./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-crafted/zero_sum_const1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 4e7fbc69 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_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-crafted/zero_sum_const1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW --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 be1a0182ecf6c8aa754e6086345670fff3439e7c706169309311fcaa402caa1e --- 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-4e7fbc6 [2022-11-23 14:59:15,649 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-23 14:59:15,651 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-23 14:59:15,683 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-23 14:59:15,684 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-23 14:59:15,687 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-23 14:59:15,692 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-23 14:59:15,696 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-23 14:59:15,698 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-23 14:59:15,704 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-23 14:59:15,705 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-23 14:59:15,707 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-23 14:59:15,707 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-23 14:59:15,711 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-23 14:59:15,714 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-23 14:59:15,715 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-23 14:59:15,717 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-23 14:59:15,718 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-23 14:59:15,720 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-23 14:59:15,726 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-23 14:59:15,728 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-23 14:59:15,730 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-23 14:59:15,731 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-23 14:59:15,732 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-23 14:59:15,742 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-23 14:59:15,742 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-23 14:59:15,743 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-23 14:59:15,744 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-23 14:59:15,745 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-23 14:59:15,746 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-23 14:59:15,748 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-23 14:59:15,749 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-23 14:59:15,750 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-23 14:59:15,752 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-23 14:59:15,753 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-23 14:59:15,753 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-23 14:59:15,754 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-23 14:59:15,754 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-23 14:59:15,754 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-23 14:59:15,756 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-23 14:59:15,757 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-23 14:59:15,758 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-23 14:59:15,801 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-23 14:59:15,801 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-23 14:59:15,802 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-23 14:59:15,802 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-23 14:59:15,805 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-23 14:59:15,806 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-23 14:59:15,806 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-23 14:59:15,806 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-23 14:59:15,806 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-23 14:59:15,807 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-23 14:59:15,807 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-23 14:59:15,808 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-23 14:59:15,808 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-23 14:59:15,808 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-23 14:59:15,808 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-23 14:59:15,809 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-23 14:59:15,809 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-23 14:59:15,809 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-23 14:59:15,810 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-23 14:59:15,810 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-23 14:59:15,810 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-23 14:59:15,810 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-23 14:59:15,810 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-23 14:59:15,811 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-23 14:59:15,811 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-23 14:59:15,811 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-23 14:59:15,812 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-23 14:59:15,812 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-23 14:59:15,812 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-23 14:59:15,813 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-23 14:59:15,813 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-23 14:59:15,813 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-23 14:59:15,813 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-23 14:59:15,814 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-23 14:59:15,814 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-23 14:59:15,814 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-23 14:59:15,814 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-23 14:59:15,814 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-23 14:59:15,815 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-23 14:59:15,815 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-23 14:59:15,815 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-23 14:59:15,816 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_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> be1a0182ecf6c8aa754e6086345670fff3439e7c706169309311fcaa402caa1e [2022-11-23 14:59:16,140 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-23 14:59:16,178 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-23 14:59:16,181 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-23 14:59:16,197 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-23 14:59:16,198 INFO L275 PluginConnector]: CDTParser initialized [2022-11-23 14:59:16,199 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/../../sv-benchmarks/c/array-crafted/zero_sum_const1.c [2022-11-23 14:59:19,195 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-23 14:59:19,373 INFO L351 CDTParser]: Found 1 translation units. [2022-11-23 14:59:19,376 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/sv-benchmarks/c/array-crafted/zero_sum_const1.c [2022-11-23 14:59:19,384 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/data/3c08ea1a9/18b21029d2b44788bc69e8be14c8c0e6/FLAG0eeea8660 [2022-11-23 14:59:19,408 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/data/3c08ea1a9/18b21029d2b44788bc69e8be14c8c0e6 [2022-11-23 14:59:19,411 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-23 14:59:19,412 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-23 14:59:19,416 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-23 14:59:19,416 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-23 14:59:19,420 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-23 14:59:19,421 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:59:19" (1/1) ... [2022-11-23 14:59:19,424 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7af6e5b8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:59:19, skipping insertion in model container [2022-11-23 14:59:19,424 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:59:19" (1/1) ... [2022-11-23 14:59:19,432 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-23 14:59:19,450 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-23 14:59:19,650 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_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/sv-benchmarks/c/array-crafted/zero_sum_const1.c[406,419] [2022-11-23 14:59:19,679 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-23 14:59:19,692 INFO L203 MainTranslator]: Completed pre-run [2022-11-23 14:59:19,707 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_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/sv-benchmarks/c/array-crafted/zero_sum_const1.c[406,419] [2022-11-23 14:59:19,724 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-23 14:59:19,742 INFO L208 MainTranslator]: Completed translation [2022-11-23 14:59:19,743 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:59:19 WrapperNode [2022-11-23 14:59:19,743 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-23 14:59:19,745 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-23 14:59:19,745 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-23 14:59:19,745 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-23 14:59:19,753 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:59:19" (1/1) ... [2022-11-23 14:59:19,763 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:59:19" (1/1) ... [2022-11-23 14:59:19,786 INFO L138 Inliner]: procedures = 16, calls = 12, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 60 [2022-11-23 14:59:19,787 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-23 14:59:19,788 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-23 14:59:19,788 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-23 14:59:19,788 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-23 14:59:19,798 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:59:19" (1/1) ... [2022-11-23 14:59:19,798 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:59:19" (1/1) ... [2022-11-23 14:59:19,811 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:59:19" (1/1) ... [2022-11-23 14:59:19,812 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:59:19" (1/1) ... [2022-11-23 14:59:19,816 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:59:19" (1/1) ... [2022-11-23 14:59:19,825 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:59:19" (1/1) ... [2022-11-23 14:59:19,832 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:59:19" (1/1) ... [2022-11-23 14:59:19,833 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:59:19" (1/1) ... [2022-11-23 14:59:19,835 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-23 14:59:19,836 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-23 14:59:19,837 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-23 14:59:19,838 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-23 14:59:19,839 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:59:19" (1/1) ... [2022-11-23 14:59:19,845 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-23 14:59:19,858 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:59:19,874 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-23 14:59:19,906 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-23 14:59:19,928 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-23 14:59:19,928 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-23 14:59:19,928 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-11-23 14:59:19,928 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2022-11-23 14:59:19,929 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-23 14:59:19,929 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-23 14:59:19,929 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-11-23 14:59:20,015 INFO L235 CfgBuilder]: Building ICFG [2022-11-23 14:59:20,017 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-23 14:59:20,195 INFO L276 CfgBuilder]: Performing block encoding [2022-11-23 14:59:20,229 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-23 14:59:20,234 INFO L300 CfgBuilder]: Removed 3 assume(true) statements. [2022-11-23 14:59:20,237 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:59:20 BoogieIcfgContainer [2022-11-23 14:59:20,238 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-23 14:59:20,241 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-23 14:59:20,242 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-23 14:59:20,245 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-23 14:59:20,245 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 02:59:19" (1/3) ... [2022-11-23 14:59:20,246 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@38a01340 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:59:20, skipping insertion in model container [2022-11-23 14:59:20,247 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:59:19" (2/3) ... [2022-11-23 14:59:20,249 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@38a01340 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:59:20, skipping insertion in model container [2022-11-23 14:59:20,250 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:59:20" (3/3) ... [2022-11-23 14:59:20,254 INFO L112 eAbstractionObserver]: Analyzing ICFG zero_sum_const1.c [2022-11-23 14:59:20,279 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-23 14:59:20,279 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-23 14:59:20,338 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-23 14:59:20,344 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;@1ba5b9bf, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-23 14:59:20,344 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-23 14:59:20,348 INFO L276 IsEmpty]: Start isEmpty. Operand has 11 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 10 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:59:20,353 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-11-23 14:59:20,353 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:59:20,354 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:59:20,355 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:59:20,360 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:59:20,361 INFO L85 PathProgramCache]: Analyzing trace with hash -1231969017, now seen corresponding path program 1 times [2022-11-23 14:59:20,371 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:59:20,372 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [224913632] [2022-11-23 14:59:20,372 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:59:20,372 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:59:20,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:59:20,696 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:59:20,697 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:59:20,697 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [224913632] [2022-11-23 14:59:20,698 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [224913632] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:59:20,698 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 14:59:20,698 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-23 14:59:20,700 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [465979561] [2022-11-23 14:59:20,701 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:59:20,705 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-23 14:59:20,705 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:59:20,774 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-23 14:59:20,775 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-23 14:59:20,777 INFO L87 Difference]: Start difference. First operand has 11 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 10 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:59:20,860 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:59:20,860 INFO L93 Difference]: Finished difference Result 20 states and 27 transitions. [2022-11-23 14:59:20,862 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-23 14:59:20,863 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2022-11-23 14:59:20,863 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:59:20,871 INFO L225 Difference]: With dead ends: 20 [2022-11-23 14:59:20,871 INFO L226 Difference]: Without dead ends: 9 [2022-11-23 14:59:20,874 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 [2022-11-23 14:59:20,884 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 0 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 17 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 14:59:20,886 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 10 Invalid, 17 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 14:59:20,905 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2022-11-23 14:59:20,921 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2022-11-23 14:59:20,923 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9 states, 8 states have (on average 1.375) internal successors, (11), 8 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:59:20,924 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 11 transitions. [2022-11-23 14:59:20,925 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 11 transitions. Word has length 7 [2022-11-23 14:59:20,925 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:59:20,926 INFO L495 AbstractCegarLoop]: Abstraction has 9 states and 11 transitions. [2022-11-23 14:59:20,926 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:59:20,927 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 11 transitions. [2022-11-23 14:59:20,927 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-11-23 14:59:20,927 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:59:20,928 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:59:20,928 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-23 14:59:20,929 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:59:20,930 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:59:20,931 INFO L85 PathProgramCache]: Analyzing trace with hash 288279783, now seen corresponding path program 1 times [2022-11-23 14:59:20,931 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:59:20,932 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1096420532] [2022-11-23 14:59:20,932 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:59:20,932 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:59:20,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:59:21,084 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 14:59:21,084 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:59:21,085 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1096420532] [2022-11-23 14:59:21,085 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1096420532] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:59:21,085 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 14:59:21,085 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-23 14:59:21,085 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1137418258] [2022-11-23 14:59:21,086 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:59:21,087 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-23 14:59:21,087 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:59:21,088 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-23 14:59:21,088 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-23 14:59:21,088 INFO L87 Difference]: Start difference. First operand 9 states and 11 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 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) [2022-11-23 14:59:21,121 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:59:21,124 INFO L93 Difference]: Finished difference Result 15 states and 19 transitions. [2022-11-23 14:59:21,125 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-23 14:59:21,125 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2022-11-23 14:59:21,125 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:59:21,126 INFO L225 Difference]: With dead ends: 15 [2022-11-23 14:59:21,126 INFO L226 Difference]: Without dead ends: 11 [2022-11-23 14:59:21,126 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 [2022-11-23 14:59:21,128 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 9 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 5 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-23 14:59:21,131 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 5 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-23 14:59:21,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2022-11-23 14:59:21,136 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2022-11-23 14:59:21,138 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11 states, 10 states have (on average 1.3) internal successors, (13), 10 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) [2022-11-23 14:59:21,138 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 13 transitions. [2022-11-23 14:59:21,139 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 13 transitions. Word has length 8 [2022-11-23 14:59:21,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:59:21,140 INFO L495 AbstractCegarLoop]: Abstraction has 11 states and 13 transitions. [2022-11-23 14:59:21,141 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 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) [2022-11-23 14:59:21,142 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 13 transitions. [2022-11-23 14:59:21,142 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-11-23 14:59:21,143 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:59:21,143 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:59:21,143 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-23 14:59:21,144 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:59:21,144 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:59:21,146 INFO L85 PathProgramCache]: Analyzing trace with hash 1903708184, now seen corresponding path program 1 times [2022-11-23 14:59:21,146 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:59:21,146 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [664677319] [2022-11-23 14:59:21,147 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:59:21,148 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:59:21,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:59:21,261 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-23 14:59:21,261 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:59:21,261 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [664677319] [2022-11-23 14:59:21,262 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [664677319] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:59:21,262 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [871563852] [2022-11-23 14:59:21,262 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:59:21,262 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:59:21,263 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:59:21,266 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:59:21,297 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-23 14:59:21,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:59:21,384 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-23 14:59:21,389 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:59:21,446 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-23 14:59:21,446 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:59:21,480 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-23 14:59:21,481 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [871563852] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:59:21,482 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1740994742] [2022-11-23 14:59:21,508 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-23 14:59:21,508 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:59:21,512 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:59:21,518 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:59:21,518 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:59:21,692 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-23 14:59:21,694 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-23 14:59:21,730 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 [2022-11-23 14:59:21,819 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 [2022-11-23 14:59:21,984 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:59:21,986 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:59:22,015 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-23 14:59:22,015 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 245 treesize of output 248 [2022-11-23 14:59:22,262 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 [2022-11-23 14:59:22,394 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:59:22,695 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '162#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-23 14:59:22,695 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:59:22,695 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:59:22,696 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2022-11-23 14:59:22,696 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1303416313] [2022-11-23 14:59:22,696 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:59:22,697 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-23 14:59:22,697 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:59:22,697 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-23 14:59:22,698 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2022-11-23 14:59:22,698 INFO L87 Difference]: Start difference. First operand 11 states and 13 transitions. Second operand has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 7 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:59:22,730 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:59:22,731 INFO L93 Difference]: Finished difference Result 19 states and 23 transitions. [2022-11-23 14:59:22,731 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-23 14:59:22,732 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 7 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2022-11-23 14:59:22,732 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:59:22,732 INFO L225 Difference]: With dead ends: 19 [2022-11-23 14:59:22,732 INFO L226 Difference]: Without dead ends: 12 [2022-11-23 14:59:22,733 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 19 SyntacticMatches, 3 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2022-11-23 14:59:22,740 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 30 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-23 14:59:22,746 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 9 Invalid, 30 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-23 14:59:22,747 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2022-11-23 14:59:22,749 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2022-11-23 14:59:22,749 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 11 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) [2022-11-23 14:59:22,749 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 14 transitions. [2022-11-23 14:59:22,750 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 14 transitions. Word has length 10 [2022-11-23 14:59:22,750 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:59:22,750 INFO L495 AbstractCegarLoop]: Abstraction has 12 states and 14 transitions. [2022-11-23 14:59:22,750 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 7 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:59:22,750 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 14 transitions. [2022-11-23 14:59:22,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-11-23 14:59:22,751 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:59:22,751 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:59:22,765 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-23 14:59:22,959 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:59:22,960 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:59:22,961 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:59:22,961 INFO L85 PathProgramCache]: Analyzing trace with hash 1205572664, now seen corresponding path program 2 times [2022-11-23 14:59:22,961 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:59:22,962 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [98839412] [2022-11-23 14:59:22,962 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:59:22,962 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:59:22,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:59:23,088 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-23 14:59:23,088 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:59:23,088 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [98839412] [2022-11-23 14:59:23,089 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [98839412] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:59:23,089 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2068721781] [2022-11-23 14:59:23,089 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 14:59:23,089 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:59:23,089 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:59:23,090 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:59:23,111 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-23 14:59:23,153 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-23 14:59:23,154 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 14:59:23,155 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-23 14:59:23,157 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:59:23,223 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-23 14:59:23,223 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:59:23,252 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-23 14:59:23,252 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2068721781] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:59:23,252 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1697175945] [2022-11-23 14:59:23,255 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-23 14:59:23,255 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:59:23,255 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:59:23,255 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:59:23,256 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:59:23,327 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-23 14:59:23,327 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-23 14:59:23,342 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 [2022-11-23 14:59:23,385 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 [2022-11-23 14:59:23,464 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:59:23,465 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:59:23,493 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-23 14:59:23,494 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 245 treesize of output 248 [2022-11-23 14:59:23,582 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 [2022-11-23 14:59:23,679 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:59:23,942 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '284#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-23 14:59:23,943 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:59:23,943 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:59:23,943 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2022-11-23 14:59:23,943 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [497076294] [2022-11-23 14:59:23,943 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:59:23,944 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-23 14:59:23,944 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:59:23,944 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-23 14:59:23,945 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=117, Unknown=0, NotChecked=0, Total=156 [2022-11-23 14:59:23,945 INFO L87 Difference]: Start difference. First operand 12 states and 14 transitions. Second operand has 8 states, 8 states have (on average 1.875) internal successors, (15), 8 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:59:23,978 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:59:23,978 INFO L93 Difference]: Finished difference Result 19 states and 23 transitions. [2022-11-23 14:59:23,979 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-23 14:59:23,979 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.875) internal successors, (15), 8 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2022-11-23 14:59:23,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:59:23,980 INFO L225 Difference]: With dead ends: 19 [2022-11-23 14:59:23,980 INFO L226 Difference]: Without dead ends: 14 [2022-11-23 14:59:23,980 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 20 SyntacticMatches, 5 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=39, Invalid=117, Unknown=0, NotChecked=0, Total=156 [2022-11-23 14:59:23,981 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 8 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 5 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-23 14:59:23,982 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 5 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-23 14:59:23,982 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2022-11-23 14:59:23,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2022-11-23 14:59:23,985 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 13 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:59:23,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2022-11-23 14:59:23,985 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 11 [2022-11-23 14:59:23,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:59:23,986 INFO L495 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2022-11-23 14:59:23,986 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.875) internal successors, (15), 8 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:59:23,986 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2022-11-23 14:59:23,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-23 14:59:23,986 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:59:23,987 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:59:23,996 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-23 14:59:24,191 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:59:24,192 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:59:24,192 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:59:24,192 INFO L85 PathProgramCache]: Analyzing trace with hash -259387289, now seen corresponding path program 3 times [2022-11-23 14:59:24,192 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:59:24,192 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [27875646] [2022-11-23 14:59:24,192 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:59:24,193 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:59:24,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:59:24,960 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:59:24,962 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:59:24,962 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [27875646] [2022-11-23 14:59:24,962 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [27875646] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:59:24,962 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1530537464] [2022-11-23 14:59:24,963 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 14:59:24,963 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:59:24,963 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:59:24,964 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:59:24,972 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-23 14:59:25,032 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 14:59:25,033 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 14:59:25,034 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 32 conjunts are in the unsatisfiable core [2022-11-23 14:59:25,036 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:59:25,290 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 14:59:25,292 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:59:25,543 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 14:59:25,544 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 35 treesize of output 51 [2022-11-23 14:59:25,629 INFO L321 Elim1Store]: treesize reduction 34, result has 20.9 percent of original size [2022-11-23 14:59:25,630 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 36 treesize of output 18 [2022-11-23 14:59:25,744 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 14:59:25,745 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1530537464] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:59:25,745 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [839731481] [2022-11-23 14:59:25,749 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-23 14:59:25,749 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:59:25,750 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:59:25,750 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:59:25,750 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:59:25,822 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-23 14:59:25,823 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 26 treesize of output 46 [2022-11-23 14:59:25,887 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-23 14:59:25,888 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-23 14:59:25,924 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 [2022-11-23 14:59:26,000 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:59:26,004 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:59:26,016 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-23 14:59:26,017 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 250 treesize of output 247 [2022-11-23 14:59:26,083 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 [2022-11-23 14:59:26,153 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:59:26,505 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '439#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-23 14:59:26,505 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:59:26,505 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:59:26,505 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11, 10] total 25 [2022-11-23 14:59:26,505 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [420194327] [2022-11-23 14:59:26,506 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:59:26,506 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-11-23 14:59:26,506 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:59:26,506 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-11-23 14:59:26,507 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=763, Unknown=0, NotChecked=0, Total=870 [2022-11-23 14:59:26,507 INFO L87 Difference]: Start difference. First operand 14 states and 16 transitions. Second operand has 25 states, 25 states have (on average 1.32) internal successors, (33), 25 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) [2022-11-23 14:59:27,157 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:59:27,157 INFO L93 Difference]: Finished difference Result 21 states and 24 transitions. [2022-11-23 14:59:27,161 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-23 14:59:27,161 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.32) internal successors, (33), 25 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 13 [2022-11-23 14:59:27,162 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:59:27,162 INFO L225 Difference]: With dead ends: 21 [2022-11-23 14:59:27,162 INFO L226 Difference]: Without dead ends: 18 [2022-11-23 14:59:27,163 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 19 SyntacticMatches, 2 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 285 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=180, Invalid=1302, Unknown=0, NotChecked=0, Total=1482 [2022-11-23 14:59:27,164 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 10 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 200 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 218 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 200 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-23 14:59:27,164 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 27 Invalid, 218 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 200 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-23 14:59:27,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2022-11-23 14:59:27,168 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 16. [2022-11-23 14:59:27,175 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 15 states have internal predecessors, (19), 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) [2022-11-23 14:59:27,175 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 19 transitions. [2022-11-23 14:59:27,176 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 19 transitions. Word has length 13 [2022-11-23 14:59:27,176 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:59:27,176 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 19 transitions. [2022-11-23 14:59:27,176 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.32) internal successors, (33), 25 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) [2022-11-23 14:59:27,176 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 19 transitions. [2022-11-23 14:59:27,177 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-11-23 14:59:27,177 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:59:27,177 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:59:27,191 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-23 14:59:27,378 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:59:27,378 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:59:27,379 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:59:27,379 INFO L85 PathProgramCache]: Analyzing trace with hash 1380207612, now seen corresponding path program 4 times [2022-11-23 14:59:27,379 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:59:27,379 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [952760895] [2022-11-23 14:59:27,379 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:59:27,379 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:59:27,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:59:27,483 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-23 14:59:27,486 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:59:27,486 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [952760895] [2022-11-23 14:59:27,486 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [952760895] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:59:27,486 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1903844670] [2022-11-23 14:59:27,486 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-23 14:59:27,487 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:59:27,487 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:59:27,488 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:59:27,520 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-23 14:59:27,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:59:27,564 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-23 14:59:27,565 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:59:27,633 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-23 14:59:27,633 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:59:27,687 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-23 14:59:27,687 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1903844670] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:59:27,687 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [769514365] [2022-11-23 14:59:27,689 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-23 14:59:27,689 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:59:27,689 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:59:27,690 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:59:27,690 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:59:27,768 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-23 14:59:27,768 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 26 treesize of output 46 [2022-11-23 14:59:27,829 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-23 14:59:27,830 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-23 14:59:27,855 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 [2022-11-23 14:59:27,915 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:59:27,916 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:59:27,939 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-23 14:59:27,940 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 245 treesize of output 248 [2022-11-23 14:59:28,065 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 [2022-11-23 14:59:28,123 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:59:28,391 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '614#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-23 14:59:28,391 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:59:28,391 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:59:28,392 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 13 [2022-11-23 14:59:28,392 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [241585600] [2022-11-23 14:59:28,392 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:59:28,392 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-11-23 14:59:28,392 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:59:28,393 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-11-23 14:59:28,393 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=239, Unknown=0, NotChecked=0, Total=306 [2022-11-23 14:59:28,393 INFO L87 Difference]: Start difference. First operand 16 states and 19 transitions. Second operand has 13 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 13 states have internal predecessors, (21), 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) [2022-11-23 14:59:28,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:59:28,496 INFO L93 Difference]: Finished difference Result 33 states and 39 transitions. [2022-11-23 14:59:28,496 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-11-23 14:59:28,497 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 13 states have internal predecessors, (21), 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 [2022-11-23 14:59:28,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:59:28,497 INFO L225 Difference]: With dead ends: 33 [2022-11-23 14:59:28,497 INFO L226 Difference]: Without dead ends: 20 [2022-11-23 14:59:28,498 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 27 SyntacticMatches, 5 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 145 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=91, Invalid=329, Unknown=0, NotChecked=0, Total=420 [2022-11-23 14:59:28,499 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 11 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 46 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 83 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 46 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 14:59:28,499 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 13 Invalid, 83 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 46 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 14:59:28,500 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2022-11-23 14:59:28,504 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 16. [2022-11-23 14:59:28,504 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.2) internal successors, (18), 15 states have internal predecessors, (18), 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) [2022-11-23 14:59:28,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2022-11-23 14:59:28,505 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 14 [2022-11-23 14:59:28,505 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:59:28,505 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2022-11-23 14:59:28,506 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 13 states have internal predecessors, (21), 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) [2022-11-23 14:59:28,506 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2022-11-23 14:59:28,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-11-23 14:59:28,506 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:59:28,506 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:59:28,520 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-23 14:59:28,712 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:59:28,713 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:59:28,713 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:59:28,713 INFO L85 PathProgramCache]: Analyzing trace with hash 1877248028, now seen corresponding path program 5 times [2022-11-23 14:59:28,713 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:59:28,713 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1507376980] [2022-11-23 14:59:28,713 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:59:28,713 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:59:28,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:59:28,848 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-23 14:59:28,849 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:59:28,849 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1507376980] [2022-11-23 14:59:28,849 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1507376980] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:59:28,849 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [562318036] [2022-11-23 14:59:28,850 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 14:59:28,850 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:59:28,850 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:59:28,851 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:59:28,886 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-23 14:59:28,925 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-23 14:59:28,925 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 14:59:28,926 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-23 14:59:28,927 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:59:29,000 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-23 14:59:29,000 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:59:29,060 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-23 14:59:29,060 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [562318036] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:59:29,061 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [259944335] [2022-11-23 14:59:29,062 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-23 14:59:29,063 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:59:29,063 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:59:29,063 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:59:29,063 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:59:29,120 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-23 14:59:29,121 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 26 treesize of output 46 [2022-11-23 14:59:29,181 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-23 14:59:29,182 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-23 14:59:29,234 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 [2022-11-23 14:59:29,307 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:59:29,308 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:59:29,331 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-23 14:59:29,332 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 245 treesize of output 248 [2022-11-23 14:59:29,437 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 [2022-11-23 14:59:29,504 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:59:29,714 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '805#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-23 14:59:29,714 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:59:29,714 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:59:29,715 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2022-11-23 14:59:29,715 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2087925661] [2022-11-23 14:59:29,715 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:59:29,715 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-23 14:59:29,715 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:59:29,716 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-23 14:59:29,716 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=269, Unknown=0, NotChecked=0, Total=342 [2022-11-23 14:59:29,716 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand has 14 states, 14 states have (on average 1.5) internal successors, (21), 14 states have internal predecessors, (21), 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) [2022-11-23 14:59:29,843 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:59:29,844 INFO L93 Difference]: Finished difference Result 20 states and 22 transitions. [2022-11-23 14:59:29,844 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-23 14:59:29,844 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.5) internal successors, (21), 14 states have internal predecessors, (21), 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 15 [2022-11-23 14:59:29,844 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:59:29,845 INFO L225 Difference]: With dead ends: 20 [2022-11-23 14:59:29,845 INFO L226 Difference]: Without dead ends: 17 [2022-11-23 14:59:29,845 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 29 SyntacticMatches, 6 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 179 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=111, Invalid=441, Unknown=0, NotChecked=0, Total=552 [2022-11-23 14:59:29,846 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 14 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 7 SdHoareTripleChecker+Invalid, 93 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 14:59:29,846 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 7 Invalid, 93 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 56 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 14:59:29,847 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2022-11-23 14:59:29,851 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2022-11-23 14:59:29,851 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 16 states have (on average 1.1875) internal successors, (19), 16 states have internal predecessors, (19), 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) [2022-11-23 14:59:29,852 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2022-11-23 14:59:29,852 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 15 [2022-11-23 14:59:29,852 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:59:29,852 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2022-11-23 14:59:29,852 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 1.5) internal successors, (21), 14 states have internal predecessors, (21), 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) [2022-11-23 14:59:29,853 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2022-11-23 14:59:29,853 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-11-23 14:59:29,853 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:59:29,853 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:59:29,864 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-23 14:59:30,059 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2022-11-23 14:59:30,060 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:59:30,060 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:59:30,060 INFO L85 PathProgramCache]: Analyzing trace with hash -1935008968, now seen corresponding path program 6 times [2022-11-23 14:59:30,060 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:59:30,060 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [249045672] [2022-11-23 14:59:30,060 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:59:30,061 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:59:30,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:59:31,043 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:59:31,044 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:59:31,044 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [249045672] [2022-11-23 14:59:31,044 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [249045672] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:59:31,044 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1114434724] [2022-11-23 14:59:31,044 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 14:59:31,044 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:59:31,044 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:59:31,049 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:59:31,059 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-23 14:59:31,122 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 14:59:31,122 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 14:59:31,124 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 40 conjunts are in the unsatisfiable core [2022-11-23 14:59:31,125 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:59:31,476 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 3 proven. 12 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-23 14:59:31,476 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:59:31,939 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 14:59:31,939 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 53 treesize of output 108 [2022-11-23 14:59:32,200 INFO L321 Elim1Store]: treesize reduction 84, result has 13.4 percent of original size [2022-11-23 14:59:32,200 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 52 treesize of output 23 [2022-11-23 14:59:32,328 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-23 14:59:32,329 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1114434724] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:59:32,329 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [73393832] [2022-11-23 14:59:32,331 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-23 14:59:32,331 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:59:32,331 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:59:32,331 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:59:32,332 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:59:32,391 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-23 14:59:32,392 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-23 14:59:32,413 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 [2022-11-23 14:59:32,435 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 [2022-11-23 14:59:32,493 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:59:32,496 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:59:32,508 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-23 14:59:32,508 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 250 treesize of output 247 [2022-11-23 14:59:32,562 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 [2022-11-23 14:59:32,629 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:59:32,986 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1003#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-23 14:59:32,987 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:59:32,988 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:59:32,988 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13, 12] total 32 [2022-11-23 14:59:32,988 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1925084527] [2022-11-23 14:59:32,988 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:59:32,989 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-11-23 14:59:32,989 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:59:32,989 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-11-23 14:59:32,990 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=1189, Unknown=0, NotChecked=0, Total=1332 [2022-11-23 14:59:32,990 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand has 32 states, 32 states have (on average 1.25) internal successors, (40), 32 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) [2022-11-23 14:59:34,102 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:59:34,102 INFO L93 Difference]: Finished difference Result 25 states and 28 transitions. [2022-11-23 14:59:34,104 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-11-23 14:59:34,104 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.25) internal successors, (40), 32 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 16 [2022-11-23 14:59:34,104 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:59:34,104 INFO L225 Difference]: With dead ends: 25 [2022-11-23 14:59:34,105 INFO L226 Difference]: Without dead ends: 22 [2022-11-23 14:59:34,106 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 24 SyntacticMatches, 2 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 452 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=252, Invalid=2100, Unknown=0, NotChecked=0, Total=2352 [2022-11-23 14:59:34,106 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 11 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 302 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 334 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 302 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-23 14:59:34,107 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 33 Invalid, 334 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 302 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-23 14:59:34,107 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2022-11-23 14:59:34,113 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 19. [2022-11-23 14:59:34,113 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 18 states have (on average 1.2222222222222223) internal successors, (22), 18 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:59:34,114 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 22 transitions. [2022-11-23 14:59:34,114 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 22 transitions. Word has length 16 [2022-11-23 14:59:34,114 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:59:34,114 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 22 transitions. [2022-11-23 14:59:34,114 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 1.25) internal successors, (40), 32 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) [2022-11-23 14:59:34,114 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 22 transitions. [2022-11-23 14:59:34,115 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-11-23 14:59:34,115 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:59:34,115 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:59:34,124 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2022-11-23 14:59:34,319 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:59:34,319 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:59:34,320 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:59:34,320 INFO L85 PathProgramCache]: Analyzing trace with hash 148779469, now seen corresponding path program 7 times [2022-11-23 14:59:34,320 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:59:34,320 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1966265477] [2022-11-23 14:59:34,320 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:59:34,320 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:59:34,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:59:34,452 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 7 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-23 14:59:34,453 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:59:34,453 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1966265477] [2022-11-23 14:59:34,453 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1966265477] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:59:34,453 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [390687905] [2022-11-23 14:59:34,453 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-23 14:59:34,453 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:59:34,454 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:59:34,454 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:59:34,479 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-23 14:59:34,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:59:34,518 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-23 14:59:34,519 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:59:34,602 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-23 14:59:34,602 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:59:34,665 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-23 14:59:34,665 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [390687905] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:59:34,665 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1394917787] [2022-11-23 14:59:34,667 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-23 14:59:34,667 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:59:34,667 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:59:34,667 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:59:34,668 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:59:34,748 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-23 14:59:34,749 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 26 treesize of output 46 [2022-11-23 14:59:34,818 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-23 14:59:34,818 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-23 14:59:34,856 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 [2022-11-23 14:59:34,929 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:59:34,930 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:59:34,954 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-23 14:59:34,955 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 245 treesize of output 248 [2022-11-23 14:59:35,034 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 [2022-11-23 14:59:35,088 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:59:35,292 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1219#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-23 14:59:35,292 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:59:35,293 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:59:35,293 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 16 [2022-11-23 14:59:35,293 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1039623231] [2022-11-23 14:59:35,293 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:59:35,293 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-11-23 14:59:35,293 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:59:35,294 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-11-23 14:59:35,294 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=330, Unknown=0, NotChecked=0, Total=420 [2022-11-23 14:59:35,294 INFO L87 Difference]: Start difference. First operand 19 states and 22 transitions. Second operand has 16 states, 16 states have (on average 1.5) internal successors, (24), 16 states have internal predecessors, (24), 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) [2022-11-23 14:59:35,431 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:59:35,431 INFO L93 Difference]: Finished difference Result 39 states and 45 transitions. [2022-11-23 14:59:35,432 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-23 14:59:35,432 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.5) internal successors, (24), 16 states have internal predecessors, (24), 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 17 [2022-11-23 14:59:35,432 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:59:35,433 INFO L225 Difference]: With dead ends: 39 [2022-11-23 14:59:35,433 INFO L226 Difference]: Without dead ends: 23 [2022-11-23 14:59:35,433 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 33 SyntacticMatches, 7 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 221 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=128, Invalid=472, Unknown=0, NotChecked=0, Total=600 [2022-11-23 14:59:35,434 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 11 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 75 mSolverCounterSat, 45 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 120 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 45 IncrementalHoareTripleChecker+Valid, 75 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 14:59:35,434 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 13 Invalid, 120 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [45 Valid, 75 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 14:59:35,435 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2022-11-23 14:59:35,440 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 19. [2022-11-23 14:59:35,441 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 18 states have (on average 1.1666666666666667) internal successors, (21), 18 states have internal predecessors, (21), 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) [2022-11-23 14:59:35,441 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2022-11-23 14:59:35,441 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 17 [2022-11-23 14:59:35,441 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:59:35,441 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2022-11-23 14:59:35,442 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 1.5) internal successors, (24), 16 states have internal predecessors, (24), 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) [2022-11-23 14:59:35,442 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2022-11-23 14:59:35,442 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-11-23 14:59:35,442 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:59:35,442 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:59:35,459 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-23 14:59:35,648 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:59:35,648 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:59:35,648 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:59:35,649 INFO L85 PathProgramCache]: Analyzing trace with hash -1567424083, now seen corresponding path program 8 times [2022-11-23 14:59:35,649 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:59:35,649 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1768017024] [2022-11-23 14:59:35,649 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:59:35,649 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:59:35,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:59:35,840 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 3 proven. 13 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-23 14:59:35,840 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:59:35,840 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1768017024] [2022-11-23 14:59:35,840 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1768017024] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:59:35,840 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1148328272] [2022-11-23 14:59:35,841 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 14:59:35,841 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:59:35,841 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:59:35,842 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:59:35,871 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-23 14:59:35,927 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-23 14:59:35,927 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 14:59:35,928 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-23 14:59:35,929 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:59:36,013 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-23 14:59:36,013 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:59:36,091 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-23 14:59:36,091 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1148328272] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:59:36,091 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1652077017] [2022-11-23 14:59:36,094 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-23 14:59:36,094 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:59:36,094 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:59:36,094 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:59:36,095 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:59:36,151 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-23 14:59:36,151 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 26 treesize of output 46 [2022-11-23 14:59:36,208 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-23 14:59:36,209 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-23 14:59:36,237 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 [2022-11-23 14:59:36,310 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:59:36,311 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:59:36,332 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-23 14:59:36,333 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 245 treesize of output 248 [2022-11-23 14:59:36,441 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 [2022-11-23 14:59:36,530 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:59:36,805 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1451#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-23 14:59:36,805 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:59:36,805 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:59:36,805 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 17 [2022-11-23 14:59:36,805 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [439282846] [2022-11-23 14:59:36,806 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:59:36,806 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-11-23 14:59:36,806 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:59:36,806 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-11-23 14:59:36,807 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=367, Unknown=0, NotChecked=0, Total=462 [2022-11-23 14:59:36,807 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand has 17 states, 17 states have (on average 1.411764705882353) internal successors, (24), 17 states have internal predecessors, (24), 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) [2022-11-23 14:59:36,985 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:59:36,986 INFO L93 Difference]: Finished difference Result 23 states and 25 transitions. [2022-11-23 14:59:36,986 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-23 14:59:36,986 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.411764705882353) internal successors, (24), 17 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2022-11-23 14:59:36,986 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:59:36,988 INFO L225 Difference]: With dead ends: 23 [2022-11-23 14:59:36,988 INFO L226 Difference]: Without dead ends: 20 [2022-11-23 14:59:36,989 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 31 SyntacticMatches, 12 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 350 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=148, Invalid=608, Unknown=0, NotChecked=0, Total=756 [2022-11-23 14:59:36,989 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 14 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 120 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 151 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 120 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 14:59:36,990 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 15 Invalid, 151 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 120 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 14:59:36,990 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2022-11-23 14:59:36,996 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2022-11-23 14:59:36,996 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 19 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:59:36,996 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2022-11-23 14:59:36,996 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 18 [2022-11-23 14:59:36,996 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:59:36,997 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2022-11-23 14:59:36,997 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 1.411764705882353) internal successors, (24), 17 states have internal predecessors, (24), 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) [2022-11-23 14:59:36,997 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2022-11-23 14:59:36,997 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-11-23 14:59:36,997 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:59:36,997 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:59:37,011 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-23 14:59:37,203 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-11-23 14:59:37,203 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:59:37,204 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:59:37,204 INFO L85 PathProgramCache]: Analyzing trace with hash -1345662009, now seen corresponding path program 9 times [2022-11-23 14:59:37,204 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:59:37,204 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1314699035] [2022-11-23 14:59:37,204 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:59:37,204 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:59:37,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:59:38,567 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:59:38,567 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:59:38,567 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1314699035] [2022-11-23 14:59:38,567 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1314699035] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:59:38,568 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1337284038] [2022-11-23 14:59:38,568 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 14:59:38,568 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:59:38,568 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:59:38,571 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:59:38,603 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-23 14:59:38,680 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 14:59:38,680 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 14:59:38,682 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 49 conjunts are in the unsatisfiable core [2022-11-23 14:59:38,683 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:59:39,187 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 4 proven. 20 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-23 14:59:39,187 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:59:39,874 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 14:59:39,875 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 69 treesize of output 185 [2022-11-23 14:59:40,450 INFO L321 Elim1Store]: treesize reduction 156, result has 9.8 percent of original size [2022-11-23 14:59:40,451 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 70 treesize of output 30 [2022-11-23 14:59:40,626 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-23 14:59:40,627 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1337284038] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:59:40,627 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [241925183] [2022-11-23 14:59:40,629 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-23 14:59:40,630 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:59:40,630 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:59:40,630 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:59:40,631 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:59:40,693 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-23 14:59:40,693 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-23 14:59:40,710 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 [2022-11-23 14:59:40,732 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 [2022-11-23 14:59:40,800 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:59:40,802 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:59:40,814 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-23 14:59:40,815 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 250 treesize of output 247 [2022-11-23 14:59:40,871 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 [2022-11-23 14:59:40,928 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:59:41,296 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1688#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-23 14:59:41,296 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:59:41,296 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:59:41,296 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 15, 14] total 39 [2022-11-23 14:59:41,296 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [149606778] [2022-11-23 14:59:41,297 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:59:41,297 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2022-11-23 14:59:41,297 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:59:41,298 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2022-11-23 14:59:41,298 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=179, Invalid=1713, Unknown=0, NotChecked=0, Total=1892 [2022-11-23 14:59:41,299 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand has 39 states, 39 states have (on average 1.205128205128205) internal successors, (47), 39 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:59:43,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:59:43,129 INFO L93 Difference]: Finished difference Result 31 states and 35 transitions. [2022-11-23 14:59:43,129 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-11-23 14:59:43,129 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 1.205128205128205) internal successors, (47), 39 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2022-11-23 14:59:43,130 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:59:43,130 INFO L225 Difference]: With dead ends: 31 [2022-11-23 14:59:43,130 INFO L226 Difference]: Without dead ends: 28 [2022-11-23 14:59:43,131 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 29 SyntacticMatches, 2 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 703 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=349, Invalid=3311, Unknown=0, NotChecked=0, Total=3660 [2022-11-23 14:59:43,132 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 14 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 569 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 607 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 569 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-23 14:59:43,132 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 55 Invalid, 607 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 569 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-23 14:59:43,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2022-11-23 14:59:43,141 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 22. [2022-11-23 14:59:43,155 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 21 states have (on average 1.1904761904761905) internal successors, (25), 21 states have internal predecessors, (25), 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) [2022-11-23 14:59:43,155 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 25 transitions. [2022-11-23 14:59:43,155 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 25 transitions. Word has length 19 [2022-11-23 14:59:43,156 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:59:43,156 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 25 transitions. [2022-11-23 14:59:43,156 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 1.205128205128205) internal successors, (47), 39 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:59:43,156 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 25 transitions. [2022-11-23 14:59:43,157 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-11-23 14:59:43,157 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:59:43,157 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:59:43,180 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-23 14:59:43,362 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-11-23 14:59:43,363 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:59:43,363 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:59:43,363 INFO L85 PathProgramCache]: Analyzing trace with hash 1378796764, now seen corresponding path program 10 times [2022-11-23 14:59:43,363 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:59:43,363 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1549126530] [2022-11-23 14:59:43,363 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:59:43,363 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:59:43,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:59:43,512 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 11 proven. 14 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-23 14:59:43,512 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:59:43,512 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1549126530] [2022-11-23 14:59:43,512 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1549126530] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:59:43,513 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1646264686] [2022-11-23 14:59:43,513 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-23 14:59:43,513 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:59:43,513 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:59:43,515 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:59:43,549 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-23 14:59:43,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:59:43,593 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-23 14:59:43,594 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:59:43,688 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-23 14:59:43,688 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:59:43,765 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-23 14:59:43,766 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1646264686] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:59:43,766 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1909728856] [2022-11-23 14:59:43,767 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-23 14:59:43,768 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:59:43,768 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:59:43,768 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:59:43,768 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:59:43,826 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-23 14:59:43,826 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-23 14:59:43,839 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 [2022-11-23 14:59:43,857 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 [2022-11-23 14:59:43,912 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:59:43,913 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:59:43,936 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-23 14:59:43,936 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 245 treesize of output 248 [2022-11-23 14:59:43,991 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-23 14:59:44,040 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:59:44,268 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1953#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-23 14:59:44,268 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:59:44,268 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:59:44,268 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 19 [2022-11-23 14:59:44,269 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [540968712] [2022-11-23 14:59:44,282 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:59:44,283 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-11-23 14:59:44,283 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:59:44,284 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-11-23 14:59:44,284 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=435, Unknown=0, NotChecked=0, Total=552 [2022-11-23 14:59:44,284 INFO L87 Difference]: Start difference. First operand 22 states and 25 transitions. Second operand has 19 states, 19 states have (on average 1.4210526315789473) internal successors, (27), 19 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) [2022-11-23 14:59:44,442 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:59:44,442 INFO L93 Difference]: Finished difference Result 45 states and 51 transitions. [2022-11-23 14:59:44,443 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-11-23 14:59:44,443 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.4210526315789473) internal successors, (27), 19 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 20 [2022-11-23 14:59:44,444 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:59:44,444 INFO L225 Difference]: With dead ends: 45 [2022-11-23 14:59:44,444 INFO L226 Difference]: Without dead ends: 26 [2022-11-23 14:59:44,445 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 39 SyntacticMatches, 9 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 310 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=172, Invalid=640, Unknown=0, NotChecked=0, Total=812 [2022-11-23 14:59:44,445 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 15 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 84 mSolverCounterSat, 67 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 151 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 67 IncrementalHoareTripleChecker+Valid, 84 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 14:59:44,446 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 19 Invalid, 151 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [67 Valid, 84 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 14:59:44,446 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2022-11-23 14:59:44,452 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 22. [2022-11-23 14:59:44,453 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 21 states have (on average 1.1428571428571428) internal successors, (24), 21 states have internal predecessors, (24), 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) [2022-11-23 14:59:44,453 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2022-11-23 14:59:44,453 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 20 [2022-11-23 14:59:44,453 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:59:44,453 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2022-11-23 14:59:44,454 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.4210526315789473) internal successors, (27), 19 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) [2022-11-23 14:59:44,454 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2022-11-23 14:59:44,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-11-23 14:59:44,454 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:59:44,454 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:59:44,459 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-23 14:59:44,655 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-11-23 14:59:44,655 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:59:44,655 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:59:44,656 INFO L85 PathProgramCache]: Analyzing trace with hash 1249470716, now seen corresponding path program 11 times [2022-11-23 14:59:44,656 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:59:44,656 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [682960893] [2022-11-23 14:59:44,656 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:59:44,656 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:59:44,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:59:44,867 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 6 proven. 19 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-23 14:59:44,867 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:59:44,867 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [682960893] [2022-11-23 14:59:44,867 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [682960893] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:59:44,868 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1110795990] [2022-11-23 14:59:44,868 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 14:59:44,868 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:59:44,868 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:59:44,869 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:59:44,896 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-23 14:59:44,952 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-23 14:59:44,952 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 14:59:44,953 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-23 14:59:44,955 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:59:45,069 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-23 14:59:45,069 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:59:45,174 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-23 14:59:45,174 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1110795990] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:59:45,174 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [756130777] [2022-11-23 14:59:45,176 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-23 14:59:45,176 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:59:45,176 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:59:45,176 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:59:45,176 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:59:45,231 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-23 14:59:45,232 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 26 treesize of output 46 [2022-11-23 14:59:45,288 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-23 14:59:45,289 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-23 14:59:45,313 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-23 14:59:45,367 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:59:45,368 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:59:45,390 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-23 14:59:45,391 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 245 treesize of output 248 [2022-11-23 14:59:45,476 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-23 14:59:45,540 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:59:45,843 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2226#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-23 14:59:45,843 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:59:45,843 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:59:45,843 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2022-11-23 14:59:45,843 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [550380043] [2022-11-23 14:59:45,843 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:59:45,847 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-11-23 14:59:45,847 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:59:45,848 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-11-23 14:59:45,848 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=121, Invalid=479, Unknown=0, NotChecked=0, Total=600 [2022-11-23 14:59:45,849 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand has 20 states, 20 states have (on average 1.35) internal successors, (27), 20 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) [2022-11-23 14:59:46,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:59:46,019 INFO L93 Difference]: Finished difference Result 26 states and 28 transitions. [2022-11-23 14:59:46,023 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-23 14:59:46,023 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.35) internal successors, (27), 20 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 21 [2022-11-23 14:59:46,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:59:46,024 INFO L225 Difference]: With dead ends: 26 [2022-11-23 14:59:46,024 INFO L226 Difference]: Without dead ends: 23 [2022-11-23 14:59:46,024 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 36 SyntacticMatches, 15 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 504 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=192, Invalid=800, Unknown=0, NotChecked=0, Total=992 [2022-11-23 14:59:46,025 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 15 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 131 mSolverCounterSat, 42 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 173 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 42 IncrementalHoareTripleChecker+Valid, 131 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 14:59:46,025 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 13 Invalid, 173 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [42 Valid, 131 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 14:59:46,026 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2022-11-23 14:59:46,033 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2022-11-23 14:59:46,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 22 states have (on average 1.1363636363636365) internal successors, (25), 22 states have internal predecessors, (25), 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) [2022-11-23 14:59:46,034 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2022-11-23 14:59:46,034 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 21 [2022-11-23 14:59:46,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:59:46,035 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2022-11-23 14:59:46,035 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.35) internal successors, (27), 20 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) [2022-11-23 14:59:46,035 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2022-11-23 14:59:46,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-11-23 14:59:46,036 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:59:46,036 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:59:46,041 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-11-23 14:59:46,241 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:59:46,241 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:59:46,242 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:59:46,242 INFO L85 PathProgramCache]: Analyzing trace with hash 78730840, now seen corresponding path program 12 times [2022-11-23 14:59:46,242 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:59:46,242 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1247578905] [2022-11-23 14:59:46,243 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:59:46,243 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:59:46,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:59:48,027 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 1 proven. 44 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:59:48,027 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:59:48,027 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1247578905] [2022-11-23 14:59:48,027 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1247578905] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:59:48,027 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1723920033] [2022-11-23 14:59:48,028 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 14:59:48,028 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:59:48,028 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:59:48,029 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:59:48,032 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-23 14:59:48,107 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 14:59:48,107 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 14:59:48,109 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 58 conjunts are in the unsatisfiable core [2022-11-23 14:59:48,111 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:59:48,799 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 5 proven. 30 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-23 14:59:48,800 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:59:49,848 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 14:59:49,849 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 0 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 45 case distinctions, treesize of input 86 treesize of output 285 [2022-11-23 14:59:51,532 INFO L321 Elim1Store]: treesize reduction 250, result has 7.7 percent of original size [2022-11-23 14:59:51,532 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 0 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 45 case distinctions, treesize of input 87 treesize of output 36 [2022-11-23 14:59:51,754 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-23 14:59:51,754 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1723920033] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:59:51,755 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1140060226] [2022-11-23 14:59:51,757 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-23 14:59:51,758 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:59:51,758 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:59:51,758 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:59:51,758 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:59:51,824 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-23 14:59:51,825 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-23 14:59:51,838 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 [2022-11-23 14:59:51,858 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 [2022-11-23 14:59:51,909 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:59:51,911 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:59:51,923 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-23 14:59:51,923 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 250 treesize of output 247 [2022-11-23 14:59:51,970 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 [2022-11-23 14:59:52,025 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:59:52,874 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2503#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-23 14:59:52,874 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:59:52,874 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:59:52,874 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 17, 17] total 47 [2022-11-23 14:59:52,874 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1514648027] [2022-11-23 14:59:52,874 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:59:52,875 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2022-11-23 14:59:52,875 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:59:52,876 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2022-11-23 14:59:52,876 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=230, Invalid=2422, Unknown=0, NotChecked=0, Total=2652 [2022-11-23 14:59:52,877 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand has 47 states, 47 states have (on average 1.1702127659574468) internal successors, (55), 47 states have internal predecessors, (55), 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) [2022-11-23 14:59:55,560 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:59:55,560 INFO L93 Difference]: Finished difference Result 37 states and 40 transitions. [2022-11-23 14:59:55,561 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-11-23 14:59:55,561 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 1.1702127659574468) internal successors, (55), 47 states have internal predecessors, (55), 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 [2022-11-23 14:59:55,561 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:59:55,562 INFO L225 Difference]: With dead ends: 37 [2022-11-23 14:59:55,562 INFO L226 Difference]: Without dead ends: 34 [2022-11-23 14:59:55,563 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 27 SyntacticMatches, 8 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1268 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=510, Invalid=4746, Unknown=0, NotChecked=0, Total=5256 [2022-11-23 14:59:55,564 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 18 mSDsluCounter, 81 mSDsCounter, 0 mSdLazyCounter, 528 mSolverCounterSat, 69 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 86 SdHoareTripleChecker+Invalid, 597 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 69 IncrementalHoareTripleChecker+Valid, 528 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-23 14:59:55,564 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 86 Invalid, 597 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [69 Valid, 528 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-23 14:59:55,566 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2022-11-23 14:59:55,577 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 25. [2022-11-23 14:59:55,578 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 24 states have (on average 1.1666666666666667) internal successors, (28), 24 states have internal predecessors, (28), 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) [2022-11-23 14:59:55,578 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 28 transitions. [2022-11-23 14:59:55,578 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 28 transitions. Word has length 22 [2022-11-23 14:59:55,579 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:59:55,579 INFO L495 AbstractCegarLoop]: Abstraction has 25 states and 28 transitions. [2022-11-23 14:59:55,579 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 1.1702127659574468) internal successors, (55), 47 states have internal predecessors, (55), 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) [2022-11-23 14:59:55,579 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 28 transitions. [2022-11-23 14:59:55,580 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-11-23 14:59:55,580 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:59:55,580 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:59:55,587 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2022-11-23 14:59:55,785 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:59:55,785 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:59:55,786 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:59:55,786 INFO L85 PathProgramCache]: Analyzing trace with hash -1660579219, now seen corresponding path program 13 times [2022-11-23 14:59:55,786 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:59:55,786 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2083864256] [2022-11-23 14:59:55,786 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:59:55,786 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:59:55,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:59:55,977 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 16 proven. 20 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-23 14:59:55,977 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:59:55,978 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2083864256] [2022-11-23 14:59:55,978 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2083864256] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:59:55,978 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [321275992] [2022-11-23 14:59:55,978 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-23 14:59:55,978 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:59:55,978 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:59:55,983 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:59:56,006 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-23 14:59:56,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:59:56,059 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 14 conjunts are in the unsatisfiable core [2022-11-23 14:59:56,060 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:59:56,192 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-23 14:59:56,192 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:59:56,294 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-23 14:59:56,295 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [321275992] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:59:56,295 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [339857554] [2022-11-23 14:59:56,296 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-23 14:59:56,296 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:59:56,296 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:59:56,297 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:59:56,297 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:59:56,357 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-23 14:59:56,358 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-23 14:59:56,368 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 [2022-11-23 14:59:56,390 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 [2022-11-23 14:59:56,444 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:59:56,446 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:59:56,458 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-23 14:59:56,459 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 250 treesize of output 247 [2022-11-23 14:59:56,504 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 [2022-11-23 14:59:56,576 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:59:56,965 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2812#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-23 14:59:56,965 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:59:56,965 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:59:56,965 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 22 [2022-11-23 14:59:56,965 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1782980587] [2022-11-23 14:59:56,966 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:59:56,966 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-11-23 14:59:56,966 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:59:56,966 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-11-23 14:59:56,967 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=148, Invalid=554, Unknown=0, NotChecked=0, Total=702 [2022-11-23 14:59:56,967 INFO L87 Difference]: Start difference. First operand 25 states and 28 transitions. Second operand has 22 states, 22 states have (on average 1.3636363636363635) internal successors, (30), 22 states have internal predecessors, (30), 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) [2022-11-23 14:59:57,180 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:59:57,180 INFO L93 Difference]: Finished difference Result 51 states and 57 transitions. [2022-11-23 14:59:57,182 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-11-23 14:59:57,182 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.3636363636363635) internal successors, (30), 22 states have internal predecessors, (30), 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 [2022-11-23 14:59:57,182 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:59:57,182 INFO L225 Difference]: With dead ends: 51 [2022-11-23 14:59:57,182 INFO L226 Difference]: Without dead ends: 29 [2022-11-23 14:59:57,183 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 39 SyntacticMatches, 17 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 532 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=223, Invalid=833, Unknown=0, NotChecked=0, Total=1056 [2022-11-23 14:59:57,184 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 19 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 96 mSolverCounterSat, 77 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 173 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 77 IncrementalHoareTripleChecker+Valid, 96 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 14:59:57,184 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 17 Invalid, 173 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [77 Valid, 96 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 14:59:57,185 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2022-11-23 14:59:57,195 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 25. [2022-11-23 14:59:57,195 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 24 states have (on average 1.125) internal successors, (27), 24 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) [2022-11-23 14:59:57,196 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2022-11-23 14:59:57,196 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 23 [2022-11-23 14:59:57,196 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:59:57,196 INFO L495 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2022-11-23 14:59:57,196 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 1.3636363636363635) internal successors, (30), 22 states have internal predecessors, (30), 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) [2022-11-23 14:59:57,196 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2022-11-23 14:59:57,197 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-11-23 14:59:57,197 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:59:57,197 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 5, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:59:57,202 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-11-23 14:59:57,402 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-11-23 14:59:57,402 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:59:57,403 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:59:57,403 INFO L85 PathProgramCache]: Analyzing trace with hash -1827210675, now seen corresponding path program 14 times [2022-11-23 14:59:57,403 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:59:57,403 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [654834735] [2022-11-23 14:59:57,403 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:59:57,403 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:59:57,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:59:57,601 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 10 proven. 26 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-11-23 14:59:57,601 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:59:57,601 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [654834735] [2022-11-23 14:59:57,602 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [654834735] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:59:57,602 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [601323793] [2022-11-23 14:59:57,602 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 14:59:57,602 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:59:57,602 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:59:57,607 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:59:57,626 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-23 14:59:57,699 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-23 14:59:57,700 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 14:59:57,701 INFO L263 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 14 conjunts are in the unsatisfiable core [2022-11-23 14:59:57,702 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:59:57,835 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 15 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-11-23 14:59:57,835 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:59:57,964 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 15 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-11-23 14:59:57,964 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [601323793] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:59:57,965 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [333441677] [2022-11-23 14:59:57,966 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-23 14:59:57,966 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:59:57,966 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:59:57,967 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:59:57,967 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:59:58,028 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-23 14:59:58,028 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-23 14:59:58,040 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 [2022-11-23 14:59:58,063 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 [2022-11-23 14:59:58,115 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:59:58,117 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:59:58,129 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-23 14:59:58,129 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 250 treesize of output 247 [2022-11-23 14:59:58,171 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 16 treesize of output 12 [2022-11-23 14:59:58,219 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:59:58,432 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3126#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-23 14:59:58,432 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:59:58,433 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:59:58,433 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 23 [2022-11-23 14:59:58,433 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1320731507] [2022-11-23 14:59:58,433 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:59:58,433 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-11-23 14:59:58,433 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:59:58,434 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-11-23 14:59:58,434 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=151, Invalid=605, Unknown=0, NotChecked=0, Total=756 [2022-11-23 14:59:58,434 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand has 23 states, 23 states have (on average 1.3043478260869565) internal successors, (30), 23 states have internal predecessors, (30), 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) [2022-11-23 14:59:58,654 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:59:58,655 INFO L93 Difference]: Finished difference Result 29 states and 31 transitions. [2022-11-23 14:59:58,655 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-11-23 14:59:58,655 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.3043478260869565) internal successors, (30), 23 states have internal predecessors, (30), 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 24 [2022-11-23 14:59:58,655 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:59:58,656 INFO L225 Difference]: With dead ends: 29 [2022-11-23 14:59:58,656 INFO L226 Difference]: Without dead ends: 26 [2022-11-23 14:59:58,656 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 47 SyntacticMatches, 12 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 528 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=243, Invalid=1017, Unknown=0, NotChecked=0, Total=1260 [2022-11-23 14:59:58,657 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 16 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 163 mSolverCounterSat, 49 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 212 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 49 IncrementalHoareTripleChecker+Valid, 163 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 14:59:58,657 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 17 Invalid, 212 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [49 Valid, 163 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 14:59:58,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2022-11-23 14:59:58,667 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2022-11-23 14:59:58,667 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 25 states have (on average 1.12) internal successors, (28), 25 states have internal predecessors, (28), 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) [2022-11-23 14:59:58,668 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2022-11-23 14:59:58,668 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 24 [2022-11-23 14:59:58,669 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:59:58,669 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2022-11-23 14:59:58,669 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.3043478260869565) internal successors, (30), 23 states have internal predecessors, (30), 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) [2022-11-23 14:59:58,669 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2022-11-23 14:59:58,670 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-11-23 14:59:58,670 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:59:58,670 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:59:58,679 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-11-23 14:59:58,876 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-11-23 14:59:58,876 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:59:58,877 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:59:58,877 INFO L85 PathProgramCache]: Analyzing trace with hash -809111769, now seen corresponding path program 15 times [2022-11-23 14:59:58,877 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:59:58,877 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2067602740] [2022-11-23 14:59:58,877 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:59:58,877 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:59:58,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:00:00,761 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 63 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 15:00:00,762 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:00:00,762 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2067602740] [2022-11-23 15:00:00,762 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2067602740] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:00:00,762 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [520179452] [2022-11-23 15:00:00,762 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 15:00:00,762 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:00:00,762 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:00:00,763 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:00:00,765 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-23 15:00:00,842 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 15:00:00,842 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 15:00:00,844 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 64 conjunts are in the unsatisfiable core [2022-11-23 15:00:00,846 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:00:01,794 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 6 proven. 42 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-23 15:00:01,794 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:00:03,305 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 15:00:03,305 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 104 treesize of output 408 [2022-11-23 15:00:07,497 INFO L321 Elim1Store]: treesize reduction 366, result has 6.4 percent of original size [2022-11-23 15:00:07,498 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 103 treesize of output 41 [2022-11-23 15:00:07,703 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 48 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-23 15:00:07,703 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [520179452] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:00:07,703 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [938099477] [2022-11-23 15:00:07,705 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-23 15:00:07,705 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:00:07,705 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:00:07,705 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:00:07,706 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:00:07,781 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-23 15:00:07,781 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-23 15:00:07,794 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 [2022-11-23 15:00:07,817 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 [2022-11-23 15:00:07,866 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:00:07,867 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 15:00:07,889 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-23 15:00:07,890 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 245 treesize of output 248 [2022-11-23 15:00:07,970 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 [2022-11-23 15:00:08,021 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:00:08,512 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3441#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-23 15:00:08,512 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:00:08,512 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:00:08,512 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 19, 18] total 53 [2022-11-23 15:00:08,512 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [44508507] [2022-11-23 15:00:08,513 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:00:08,513 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2022-11-23 15:00:08,513 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:00:08,514 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2022-11-23 15:00:08,515 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=247, Invalid=3059, Unknown=0, NotChecked=0, Total=3306 [2022-11-23 15:00:08,515 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand has 53 states, 53 states have (on average 1.150943396226415) internal successors, (61), 53 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:00:12,030 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:00:12,030 INFO L93 Difference]: Finished difference Result 41 states and 44 transitions. [2022-11-23 15:00:12,030 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-11-23 15:00:12,030 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 1.150943396226415) internal successors, (61), 53 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 25 [2022-11-23 15:00:12,031 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:00:12,031 INFO L225 Difference]: With dead ends: 41 [2022-11-23 15:00:12,031 INFO L226 Difference]: Without dead ends: 38 [2022-11-23 15:00:12,034 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 39 SyntacticMatches, 2 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1094 ImplicationChecksByTransitivity, 5.8s TimeCoverageRelationStatistics Valid=509, Invalid=5971, Unknown=0, NotChecked=0, Total=6480 [2022-11-23 15:00:12,035 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 21 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 835 mSolverCounterSat, 56 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 891 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 56 IncrementalHoareTripleChecker+Valid, 835 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-23 15:00:12,035 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [21 Valid, 70 Invalid, 891 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [56 Valid, 835 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-23 15:00:12,036 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2022-11-23 15:00:12,049 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 28. [2022-11-23 15:00:12,049 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 27 states have (on average 1.1481481481481481) internal successors, (31), 27 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) [2022-11-23 15:00:12,050 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 31 transitions. [2022-11-23 15:00:12,050 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 31 transitions. Word has length 25 [2022-11-23 15:00:12,051 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:00:12,051 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 31 transitions. [2022-11-23 15:00:12,051 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 1.150943396226415) internal successors, (61), 53 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:00:12,051 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 31 transitions. [2022-11-23 15:00:12,051 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-11-23 15:00:12,052 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:00:12,052 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:00:12,057 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-11-23 15:00:12,255 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-11-23 15:00:12,255 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:00:12,255 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:00:12,255 INFO L85 PathProgramCache]: Analyzing trace with hash -1892231748, now seen corresponding path program 16 times [2022-11-23 15:00:12,255 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:00:12,256 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1039135314] [2022-11-23 15:00:12,256 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:00:12,256 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:00:12,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:00:12,449 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 22 proven. 27 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-11-23 15:00:12,449 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:00:12,449 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1039135314] [2022-11-23 15:00:12,449 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1039135314] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:00:12,449 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1680653942] [2022-11-23 15:00:12,450 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-23 15:00:12,450 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:00:12,450 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:00:12,455 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:00:12,475 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-11-23 15:00:12,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:00:12,539 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 16 conjunts are in the unsatisfiable core [2022-11-23 15:00:12,540 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:00:12,703 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-11-23 15:00:12,703 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:00:12,837 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-11-23 15:00:12,838 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1680653942] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:00:12,838 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [615208907] [2022-11-23 15:00:12,839 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-23 15:00:12,839 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:00:12,839 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:00:12,840 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:00:12,840 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:00:12,902 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-23 15:00:12,902 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-23 15:00:12,914 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 [2022-11-23 15:00:12,938 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 [2022-11-23 15:00:12,988 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:00:12,990 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:00:13,003 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-23 15:00:13,004 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 250 treesize of output 247 [2022-11-23 15:00:13,048 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 [2022-11-23 15:00:13,099 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:00:13,349 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3789#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-23 15:00:13,350 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:00:13,350 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:00:13,350 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 25 [2022-11-23 15:00:13,350 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [32693720] [2022-11-23 15:00:13,350 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:00:13,350 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-11-23 15:00:13,351 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:00:13,351 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-11-23 15:00:13,351 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=183, Invalid=687, Unknown=0, NotChecked=0, Total=870 [2022-11-23 15:00:13,351 INFO L87 Difference]: Start difference. First operand 28 states and 31 transitions. Second operand has 25 states, 25 states have (on average 1.32) internal successors, (33), 25 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) [2022-11-23 15:00:13,554 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:00:13,555 INFO L93 Difference]: Finished difference Result 57 states and 63 transitions. [2022-11-23 15:00:13,556 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-11-23 15:00:13,556 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.32) internal successors, (33), 25 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 26 [2022-11-23 15:00:13,556 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:00:13,556 INFO L225 Difference]: With dead ends: 57 [2022-11-23 15:00:13,556 INFO L226 Difference]: Without dead ends: 32 [2022-11-23 15:00:13,557 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 51 SyntacticMatches, 13 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 527 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=281, Invalid=1051, Unknown=0, NotChecked=0, Total=1332 [2022-11-23 15:00:13,558 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 11 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 116 mSolverCounterSat, 84 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 200 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 84 IncrementalHoareTripleChecker+Valid, 116 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 15:00:13,558 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 23 Invalid, 200 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [84 Valid, 116 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 15:00:13,558 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2022-11-23 15:00:13,580 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 28. [2022-11-23 15:00:13,580 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 27 states have (on average 1.1111111111111112) internal successors, (30), 27 states have internal predecessors, (30), 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) [2022-11-23 15:00:13,581 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2022-11-23 15:00:13,581 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 26 [2022-11-23 15:00:13,581 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:00:13,581 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2022-11-23 15:00:13,582 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.32) internal successors, (33), 25 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) [2022-11-23 15:00:13,582 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2022-11-23 15:00:13,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-11-23 15:00:13,582 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:00:13,583 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 6, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:00:13,588 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-11-23 15:00:13,787 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-11-23 15:00:13,787 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:00:13,787 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:00:13,787 INFO L85 PathProgramCache]: Analyzing trace with hash -1027743268, now seen corresponding path program 17 times [2022-11-23 15:00:13,787 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:00:13,787 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1673402329] [2022-11-23 15:00:13,788 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:00:13,788 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:00:13,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:00:14,025 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 15 proven. 34 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-11-23 15:00:14,025 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:00:14,025 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1673402329] [2022-11-23 15:00:14,025 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1673402329] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:00:14,025 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2029096278] [2022-11-23 15:00:14,025 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 15:00:14,026 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:00:14,026 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:00:14,027 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:00:14,031 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-11-23 15:00:14,143 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-11-23 15:00:14,144 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 15:00:14,145 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 16 conjunts are in the unsatisfiable core [2022-11-23 15:00:14,147 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:00:14,327 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 21 proven. 28 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-11-23 15:00:14,327 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:00:14,483 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 21 proven. 28 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-11-23 15:00:14,483 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2029096278] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:00:14,483 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [964548978] [2022-11-23 15:00:14,484 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-23 15:00:14,484 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:00:14,485 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:00:14,485 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:00:14,485 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:00:14,539 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-23 15:00:14,539 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 26 treesize of output 46 [2022-11-23 15:00:14,605 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-23 15:00:14,605 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-23 15:00:14,630 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 [2022-11-23 15:00:14,681 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:00:14,684 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:00:14,695 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-23 15:00:14,696 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 250 treesize of output 247 [2022-11-23 15:00:14,741 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 [2022-11-23 15:00:14,813 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:00:15,178 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4144#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-23 15:00:15,179 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:00:15,179 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:00:15,179 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 26 [2022-11-23 15:00:15,179 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [390735618] [2022-11-23 15:00:15,179 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:00:15,179 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-11-23 15:00:15,179 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:00:15,180 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-11-23 15:00:15,180 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=745, Unknown=0, NotChecked=0, Total=930 [2022-11-23 15:00:15,181 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand has 26 states, 26 states have (on average 1.2692307692307692) internal successors, (33), 26 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) [2022-11-23 15:00:15,437 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:00:15,438 INFO L93 Difference]: Finished difference Result 32 states and 34 transitions. [2022-11-23 15:00:15,438 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-11-23 15:00:15,438 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.2692307692307692) internal successors, (33), 26 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 27 [2022-11-23 15:00:15,438 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:00:15,439 INFO L225 Difference]: With dead ends: 32 [2022-11-23 15:00:15,439 INFO L226 Difference]: Without dead ends: 29 [2022-11-23 15:00:15,439 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 46 SyntacticMatches, 21 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 890 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=301, Invalid=1259, Unknown=0, NotChecked=0, Total=1560 [2022-11-23 15:00:15,440 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 23 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 161 mSolverCounterSat, 78 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 239 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 78 IncrementalHoareTripleChecker+Valid, 161 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 15:00:15,440 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [23 Valid, 11 Invalid, 239 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [78 Valid, 161 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 15:00:15,441 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2022-11-23 15:00:15,466 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2022-11-23 15:00:15,467 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 28 states have (on average 1.1071428571428572) internal successors, (31), 28 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) [2022-11-23 15:00:15,467 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2022-11-23 15:00:15,467 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 27 [2022-11-23 15:00:15,468 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:00:15,468 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2022-11-23 15:00:15,468 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 1.2692307692307692) internal successors, (33), 26 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) [2022-11-23 15:00:15,468 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2022-11-23 15:00:15,469 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-11-23 15:00:15,469 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:00:15,469 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 7, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:00:15,487 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-11-23 15:00:15,679 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:00:15,680 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:00:15,680 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:00:15,680 INFO L85 PathProgramCache]: Analyzing trace with hash -1795425928, now seen corresponding path program 18 times [2022-11-23 15:00:15,680 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:00:15,680 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1343786207] [2022-11-23 15:00:15,680 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:00:15,680 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:00:15,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:00:18,584 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 15:00:18,585 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:00:18,585 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1343786207] [2022-11-23 15:00:18,585 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1343786207] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:00:18,585 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [360105032] [2022-11-23 15:00:18,585 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 15:00:18,586 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:00:18,586 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:00:18,587 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:00:18,589 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-11-23 15:00:18,673 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 15:00:18,674 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 15:00:18,676 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 66 conjunts are in the unsatisfiable core [2022-11-23 15:00:18,678 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:00:19,811 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-11-23 15:00:19,811 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:00:21,835 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 15:00:21,835 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 14 select indices, 14 select index equivalence classes, 0 disjoint index pairs (out of 91 index pairs), introduced 14 new quantified variables, introduced 91 case distinctions, treesize of input 121 treesize of output 552 [2022-11-23 15:00:30,587 INFO L321 Elim1Store]: treesize reduction 504, result has 5.4 percent of original size [2022-11-23 15:00:30,587 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 14 select indices, 14 select index equivalence classes, 0 disjoint index pairs (out of 91 index pairs), introduced 14 new quantified variables, introduced 91 case distinctions, treesize of input 120 treesize of output 47 [2022-11-23 15:00:30,679 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-11-23 15:00:30,680 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [360105032] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:00:30,680 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [82868132] [2022-11-23 15:00:30,682 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-23 15:00:30,682 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:00:30,682 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:00:30,682 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:00:30,683 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:00:30,734 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-23 15:00:30,734 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 26 treesize of output 46 [2022-11-23 15:00:30,783 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-23 15:00:30,783 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-23 15:00:30,807 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 [2022-11-23 15:00:30,853 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:00:30,854 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 15:00:30,875 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-23 15:00:30,876 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 245 treesize of output 248 [2022-11-23 15:00:30,937 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 [2022-11-23 15:00:30,988 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:00:32,205 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4496#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-23 15:00:32,205 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:00:32,205 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:00:32,206 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 20, 19] total 58 [2022-11-23 15:00:32,206 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [613040682] [2022-11-23 15:00:32,206 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:00:32,207 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2022-11-23 15:00:32,207 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:00:32,207 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2022-11-23 15:00:32,208 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=202, Invalid=3704, Unknown=0, NotChecked=0, Total=3906 [2022-11-23 15:00:32,208 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand has 58 states, 58 states have (on average 1.1379310344827587) internal successors, (66), 58 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) [2022-11-23 15:00:35,032 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:00:35,033 INFO L93 Difference]: Finished difference Result 45 states and 48 transitions. [2022-11-23 15:00:35,033 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-11-23 15:00:35,033 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 1.1379310344827587) internal successors, (66), 58 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 28 [2022-11-23 15:00:35,033 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:00:35,034 INFO L225 Difference]: With dead ends: 45 [2022-11-23 15:00:35,034 INFO L226 Difference]: Without dead ends: 42 [2022-11-23 15:00:35,036 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 38 SyntacticMatches, 10 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1373 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=323, Invalid=5839, Unknown=0, NotChecked=0, Total=6162 [2022-11-23 15:00:35,036 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 10 mSDsluCounter, 132 mSDsCounter, 0 mSdLazyCounter, 1017 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 137 SdHoareTripleChecker+Invalid, 1030 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 1017 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-11-23 15:00:35,037 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 137 Invalid, 1030 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 1017 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-11-23 15:00:35,037 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2022-11-23 15:00:35,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 31. [2022-11-23 15:00:35,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 30 states have (on average 1.1333333333333333) internal successors, (34), 30 states have internal predecessors, (34), 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) [2022-11-23 15:00:35,053 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 34 transitions. [2022-11-23 15:00:35,054 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 34 transitions. Word has length 28 [2022-11-23 15:00:35,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:00:35,054 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 34 transitions. [2022-11-23 15:00:35,054 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 58 states have (on average 1.1379310344827587) internal successors, (66), 58 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) [2022-11-23 15:00:35,054 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 34 transitions. [2022-11-23 15:00:35,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-11-23 15:00:35,055 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:00:35,055 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:00:35,063 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-11-23 15:00:35,258 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:00:35,258 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:00:35,259 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:00:35,259 INFO L85 PathProgramCache]: Analyzing trace with hash 1818729229, now seen corresponding path program 19 times [2022-11-23 15:00:35,259 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:00:35,259 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [387439910] [2022-11-23 15:00:35,259 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:00:35,259 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:00:35,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:00:35,488 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 29 proven. 35 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-11-23 15:00:35,488 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:00:35,488 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [387439910] [2022-11-23 15:00:35,488 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [387439910] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:00:35,488 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [545820825] [2022-11-23 15:00:35,488 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-23 15:00:35,489 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:00:35,489 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:00:35,491 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:00:35,515 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-11-23 15:00:35,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:00:35,585 INFO L263 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-23 15:00:35,586 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:00:35,771 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 36 proven. 28 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-11-23 15:00:35,771 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:00:35,910 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 36 proven. 28 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-11-23 15:00:35,910 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [545820825] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:00:35,910 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1183225858] [2022-11-23 15:00:35,911 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-23 15:00:35,911 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:00:35,911 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:00:35,911 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:00:35,911 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:00:35,958 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-23 15:00:35,959 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 26 treesize of output 46 [2022-11-23 15:00:36,031 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-23 15:00:36,032 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-23 15:00:36,053 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 [2022-11-23 15:00:36,104 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:00:36,106 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:00:36,118 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-23 15:00:36,118 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 250 treesize of output 247 [2022-11-23 15:00:36,161 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-23 15:00:36,221 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:00:36,666 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4865#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-23 15:00:36,666 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:00:36,666 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:00:36,667 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 28 [2022-11-23 15:00:36,667 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1413018069] [2022-11-23 15:00:36,667 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:00:36,667 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-11-23 15:00:36,668 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:00:36,668 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-11-23 15:00:36,668 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=834, Unknown=0, NotChecked=0, Total=1056 [2022-11-23 15:00:36,669 INFO L87 Difference]: Start difference. First operand 31 states and 34 transitions. Second operand has 28 states, 28 states have (on average 1.2857142857142858) internal successors, (36), 28 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) [2022-11-23 15:00:36,944 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:00:36,944 INFO L93 Difference]: Finished difference Result 63 states and 69 transitions. [2022-11-23 15:00:36,944 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-11-23 15:00:36,945 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.2857142857142858) internal successors, (36), 28 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 29 [2022-11-23 15:00:36,945 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:00:36,945 INFO L225 Difference]: With dead ends: 63 [2022-11-23 15:00:36,945 INFO L226 Difference]: Without dead ends: 35 [2022-11-23 15:00:36,946 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 49 SyntacticMatches, 23 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 863 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=346, Invalid=1294, Unknown=0, NotChecked=0, Total=1640 [2022-11-23 15:00:36,946 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 11 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 211 mSolverCounterSat, 75 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 286 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 75 IncrementalHoareTripleChecker+Valid, 211 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 15:00:36,947 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 25 Invalid, 286 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [75 Valid, 211 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 15:00:36,947 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2022-11-23 15:00:36,963 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 31. [2022-11-23 15:00:36,963 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 30 states have (on average 1.1) internal successors, (33), 30 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) [2022-11-23 15:00:36,963 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 33 transitions. [2022-11-23 15:00:36,963 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 33 transitions. Word has length 29 [2022-11-23 15:00:36,963 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:00:36,964 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 33 transitions. [2022-11-23 15:00:36,964 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 1.2857142857142858) internal successors, (36), 28 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) [2022-11-23 15:00:36,964 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 33 transitions. [2022-11-23 15:00:36,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-11-23 15:00:36,964 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:00:36,964 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 7, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:00:36,971 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-11-23 15:00:37,165 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:00:37,165 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:00:37,165 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:00:37,165 INFO L85 PathProgramCache]: Analyzing trace with hash -1123837203, now seen corresponding path program 20 times [2022-11-23 15:00:37,165 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:00:37,165 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1419543901] [2022-11-23 15:00:37,166 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:00:37,166 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:00:37,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:00:37,446 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 21 proven. 43 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-23 15:00:37,447 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:00:37,447 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1419543901] [2022-11-23 15:00:37,447 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1419543901] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:00:37,447 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1115758375] [2022-11-23 15:00:37,448 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 15:00:37,448 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:00:37,448 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:00:37,451 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:00:37,477 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-11-23 15:00:37,579 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-11-23 15:00:37,579 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 15:00:37,581 INFO L263 TraceCheckSpWp]: Trace formula consists of 192 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-23 15:00:37,582 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:00:37,758 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 28 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-23 15:00:37,758 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:00:37,923 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 28 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-23 15:00:37,924 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1115758375] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:00:37,924 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [767781603] [2022-11-23 15:00:37,925 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-23 15:00:37,925 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:00:37,926 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:00:37,926 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:00:37,926 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:00:37,993 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-23 15:00:37,994 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 26 treesize of output 46 [2022-11-23 15:00:38,050 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-23 15:00:38,051 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-23 15:00:38,071 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 [2022-11-23 15:00:38,126 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:00:38,128 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:00:38,140 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-23 15:00:38,141 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 250 treesize of output 247 [2022-11-23 15:00:38,183 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 [2022-11-23 15:00:38,234 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:00:38,629 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5261#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-23 15:00:38,629 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:00:38,630 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:00:38,630 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 29 [2022-11-23 15:00:38,630 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1731308063] [2022-11-23 15:00:38,630 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:00:38,630 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-11-23 15:00:38,630 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:00:38,631 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-11-23 15:00:38,631 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=223, Invalid=899, Unknown=0, NotChecked=0, Total=1122 [2022-11-23 15:00:38,631 INFO L87 Difference]: Start difference. First operand 31 states and 33 transitions. Second operand has 29 states, 29 states have (on average 1.2413793103448276) internal successors, (36), 29 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) [2022-11-23 15:00:38,899 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:00:38,900 INFO L93 Difference]: Finished difference Result 35 states and 37 transitions. [2022-11-23 15:00:38,900 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-11-23 15:00:38,900 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.2413793103448276) internal successors, (36), 29 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 30 [2022-11-23 15:00:38,900 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:00:38,901 INFO L225 Difference]: With dead ends: 35 [2022-11-23 15:00:38,901 INFO L226 Difference]: Without dead ends: 32 [2022-11-23 15:00:38,902 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 51 SyntacticMatches, 24 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1122 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=366, Invalid=1526, Unknown=0, NotChecked=0, Total=1892 [2022-11-23 15:00:38,902 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 24 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 166 mSolverCounterSat, 90 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 256 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 90 IncrementalHoareTripleChecker+Valid, 166 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 15:00:38,903 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [24 Valid, 11 Invalid, 256 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [90 Valid, 166 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 15:00:38,903 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2022-11-23 15:00:38,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2022-11-23 15:00:38,921 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 31 states have (on average 1.096774193548387) internal successors, (34), 31 states have internal predecessors, (34), 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) [2022-11-23 15:00:38,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2022-11-23 15:00:38,921 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 30 [2022-11-23 15:00:38,921 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:00:38,921 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2022-11-23 15:00:38,921 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.2413793103448276) internal successors, (36), 29 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) [2022-11-23 15:00:38,922 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2022-11-23 15:00:38,922 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-11-23 15:00:38,922 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:00:38,922 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 8, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:00:38,929 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-11-23 15:00:39,126 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2022-11-23 15:00:39,127 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:00:39,127 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:00:39,127 INFO L85 PathProgramCache]: Analyzing trace with hash -479370617, now seen corresponding path program 21 times [2022-11-23 15:00:39,127 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:00:39,127 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [601947037] [2022-11-23 15:00:39,127 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:00:39,127 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:00:39,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:00:42,597 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 10 proven. 98 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 15:00:42,597 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:00:42,597 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [601947037] [2022-11-23 15:00:42,597 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [601947037] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:00:42,597 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1542359782] [2022-11-23 15:00:42,597 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 15:00:42,598 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:00:42,598 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:00:42,598 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:00:42,601 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-11-23 15:00:42,699 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 15:00:42,699 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 15:00:42,702 WARN L261 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 109 conjunts are in the unsatisfiable core [2022-11-23 15:00:42,706 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:00:42,755 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 [2022-11-23 15:00:42,810 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 28 [2022-11-23 15:00:42,869 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 28 [2022-11-23 15:00:42,932 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 28 [2022-11-23 15:00:43,000 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 28 [2022-11-23 15:00:43,071 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 28 [2022-11-23 15:00:43,136 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 27 [2022-11-23 15:00:45,601 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 14 proven. 93 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 15:00:45,602 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:00:48,891 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 0 proven. 107 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 15:00:48,892 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1542359782] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:00:48,892 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1464189299] [2022-11-23 15:00:48,893 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-23 15:00:48,894 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:00:48,894 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:00:48,894 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:00:48,894 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:00:48,947 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-23 15:00:48,947 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-23 15:00:48,956 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 [2022-11-23 15:00:48,972 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 [2022-11-23 15:00:49,027 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:00:49,028 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 15:00:49,050 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-23 15:00:49,051 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 245 treesize of output 248 [2022-11-23 15:00:49,107 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 [2022-11-23 15:00:49,149 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:00:49,840 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5667#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-23 15:00:49,840 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:00:49,840 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:00:49,840 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29, 28] total 80 [2022-11-23 15:00:49,843 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1655772699] [2022-11-23 15:00:49,843 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:00:49,843 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 80 states [2022-11-23 15:00:49,844 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:00:49,844 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2022-11-23 15:00:49,845 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=609, Invalid=6531, Unknown=0, NotChecked=0, Total=7140 [2022-11-23 15:00:49,845 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand has 80 states, 80 states have (on average 1.0875) internal successors, (87), 80 states have internal predecessors, (87), 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) [2022-11-23 15:01:01,421 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:01:01,421 INFO L93 Difference]: Finished difference Result 55 states and 59 transitions. [2022-11-23 15:01:01,421 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-11-23 15:01:01,422 INFO L78 Accepts]: Start accepts. Automaton has has 80 states, 80 states have (on average 1.0875) internal successors, (87), 80 states have internal predecessors, (87), 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 [2022-11-23 15:01:01,422 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:01:01,422 INFO L225 Difference]: With dead ends: 55 [2022-11-23 15:01:01,422 INFO L226 Difference]: Without dead ends: 52 [2022-11-23 15:01:01,423 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 36 SyntacticMatches, 2 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3472 ImplicationChecksByTransitivity, 17.1s TimeCoverageRelationStatistics Valid=1358, Invalid=12684, Unknown=0, NotChecked=0, Total=14042 [2022-11-23 15:01:01,424 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 46 mSDsluCounter, 110 mSDsCounter, 0 mSdLazyCounter, 1193 mSolverCounterSat, 224 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 115 SdHoareTripleChecker+Invalid, 1417 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 224 IncrementalHoareTripleChecker+Valid, 1193 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2022-11-23 15:01:01,424 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [46 Valid, 115 Invalid, 1417 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [224 Valid, 1193 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2022-11-23 15:01:01,424 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2022-11-23 15:01:01,453 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 34. [2022-11-23 15:01:01,453 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 33 states have (on average 1.121212121212121) internal successors, (37), 33 states have internal predecessors, (37), 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) [2022-11-23 15:01:01,454 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 37 transitions. [2022-11-23 15:01:01,454 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 37 transitions. Word has length 31 [2022-11-23 15:01:01,454 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:01:01,454 INFO L495 AbstractCegarLoop]: Abstraction has 34 states and 37 transitions. [2022-11-23 15:01:01,455 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 80 states, 80 states have (on average 1.0875) internal successors, (87), 80 states have internal predecessors, (87), 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) [2022-11-23 15:01:01,455 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 37 transitions. [2022-11-23 15:01:01,455 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-11-23 15:01:01,455 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:01:01,455 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:01:01,461 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2022-11-23 15:01:01,658 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2022-11-23 15:01:01,659 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:01:01,659 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:01:01,659 INFO L85 PathProgramCache]: Analyzing trace with hash 1697545884, now seen corresponding path program 22 times [2022-11-23 15:01:01,659 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:01:01,659 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [219187020] [2022-11-23 15:01:01,659 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:01:01,659 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:01:01,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:01:01,992 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 37 proven. 44 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-23 15:01:01,992 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:01:01,992 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [219187020] [2022-11-23 15:01:01,992 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [219187020] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:01:01,993 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1494530642] [2022-11-23 15:01:01,993 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-23 15:01:01,993 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:01:01,993 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:01:01,994 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:01:01,999 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-11-23 15:01:02,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:01:02,087 INFO L263 TraceCheckSpWp]: Trace formula consists of 202 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-23 15:01:02,089 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:01:02,307 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 45 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-23 15:01:02,307 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:01:02,483 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 45 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-23 15:01:02,484 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1494530642] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:01:02,484 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2007275012] [2022-11-23 15:01:02,485 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-23 15:01:02,485 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:01:02,486 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:01:02,486 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:01:02,486 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:01:02,537 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-23 15:01:02,538 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 26 treesize of output 46 [2022-11-23 15:01:02,588 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-23 15:01:02,589 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-23 15:01:02,608 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 [2022-11-23 15:01:02,658 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:01:02,659 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 15:01:02,683 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-23 15:01:02,683 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 245 treesize of output 248 [2022-11-23 15:01:02,759 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 [2022-11-23 15:01:02,801 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:01:03,065 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6119#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-23 15:01:03,065 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:01:03,065 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:01:03,066 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 31 [2022-11-23 15:01:03,066 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [296719501] [2022-11-23 15:01:03,066 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:01:03,066 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-11-23 15:01:03,066 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:01:03,067 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-11-23 15:01:03,067 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=265, Invalid=995, Unknown=0, NotChecked=0, Total=1260 [2022-11-23 15:01:03,067 INFO L87 Difference]: Start difference. First operand 34 states and 37 transitions. Second operand has 31 states, 31 states have (on average 1.2580645161290323) internal successors, (39), 31 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) [2022-11-23 15:01:03,370 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:01:03,370 INFO L93 Difference]: Finished difference Result 69 states and 75 transitions. [2022-11-23 15:01:03,371 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-11-23 15:01:03,371 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.2580645161290323) internal successors, (39), 31 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 32 [2022-11-23 15:01:03,371 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:01:03,372 INFO L225 Difference]: With dead ends: 69 [2022-11-23 15:01:03,372 INFO L226 Difference]: Without dead ends: 38 [2022-11-23 15:01:03,372 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 63 SyntacticMatches, 17 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 796 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=418, Invalid=1562, Unknown=0, NotChecked=0, Total=1980 [2022-11-23 15:01:03,374 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 23 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 141 mSolverCounterSat, 113 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 254 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 113 IncrementalHoareTripleChecker+Valid, 141 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 15:01:03,374 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [23 Valid, 19 Invalid, 254 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [113 Valid, 141 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 15:01:03,374 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2022-11-23 15:01:03,408 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 34. [2022-11-23 15:01:03,408 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 33 states have (on average 1.0909090909090908) internal successors, (36), 33 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) [2022-11-23 15:01:03,408 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 36 transitions. [2022-11-23 15:01:03,408 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 36 transitions. Word has length 32 [2022-11-23 15:01:03,408 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:01:03,409 INFO L495 AbstractCegarLoop]: Abstraction has 34 states and 36 transitions. [2022-11-23 15:01:03,409 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 1.2580645161290323) internal successors, (39), 31 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) [2022-11-23 15:01:03,409 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 36 transitions. [2022-11-23 15:01:03,409 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-11-23 15:01:03,409 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:01:03,409 INFO L195 NwaCegarLoop]: trace histogram [9, 9, 8, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:01:03,414 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2022-11-23 15:01:03,610 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:01:03,610 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:01:03,610 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:01:03,610 INFO L85 PathProgramCache]: Analyzing trace with hash -16518468, now seen corresponding path program 23 times [2022-11-23 15:01:03,610 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:01:03,611 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [204770407] [2022-11-23 15:01:03,611 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:01:03,611 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:01:03,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:01:03,910 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 28 proven. 53 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2022-11-23 15:01:03,911 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:01:03,911 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [204770407] [2022-11-23 15:01:03,911 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [204770407] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:01:03,911 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [334039832] [2022-11-23 15:01:03,911 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 15:01:03,912 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:01:03,912 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:01:03,912 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:01:03,915 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-11-23 15:01:04,041 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-11-23 15:01:04,041 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 15:01:04,043 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-23 15:01:04,044 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:01:04,241 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 36 proven. 45 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2022-11-23 15:01:04,242 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:01:04,435 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 36 proven. 45 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2022-11-23 15:01:04,435 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [334039832] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:01:04,435 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1012247151] [2022-11-23 15:01:04,436 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-23 15:01:04,436 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:01:04,436 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:01:04,437 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:01:04,437 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:01:04,491 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-23 15:01:04,492 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-23 15:01:04,501 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 [2022-11-23 15:01:04,518 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 [2022-11-23 15:01:04,566 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:01:04,567 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 15:01:04,590 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-23 15:01:04,591 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 245 treesize of output 248 [2022-11-23 15:01:04,667 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 [2022-11-23 15:01:04,724 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:01:05,189 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6556#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-23 15:01:05,189 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:01:05,189 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:01:05,189 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 32 [2022-11-23 15:01:05,190 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1386681002] [2022-11-23 15:01:05,190 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:01:05,190 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-11-23 15:01:05,190 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:01:05,191 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-11-23 15:01:05,191 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=265, Invalid=1067, Unknown=0, NotChecked=0, Total=1332 [2022-11-23 15:01:05,195 INFO L87 Difference]: Start difference. First operand 34 states and 36 transitions. Second operand has 32 states, 32 states have (on average 1.53125) internal successors, (49), 32 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) [2022-11-23 15:01:05,509 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:01:05,509 INFO L93 Difference]: Finished difference Result 38 states and 40 transitions. [2022-11-23 15:01:05,510 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-11-23 15:01:05,510 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.53125) internal successors, (49), 32 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) Word has length 33 [2022-11-23 15:01:05,510 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:01:05,510 INFO L225 Difference]: With dead ends: 38 [2022-11-23 15:01:05,510 INFO L226 Difference]: Without dead ends: 35 [2022-11-23 15:01:05,511 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 57 SyntacticMatches, 27 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1380 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=438, Invalid=1818, Unknown=0, NotChecked=0, Total=2256 [2022-11-23 15:01:05,512 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 23 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 225 mSolverCounterSat, 81 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 306 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 81 IncrementalHoareTripleChecker+Valid, 225 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 15:01:05,512 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [23 Valid, 13 Invalid, 306 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [81 Valid, 225 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 15:01:05,513 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2022-11-23 15:01:05,538 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2022-11-23 15:01:05,539 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 34 states have (on average 1.088235294117647) internal successors, (37), 34 states have internal predecessors, (37), 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) [2022-11-23 15:01:05,539 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2022-11-23 15:01:05,539 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 33 [2022-11-23 15:01:05,539 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:01:05,539 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2022-11-23 15:01:05,539 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 1.53125) internal successors, (49), 32 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) [2022-11-23 15:01:05,539 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2022-11-23 15:01:05,540 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-11-23 15:01:05,540 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:01:05,540 INFO L195 NwaCegarLoop]: trace histogram [9, 9, 9, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:01:05,547 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Ended with exit code 0 [2022-11-23 15:01:05,740 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:01:05,740 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:01:05,741 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:01:05,741 INFO L85 PathProgramCache]: Analyzing trace with hash -512228200, now seen corresponding path program 24 times [2022-11-23 15:01:05,741 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:01:05,741 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [872733373] [2022-11-23 15:01:05,741 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:01:05,741 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:01:05,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:01:10,293 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 0 proven. 135 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 15:01:10,293 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:01:10,293 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [872733373] [2022-11-23 15:01:10,293 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [872733373] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:01:10,293 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [732150424] [2022-11-23 15:01:10,294 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 15:01:10,294 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:01:10,294 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:01:10,295 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:01:10,298 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-11-23 15:01:10,420 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 15:01:10,420 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 15:01:10,423 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 84 conjunts are in the unsatisfiable core [2022-11-23 15:01:10,425 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:01:10,502 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 [2022-11-23 15:01:12,453 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2022-11-23 15:01:12,453 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:01:15,678 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2022-11-23 15:01:15,678 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [732150424] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:01:15,678 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2128129811] [2022-11-23 15:01:15,679 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-23 15:01:15,680 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:01:15,680 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:01:15,680 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:01:15,680 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:01:15,732 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-23 15:01:15,732 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-23 15:01:15,741 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 [2022-11-23 15:01:15,779 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 [2022-11-23 15:01:15,819 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:01:15,822 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:01:15,834 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-23 15:01:15,834 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 250 treesize of output 247 [2022-11-23 15:01:15,877 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 [2022-11-23 15:01:15,925 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:01:17,866 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6987#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-23 15:01:17,867 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:01:17,867 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:01:17,867 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 24, 23] total 72 [2022-11-23 15:01:17,867 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1402592031] [2022-11-23 15:01:17,867 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:01:17,868 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 72 states [2022-11-23 15:01:17,868 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:01:17,868 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2022-11-23 15:01:17,869 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=258, Invalid=5594, Unknown=0, NotChecked=0, Total=5852 [2022-11-23 15:01:17,869 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand has 72 states, 72 states have (on average 1.1111111111111112) internal successors, (80), 72 states have internal predecessors, (80), 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) [2022-11-23 15:01:22,670 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:01:22,671 INFO L93 Difference]: Finished difference Result 49 states and 52 transitions. [2022-11-23 15:01:22,671 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-11-23 15:01:22,671 INFO L78 Accepts]: Start accepts. Automaton has has 72 states, 72 states have (on average 1.1111111111111112) internal successors, (80), 72 states have internal predecessors, (80), 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 34 [2022-11-23 15:01:22,672 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:01:22,672 INFO L225 Difference]: With dead ends: 49 [2022-11-23 15:01:22,672 INFO L226 Difference]: Without dead ends: 46 [2022-11-23 15:01:22,673 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 46 SyntacticMatches, 12 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1902 ImplicationChecksByTransitivity, 11.5s TimeCoverageRelationStatistics Valid=408, Invalid=8712, Unknown=0, NotChecked=0, Total=9120 [2022-11-23 15:01:22,674 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 7 mSDsluCounter, 74 mSDsCounter, 0 mSdLazyCounter, 1373 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 77 SdHoareTripleChecker+Invalid, 1382 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 1373 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2022-11-23 15:01:22,674 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 77 Invalid, 1382 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 1373 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2022-11-23 15:01:22,674 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2022-11-23 15:01:22,706 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 37. [2022-11-23 15:01:22,706 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 36 states have (on average 1.1111111111111112) internal successors, (40), 36 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) [2022-11-23 15:01:22,707 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 40 transitions. [2022-11-23 15:01:22,707 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 40 transitions. Word has length 34 [2022-11-23 15:01:22,707 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:01:22,707 INFO L495 AbstractCegarLoop]: Abstraction has 37 states and 40 transitions. [2022-11-23 15:01:22,708 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 72 states, 72 states have (on average 1.1111111111111112) internal successors, (80), 72 states have internal predecessors, (80), 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) [2022-11-23 15:01:22,708 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 40 transitions. [2022-11-23 15:01:22,708 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-11-23 15:01:22,708 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:01:22,708 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:01:22,719 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2022-11-23 15:01:22,915 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2022-11-23 15:01:22,915 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:01:22,915 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:01:22,915 INFO L85 PathProgramCache]: Analyzing trace with hash -791524435, now seen corresponding path program 25 times [2022-11-23 15:01:22,915 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:01:22,916 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1000642519] [2022-11-23 15:01:22,916 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:01:22,916 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:01:22,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:01:23,251 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 46 proven. 54 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2022-11-23 15:01:23,251 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:01:23,252 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1000642519] [2022-11-23 15:01:23,252 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1000642519] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:01:23,252 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1102630149] [2022-11-23 15:01:23,252 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-23 15:01:23,252 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:01:23,252 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:01:23,254 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:01:23,280 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-11-23 15:01:23,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:01:23,368 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 22 conjunts are in the unsatisfiable core [2022-11-23 15:01:23,370 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:01:23,664 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 55 proven. 45 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2022-11-23 15:01:23,664 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:01:23,899 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 55 proven. 45 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2022-11-23 15:01:23,899 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1102630149] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:01:23,899 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1693759914] [2022-11-23 15:01:23,900 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-23 15:01:23,900 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:01:23,900 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:01:23,901 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:01:23,901 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:01:23,964 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-23 15:01:23,964 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 26 treesize of output 46 [2022-11-23 15:01:24,015 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-23 15:01:24,015 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-23 15:01:24,033 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 [2022-11-23 15:01:24,071 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:01:24,074 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:01:24,086 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-23 15:01:24,086 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 250 treesize of output 247 [2022-11-23 15:01:24,130 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 [2022-11-23 15:01:24,183 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:01:24,457 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7427#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-23 15:01:24,457 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:01:24,457 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:01:24,457 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 34 [2022-11-23 15:01:24,457 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [256261945] [2022-11-23 15:01:24,458 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:01:24,458 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2022-11-23 15:01:24,458 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:01:24,459 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2022-11-23 15:01:24,459 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=312, Invalid=1170, Unknown=0, NotChecked=0, Total=1482 [2022-11-23 15:01:24,459 INFO L87 Difference]: Start difference. First operand 37 states and 40 transitions. Second operand has 34 states, 34 states have (on average 1.2352941176470589) internal successors, (42), 34 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) [2022-11-23 15:01:24,831 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:01:24,831 INFO L93 Difference]: Finished difference Result 75 states and 81 transitions. [2022-11-23 15:01:24,831 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-11-23 15:01:24,832 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 1.2352941176470589) internal successors, (42), 34 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 35 [2022-11-23 15:01:24,832 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:01:24,832 INFO L225 Difference]: With dead ends: 75 [2022-11-23 15:01:24,832 INFO L226 Difference]: Without dead ends: 41 [2022-11-23 15:01:24,833 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 69 SyntacticMatches, 19 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 950 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=497, Invalid=1855, Unknown=0, NotChecked=0, Total=2352 [2022-11-23 15:01:24,834 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 11 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 177 mSolverCounterSat, 130 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 307 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 130 IncrementalHoareTripleChecker+Valid, 177 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-23 15:01:24,834 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 15 Invalid, 307 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [130 Valid, 177 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-23 15:01:24,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2022-11-23 15:01:24,864 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 37. [2022-11-23 15:01:24,864 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 36 states have (on average 1.0833333333333333) internal successors, (39), 36 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:01:24,864 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 39 transitions. [2022-11-23 15:01:24,864 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 39 transitions. Word has length 35 [2022-11-23 15:01:24,864 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:01:24,864 INFO L495 AbstractCegarLoop]: Abstraction has 37 states and 39 transitions. [2022-11-23 15:01:24,865 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 1.2352941176470589) internal successors, (42), 34 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) [2022-11-23 15:01:24,865 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 39 transitions. [2022-11-23 15:01:24,865 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-11-23 15:01:24,865 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:01:24,865 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 9, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:01:24,871 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2022-11-23 15:01:25,070 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2022-11-23 15:01:25,071 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:01:25,071 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:01:25,071 INFO L85 PathProgramCache]: Analyzing trace with hash -1616452723, now seen corresponding path program 26 times [2022-11-23 15:01:25,071 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:01:25,071 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [574091149] [2022-11-23 15:01:25,071 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:01:25,071 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:01:25,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:01:25,409 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 36 proven. 64 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-11-23 15:01:25,409 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:01:25,409 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [574091149] [2022-11-23 15:01:25,409 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [574091149] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:01:25,409 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [326059650] [2022-11-23 15:01:25,409 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 15:01:25,410 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:01:25,410 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:01:25,411 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:01:25,413 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2022-11-23 15:01:25,560 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-11-23 15:01:25,561 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 15:01:25,563 INFO L263 TraceCheckSpWp]: Trace formula consists of 226 conjuncts, 22 conjunts are in the unsatisfiable core [2022-11-23 15:01:25,564 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:01:25,780 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 45 proven. 55 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-11-23 15:01:25,780 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:01:26,008 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 45 proven. 55 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-11-23 15:01:26,009 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [326059650] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:01:26,009 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1413838931] [2022-11-23 15:01:26,010 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-23 15:01:26,010 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:01:26,010 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:01:26,011 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:01:26,011 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:01:26,063 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-23 15:01:26,064 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-23 15:01:26,074 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 [2022-11-23 15:01:26,091 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 [2022-11-23 15:01:26,131 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:01:26,132 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 15:01:26,155 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-23 15:01:26,156 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 245 treesize of output 248 [2022-11-23 15:01:26,228 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 [2022-11-23 15:01:26,271 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:01:26,504 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7905#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-23 15:01:26,504 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:01:26,504 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:01:26,505 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 35 [2022-11-23 15:01:26,505 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1804716832] [2022-11-23 15:01:26,505 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:01:26,505 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-11-23 15:01:26,505 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:01:26,506 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-11-23 15:01:26,506 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=311, Invalid=1249, Unknown=0, NotChecked=0, Total=1560 [2022-11-23 15:01:26,506 INFO L87 Difference]: Start difference. First operand 37 states and 39 transitions. Second operand has 35 states, 35 states have (on average 1.5142857142857142) internal successors, (53), 35 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) [2022-11-23 15:01:26,861 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:01:26,861 INFO L93 Difference]: Finished difference Result 41 states and 43 transitions. [2022-11-23 15:01:26,862 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-11-23 15:01:26,862 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.5142857142857142) internal successors, (53), 35 states have internal predecessors, (53), 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 36 [2022-11-23 15:01:26,862 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:01:26,862 INFO L225 Difference]: With dead ends: 41 [2022-11-23 15:01:26,862 INFO L226 Difference]: Without dead ends: 38 [2022-11-23 15:01:26,863 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 72 SyntacticMatches, 20 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1244 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=517, Invalid=2135, Unknown=0, NotChecked=0, Total=2652 [2022-11-23 15:01:26,864 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 26 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 257 mSolverCounterSat, 82 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 339 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 82 IncrementalHoareTripleChecker+Valid, 257 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-23 15:01:26,864 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 13 Invalid, 339 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [82 Valid, 257 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-23 15:01:26,864 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2022-11-23 15:01:26,906 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2022-11-23 15:01:26,906 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 37 states have (on average 1.0810810810810811) internal successors, (40), 37 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) [2022-11-23 15:01:26,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2022-11-23 15:01:26,907 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 36 [2022-11-23 15:01:26,907 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:01:26,907 INFO L495 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2022-11-23 15:01:26,907 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.5142857142857142) internal successors, (53), 35 states have internal predecessors, (53), 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) [2022-11-23 15:01:26,907 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2022-11-23 15:01:26,908 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-11-23 15:01:26,908 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:01:26,908 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 10, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:01:26,914 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2022-11-23 15:01:27,111 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2022-11-23 15:01:27,111 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:01:27,111 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:01:27,111 INFO L85 PathProgramCache]: Analyzing trace with hash 1429417447, now seen corresponding path program 27 times [2022-11-23 15:01:27,111 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:01:27,112 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [498168569] [2022-11-23 15:01:27,112 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:01:27,112 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:01:27,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:01:32,233 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 21 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 15:01:32,234 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:01:32,234 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [498168569] [2022-11-23 15:01:32,234 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [498168569] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:01:32,234 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [570149588] [2022-11-23 15:01:32,234 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 15:01:32,235 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:01:32,235 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:01:32,236 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:01:32,238 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2022-11-23 15:01:32,369 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 15:01:32,369 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 15:01:32,372 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 90 conjunts are in the unsatisfiable core [2022-11-23 15:01:32,373 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:01:34,604 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-11-23 15:01:34,604 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:01:39,600 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 15:01:39,601 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 20 select indices, 20 select index equivalence classes, 0 disjoint index pairs (out of 190 index pairs), introduced 20 new quantified variables, introduced 190 case distinctions, treesize of input 171 treesize of output 1115 [2022-11-23 15:02:12,959 INFO L321 Elim1Store]: treesize reduction 1050, result has 3.8 percent of original size [2022-11-23 15:02:12,960 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 20 select indices, 20 select index equivalence classes, 0 disjoint index pairs (out of 190 index pairs), introduced 20 new quantified variables, introduced 190 case distinctions, treesize of input 172 treesize of output 66 [2022-11-23 15:02:13,093 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-11-23 15:02:13,094 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [570149588] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:02:13,094 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1714492390] [2022-11-23 15:02:13,097 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-23 15:02:13,097 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:02:13,097 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:02:13,097 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:02:13,098 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:02:13,151 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-23 15:02:13,151 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 26 treesize of output 46 [2022-11-23 15:02:13,202 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-23 15:02:13,202 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-23 15:02:13,229 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 [2022-11-23 15:02:13,267 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:02:13,267 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 15:02:13,290 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-23 15:02:13,291 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 245 treesize of output 248 [2022-11-23 15:02:13,340 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 [2022-11-23 15:02:13,400 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:02:15,375 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8375#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-23 15:02:15,375 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:02:15,375 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:02:15,376 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 26, 25] total 79 [2022-11-23 15:02:15,376 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1011346148] [2022-11-23 15:02:15,376 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:02:15,376 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 79 states [2022-11-23 15:02:15,376 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:02:15,377 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2022-11-23 15:02:15,377 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=337, Invalid=6635, Unknown=0, NotChecked=0, Total=6972 [2022-11-23 15:02:15,378 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand has 79 states, 79 states have (on average 1.1012658227848102) internal successors, (87), 79 states have internal predecessors, (87), 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) [2022-11-23 15:02:21,667 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:02:21,668 INFO L93 Difference]: Finished difference Result 57 states and 60 transitions. [2022-11-23 15:02:21,668 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-11-23 15:02:21,668 INFO L78 Accepts]: Start accepts. Automaton has has 79 states, 79 states have (on average 1.1012658227848102) internal successors, (87), 79 states have internal predecessors, (87), 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 37 [2022-11-23 15:02:21,668 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:02:21,669 INFO L225 Difference]: With dead ends: 57 [2022-11-23 15:02:21,669 INFO L226 Difference]: Without dead ends: 54 [2022-11-23 15:02:21,670 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 50 SyntacticMatches, 13 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3659 ImplicationChecksByTransitivity, 13.2s TimeCoverageRelationStatistics Valid=659, Invalid=11773, Unknown=0, NotChecked=0, Total=12432 [2022-11-23 15:02:21,670 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 26 mSDsluCounter, 163 mSDsCounter, 0 mSdLazyCounter, 1588 mSolverCounterSat, 67 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 168 SdHoareTripleChecker+Invalid, 1655 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 67 IncrementalHoareTripleChecker+Valid, 1588 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2022-11-23 15:02:21,671 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 168 Invalid, 1655 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [67 Valid, 1588 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2022-11-23 15:02:21,671 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2022-11-23 15:02:21,727 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 40. [2022-11-23 15:02:21,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 39 states have (on average 1.1025641025641026) internal successors, (43), 39 states have internal predecessors, (43), 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) [2022-11-23 15:02:21,727 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 43 transitions. [2022-11-23 15:02:21,728 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 43 transitions. Word has length 37 [2022-11-23 15:02:21,728 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:02:21,728 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 43 transitions. [2022-11-23 15:02:21,728 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 79 states, 79 states have (on average 1.1012658227848102) internal successors, (87), 79 states have internal predecessors, (87), 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) [2022-11-23 15:02:21,728 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 43 transitions. [2022-11-23 15:02:21,728 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-11-23 15:02:21,728 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:02:21,729 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:02:21,733 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2022-11-23 15:02:21,929 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2022-11-23 15:02:21,929 INFO L420 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:02:21,930 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:02:21,930 INFO L85 PathProgramCache]: Analyzing trace with hash 929546108, now seen corresponding path program 28 times [2022-11-23 15:02:21,930 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:02:21,930 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [722332185] [2022-11-23 15:02:21,930 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:02:21,930 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:02:21,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:02:22,242 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 56 proven. 65 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-11-23 15:02:22,242 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:02:22,242 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [722332185] [2022-11-23 15:02:22,242 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [722332185] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:02:22,242 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [764350987] [2022-11-23 15:02:22,242 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-23 15:02:22,243 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:02:22,243 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:02:22,244 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:02:22,246 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2022-11-23 15:02:22,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:02:22,357 INFO L263 TraceCheckSpWp]: Trace formula consists of 236 conjuncts, 24 conjunts are in the unsatisfiable core [2022-11-23 15:02:22,358 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:02:22,687 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 66 proven. 55 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-11-23 15:02:22,688 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:02:22,963 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 66 proven. 55 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-11-23 15:02:22,963 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [764350987] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:02:22,964 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1958482372] [2022-11-23 15:02:22,965 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-23 15:02:22,965 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:02:22,965 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:02:22,965 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:02:22,965 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:02:23,026 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-23 15:02:23,027 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-23 15:02:23,037 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 [2022-11-23 15:02:23,057 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 [2022-11-23 15:02:23,112 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:02:23,113 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 15:02:23,138 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-23 15:02:23,139 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 245 treesize of output 248 [2022-11-23 15:02:23,219 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 [2022-11-23 15:02:23,281 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:02:23,940 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8873#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-23 15:02:23,940 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:02:23,940 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:02:23,940 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 37 [2022-11-23 15:02:23,941 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [970875616] [2022-11-23 15:02:23,941 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:02:23,941 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2022-11-23 15:02:23,941 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:02:23,941 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2022-11-23 15:02:23,942 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=363, Invalid=1359, Unknown=0, NotChecked=0, Total=1722 [2022-11-23 15:02:23,942 INFO L87 Difference]: Start difference. First operand 40 states and 43 transitions. Second operand has 37 states, 37 states have (on average 1.2162162162162162) internal successors, (45), 37 states have internal predecessors, (45), 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) [2022-11-23 15:02:24,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:02:24,395 INFO L93 Difference]: Finished difference Result 81 states and 87 transitions. [2022-11-23 15:02:24,395 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-11-23 15:02:24,395 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 1.2162162162162162) internal successors, (45), 37 states have internal predecessors, (45), 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 38 [2022-11-23 15:02:24,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:02:24,396 INFO L225 Difference]: With dead ends: 81 [2022-11-23 15:02:24,396 INFO L226 Difference]: Without dead ends: 44 [2022-11-23 15:02:24,396 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 64 SyntacticMatches, 32 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1502 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=583, Invalid=2173, Unknown=0, NotChecked=0, Total=2756 [2022-11-23 15:02:24,397 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 11 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 193 mSolverCounterSat, 161 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 354 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 161 IncrementalHoareTripleChecker+Valid, 193 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-23 15:02:24,397 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 17 Invalid, 354 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [161 Valid, 193 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-23 15:02:24,398 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-11-23 15:02:24,440 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 40. [2022-11-23 15:02:24,440 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 39 states have (on average 1.0769230769230769) internal successors, (42), 39 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) [2022-11-23 15:02:24,440 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions. [2022-11-23 15:02:24,440 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 38 [2022-11-23 15:02:24,440 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:02:24,440 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 42 transitions. [2022-11-23 15:02:24,441 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 1.2162162162162162) internal successors, (45), 37 states have internal predecessors, (45), 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) [2022-11-23 15:02:24,441 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions. [2022-11-23 15:02:24,441 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-11-23 15:02:24,441 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:02:24,441 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 10, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:02:24,446 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2022-11-23 15:02:24,641 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:02:24,642 INFO L420 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:02:24,642 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:02:24,642 INFO L85 PathProgramCache]: Analyzing trace with hash 1293786012, now seen corresponding path program 29 times [2022-11-23 15:02:24,642 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:02:24,642 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [527133115] [2022-11-23 15:02:24,642 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:02:24,643 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:02:24,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:02:25,028 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 45 proven. 76 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2022-11-23 15:02:25,028 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:02:25,028 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [527133115] [2022-11-23 15:02:25,028 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [527133115] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:02:25,029 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [230472510] [2022-11-23 15:02:25,029 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 15:02:25,029 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:02:25,029 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:02:25,030 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:02:25,032 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2022-11-23 15:02:25,226 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2022-11-23 15:02:25,226 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 15:02:25,228 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 24 conjunts are in the unsatisfiable core [2022-11-23 15:02:25,229 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:02:25,482 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 55 proven. 66 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2022-11-23 15:02:25,482 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:02:25,741 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 55 proven. 66 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2022-11-23 15:02:25,741 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [230472510] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:02:25,742 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [495553725] [2022-11-23 15:02:25,743 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-23 15:02:25,743 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:02:25,743 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:02:25,743 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:02:25,744 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:02:25,800 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-23 15:02:25,800 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 26 treesize of output 46 [2022-11-23 15:02:25,851 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-23 15:02:25,851 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-23 15:02:25,877 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 [2022-11-23 15:02:25,941 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:02:25,942 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 15:02:25,966 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-23 15:02:25,966 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 245 treesize of output 248 [2022-11-23 15:02:26,046 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 [2022-11-23 15:02:26,099 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:02:26,683 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9392#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-23 15:02:26,684 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:02:26,684 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:02:26,684 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 38 [2022-11-23 15:02:26,684 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1764966442] [2022-11-23 15:02:26,684 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:02:26,684 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-11-23 15:02:26,684 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:02:26,685 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-11-23 15:02:26,685 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=361, Invalid=1445, Unknown=0, NotChecked=0, Total=1806 [2022-11-23 15:02:26,685 INFO L87 Difference]: Start difference. First operand 40 states and 42 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) [2022-11-23 15:02:27,132 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:02:27,132 INFO L93 Difference]: Finished difference Result 44 states and 46 transitions. [2022-11-23 15:02:27,132 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-11-23 15:02:27,133 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 39 [2022-11-23 15:02:27,133 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:02:27,133 INFO L225 Difference]: With dead ends: 44 [2022-11-23 15:02:27,133 INFO L226 Difference]: Without dead ends: 41 [2022-11-23 15:02:27,134 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 67 SyntacticMatches, 33 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1974 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=603, Invalid=2477, Unknown=0, NotChecked=0, Total=3080 [2022-11-23 15:02:27,134 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 24 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 383 mSolverCounterSat, 78 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 461 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 78 IncrementalHoareTripleChecker+Valid, 383 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-23 15:02:27,134 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [24 Valid, 21 Invalid, 461 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [78 Valid, 383 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-23 15:02:27,135 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2022-11-23 15:02:27,174 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2022-11-23 15:02:27,174 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 40 states have (on average 1.075) internal successors, (43), 40 states have internal predecessors, (43), 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) [2022-11-23 15:02:27,174 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 43 transitions. [2022-11-23 15:02:27,174 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 43 transitions. Word has length 39 [2022-11-23 15:02:27,174 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:02:27,175 INFO L495 AbstractCegarLoop]: Abstraction has 41 states and 43 transitions. [2022-11-23 15:02:27,175 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) [2022-11-23 15:02:27,175 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 43 transitions. [2022-11-23 15:02:27,175 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-11-23 15:02:27,175 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:02:27,175 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 11, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:02:27,183 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2022-11-23 15:02:27,379 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:02:27,379 INFO L420 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:02:27,379 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:02:27,379 INFO L85 PathProgramCache]: Analyzing trace with hash 1452505016, now seen corresponding path program 30 times [2022-11-23 15:02:27,379 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:02:27,380 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [243800641] [2022-11-23 15:02:27,380 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:02:27,380 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:02:27,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:02:33,173 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 15 proven. 183 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 15:02:33,173 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:02:33,174 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [243800641] [2022-11-23 15:02:33,174 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [243800641] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:02:33,174 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2099282567] [2022-11-23 15:02:33,174 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 15:02:33,174 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:02:33,174 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:02:33,175 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:02:33,178 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2022-11-23 15:02:33,326 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 15:02:33,326 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 15:02:33,329 INFO L263 TraceCheckSpWp]: Trace formula consists of 248 conjuncts, 98 conjunts are in the unsatisfiable core [2022-11-23 15:02:33,331 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:02:36,132 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2022-11-23 15:02:36,132 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:02:42,943 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 15:02:42,944 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 22 select indices, 22 select index equivalence classes, 0 disjoint index pairs (out of 231 index pairs), introduced 22 new quantified variables, introduced 231 case distinctions, treesize of input 188 treesize of output 1347 [2022-11-23 15:03:40,616 INFO L321 Elim1Store]: treesize reduction 1276, result has 3.4 percent of original size [2022-11-23 15:03:40,617 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 22 select indices, 22 select index equivalence classes, 0 disjoint index pairs (out of 231 index pairs), introduced 22 new quantified variables, introduced 231 case distinctions, treesize of input 189 treesize of output 72 [2022-11-23 15:03:40,771 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2022-11-23 15:03:40,771 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2099282567] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:03:40,772 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1885229842] [2022-11-23 15:03:40,773 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-23 15:03:40,773 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:03:40,773 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:03:40,773 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:03:40,773 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:03:40,821 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-23 15:03:40,821 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 26 treesize of output 46 [2022-11-23 15:03:40,872 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-23 15:03:40,873 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-23 15:03:40,894 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 [2022-11-23 15:03:40,941 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:03:40,942 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 15:03:40,965 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-23 15:03:40,966 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 245 treesize of output 248 [2022-11-23 15:03:41,041 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 [2022-11-23 15:03:41,097 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:03:41,917 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9901#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-23 15:03:41,917 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:03:41,917 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:03:41,917 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 28, 27] total 86 [2022-11-23 15:03:41,917 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [351628990] [2022-11-23 15:03:41,918 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:03:41,918 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 86 states [2022-11-23 15:03:41,918 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:03:41,919 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2022-11-23 15:03:41,919 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=351, Invalid=7839, Unknown=0, NotChecked=0, Total=8190 [2022-11-23 15:03:41,919 INFO L87 Difference]: Start difference. First operand 41 states and 43 transitions. Second operand has 86 states, 86 states have (on average 1.0930232558139534) internal successors, (94), 86 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) [2022-11-23 15:03:49,542 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:03:49,543 INFO L93 Difference]: Finished difference Result 61 states and 64 transitions. [2022-11-23 15:03:49,543 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2022-11-23 15:03:49,543 INFO L78 Accepts]: Start accepts. Automaton has has 86 states, 86 states have (on average 1.0930232558139534) internal successors, (94), 86 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) Word has length 40 [2022-11-23 15:03:49,543 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:03:49,544 INFO L225 Difference]: With dead ends: 61 [2022-11-23 15:03:49,544 INFO L226 Difference]: Without dead ends: 58 [2022-11-23 15:03:49,545 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 186 GetRequests, 66 SyntacticMatches, 2 SemanticMatches, 118 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3160 ImplicationChecksByTransitivity, 14.5s TimeCoverageRelationStatistics Valid=660, Invalid=13620, Unknown=0, NotChecked=0, Total=14280 [2022-11-23 15:03:49,546 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 11 mSDsluCounter, 201 mSDsCounter, 0 mSdLazyCounter, 2146 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 206 SdHoareTripleChecker+Invalid, 2174 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 2146 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2022-11-23 15:03:49,546 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 206 Invalid, 2174 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 2146 Invalid, 0 Unknown, 0 Unchecked, 2.5s Time] [2022-11-23 15:03:49,546 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2022-11-23 15:03:49,586 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 43. [2022-11-23 15:03:49,587 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 42 states have (on average 1.0952380952380953) internal successors, (46), 42 states have internal predecessors, (46), 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) [2022-11-23 15:03:49,587 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 46 transitions. [2022-11-23 15:03:49,587 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 46 transitions. Word has length 40 [2022-11-23 15:03:49,587 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:03:49,587 INFO L495 AbstractCegarLoop]: Abstraction has 43 states and 46 transitions. [2022-11-23 15:03:49,588 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 86 states, 86 states have (on average 1.0930232558139534) internal successors, (94), 86 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) [2022-11-23 15:03:49,588 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 46 transitions. [2022-11-23 15:03:49,588 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-11-23 15:03:49,588 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:03:49,588 INFO L195 NwaCegarLoop]: trace histogram [12, 11, 11, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:03:49,593 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2022-11-23 15:03:49,789 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:03:49,789 INFO L420 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:03:49,789 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:03:49,789 INFO L85 PathProgramCache]: Analyzing trace with hash 1553179725, now seen corresponding path program 31 times [2022-11-23 15:03:49,789 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:03:49,790 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1345733311] [2022-11-23 15:03:49,790 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:03:49,790 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:03:49,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:03:50,220 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 67 proven. 77 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2022-11-23 15:03:50,220 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:03:50,220 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1345733311] [2022-11-23 15:03:50,220 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1345733311] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:03:50,220 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1114587097] [2022-11-23 15:03:50,220 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-23 15:03:50,220 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:03:50,221 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:03:50,223 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:03:50,227 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2022-11-23 15:03:50,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:03:50,358 INFO L263 TraceCheckSpWp]: Trace formula consists of 253 conjuncts, 26 conjunts are in the unsatisfiable core [2022-11-23 15:03:50,359 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:03:50,766 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 78 proven. 66 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2022-11-23 15:03:50,766 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:03:51,040 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 78 proven. 66 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2022-11-23 15:03:51,040 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1114587097] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:03:51,040 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [832609456] [2022-11-23 15:03:51,041 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-23 15:03:51,041 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:03:51,042 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:03:51,042 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:03:51,042 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:03:51,096 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-23 15:03:51,096 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 26 treesize of output 46 [2022-11-23 15:03:51,147 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-23 15:03:51,147 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-23 15:03:51,169 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 [2022-11-23 15:03:51,216 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:03:51,217 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 15:03:51,240 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-23 15:03:51,241 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 245 treesize of output 248 [2022-11-23 15:03:51,292 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 [2022-11-23 15:03:51,344 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:03:52,070 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10436#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-23 15:03:52,070 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:03:52,070 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:03:52,071 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 40 [2022-11-23 15:03:52,071 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [638682489] [2022-11-23 15:03:52,071 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:03:52,071 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-11-23 15:03:52,071 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:03:52,072 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-11-23 15:03:52,072 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=418, Invalid=1562, Unknown=0, NotChecked=0, Total=1980 [2022-11-23 15:03:52,073 INFO L87 Difference]: Start difference. First operand 43 states and 46 transitions. Second operand has 40 states, 40 states have (on average 1.2) internal successors, (48), 40 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) [2022-11-23 15:03:52,610 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:03:52,610 INFO L93 Difference]: Finished difference Result 87 states and 93 transitions. [2022-11-23 15:03:52,610 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-11-23 15:03:52,611 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.2) internal successors, (48), 40 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 41 [2022-11-23 15:03:52,611 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:03:52,611 INFO L225 Difference]: With dead ends: 87 [2022-11-23 15:03:52,611 INFO L226 Difference]: Without dead ends: 47 [2022-11-23 15:03:52,612 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 69 SyntacticMatches, 35 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1753 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=676, Invalid=2516, Unknown=0, NotChecked=0, Total=3192 [2022-11-23 15:03:52,612 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 11 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 204 mSolverCounterSat, 194 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 398 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 194 IncrementalHoareTripleChecker+Valid, 204 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-23 15:03:52,612 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 17 Invalid, 398 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [194 Valid, 204 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-23 15:03:52,613 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2022-11-23 15:03:52,651 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 43. [2022-11-23 15:03:52,652 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 42 states have (on average 1.0714285714285714) internal successors, (45), 42 states have internal predecessors, (45), 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) [2022-11-23 15:03:52,652 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 45 transitions. [2022-11-23 15:03:52,652 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 45 transitions. Word has length 41 [2022-11-23 15:03:52,652 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:03:52,652 INFO L495 AbstractCegarLoop]: Abstraction has 43 states and 45 transitions. [2022-11-23 15:03:52,652 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 1.2) internal successors, (48), 40 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) [2022-11-23 15:03:52,652 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 45 transitions. [2022-11-23 15:03:52,653 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2022-11-23 15:03:52,653 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:03:52,653 INFO L195 NwaCegarLoop]: trace histogram [12, 12, 11, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:03:52,659 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2022-11-23 15:03:52,853 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2022-11-23 15:03:52,853 INFO L420 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:03:52,854 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:03:52,854 INFO L85 PathProgramCache]: Analyzing trace with hash -758197203, now seen corresponding path program 32 times [2022-11-23 15:03:52,854 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:03:52,854 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2044534578] [2022-11-23 15:03:52,854 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:03:52,854 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:03:52,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:03:53,306 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 55 proven. 89 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2022-11-23 15:03:53,306 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:03:53,306 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2044534578] [2022-11-23 15:03:53,306 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2044534578] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:03:53,307 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2039041199] [2022-11-23 15:03:53,307 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 15:03:53,307 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:03:53,307 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:03:53,309 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:03:53,310 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2022-11-23 15:03:53,543 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2022-11-23 15:03:53,543 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 15:03:53,545 INFO L263 TraceCheckSpWp]: Trace formula consists of 260 conjuncts, 26 conjunts are in the unsatisfiable core [2022-11-23 15:03:53,546 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:03:53,831 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 66 proven. 78 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2022-11-23 15:03:53,832 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:03:54,136 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 66 proven. 78 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2022-11-23 15:03:54,136 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2039041199] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:03:54,136 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1955252667] [2022-11-23 15:03:54,137 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-23 15:03:54,137 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:03:54,138 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:03:54,138 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:03:54,138 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:03:54,195 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-23 15:03:54,195 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 26 treesize of output 46 [2022-11-23 15:03:54,247 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-23 15:03:54,248 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-23 15:03:54,266 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 [2022-11-23 15:03:54,321 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:03:54,323 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:03:54,339 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-23 15:03:54,340 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 250 treesize of output 247 [2022-11-23 15:03:54,384 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 [2022-11-23 15:03:54,431 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:03:54,715 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10996#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-23 15:03:54,715 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:03:54,715 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:03:54,715 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 41 [2022-11-23 15:03:54,715 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1575571199] [2022-11-23 15:03:54,716 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:03:54,716 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2022-11-23 15:03:54,716 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:03:54,717 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2022-11-23 15:03:54,717 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=415, Invalid=1655, Unknown=0, NotChecked=0, Total=2070 [2022-11-23 15:03:54,717 INFO L87 Difference]: Start difference. First operand 43 states and 45 transitions. Second operand has 41 states, 41 states have (on average 1.4878048780487805) internal successors, (61), 41 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:03:55,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:03:55,226 INFO L93 Difference]: Finished difference Result 47 states and 49 transitions. [2022-11-23 15:03:55,227 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-11-23 15:03:55,227 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.4878048780487805) internal successors, (61), 41 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 42 [2022-11-23 15:03:55,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:03:55,228 INFO L225 Difference]: With dead ends: 47 [2022-11-23 15:03:55,228 INFO L226 Difference]: Without dead ends: 44 [2022-11-23 15:03:55,228 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 84 SyntacticMatches, 24 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1710 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=696, Invalid=2844, Unknown=0, NotChecked=0, Total=3540 [2022-11-23 15:03:55,228 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 25 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 316 mSolverCounterSat, 115 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 431 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 115 IncrementalHoareTripleChecker+Valid, 316 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-23 15:03:55,229 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [25 Valid, 13 Invalid, 431 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [115 Valid, 316 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-23 15:03:55,229 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-11-23 15:03:55,265 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2022-11-23 15:03:55,266 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 43 states have (on average 1.069767441860465) internal successors, (46), 43 states have internal predecessors, (46), 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) [2022-11-23 15:03:55,266 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2022-11-23 15:03:55,266 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 42 [2022-11-23 15:03:55,266 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:03:55,266 INFO L495 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2022-11-23 15:03:55,266 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 1.4878048780487805) internal successors, (61), 41 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:03:55,266 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2022-11-23 15:03:55,267 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-11-23 15:03:55,267 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:03:55,267 INFO L195 NwaCegarLoop]: trace histogram [12, 12, 12, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:03:55,272 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2022-11-23 15:03:55,467 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2022-11-23 15:03:55,467 INFO L420 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:03:55,468 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:03:55,468 INFO L85 PathProgramCache]: Analyzing trace with hash -2029432505, now seen corresponding path program 33 times [2022-11-23 15:03:55,468 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:03:55,468 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2035088524] [2022-11-23 15:03:55,468 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:03:55,468 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:03:55,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:04:02,895 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 36 proven. 198 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 15:04:02,895 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:04:02,895 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2035088524] [2022-11-23 15:04:02,895 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2035088524] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:04:02,895 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [874918441] [2022-11-23 15:04:02,895 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 15:04:02,896 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:04:02,896 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:04:02,896 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:04:02,899 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2022-11-23 15:04:03,074 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 15:04:03,074 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 15:04:03,077 INFO L263 TraceCheckSpWp]: Trace formula consists of 265 conjuncts, 110 conjunts are in the unsatisfiable core [2022-11-23 15:04:03,079 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:04:03,178 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 [2022-11-23 15:04:06,484 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2022-11-23 15:04:06,485 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:04:11,801 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2022-11-23 15:04:11,801 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [874918441] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:04:11,801 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1850137266] [2022-11-23 15:04:11,802 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-23 15:04:11,802 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:04:11,803 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:04:11,803 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:04:11,803 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:04:11,868 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-23 15:04:11,869 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-23 15:04:11,882 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 [2022-11-23 15:04:11,901 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 [2022-11-23 15:04:11,946 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:04:11,946 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 15:04:11,973 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-23 15:04:11,974 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 245 treesize of output 248 [2022-11-23 15:04:12,049 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 [2022-11-23 15:04:12,106 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:04:14,871 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11544#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-23 15:04:14,871 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:04:14,872 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:04:14,872 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 30, 29] total 93 [2022-11-23 15:04:14,872 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2047126768] [2022-11-23 15:04:14,872 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:04:14,872 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 93 states [2022-11-23 15:04:14,872 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:04:14,873 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 93 interpolants. [2022-11-23 15:04:14,873 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=439, Invalid=9067, Unknown=0, NotChecked=0, Total=9506 [2022-11-23 15:04:14,874 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand has 93 states, 93 states have (on average 1.086021505376344) internal successors, (101), 93 states have internal predecessors, (101), 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) [2022-11-23 15:04:24,328 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:04:24,328 INFO L93 Difference]: Finished difference Result 65 states and 68 transitions. [2022-11-23 15:04:24,329 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2022-11-23 15:04:24,329 INFO L78 Accepts]: Start accepts. Automaton has has 93 states, 93 states have (on average 1.086021505376344) internal successors, (101), 93 states have internal predecessors, (101), 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 43 [2022-11-23 15:04:24,329 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:04:24,330 INFO L225 Difference]: With dead ends: 65 [2022-11-23 15:04:24,330 INFO L226 Difference]: Without dead ends: 62 [2022-11-23 15:04:24,331 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 202 GetRequests, 58 SyntacticMatches, 15 SemanticMatches, 129 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5099 ImplicationChecksByTransitivity, 19.9s TimeCoverageRelationStatistics Valid=879, Invalid=16151, Unknown=0, NotChecked=0, Total=17030 [2022-11-23 15:04:24,331 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 26 mSDsluCounter, 188 mSDsCounter, 0 mSdLazyCounter, 2162 mSolverCounterSat, 81 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 193 SdHoareTripleChecker+Invalid, 2243 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 81 IncrementalHoareTripleChecker+Valid, 2162 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.9s IncrementalHoareTripleChecker+Time [2022-11-23 15:04:24,331 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 193 Invalid, 2243 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [81 Valid, 2162 Invalid, 0 Unknown, 0 Unchecked, 2.9s Time] [2022-11-23 15:04:24,331 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2022-11-23 15:04:24,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 46. [2022-11-23 15:04:24,379 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 45 states have (on average 1.0888888888888888) internal successors, (49), 45 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) [2022-11-23 15:04:24,380 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 49 transitions. [2022-11-23 15:04:24,380 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 49 transitions. Word has length 43 [2022-11-23 15:04:24,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:04:24,380 INFO L495 AbstractCegarLoop]: Abstraction has 46 states and 49 transitions. [2022-11-23 15:04:24,381 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 93 states, 93 states have (on average 1.086021505376344) internal successors, (101), 93 states have internal predecessors, (101), 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) [2022-11-23 15:04:24,381 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 49 transitions. [2022-11-23 15:04:24,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-11-23 15:04:24,381 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:04:24,382 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:04:24,391 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2022-11-23 15:04:24,588 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34,34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:04:24,588 INFO L420 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:04:24,588 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:04:24,588 INFO L85 PathProgramCache]: Analyzing trace with hash -1867212708, now seen corresponding path program 34 times [2022-11-23 15:04:24,589 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:04:24,589 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [149678747] [2022-11-23 15:04:24,589 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:04:24,589 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:04:24,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:04:25,035 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 79 proven. 90 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2022-11-23 15:04:25,035 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:04:25,035 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [149678747] [2022-11-23 15:04:25,036 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [149678747] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:04:25,036 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [946946734] [2022-11-23 15:04:25,036 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-23 15:04:25,036 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:04:25,036 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:04:25,039 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:04:25,061 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2022-11-23 15:04:25,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:04:25,185 INFO L263 TraceCheckSpWp]: Trace formula consists of 270 conjuncts, 28 conjunts are in the unsatisfiable core [2022-11-23 15:04:25,187 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:04:25,603 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 91 proven. 78 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2022-11-23 15:04:25,603 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:04:25,912 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 91 proven. 78 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2022-11-23 15:04:25,912 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [946946734] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:04:25,912 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [428351487] [2022-11-23 15:04:25,913 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-23 15:04:25,913 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:04:25,914 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:04:25,914 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:04:25,914 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:04:25,962 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-23 15:04:25,962 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 26 treesize of output 46 [2022-11-23 15:04:26,015 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-23 15:04:26,016 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-23 15:04:26,036 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 [2022-11-23 15:04:26,079 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:04:26,081 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:04:26,093 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-23 15:04:26,094 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 250 treesize of output 247 [2022-11-23 15:04:26,139 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 [2022-11-23 15:04:26,202 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:04:27,026 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12122#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-23 15:04:27,026 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:04:27,026 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:04:27,027 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 43 [2022-11-23 15:04:27,027 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1500758468] [2022-11-23 15:04:27,027 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:04:27,027 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2022-11-23 15:04:27,027 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:04:27,027 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2022-11-23 15:04:27,028 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=477, Invalid=1779, Unknown=0, NotChecked=0, Total=2256 [2022-11-23 15:04:27,028 INFO L87 Difference]: Start difference. First operand 46 states and 49 transitions. Second operand has 43 states, 43 states have (on average 1.186046511627907) internal successors, (51), 43 states have internal predecessors, (51), 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) [2022-11-23 15:04:27,565 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:04:27,565 INFO L93 Difference]: Finished difference Result 93 states and 99 transitions. [2022-11-23 15:04:27,565 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-11-23 15:04:27,566 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 1.186046511627907) internal successors, (51), 43 states have internal predecessors, (51), 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 44 [2022-11-23 15:04:27,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:04:27,566 INFO L225 Difference]: With dead ends: 93 [2022-11-23 15:04:27,566 INFO L226 Difference]: Without dead ends: 50 [2022-11-23 15:04:27,567 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 171 GetRequests, 74 SyntacticMatches, 38 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2023 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=776, Invalid=2884, Unknown=0, NotChecked=0, Total=3660 [2022-11-23 15:04:27,568 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 15 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 258 mSolverCounterSat, 155 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 413 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 155 IncrementalHoareTripleChecker+Valid, 258 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-23 15:04:27,568 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 19 Invalid, 413 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [155 Valid, 258 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-23 15:04:27,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2022-11-23 15:04:27,636 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 46. [2022-11-23 15:04:27,636 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 45 states have (on average 1.0666666666666667) internal successors, (48), 45 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) [2022-11-23 15:04:27,636 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 48 transitions. [2022-11-23 15:04:27,637 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 48 transitions. Word has length 44 [2022-11-23 15:04:27,637 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:04:27,637 INFO L495 AbstractCegarLoop]: Abstraction has 46 states and 48 transitions. [2022-11-23 15:04:27,637 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 1.186046511627907) internal successors, (51), 43 states have internal predecessors, (51), 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) [2022-11-23 15:04:27,637 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 48 transitions. [2022-11-23 15:04:27,638 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2022-11-23 15:04:27,638 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:04:27,638 INFO L195 NwaCegarLoop]: trace histogram [13, 13, 12, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:04:27,652 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2022-11-23 15:04:27,845 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35,35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:04:27,845 INFO L420 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:04:27,845 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:04:27,845 INFO L85 PathProgramCache]: Analyzing trace with hash 1113382012, now seen corresponding path program 35 times [2022-11-23 15:04:27,845 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:04:27,845 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1522455087] [2022-11-23 15:04:27,846 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:04:27,846 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:04:27,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:04:28,310 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 66 proven. 103 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2022-11-23 15:04:28,310 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:04:28,310 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1522455087] [2022-11-23 15:04:28,310 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1522455087] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:04:28,310 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1946241954] [2022-11-23 15:04:28,311 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 15:04:28,311 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:04:28,311 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:04:28,312 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:04:28,314 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2022-11-23 15:04:28,592 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2022-11-23 15:04:28,592 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 15:04:28,595 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 28 conjunts are in the unsatisfiable core [2022-11-23 15:04:28,596 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:04:28,939 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 78 proven. 91 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2022-11-23 15:04:28,940 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:04:29,308 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 78 proven. 91 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2022-11-23 15:04:29,308 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1946241954] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:04:29,308 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1292328365] [2022-11-23 15:04:29,309 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-23 15:04:29,309 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:04:29,310 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:04:29,310 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:04:29,310 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:04:29,362 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-23 15:04:29,362 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 26 treesize of output 46 [2022-11-23 15:04:29,417 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-23 15:04:29,418 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-23 15:04:29,440 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 [2022-11-23 15:04:29,481 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:04:29,484 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:04:29,497 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-23 15:04:29,498 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 250 treesize of output 247 [2022-11-23 15:04:29,544 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 [2022-11-23 15:04:29,596 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:04:29,878 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12723#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-23 15:04:29,878 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:04:29,878 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:04:29,878 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 44 [2022-11-23 15:04:29,878 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1278929142] [2022-11-23 15:04:29,878 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:04:29,879 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2022-11-23 15:04:29,879 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:04:29,880 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2022-11-23 15:04:29,880 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=473, Invalid=1879, Unknown=0, NotChecked=0, Total=2352 [2022-11-23 15:04:29,880 INFO L87 Difference]: Start difference. First operand 46 states and 48 transitions. Second operand has 44 states, 44 states have (on average 1.4772727272727273) internal successors, (65), 44 states have internal predecessors, (65), 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) [2022-11-23 15:04:30,370 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:04:30,371 INFO L93 Difference]: Finished difference Result 50 states and 52 transitions. [2022-11-23 15:04:30,371 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-11-23 15:04:30,371 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 1.4772727272727273) internal successors, (65), 44 states have internal predecessors, (65), 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 45 [2022-11-23 15:04:30,371 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:04:30,372 INFO L225 Difference]: With dead ends: 50 [2022-11-23 15:04:30,372 INFO L226 Difference]: Without dead ends: 47 [2022-11-23 15:04:30,372 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 90 SyntacticMatches, 26 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1970 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=796, Invalid=3236, Unknown=0, NotChecked=0, Total=4032 [2022-11-23 15:04:30,373 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 32 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 305 mSolverCounterSat, 114 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 419 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 114 IncrementalHoareTripleChecker+Valid, 305 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-23 15:04:30,373 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [32 Valid, 11 Invalid, 419 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [114 Valid, 305 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-23 15:04:30,373 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2022-11-23 15:04:30,419 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2022-11-23 15:04:30,419 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 46 states have (on average 1.065217391304348) internal successors, (49), 46 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) [2022-11-23 15:04:30,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 49 transitions. [2022-11-23 15:04:30,420 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 49 transitions. Word has length 45 [2022-11-23 15:04:30,420 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:04:30,420 INFO L495 AbstractCegarLoop]: Abstraction has 47 states and 49 transitions. [2022-11-23 15:04:30,420 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 1.4772727272727273) internal successors, (65), 44 states have internal predecessors, (65), 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) [2022-11-23 15:04:30,420 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 49 transitions. [2022-11-23 15:04:30,420 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-11-23 15:04:30,420 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:04:30,420 INFO L195 NwaCegarLoop]: trace histogram [13, 13, 13, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:04:30,427 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Ended with exit code 0 [2022-11-23 15:04:30,621 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2022-11-23 15:04:30,621 INFO L420 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:04:30,621 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:04:30,621 INFO L85 PathProgramCache]: Analyzing trace with hash 154948312, now seen corresponding path program 36 times [2022-11-23 15:04:30,621 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:04:30,622 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [450910492] [2022-11-23 15:04:30,622 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:04:30,622 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:04:30,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:04:39,748 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 45 proven. 228 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 15:04:39,748 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:04:39,748 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [450910492] [2022-11-23 15:04:39,748 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [450910492] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:04:39,748 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [453358268] [2022-11-23 15:04:39,748 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 15:04:39,749 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:04:39,749 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:04:39,751 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:04:39,759 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2022-11-23 15:04:39,950 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 15:04:39,950 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 15:04:39,954 INFO L263 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 116 conjunts are in the unsatisfiable core [2022-11-23 15:04:39,956 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:04:40,058 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 [2022-11-23 15:04:43,652 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2022-11-23 15:04:43,652 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:04:49,043 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2022-11-23 15:04:49,043 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [453358268] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:04:49,043 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [451588862] [2022-11-23 15:04:49,044 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-23 15:04:49,044 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:04:49,045 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:04:49,045 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:04:49,045 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:04:49,098 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-23 15:04:49,099 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-23 15:04:49,109 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 [2022-11-23 15:04:49,126 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 [2022-11-23 15:04:49,168 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:04:49,169 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 15:04:49,193 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-23 15:04:49,193 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 245 treesize of output 248 [2022-11-23 15:04:49,243 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 [2022-11-23 15:04:49,296 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:04:51,988 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13310#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-23 15:04:51,988 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:04:51,988 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:04:51,988 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 32, 31] total 100 [2022-11-23 15:04:51,988 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [316736825] [2022-11-23 15:04:51,988 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:04:51,989 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 100 states [2022-11-23 15:04:51,989 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:04:51,990 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 100 interpolants. [2022-11-23 15:04:51,990 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=541, Invalid=10379, Unknown=0, NotChecked=0, Total=10920 [2022-11-23 15:04:51,990 INFO L87 Difference]: Start difference. First operand 47 states and 49 transitions. Second operand has 100 states, 100 states have (on average 1.08) internal successors, (108), 100 states have internal predecessors, (108), 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) [2022-11-23 15:05:01,853 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:05:01,853 INFO L93 Difference]: Finished difference Result 69 states and 72 transitions. [2022-11-23 15:05:01,854 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2022-11-23 15:05:01,854 INFO L78 Accepts]: Start accepts. Automaton has has 100 states, 100 states have (on average 1.08) internal successors, (108), 100 states have internal predecessors, (108), 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 46 [2022-11-23 15:05:01,854 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:05:01,855 INFO L225 Difference]: With dead ends: 69 [2022-11-23 15:05:01,855 INFO L226 Difference]: Without dead ends: 66 [2022-11-23 15:05:01,856 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 209 GetRequests, 62 SyntacticMatches, 16 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6578 ImplicationChecksByTransitivity, 20.7s TimeCoverageRelationStatistics Valid=966, Invalid=16590, Unknown=0, NotChecked=0, Total=17556 [2022-11-23 15:05:01,856 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 12 mSDsluCounter, 235 mSDsCounter, 0 mSdLazyCounter, 2727 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 240 SdHoareTripleChecker+Invalid, 2778 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 2727 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.6s IncrementalHoareTripleChecker+Time [2022-11-23 15:05:01,856 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 240 Invalid, 2778 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 2727 Invalid, 0 Unknown, 0 Unchecked, 3.6s Time] [2022-11-23 15:05:01,857 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2022-11-23 15:05:01,910 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 49. [2022-11-23 15:05:01,911 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 48 states have (on average 1.0833333333333333) internal successors, (52), 48 states have internal predecessors, (52), 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) [2022-11-23 15:05:01,911 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 52 transitions. [2022-11-23 15:05:01,911 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 52 transitions. Word has length 46 [2022-11-23 15:05:01,911 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:05:01,911 INFO L495 AbstractCegarLoop]: Abstraction has 49 states and 52 transitions. [2022-11-23 15:05:01,911 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 100 states, 100 states have (on average 1.08) internal successors, (108), 100 states have internal predecessors, (108), 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) [2022-11-23 15:05:01,911 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 52 transitions. [2022-11-23 15:05:01,912 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-11-23 15:05:01,912 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:05:01,912 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 13, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:05:01,917 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Forceful destruction successful, exit code 0 [2022-11-23 15:05:02,115 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2022-11-23 15:05:02,115 INFO L420 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:05:02,115 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:05:02,115 INFO L85 PathProgramCache]: Analyzing trace with hash -1166433043, now seen corresponding path program 37 times [2022-11-23 15:05:02,116 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:05:02,116 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1197436004] [2022-11-23 15:05:02,116 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:05:02,116 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:05:02,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:05:02,558 INFO L134 CoverageAnalysis]: Checked inductivity of 287 backedges. 92 proven. 104 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2022-11-23 15:05:02,558 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:05:02,558 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1197436004] [2022-11-23 15:05:02,558 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1197436004] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:05:02,558 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1087414666] [2022-11-23 15:05:02,558 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-23 15:05:02,558 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:05:02,559 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:05:02,559 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:05:02,562 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2022-11-23 15:05:02,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:05:02,705 INFO L263 TraceCheckSpWp]: Trace formula consists of 287 conjuncts, 30 conjunts are in the unsatisfiable core [2022-11-23 15:05:02,707 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:05:03,171 INFO L134 CoverageAnalysis]: Checked inductivity of 287 backedges. 105 proven. 91 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2022-11-23 15:05:03,171 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:05:03,544 INFO L134 CoverageAnalysis]: Checked inductivity of 287 backedges. 105 proven. 91 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2022-11-23 15:05:03,544 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1087414666] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:05:03,544 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1336924005] [2022-11-23 15:05:03,545 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-23 15:05:03,545 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:05:03,546 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:05:03,546 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:05:03,546 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:05:03,606 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-23 15:05:03,606 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 26 treesize of output 46 [2022-11-23 15:05:03,663 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-23 15:05:03,663 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-23 15:05:03,682 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 [2022-11-23 15:05:03,719 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:05:03,719 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 15:05:03,742 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-23 15:05:03,742 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 245 treesize of output 248 [2022-11-23 15:05:03,791 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 [2022-11-23 15:05:03,854 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:05:04,723 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13913#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-23 15:05:04,724 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:05:04,724 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:05:04,724 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 46 [2022-11-23 15:05:04,724 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1153299439] [2022-11-23 15:05:04,724 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:05:04,724 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2022-11-23 15:05:04,725 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:05:04,725 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2022-11-23 15:05:04,725 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=540, Invalid=2010, Unknown=0, NotChecked=0, Total=2550 [2022-11-23 15:05:04,725 INFO L87 Difference]: Start difference. First operand 49 states and 52 transitions. Second operand has 46 states, 46 states have (on average 1.173913043478261) internal successors, (54), 46 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) [2022-11-23 15:05:05,303 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:05:05,303 INFO L93 Difference]: Finished difference Result 99 states and 105 transitions. [2022-11-23 15:05:05,303 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2022-11-23 15:05:05,303 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 1.173913043478261) internal successors, (54), 46 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 47 [2022-11-23 15:05:05,304 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:05:05,304 INFO L225 Difference]: With dead ends: 99 [2022-11-23 15:05:05,304 INFO L226 Difference]: Without dead ends: 53 [2022-11-23 15:05:05,305 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 79 SyntacticMatches, 41 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2312 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=883, Invalid=3277, Unknown=0, NotChecked=0, Total=4160 [2022-11-23 15:05:05,305 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 7 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 267 mSolverCounterSat, 203 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 470 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 203 IncrementalHoareTripleChecker+Valid, 267 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-23 15:05:05,306 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 17 Invalid, 470 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [203 Valid, 267 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-23 15:05:05,306 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2022-11-23 15:05:05,360 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 49. [2022-11-23 15:05:05,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 48 states have (on average 1.0625) internal successors, (51), 48 states have internal predecessors, (51), 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) [2022-11-23 15:05:05,361 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 51 transitions. [2022-11-23 15:05:05,361 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 51 transitions. Word has length 47 [2022-11-23 15:05:05,361 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:05:05,361 INFO L495 AbstractCegarLoop]: Abstraction has 49 states and 51 transitions. [2022-11-23 15:05:05,362 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 1.173913043478261) internal successors, (54), 46 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) [2022-11-23 15:05:05,362 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 51 transitions. [2022-11-23 15:05:05,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-11-23 15:05:05,362 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:05:05,362 INFO L195 NwaCegarLoop]: trace histogram [14, 14, 13, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:05:05,371 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Forceful destruction successful, exit code 0 [2022-11-23 15:05:05,568 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2022-11-23 15:05:05,568 INFO L420 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:05:05,569 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:05:05,569 INFO L85 PathProgramCache]: Analyzing trace with hash -423007027, now seen corresponding path program 38 times [2022-11-23 15:05:05,569 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:05:05,569 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1175929908] [2022-11-23 15:05:05,569 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:05:05,569 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:05:05,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:05:06,072 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 78 proven. 118 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2022-11-23 15:05:06,072 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:05:06,072 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1175929908] [2022-11-23 15:05:06,073 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1175929908] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:05:06,073 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [70173445] [2022-11-23 15:05:06,073 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 15:05:06,073 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:05:06,073 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:05:06,074 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:05:06,076 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2022-11-23 15:05:06,332 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2022-11-23 15:05:06,333 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 15:05:06,335 INFO L263 TraceCheckSpWp]: Trace formula consists of 294 conjuncts, 30 conjunts are in the unsatisfiable core [2022-11-23 15:05:06,336 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:05:06,703 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 91 proven. 105 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2022-11-23 15:05:06,703 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:05:07,082 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 91 proven. 105 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2022-11-23 15:05:07,082 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [70173445] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:05:07,083 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2009683594] [2022-11-23 15:05:07,083 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-23 15:05:07,083 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:05:07,083 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:05:07,084 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:05:07,084 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:05:07,134 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-23 15:05:07,135 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 26 treesize of output 46 [2022-11-23 15:05:07,184 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-23 15:05:07,184 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-23 15:05:07,203 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 [2022-11-23 15:05:07,243 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:05:07,245 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:05:07,257 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-23 15:05:07,257 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 250 treesize of output 247 [2022-11-23 15:05:07,305 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 [2022-11-23 15:05:07,350 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:05:07,617 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '14555#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-23 15:05:07,618 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:05:07,618 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:05:07,618 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 47 [2022-11-23 15:05:07,618 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1750224568] [2022-11-23 15:05:07,618 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:05:07,618 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2022-11-23 15:05:07,619 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:05:07,619 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2022-11-23 15:05:07,620 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=535, Invalid=2117, Unknown=0, NotChecked=0, Total=2652 [2022-11-23 15:05:07,620 INFO L87 Difference]: Start difference. First operand 49 states and 51 transitions. Second operand has 47 states, 47 states have (on average 1.4680851063829787) internal successors, (69), 47 states have internal predecessors, (69), 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) [2022-11-23 15:05:08,171 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:05:08,171 INFO L93 Difference]: Finished difference Result 53 states and 55 transitions. [2022-11-23 15:05:08,172 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-11-23 15:05:08,172 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 1.4680851063829787) internal successors, (69), 47 states have internal predecessors, (69), 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 48 [2022-11-23 15:05:08,172 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:05:08,172 INFO L225 Difference]: With dead ends: 53 [2022-11-23 15:05:08,172 INFO L226 Difference]: Without dead ends: 50 [2022-11-23 15:05:08,173 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 96 SyntacticMatches, 28 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2248 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=903, Invalid=3653, Unknown=0, NotChecked=0, Total=4556 [2022-11-23 15:05:08,173 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 28 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 349 mSolverCounterSat, 130 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 479 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 130 IncrementalHoareTripleChecker+Valid, 349 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-23 15:05:08,174 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [28 Valid, 17 Invalid, 479 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [130 Valid, 349 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-23 15:05:08,174 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2022-11-23 15:05:08,238 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2022-11-23 15:05:08,239 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 49 states have (on average 1.0612244897959184) internal successors, (52), 49 states have internal predecessors, (52), 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) [2022-11-23 15:05:08,239 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 52 transitions. [2022-11-23 15:05:08,239 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 52 transitions. Word has length 48 [2022-11-23 15:05:08,239 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:05:08,239 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 52 transitions. [2022-11-23 15:05:08,239 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 1.4680851063829787) internal successors, (69), 47 states have internal predecessors, (69), 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) [2022-11-23 15:05:08,239 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 52 transitions. [2022-11-23 15:05:08,240 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-11-23 15:05:08,240 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:05:08,240 INFO L195 NwaCegarLoop]: trace histogram [14, 14, 14, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:05:08,247 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Ended with exit code 0 [2022-11-23 15:05:08,446 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2022-11-23 15:05:08,446 INFO L420 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:05:08,447 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:05:08,447 INFO L85 PathProgramCache]: Analyzing trace with hash -228471641, now seen corresponding path program 39 times [2022-11-23 15:05:08,447 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:05:08,447 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [134890909] [2022-11-23 15:05:08,447 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:05:08,447 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:05:08,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:05:13,996 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 0 proven. 315 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 15:05:13,996 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:05:13,996 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [134890909] [2022-11-23 15:05:13,996 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [134890909] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:05:13,996 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [179312397] [2022-11-23 15:05:13,996 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 15:05:13,997 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:05:13,997 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:05:13,997 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:05:14,000 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2022-11-23 15:05:14,181 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 15:05:14,181 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 15:05:14,185 INFO L263 TraceCheckSpWp]: Trace formula consists of 299 conjuncts, 122 conjunts are in the unsatisfiable core [2022-11-23 15:05:14,187 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:05:18,651 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2022-11-23 15:05:18,651 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:05:32,749 WARN L233 SmtUtils]: Spent 6.36s on a formula simplification that was a NOOP. DAG size: 673 (called from [L 318] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.arrays.Elim1Store.elim1) [2022-11-23 15:05:32,750 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 15:05:32,750 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 28 select indices, 28 select index equivalence classes, 0 disjoint index pairs (out of 378 index pairs), introduced 28 new quantified variables, introduced 378 case distinctions, treesize of input 240 treesize of output 2176 [2022-11-23 15:07:20,286 INFO L321 Elim1Store]: treesize reduction 2086, result has 2.7 percent of original size [2022-11-23 15:07:20,286 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 28 select indices, 28 select index equivalence classes, 0 disjoint index pairs (out of 378 index pairs), introduced 28 new quantified variables, introduced 378 case distinctions, treesize of input 239 treesize of output 89 [2022-11-23 15:07:20,474 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2022-11-23 15:07:20,474 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [179312397] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:07:20,474 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2080823175] [2022-11-23 15:07:20,478 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-23 15:07:20,479 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:07:20,479 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:07:20,479 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:07:20,479 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:07:20,533 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-23 15:07:20,533 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-23 15:07:20,543 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 [2022-11-23 15:07:20,559 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 [2022-11-23 15:07:20,604 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:07:20,607 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:07:20,619 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-23 15:07:20,620 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 250 treesize of output 247 [2022-11-23 15:07:20,666 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 [2022-11-23 15:07:20,711 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:07:21,772 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15181#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-23 15:07:21,773 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:07:21,773 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:07:21,773 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 34, 33] total 107 [2022-11-23 15:07:21,773 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1020504926] [2022-11-23 15:07:21,773 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:07:21,774 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 107 states [2022-11-23 15:07:21,774 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:07:21,774 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 107 interpolants. [2022-11-23 15:07:21,775 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=428, Invalid=12004, Unknown=0, NotChecked=0, Total=12432 [2022-11-23 15:07:21,775 INFO L87 Difference]: Start difference. First operand 50 states and 52 transitions. Second operand has 107 states, 107 states have (on average 1.074766355140187) internal successors, (115), 107 states have internal predecessors, (115), 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) [2022-11-23 15:07:29,273 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:07:29,273 INFO L93 Difference]: Finished difference Result 69 states and 72 transitions. [2022-11-23 15:07:29,273 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2022-11-23 15:07:29,273 INFO L78 Accepts]: Start accepts. Automaton has has 107 states, 107 states have (on average 1.074766355140187) internal successors, (115), 107 states have internal predecessors, (115), 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 [2022-11-23 15:07:29,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:07:29,274 INFO L225 Difference]: With dead ends: 69 [2022-11-23 15:07:29,274 INFO L226 Difference]: Without dead ends: 66 [2022-11-23 15:07:29,275 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 81 SyntacticMatches, 2 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2921 ImplicationChecksByTransitivity, 19.2s TimeCoverageRelationStatistics Valid=616, Invalid=16154, Unknown=0, NotChecked=0, Total=16770 [2022-11-23 15:07:29,275 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 8 mSDsluCounter, 104 mSDsCounter, 0 mSdLazyCounter, 2803 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 107 SdHoareTripleChecker+Invalid, 2814 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 2803 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.6s IncrementalHoareTripleChecker+Time [2022-11-23 15:07:29,275 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 107 Invalid, 2814 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 2803 Invalid, 0 Unknown, 0 Unchecked, 3.6s Time] [2022-11-23 15:07:29,276 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2022-11-23 15:07:29,338 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 52. [2022-11-23 15:07:29,338 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 51 states have (on average 1.0784313725490196) internal successors, (55), 51 states have internal predecessors, (55), 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) [2022-11-23 15:07:29,339 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 55 transitions. [2022-11-23 15:07:29,339 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 55 transitions. Word has length 49 [2022-11-23 15:07:29,339 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:07:29,339 INFO L495 AbstractCegarLoop]: Abstraction has 52 states and 55 transitions. [2022-11-23 15:07:29,339 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 107 states, 107 states have (on average 1.074766355140187) internal successors, (115), 107 states have internal predecessors, (115), 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) [2022-11-23 15:07:29,339 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 55 transitions. [2022-11-23 15:07:29,340 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-11-23 15:07:29,340 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:07:29,340 INFO L195 NwaCegarLoop]: trace histogram [15, 14, 14, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:07:29,351 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Forceful destruction successful, exit code 0 [2022-11-23 15:07:29,546 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:07:29,547 INFO L420 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:07:29,547 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:07:29,547 INFO L85 PathProgramCache]: Analyzing trace with hash 1130826044, now seen corresponding path program 40 times [2022-11-23 15:07:29,547 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:07:29,547 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1365903319] [2022-11-23 15:07:29,547 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:07:29,547 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:07:29,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:07:30,107 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 106 proven. 119 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2022-11-23 15:07:30,107 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:07:30,107 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1365903319] [2022-11-23 15:07:30,107 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1365903319] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:07:30,108 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [637805249] [2022-11-23 15:07:30,108 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-23 15:07:30,108 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:07:30,108 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:07:30,109 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:07:30,111 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2022-11-23 15:07:30,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:07:30,266 INFO L263 TraceCheckSpWp]: Trace formula consists of 304 conjuncts, 32 conjunts are in the unsatisfiable core [2022-11-23 15:07:30,267 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:07:30,782 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 120 proven. 105 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2022-11-23 15:07:30,782 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:07:31,179 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 120 proven. 105 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2022-11-23 15:07:31,179 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [637805249] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:07:31,180 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1016048088] [2022-11-23 15:07:31,181 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-23 15:07:31,181 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:07:31,181 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:07:31,181 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:07:31,181 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:07:31,233 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-23 15:07:31,234 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 26 treesize of output 46 [2022-11-23 15:07:31,284 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-23 15:07:31,284 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-23 15:07:31,301 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-23 15:07:31,340 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:07:31,341 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 15:07:31,364 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-23 15:07:31,364 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 245 treesize of output 248 [2022-11-23 15:07:31,448 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 [2022-11-23 15:07:31,504 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:07:31,841 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15794#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-23 15:07:31,841 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:07:31,842 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:07:31,842 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 49 [2022-11-23 15:07:31,842 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [60851904] [2022-11-23 15:07:31,842 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:07:31,842 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2022-11-23 15:07:31,842 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:07:31,843 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2022-11-23 15:07:31,843 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=607, Invalid=2255, Unknown=0, NotChecked=0, Total=2862 [2022-11-23 15:07:31,843 INFO L87 Difference]: Start difference. First operand 52 states and 55 transitions. Second operand has 49 states, 49 states have (on average 1.163265306122449) internal successors, (57), 49 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) [2022-11-23 15:07:32,515 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:07:32,515 INFO L93 Difference]: Finished difference Result 105 states and 111 transitions. [2022-11-23 15:07:32,515 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-11-23 15:07:32,516 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 1.163265306122449) internal successors, (57), 49 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 50 [2022-11-23 15:07:32,516 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:07:32,516 INFO L225 Difference]: With dead ends: 105 [2022-11-23 15:07:32,516 INFO L226 Difference]: Without dead ends: 56 [2022-11-23 15:07:32,517 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 99 SyntacticMatches, 29 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1915 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=997, Invalid=3695, Unknown=0, NotChecked=0, Total=4692 [2022-11-23 15:07:32,517 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 15 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 310 mSolverCounterSat, 216 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 526 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 216 IncrementalHoareTripleChecker+Valid, 310 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-23 15:07:32,517 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 19 Invalid, 526 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [216 Valid, 310 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-23 15:07:32,517 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2022-11-23 15:07:32,592 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 52. [2022-11-23 15:07:32,593 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 51 states have (on average 1.0588235294117647) internal successors, (54), 51 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) [2022-11-23 15:07:32,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 54 transitions. [2022-11-23 15:07:32,593 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 54 transitions. Word has length 50 [2022-11-23 15:07:32,593 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:07:32,593 INFO L495 AbstractCegarLoop]: Abstraction has 52 states and 54 transitions. [2022-11-23 15:07:32,593 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 1.163265306122449) internal successors, (57), 49 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) [2022-11-23 15:07:32,593 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 54 transitions. [2022-11-23 15:07:32,594 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2022-11-23 15:07:32,594 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:07:32,594 INFO L195 NwaCegarLoop]: trace histogram [15, 15, 14, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:07:32,603 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Forceful destruction successful, exit code 0 [2022-11-23 15:07:32,799 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:07:32,799 INFO L420 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:07:32,799 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:07:32,799 INFO L85 PathProgramCache]: Analyzing trace with hash -611076772, now seen corresponding path program 41 times [2022-11-23 15:07:32,800 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:07:32,800 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [939609411] [2022-11-23 15:07:32,800 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:07:32,800 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:07:32,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:07:33,376 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 91 proven. 134 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2022-11-23 15:07:33,376 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:07:33,376 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [939609411] [2022-11-23 15:07:33,376 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [939609411] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:07:33,376 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1071976190] [2022-11-23 15:07:33,376 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 15:07:33,377 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:07:33,377 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:07:33,378 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:07:33,381 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2022-11-23 15:07:33,745 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2022-11-23 15:07:33,745 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 15:07:33,748 INFO L263 TraceCheckSpWp]: Trace formula consists of 311 conjuncts, 32 conjunts are in the unsatisfiable core [2022-11-23 15:07:33,749 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:07:34,159 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 105 proven. 120 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2022-11-23 15:07:34,159 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:07:34,605 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 105 proven. 120 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2022-11-23 15:07:34,605 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1071976190] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:07:34,605 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [337995977] [2022-11-23 15:07:34,606 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-23 15:07:34,606 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:07:34,606 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:07:34,607 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:07:34,607 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:07:34,659 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-23 15:07:34,659 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 26 treesize of output 46 [2022-11-23 15:07:34,711 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-23 15:07:34,711 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-23 15:07:34,732 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 [2022-11-23 15:07:34,787 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:07:34,789 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:07:34,801 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-23 15:07:34,802 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 250 treesize of output 247 [2022-11-23 15:07:34,856 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 [2022-11-23 15:07:34,902 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:07:35,181 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16477#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-23 15:07:35,181 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:07:35,182 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:07:35,182 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 50 [2022-11-23 15:07:35,182 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [33072002] [2022-11-23 15:07:35,182 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:07:35,182 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2022-11-23 15:07:35,183 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:07:35,183 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2022-11-23 15:07:35,183 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=601, Invalid=2369, Unknown=0, NotChecked=0, Total=2970 [2022-11-23 15:07:35,184 INFO L87 Difference]: Start difference. First operand 52 states and 54 transitions. Second operand has 50 states, 50 states have (on average 1.14) internal successors, (57), 50 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) [2022-11-23 15:07:35,815 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:07:35,816 INFO L93 Difference]: Finished difference Result 56 states and 58 transitions. [2022-11-23 15:07:35,816 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-11-23 15:07:35,816 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 1.14) internal successors, (57), 50 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 51 [2022-11-23 15:07:35,816 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:07:35,817 INFO L225 Difference]: With dead ends: 56 [2022-11-23 15:07:35,817 INFO L226 Difference]: Without dead ends: 53 [2022-11-23 15:07:35,817 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 101 SyntacticMatches, 30 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2544 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1017, Invalid=4095, Unknown=0, NotChecked=0, Total=5112 [2022-11-23 15:07:35,818 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 25 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 456 mSolverCounterSat, 167 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 623 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 167 IncrementalHoareTripleChecker+Valid, 456 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-23 15:07:35,818 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [25 Valid, 17 Invalid, 623 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [167 Valid, 456 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-23 15:07:35,819 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2022-11-23 15:07:35,882 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2022-11-23 15:07:35,883 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 52 states have (on average 1.0576923076923077) internal successors, (55), 52 states have internal predecessors, (55), 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) [2022-11-23 15:07:35,883 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 55 transitions. [2022-11-23 15:07:35,883 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 55 transitions. Word has length 51 [2022-11-23 15:07:35,883 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:07:35,883 INFO L495 AbstractCegarLoop]: Abstraction has 53 states and 55 transitions. [2022-11-23 15:07:35,884 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 1.14) internal successors, (57), 50 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) [2022-11-23 15:07:35,884 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 55 transitions. [2022-11-23 15:07:35,884 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2022-11-23 15:07:35,884 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:07:35,884 INFO L195 NwaCegarLoop]: trace histogram [15, 15, 15, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:07:35,890 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Forceful destruction successful, exit code 0 [2022-11-23 15:07:36,085 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42,42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:07:36,086 INFO L420 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:07:36,086 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:07:36,086 INFO L85 PathProgramCache]: Analyzing trace with hash -1763666440, now seen corresponding path program 42 times [2022-11-23 15:07:36,086 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:07:36,086 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [156902837] [2022-11-23 15:07:36,087 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:07:36,087 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:07:36,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:07:42,949 INFO L134 CoverageAnalysis]: Checked inductivity of 360 backedges. 0 proven. 360 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 15:07:42,949 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:07:42,949 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [156902837] [2022-11-23 15:07:42,949 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [156902837] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:07:42,950 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [74374232] [2022-11-23 15:07:42,950 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 15:07:42,950 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:07:42,950 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:07:42,951 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:07:42,953 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2022-11-23 15:07:43,338 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 15:07:43,338 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 15:07:43,343 INFO L263 TraceCheckSpWp]: Trace formula consists of 316 conjuncts, 132 conjunts are in the unsatisfiable core [2022-11-23 15:07:43,347 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:07:43,475 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 [2022-11-23 15:07:48,727 INFO L134 CoverageAnalysis]: Checked inductivity of 360 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2022-11-23 15:07:48,727 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:07:58,626 INFO L134 CoverageAnalysis]: Checked inductivity of 360 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2022-11-23 15:07:58,626 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [74374232] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:07:58,626 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [951333528] [2022-11-23 15:07:58,627 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-23 15:07:58,627 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:07:58,628 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:07:58,628 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:07:58,628 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:07:58,678 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-23 15:07:58,678 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 26 treesize of output 46 [2022-11-23 15:07:58,729 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-23 15:07:58,730 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-23 15:07:58,755 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 [2022-11-23 15:07:58,799 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:07:58,801 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:07:58,814 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-23 15:07:58,814 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 250 treesize of output 247 [2022-11-23 15:07:58,856 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 [2022-11-23 15:07:58,902 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:08:00,039 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '17141#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-23 15:08:00,040 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:08:00,040 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:08:00,040 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 36, 35] total 114 [2022-11-23 15:08:00,040 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1903689371] [2022-11-23 15:08:00,040 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:08:00,041 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 114 states [2022-11-23 15:08:00,041 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:08:00,041 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 114 interpolants. [2022-11-23 15:08:00,042 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=461, Invalid=13581, Unknown=0, NotChecked=0, Total=14042 [2022-11-23 15:08:00,042 INFO L87 Difference]: Start difference. First operand 53 states and 55 transitions. Second operand has 114 states, 114 states have (on average 1.0701754385964912) internal successors, (122), 114 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) [2022-11-23 15:08:09,825 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:08:09,825 INFO L93 Difference]: Finished difference Result 73 states and 76 transitions. [2022-11-23 15:08:09,827 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2022-11-23 15:08:09,827 INFO L78 Accepts]: Start accepts. Automaton has has 114 states, 114 states have (on average 1.0701754385964912) internal successors, (122), 114 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) Word has length 52 [2022-11-23 15:08:09,827 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:08:09,828 INFO L225 Difference]: With dead ends: 73 [2022-11-23 15:08:09,828 INFO L226 Difference]: Without dead ends: 70 [2022-11-23 15:08:09,830 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 225 GetRequests, 86 SyntacticMatches, 2 SemanticMatches, 137 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3240 ImplicationChecksByTransitivity, 23.4s TimeCoverageRelationStatistics Valid=673, Invalid=18509, Unknown=0, NotChecked=0, Total=19182 [2022-11-23 15:08:09,830 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 3 mSDsluCounter, 140 mSDsCounter, 0 mSdLazyCounter, 3795 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 143 SdHoareTripleChecker+Invalid, 3805 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 3795 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.9s IncrementalHoareTripleChecker+Time [2022-11-23 15:08:09,830 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 143 Invalid, 3805 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 3795 Invalid, 0 Unknown, 0 Unchecked, 4.9s Time] [2022-11-23 15:08:09,831 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2022-11-23 15:08:09,926 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 55. [2022-11-23 15:08:09,926 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 54 states have (on average 1.0740740740740742) internal successors, (58), 54 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) [2022-11-23 15:08:09,927 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 58 transitions. [2022-11-23 15:08:09,927 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 58 transitions. Word has length 52 [2022-11-23 15:08:09,927 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:08:09,927 INFO L495 AbstractCegarLoop]: Abstraction has 55 states and 58 transitions. [2022-11-23 15:08:09,927 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 114 states, 114 states have (on average 1.0701754385964912) internal successors, (122), 114 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) [2022-11-23 15:08:09,928 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 58 transitions. [2022-11-23 15:08:09,928 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2022-11-23 15:08:09,928 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:08:09,928 INFO L195 NwaCegarLoop]: trace histogram [16, 15, 15, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:08:09,933 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Forceful destruction successful, exit code 0 [2022-11-23 15:08:10,129 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable43 [2022-11-23 15:08:10,129 INFO L420 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:08:10,129 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:08:10,129 INFO L85 PathProgramCache]: Analyzing trace with hash -1915597427, now seen corresponding path program 43 times [2022-11-23 15:08:10,129 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:08:10,129 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [106734708] [2022-11-23 15:08:10,129 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:08:10,129 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:08:10,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:08:10,780 INFO L134 CoverageAnalysis]: Checked inductivity of 376 backedges. 121 proven. 135 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2022-11-23 15:08:10,781 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:08:10,781 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [106734708] [2022-11-23 15:08:10,781 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [106734708] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:08:10,781 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1058800248] [2022-11-23 15:08:10,781 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-23 15:08:10,781 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:08:10,781 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:08:10,782 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:08:10,784 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2022-11-23 15:08:10,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:08:10,955 INFO L263 TraceCheckSpWp]: Trace formula consists of 321 conjuncts, 34 conjunts are in the unsatisfiable core [2022-11-23 15:08:10,956 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:08:11,532 INFO L134 CoverageAnalysis]: Checked inductivity of 376 backedges. 136 proven. 120 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2022-11-23 15:08:11,532 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:08:11,977 INFO L134 CoverageAnalysis]: Checked inductivity of 376 backedges. 136 proven. 120 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2022-11-23 15:08:11,977 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1058800248] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:08:11,977 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1463198574] [2022-11-23 15:08:11,978 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-23 15:08:11,978 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:08:11,979 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:08:11,979 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:08:11,979 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:08:12,033 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-23 15:08:12,034 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-23 15:08:12,044 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 [2022-11-23 15:08:12,064 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 [2022-11-23 15:08:12,104 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:08:12,106 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:08:12,118 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-23 15:08:12,119 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 250 treesize of output 247 [2022-11-23 15:08:12,161 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-23 15:08:12,202 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:08:12,553 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '17793#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-23 15:08:12,553 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:08:12,553 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:08:12,553 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 52 [2022-11-23 15:08:12,554 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1561294514] [2022-11-23 15:08:12,554 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:08:12,554 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2022-11-23 15:08:12,554 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:08:12,555 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2022-11-23 15:08:12,555 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=678, Invalid=2514, Unknown=0, NotChecked=0, Total=3192 [2022-11-23 15:08:12,555 INFO L87 Difference]: Start difference. First operand 55 states and 58 transitions. Second operand has 52 states, 52 states have (on average 1.1538461538461537) internal successors, (60), 52 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) [2022-11-23 15:08:13,256 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:08:13,256 INFO L93 Difference]: Finished difference Result 111 states and 117 transitions. [2022-11-23 15:08:13,257 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-11-23 15:08:13,257 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 1.1538461538461537) internal successors, (60), 52 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 53 [2022-11-23 15:08:13,257 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:08:13,257 INFO L225 Difference]: With dead ends: 111 [2022-11-23 15:08:13,257 INFO L226 Difference]: Without dead ends: 59 [2022-11-23 15:08:13,258 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 207 GetRequests, 105 SyntacticMatches, 31 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2147 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1118, Invalid=4138, Unknown=0, NotChecked=0, Total=5256 [2022-11-23 15:08:13,258 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 11 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 290 mSolverCounterSat, 222 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 512 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 222 IncrementalHoareTripleChecker+Valid, 290 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-23 15:08:13,258 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 21 Invalid, 512 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [222 Valid, 290 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-23 15:08:13,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2022-11-23 15:08:13,351 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 55. [2022-11-23 15:08:13,351 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 54 states have (on average 1.0555555555555556) internal successors, (57), 54 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) [2022-11-23 15:08:13,351 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 57 transitions. [2022-11-23 15:08:13,351 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 57 transitions. Word has length 53 [2022-11-23 15:08:13,352 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:08:13,352 INFO L495 AbstractCegarLoop]: Abstraction has 55 states and 57 transitions. [2022-11-23 15:08:13,352 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 1.1538461538461537) internal successors, (60), 52 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) [2022-11-23 15:08:13,352 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 57 transitions. [2022-11-23 15:08:13,352 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2022-11-23 15:08:13,352 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:08:13,352 INFO L195 NwaCegarLoop]: trace histogram [16, 16, 15, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:08:13,359 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Ended with exit code 0 [2022-11-23 15:08:13,553 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable44 [2022-11-23 15:08:13,553 INFO L420 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:08:13,553 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:08:13,553 INFO L85 PathProgramCache]: Analyzing trace with hash 1147448685, now seen corresponding path program 44 times [2022-11-23 15:08:13,553 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:08:13,553 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1432474581] [2022-11-23 15:08:13,553 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:08:13,554 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:08:13,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:08:14,216 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 105 proven. 151 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2022-11-23 15:08:14,216 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:08:14,216 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1432474581] [2022-11-23 15:08:14,216 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1432474581] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:08:14,216 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2068969921] [2022-11-23 15:08:14,216 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 15:08:14,216 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:08:14,217 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:08:14,217 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:08:14,220 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2022-11-23 15:08:14,535 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2022-11-23 15:08:14,535 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 15:08:14,538 INFO L263 TraceCheckSpWp]: Trace formula consists of 328 conjuncts, 34 conjunts are in the unsatisfiable core [2022-11-23 15:08:14,539 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:08:15,007 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 120 proven. 136 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2022-11-23 15:08:15,007 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:08:15,546 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 120 proven. 136 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2022-11-23 15:08:15,546 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2068969921] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:08:15,546 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [669807038] [2022-11-23 15:08:15,547 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-23 15:08:15,547 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:08:15,547 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:08:15,547 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:08:15,548 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:08:15,598 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-23 15:08:15,598 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 26 treesize of output 46 [2022-11-23 15:08:15,649 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-23 15:08:15,649 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-23 15:08:15,677 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 [2022-11-23 15:08:15,731 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:08:15,731 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 15:08:15,756 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-23 15:08:15,756 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 245 treesize of output 248 [2022-11-23 15:08:15,841 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 [2022-11-23 15:08:15,904 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:08:16,700 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '18517#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-23 15:08:16,700 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:08:16,700 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:08:16,700 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 53 [2022-11-23 15:08:16,701 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [715438701] [2022-11-23 15:08:16,701 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:08:16,701 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2022-11-23 15:08:16,701 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:08:16,702 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2022-11-23 15:08:16,702 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=671, Invalid=2635, Unknown=0, NotChecked=0, Total=3306 [2022-11-23 15:08:16,702 INFO L87 Difference]: Start difference. First operand 55 states and 57 transitions. Second operand has 53 states, 53 states have (on average 1.1320754716981132) internal successors, (60), 53 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) [2022-11-23 15:08:17,390 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:08:17,390 INFO L93 Difference]: Finished difference Result 59 states and 61 transitions. [2022-11-23 15:08:17,390 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-11-23 15:08:17,391 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 1.1320754716981132) internal successors, (60), 53 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 54 [2022-11-23 15:08:17,391 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:08:17,391 INFO L225 Difference]: With dead ends: 59 [2022-11-23 15:08:17,391 INFO L226 Difference]: Without dead ends: 56 [2022-11-23 15:08:17,392 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 213 GetRequests, 91 SyntacticMatches, 48 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3914 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=1138, Invalid=4562, Unknown=0, NotChecked=0, Total=5700 [2022-11-23 15:08:17,393 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 29 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 493 mSolverCounterSat, 185 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 678 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 185 IncrementalHoareTripleChecker+Valid, 493 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-23 15:08:17,393 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [29 Valid, 19 Invalid, 678 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [185 Valid, 493 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-23 15:08:17,393 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2022-11-23 15:08:17,467 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2022-11-23 15:08:17,467 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 55 states have (on average 1.0545454545454545) internal successors, (58), 55 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) [2022-11-23 15:08:17,467 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 58 transitions. [2022-11-23 15:08:17,467 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 58 transitions. Word has length 54 [2022-11-23 15:08:17,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:08:17,467 INFO L495 AbstractCegarLoop]: Abstraction has 56 states and 58 transitions. [2022-11-23 15:08:17,468 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 1.1320754716981132) internal successors, (60), 53 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) [2022-11-23 15:08:17,468 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 58 transitions. [2022-11-23 15:08:17,468 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-11-23 15:08:17,468 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:08:17,468 INFO L195 NwaCegarLoop]: trace histogram [16, 16, 16, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:08:17,474 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Forceful destruction successful, exit code 0 [2022-11-23 15:08:17,668 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45,45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:08:17,669 INFO L420 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:08:17,669 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:08:17,669 INFO L85 PathProgramCache]: Analyzing trace with hash 1211015175, now seen corresponding path program 45 times [2022-11-23 15:08:17,669 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:08:17,669 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1299270765] [2022-11-23 15:08:17,669 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:08:17,669 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:08:17,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:08:24,939 INFO L134 CoverageAnalysis]: Checked inductivity of 408 backedges. 0 proven. 408 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 15:08:24,939 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:08:24,939 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1299270765] [2022-11-23 15:08:24,940 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1299270765] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:08:24,940 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2099285351] [2022-11-23 15:08:24,940 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 15:08:24,940 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:08:24,940 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:08:24,941 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:08:24,943 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2022-11-23 15:08:25,177 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 15:08:25,177 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 15:08:25,181 INFO L263 TraceCheckSpWp]: Trace formula consists of 333 conjuncts, 142 conjunts are in the unsatisfiable core [2022-11-23 15:08:25,184 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:08:25,326 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 [2022-11-23 15:08:31,349 INFO L134 CoverageAnalysis]: Checked inductivity of 408 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2022-11-23 15:08:31,350 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:08:42,936 INFO L134 CoverageAnalysis]: Checked inductivity of 408 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2022-11-23 15:08:42,936 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2099285351] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:08:42,936 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [75067332] [2022-11-23 15:08:42,937 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-23 15:08:42,937 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:08:42,938 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:08:42,938 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:08:42,938 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:08:42,988 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-23 15:08:42,989 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 26 treesize of output 46 [2022-11-23 15:08:43,039 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-23 15:08:43,039 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-23 15:08:43,060 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 [2022-11-23 15:08:43,103 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:08:43,104 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 15:08:43,127 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-23 15:08:43,127 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 245 treesize of output 248 [2022-11-23 15:08:43,178 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 [2022-11-23 15:08:43,224 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:08:44,466 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '19220#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-23 15:08:44,466 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:08:44,466 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:08:44,466 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 38, 37] total 121 [2022-11-23 15:08:44,466 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [534645962] [2022-11-23 15:08:44,467 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:08:44,467 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 121 states [2022-11-23 15:08:44,467 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:08:44,467 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 121 interpolants. [2022-11-23 15:08:44,468 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=496, Invalid=15254, Unknown=0, NotChecked=0, Total=15750 [2022-11-23 15:08:44,468 INFO L87 Difference]: Start difference. First operand 56 states and 58 transitions. Second operand has 121 states, 121 states have (on average 1.0661157024793388) internal successors, (129), 121 states have internal predecessors, (129), 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) [2022-11-23 15:08:55,872 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:08:55,872 INFO L93 Difference]: Finished difference Result 77 states and 80 transitions. [2022-11-23 15:08:55,872 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2022-11-23 15:08:55,873 INFO L78 Accepts]: Start accepts. Automaton has has 121 states, 121 states have (on average 1.0661157024793388) internal successors, (129), 121 states have internal predecessors, (129), 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 55 [2022-11-23 15:08:55,873 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:08:55,873 INFO L225 Difference]: With dead ends: 77 [2022-11-23 15:08:55,873 INFO L226 Difference]: Without dead ends: 74 [2022-11-23 15:08:55,874 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 91 SyntacticMatches, 2 SemanticMatches, 146 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3596 ImplicationChecksByTransitivity, 27.1s TimeCoverageRelationStatistics Valid=733, Invalid=21023, Unknown=0, NotChecked=0, Total=21756 [2022-11-23 15:08:55,875 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 4 mSDsluCounter, 154 mSDsCounter, 0 mSdLazyCounter, 4351 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 157 SdHoareTripleChecker+Invalid, 4360 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 4351 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.7s IncrementalHoareTripleChecker+Time [2022-11-23 15:08:55,875 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 157 Invalid, 4360 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 4351 Invalid, 0 Unknown, 0 Unchecked, 5.7s Time] [2022-11-23 15:08:55,875 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2022-11-23 15:08:55,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 58. [2022-11-23 15:08:55,970 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 57 states have (on average 1.0701754385964912) internal successors, (61), 57 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:08:55,970 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 61 transitions. [2022-11-23 15:08:55,970 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 61 transitions. Word has length 55 [2022-11-23 15:08:55,971 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:08:55,971 INFO L495 AbstractCegarLoop]: Abstraction has 58 states and 61 transitions. [2022-11-23 15:08:55,971 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 121 states, 121 states have (on average 1.0661157024793388) internal successors, (129), 121 states have internal predecessors, (129), 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) [2022-11-23 15:08:55,971 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 61 transitions. [2022-11-23 15:08:55,971 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2022-11-23 15:08:55,971 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:08:55,971 INFO L195 NwaCegarLoop]: trace histogram [17, 16, 16, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:08:55,977 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Forceful destruction successful, exit code 0 [2022-11-23 15:08:56,172 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46,46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:08:56,172 INFO L420 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:08:56,172 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:08:56,172 INFO L85 PathProgramCache]: Analyzing trace with hash -1991175652, now seen corresponding path program 46 times [2022-11-23 15:08:56,172 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:08:56,172 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [181352333] [2022-11-23 15:08:56,172 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:08:56,173 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:08:56,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:08:56,802 INFO L134 CoverageAnalysis]: Checked inductivity of 425 backedges. 137 proven. 152 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2022-11-23 15:08:56,803 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:08:56,803 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [181352333] [2022-11-23 15:08:56,803 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [181352333] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:08:56,803 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1222175744] [2022-11-23 15:08:56,803 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-23 15:08:56,803 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:08:56,803 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:08:56,804 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:08:56,806 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2022-11-23 15:08:56,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:08:56,990 INFO L263 TraceCheckSpWp]: Trace formula consists of 338 conjuncts, 36 conjunts are in the unsatisfiable core [2022-11-23 15:08:56,993 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:08:57,625 INFO L134 CoverageAnalysis]: Checked inductivity of 425 backedges. 153 proven. 136 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2022-11-23 15:08:57,625 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:08:58,111 INFO L134 CoverageAnalysis]: Checked inductivity of 425 backedges. 153 proven. 136 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2022-11-23 15:08:58,112 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1222175744] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:08:58,112 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [10502109] [2022-11-23 15:08:58,113 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-23 15:08:58,113 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:08:58,113 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:08:58,113 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:08:58,113 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:08:58,184 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-23 15:08:58,184 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 26 treesize of output 46 [2022-11-23 15:08:58,237 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-23 15:08:58,237 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-23 15:08:58,260 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 [2022-11-23 15:08:58,299 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:08:58,301 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:08:58,313 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-23 15:08:58,314 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 250 treesize of output 247 [2022-11-23 15:08:58,368 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 [2022-11-23 15:08:58,409 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:08:58,771 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '19911#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-23 15:08:58,771 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:08:58,771 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:08:58,771 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 55 [2022-11-23 15:08:58,771 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [242450831] [2022-11-23 15:08:58,772 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:08:58,772 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2022-11-23 15:08:58,772 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:08:58,772 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2022-11-23 15:08:58,773 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=753, Invalid=2787, Unknown=0, NotChecked=0, Total=3540 [2022-11-23 15:08:58,773 INFO L87 Difference]: Start difference. First operand 58 states and 61 transitions. Second operand has 55 states, 55 states have (on average 1.1454545454545455) internal successors, (63), 55 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) [2022-11-23 15:08:59,553 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:08:59,553 INFO L93 Difference]: Finished difference Result 117 states and 123 transitions. [2022-11-23 15:08:59,554 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-11-23 15:08:59,554 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 1.1454545454545455) internal successors, (63), 55 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 56 [2022-11-23 15:08:59,554 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:08:59,554 INFO L225 Difference]: With dead ends: 117 [2022-11-23 15:08:59,555 INFO L226 Difference]: Without dead ends: 62 [2022-11-23 15:08:59,555 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 219 GetRequests, 111 SyntacticMatches, 33 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2392 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1246, Invalid=4606, Unknown=0, NotChecked=0, Total=5852 [2022-11-23 15:08:59,556 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 27 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 309 mSolverCounterSat, 262 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 571 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 262 IncrementalHoareTripleChecker+Valid, 309 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-23 15:08:59,556 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [27 Valid, 23 Invalid, 571 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [262 Valid, 309 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-23 15:08:59,556 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2022-11-23 15:08:59,661 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 58. [2022-11-23 15:08:59,662 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 57 states have (on average 1.0526315789473684) internal successors, (60), 57 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) [2022-11-23 15:08:59,662 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 60 transitions. [2022-11-23 15:08:59,662 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 60 transitions. Word has length 56 [2022-11-23 15:08:59,662 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:08:59,662 INFO L495 AbstractCegarLoop]: Abstraction has 58 states and 60 transitions. [2022-11-23 15:08:59,663 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 55 states have (on average 1.1454545454545455) internal successors, (63), 55 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) [2022-11-23 15:08:59,663 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 60 transitions. [2022-11-23 15:08:59,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2022-11-23 15:08:59,663 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:08:59,663 INFO L195 NwaCegarLoop]: trace histogram [17, 17, 16, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:08:59,670 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Forceful destruction successful, exit code 0 [2022-11-23 15:08:59,869 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2022-11-23 15:08:59,870 INFO L420 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:08:59,870 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:08:59,870 INFO L85 PathProgramCache]: Analyzing trace with hash -1659623876, now seen corresponding path program 47 times [2022-11-23 15:08:59,870 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:08:59,870 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1217468454] [2022-11-23 15:08:59,870 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:08:59,870 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:08:59,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:09:00,558 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 120 proven. 169 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2022-11-23 15:09:00,558 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:09:00,558 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1217468454] [2022-11-23 15:09:00,558 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1217468454] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:09:00,558 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [113333148] [2022-11-23 15:09:00,558 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 15:09:00,558 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:09:00,559 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:09:00,559 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:09:00,561 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Waiting until timeout for monitored process [2022-11-23 15:09:01,004 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2022-11-23 15:09:01,004 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 15:09:01,008 INFO L263 TraceCheckSpWp]: Trace formula consists of 345 conjuncts, 36 conjunts are in the unsatisfiable core [2022-11-23 15:09:01,009 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:09:01,514 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 136 proven. 153 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2022-11-23 15:09:01,514 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:09:02,057 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 136 proven. 153 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2022-11-23 15:09:02,057 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [113333148] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:09:02,057 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1846371888] [2022-11-23 15:09:02,058 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-23 15:09:02,058 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:09:02,059 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:09:02,059 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:09:02,059 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:09:02,112 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-23 15:09:02,113 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-23 15:09:02,122 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 [2022-11-23 15:09:02,142 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 [2022-11-23 15:09:02,183 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:09:02,183 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 15:09:02,207 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-23 15:09:02,207 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 245 treesize of output 248 [2022-11-23 15:09:02,278 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 [2022-11-23 15:09:02,334 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:09:03,190 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '20676#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-23 15:09:03,191 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:09:03,191 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:09:03,191 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 56 [2022-11-23 15:09:03,191 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [486101018] [2022-11-23 15:09:03,191 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:09:03,191 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2022-11-23 15:09:03,191 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:09:03,192 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2022-11-23 15:09:03,192 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=745, Invalid=2915, Unknown=0, NotChecked=0, Total=3660 [2022-11-23 15:09:03,192 INFO L87 Difference]: Start difference. First operand 58 states and 60 transitions. Second operand has 56 states, 56 states have (on average 1.125) internal successors, (63), 56 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) [2022-11-23 15:09:03,909 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:09:03,909 INFO L93 Difference]: Finished difference Result 62 states and 64 transitions. [2022-11-23 15:09:03,909 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-11-23 15:09:03,909 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 1.125) internal successors, (63), 56 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 57 [2022-11-23 15:09:03,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:09:03,910 INFO L225 Difference]: With dead ends: 62 [2022-11-23 15:09:03,910 INFO L226 Difference]: Without dead ends: 59 [2022-11-23 15:09:03,910 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 225 GetRequests, 96 SyntacticMatches, 51 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4380 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=1266, Invalid=5054, Unknown=0, NotChecked=0, Total=6320 [2022-11-23 15:09:03,911 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 30 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 440 mSolverCounterSat, 170 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 610 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 170 IncrementalHoareTripleChecker+Valid, 440 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-23 15:09:03,911 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [30 Valid, 13 Invalid, 610 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [170 Valid, 440 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-23 15:09:03,911 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2022-11-23 15:09:04,020 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2022-11-23 15:09:04,020 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 58 states have (on average 1.0517241379310345) internal successors, (61), 58 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:09:04,020 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 61 transitions. [2022-11-23 15:09:04,021 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 61 transitions. Word has length 57 [2022-11-23 15:09:04,021 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:09:04,021 INFO L495 AbstractCegarLoop]: Abstraction has 59 states and 61 transitions. [2022-11-23 15:09:04,021 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 56 states have (on average 1.125) internal successors, (63), 56 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) [2022-11-23 15:09:04,021 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 61 transitions. [2022-11-23 15:09:04,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-11-23 15:09:04,022 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:09:04,022 INFO L195 NwaCegarLoop]: trace histogram [17, 17, 17, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:09:04,030 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Forceful destruction successful, exit code 0 [2022-11-23 15:09:04,229 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable48 [2022-11-23 15:09:04,229 INFO L420 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:09:04,230 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:09:04,230 INFO L85 PathProgramCache]: Analyzing trace with hash 91111704, now seen corresponding path program 48 times [2022-11-23 15:09:04,230 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:09:04,230 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [917803376] [2022-11-23 15:09:04,230 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:09:04,230 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:09:04,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:09:17,632 INFO L134 CoverageAnalysis]: Checked inductivity of 459 backedges. 91 proven. 368 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 15:09:17,633 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:09:17,633 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [917803376] [2022-11-23 15:09:17,633 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [917803376] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:09:17,633 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1883790376] [2022-11-23 15:09:17,633 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 15:09:17,633 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:09:17,633 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:09:17,634 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:09:17,637 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Waiting until timeout for monitored process [2022-11-23 15:09:17,935 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 15:09:17,935 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 15:09:17,940 INFO L263 TraceCheckSpWp]: Trace formula consists of 350 conjuncts, 148 conjunts are in the unsatisfiable core [2022-11-23 15:09:17,942 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:09:18,106 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 [2022-11-23 15:09:24,664 INFO L134 CoverageAnalysis]: Checked inductivity of 459 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2022-11-23 15:09:24,665 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:09:35,097 INFO L134 CoverageAnalysis]: Checked inductivity of 459 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2022-11-23 15:09:35,097 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1883790376] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:09:35,098 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1951538052] [2022-11-23 15:09:35,098 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-23 15:09:35,099 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:09:35,099 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:09:35,099 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:09:35,099 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:09:35,149 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-23 15:09:35,150 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 26 treesize of output 46 [2022-11-23 15:09:35,201 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-23 15:09:35,201 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-23 15:09:35,216 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 31 treesize of output 33 [2022-11-23 15:09:35,260 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:09:35,262 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:09:35,274 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-23 15:09:35,274 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 250 treesize of output 247 [2022-11-23 15:09:35,316 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 [2022-11-23 15:09:35,381 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:09:36,522 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '21418#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-23 15:09:36,523 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:09:36,523 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:09:36,523 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 40, 39] total 128 [2022-11-23 15:09:36,523 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [707360232] [2022-11-23 15:09:36,523 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:09:36,524 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 128 states [2022-11-23 15:09:36,524 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:09:36,524 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 128 interpolants. [2022-11-23 15:09:36,526 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=808, Invalid=16748, Unknown=0, NotChecked=0, Total=17556 [2022-11-23 15:09:36,526 INFO L87 Difference]: Start difference. First operand 59 states and 61 transitions. Second operand has 128 states, 128 states have (on average 1.0625) internal successors, (136), 128 states have internal predecessors, (136), 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) [2022-11-23 15:09:53,538 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:09:53,538 INFO L93 Difference]: Finished difference Result 85 states and 88 transitions. [2022-11-23 15:09:53,539 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2022-11-23 15:09:53,539 INFO L78 Accepts]: Start accepts. Automaton has has 128 states, 128 states have (on average 1.0625) internal successors, (136), 128 states have internal predecessors, (136), 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 [2022-11-23 15:09:53,539 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:09:53,540 INFO L225 Difference]: With dead ends: 85 [2022-11-23 15:09:53,540 INFO L226 Difference]: Without dead ends: 82 [2022-11-23 15:09:53,541 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 269 GetRequests, 96 SyntacticMatches, 2 SemanticMatches, 171 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8391 ImplicationChecksByTransitivity, 33.2s TimeCoverageRelationStatistics Valid=1567, Invalid=28189, Unknown=0, NotChecked=0, Total=29756 [2022-11-23 15:09:53,541 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 10 mSDsluCounter, 253 mSDsCounter, 0 mSdLazyCounter, 3794 mSolverCounterSat, 95 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 258 SdHoareTripleChecker+Invalid, 3889 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 95 IncrementalHoareTripleChecker+Valid, 3794 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.1s IncrementalHoareTripleChecker+Time [2022-11-23 15:09:53,541 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 258 Invalid, 3889 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [95 Valid, 3794 Invalid, 0 Unknown, 0 Unchecked, 6.1s Time] [2022-11-23 15:09:53,542 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2022-11-23 15:09:53,638 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 61. [2022-11-23 15:09:53,638 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 60 states have (on average 1.0666666666666667) internal successors, (64), 60 states have internal predecessors, (64), 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) [2022-11-23 15:09:53,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 64 transitions. [2022-11-23 15:09:53,638 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 64 transitions. Word has length 58 [2022-11-23 15:09:53,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:09:53,638 INFO L495 AbstractCegarLoop]: Abstraction has 61 states and 64 transitions. [2022-11-23 15:09:53,639 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 128 states, 128 states have (on average 1.0625) internal successors, (136), 128 states have internal predecessors, (136), 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) [2022-11-23 15:09:53,639 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 64 transitions. [2022-11-23 15:09:53,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-11-23 15:09:53,639 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:09:53,639 INFO L195 NwaCegarLoop]: trace histogram [18, 17, 17, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:09:53,645 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Forceful destruction successful, exit code 0 [2022-11-23 15:09:53,840 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2022-11-23 15:09:53,840 INFO L420 AbstractCegarLoop]: === Iteration 51 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:09:53,840 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:09:53,840 INFO L85 PathProgramCache]: Analyzing trace with hash 1382784557, now seen corresponding path program 49 times [2022-11-23 15:09:53,840 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:09:53,840 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1672086107] [2022-11-23 15:09:53,840 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:09:53,840 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:09:53,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:09:54,559 INFO L134 CoverageAnalysis]: Checked inductivity of 477 backedges. 154 proven. 170 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2022-11-23 15:09:54,559 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:09:54,559 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1672086107] [2022-11-23 15:09:54,559 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1672086107] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:09:54,559 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1200573882] [2022-11-23 15:09:54,560 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-23 15:09:54,560 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:09:54,560 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:09:54,561 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:09:54,563 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Waiting until timeout for monitored process [2022-11-23 15:09:54,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:09:54,759 INFO L263 TraceCheckSpWp]: Trace formula consists of 355 conjuncts, 38 conjunts are in the unsatisfiable core [2022-11-23 15:09:54,760 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:09:55,487 INFO L134 CoverageAnalysis]: Checked inductivity of 477 backedges. 171 proven. 153 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2022-11-23 15:09:55,487 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:09:56,129 INFO L134 CoverageAnalysis]: Checked inductivity of 477 backedges. 171 proven. 153 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2022-11-23 15:09:56,130 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1200573882] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:09:56,130 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1004649005] [2022-11-23 15:09:56,131 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-23 15:09:56,131 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:09:56,131 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:09:56,131 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:09:56,131 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:09:56,187 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-23 15:09:56,188 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 26 treesize of output 46 [2022-11-23 15:09:56,239 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-23 15:09:56,239 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-23 15:09:56,259 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 [2022-11-23 15:09:56,300 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:09:56,302 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:09:56,314 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-23 15:09:56,315 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 250 treesize of output 247 [2022-11-23 15:09:56,355 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 [2022-11-23 15:09:56,435 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:09:57,640 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '22185#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-23 15:09:57,640 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:09:57,640 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:09:57,641 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 58 [2022-11-23 15:09:57,641 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1569976239] [2022-11-23 15:09:57,641 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:09:57,647 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2022-11-23 15:09:57,647 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:09:57,648 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2022-11-23 15:09:57,648 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=832, Invalid=3074, Unknown=0, NotChecked=0, Total=3906 [2022-11-23 15:09:57,648 INFO L87 Difference]: Start difference. First operand 61 states and 64 transitions. Second operand has 58 states, 58 states have (on average 1.1379310344827587) internal successors, (66), 58 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) [2022-11-23 15:09:58,530 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:09:58,530 INFO L93 Difference]: Finished difference Result 123 states and 129 transitions. [2022-11-23 15:09:58,531 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-11-23 15:09:58,531 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 1.1379310344827587) internal successors, (66), 58 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 59 [2022-11-23 15:09:58,532 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:09:58,532 INFO L225 Difference]: With dead ends: 123 [2022-11-23 15:09:58,532 INFO L226 Difference]: Without dead ends: 65 [2022-11-23 15:09:58,533 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 99 SyntacticMatches, 53 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3658 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=1381, Invalid=5099, Unknown=0, NotChecked=0, Total=6480 [2022-11-23 15:09:58,533 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 11 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 383 mSolverCounterSat, 329 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 712 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 329 IncrementalHoareTripleChecker+Valid, 383 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-23 15:09:58,534 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 19 Invalid, 712 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [329 Valid, 383 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-23 15:09:58,534 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2022-11-23 15:09:58,633 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 61. [2022-11-23 15:09:58,633 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 60 states have (on average 1.05) internal successors, (63), 60 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) [2022-11-23 15:09:58,633 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 63 transitions. [2022-11-23 15:09:58,633 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 63 transitions. Word has length 59 [2022-11-23 15:09:58,633 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:09:58,633 INFO L495 AbstractCegarLoop]: Abstraction has 61 states and 63 transitions. [2022-11-23 15:09:58,634 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 58 states have (on average 1.1379310344827587) internal successors, (66), 58 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) [2022-11-23 15:09:58,634 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 63 transitions. [2022-11-23 15:09:58,634 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2022-11-23 15:09:58,634 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:09:58,634 INFO L195 NwaCegarLoop]: trace histogram [18, 18, 17, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:09:58,640 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Forceful destruction successful, exit code 0 [2022-11-23 15:09:58,835 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50,50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:09:58,835 INFO L420 AbstractCegarLoop]: === Iteration 52 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:09:58,835 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:09:58,835 INFO L85 PathProgramCache]: Analyzing trace with hash 216962573, now seen corresponding path program 50 times [2022-11-23 15:09:58,835 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:09:58,835 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1528866864] [2022-11-23 15:09:58,835 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:09:58,835 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:09:58,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:09:59,642 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 136 proven. 188 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2022-11-23 15:09:59,642 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:09:59,642 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1528866864] [2022-11-23 15:09:59,642 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1528866864] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:09:59,642 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1036740440] [2022-11-23 15:09:59,643 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 15:09:59,643 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:09:59,643 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:09:59,644 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:09:59,646 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Waiting until timeout for monitored process [2022-11-23 15:10:00,233 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2022-11-23 15:10:00,233 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 15:10:00,238 INFO L263 TraceCheckSpWp]: Trace formula consists of 362 conjuncts, 38 conjunts are in the unsatisfiable core [2022-11-23 15:10:00,239 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:10:00,784 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 153 proven. 171 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2022-11-23 15:10:00,784 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:10:01,443 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 153 proven. 171 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2022-11-23 15:10:01,444 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1036740440] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:10:01,444 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [705659447] [2022-11-23 15:10:01,445 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-23 15:10:01,445 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:10:01,445 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:10:01,445 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:10:01,445 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:10:01,503 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-23 15:10:01,503 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-23 15:10:01,514 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 [2022-11-23 15:10:01,534 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 [2022-11-23 15:10:01,585 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:10:01,586 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 15:10:01,611 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-23 15:10:01,612 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 245 treesize of output 248 [2022-11-23 15:10:01,690 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 [2022-11-23 15:10:01,744 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:10:02,656 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '22991#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-23 15:10:02,656 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:10:02,656 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:10:02,656 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 59 [2022-11-23 15:10:02,656 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [87320459] [2022-11-23 15:10:02,656 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:10:02,657 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2022-11-23 15:10:02,657 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:10:02,658 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2022-11-23 15:10:02,658 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=823, Invalid=3209, Unknown=0, NotChecked=0, Total=4032 [2022-11-23 15:10:02,659 INFO L87 Difference]: Start difference. First operand 61 states and 63 transitions. Second operand has 59 states, 59 states have (on average 1.11864406779661) internal successors, (66), 59 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) [2022-11-23 15:10:03,435 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:10:03,435 INFO L93 Difference]: Finished difference Result 65 states and 67 transitions. [2022-11-23 15:10:03,436 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2022-11-23 15:10:03,436 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 1.11864406779661) internal successors, (66), 59 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 60 [2022-11-23 15:10:03,436 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:10:03,437 INFO L225 Difference]: With dead ends: 65 [2022-11-23 15:10:03,437 INFO L226 Difference]: Without dead ends: 62 [2022-11-23 15:10:03,437 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 237 GetRequests, 101 SyntacticMatches, 54 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4872 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=1401, Invalid=5571, Unknown=0, NotChecked=0, Total=6972 [2022-11-23 15:10:03,438 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 31 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 474 mSolverCounterSat, 200 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 674 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 200 IncrementalHoareTripleChecker+Valid, 474 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-23 15:10:03,438 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [31 Valid, 13 Invalid, 674 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [200 Valid, 474 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-23 15:10:03,438 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2022-11-23 15:10:03,529 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 62. [2022-11-23 15:10:03,529 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 61 states have (on average 1.0491803278688525) internal successors, (64), 61 states have internal predecessors, (64), 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) [2022-11-23 15:10:03,529 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 64 transitions. [2022-11-23 15:10:03,529 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 64 transitions. Word has length 60 [2022-11-23 15:10:03,530 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:10:03,530 INFO L495 AbstractCegarLoop]: Abstraction has 62 states and 64 transitions. [2022-11-23 15:10:03,530 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 59 states, 59 states have (on average 1.11864406779661) internal successors, (66), 59 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) [2022-11-23 15:10:03,530 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 64 transitions. [2022-11-23 15:10:03,530 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-11-23 15:10:03,530 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:10:03,530 INFO L195 NwaCegarLoop]: trace histogram [18, 18, 18, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:10:03,538 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Forceful destruction successful, exit code 0 [2022-11-23 15:10:03,738 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51,51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:10:03,738 INFO L420 AbstractCegarLoop]: === Iteration 53 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:10:03,738 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:10:03,738 INFO L85 PathProgramCache]: Analyzing trace with hash -1864250521, now seen corresponding path program 51 times [2022-11-23 15:10:03,738 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:10:03,738 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [983242600] [2022-11-23 15:10:03,739 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:10:03,739 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:10:03,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:10:21,015 INFO L134 CoverageAnalysis]: Checked inductivity of 513 backedges. 120 proven. 393 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 15:10:21,015 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:10:21,016 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [983242600] [2022-11-23 15:10:21,016 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [983242600] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:10:21,016 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1702061160] [2022-11-23 15:10:21,016 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 15:10:21,016 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:10:21,016 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:10:21,017 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:10:21,019 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Waiting until timeout for monitored process [2022-11-23 15:10:21,360 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 15:10:21,360 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 15:10:21,365 INFO L263 TraceCheckSpWp]: Trace formula consists of 367 conjuncts, 156 conjunts are in the unsatisfiable core [2022-11-23 15:10:21,370 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:10:21,515 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 [2022-11-23 15:10:29,332 INFO L134 CoverageAnalysis]: Checked inductivity of 513 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2022-11-23 15:10:29,332 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:10:41,001 INFO L134 CoverageAnalysis]: Checked inductivity of 513 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2022-11-23 15:10:41,002 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1702061160] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:10:41,002 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [512849464] [2022-11-23 15:10:41,003 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-23 15:10:41,003 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:10:41,003 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:10:41,003 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:10:41,004 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:10:41,055 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-23 15:10:41,055 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 26 treesize of output 46 [2022-11-23 15:10:41,106 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-23 15:10:41,106 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-23 15:10:41,127 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 [2022-11-23 15:10:41,168 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:10:41,173 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:10:41,185 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-23 15:10:41,185 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 250 treesize of output 247 [2022-11-23 15:10:41,228 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 [2022-11-23 15:10:41,267 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:10:42,449 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '23772#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-23 15:10:42,449 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:10:42,449 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:10:42,449 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 42, 41] total 135 [2022-11-23 15:10:42,449 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1371953996] [2022-11-23 15:10:42,449 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:10:42,450 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 135 states [2022-11-23 15:10:42,450 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:10:42,451 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 135 interpolants. [2022-11-23 15:10:42,452 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=937, Invalid=18523, Unknown=0, NotChecked=0, Total=19460 [2022-11-23 15:10:42,453 INFO L87 Difference]: Start difference. First operand 62 states and 64 transitions. Second operand has 135 states, 135 states have (on average 1.0592592592592593) internal successors, (143), 135 states have internal predecessors, (143), 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) [2022-11-23 15:11:03,946 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:11:03,946 INFO L93 Difference]: Finished difference Result 89 states and 92 transitions. [2022-11-23 15:11:03,947 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2022-11-23 15:11:03,947 INFO L78 Accepts]: Start accepts. Automaton has has 135 states, 135 states have (on average 1.0592592592592593) internal successors, (143), 135 states have internal predecessors, (143), 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 61 [2022-11-23 15:11:03,947 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:11:03,948 INFO L225 Difference]: With dead ends: 89 [2022-11-23 15:11:03,948 INFO L226 Difference]: Without dead ends: 86 [2022-11-23 15:11:03,949 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 285 GetRequests, 101 SyntacticMatches, 2 SemanticMatches, 182 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9649 ImplicationChecksByTransitivity, 40.1s TimeCoverageRelationStatistics Valid=1851, Invalid=31821, Unknown=0, NotChecked=0, Total=33672 [2022-11-23 15:11:03,950 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 17 mSDsluCounter, 278 mSDsCounter, 0 mSdLazyCounter, 4380 mSolverCounterSat, 97 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 283 SdHoareTripleChecker+Invalid, 4477 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 97 IncrementalHoareTripleChecker+Valid, 4380 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.3s IncrementalHoareTripleChecker+Time [2022-11-23 15:11:03,950 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [17 Valid, 283 Invalid, 4477 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [97 Valid, 4380 Invalid, 0 Unknown, 0 Unchecked, 7.3s Time] [2022-11-23 15:11:03,950 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2022-11-23 15:11:04,064 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 64. [2022-11-23 15:11:04,064 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 63 states have (on average 1.0634920634920635) internal successors, (67), 63 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) [2022-11-23 15:11:04,064 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 67 transitions. [2022-11-23 15:11:04,064 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 67 transitions. Word has length 61 [2022-11-23 15:11:04,064 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:11:04,065 INFO L495 AbstractCegarLoop]: Abstraction has 64 states and 67 transitions. [2022-11-23 15:11:04,065 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 135 states, 135 states have (on average 1.0592592592592593) internal successors, (143), 135 states have internal predecessors, (143), 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) [2022-11-23 15:11:04,065 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 67 transitions. [2022-11-23 15:11:04,065 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2022-11-23 15:11:04,065 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:11:04,065 INFO L195 NwaCegarLoop]: trace histogram [19, 18, 18, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:11:04,071 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Forceful destruction successful, exit code 0 [2022-11-23 15:11:04,266 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52,52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:11:04,266 INFO L420 AbstractCegarLoop]: === Iteration 54 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:11:04,266 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:11:04,266 INFO L85 PathProgramCache]: Analyzing trace with hash 600093436, now seen corresponding path program 52 times [2022-11-23 15:11:04,266 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:11:04,266 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1989427133] [2022-11-23 15:11:04,266 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:11:04,267 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:11:04,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:11:05,063 INFO L134 CoverageAnalysis]: Checked inductivity of 532 backedges. 172 proven. 189 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2022-11-23 15:11:05,063 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:11:05,064 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1989427133] [2022-11-23 15:11:05,064 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1989427133] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:11:05,064 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1189786946] [2022-11-23 15:11:05,064 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-23 15:11:05,064 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:11:05,064 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:11:05,067 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:11:05,091 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Waiting until timeout for monitored process [2022-11-23 15:11:05,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:11:05,295 INFO L263 TraceCheckSpWp]: Trace formula consists of 372 conjuncts, 40 conjunts are in the unsatisfiable core [2022-11-23 15:11:05,297 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:11:06,063 INFO L134 CoverageAnalysis]: Checked inductivity of 532 backedges. 190 proven. 171 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2022-11-23 15:11:06,063 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:11:06,655 INFO L134 CoverageAnalysis]: Checked inductivity of 532 backedges. 190 proven. 171 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2022-11-23 15:11:06,655 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1189786946] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:11:06,655 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [541975650] [2022-11-23 15:11:06,656 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-23 15:11:06,656 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:11:06,657 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:11:06,657 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:11:06,657 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:11:06,706 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-23 15:11:06,706 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 26 treesize of output 46 [2022-11-23 15:11:06,757 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-23 15:11:06,757 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-23 15:11:06,790 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 [2022-11-23 15:11:06,836 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:11:06,839 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:11:06,851 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-23 15:11:06,852 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 250 treesize of output 247 [2022-11-23 15:11:06,893 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 [2022-11-23 15:11:06,956 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:11:08,233 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '24582#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-23 15:11:08,233 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:11:08,234 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:11:08,234 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 61 [2022-11-23 15:11:08,234 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [92293762] [2022-11-23 15:11:08,234 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:11:08,235 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 61 states [2022-11-23 15:11:08,235 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:11:08,235 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2022-11-23 15:11:08,236 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=915, Invalid=3375, Unknown=0, NotChecked=0, Total=4290 [2022-11-23 15:11:08,236 INFO L87 Difference]: Start difference. First operand 64 states and 67 transitions. Second operand has 61 states, 61 states have (on average 1.1311475409836065) internal successors, (69), 61 states have internal predecessors, (69), 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) [2022-11-23 15:11:09,185 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:11:09,185 INFO L93 Difference]: Finished difference Result 129 states and 135 transitions. [2022-11-23 15:11:09,185 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2022-11-23 15:11:09,185 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 61 states have (on average 1.1311475409836065) internal successors, (69), 61 states have internal predecessors, (69), 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 62 [2022-11-23 15:11:09,186 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:11:09,186 INFO L225 Difference]: With dead ends: 129 [2022-11-23 15:11:09,186 INFO L226 Difference]: Without dead ends: 68 [2022-11-23 15:11:09,187 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 243 GetRequests, 104 SyntacticMatches, 56 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4042 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=1523, Invalid=5617, Unknown=0, NotChecked=0, Total=7140 [2022-11-23 15:11:09,188 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 19 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 357 mSolverCounterSat, 326 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 683 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 326 IncrementalHoareTripleChecker+Valid, 357 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-23 15:11:09,188 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 15 Invalid, 683 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [326 Valid, 357 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-23 15:11:09,188 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2022-11-23 15:11:09,291 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 64. [2022-11-23 15:11:09,291 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 63 states have (on average 1.0476190476190477) internal successors, (66), 63 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) [2022-11-23 15:11:09,291 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 66 transitions. [2022-11-23 15:11:09,291 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 66 transitions. Word has length 62 [2022-11-23 15:11:09,291 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:11:09,291 INFO L495 AbstractCegarLoop]: Abstraction has 64 states and 66 transitions. [2022-11-23 15:11:09,292 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 61 states, 61 states have (on average 1.1311475409836065) internal successors, (69), 61 states have internal predecessors, (69), 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) [2022-11-23 15:11:09,292 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 66 transitions. [2022-11-23 15:11:09,292 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2022-11-23 15:11:09,292 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:11:09,292 INFO L195 NwaCegarLoop]: trace histogram [19, 19, 18, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:11:09,299 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Forceful destruction successful, exit code 0 [2022-11-23 15:11:09,492 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53,53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:11:09,493 INFO L420 AbstractCegarLoop]: === Iteration 55 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:11:09,493 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:11:09,493 INFO L85 PathProgramCache]: Analyzing trace with hash -1297076452, now seen corresponding path program 53 times [2022-11-23 15:11:09,493 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:11:09,493 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1145764242] [2022-11-23 15:11:09,493 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:11:09,493 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:11:09,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:11:10,344 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 153 proven. 208 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2022-11-23 15:11:10,344 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:11:10,344 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1145764242] [2022-11-23 15:11:10,344 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1145764242] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:11:10,344 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1593929233] [2022-11-23 15:11:10,345 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 15:11:10,345 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:11:10,345 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:11:10,346 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:11:10,348 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Waiting until timeout for monitored process [2022-11-23 15:11:10,968 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2022-11-23 15:11:10,968 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 15:11:10,972 INFO L263 TraceCheckSpWp]: Trace formula consists of 379 conjuncts, 40 conjunts are in the unsatisfiable core [2022-11-23 15:11:10,973 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:11:11,562 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 171 proven. 190 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2022-11-23 15:11:11,562 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:11:12,222 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 171 proven. 190 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2022-11-23 15:11:12,222 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1593929233] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:11:12,222 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1451056731] [2022-11-23 15:11:12,223 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-23 15:11:12,223 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:11:12,223 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:11:12,223 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:11:12,223 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:11:12,276 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-23 15:11:12,276 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-23 15:11:12,287 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 [2022-11-23 15:11:12,304 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 [2022-11-23 15:11:12,348 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:11:12,350 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:11:12,362 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-23 15:11:12,363 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 250 treesize of output 247 [2022-11-23 15:11:12,404 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 [2022-11-23 15:11:12,444 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:11:12,747 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '25429#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-23 15:11:12,747 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:11:12,747 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:11:12,747 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41] total 62 [2022-11-23 15:11:12,747 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [359060160] [2022-11-23 15:11:12,747 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:11:12,748 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 62 states [2022-11-23 15:11:12,748 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:11:12,748 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2022-11-23 15:11:12,749 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=905, Invalid=3517, Unknown=0, NotChecked=0, Total=4422 [2022-11-23 15:11:12,749 INFO L87 Difference]: Start difference. First operand 64 states and 66 transitions. Second operand has 62 states, 62 states have (on average 1.1129032258064515) internal successors, (69), 62 states have internal predecessors, (69), 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) [2022-11-23 15:11:13,624 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:11:13,624 INFO L93 Difference]: Finished difference Result 68 states and 70 transitions. [2022-11-23 15:11:13,625 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2022-11-23 15:11:13,625 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 62 states have (on average 1.1129032258064515) internal successors, (69), 62 states have internal predecessors, (69), 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 63 [2022-11-23 15:11:13,625 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:11:13,625 INFO L225 Difference]: With dead ends: 68 [2022-11-23 15:11:13,625 INFO L226 Difference]: Without dead ends: 65 [2022-11-23 15:11:13,626 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 249 GetRequests, 125 SyntacticMatches, 38 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3908 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1543, Invalid=6113, Unknown=0, NotChecked=0, Total=7656 [2022-11-23 15:11:13,626 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 32 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 490 mSolverCounterSat, 217 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 707 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 217 IncrementalHoareTripleChecker+Valid, 490 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-23 15:11:13,627 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [32 Valid, 11 Invalid, 707 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [217 Valid, 490 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-23 15:11:13,627 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2022-11-23 15:11:13,729 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2022-11-23 15:11:13,730 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 64 states have (on average 1.046875) internal successors, (67), 64 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) [2022-11-23 15:11:13,730 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 67 transitions. [2022-11-23 15:11:13,730 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 67 transitions. Word has length 63 [2022-11-23 15:11:13,730 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:11:13,730 INFO L495 AbstractCegarLoop]: Abstraction has 65 states and 67 transitions. [2022-11-23 15:11:13,730 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 62 states, 62 states have (on average 1.1129032258064515) internal successors, (69), 62 states have internal predecessors, (69), 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) [2022-11-23 15:11:13,730 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 67 transitions. [2022-11-23 15:11:13,731 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-11-23 15:11:13,731 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:11:13,731 INFO L195 NwaCegarLoop]: trace histogram [19, 19, 19, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:11:13,737 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Forceful destruction successful, exit code 0 [2022-11-23 15:11:13,931 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable54 [2022-11-23 15:11:13,931 INFO L420 AbstractCegarLoop]: === Iteration 56 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:11:13,932 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:11:13,932 INFO L85 PathProgramCache]: Analyzing trace with hash -1554820040, now seen corresponding path program 54 times [2022-11-23 15:11:13,932 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:11:13,932 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1654198462] [2022-11-23 15:11:13,932 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:11:13,932 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:11:14,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:11:32,980 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 136 proven. 434 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 15:11:32,980 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:11:32,980 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1654198462] [2022-11-23 15:11:32,980 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1654198462] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:11:32,980 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [988964852] [2022-11-23 15:11:32,980 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 15:11:32,980 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:11:32,980 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:11:32,981 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:11:32,984 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5f9a2e4-4cb0-4206-8bdb-3b001a5f67a8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Waiting until timeout for monitored process [2022-11-23 15:11:33,287 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 15:11:33,287 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 15:11:33,291 INFO L263 TraceCheckSpWp]: Trace formula consists of 384 conjuncts, 162 conjunts are in the unsatisfiable core [2022-11-23 15:11:33,293 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:11:42,163 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2022-11-23 15:11:42,163 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:12:18,021 WARN L233 SmtUtils]: Spent 22.92s on a formula simplification that was a NOOP. DAG size: 1198 (called from [L 318] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.arrays.Elim1Store.elim1) [2022-11-23 15:12:18,022 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 15:12:18,023 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 38 select indices, 38 select index equivalence classes, 0 disjoint index pairs (out of 703 index pairs), introduced 38 new quantified variables, introduced 703 case distinctions, treesize of input 325 treesize of output 3996