histogram [9, 9, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:11:18,267 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-11-22 02:11:18,463 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:11:18,464 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:11:18,464 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:11:18,464 INFO L85 PathProgramCache]: Analyzing trace with hash -1520980926, now seen corresponding path program 21 times [2022-11-22 02:11:18,464 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:11:18,464 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1170275678] [2022-11-22 02:11:18,464 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:11:18,465 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:11:18,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:11:44,626 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 42 proven. 363 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:11:44,626 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:11:44,626 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1170275678] [2022-11-22 02:11:44,626 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1170275678] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:11:44,627 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [314705260] [2022-11-22 02:11:44,627 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:11:44,627 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:11:44,627 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:11:44,628 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:11:44,630 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-11-22 02:11:44,803 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:11:44,803 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:11:44,809 WARN L261 TraceCheckSpWp]: Trace formula consists of 517 conjuncts, 318 conjunts are in the unsatisfiable core [2022-11-22 02:11:44,813 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:11:44,992 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2022-11-22 02:11:51,311 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 0 proven. 405 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:11:51,311 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:11:55,736 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 0 proven. 360 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2022-11-22 02:11:55,736 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [314705260] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:11:55,736 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [103418023] [2022-11-22 02:11:55,738 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-22 02:11:55,738 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:11:55,738 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:11:55,738 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:11:55,738 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:11:55,753 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:11:55,776 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-22 02:11:55,777 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-11-22 02:11:55,792 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:11:55,827 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-22 02:11:55,827 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-22 02:11:55,850 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:11:55,852 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-22 02:11:55,910 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:11:55,913 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:11:55,926 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-22 02:11:55,926 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 244 treesize of output 232 [2022-11-22 02:11:55,966 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-22 02:11:56,124 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:12:00,270 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '18166#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:12:00,270 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:12:00,270 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:12:00,270 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [76, 33, 23] total 101 [2022-11-22 02:12:00,271 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [626210750] [2022-11-22 02:12:00,271 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:12:00,271 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 101 states [2022-11-22 02:12:00,271 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:12:00,272 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2022-11-22 02:12:00,273 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=485, Invalid=10645, Unknown=0, NotChecked=0, Total=11130 [2022-11-22 02:12:00,273 INFO L87 Difference]: Start difference. First operand 95 states and 103 transitions. Second operand has 101 states, 101 states have (on average 2.3267326732673266) internal successors, (235), 101 states have internal predecessors, (235), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:12:26,004 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:12:26,004 INFO L93 Difference]: Finished difference Result 270 states and 309 transitions. [2022-11-22 02:12:26,004 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2022-11-22 02:12:26,005 INFO L78 Accepts]: Start accepts. Automaton has has 101 states, 101 states have (on average 2.3267326732673266) internal successors, (235), 101 states have internal predecessors, (235), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 94 [2022-11-22 02:12:26,005 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:12:26,006 INFO L225 Difference]: With dead ends: 270 [2022-11-22 02:12:26,006 INFO L226 Difference]: Without dead ends: 267 [2022-11-22 02:12:26,008 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 437 GetRequests, 195 SyntacticMatches, 74 SemanticMatches, 168 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11804 ImplicationChecksByTransitivity, 35.6s TimeCoverageRelationStatistics Valid=1904, Invalid=26826, Unknown=0, NotChecked=0, Total=28730 [2022-11-22 02:12:26,009 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 98 mSDsluCounter, 84 mSDsCounter, 0 mSdLazyCounter, 6563 mSolverCounterSat, 1393 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 98 SdHoareTripleChecker+Valid, 87 SdHoareTripleChecker+Invalid, 7956 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1393 IncrementalHoareTripleChecker+Valid, 6563 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.8s IncrementalHoareTripleChecker+Time [2022-11-22 02:12:26,010 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [98 Valid, 87 Invalid, 7956 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1393 Valid, 6563 Invalid, 0 Unknown, 0 Unchecked, 8.8s Time] [2022-11-22 02:12:26,010 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 267 states. [2022-11-22 02:12:26,191 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 267 to 161. [2022-11-22 02:12:26,191 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 161 states, 160 states have (on average 1.125) internal successors, (180), 160 states have internal predecessors, (180), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:12:26,192 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 161 states to 161 states and 180 transitions. [2022-11-22 02:12:26,192 INFO L78 Accepts]: Start accepts. Automaton has 161 states and 180 transitions. Word has length 94 [2022-11-22 02:12:26,192 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:12:26,192 INFO L495 AbstractCegarLoop]: Abstraction has 161 states and 180 transitions. [2022-11-22 02:12:26,193 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 101 states, 101 states have (on average 2.3267326732673266) internal successors, (235), 101 states have internal predecessors, (235), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:12:26,193 INFO L276 IsEmpty]: Start isEmpty. Operand 161 states and 180 transitions. [2022-11-22 02:12:26,193 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2022-11-22 02:12:26,194 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:12:26,194 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:12:26,199 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2022-11-22 02:12:26,395 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2022-11-22 02:12:26,395 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:12:26,395 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:12:26,395 INFO L85 PathProgramCache]: Analyzing trace with hash 93499342, now seen corresponding path program 22 times [2022-11-22 02:12:26,395 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:12:26,396 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1894674940] [2022-11-22 02:12:26,396 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:12:26,396 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:12:26,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:12:26,983 INFO L134 CoverageAnalysis]: Checked inductivity of 415 backedges. 46 proven. 54 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2022-11-22 02:12:26,983 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:12:26,983 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1894674940] [2022-11-22 02:12:26,983 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1894674940] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:12:26,983 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2069617150] [2022-11-22 02:12:26,983 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 02:12:26,983 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:12:26,984 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:12:26,985 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:12:26,996 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-11-22 02:12:27,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:12:27,171 INFO L263 TraceCheckSpWp]: Trace formula consists of 522 conjuncts, 22 conjunts are in the unsatisfiable core [2022-11-22 02:12:27,174 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:12:27,528 INFO L134 CoverageAnalysis]: Checked inductivity of 415 backedges. 55 proven. 45 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2022-11-22 02:12:27,528 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:12:27,838 INFO L134 CoverageAnalysis]: Checked inductivity of 415 backedges. 55 proven. 45 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2022-11-22 02:12:27,839 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2069617150] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:12:27,839 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1398137366] [2022-11-22 02:12:27,840 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-22 02:12:27,840 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:12:27,840 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:12:27,840 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:12:27,840 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:12:27,854 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:12:27,879 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-22 02:12:27,880 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-11-22 02:12:27,891 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:12:27,917 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-22 02:12:27,917 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-22 02:12:27,938 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:12:27,938 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-22 02:12:27,977 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:12:27,979 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:12:27,992 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-22 02:12:27,993 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 244 treesize of output 232 [2022-11-22 02:12:28,031 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-22 02:12:28,190 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:12:29,550 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '19741#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:12:29,550 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:12:29,551 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:12:29,551 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 35 [2022-11-22 02:12:29,551 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1308932381] [2022-11-22 02:12:29,551 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:12:29,552 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-11-22 02:12:29,552 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:12:29,552 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-11-22 02:12:29,553 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=313, Invalid=1247, Unknown=0, NotChecked=0, Total=1560 [2022-11-22 02:12:29,553 INFO L87 Difference]: Start difference. First operand 161 states and 180 transitions. Second operand has 35 states, 35 states have (on average 1.542857142857143) internal successors, (54), 35 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:12:30,462 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:12:30,462 INFO L93 Difference]: Finished difference Result 381 states and 425 transitions. [2022-11-22 02:12:30,470 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-11-22 02:12:30,470 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.542857142857143) internal successors, (54), 35 states have internal predecessors, (54), 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 95 [2022-11-22 02:12:30,470 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:12:30,471 INFO L225 Difference]: With dead ends: 381 [2022-11-22 02:12:30,471 INFO L226 Difference]: Without dead ends: 162 [2022-11-22 02:12:30,472 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 316 GetRequests, 218 SyntacticMatches, 50 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1993 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=500, Invalid=1950, Unknown=0, NotChecked=0, Total=2450 [2022-11-22 02:12:30,472 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 33 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 734 mSolverCounterSat, 127 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 861 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 127 IncrementalHoareTripleChecker+Valid, 734 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-22 02:12:30,473 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [33 Valid, 23 Invalid, 861 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [127 Valid, 734 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-22 02:12:30,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2022-11-22 02:12:30,616 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 162. [2022-11-22 02:12:30,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 162 states, 161 states have (on average 1.124223602484472) internal successors, (181), 161 states have internal predecessors, (181), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:12:30,617 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 181 transitions. [2022-11-22 02:12:30,617 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 181 transitions. Word has length 95 [2022-11-22 02:12:30,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:12:30,618 INFO L495 AbstractCegarLoop]: Abstraction has 162 states and 181 transitions. [2022-11-22 02:12:30,618 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.542857142857143) internal successors, (54), 35 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:12:30,618 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 181 transitions. [2022-11-22 02:12:30,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2022-11-22 02:12:30,619 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:12:30,619 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:12:30,626 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2022-11-22 02:12:30,826 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2022-11-22 02:12:30,826 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:12:30,826 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:12:30,827 INFO L85 PathProgramCache]: Analyzing trace with hash -1526203420, now seen corresponding path program 23 times [2022-11-22 02:12:30,827 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:12:30,828 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1897108370] [2022-11-22 02:12:30,828 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:12:30,828 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:12:30,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:12:31,227 INFO L134 CoverageAnalysis]: Checked inductivity of 425 backedges. 36 proven. 64 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2022-11-22 02:12:31,228 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:12:31,228 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1897108370] [2022-11-22 02:12:31,228 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1897108370] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:12:31,228 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1847184079] [2022-11-22 02:12:31,228 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:12:31,229 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:12:31,229 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:12:31,229 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:12:31,232 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-11-22 02:12:31,561 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-11-22 02:12:31,561 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:12:31,565 INFO L263 TraceCheckSpWp]: Trace formula consists of 531 conjuncts, 22 conjunts are in the unsatisfiable core [2022-11-22 02:12:31,567 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:12:31,789 INFO L134 CoverageAnalysis]: Checked inductivity of 425 backedges. 45 proven. 55 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2022-11-22 02:12:31,789 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:12:32,001 INFO L134 CoverageAnalysis]: Checked inductivity of 425 backedges. 45 proven. 55 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2022-11-22 02:12:32,002 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1847184079] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:12:32,002 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1910158161] [2022-11-22 02:12:32,003 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-22 02:12:32,003 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:12:32,003 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:12:32,004 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:12:32,004 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:12:32,018 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:12:32,041 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-22 02:12:32,042 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-11-22 02:12:32,052 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:12:32,076 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-22 02:12:32,076 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-22 02:12:32,097 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:12:32,097 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-22 02:12:32,141 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:12:32,143 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:12:32,155 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-22 02:12:32,155 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 244 treesize of output 232 [2022-11-22 02:12:32,194 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-22 02:12:32,345 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:12:33,190 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '21444#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:12:33,190 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:12:33,190 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:12:33,190 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 35 [2022-11-22 02:12:33,190 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1642596416] [2022-11-22 02:12:33,190 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:12:33,191 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-11-22 02:12:33,191 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:12:33,191 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-11-22 02:12:33,192 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=309, Invalid=1251, Unknown=0, NotChecked=0, Total=1560 [2022-11-22 02:12:33,192 INFO L87 Difference]: Start difference. First operand 162 states and 181 transitions. Second operand has 35 states, 35 states have (on average 1.542857142857143) internal successors, (54), 35 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:12:33,837 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:12:33,837 INFO L93 Difference]: Finished difference Result 243 states and 276 transitions. [2022-11-22 02:12:33,837 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-11-22 02:12:33,837 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.542857142857143) internal successors, (54), 35 states have internal predecessors, (54), 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 96 [2022-11-22 02:12:33,838 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:12:33,838 INFO L225 Difference]: With dead ends: 243 [2022-11-22 02:12:33,838 INFO L226 Difference]: Without dead ends: 115 [2022-11-22 02:12:33,839 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 320 GetRequests, 231 SyntacticMatches, 40 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1963 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=618, Invalid=1932, Unknown=0, NotChecked=0, Total=2550 [2022-11-22 02:12:33,839 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 233 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 249 mSolverCounterSat, 252 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 233 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 501 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 252 IncrementalHoareTripleChecker+Valid, 249 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-22 02:12:33,839 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [233 Valid, 9 Invalid, 501 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [252 Valid, 249 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-22 02:12:33,840 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2022-11-22 02:12:33,947 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 104. [2022-11-22 02:12:33,948 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 103 states have (on average 1.087378640776699) internal successors, (112), 103 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:12:33,949 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 112 transitions. [2022-11-22 02:12:33,949 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 112 transitions. Word has length 96 [2022-11-22 02:12:33,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:12:33,949 INFO L495 AbstractCegarLoop]: Abstraction has 104 states and 112 transitions. [2022-11-22 02:12:33,949 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.542857142857143) internal successors, (54), 35 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:12:33,950 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 112 transitions. [2022-11-22 02:12:33,950 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2022-11-22 02:12:33,950 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:12:33,951 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:12:33,963 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2022-11-22 02:12:34,157 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:12:34,158 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:12:34,158 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:12:34,158 INFO L85 PathProgramCache]: Analyzing trace with hash -166367441, now seen corresponding path program 24 times [2022-11-22 02:12:34,158 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:12:34,158 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1617553422] [2022-11-22 02:12:34,158 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:12:34,159 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:12:34,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:13:04,480 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 77 proven. 418 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:13:04,481 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:13:04,481 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1617553422] [2022-11-22 02:13:04,481 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1617553422] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:13:04,481 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1515233451] [2022-11-22 02:13:04,481 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:13:04,481 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:13:04,481 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:13:04,482 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:13:04,487 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-11-22 02:13:04,679 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:13:04,679 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:13:04,685 WARN L261 TraceCheckSpWp]: Trace formula consists of 566 conjuncts, 354 conjunts are in the unsatisfiable core [2022-11-22 02:13:04,690 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:13:05,645 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2022-11-22 02:13:16,057 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:13:16,057 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:13:22,509 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 440 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-11-22 02:13:22,509 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1515233451] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:13:22,509 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1166450597] [2022-11-22 02:13:22,510 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-22 02:13:22,510 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:13:22,510 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:13:22,511 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:13:22,511 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:13:22,525 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:13:22,548 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-22 02:13:22,548 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-11-22 02:13:22,561 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:13:22,587 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-22 02:13:22,588 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-22 02:13:22,608 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:13:22,609 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-22 02:13:22,649 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:13:22,650 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:13:22,674 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-22 02:13:22,674 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-11-22 02:13:22,742 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-22 02:13:22,915 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:13:30,942 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '22878#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:13:30,942 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:13:30,943 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:13:30,943 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [83, 36, 25] total 114 [2022-11-22 02:13:30,943 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [456657931] [2022-11-22 02:13:30,943 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:13:30,944 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 114 states [2022-11-22 02:13:30,944 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:13:30,944 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 114 interpolants. [2022-11-22 02:13:30,945 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=578, Invalid=13464, Unknown=0, NotChecked=0, Total=14042 [2022-11-22 02:13:30,945 INFO L87 Difference]: Start difference. First operand 104 states and 112 transitions. Second operand has 114 states, 114 states have (on average 2.2719298245614037) internal successors, (259), 114 states have internal predecessors, (259), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:13:57,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:13:57,009 INFO L93 Difference]: Finished difference Result 208 states and 236 transitions. [2022-11-22 02:13:57,010 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2022-11-22 02:13:57,010 INFO L78 Accepts]: Start accepts. Automaton has has 114 states, 114 states have (on average 2.2719298245614037) internal successors, (259), 114 states have internal predecessors, (259), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 103 [2022-11-22 02:13:57,010 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:13:57,011 INFO L225 Difference]: With dead ends: 208 [2022-11-22 02:13:57,011 INFO L226 Difference]: Without dead ends: 205 [2022-11-22 02:13:57,013 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 465 GetRequests, 172 SyntacticMatches, 120 SemanticMatches, 173 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15075 ImplicationChecksByTransitivity, 49.3s TimeCoverageRelationStatistics Valid=1960, Invalid=28490, Unknown=0, NotChecked=0, Total=30450 [2022-11-22 02:13:57,014 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 139 mSDsluCounter, 94 mSDsCounter, 0 mSdLazyCounter, 7049 mSolverCounterSat, 1661 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 139 SdHoareTripleChecker+Valid, 97 SdHoareTripleChecker+Invalid, 8710 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1661 IncrementalHoareTripleChecker+Valid, 7049 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 9.4s IncrementalHoareTripleChecker+Time [2022-11-22 02:13:57,014 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [139 Valid, 97 Invalid, 8710 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1661 Valid, 7049 Invalid, 0 Unknown, 0 Unchecked, 9.4s Time] [2022-11-22 02:13:57,015 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205 states. [2022-11-22 02:13:57,140 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 105. [2022-11-22 02:13:57,141 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 105 states, 104 states have (on average 1.0865384615384615) internal successors, (113), 104 states have internal predecessors, (113), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:13:57,141 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 113 transitions. [2022-11-22 02:13:57,141 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 113 transitions. Word has length 103 [2022-11-22 02:13:57,142 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:13:57,142 INFO L495 AbstractCegarLoop]: Abstraction has 105 states and 113 transitions. [2022-11-22 02:13:57,142 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 114 states, 114 states have (on average 2.2719298245614037) internal successors, (259), 114 states have internal predecessors, (259), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:13:57,142 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 113 transitions. [2022-11-22 02:13:57,142 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2022-11-22 02:13:57,142 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:13:57,143 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:13:57,155 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2022-11-22 02:13:57,349 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2022-11-22 02:13:57,349 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:13:57,349 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:13:57,349 INFO L85 PathProgramCache]: Analyzing trace with hash -863155583, now seen corresponding path program 25 times [2022-11-22 02:13:57,349 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:13:57,349 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [353214363] [2022-11-22 02:13:57,350 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:13:57,350 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:13:57,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:13:57,774 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 56 proven. 65 refuted. 0 times theorem prover too weak. 385 trivial. 0 not checked. [2022-11-22 02:13:57,774 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:13:57,774 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [353214363] [2022-11-22 02:13:57,774 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [353214363] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:13:57,775 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [660854099] [2022-11-22 02:13:57,775 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 02:13:57,775 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:13:57,775 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:13:57,777 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:13:57,780 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-11-22 02:13:57,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:13:57,958 INFO L263 TraceCheckSpWp]: Trace formula consists of 571 conjuncts, 24 conjunts are in the unsatisfiable core [2022-11-22 02:13:57,959 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:13:58,328 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 66 proven. 55 refuted. 0 times theorem prover too weak. 385 trivial. 0 not checked. [2022-11-22 02:13:58,328 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:13:58,641 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 66 proven. 55 refuted. 0 times theorem prover too weak. 385 trivial. 0 not checked. [2022-11-22 02:13:58,641 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [660854099] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:13:58,641 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1842349883] [2022-11-22 02:13:58,643 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-22 02:13:58,643 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:13:58,643 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:13:58,643 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:13:58,643 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:13:58,657 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:13:58,682 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-22 02:13:58,682 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-22 02:13:58,693 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:13:58,694 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-22 02:13:58,713 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:13:58,714 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-22 02:13:58,749 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:13:58,751 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:13:58,768 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-22 02:13:58,768 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 244 treesize of output 232 [2022-11-22 02:13:58,807 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-22 02:13:58,958 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:14:00,077 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '24261#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:14:00,077 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:14:00,077 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:14:00,078 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 38 [2022-11-22 02:14:00,078 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2024746419] [2022-11-22 02:14:00,078 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:14:00,078 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-11-22 02:14:00,078 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:14:00,079 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-11-22 02:14:00,079 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=364, Invalid=1442, Unknown=0, NotChecked=0, Total=1806 [2022-11-22 02:14:00,079 INFO L87 Difference]: Start difference. First operand 105 states and 113 transitions. Second operand has 38 states, 38 states have (on average 1.5) internal successors, (57), 38 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:14:01,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:14:01,059 INFO L93 Difference]: Finished difference Result 276 states and 299 transitions. [2022-11-22 02:14:01,059 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-11-22 02:14:01,060 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.5) internal successors, (57), 38 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 104 [2022-11-22 02:14:01,060 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:14:01,060 INFO L225 Difference]: With dead ends: 276 [2022-11-22 02:14:01,061 INFO L226 Difference]: Without dead ends: 106 [2022-11-22 02:14:01,061 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 346 GetRequests, 250 SyntacticMatches, 44 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1972 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=586, Invalid=2276, Unknown=0, NotChecked=0, Total=2862 [2022-11-22 02:14:01,062 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 33 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 719 mSolverCounterSat, 137 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 856 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 137 IncrementalHoareTripleChecker+Valid, 719 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-22 02:14:01,062 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [33 Valid, 17 Invalid, 856 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [137 Valid, 719 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-22 02:14:01,063 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2022-11-22 02:14:01,260 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 106. [2022-11-22 02:14:01,260 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 105 states have (on average 1.0857142857142856) internal successors, (114), 105 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:14:01,260 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 114 transitions. [2022-11-22 02:14:01,260 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 114 transitions. Word has length 104 [2022-11-22 02:14:01,261 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:14:01,261 INFO L495 AbstractCegarLoop]: Abstraction has 106 states and 114 transitions. [2022-11-22 02:14:01,261 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 1.5) internal successors, (57), 38 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:14:01,261 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 114 transitions. [2022-11-22 02:14:01,261 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2022-11-22 02:14:01,261 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:14:01,262 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:14:01,266 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2022-11-22 02:14:01,462 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2022-11-22 02:14:01,462 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:14:01,462 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:14:01,462 INFO L85 PathProgramCache]: Analyzing trace with hash -1935853781, now seen corresponding path program 26 times [2022-11-22 02:14:01,463 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:14:01,463 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1302391582] [2022-11-22 02:14:01,463 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:14:01,463 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:14:01,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:14:01,906 INFO L134 CoverageAnalysis]: Checked inductivity of 517 backedges. 45 proven. 76 refuted. 0 times theorem prover too weak. 396 trivial. 0 not checked. [2022-11-22 02:14:01,906 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:14:01,906 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1302391582] [2022-11-22 02:14:01,906 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1302391582] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:14:01,906 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [134378480] [2022-11-22 02:14:01,906 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:14:01,906 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:14:01,907 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:14:01,907 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:14:01,910 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2022-11-22 02:14:02,230 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2022-11-22 02:14:02,230 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:14:02,235 INFO L263 TraceCheckSpWp]: Trace formula consists of 580 conjuncts, 24 conjunts are in the unsatisfiable core [2022-11-22 02:14:02,236 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:14:02,790 INFO L134 CoverageAnalysis]: Checked inductivity of 517 backedges. 66 proven. 55 refuted. 0 times theorem prover too weak. 396 trivial. 0 not checked. [2022-11-22 02:14:02,790 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:14:03,342 INFO L134 CoverageAnalysis]: Checked inductivity of 517 backedges. 66 proven. 55 refuted. 0 times theorem prover too weak. 396 trivial. 0 not checked. [2022-11-22 02:14:03,342 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [134378480] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:14:03,342 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1946064493] [2022-11-22 02:14:03,343 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-22 02:14:03,344 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:14:03,344 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:14:03,344 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:14:03,344 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:14:03,357 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:14:03,381 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-22 02:14:03,382 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-22 02:14:03,390 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:14:03,391 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-22 02:14:03,409 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:14:03,409 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-22 02:14:03,446 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:14:03,448 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:14:03,460 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-22 02:14:03,461 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 244 treesize of output 232 [2022-11-22 02:14:03,498 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-22 02:14:03,650 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:14:06,428 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '25722#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:14:06,428 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:14:06,428 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:14:06,429 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 59 [2022-11-22 02:14:06,429 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1377721374] [2022-11-22 02:14:06,429 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:14:06,429 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2022-11-22 02:14:06,429 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:14:06,430 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2022-11-22 02:14:06,430 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=507, Invalid=3525, Unknown=0, NotChecked=0, Total=4032 [2022-11-22 02:14:06,430 INFO L87 Difference]: Start difference. First operand 106 states and 114 transitions. Second operand has 59 states, 59 states have (on average 1.5254237288135593) internal successors, (90), 59 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:14:07,392 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:14:07,392 INFO L93 Difference]: Finished difference Result 194 states and 215 transitions. [2022-11-22 02:14:07,392 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-11-22 02:14:07,393 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 1.5254237288135593) internal successors, (90), 59 states have internal predecessors, (90), 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 105 [2022-11-22 02:14:07,393 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:14:07,393 INFO L225 Difference]: With dead ends: 194 [2022-11-22 02:14:07,393 INFO L226 Difference]: Without dead ends: 113 [2022-11-22 02:14:07,394 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 363 GetRequests, 220 SyntacticMatches, 68 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5009 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=886, Invalid=4966, Unknown=0, NotChecked=0, Total=5852 [2022-11-22 02:14:07,395 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 318 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 501 mSolverCounterSat, 409 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 318 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 910 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 409 IncrementalHoareTripleChecker+Valid, 501 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-22 02:14:07,395 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [318 Valid, 23 Invalid, 910 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [409 Valid, 501 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-22 02:14:07,395 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2022-11-22 02:14:07,532 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 113. [2022-11-22 02:14:07,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 113 states, 112 states have (on average 1.0803571428571428) internal successors, (121), 112 states have internal predecessors, (121), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:14:07,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 121 transitions. [2022-11-22 02:14:07,533 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 121 transitions. Word has length 105 [2022-11-22 02:14:07,533 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:14:07,533 INFO L495 AbstractCegarLoop]: Abstraction has 113 states and 121 transitions. [2022-11-22 02:14:07,534 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 59 states, 59 states have (on average 1.5254237288135593) internal successors, (90), 59 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:14:07,534 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 121 transitions. [2022-11-22 02:14:07,534 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2022-11-22 02:14:07,535 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:14:07,535 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 11, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:14:07,543 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2022-11-22 02:14:07,742 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:14:07,743 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:14:07,743 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:14:07,743 INFO L85 PathProgramCache]: Analyzing trace with hash -676144670, now seen corresponding path program 27 times [2022-11-22 02:14:07,743 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:14:07,743 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1678815491] [2022-11-22 02:14:07,743 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:14:07,743 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:14:08,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:14:39,390 INFO L134 CoverageAnalysis]: Checked inductivity of 594 backedges. 93 proven. 501 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:14:39,390 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:14:39,390 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1678815491] [2022-11-22 02:14:39,390 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1678815491] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:14:39,390 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [619434972] [2022-11-22 02:14:39,390 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:14:39,390 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:14:39,390 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:14:39,393 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:14:39,399 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2022-11-22 02:14:39,602 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:14:39,603 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:14:39,609 WARN L261 TraceCheckSpWp]: Trace formula consists of 615 conjuncts, 386 conjunts are in the unsatisfiable core [2022-11-22 02:14:39,613 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:14:40,526 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2022-11-22 02:14:50,034 INFO L134 CoverageAnalysis]: Checked inductivity of 594 backedges. 0 proven. 594 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:14:50,035 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:14:56,671 INFO L134 CoverageAnalysis]: Checked inductivity of 594 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2022-11-22 02:14:56,672 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [619434972] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:14:56,672 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [305811298] [2022-11-22 02:14:56,673 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-22 02:14:56,673 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:14:56,673 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:14:56,673 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:14:56,674 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:14:56,694 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:14:56,720 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-22 02:14:56,721 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-11-22 02:14:56,733 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:14:56,763 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-22 02:14:56,763 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-22 02:14:56,783 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:14:56,784 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-22 02:14:56,830 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:14:56,831 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:14:56,853 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-22 02:14:56,853 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-11-22 02:14:56,921 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-22 02:14:57,080 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:15:06,324 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '27160#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:15:06,324 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:15:06,324 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:15:06,324 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [95, 39, 27] total 128 [2022-11-22 02:15:06,324 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [265610138] [2022-11-22 02:15:06,324 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:15:06,325 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 128 states [2022-11-22 02:15:06,325 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:15:06,325 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 128 interpolants. [2022-11-22 02:15:06,326 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=705, Invalid=16851, Unknown=0, NotChecked=0, Total=17556 [2022-11-22 02:15:06,327 INFO L87 Difference]: Start difference. First operand 113 states and 121 transitions. Second operand has 128 states, 128 states have (on average 2.2265625) internal successors, (285), 128 states have internal predecessors, (285), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:15:33,239 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:15:33,239 INFO L93 Difference]: Finished difference Result 224 states and 252 transitions. [2022-11-22 02:15:33,240 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2022-11-22 02:15:33,240 INFO L78 Accepts]: Start accepts. Automaton has has 128 states, 128 states have (on average 2.2265625) internal successors, (285), 128 states have internal predecessors, (285), 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 112 [2022-11-22 02:15:33,240 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:15:33,241 INFO L225 Difference]: With dead ends: 224 [2022-11-22 02:15:33,241 INFO L226 Difference]: Without dead ends: 221 [2022-11-22 02:15:33,244 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 505 GetRequests, 182 SyntacticMatches, 132 SemanticMatches, 191 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20658 ImplicationChecksByTransitivity, 50.5s TimeCoverageRelationStatistics Valid=2306, Invalid=34750, Unknown=0, NotChecked=0, Total=37056 [2022-11-22 02:15:33,244 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 130 mSDsluCounter, 102 mSDsCounter, 0 mSdLazyCounter, 8076 mSolverCounterSat, 1751 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 130 SdHoareTripleChecker+Valid, 105 SdHoareTripleChecker+Invalid, 9827 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1751 IncrementalHoareTripleChecker+Valid, 8076 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 9.9s IncrementalHoareTripleChecker+Time [2022-11-22 02:15:33,245 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [130 Valid, 105 Invalid, 9827 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1751 Valid, 8076 Invalid, 0 Unknown, 0 Unchecked, 9.9s Time] [2022-11-22 02:15:33,245 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 221 states. [2022-11-22 02:15:33,401 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 221 to 114. [2022-11-22 02:15:33,401 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 114 states, 113 states have (on average 1.079646017699115) internal successors, (122), 113 states have internal predecessors, (122), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:15:33,402 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 122 transitions. [2022-11-22 02:15:33,402 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 122 transitions. Word has length 112 [2022-11-22 02:15:33,402 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:15:33,402 INFO L495 AbstractCegarLoop]: Abstraction has 114 states and 122 transitions. [2022-11-22 02:15:33,402 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 128 states, 128 states have (on average 2.2265625) internal successors, (285), 128 states have internal predecessors, (285), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:15:33,403 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 122 transitions. [2022-11-22 02:15:33,403 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2022-11-22 02:15:33,403 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:15:33,404 INFO L195 NwaCegarLoop]: trace histogram [12, 11, 11, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:15:33,414 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2022-11-22 02:15:33,610 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2022-11-22 02:15:33,610 INFO L420 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:15:33,610 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:15:33,610 INFO L85 PathProgramCache]: Analyzing trace with hash 513619502, now seen corresponding path program 28 times [2022-11-22 02:15:33,610 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:15:33,611 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1970060371] [2022-11-22 02:15:33,611 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:15:33,611 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:15:33,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:15:34,124 INFO L134 CoverageAnalysis]: Checked inductivity of 606 backedges. 67 proven. 77 refuted. 0 times theorem prover too weak. 462 trivial. 0 not checked. [2022-11-22 02:15:34,124 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:15:34,124 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1970060371] [2022-11-22 02:15:34,124 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1970060371] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:15:34,124 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1800505286] [2022-11-22 02:15:34,124 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 02:15:34,124 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:15:34,124 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:15:34,125 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:15:34,127 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2022-11-22 02:15:34,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:15:34,313 INFO L263 TraceCheckSpWp]: Trace formula consists of 620 conjuncts, 26 conjunts are in the unsatisfiable core [2022-11-22 02:15:34,315 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:15:34,735 INFO L134 CoverageAnalysis]: Checked inductivity of 606 backedges. 78 proven. 66 refuted. 0 times theorem prover too weak. 462 trivial. 0 not checked. [2022-11-22 02:15:34,736 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:15:35,093 INFO L134 CoverageAnalysis]: Checked inductivity of 606 backedges. 78 proven. 66 refuted. 0 times theorem prover too weak. 462 trivial. 0 not checked. [2022-11-22 02:15:35,093 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1800505286] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:15:35,093 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2088732542] [2022-11-22 02:15:35,094 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-22 02:15:35,094 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:15:35,095 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:15:35,095 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:15:35,095 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:15:35,113 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:15:35,135 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-22 02:15:35,136 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-11-22 02:15:35,146 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:15:35,170 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-22 02:15:35,171 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-22 02:15:35,192 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:15:35,195 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-22 02:15:35,232 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:15:35,233 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:15:35,255 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-22 02:15:35,256 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-11-22 02:15:35,318 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-22 02:15:35,468 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:15:37,684 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '28658#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:15:37,685 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:15:37,685 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:15:37,685 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 41 [2022-11-22 02:15:37,685 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [225420759] [2022-11-22 02:15:37,685 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:15:37,686 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2022-11-22 02:15:37,686 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:15:37,686 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2022-11-22 02:15:37,686 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=419, Invalid=1651, Unknown=0, NotChecked=0, Total=2070 [2022-11-22 02:15:37,686 INFO L87 Difference]: Start difference. First operand 114 states and 122 transitions. Second operand has 41 states, 41 states have (on average 1.4634146341463414) internal successors, (60), 41 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:15:39,016 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:15:39,016 INFO L93 Difference]: Finished difference Result 300 states and 323 transitions. [2022-11-22 02:15:39,016 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-11-22 02:15:39,016 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.4634146341463414) internal successors, (60), 41 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 113 [2022-11-22 02:15:39,017 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:15:39,017 INFO L225 Difference]: With dead ends: 300 [2022-11-22 02:15:39,018 INFO L226 Difference]: Without dead ends: 115 [2022-11-22 02:15:39,018 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 376 GetRequests, 235 SyntacticMatches, 85 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3750 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=679, Invalid=2627, Unknown=0, NotChecked=0, Total=3306 [2022-11-22 02:15:39,019 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 29 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 1377 mSolverCounterSat, 162 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 1539 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 162 IncrementalHoareTripleChecker+Valid, 1377 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-22 02:15:39,019 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [29 Valid, 29 Invalid, 1539 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [162 Valid, 1377 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-22 02:15:39,020 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2022-11-22 02:15:39,188 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 115. [2022-11-22 02:15:39,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 115 states, 114 states have (on average 1.0789473684210527) internal successors, (123), 114 states have internal predecessors, (123), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:15:39,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 123 transitions. [2022-11-22 02:15:39,189 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 123 transitions. Word has length 113 [2022-11-22 02:15:39,189 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:15:39,189 INFO L495 AbstractCegarLoop]: Abstraction has 115 states and 123 transitions. [2022-11-22 02:15:39,189 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 1.4634146341463414) internal successors, (60), 41 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:15:39,189 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 123 transitions. [2022-11-22 02:15:39,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2022-11-22 02:15:39,190 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:15:39,190 INFO L195 NwaCegarLoop]: trace histogram [12, 12, 11, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:15:39,194 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Ended with exit code 0 [2022-11-22 02:15:39,390 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:15:39,390 INFO L420 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:15:39,391 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:15:39,391 INFO L85 PathProgramCache]: Analyzing trace with hash -327423804, now seen corresponding path program 29 times [2022-11-22 02:15:39,391 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:15:39,391 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1061860852] [2022-11-22 02:15:39,391 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:15:39,391 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:15:39,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:15:39,883 INFO L134 CoverageAnalysis]: Checked inductivity of 618 backedges. 55 proven. 89 refuted. 0 times theorem prover too weak. 474 trivial. 0 not checked. [2022-11-22 02:15:39,883 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:15:39,883 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1061860852] [2022-11-22 02:15:39,883 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1061860852] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:15:39,884 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [512670136] [2022-11-22 02:15:39,884 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:15:39,884 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:15:39,884 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:15:39,885 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:15:39,887 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2022-11-22 02:15:40,166 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2022-11-22 02:15:40,167 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:15:40,171 INFO L263 TraceCheckSpWp]: Trace formula consists of 629 conjuncts, 26 conjunts are in the unsatisfiable core [2022-11-22 02:15:40,173 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:15:40,456 INFO L134 CoverageAnalysis]: Checked inductivity of 618 backedges. 66 proven. 78 refuted. 0 times theorem prover too weak. 474 trivial. 0 not checked. [2022-11-22 02:15:40,456 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:15:40,744 INFO L134 CoverageAnalysis]: Checked inductivity of 618 backedges. 66 proven. 78 refuted. 0 times theorem prover too weak. 474 trivial. 0 not checked. [2022-11-22 02:15:40,744 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [512670136] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:15:40,744 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1489865602] [2022-11-22 02:15:40,745 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-22 02:15:40,745 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:15:40,745 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:15:40,745 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:15:40,745 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:15:40,768 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:15:40,791 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-22 02:15:40,792 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-11-22 02:15:40,802 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:15:40,826 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-22 02:15:40,827 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-22 02:15:40,844 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:15:40,847 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-22 02:15:40,884 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:15:40,888 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:15:40,901 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-22 02:15:40,901 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 244 treesize of output 232 [2022-11-22 02:15:40,936 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-22 02:15:41,078 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:15:43,156 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '30223#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:15:43,156 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:15:43,156 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:15:43,156 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 41 [2022-11-22 02:15:43,156 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2097644948] [2022-11-22 02:15:43,157 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:15:43,157 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2022-11-22 02:15:43,157 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:15:43,157 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2022-11-22 02:15:43,158 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=413, Invalid=1657, Unknown=0, NotChecked=0, Total=2070 [2022-11-22 02:15:43,158 INFO L87 Difference]: Start difference. First operand 115 states and 123 transitions. Second operand has 41 states, 41 states have (on average 1.7804878048780488) internal successors, (73), 41 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:15:43,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:15:43,923 INFO L93 Difference]: Finished difference Result 210 states and 231 transitions. [2022-11-22 02:15:43,923 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-11-22 02:15:43,923 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.7804878048780488) internal successors, (73), 41 states have internal predecessors, (73), 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 114 [2022-11-22 02:15:43,924 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:15:43,924 INFO L225 Difference]: With dead ends: 210 [2022-11-22 02:15:43,924 INFO L226 Difference]: Without dead ends: 122 [2022-11-22 02:15:43,925 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 380 GetRequests, 226 SyntacticMatches, 97 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5155 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=843, Invalid=2579, Unknown=0, NotChecked=0, Total=3422 [2022-11-22 02:15:43,925 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 403 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 340 mSolverCounterSat, 259 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 403 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 599 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 259 IncrementalHoareTripleChecker+Valid, 340 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-22 02:15:43,925 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [403 Valid, 19 Invalid, 599 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [259 Valid, 340 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-22 02:15:43,926 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2022-11-22 02:15:44,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 122. [2022-11-22 02:15:44,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 121 states have (on average 1.0743801652892562) internal successors, (130), 121 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:15:44,108 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 130 transitions. [2022-11-22 02:15:44,108 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 130 transitions. Word has length 114 [2022-11-22 02:15:44,108 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:15:44,108 INFO L495 AbstractCegarLoop]: Abstraction has 122 states and 130 transitions. [2022-11-22 02:15:44,109 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 1.7804878048780488) internal successors, (73), 41 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:15:44,109 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 130 transitions. [2022-11-22 02:15:44,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2022-11-22 02:15:44,109 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:15:44,110 INFO L195 NwaCegarLoop]: trace histogram [12, 12, 12, 12, 12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:15:44,117 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2022-11-22 02:15:44,316 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:15:44,317 INFO L420 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:15:44,317 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:15:44,317 INFO L85 PathProgramCache]: Analyzing trace with hash -259351537, now seen corresponding path program 30 times [2022-11-22 02:15:44,317 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:15:44,317 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [527312426] [2022-11-22 02:15:44,317 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:15:44,317 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:15:44,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:16:21,747 INFO L134 CoverageAnalysis]: Checked inductivity of 702 backedges. 90 proven. 612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:16:21,747 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:16:21,747 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [527312426] [2022-11-22 02:16:21,747 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [527312426] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:16:21,747 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [216026893] [2022-11-22 02:16:21,747 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:16:21,747 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:16:21,748 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:16:21,748 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:16:21,752 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2022-11-22 02:16:21,975 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:16:21,976 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:16:21,983 WARN L261 TraceCheckSpWp]: Trace formula consists of 664 conjuncts, 422 conjunts are in the unsatisfiable core [2022-11-22 02:16:21,990 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:16:22,213 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-22 02:16:33,193 INFO L134 CoverageAnalysis]: Checked inductivity of 702 backedges. 0 proven. 702 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:16:33,194 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:16:40,856 INFO L134 CoverageAnalysis]: Checked inductivity of 702 backedges. 0 proven. 624 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2022-11-22 02:16:40,856 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [216026893] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:16:40,856 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1382096401] [2022-11-22 02:16:40,857 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-22 02:16:40,857 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:16:40,857 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:16:40,858 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:16:40,858 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:16:40,871 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:16:40,895 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-22 02:16:40,896 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-11-22 02:16:40,906 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:16:40,931 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-22 02:16:40,931 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-22 02:16:40,951 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:16:40,952 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-22 02:16:40,991 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:16:40,993 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:16:41,006 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-22 02:16:41,007 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 244 treesize of output 232 [2022-11-22 02:16:41,043 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-22 02:16:41,199 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:16:51,198 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '31757#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:16:51,198 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:16:51,198 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:16:51,199 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [103, 42, 29] total 132 [2022-11-22 02:16:51,199 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [266983896] [2022-11-22 02:16:51,199 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:16:51,199 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 132 states [2022-11-22 02:16:51,200 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:16:51,200 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 132 interpolants. [2022-11-22 02:16:51,201 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=850, Invalid=17782, Unknown=0, NotChecked=0, Total=18632 [2022-11-22 02:16:51,201 INFO L87 Difference]: Start difference. First operand 122 states and 130 transitions. Second operand has 132 states, 132 states have (on average 2.287878787878788) internal successors, (302), 132 states have internal predecessors, (302), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:17:18,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:17:18,058 INFO L93 Difference]: Finished difference Result 240 states and 268 transitions. [2022-11-22 02:17:18,058 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2022-11-22 02:17:18,059 INFO L78 Accepts]: Start accepts. Automaton has has 132 states, 132 states have (on average 2.287878787878788) internal successors, (302), 132 states have internal predecessors, (302), 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 121 [2022-11-22 02:17:18,059 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:17:18,060 INFO L225 Difference]: With dead ends: 240 [2022-11-22 02:17:18,060 INFO L226 Difference]: Without dead ends: 237 [2022-11-22 02:17:18,062 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 538 GetRequests, 193 SyntacticMatches, 153 SemanticMatches, 192 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22352 ImplicationChecksByTransitivity, 52.5s TimeCoverageRelationStatistics Valid=2434, Invalid=35008, Unknown=0, NotChecked=0, Total=37442 [2022-11-22 02:17:18,063 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 107 mSDsluCounter, 100 mSDsCounter, 0 mSdLazyCounter, 8820 mSolverCounterSat, 1772 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 107 SdHoareTripleChecker+Valid, 103 SdHoareTripleChecker+Invalid, 10592 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1772 IncrementalHoareTripleChecker+Valid, 8820 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 11.3s IncrementalHoareTripleChecker+Time [2022-11-22 02:17:18,063 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [107 Valid, 103 Invalid, 10592 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1772 Valid, 8820 Invalid, 0 Unknown, 0 Unchecked, 11.3s Time] [2022-11-22 02:17:18,064 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 237 states. [2022-11-22 02:17:18,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 237 to 123. [2022-11-22 02:17:18,281 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 123 states, 122 states have (on average 1.0737704918032787) internal successors, (131), 122 states have internal predecessors, (131), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:17:18,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 131 transitions. [2022-11-22 02:17:18,282 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 131 transitions. Word has length 121 [2022-11-22 02:17:18,282 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:17:18,282 INFO L495 AbstractCegarLoop]: Abstraction has 123 states and 131 transitions. [2022-11-22 02:17:18,283 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 132 states, 132 states have (on average 2.287878787878788) internal successors, (302), 132 states have internal predecessors, (302), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:17:18,283 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 131 transitions. [2022-11-22 02:17:18,283 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2022-11-22 02:17:18,283 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:17:18,284 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 12, 12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:17:18,289 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2022-11-22 02:17:18,484 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:17:18,484 INFO L420 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:17:18,485 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:17:18,485 INFO L85 PathProgramCache]: Analyzing trace with hash 549304737, now seen corresponding path program 31 times [2022-11-22 02:17:18,485 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:17:18,485 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [303841292] [2022-11-22 02:17:18,485 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:17:18,485 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:17:18,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:17:19,184 INFO L134 CoverageAnalysis]: Checked inductivity of 715 backedges. 79 proven. 90 refuted. 0 times theorem prover too weak. 546 trivial. 0 not checked. [2022-11-22 02:17:19,184 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:17:19,184 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [303841292] [2022-11-22 02:17:19,184 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [303841292] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:17:19,184 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2120442036] [2022-11-22 02:17:19,184 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 02:17:19,185 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:17:19,185 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:17:19,186 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:17:19,187 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2022-11-22 02:17:19,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:17:19,390 INFO L263 TraceCheckSpWp]: Trace formula consists of 669 conjuncts, 28 conjunts are in the unsatisfiable core [2022-11-22 02:17:19,392 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:17:19,868 INFO L134 CoverageAnalysis]: Checked inductivity of 715 backedges. 91 proven. 78 refuted. 0 times theorem prover too weak. 546 trivial. 0 not checked. [2022-11-22 02:17:19,868 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:17:20,324 INFO L134 CoverageAnalysis]: Checked inductivity of 715 backedges. 91 proven. 78 refuted. 0 times theorem prover too weak. 546 trivial. 0 not checked. [2022-11-22 02:17:20,325 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2120442036] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:17:20,325 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1320188053] [2022-11-22 02:17:20,326 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-22 02:17:20,326 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:17:20,326 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:17:20,326 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:17:20,326 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:17:20,341 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:17:20,363 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-22 02:17:20,364 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-11-22 02:17:20,373 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:17:20,398 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-22 02:17:20,398 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-22 02:17:20,419 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:17:20,420 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-22 02:17:20,465 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:17:20,466 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:17:20,488 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-22 02:17:20,488 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-11-22 02:17:20,565 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-22 02:17:20,704 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:17:22,232 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '33356#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:17:22,232 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:17:22,232 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:17:22,233 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 44 [2022-11-22 02:17:22,233 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1801603610] [2022-11-22 02:17:22,233 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:17:22,233 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2022-11-22 02:17:22,233 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:17:22,234 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2022-11-22 02:17:22,234 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=478, Invalid=1874, Unknown=0, NotChecked=0, Total=2352 [2022-11-22 02:17:22,235 INFO L87 Difference]: Start difference. First operand 123 states and 131 transitions. Second operand has 44 states, 44 states have (on average 1.4318181818181819) internal successors, (63), 44 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:17:23,586 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:17:23,586 INFO L93 Difference]: Finished difference Result 324 states and 347 transitions. [2022-11-22 02:17:23,586 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-11-22 02:17:23,586 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 1.4318181818181819) internal successors, (63), 44 states have internal predecessors, (63), 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 122 [2022-11-22 02:17:23,586 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:17:23,587 INFO L225 Difference]: With dead ends: 324 [2022-11-22 02:17:23,587 INFO L226 Difference]: Without dead ends: 124 [2022-11-22 02:17:23,588 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 406 GetRequests, 293 SyntacticMatches, 53 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2710 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=779, Invalid=3003, Unknown=0, NotChecked=0, Total=3782 [2022-11-22 02:17:23,588 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 35 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 982 mSolverCounterSat, 180 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 1162 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 180 IncrementalHoareTripleChecker+Valid, 982 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-22 02:17:23,588 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [35 Valid, 21 Invalid, 1162 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [180 Valid, 982 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-22 02:17:23,589 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2022-11-22 02:17:23,789 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 124. [2022-11-22 02:17:23,790 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 123 states have (on average 1.0731707317073171) internal successors, (132), 123 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:17:23,790 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 132 transitions. [2022-11-22 02:17:23,790 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 132 transitions. Word has length 122 [2022-11-22 02:17:23,790 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:17:23,790 INFO L495 AbstractCegarLoop]: Abstraction has 124 states and 132 transitions. [2022-11-22 02:17:23,790 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 1.4318181818181819) internal successors, (63), 44 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:17:23,790 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 132 transitions. [2022-11-22 02:17:23,791 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2022-11-22 02:17:23,791 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:17:23,791 INFO L195 NwaCegarLoop]: trace histogram [13, 13, 12, 12, 12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:17:23,796 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2022-11-22 02:17:23,991 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:17:23,992 INFO L420 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:17:23,992 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:17:23,992 INFO L85 PathProgramCache]: Analyzing trace with hash 1078955979, now seen corresponding path program 32 times [2022-11-22 02:17:23,992 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:17:23,992 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1848793207] [2022-11-22 02:17:23,992 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:17:23,992 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:17:24,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:17:24,581 INFO L134 CoverageAnalysis]: Checked inductivity of 728 backedges. 66 proven. 103 refuted. 0 times theorem prover too weak. 559 trivial. 0 not checked. [2022-11-22 02:17:24,581 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:17:24,581 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1848793207] [2022-11-22 02:17:24,581 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1848793207] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:17:24,581 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [354921144] [2022-11-22 02:17:24,581 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:17:24,582 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:17:24,582 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:17:24,582 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:17:24,585 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2022-11-22 02:17:25,024 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2022-11-22 02:17:25,024 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:17:25,029 INFO L263 TraceCheckSpWp]: Trace formula consists of 678 conjuncts, 28 conjunts are in the unsatisfiable core [2022-11-22 02:17:25,031 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:17:25,831 INFO L134 CoverageAnalysis]: Checked inductivity of 728 backedges. 91 proven. 78 refuted. 0 times theorem prover too weak. 559 trivial. 0 not checked. [2022-11-22 02:17:25,831 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:17:26,571 INFO L134 CoverageAnalysis]: Checked inductivity of 728 backedges. 91 proven. 78 refuted. 0 times theorem prover too weak. 559 trivial. 0 not checked. [2022-11-22 02:17:26,572 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [354921144] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:17:26,572 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [710010541] [2022-11-22 02:17:26,573 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-22 02:17:26,573 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:17:26,573 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:17:26,573 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:17:26,573 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:17:26,589 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:17:26,613 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-22 02:17:26,614 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-22 02:17:26,622 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:17:26,623 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-22 02:17:26,639 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:17:26,640 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-22 02:17:26,687 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:17:26,688 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:17:26,710 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-22 02:17:26,711 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-11-22 02:17:26,774 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-22 02:17:26,913 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:17:31,162 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '35071#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:17:31,163 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:17:31,163 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:17:31,163 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 69 [2022-11-22 02:17:31,163 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2126867687] [2022-11-22 02:17:31,163 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:17:31,164 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 69 states [2022-11-22 02:17:31,164 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:17:31,164 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2022-11-22 02:17:31,165 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=673, Invalid=4729, Unknown=0, NotChecked=0, Total=5402 [2022-11-22 02:17:31,165 INFO L87 Difference]: Start difference. First operand 124 states and 132 transitions. Second operand has 69 states, 69 states have (on average 1.4492753623188406) internal successors, (100), 69 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:17:32,417 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:17:32,418 INFO L93 Difference]: Finished difference Result 226 states and 247 transitions. [2022-11-22 02:17:32,418 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-11-22 02:17:32,418 INFO L78 Accepts]: Start accepts. Automaton has has 69 states, 69 states have (on average 1.4492753623188406) internal successors, (100), 69 states have internal predecessors, (100), 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 123 [2022-11-22 02:17:32,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:17:32,419 INFO L225 Difference]: With dead ends: 226 [2022-11-22 02:17:32,419 INFO L226 Difference]: Without dead ends: 131 [2022-11-22 02:17:32,420 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 425 GetRequests, 245 SyntacticMatches, 93 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7769 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=1185, Invalid=6647, Unknown=0, NotChecked=0, Total=7832 [2022-11-22 02:17:32,420 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 871 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 612 mSolverCounterSat, 388 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 871 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 1000 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 388 IncrementalHoareTripleChecker+Valid, 612 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-22 02:17:32,421 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [871 Valid, 23 Invalid, 1000 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [388 Valid, 612 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-22 02:17:32,421 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2022-11-22 02:17:32,624 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 131. [2022-11-22 02:17:32,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 131 states, 130 states have (on average 1.0692307692307692) internal successors, (139), 130 states have internal predecessors, (139), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:17:32,624 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 139 transitions. [2022-11-22 02:17:32,624 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 139 transitions. Word has length 123 [2022-11-22 02:17:32,624 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:17:32,624 INFO L495 AbstractCegarLoop]: Abstraction has 131 states and 139 transitions. [2022-11-22 02:17:32,625 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 69 states, 69 states have (on average 1.4492753623188406) internal successors, (100), 69 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:17:32,625 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 139 transitions. [2022-11-22 02:17:32,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2022-11-22 02:17:32,625 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:17:32,626 INFO L195 NwaCegarLoop]: trace histogram [13, 13, 13, 13, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:17:32,631 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2022-11-22 02:17:32,826 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2022-11-22 02:17:32,826 INFO L420 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:17:32,826 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:17:32,826 INFO L85 PathProgramCache]: Analyzing trace with hash 1637580674, now seen corresponding path program 33 times [2022-11-22 02:17:32,827 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:17:32,827 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1490922661] [2022-11-22 02:17:32,827 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:17:32,827 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:17:33,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:18:17,596 INFO L134 CoverageAnalysis]: Checked inductivity of 819 backedges. 120 proven. 699 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:18:17,596 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:18:17,596 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1490922661] [2022-11-22 02:18:17,597 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1490922661] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:18:17,597 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [899607098] [2022-11-22 02:18:17,597 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:18:17,597 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:18:17,597 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:18:17,598 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:18:17,604 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2022-11-22 02:18:17,847 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:18:17,847 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:18:17,855 WARN L261 TraceCheckSpWp]: Trace formula consists of 713 conjuncts, 454 conjunts are in the unsatisfiable core [2022-11-22 02:18:17,860 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:18:18,617 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2022-11-22 02:18:31,467 INFO L134 CoverageAnalysis]: Checked inductivity of 819 backedges. 0 proven. 819 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:18:31,467 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:18:40,553 INFO L134 CoverageAnalysis]: Checked inductivity of 819 backedges. 0 proven. 728 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2022-11-22 02:18:40,553 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [899607098] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:18:40,553 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [354013327] [2022-11-22 02:18:40,554 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-22 02:18:40,554 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:18:40,554 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:18:40,555 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:18:40,555 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:18:40,568 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:18:40,590 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-22 02:18:40,590 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-11-22 02:18:40,600 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:18:40,625 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-22 02:18:40,625 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-22 02:18:40,644 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:18:40,645 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-22 02:18:40,684 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:18:40,684 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:18:40,708 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-22 02:18:40,708 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-11-22 02:18:40,774 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-22 02:18:40,916 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:18:57,932 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '36741#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:18:57,932 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:18:57,932 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:18:57,932 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [111, 45, 31] total 146 [2022-11-22 02:18:57,933 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [14644128] [2022-11-22 02:18:57,933 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:18:57,933 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 146 states [2022-11-22 02:18:57,933 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:18:57,934 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 146 interpolants. [2022-11-22 02:18:57,935 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1010, Invalid=21640, Unknown=0, NotChecked=0, Total=22650 [2022-11-22 02:18:57,936 INFO L87 Difference]: Start difference. First operand 131 states and 139 transitions. Second operand has 146 states, 146 states have (on average 2.2465753424657535) internal successors, (328), 146 states have internal predecessors, (328), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:19:28,999 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:19:28,999 INFO L93 Difference]: Finished difference Result 256 states and 284 transitions. [2022-11-22 02:19:28,999 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2022-11-22 02:19:29,000 INFO L78 Accepts]: Start accepts. Automaton has has 146 states, 146 states have (on average 2.2465753424657535) internal successors, (328), 146 states have internal predecessors, (328), 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 130 [2022-11-22 02:19:29,000 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:19:29,001 INFO L225 Difference]: With dead ends: 256 [2022-11-22 02:19:29,001 INFO L226 Difference]: Without dead ends: 253 [2022-11-22 02:19:29,004 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 582 GetRequests, 175 SyntacticMatches, 193 SemanticMatches, 214 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32755 ImplicationChecksByTransitivity, 67.5s TimeCoverageRelationStatistics Valid=2971, Invalid=43469, Unknown=0, NotChecked=0, Total=46440 [2022-11-22 02:19:29,004 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 115 mSDsluCounter, 116 mSDsCounter, 0 mSdLazyCounter, 10006 mSolverCounterSat, 1396 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 11.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 115 SdHoareTripleChecker+Valid, 119 SdHoareTripleChecker+Invalid, 11402 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1396 IncrementalHoareTripleChecker+Valid, 10006 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 12.3s IncrementalHoareTripleChecker+Time [2022-11-22 02:19:29,004 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [115 Valid, 119 Invalid, 11402 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1396 Valid, 10006 Invalid, 0 Unknown, 0 Unchecked, 12.3s Time] [2022-11-22 02:19:29,005 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 253 states. [2022-11-22 02:19:29,375 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 253 to 132. [2022-11-22 02:19:29,375 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 132 states, 131 states have (on average 1.0687022900763359) internal successors, (140), 131 states have internal predecessors, (140), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:19:29,376 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 140 transitions. [2022-11-22 02:19:29,376 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 140 transitions. Word has length 130 [2022-11-22 02:19:29,376 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:19:29,376 INFO L495 AbstractCegarLoop]: Abstraction has 132 states and 140 transitions. [2022-11-22 02:19:29,376 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 146 states, 146 states have (on average 2.2465753424657535) internal successors, (328), 146 states have internal predecessors, (328), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:19:29,377 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 140 transitions. [2022-11-22 02:19:29,377 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2022-11-22 02:19:29,377 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:19:29,377 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 13, 13, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:19:29,389 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2022-11-22 02:19:29,584 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2022-11-22 02:19:29,584 INFO L420 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:19:29,584 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:19:29,585 INFO L85 PathProgramCache]: Analyzing trace with hash -775338866, now seen corresponding path program 34 times [2022-11-22 02:19:29,585 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:19:29,585 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [883031003] [2022-11-22 02:19:29,585 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:19:29,585 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:19:29,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:19:30,433 INFO L134 CoverageAnalysis]: Checked inductivity of 833 backedges. 92 proven. 104 refuted. 0 times theorem prover too weak. 637 trivial. 0 not checked. [2022-11-22 02:19:30,434 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:19:30,434 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [883031003] [2022-11-22 02:19:30,434 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [883031003] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:19:30,434 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1487473263] [2022-11-22 02:19:30,434 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 02:19:30,434 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:19:30,434 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:19:30,435 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:19:30,438 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2022-11-22 02:19:30,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:19:30,668 INFO L263 TraceCheckSpWp]: Trace formula consists of 718 conjuncts, 30 conjunts are in the unsatisfiable core [2022-11-22 02:19:30,670 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:19:31,202 INFO L134 CoverageAnalysis]: Checked inductivity of 833 backedges. 105 proven. 91 refuted. 0 times theorem prover too weak. 637 trivial. 0 not checked. [2022-11-22 02:19:31,202 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:19:31,650 INFO L134 CoverageAnalysis]: Checked inductivity of 833 backedges. 105 proven. 91 refuted. 0 times theorem prover too weak. 637 trivial. 0 not checked. [2022-11-22 02:19:31,650 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1487473263] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:19:31,650 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1984843641] [2022-11-22 02:19:31,651 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-22 02:19:31,651 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:19:31,652 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:19:31,652 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:19:31,652 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:19:31,667 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:19:31,690 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-22 02:19:31,690 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-11-22 02:19:31,700 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:19:31,724 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-22 02:19:31,725 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-22 02:19:31,744 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:19:31,745 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-22 02:19:31,782 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:19:31,784 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:19:31,798 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-22 02:19:31,798 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 244 treesize of output 232 [2022-11-22 02:19:31,835 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-22 02:19:31,989 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:19:34,318 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '38463#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:19:34,318 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:19:34,318 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:19:34,318 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 47 [2022-11-22 02:19:34,318 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1910233085] [2022-11-22 02:19:34,318 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:19:34,319 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2022-11-22 02:19:34,319 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:19:34,319 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2022-11-22 02:19:34,319 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=541, Invalid=2111, Unknown=0, NotChecked=0, Total=2652 [2022-11-22 02:19:34,319 INFO L87 Difference]: Start difference. First operand 132 states and 140 transitions. Second operand has 47 states, 47 states have (on average 1.4042553191489362) internal successors, (66), 47 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:19:35,822 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:19:35,822 INFO L93 Difference]: Finished difference Result 348 states and 371 transitions. [2022-11-22 02:19:35,822 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-11-22 02:19:35,822 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 1.4042553191489362) internal successors, (66), 47 states have internal predecessors, (66), 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 131 [2022-11-22 02:19:35,827 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:19:35,828 INFO L225 Difference]: With dead ends: 348 [2022-11-22 02:19:35,828 INFO L226 Difference]: Without dead ends: 133 [2022-11-22 02:19:35,829 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 436 GetRequests, 288 SyntacticMatches, 84 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4315 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=886, Invalid=3404, Unknown=0, NotChecked=0, Total=4290 [2022-11-22 02:19:35,829 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 31 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 920 mSolverCounterSat, 171 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 1091 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 171 IncrementalHoareTripleChecker+Valid, 920 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-22 02:19:35,830 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [31 Valid, 15 Invalid, 1091 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [171 Valid, 920 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-22 02:19:35,830 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2022-11-22 02:19:36,059 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 133. [2022-11-22 02:19:36,059 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 132 states have (on average 1.0681818181818181) internal successors, (141), 132 states have internal predecessors, (141), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:19:36,059 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 141 transitions. [2022-11-22 02:19:36,060 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 141 transitions. Word has length 131 [2022-11-22 02:19:36,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:19:36,060 INFO L495 AbstractCegarLoop]: Abstraction has 133 states and 141 transitions. [2022-11-22 02:19:36,060 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 1.4042553191489362) internal successors, (66), 47 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:19:36,060 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 141 transitions. [2022-11-22 02:19:36,060 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2022-11-22 02:19:36,061 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:19:36,061 INFO L195 NwaCegarLoop]: trace histogram [14, 14, 13, 13, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:19:36,066 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2022-11-22 02:19:36,261 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35,35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:19:36,261 INFO L420 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:19:36,261 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:19:36,261 INFO L85 PathProgramCache]: Analyzing trace with hash 502578596, now seen corresponding path program 35 times [2022-11-22 02:19:36,262 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:19:36,262 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [979333003] [2022-11-22 02:19:36,262 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:19:36,262 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:19:36,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:19:36,908 INFO L134 CoverageAnalysis]: Checked inductivity of 847 backedges. 78 proven. 118 refuted. 0 times theorem prover too weak. 651 trivial. 0 not checked. [2022-11-22 02:19:36,908 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:19:36,908 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [979333003] [2022-11-22 02:19:36,908 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [979333003] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:19:36,908 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [466139627] [2022-11-22 02:19:36,908 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:19:36,908 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:19:36,908 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:19:36,909 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:19:36,911 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2022-11-22 02:19:37,469 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2022-11-22 02:19:37,469 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:19:37,474 INFO L263 TraceCheckSpWp]: Trace formula consists of 727 conjuncts, 30 conjunts are in the unsatisfiable core [2022-11-22 02:19:37,476 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:19:37,853 INFO L134 CoverageAnalysis]: Checked inductivity of 847 backedges. 91 proven. 105 refuted. 0 times theorem prover too weak. 651 trivial. 0 not checked. [2022-11-22 02:19:37,853 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:19:38,251 INFO L134 CoverageAnalysis]: Checked inductivity of 847 backedges. 91 proven. 105 refuted. 0 times theorem prover too weak. 651 trivial. 0 not checked. [2022-11-22 02:19:38,252 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [466139627] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:19:38,252 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1549444688] [2022-11-22 02:19:38,253 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-22 02:19:38,253 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:19:38,254 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:19:38,254 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:19:38,254 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:19:38,268 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:19:38,293 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-22 02:19:38,293 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-22 02:19:38,302 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:19:38,303 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-22 02:19:38,320 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:19:38,321 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-22 02:19:38,365 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:19:38,367 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:19:38,379 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-22 02:19:38,379 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 244 treesize of output 232 [2022-11-22 02:19:38,417 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-22 02:19:38,578 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:19:40,337 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '40278#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:19:40,338 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:19:40,338 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:19:40,338 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 47 [2022-11-22 02:19:40,338 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [642514466] [2022-11-22 02:19:40,338 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:19:40,339 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2022-11-22 02:19:40,339 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:19:40,339 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2022-11-22 02:19:40,340 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=533, Invalid=2119, Unknown=0, NotChecked=0, Total=2652 [2022-11-22 02:19:40,340 INFO L87 Difference]: Start difference. First operand 133 states and 141 transitions. Second operand has 47 states, 47 states have (on average 1.8085106382978724) internal successors, (85), 47 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:19:41,370 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:19:41,370 INFO L93 Difference]: Finished difference Result 242 states and 263 transitions. [2022-11-22 02:19:41,370 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-11-22 02:19:41,370 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 1.8085106382978724) internal successors, (85), 47 states have internal predecessors, (85), 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 132 [2022-11-22 02:19:41,370 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:19:41,371 INFO L225 Difference]: With dead ends: 242 [2022-11-22 02:19:41,371 INFO L226 Difference]: Without dead ends: 140 [2022-11-22 02:19:41,372 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 440 GetRequests, 305 SyntacticMatches, 70 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4475 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=1104, Invalid=3318, Unknown=0, NotChecked=0, Total=4422 [2022-11-22 02:19:41,372 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 288 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 357 mSolverCounterSat, 401 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 288 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 758 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 401 IncrementalHoareTripleChecker+Valid, 357 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-22 02:19:41,373 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [288 Valid, 11 Invalid, 758 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [401 Valid, 357 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-22 02:19:41,373 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2022-11-22 02:19:41,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 140. [2022-11-22 02:19:41,637 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 140 states, 139 states have (on average 1.064748201438849) internal successors, (148), 139 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:19:41,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 148 transitions. [2022-11-22 02:19:41,638 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 148 transitions. Word has length 132 [2022-11-22 02:19:41,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:19:41,638 INFO L495 AbstractCegarLoop]: Abstraction has 140 states and 148 transitions. [2022-11-22 02:19:41,638 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 1.8085106382978724) internal successors, (85), 47 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:19:41,638 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 148 transitions. [2022-11-22 02:19:41,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2022-11-22 02:19:41,639 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:19:41,639 INFO L195 NwaCegarLoop]: trace histogram [14, 14, 14, 14, 14, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:19:41,647 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Ended with exit code 0 [2022-11-22 02:19:41,846 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2022-11-22 02:19:41,846 INFO L420 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:19:41,847 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:19:41,847 INFO L85 PathProgramCache]: Analyzing trace with hash 1382355183, now seen corresponding path program 36 times [2022-11-22 02:19:41,847 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:19:41,847 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1846447859] [2022-11-22 02:19:41,847 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:19:41,847 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:19:42,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:20:35,944 INFO L134 CoverageAnalysis]: Checked inductivity of 945 backedges. 168 proven. 777 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:20:35,944 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:20:35,944 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1846447859] [2022-11-22 02:20:35,944 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1846447859] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:20:35,944 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [79514356] [2022-11-22 02:20:35,944 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:20:35,944 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:20:35,944 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:20:35,945 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:20:35,948 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9457024f-f710-4521-90cd-1c72951a8c7d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2022-11-22 02:20:36,220 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:20:36,220 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:20:36,228 WARN L261 TraceCheckSpWp]: Trace formula consists of 762 conjuncts, 490 conjunts are in the unsatisfiable core [2022-11-22 02:20:36,233 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:20:37,677 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9