./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 38b53e6a 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_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-crafted/zero_sum_const1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur --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-38b53e6 [2022-11-25 23:18:36,038 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-25 23:18:36,039 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-25 23:18:36,065 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-25 23:18:36,065 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-25 23:18:36,066 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-25 23:18:36,071 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-25 23:18:36,073 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-25 23:18:36,075 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-25 23:18:36,075 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-25 23:18:36,076 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-25 23:18:36,078 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-25 23:18:36,078 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-25 23:18:36,079 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-25 23:18:36,080 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-25 23:18:36,081 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-25 23:18:36,082 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-25 23:18:36,083 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-25 23:18:36,085 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-25 23:18:36,087 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-25 23:18:36,088 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-25 23:18:36,090 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-25 23:18:36,091 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-25 23:18:36,092 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-25 23:18:36,095 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-25 23:18:36,095 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-25 23:18:36,096 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-25 23:18:36,097 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-25 23:18:36,097 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-25 23:18:36,098 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-25 23:18:36,099 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-25 23:18:36,099 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-25 23:18:36,100 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-25 23:18:36,101 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-25 23:18:36,102 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-25 23:18:36,102 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-25 23:18:36,103 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-25 23:18:36,104 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-25 23:18:36,104 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-25 23:18:36,105 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-25 23:18:36,106 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-25 23:18:36,111 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-25 23:18:36,148 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-25 23:18:36,148 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-25 23:18:36,149 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-25 23:18:36,149 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-25 23:18:36,150 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-25 23:18:36,150 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-25 23:18:36,151 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-25 23:18:36,151 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-25 23:18:36,151 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-25 23:18:36,151 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-25 23:18:36,152 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-25 23:18:36,152 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-25 23:18:36,153 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-25 23:18:36,153 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-25 23:18:36,153 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-25 23:18:36,153 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-25 23:18:36,153 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-25 23:18:36,154 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-25 23:18:36,154 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-25 23:18:36,154 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-25 23:18:36,155 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-25 23:18:36,155 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-25 23:18:36,155 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-25 23:18:36,155 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-25 23:18:36,155 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-25 23:18:36,155 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-25 23:18:36,156 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-25 23:18:36,156 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-25 23:18:36,156 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-25 23:18:36,156 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-25 23:18:36,157 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-25 23:18:36,157 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-25 23:18:36,157 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-25 23:18:36,157 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-25 23:18:36,157 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-25 23:18:36,158 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-25 23:18:36,158 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-25 23:18:36,158 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-25 23:18:36,158 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-25 23:18:36,158 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-25 23:18:36,159 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-25 23:18:36,159 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_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> be1a0182ecf6c8aa754e6086345670fff3439e7c706169309311fcaa402caa1e [2022-11-25 23:18:36,401 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-25 23:18:36,422 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-25 23:18:36,438 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-25 23:18:36,440 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-25 23:18:36,440 INFO L275 PluginConnector]: CDTParser initialized [2022-11-25 23:18:36,442 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/../../sv-benchmarks/c/array-crafted/zero_sum_const1.c [2022-11-25 23:18:39,530 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-25 23:18:39,743 INFO L351 CDTParser]: Found 1 translation units. [2022-11-25 23:18:39,743 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/sv-benchmarks/c/array-crafted/zero_sum_const1.c [2022-11-25 23:18:39,749 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/data/3768b0fa1/e96d2777a0a046689c51293b1c517a09/FLAGf850ee552 [2022-11-25 23:18:39,764 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/data/3768b0fa1/e96d2777a0a046689c51293b1c517a09 [2022-11-25 23:18:39,767 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-25 23:18:39,768 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-25 23:18:39,770 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-25 23:18:39,770 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-25 23:18:39,774 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-25 23:18:39,774 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 11:18:39" (1/1) ... [2022-11-25 23:18:39,776 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2445b948 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:18:39, skipping insertion in model container [2022-11-25 23:18:39,776 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 11:18:39" (1/1) ... [2022-11-25 23:18:39,783 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-25 23:18:39,799 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-25 23:18:39,948 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_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/sv-benchmarks/c/array-crafted/zero_sum_const1.c[406,419] [2022-11-25 23:18:39,971 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-25 23:18:39,978 INFO L203 MainTranslator]: Completed pre-run [2022-11-25 23:18:39,988 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_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/sv-benchmarks/c/array-crafted/zero_sum_const1.c[406,419] [2022-11-25 23:18:39,993 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-25 23:18:40,006 INFO L208 MainTranslator]: Completed translation [2022-11-25 23:18:40,007 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:18:40 WrapperNode [2022-11-25 23:18:40,007 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-25 23:18:40,008 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-25 23:18:40,008 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-25 23:18:40,008 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-25 23:18:40,014 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:18:40" (1/1) ... [2022-11-25 23:18:40,021 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:18:40" (1/1) ... [2022-11-25 23:18:40,038 INFO L138 Inliner]: procedures = 16, calls = 12, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 60 [2022-11-25 23:18:40,039 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-25 23:18:40,039 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-25 23:18:40,039 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-25 23:18:40,039 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-25 23:18:40,048 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:18:40" (1/1) ... [2022-11-25 23:18:40,048 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:18:40" (1/1) ... [2022-11-25 23:18:40,050 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:18:40" (1/1) ... [2022-11-25 23:18:40,050 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:18:40" (1/1) ... [2022-11-25 23:18:40,054 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:18:40" (1/1) ... [2022-11-25 23:18:40,058 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:18:40" (1/1) ... [2022-11-25 23:18:40,059 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:18:40" (1/1) ... [2022-11-25 23:18:40,062 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:18:40" (1/1) ... [2022-11-25 23:18:40,068 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-25 23:18:40,069 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-25 23:18:40,076 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-25 23:18:40,077 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-25 23:18:40,077 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:18:40" (1/1) ... [2022-11-25 23:18:40,084 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-25 23:18:40,093 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:18:40,105 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-25 23:18:40,111 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-25 23:18:40,144 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-25 23:18:40,144 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-25 23:18:40,144 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-11-25 23:18:40,144 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2022-11-25 23:18:40,144 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-25 23:18:40,145 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-25 23:18:40,145 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-11-25 23:18:40,215 INFO L235 CfgBuilder]: Building ICFG [2022-11-25 23:18:40,217 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-25 23:18:40,356 INFO L276 CfgBuilder]: Performing block encoding [2022-11-25 23:18:40,388 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-25 23:18:40,389 INFO L300 CfgBuilder]: Removed 3 assume(true) statements. [2022-11-25 23:18:40,391 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 11:18:40 BoogieIcfgContainer [2022-11-25 23:18:40,391 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-25 23:18:40,394 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-25 23:18:40,394 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-25 23:18:40,398 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-25 23:18:40,398 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 11:18:39" (1/3) ... [2022-11-25 23:18:40,399 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6319612b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 11:18:40, skipping insertion in model container [2022-11-25 23:18:40,399 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:18:40" (2/3) ... [2022-11-25 23:18:40,399 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6319612b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 11:18:40, skipping insertion in model container [2022-11-25 23:18:40,400 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 11:18:40" (3/3) ... [2022-11-25 23:18:40,401 INFO L112 eAbstractionObserver]: Analyzing ICFG zero_sum_const1.c [2022-11-25 23:18:40,420 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-25 23:18:40,421 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-25 23:18:40,505 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-25 23:18:40,512 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;@558416b8, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-25 23:18:40,512 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-25 23:18:40,526 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) [2022-11-25 23:18:40,531 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-11-25 23:18:40,532 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:18:40,532 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:18:40,533 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:18:40,561 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:18:40,562 INFO L85 PathProgramCache]: Analyzing trace with hash -1231969017, now seen corresponding path program 1 times [2022-11-25 23:18:40,570 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:18:40,571 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2115133708] [2022-11-25 23:18:40,571 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:18:40,571 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:18:40,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:18:40,803 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:18:40,804 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:18:40,804 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2115133708] [2022-11-25 23:18:40,805 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2115133708] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 23:18:40,805 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 23:18:40,806 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-25 23:18:40,807 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1317249495] [2022-11-25 23:18:40,808 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 23:18:40,812 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-25 23:18:40,813 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:18:40,848 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-25 23:18:40,849 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-25 23:18:40,864 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) [2022-11-25 23:18:40,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:18:40,908 INFO L93 Difference]: Finished difference Result 20 states and 27 transitions. [2022-11-25 23:18:40,910 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-25 23:18:40,911 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 [2022-11-25 23:18:40,911 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:18:40,919 INFO L225 Difference]: With dead ends: 20 [2022-11-25 23:18:40,919 INFO L226 Difference]: Without dead ends: 9 [2022-11-25 23:18:40,922 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 [2022-11-25 23:18:40,926 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 0 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s 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, 0.0s IncrementalHoareTripleChecker+Time [2022-11-25 23:18:40,927 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 10 Invalid, 17 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-25 23:18:40,944 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2022-11-25 23:18:40,954 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2022-11-25 23:18:40,963 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) [2022-11-25 23:18:40,964 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 11 transitions. [2022-11-25 23:18:40,965 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 11 transitions. Word has length 7 [2022-11-25 23:18:40,966 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:18:40,966 INFO L495 AbstractCegarLoop]: Abstraction has 9 states and 11 transitions. [2022-11-25 23:18:40,966 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) [2022-11-25 23:18:40,967 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 11 transitions. [2022-11-25 23:18:40,967 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-11-25 23:18:40,982 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:18:40,983 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:18:40,983 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-25 23:18:40,983 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:18:40,984 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:18:40,984 INFO L85 PathProgramCache]: Analyzing trace with hash 288279783, now seen corresponding path program 1 times [2022-11-25 23:18:40,985 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:18:40,985 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1086307202] [2022-11-25 23:18:40,985 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:18:40,985 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:18:41,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:18:41,133 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-25 23:18:41,133 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:18:41,134 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1086307202] [2022-11-25 23:18:41,134 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1086307202] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 23:18:41,134 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 23:18:41,134 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-25 23:18:41,135 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1682304683] [2022-11-25 23:18:41,135 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 23:18:41,136 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-25 23:18:41,137 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:18:41,137 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-25 23:18:41,138 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-25 23:18:41,138 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) [2022-11-25 23:18:41,167 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:18:41,167 INFO L93 Difference]: Finished difference Result 15 states and 19 transitions. [2022-11-25 23:18:41,168 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-25 23:18:41,168 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 [2022-11-25 23:18:41,168 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:18:41,168 INFO L225 Difference]: With dead ends: 15 [2022-11-25 23:18:41,169 INFO L226 Difference]: Without dead ends: 11 [2022-11-25 23:18:41,169 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 [2022-11-25 23:18:41,171 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 8 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 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 [2022-11-25 23:18:41,172 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 5 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-25 23:18:41,173 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2022-11-25 23:18:41,175 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2022-11-25 23:18:41,176 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) [2022-11-25 23:18:41,176 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 13 transitions. [2022-11-25 23:18:41,177 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 13 transitions. Word has length 8 [2022-11-25 23:18:41,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:18:41,177 INFO L495 AbstractCegarLoop]: Abstraction has 11 states and 13 transitions. [2022-11-25 23:18:41,177 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) [2022-11-25 23:18:41,178 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 13 transitions. [2022-11-25 23:18:41,178 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-11-25 23:18:41,178 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:18:41,178 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:18:41,179 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-25 23:18:41,179 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:18:41,180 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:18:41,180 INFO L85 PathProgramCache]: Analyzing trace with hash 1903708184, now seen corresponding path program 1 times [2022-11-25 23:18:41,180 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:18:41,181 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2008347092] [2022-11-25 23:18:41,181 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:18:41,181 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:18:41,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:18:41,368 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-25 23:18:41,382 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:18:41,382 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2008347092] [2022-11-25 23:18:41,383 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2008347092] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:18:41,383 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [203226932] [2022-11-25 23:18:41,383 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:18:41,383 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:18:41,384 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:18:41,389 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:18:41,394 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-25 23:18:41,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:18:41,500 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-25 23:18:41,515 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:18:41,617 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-25 23:18:41,619 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:18:41,661 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-25 23:18:41,662 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [203226932] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:18:41,663 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1997617625] [2022-11-25 23:18:41,695 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-25 23:18:41,696 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:18:41,705 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:18:41,710 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:18:41,711 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:18:41,875 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-25 23:18:41,878 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 [2022-11-25 23:18:41,922 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 [2022-11-25 23:18:41,989 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 [2022-11-25 23:18:42,154 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:42,157 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:18:42,186 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-25 23:18:42,187 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 [2022-11-25 23:18:42,416 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 [2022-11-25 23:18:42,587 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:18:42,903 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 [2022-11-25 23:18:42,904 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:18:42,904 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:18:42,904 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2022-11-25 23:18:42,906 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [481959100] [2022-11-25 23:18:42,907 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:18:42,908 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-25 23:18:42,908 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:18:42,911 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-25 23:18:42,912 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2022-11-25 23:18:42,913 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) [2022-11-25 23:18:42,964 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:18:42,964 INFO L93 Difference]: Finished difference Result 19 states and 23 transitions. [2022-11-25 23:18:42,965 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-25 23:18:42,965 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 [2022-11-25 23:18:42,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:18:42,968 INFO L225 Difference]: With dead ends: 19 [2022-11-25 23:18:42,968 INFO L226 Difference]: Without dead ends: 12 [2022-11-25 23:18:42,970 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 19 SyntacticMatches, 3 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2022-11-25 23:18:42,973 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 29 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-25 23:18:42,981 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 9 Invalid, 29 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-25 23:18:42,983 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2022-11-25 23:18:42,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2022-11-25 23:18:42,985 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) [2022-11-25 23:18:42,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 14 transitions. [2022-11-25 23:18:42,985 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 14 transitions. Word has length 10 [2022-11-25 23:18:42,986 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:18:42,986 INFO L495 AbstractCegarLoop]: Abstraction has 12 states and 14 transitions. [2022-11-25 23:18:42,986 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) [2022-11-25 23:18:42,986 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 14 transitions. [2022-11-25 23:18:42,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-11-25 23:18:42,987 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:18:42,987 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:18:42,999 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-25 23:18:43,187 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2022-11-25 23:18:43,188 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:18:43,189 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:18:43,189 INFO L85 PathProgramCache]: Analyzing trace with hash 1205572664, now seen corresponding path program 2 times [2022-11-25 23:18:43,189 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:18:43,189 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1572310799] [2022-11-25 23:18:43,189 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:18:43,190 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:18:43,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:18:43,325 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-25 23:18:43,325 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:18:43,326 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1572310799] [2022-11-25 23:18:43,327 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1572310799] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:18:43,327 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2064036598] [2022-11-25 23:18:43,327 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:18:43,327 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:18:43,327 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:18:43,331 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:18:43,341 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-25 23:18:43,411 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-25 23:18:43,411 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:18:43,413 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-25 23:18:43,414 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:18:43,457 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-25 23:18:43,458 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:18:43,489 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-25 23:18:43,489 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2064036598] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:18:43,489 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1792714931] [2022-11-25 23:18:43,494 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-25 23:18:43,494 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:18:43,494 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:18:43,495 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:18:43,495 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:18:43,614 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-25 23:18:43,615 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 [2022-11-25 23:18:43,645 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 [2022-11-25 23:18:43,684 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 [2022-11-25 23:18:43,778 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:43,779 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:18:43,811 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-25 23:18:43,811 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 [2022-11-25 23:18:43,905 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 [2022-11-25 23:18:44,043 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:18:44,315 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 [2022-11-25 23:18:44,315 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:18:44,315 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:18:44,316 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2022-11-25 23:18:44,316 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [768826153] [2022-11-25 23:18:44,316 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:18:44,316 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-25 23:18:44,317 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:18:44,317 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-25 23:18:44,317 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=117, Unknown=0, NotChecked=0, Total=156 [2022-11-25 23:18:44,318 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) [2022-11-25 23:18:44,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:18:44,360 INFO L93 Difference]: Finished difference Result 19 states and 23 transitions. [2022-11-25 23:18:44,361 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-25 23:18:44,361 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 [2022-11-25 23:18:44,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:18:44,361 INFO L225 Difference]: With dead ends: 19 [2022-11-25 23:18:44,361 INFO L226 Difference]: Without dead ends: 14 [2022-11-25 23:18:44,362 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 [2022-11-25 23:18:44,363 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 7 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 5 SdHoareTripleChecker+Invalid, 31 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-25 23:18:44,363 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 5 Invalid, 31 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-25 23:18:44,364 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2022-11-25 23:18:44,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2022-11-25 23:18:44,366 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) [2022-11-25 23:18:44,367 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2022-11-25 23:18:44,367 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 11 [2022-11-25 23:18:44,367 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:18:44,367 INFO L495 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2022-11-25 23:18:44,367 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) [2022-11-25 23:18:44,368 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2022-11-25 23:18:44,368 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-25 23:18:44,368 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:18:44,368 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:18:44,378 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-25 23:18:44,569 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:18:44,569 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:18:44,570 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:18:44,570 INFO L85 PathProgramCache]: Analyzing trace with hash -259387289, now seen corresponding path program 3 times [2022-11-25 23:18:44,570 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:18:44,570 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1633997553] [2022-11-25 23:18:44,570 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:18:44,570 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:18:44,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:18:45,355 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:18:45,356 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:18:45,356 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1633997553] [2022-11-25 23:18:45,356 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1633997553] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:18:45,356 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [217679925] [2022-11-25 23:18:45,357 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 23:18:45,357 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:18:45,357 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:18:45,358 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:18:45,378 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-25 23:18:45,425 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 23:18:45,425 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:18:45,427 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 32 conjunts are in the unsatisfiable core [2022-11-25 23:18:45,429 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:18:45,687 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-25 23:18:45,688 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:18:45,938 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-25 23:18:45,939 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 [2022-11-25 23:18:46,018 INFO L321 Elim1Store]: treesize reduction 34, result has 20.9 percent of original size [2022-11-25 23:18:46,019 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 [2022-11-25 23:18:46,131 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-25 23:18:46,132 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [217679925] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:18:46,132 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1319471824] [2022-11-25 23:18:46,134 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-25 23:18:46,134 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:18:46,135 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:18:46,135 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:18:46,135 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:18:46,199 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-25 23:18:46,199 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 [2022-11-25 23:18:46,277 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-25 23:18:46,277 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 [2022-11-25 23:18:46,311 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 [2022-11-25 23:18:46,385 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:46,389 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:46,402 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-25 23:18:46,402 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 [2022-11-25 23:18:46,466 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 [2022-11-25 23:18:46,537 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:18:46,846 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 [2022-11-25 23:18:46,846 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:18:46,846 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:18:46,847 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11, 10] total 25 [2022-11-25 23:18:46,847 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [781194337] [2022-11-25 23:18:46,847 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:18:46,847 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-11-25 23:18:46,847 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:18:46,848 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-11-25 23:18:46,849 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=763, Unknown=0, NotChecked=0, Total=870 [2022-11-25 23:18:46,849 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) [2022-11-25 23:18:47,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:18:47,512 INFO L93 Difference]: Finished difference Result 21 states and 24 transitions. [2022-11-25 23:18:47,512 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-25 23:18:47,513 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 [2022-11-25 23:18:47,513 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:18:47,513 INFO L225 Difference]: With dead ends: 21 [2022-11-25 23:18:47,513 INFO L226 Difference]: Without dead ends: 18 [2022-11-25 23:18:47,514 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 19 SyntacticMatches, 2 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 285 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=180, Invalid=1302, Unknown=0, NotChecked=0, Total=1482 [2022-11-25 23:18:47,515 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 7 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 200 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 214 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 200 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-25 23:18:47,515 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 27 Invalid, 214 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 200 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-25 23:18:47,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2022-11-25 23:18:47,520 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 16. [2022-11-25 23:18:47,520 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) [2022-11-25 23:18:47,520 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 19 transitions. [2022-11-25 23:18:47,521 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 19 transitions. Word has length 13 [2022-11-25 23:18:47,521 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:18:47,521 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 19 transitions. [2022-11-25 23:18:47,521 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) [2022-11-25 23:18:47,521 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 19 transitions. [2022-11-25 23:18:47,522 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-11-25 23:18:47,522 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:18:47,522 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:18:47,532 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-25 23:18:47,727 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:18:47,727 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:18:47,727 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:18:47,727 INFO L85 PathProgramCache]: Analyzing trace with hash 1380207612, now seen corresponding path program 4 times [2022-11-25 23:18:47,727 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:18:47,728 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [592264151] [2022-11-25 23:18:47,728 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:18:47,728 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:18:47,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:18:47,820 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-25 23:18:47,821 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:18:47,821 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [592264151] [2022-11-25 23:18:47,822 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [592264151] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:18:47,822 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [331089337] [2022-11-25 23:18:47,822 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 23:18:47,822 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:18:47,822 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:18:47,827 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:18:47,850 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-25 23:18:47,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:18:47,888 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-25 23:18:47,889 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:18:47,945 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-25 23:18:47,945 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:18:47,994 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-25 23:18:47,994 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [331089337] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:18:47,995 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1656318617] [2022-11-25 23:18:47,998 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-25 23:18:47,998 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:18:47,999 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:18:47,999 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:18:47,999 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:18:48,058 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-25 23:18:48,059 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 [2022-11-25 23:18:48,117 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-25 23:18:48,118 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 [2022-11-25 23:18:48,142 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 [2022-11-25 23:18:48,212 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:48,213 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:18:48,237 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-25 23:18:48,237 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 [2022-11-25 23:18:48,332 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 [2022-11-25 23:18:48,389 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:18:48,594 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 [2022-11-25 23:18:48,594 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:18:48,594 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:18:48,595 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 13 [2022-11-25 23:18:48,595 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [194994682] [2022-11-25 23:18:48,595 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:18:48,595 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-11-25 23:18:48,595 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:18:48,596 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-11-25 23:18:48,596 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=239, Unknown=0, NotChecked=0, Total=306 [2022-11-25 23:18:48,596 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) [2022-11-25 23:18:48,686 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:18:48,686 INFO L93 Difference]: Finished difference Result 33 states and 39 transitions. [2022-11-25 23:18:48,686 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-11-25 23:18:48,687 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 [2022-11-25 23:18:48,687 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:18:48,687 INFO L225 Difference]: With dead ends: 33 [2022-11-25 23:18:48,687 INFO L226 Difference]: Without dead ends: 20 [2022-11-25 23:18:48,688 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 27 SyntacticMatches, 5 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 145 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=91, Invalid=329, Unknown=0, NotChecked=0, Total=420 [2022-11-25 23:18:48,688 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 11 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 46 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 76 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 46 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-25 23:18:48,689 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 13 Invalid, 76 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 46 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-25 23:18:48,689 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2022-11-25 23:18:48,693 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 16. [2022-11-25 23:18:48,693 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) [2022-11-25 23:18:48,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2022-11-25 23:18:48,694 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 14 [2022-11-25 23:18:48,694 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:18:48,694 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2022-11-25 23:18:48,694 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) [2022-11-25 23:18:48,694 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2022-11-25 23:18:48,695 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-11-25 23:18:48,695 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:18:48,695 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:18:48,703 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-25 23:18:48,900 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:18:48,901 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:18:48,901 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:18:48,901 INFO L85 PathProgramCache]: Analyzing trace with hash 1877248028, now seen corresponding path program 5 times [2022-11-25 23:18:48,901 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:18:48,901 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [233353646] [2022-11-25 23:18:48,901 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:18:48,901 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:18:48,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:18:49,031 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-25 23:18:49,032 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:18:49,032 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [233353646] [2022-11-25 23:18:49,032 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [233353646] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:18:49,033 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [122203937] [2022-11-25 23:18:49,033 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:18:49,033 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:18:49,033 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:18:49,035 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:18:49,043 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-25 23:18:49,100 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-25 23:18:49,100 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:18:49,101 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-25 23:18:49,103 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:18:49,179 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-25 23:18:49,179 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:18:49,244 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-25 23:18:49,245 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [122203937] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:18:49,245 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1512297181] [2022-11-25 23:18:49,247 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-25 23:18:49,247 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:18:49,248 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:18:49,248 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:18:49,248 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:18:49,304 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-25 23:18:49,305 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 [2022-11-25 23:18:49,380 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-25 23:18:49,380 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 [2022-11-25 23:18:49,406 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 [2022-11-25 23:18:49,459 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:49,459 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:18:49,482 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-25 23:18:49,483 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 [2022-11-25 23:18:49,573 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 [2022-11-25 23:18:49,637 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:18:49,830 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 [2022-11-25 23:18:49,830 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:18:49,830 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:18:49,830 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2022-11-25 23:18:49,831 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [946607575] [2022-11-25 23:18:49,831 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:18:49,831 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-25 23:18:49,831 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:18:49,832 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-25 23:18:49,832 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=269, Unknown=0, NotChecked=0, Total=342 [2022-11-25 23:18:49,832 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) [2022-11-25 23:18:49,956 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:18:49,957 INFO L93 Difference]: Finished difference Result 20 states and 22 transitions. [2022-11-25 23:18:49,957 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-25 23:18:49,957 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 [2022-11-25 23:18:49,958 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:18:49,958 INFO L225 Difference]: With dead ends: 20 [2022-11-25 23:18:49,958 INFO L226 Difference]: Without dead ends: 17 [2022-11-25 23:18:49,958 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 [2022-11-25 23:18:49,959 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 11 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 7 SdHoareTripleChecker+Invalid, 86 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:18:49,959 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 7 Invalid, 86 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 56 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 23:18:49,960 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2022-11-25 23:18:49,964 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2022-11-25 23:18:49,964 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) [2022-11-25 23:18:49,965 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2022-11-25 23:18:49,965 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 15 [2022-11-25 23:18:49,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:18:49,965 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2022-11-25 23:18:49,965 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) [2022-11-25 23:18:49,966 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2022-11-25 23:18:49,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-11-25 23:18:49,966 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:18:49,968 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:18:49,978 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-25 23:18:50,168 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:18:50,169 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:18:50,169 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:18:50,169 INFO L85 PathProgramCache]: Analyzing trace with hash -1935008968, now seen corresponding path program 6 times [2022-11-25 23:18:50,169 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:18:50,170 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [581004387] [2022-11-25 23:18:50,170 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:18:50,170 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:18:50,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:18:51,094 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:18:51,094 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:18:51,094 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [581004387] [2022-11-25 23:18:51,094 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [581004387] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:18:51,094 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2112542762] [2022-11-25 23:18:51,095 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 23:18:51,095 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:18:51,095 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:18:51,103 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:18:51,110 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-25 23:18:51,170 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 23:18:51,170 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:18:51,172 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 40 conjunts are in the unsatisfiable core [2022-11-25 23:18:51,173 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:18:51,509 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 3 proven. 12 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-25 23:18:51,510 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:18:51,927 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-25 23:18:51,927 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 [2022-11-25 23:18:52,186 INFO L321 Elim1Store]: treesize reduction 84, result has 13.4 percent of original size [2022-11-25 23:18:52,190 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 [2022-11-25 23:18:52,316 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-25 23:18:52,317 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2112542762] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:18:52,317 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1372367003] [2022-11-25 23:18:52,319 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-25 23:18:52,320 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:18:52,320 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:18:52,320 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:18:52,321 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:18:52,384 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-25 23:18:52,384 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 [2022-11-25 23:18:52,402 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 [2022-11-25 23:18:52,427 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 [2022-11-25 23:18:52,485 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:52,488 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:52,500 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-25 23:18:52,500 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 [2022-11-25 23:18:52,568 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 [2022-11-25 23:18:52,631 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:18:52,968 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 [2022-11-25 23:18:52,968 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:18:52,968 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:18:52,968 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13, 12] total 32 [2022-11-25 23:18:52,969 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1710591447] [2022-11-25 23:18:52,969 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:18:52,969 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-11-25 23:18:52,969 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:18:52,970 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-11-25 23:18:52,970 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=1189, Unknown=0, NotChecked=0, Total=1332 [2022-11-25 23:18:52,971 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) [2022-11-25 23:18:53,995 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:18:53,995 INFO L93 Difference]: Finished difference Result 25 states and 28 transitions. [2022-11-25 23:18:53,997 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-11-25 23:18:53,997 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 [2022-11-25 23:18:53,997 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:18:53,998 INFO L225 Difference]: With dead ends: 25 [2022-11-25 23:18:53,998 INFO L226 Difference]: Without dead ends: 22 [2022-11-25 23:18:53,999 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 24 SyntacticMatches, 2 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 452 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=252, Invalid=2100, Unknown=0, NotChecked=0, Total=2352 [2022-11-25 23:18:54,000 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 9 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 302 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 321 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 302 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-25 23:18:54,000 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 33 Invalid, 321 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 302 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-25 23:18:54,000 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2022-11-25 23:18:54,006 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 19. [2022-11-25 23:18:54,006 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) [2022-11-25 23:18:54,006 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 22 transitions. [2022-11-25 23:18:54,007 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 22 transitions. Word has length 16 [2022-11-25 23:18:54,007 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:18:54,007 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 22 transitions. [2022-11-25 23:18:54,007 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) [2022-11-25 23:18:54,007 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 22 transitions. [2022-11-25 23:18:54,007 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-11-25 23:18:54,008 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:18:54,008 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:18:54,012 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-25 23:18:54,210 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:18:54,211 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:18:54,211 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:18:54,211 INFO L85 PathProgramCache]: Analyzing trace with hash 148779469, now seen corresponding path program 7 times [2022-11-25 23:18:54,211 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:18:54,211 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1325545422] [2022-11-25 23:18:54,212 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:18:54,212 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:18:54,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:18:54,320 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 7 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-25 23:18:54,320 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:18:54,320 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1325545422] [2022-11-25 23:18:54,320 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1325545422] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:18:54,320 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [985035215] [2022-11-25 23:18:54,320 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 23:18:54,320 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:18:54,321 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:18:54,322 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:18:54,342 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-25 23:18:54,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:18:54,386 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-25 23:18:54,388 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:18:54,469 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-25 23:18:54,469 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:18:54,530 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-25 23:18:54,531 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [985035215] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:18:54,531 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [4600583] [2022-11-25 23:18:54,537 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-25 23:18:54,537 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:18:54,538 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:18:54,538 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:18:54,539 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:18:54,601 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-25 23:18:54,601 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 [2022-11-25 23:18:54,658 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-25 23:18:54,658 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 [2022-11-25 23:18:54,691 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 [2022-11-25 23:18:54,742 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:54,743 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:18:54,765 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-25 23:18:54,766 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 [2022-11-25 23:18:54,848 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-25 23:18:54,908 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:18:55,099 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 [2022-11-25 23:18:55,099 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:18:55,099 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:18:55,099 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 16 [2022-11-25 23:18:55,099 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1696366802] [2022-11-25 23:18:55,100 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:18:55,100 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-11-25 23:18:55,100 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:18:55,101 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-11-25 23:18:55,101 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=330, Unknown=0, NotChecked=0, Total=420 [2022-11-25 23:18:55,101 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) [2022-11-25 23:18:55,229 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:18:55,229 INFO L93 Difference]: Finished difference Result 39 states and 45 transitions. [2022-11-25 23:18:55,230 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-25 23:18:55,230 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 [2022-11-25 23:18:55,230 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:18:55,231 INFO L225 Difference]: With dead ends: 39 [2022-11-25 23:18:55,231 INFO L226 Difference]: Without dead ends: 23 [2022-11-25 23:18:55,233 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 33 SyntacticMatches, 7 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 221 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=128, Invalid=472, Unknown=0, NotChecked=0, Total=600 [2022-11-25 23:18:55,233 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 11 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 75 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 112 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 75 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:18:55,234 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 13 Invalid, 112 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 75 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 23:18:55,234 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2022-11-25 23:18:55,239 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 19. [2022-11-25 23:18:55,239 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) [2022-11-25 23:18:55,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2022-11-25 23:18:55,240 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 17 [2022-11-25 23:18:55,240 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:18:55,240 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2022-11-25 23:18:55,240 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) [2022-11-25 23:18:55,240 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2022-11-25 23:18:55,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-11-25 23:18:55,241 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:18:55,241 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:18:55,247 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2022-11-25 23:18:55,447 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2022-11-25 23:18:55,447 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:18:55,447 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:18:55,447 INFO L85 PathProgramCache]: Analyzing trace with hash -1567424083, now seen corresponding path program 8 times [2022-11-25 23:18:55,448 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:18:55,448 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1292904922] [2022-11-25 23:18:55,448 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:18:55,448 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:18:55,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:18:55,602 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 3 proven. 13 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-25 23:18:55,603 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:18:55,603 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1292904922] [2022-11-25 23:18:55,603 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1292904922] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:18:55,603 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [826326272] [2022-11-25 23:18:55,603 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:18:55,603 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:18:55,603 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:18:55,604 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:18:55,626 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-25 23:18:55,678 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-25 23:18:55,678 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:18:55,679 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-25 23:18:55,680 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:18:55,759 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-25 23:18:55,760 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:18:55,845 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-25 23:18:55,845 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [826326272] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:18:55,846 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [5941993] [2022-11-25 23:18:55,847 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-25 23:18:55,847 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:18:55,847 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:18:55,848 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:18:55,848 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:18:55,900 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-25 23:18:55,900 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 [2022-11-25 23:18:55,955 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-25 23:18:55,955 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 [2022-11-25 23:18:55,975 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 [2022-11-25 23:18:56,051 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:56,052 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:18:56,073 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-25 23:18:56,073 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 [2022-11-25 23:18:56,154 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 [2022-11-25 23:18:56,218 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:18:56,493 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 [2022-11-25 23:18:56,493 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:18:56,493 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:18:56,493 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 17 [2022-11-25 23:18:56,493 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [407953424] [2022-11-25 23:18:56,494 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:18:56,494 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-11-25 23:18:56,494 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:18:56,495 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-11-25 23:18:56,495 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=367, Unknown=0, NotChecked=0, Total=462 [2022-11-25 23:18:56,495 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) [2022-11-25 23:18:56,661 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:18:56,662 INFO L93 Difference]: Finished difference Result 23 states and 25 transitions. [2022-11-25 23:18:56,662 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-25 23:18:56,662 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 [2022-11-25 23:18:56,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:18:56,663 INFO L225 Difference]: With dead ends: 23 [2022-11-25 23:18:56,663 INFO L226 Difference]: Without dead ends: 20 [2022-11-25 23:18:56,664 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 [2022-11-25 23:18:56,664 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 11 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 120 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 146 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 120 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:18:56,665 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 15 Invalid, 146 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 120 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 23:18:56,665 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2022-11-25 23:18:56,671 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2022-11-25 23:18:56,671 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) [2022-11-25 23:18:56,671 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2022-11-25 23:18:56,672 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 18 [2022-11-25 23:18:56,672 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:18:56,672 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2022-11-25 23:18:56,672 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) [2022-11-25 23:18:56,672 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2022-11-25 23:18:56,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-11-25 23:18:56,673 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:18:56,673 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:18:56,679 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2022-11-25 23:18:56,874 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:18:56,875 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:18:56,875 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:18:56,875 INFO L85 PathProgramCache]: Analyzing trace with hash -1345662009, now seen corresponding path program 9 times [2022-11-25 23:18:56,875 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:18:56,876 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [382800549] [2022-11-25 23:18:56,876 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:18:56,876 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:18:56,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:18:58,364 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:18:58,364 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:18:58,364 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [382800549] [2022-11-25 23:18:58,364 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [382800549] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:18:58,364 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [939759667] [2022-11-25 23:18:58,364 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 23:18:58,364 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:18:58,365 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:18:58,367 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:18:58,390 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-25 23:18:58,441 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 23:18:58,441 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:18:58,443 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 49 conjunts are in the unsatisfiable core [2022-11-25 23:18:58,445 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:18:58,961 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 4 proven. 20 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-25 23:18:58,962 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:18:59,640 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-25 23:18:59,641 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 [2022-11-25 23:19:00,162 INFO L321 Elim1Store]: treesize reduction 156, result has 9.8 percent of original size [2022-11-25 23:19:00,162 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 [2022-11-25 23:19:00,321 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-25 23:19:00,322 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [939759667] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:19:00,322 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [323209650] [2022-11-25 23:19:00,323 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-25 23:19:00,323 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:19:00,324 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:19:00,324 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:19:00,324 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:19:00,386 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-25 23:19:00,387 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 [2022-11-25 23:19:00,401 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 [2022-11-25 23:19:00,421 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 [2022-11-25 23:19:00,474 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:00,476 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:00,487 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-25 23:19:00,488 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 [2022-11-25 23:19:00,533 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 [2022-11-25 23:19:00,580 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:19:00,966 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 [2022-11-25 23:19:00,966 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:19:00,966 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:19:00,966 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 15, 14] total 39 [2022-11-25 23:19:00,966 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [120439621] [2022-11-25 23:19:00,967 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:19:00,967 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2022-11-25 23:19:00,967 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:19:00,968 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2022-11-25 23:19:00,969 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=179, Invalid=1713, Unknown=0, NotChecked=0, Total=1892 [2022-11-25 23:19:00,969 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) [2022-11-25 23:19:02,708 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:19:02,709 INFO L93 Difference]: Finished difference Result 31 states and 35 transitions. [2022-11-25 23:19:02,709 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-11-25 23:19:02,709 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 [2022-11-25 23:19:02,710 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:19:02,710 INFO L225 Difference]: With dead ends: 31 [2022-11-25 23:19:02,710 INFO L226 Difference]: Without dead ends: 28 [2022-11-25 23:19:02,711 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 [2022-11-25 23:19:02,712 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 11 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 569 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 601 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 569 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-25 23:19:02,713 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 55 Invalid, 601 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 569 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-25 23:19:02,713 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2022-11-25 23:19:02,721 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 22. [2022-11-25 23:19:02,721 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) [2022-11-25 23:19:02,722 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 25 transitions. [2022-11-25 23:19:02,722 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 25 transitions. Word has length 19 [2022-11-25 23:19:02,722 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:19:02,722 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 25 transitions. [2022-11-25 23:19:02,723 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) [2022-11-25 23:19:02,723 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 25 transitions. [2022-11-25 23:19:02,723 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-11-25 23:19:02,723 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:19:02,724 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:19:02,738 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-25 23:19:02,929 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:19:02,929 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:19:02,929 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:19:02,930 INFO L85 PathProgramCache]: Analyzing trace with hash 1378796764, now seen corresponding path program 10 times [2022-11-25 23:19:02,930 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:19:02,930 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1896510827] [2022-11-25 23:19:02,930 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:19:02,930 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:19:02,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:19:03,069 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 11 proven. 14 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-25 23:19:03,069 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:19:03,069 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1896510827] [2022-11-25 23:19:03,070 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1896510827] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:19:03,070 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1890248425] [2022-11-25 23:19:03,070 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 23:19:03,070 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:19:03,070 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:19:03,075 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:19:03,080 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-25 23:19:03,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:19:03,144 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-25 23:19:03,145 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:19:03,237 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-25 23:19:03,237 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:19:03,319 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-25 23:19:03,319 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1890248425] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:19:03,319 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [716248550] [2022-11-25 23:19:03,321 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-25 23:19:03,321 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:19:03,321 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:19:03,321 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:19:03,322 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:19:03,412 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-25 23:19:03,413 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 [2022-11-25 23:19:03,425 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 [2022-11-25 23:19:03,449 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 [2022-11-25 23:19:03,513 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:03,514 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:19:03,536 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-25 23:19:03,537 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 [2022-11-25 23:19:03,593 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 [2022-11-25 23:19:03,640 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:19:03,860 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 [2022-11-25 23:19:03,860 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:19:03,860 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:19:03,861 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 19 [2022-11-25 23:19:03,861 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [892413874] [2022-11-25 23:19:03,861 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:19:03,861 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-11-25 23:19:03,861 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:19:03,862 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-11-25 23:19:03,862 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=435, Unknown=0, NotChecked=0, Total=552 [2022-11-25 23:19:03,862 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) [2022-11-25 23:19:04,016 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:19:04,016 INFO L93 Difference]: Finished difference Result 45 states and 51 transitions. [2022-11-25 23:19:04,017 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-11-25 23:19:04,017 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 [2022-11-25 23:19:04,017 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:19:04,017 INFO L225 Difference]: With dead ends: 45 [2022-11-25 23:19:04,017 INFO L226 Difference]: Without dead ends: 26 [2022-11-25 23:19:04,018 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 [2022-11-25 23:19:04,018 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 15 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 84 mSolverCounterSat, 56 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 140 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 56 IncrementalHoareTripleChecker+Valid, 84 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:19:04,019 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 19 Invalid, 140 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [56 Valid, 84 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 23:19:04,019 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2022-11-25 23:19:04,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 22. [2022-11-25 23:19:04,027 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) [2022-11-25 23:19:04,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2022-11-25 23:19:04,027 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 20 [2022-11-25 23:19:04,027 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:19:04,028 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2022-11-25 23:19:04,028 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) [2022-11-25 23:19:04,028 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2022-11-25 23:19:04,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-11-25 23:19:04,029 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:19:04,029 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:19:04,039 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-25 23:19:04,234 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-11-25 23:19:04,235 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:19:04,235 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:19:04,235 INFO L85 PathProgramCache]: Analyzing trace with hash 1249470716, now seen corresponding path program 11 times [2022-11-25 23:19:04,235 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:19:04,235 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2099271095] [2022-11-25 23:19:04,235 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:19:04,235 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:19:04,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:19:04,402 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 6 proven. 19 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-25 23:19:04,402 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:19:04,402 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2099271095] [2022-11-25 23:19:04,403 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2099271095] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:19:04,403 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [373480933] [2022-11-25 23:19:04,403 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:19:04,403 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:19:04,403 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:19:04,407 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:19:04,415 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-25 23:19:04,488 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-25 23:19:04,488 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:19:04,490 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-25 23:19:04,491 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:19:04,587 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-25 23:19:04,588 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:19:04,688 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-25 23:19:04,688 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [373480933] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:19:04,688 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1153448393] [2022-11-25 23:19:04,690 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-25 23:19:04,690 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:19:04,690 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:19:04,690 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:19:04,691 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:19:04,738 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-25 23:19:04,739 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 [2022-11-25 23:19:04,789 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-25 23:19:04,789 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 [2022-11-25 23:19:04,815 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 [2022-11-25 23:19:04,866 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:04,867 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:19:04,889 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-25 23:19:04,890 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 [2022-11-25 23:19:04,973 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 [2022-11-25 23:19:05,027 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:19:05,342 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 [2022-11-25 23:19:05,342 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:19:05,343 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:19:05,343 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2022-11-25 23:19:05,343 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [148882197] [2022-11-25 23:19:05,343 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:19:05,343 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-11-25 23:19:05,343 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:19:05,344 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-11-25 23:19:05,344 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=121, Invalid=479, Unknown=0, NotChecked=0, Total=600 [2022-11-25 23:19:05,344 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) [2022-11-25 23:19:05,504 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:19:05,505 INFO L93 Difference]: Finished difference Result 26 states and 28 transitions. [2022-11-25 23:19:05,506 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-25 23:19:05,506 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 [2022-11-25 23:19:05,506 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:19:05,506 INFO L225 Difference]: With dead ends: 26 [2022-11-25 23:19:05,506 INFO L226 Difference]: Without dead ends: 23 [2022-11-25 23:19:05,507 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 [2022-11-25 23:19:05,508 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 11 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 131 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 166 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 131 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:19:05,508 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 13 Invalid, 166 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 131 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 23:19:05,508 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2022-11-25 23:19:05,516 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2022-11-25 23:19:05,516 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) [2022-11-25 23:19:05,517 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2022-11-25 23:19:05,517 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 21 [2022-11-25 23:19:05,517 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:19:05,517 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2022-11-25 23:19:05,518 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) [2022-11-25 23:19:05,518 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2022-11-25 23:19:05,518 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-11-25 23:19:05,518 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:19:05,518 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:19:05,524 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-11-25 23:19:05,724 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-11-25 23:19:05,724 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:19:05,724 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:19:05,724 INFO L85 PathProgramCache]: Analyzing trace with hash 78730840, now seen corresponding path program 12 times [2022-11-25 23:19:05,724 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:19:05,725 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [467259062] [2022-11-25 23:19:05,725 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:19:05,725 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:19:05,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:19:07,340 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 1 proven. 44 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:19:07,340 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:19:07,341 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [467259062] [2022-11-25 23:19:07,341 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [467259062] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:19:07,341 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1287706060] [2022-11-25 23:19:07,341 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 23:19:07,341 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:19:07,341 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:19:07,345 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:19:07,355 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-25 23:19:07,429 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 23:19:07,429 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:19:07,431 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 58 conjunts are in the unsatisfiable core [2022-11-25 23:19:07,433 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:19:08,101 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 5 proven. 30 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-25 23:19:08,101 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:19:09,101 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-25 23:19:09,101 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 [2022-11-25 23:19:10,670 INFO L321 Elim1Store]: treesize reduction 250, result has 7.7 percent of original size [2022-11-25 23:19:10,670 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 [2022-11-25 23:19:10,905 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-25 23:19:10,906 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1287706060] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:19:10,906 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2033211513] [2022-11-25 23:19:10,908 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-25 23:19:10,909 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:19:10,909 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:19:10,909 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:19:10,909 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:19:10,963 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-25 23:19:10,964 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 [2022-11-25 23:19:10,975 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 [2022-11-25 23:19:10,992 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 [2022-11-25 23:19:11,056 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:11,058 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:11,070 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-25 23:19:11,071 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 [2022-11-25 23:19:11,116 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 [2022-11-25 23:19:11,164 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:19:11,982 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 [2022-11-25 23:19:11,982 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:19:11,982 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:19:11,982 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 17, 17] total 47 [2022-11-25 23:19:11,982 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1453245585] [2022-11-25 23:19:11,982 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:19:11,983 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2022-11-25 23:19:11,983 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:19:11,984 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2022-11-25 23:19:11,984 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=230, Invalid=2422, Unknown=0, NotChecked=0, Total=2652 [2022-11-25 23:19:11,985 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) [2022-11-25 23:19:14,534 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:19:14,535 INFO L93 Difference]: Finished difference Result 37 states and 40 transitions. [2022-11-25 23:19:14,535 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-11-25 23:19:14,536 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 [2022-11-25 23:19:14,536 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:19:14,536 INFO L225 Difference]: With dead ends: 37 [2022-11-25 23:19:14,536 INFO L226 Difference]: Without dead ends: 34 [2022-11-25 23:19:14,538 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 27 SyntacticMatches, 8 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1268 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=510, Invalid=4746, Unknown=0, NotChecked=0, Total=5256 [2022-11-25 23:19:14,538 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 16 mSDsluCounter, 81 mSDsCounter, 0 mSdLazyCounter, 528 mSolverCounterSat, 44 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 86 SdHoareTripleChecker+Invalid, 572 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 44 IncrementalHoareTripleChecker+Valid, 528 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-25 23:19:14,539 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 86 Invalid, 572 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [44 Valid, 528 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-25 23:19:14,539 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2022-11-25 23:19:14,549 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 25. [2022-11-25 23:19:14,549 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) [2022-11-25 23:19:14,550 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 28 transitions. [2022-11-25 23:19:14,550 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 28 transitions. Word has length 22 [2022-11-25 23:19:14,550 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:19:14,550 INFO L495 AbstractCegarLoop]: Abstraction has 25 states and 28 transitions. [2022-11-25 23:19:14,551 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) [2022-11-25 23:19:14,551 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 28 transitions. [2022-11-25 23:19:14,551 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-11-25 23:19:14,551 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:19:14,551 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:19:14,563 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-25 23:19:14,762 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:19:14,763 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:19:14,763 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:19:14,763 INFO L85 PathProgramCache]: Analyzing trace with hash -1660579219, now seen corresponding path program 13 times [2022-11-25 23:19:14,763 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:19:14,763 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [402401536] [2022-11-25 23:19:14,763 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:19:14,763 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:19:14,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:19:14,927 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 16 proven. 20 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-25 23:19:14,927 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:19:14,928 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [402401536] [2022-11-25 23:19:14,928 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [402401536] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:19:14,928 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1553870059] [2022-11-25 23:19:14,928 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 23:19:14,928 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:19:14,928 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:19:14,930 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:19:14,954 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-25 23:19:15,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:19:15,011 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 14 conjunts are in the unsatisfiable core [2022-11-25 23:19:15,013 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:19:15,126 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-25 23:19:15,126 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:19:15,223 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-25 23:19:15,223 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1553870059] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:19:15,223 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [15172836] [2022-11-25 23:19:15,224 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-25 23:19:15,225 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:19:15,225 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:19:15,225 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:19:15,225 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:19:15,300 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-25 23:19:15,300 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 [2022-11-25 23:19:15,310 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 [2022-11-25 23:19:15,328 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 [2022-11-25 23:19:15,375 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:15,377 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:15,389 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-25 23:19:15,389 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 [2022-11-25 23:19:15,437 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 [2022-11-25 23:19:15,504 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:19:15,868 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 [2022-11-25 23:19:15,868 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:19:15,868 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:19:15,868 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 22 [2022-11-25 23:19:15,869 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1599505798] [2022-11-25 23:19:15,869 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:19:15,869 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-11-25 23:19:15,869 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:19:15,870 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-11-25 23:19:15,870 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=148, Invalid=554, Unknown=0, NotChecked=0, Total=702 [2022-11-25 23:19:15,870 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) [2022-11-25 23:19:16,054 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:19:16,054 INFO L93 Difference]: Finished difference Result 51 states and 57 transitions. [2022-11-25 23:19:16,054 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-11-25 23:19:16,055 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 [2022-11-25 23:19:16,057 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:19:16,057 INFO L225 Difference]: With dead ends: 51 [2022-11-25 23:19:16,057 INFO L226 Difference]: Without dead ends: 29 [2022-11-25 23:19:16,060 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 39 SyntacticMatches, 17 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 532 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=223, Invalid=833, Unknown=0, NotChecked=0, Total=1056 [2022-11-25 23:19:16,062 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 19 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 96 mSolverCounterSat, 64 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 160 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 64 IncrementalHoareTripleChecker+Valid, 96 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:19:16,062 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 17 Invalid, 160 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [64 Valid, 96 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 23:19:16,063 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2022-11-25 23:19:16,089 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 25. [2022-11-25 23:19:16,089 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) [2022-11-25 23:19:16,089 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2022-11-25 23:19:16,090 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 23 [2022-11-25 23:19:16,090 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:19:16,090 INFO L495 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2022-11-25 23:19:16,090 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) [2022-11-25 23:19:16,090 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2022-11-25 23:19:16,098 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-11-25 23:19:16,098 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:19:16,098 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 5, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:19:16,111 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-11-25 23:19:16,307 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-11-25 23:19:16,307 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:19:16,307 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:19:16,307 INFO L85 PathProgramCache]: Analyzing trace with hash -1827210675, now seen corresponding path program 14 times [2022-11-25 23:19:16,307 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:19:16,308 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [35009323] [2022-11-25 23:19:16,308 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:19:16,308 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:19:16,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:19:16,540 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 10 proven. 26 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-11-25 23:19:16,540 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:19:16,540 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [35009323] [2022-11-25 23:19:16,540 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [35009323] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:19:16,541 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1605706883] [2022-11-25 23:19:16,541 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:19:16,541 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:19:16,541 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:19:16,542 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:19:16,578 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-25 23:19:16,651 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-25 23:19:16,651 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:19:16,652 INFO L263 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 14 conjunts are in the unsatisfiable core [2022-11-25 23:19:16,653 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:19:16,789 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 15 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-11-25 23:19:16,789 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:19:16,921 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 15 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-11-25 23:19:16,922 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1605706883] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:19:16,922 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1763313709] [2022-11-25 23:19:16,923 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-25 23:19:16,923 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:19:16,923 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:19:16,924 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:19:16,924 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:19:16,984 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-25 23:19:16,984 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 [2022-11-25 23:19:16,995 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 [2022-11-25 23:19:17,017 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 [2022-11-25 23:19:17,073 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:17,076 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:17,088 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-25 23:19:17,088 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 [2022-11-25 23:19:17,134 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 [2022-11-25 23:19:17,188 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:19:17,381 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 [2022-11-25 23:19:17,381 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:19:17,381 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:19:17,381 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 23 [2022-11-25 23:19:17,381 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1788286004] [2022-11-25 23:19:17,381 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:19:17,382 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-11-25 23:19:17,382 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:19:17,382 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-11-25 23:19:17,383 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=151, Invalid=605, Unknown=0, NotChecked=0, Total=756 [2022-11-25 23:19:17,383 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) [2022-11-25 23:19:17,577 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:19:17,577 INFO L93 Difference]: Finished difference Result 29 states and 31 transitions. [2022-11-25 23:19:17,577 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-11-25 23:19:17,578 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 [2022-11-25 23:19:17,578 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:19:17,578 INFO L225 Difference]: With dead ends: 29 [2022-11-25 23:19:17,578 INFO L226 Difference]: Without dead ends: 26 [2022-11-25 23:19:17,579 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 47 SyntacticMatches, 12 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 528 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=243, Invalid=1017, Unknown=0, NotChecked=0, Total=1260 [2022-11-25 23:19:17,579 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 11 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 163 mSolverCounterSat, 43 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 206 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 43 IncrementalHoareTripleChecker+Valid, 163 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:19:17,580 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 17 Invalid, 206 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [43 Valid, 163 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 23:19:17,580 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2022-11-25 23:19:17,591 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2022-11-25 23:19:17,592 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) [2022-11-25 23:19:17,592 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2022-11-25 23:19:17,592 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 24 [2022-11-25 23:19:17,593 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:19:17,593 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2022-11-25 23:19:17,593 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) [2022-11-25 23:19:17,593 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2022-11-25 23:19:17,594 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-11-25 23:19:17,594 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:19:17,594 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:19:17,598 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-11-25 23:19:17,794 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-11-25 23:19:17,794 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:19:17,795 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:19:17,795 INFO L85 PathProgramCache]: Analyzing trace with hash -809111769, now seen corresponding path program 15 times [2022-11-25 23:19:17,795 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:19:17,795 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [854944630] [2022-11-25 23:19:17,795 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:19:17,795 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:19:17,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:19:19,752 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 63 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:19:19,752 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:19:19,752 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [854944630] [2022-11-25 23:19:19,753 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [854944630] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:19:19,753 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1696102296] [2022-11-25 23:19:19,753 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 23:19:19,753 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:19:19,753 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:19:19,755 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:19:19,759 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-25 23:19:19,843 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 23:19:19,844 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:19:19,846 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 64 conjunts are in the unsatisfiable core [2022-11-25 23:19:19,847 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:19:20,695 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 6 proven. 42 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-25 23:19:20,695 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:19:22,224 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-25 23:19:22,225 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 [2022-11-25 23:19:26,108 INFO L321 Elim1Store]: treesize reduction 366, result has 6.4 percent of original size [2022-11-25 23:19:26,108 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 [2022-11-25 23:19:26,293 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 48 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-25 23:19:26,293 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1696102296] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:19:26,294 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [374266384] [2022-11-25 23:19:26,295 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-25 23:19:26,295 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:19:26,295 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:19:26,295 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:19:26,295 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:19:26,353 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-25 23:19:26,354 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 [2022-11-25 23:19:26,365 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 [2022-11-25 23:19:26,389 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 [2022-11-25 23:19:26,434 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:26,434 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:19:26,457 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-25 23:19:26,458 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 [2022-11-25 23:19:26,544 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 [2022-11-25 23:19:26,605 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:19:27,107 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 [2022-11-25 23:19:27,107 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:19:27,107 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:19:27,107 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 19, 18] total 53 [2022-11-25 23:19:27,107 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1307593690] [2022-11-25 23:19:27,107 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:19:27,108 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2022-11-25 23:19:27,108 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:19:27,108 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2022-11-25 23:19:27,109 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=247, Invalid=3059, Unknown=0, NotChecked=0, Total=3306 [2022-11-25 23:19:27,110 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) [2022-11-25 23:19:30,484 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:19:30,484 INFO L93 Difference]: Finished difference Result 41 states and 44 transitions. [2022-11-25 23:19:30,485 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-11-25 23:19:30,485 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 [2022-11-25 23:19:30,485 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:19:30,485 INFO L225 Difference]: With dead ends: 41 [2022-11-25 23:19:30,486 INFO L226 Difference]: Without dead ends: 38 [2022-11-25 23:19:30,487 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 39 SyntacticMatches, 2 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1094 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=509, Invalid=5971, Unknown=0, NotChecked=0, Total=6480 [2022-11-25 23:19:30,487 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 19 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 835 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 874 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 835 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-25 23:19:30,488 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 70 Invalid, 874 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 835 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-25 23:19:30,488 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2022-11-25 23:19:30,500 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 28. [2022-11-25 23:19:30,500 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) [2022-11-25 23:19:30,500 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 31 transitions. [2022-11-25 23:19:30,500 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 31 transitions. Word has length 25 [2022-11-25 23:19:30,501 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:19:30,501 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 31 transitions. [2022-11-25 23:19:30,501 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) [2022-11-25 23:19:30,501 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 31 transitions. [2022-11-25 23:19:30,501 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-11-25 23:19:30,501 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:19:30,502 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:19:30,509 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-11-25 23:19:30,707 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-11-25 23:19:30,707 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:19:30,707 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:19:30,707 INFO L85 PathProgramCache]: Analyzing trace with hash -1892231748, now seen corresponding path program 16 times [2022-11-25 23:19:30,707 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:19:30,707 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1744012942] [2022-11-25 23:19:30,707 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:19:30,708 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:19:30,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:19:30,925 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 22 proven. 27 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-11-25 23:19:30,926 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:19:30,926 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1744012942] [2022-11-25 23:19:30,926 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1744012942] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:19:30,926 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1615669997] [2022-11-25 23:19:30,926 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 23:19:30,927 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:19:30,927 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:19:30,928 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:19:30,946 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-11-25 23:19:31,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:19:31,008 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 16 conjunts are in the unsatisfiable core [2022-11-25 23:19:31,009 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:19:31,168 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-11-25 23:19:31,168 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:19:31,307 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-11-25 23:19:31,307 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1615669997] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:19:31,307 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [903700979] [2022-11-25 23:19:31,309 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-25 23:19:31,309 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:19:31,309 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:19:31,309 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:19:31,309 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:19:31,368 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-25 23:19:31,368 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 [2022-11-25 23:19:31,381 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 [2022-11-25 23:19:31,403 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 [2022-11-25 23:19:31,452 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:31,454 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:31,465 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-25 23:19:31,466 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 [2022-11-25 23:19:31,522 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 [2022-11-25 23:19:31,568 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:19:31,810 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 [2022-11-25 23:19:31,810 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:19:31,810 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:19:31,811 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 25 [2022-11-25 23:19:31,811 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [373451290] [2022-11-25 23:19:31,811 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:19:31,811 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-11-25 23:19:31,811 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:19:31,812 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-11-25 23:19:31,812 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=183, Invalid=687, Unknown=0, NotChecked=0, Total=870 [2022-11-25 23:19:31,812 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) [2022-11-25 23:19:32,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:19:32,018 INFO L93 Difference]: Finished difference Result 57 states and 63 transitions. [2022-11-25 23:19:32,019 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-11-25 23:19:32,019 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 [2022-11-25 23:19:32,019 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:19:32,019 INFO L225 Difference]: With dead ends: 57 [2022-11-25 23:19:32,019 INFO L226 Difference]: Without dead ends: 32 [2022-11-25 23:19:32,020 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 [2022-11-25 23:19:32,021 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 11 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 116 mSolverCounterSat, 68 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 184 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 68 IncrementalHoareTripleChecker+Valid, 116 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:19:32,021 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 23 Invalid, 184 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [68 Valid, 116 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 23:19:32,022 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2022-11-25 23:19:32,037 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 28. [2022-11-25 23:19:32,037 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) [2022-11-25 23:19:32,037 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2022-11-25 23:19:32,037 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 26 [2022-11-25 23:19:32,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:19:32,038 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2022-11-25 23:19:32,038 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) [2022-11-25 23:19:32,038 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2022-11-25 23:19:32,038 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-11-25 23:19:32,039 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:19:32,039 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 6, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:19:32,044 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-11-25 23:19:32,244 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-11-25 23:19:32,244 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:19:32,244 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:19:32,244 INFO L85 PathProgramCache]: Analyzing trace with hash -1027743268, now seen corresponding path program 17 times [2022-11-25 23:19:32,244 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:19:32,245 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [285963585] [2022-11-25 23:19:32,245 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:19:32,245 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:19:32,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:19:32,484 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 15 proven. 34 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-11-25 23:19:32,484 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:19:32,485 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [285963585] [2022-11-25 23:19:32,485 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [285963585] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:19:32,485 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [191819988] [2022-11-25 23:19:32,485 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:19:32,485 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:19:32,485 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:19:32,486 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:19:32,506 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-11-25 23:19:32,599 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-11-25 23:19:32,599 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:19:32,601 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 16 conjunts are in the unsatisfiable core [2022-11-25 23:19:32,602 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:19:32,763 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 21 proven. 28 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-11-25 23:19:32,763 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:19:32,917 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 21 proven. 28 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-11-25 23:19:32,918 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [191819988] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:19:32,918 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1675046893] [2022-11-25 23:19:32,919 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-25 23:19:32,919 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:19:32,919 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:19:32,919 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:19:32,919 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:19:32,974 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-25 23:19:32,974 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 [2022-11-25 23:19:33,031 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-25 23:19:33,031 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 [2022-11-25 23:19:33,054 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 [2022-11-25 23:19:33,118 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:33,120 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:33,131 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-25 23:19:33,132 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 [2022-11-25 23:19:33,174 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 [2022-11-25 23:19:33,234 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:19:33,614 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 [2022-11-25 23:19:33,614 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:19:33,615 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:19:33,615 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 26 [2022-11-25 23:19:33,615 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1325463761] [2022-11-25 23:19:33,615 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:19:33,615 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-11-25 23:19:33,615 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:19:33,616 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-11-25 23:19:33,616 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=745, Unknown=0, NotChecked=0, Total=930 [2022-11-25 23:19:33,616 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) [2022-11-25 23:19:33,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:19:33,873 INFO L93 Difference]: Finished difference Result 32 states and 34 transitions. [2022-11-25 23:19:33,873 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-11-25 23:19:33,874 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 [2022-11-25 23:19:33,874 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:19:33,874 INFO L225 Difference]: With dead ends: 32 [2022-11-25 23:19:33,874 INFO L226 Difference]: Without dead ends: 29 [2022-11-25 23:19:33,875 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 [2022-11-25 23:19:33,875 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 17 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 161 mSolverCounterSat, 71 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 232 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 71 IncrementalHoareTripleChecker+Valid, 161 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:19:33,876 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [17 Valid, 11 Invalid, 232 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [71 Valid, 161 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 23:19:33,876 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2022-11-25 23:19:33,892 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2022-11-25 23:19:33,893 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) [2022-11-25 23:19:33,893 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2022-11-25 23:19:33,893 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 27 [2022-11-25 23:19:33,893 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:19:33,893 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2022-11-25 23:19:33,893 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) [2022-11-25 23:19:33,894 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2022-11-25 23:19:33,895 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-11-25 23:19:33,895 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:19:33,896 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 7, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:19:33,906 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-11-25 23:19:34,101 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:19:34,101 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:19:34,101 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:19:34,101 INFO L85 PathProgramCache]: Analyzing trace with hash -1795425928, now seen corresponding path program 18 times [2022-11-25 23:19:34,101 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:19:34,101 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [291601054] [2022-11-25 23:19:34,102 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:19:34,102 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:19:34,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:19:36,928 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:19:36,928 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:19:36,928 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [291601054] [2022-11-25 23:19:36,929 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [291601054] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:19:36,929 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2001398288] [2022-11-25 23:19:36,929 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 23:19:36,929 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:19:36,929 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:19:36,930 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:19:36,954 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-11-25 23:19:37,033 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 23:19:37,033 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:19:37,035 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 66 conjunts are in the unsatisfiable core [2022-11-25 23:19:37,037 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:19:38,148 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-11-25 23:19:38,149 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:19:40,180 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-25 23:19:40,180 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 [2022-11-25 23:19:48,646 INFO L321 Elim1Store]: treesize reduction 504, result has 5.4 percent of original size [2022-11-25 23:19:48,646 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 [2022-11-25 23:19:48,737 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-11-25 23:19:48,737 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2001398288] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:19:48,737 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2002695486] [2022-11-25 23:19:48,738 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-25 23:19:48,738 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:19:48,739 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:19:48,739 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:19:48,739 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:19:48,795 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-25 23:19:48,796 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 [2022-11-25 23:19:48,847 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-25 23:19:48,847 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 [2022-11-25 23:19:48,866 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 [2022-11-25 23:19:48,904 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:48,905 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:19:48,926 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-25 23:19:48,927 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 [2022-11-25 23:19:48,977 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 [2022-11-25 23:19:49,029 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:19:50,219 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 [2022-11-25 23:19:50,219 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:19:50,219 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:19:50,219 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 20, 19] total 58 [2022-11-25 23:19:50,219 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2097331897] [2022-11-25 23:19:50,219 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:19:50,220 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2022-11-25 23:19:50,220 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:19:50,220 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2022-11-25 23:19:50,221 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=202, Invalid=3704, Unknown=0, NotChecked=0, Total=3906 [2022-11-25 23:19:50,221 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) [2022-11-25 23:19:52,993 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:19:52,994 INFO L93 Difference]: Finished difference Result 45 states and 48 transitions. [2022-11-25 23:19:52,994 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-11-25 23:19:52,994 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 [2022-11-25 23:19:52,994 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:19:52,995 INFO L225 Difference]: With dead ends: 45 [2022-11-25 23:19:52,995 INFO L226 Difference]: Without dead ends: 42 [2022-11-25 23:19:52,997 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 38 SyntacticMatches, 10 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1373 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=323, Invalid=5839, Unknown=0, NotChecked=0, Total=6162 [2022-11-25 23:19:52,998 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 6 mSDsluCounter, 132 mSDsCounter, 0 mSdLazyCounter, 1017 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 137 SdHoareTripleChecker+Invalid, 1027 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 1017 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-11-25 23:19:52,998 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 137 Invalid, 1027 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 1017 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-11-25 23:19:52,999 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2022-11-25 23:19:53,014 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 31. [2022-11-25 23:19:53,015 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) [2022-11-25 23:19:53,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 34 transitions. [2022-11-25 23:19:53,015 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 34 transitions. Word has length 28 [2022-11-25 23:19:53,015 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:19:53,015 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 34 transitions. [2022-11-25 23:19:53,016 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) [2022-11-25 23:19:53,016 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 34 transitions. [2022-11-25 23:19:53,016 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-11-25 23:19:53,016 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:19:53,016 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:19:53,023 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-11-25 23:19:53,217 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:19:53,218 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:19:53,218 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:19:53,218 INFO L85 PathProgramCache]: Analyzing trace with hash 1818729229, now seen corresponding path program 19 times [2022-11-25 23:19:53,218 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:19:53,218 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1539993544] [2022-11-25 23:19:53,218 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:19:53,219 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:19:53,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:19:53,466 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 29 proven. 35 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-11-25 23:19:53,466 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:19:53,466 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1539993544] [2022-11-25 23:19:53,466 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1539993544] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:19:53,466 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1569838552] [2022-11-25 23:19:53,466 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 23:19:53,467 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:19:53,467 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:19:53,468 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:19:53,499 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-11-25 23:19:53,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:19:53,566 INFO L263 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-25 23:19:53,567 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:19:53,750 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 36 proven. 28 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-11-25 23:19:53,750 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:19:53,905 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 36 proven. 28 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-11-25 23:19:53,905 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1569838552] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:19:53,905 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2106436060] [2022-11-25 23:19:53,906 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-25 23:19:53,906 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:19:53,907 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:19:53,907 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:19:53,907 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:19:53,960 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-25 23:19:53,960 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 [2022-11-25 23:19:54,015 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-25 23:19:54,015 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 [2022-11-25 23:19:54,038 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 [2022-11-25 23:19:54,090 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:54,092 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:54,103 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-25 23:19:54,104 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 [2022-11-25 23:19:54,147 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 [2022-11-25 23:19:54,207 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:19:54,687 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 [2022-11-25 23:19:54,687 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:19:54,687 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:19:54,687 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 28 [2022-11-25 23:19:54,687 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1765835171] [2022-11-25 23:19:54,687 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:19:54,688 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-11-25 23:19:54,688 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:19:54,688 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-11-25 23:19:54,689 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=834, Unknown=0, NotChecked=0, Total=1056 [2022-11-25 23:19:54,689 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) [2022-11-25 23:19:54,962 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:19:54,962 INFO L93 Difference]: Finished difference Result 63 states and 69 transitions. [2022-11-25 23:19:54,962 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-11-25 23:19:54,963 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 [2022-11-25 23:19:54,963 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:19:54,963 INFO L225 Difference]: With dead ends: 63 [2022-11-25 23:19:54,963 INFO L226 Difference]: Without dead ends: 35 [2022-11-25 23:19:54,964 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 [2022-11-25 23:19:54,965 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 11 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 211 mSolverCounterSat, 66 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 277 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 66 IncrementalHoareTripleChecker+Valid, 211 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:19:54,965 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 25 Invalid, 277 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [66 Valid, 211 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 23:19:54,966 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2022-11-25 23:19:55,002 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 31. [2022-11-25 23:19:55,002 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) [2022-11-25 23:19:55,003 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 33 transitions. [2022-11-25 23:19:55,003 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 33 transitions. Word has length 29 [2022-11-25 23:19:55,003 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:19:55,003 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 33 transitions. [2022-11-25 23:19:55,003 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) [2022-11-25 23:19:55,004 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 33 transitions. [2022-11-25 23:19:55,004 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-11-25 23:19:55,004 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:19:55,004 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 7, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:19:55,015 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-11-25 23:19:55,210 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:19:55,210 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:19:55,210 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:19:55,210 INFO L85 PathProgramCache]: Analyzing trace with hash -1123837203, now seen corresponding path program 20 times [2022-11-25 23:19:55,211 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:19:55,211 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [447925634] [2022-11-25 23:19:55,211 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:19:55,211 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:19:55,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:19:55,480 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 21 proven. 43 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-25 23:19:55,480 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:19:55,480 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [447925634] [2022-11-25 23:19:55,480 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [447925634] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:19:55,480 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1188263473] [2022-11-25 23:19:55,480 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:19:55,480 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:19:55,481 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:19:55,482 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:19:55,491 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-11-25 23:19:55,595 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-11-25 23:19:55,595 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:19:55,597 INFO L263 TraceCheckSpWp]: Trace formula consists of 192 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-25 23:19:55,598 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:19:55,774 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 28 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-25 23:19:55,774 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:19:55,936 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 28 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-25 23:19:55,936 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1188263473] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:19:55,936 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1873106898] [2022-11-25 23:19:55,938 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-25 23:19:55,938 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:19:55,938 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:19:55,938 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:19:55,938 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:19:55,996 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-25 23:19:55,996 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 [2022-11-25 23:19:56,046 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-25 23:19:56,046 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 [2022-11-25 23:19:56,063 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 [2022-11-25 23:19:56,123 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:56,126 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:56,137 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-25 23:19:56,137 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 [2022-11-25 23:19:56,180 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 [2022-11-25 23:19:56,229 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:19:56,653 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 [2022-11-25 23:19:56,654 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:19:56,654 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:19:56,654 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 29 [2022-11-25 23:19:56,654 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [679000653] [2022-11-25 23:19:56,654 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:19:56,654 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-11-25 23:19:56,655 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:19:56,655 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-11-25 23:19:56,655 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=223, Invalid=899, Unknown=0, NotChecked=0, Total=1122 [2022-11-25 23:19:56,656 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) [2022-11-25 23:19:56,957 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:19:56,958 INFO L93 Difference]: Finished difference Result 35 states and 37 transitions. [2022-11-25 23:19:56,959 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-11-25 23:19:56,959 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 [2022-11-25 23:19:56,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:19:56,959 INFO L225 Difference]: With dead ends: 35 [2022-11-25 23:19:56,959 INFO L226 Difference]: Without dead ends: 32 [2022-11-25 23:19:56,961 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 [2022-11-25 23:19:56,962 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 17 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 166 mSolverCounterSat, 81 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 247 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 81 IncrementalHoareTripleChecker+Valid, 166 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:19:56,962 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [17 Valid, 11 Invalid, 247 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [81 Valid, 166 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 23:19:56,963 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2022-11-25 23:19:56,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2022-11-25 23:19:56,984 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) [2022-11-25 23:19:56,984 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2022-11-25 23:19:56,984 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 30 [2022-11-25 23:19:56,984 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:19:56,985 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2022-11-25 23:19:56,985 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) [2022-11-25 23:19:56,985 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2022-11-25 23:19:56,985 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-11-25 23:19:56,985 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:19:56,986 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 8, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:19:56,990 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-11-25 23:19:57,190 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:19:57,190 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:19:57,190 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:19:57,190 INFO L85 PathProgramCache]: Analyzing trace with hash -479370617, now seen corresponding path program 21 times [2022-11-25 23:19:57,190 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:19:57,191 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1082148523] [2022-11-25 23:19:57,191 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:19:57,191 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:19:57,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:20:00,614 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 10 proven. 98 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:20:00,614 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:20:00,614 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1082148523] [2022-11-25 23:20:00,614 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1082148523] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:20:00,614 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1748921934] [2022-11-25 23:20:00,614 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 23:20:00,615 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:20:00,615 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:20:00,615 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:20:00,618 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-11-25 23:20:00,713 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 23:20:00,714 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:20:00,716 WARN L261 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 109 conjunts are in the unsatisfiable core [2022-11-25 23:20:00,720 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:20:00,763 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 [2022-11-25 23:20:00,816 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 [2022-11-25 23:20:00,869 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 [2022-11-25 23:20:00,934 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 [2022-11-25 23:20:00,987 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 [2022-11-25 23:20:01,045 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 [2022-11-25 23:20:01,109 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 [2022-11-25 23:20:03,474 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 14 proven. 93 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-25 23:20:03,475 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:20:06,690 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 0 proven. 107 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-25 23:20:06,690 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1748921934] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:20:06,690 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [278605829] [2022-11-25 23:20:06,692 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-25 23:20:06,692 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:20:06,692 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:20:06,692 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:20:06,692 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:20:06,745 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-25 23:20:06,746 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 [2022-11-25 23:20:06,756 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 [2022-11-25 23:20:06,775 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 [2022-11-25 23:20:06,826 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:06,827 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:20:06,849 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-25 23:20:06,850 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 [2022-11-25 23:20:06,898 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-25 23:20:06,942 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:20:07,627 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 [2022-11-25 23:20:07,627 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:20:07,627 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:20:07,627 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29, 28] total 80 [2022-11-25 23:20:07,628 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [262490598] [2022-11-25 23:20:07,628 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:20:07,628 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 80 states [2022-11-25 23:20:07,628 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:20:07,629 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2022-11-25 23:20:07,630 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=609, Invalid=6531, Unknown=0, NotChecked=0, Total=7140 [2022-11-25 23:20:07,630 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) [2022-11-25 23:20:18,984 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:20:18,984 INFO L93 Difference]: Finished difference Result 55 states and 59 transitions. [2022-11-25 23:20:18,984 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-11-25 23:20:18,985 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 [2022-11-25 23:20:18,985 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:20:18,985 INFO L225 Difference]: With dead ends: 55 [2022-11-25 23:20:18,985 INFO L226 Difference]: Without dead ends: 52 [2022-11-25 23:20:18,987 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 36 SyntacticMatches, 2 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3472 ImplicationChecksByTransitivity, 16.8s TimeCoverageRelationStatistics Valid=1358, Invalid=12684, Unknown=0, NotChecked=0, Total=14042 [2022-11-25 23:20:18,987 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 45 mSDsluCounter, 110 mSDsCounter, 0 mSdLazyCounter, 1193 mSolverCounterSat, 104 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 115 SdHoareTripleChecker+Invalid, 1297 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 104 IncrementalHoareTripleChecker+Valid, 1193 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2022-11-25 23:20:18,987 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [45 Valid, 115 Invalid, 1297 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [104 Valid, 1193 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2022-11-25 23:20:18,988 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2022-11-25 23:20:19,020 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 34. [2022-11-25 23:20:19,020 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) [2022-11-25 23:20:19,020 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 37 transitions. [2022-11-25 23:20:19,021 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 37 transitions. Word has length 31 [2022-11-25 23:20:19,021 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:20:19,021 INFO L495 AbstractCegarLoop]: Abstraction has 34 states and 37 transitions. [2022-11-25 23:20:19,021 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) [2022-11-25 23:20:19,021 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 37 transitions. [2022-11-25 23:20:19,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-11-25 23:20:19,022 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:20:19,022 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:20:19,035 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2022-11-25 23:20:19,227 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2022-11-25 23:20:19,228 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:20:19,228 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:20:19,228 INFO L85 PathProgramCache]: Analyzing trace with hash 1697545884, now seen corresponding path program 22 times [2022-11-25 23:20:19,228 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:20:19,228 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [425567897] [2022-11-25 23:20:19,228 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:20:19,228 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:20:19,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:20:19,513 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 37 proven. 44 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-25 23:20:19,513 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:20:19,513 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [425567897] [2022-11-25 23:20:19,513 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [425567897] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:20:19,513 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [93454017] [2022-11-25 23:20:19,513 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 23:20:19,514 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:20:19,514 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:20:19,515 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:20:19,517 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-11-25 23:20:19,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:20:19,618 INFO L263 TraceCheckSpWp]: Trace formula consists of 202 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-25 23:20:19,619 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:20:19,848 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 45 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-25 23:20:19,849 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:20:20,017 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 45 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-25 23:20:20,017 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [93454017] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:20:20,017 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1128082000] [2022-11-25 23:20:20,019 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-25 23:20:20,019 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:20:20,019 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:20:20,019 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:20:20,020 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:20:20,067 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-25 23:20:20,067 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 [2022-11-25 23:20:20,116 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-25 23:20:20,116 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 [2022-11-25 23:20:20,136 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 [2022-11-25 23:20:20,194 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:20,195 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:20:20,217 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-25 23:20:20,217 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 [2022-11-25 23:20:20,287 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 [2022-11-25 23:20:20,332 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:20:20,584 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 [2022-11-25 23:20:20,585 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:20:20,585 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:20:20,585 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 31 [2022-11-25 23:20:20,585 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [94624722] [2022-11-25 23:20:20,585 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:20:20,586 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-11-25 23:20:20,586 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:20:20,586 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-11-25 23:20:20,587 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=265, Invalid=995, Unknown=0, NotChecked=0, Total=1260 [2022-11-25 23:20:20,587 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) [2022-11-25 23:20:20,882 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:20:20,883 INFO L93 Difference]: Finished difference Result 69 states and 75 transitions. [2022-11-25 23:20:20,883 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-11-25 23:20:20,883 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 [2022-11-25 23:20:20,883 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:20:20,883 INFO L225 Difference]: With dead ends: 69 [2022-11-25 23:20:20,884 INFO L226 Difference]: Without dead ends: 38 [2022-11-25 23:20:20,884 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 [2022-11-25 23:20:20,885 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 23 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 141 mSolverCounterSat, 92 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 233 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 92 IncrementalHoareTripleChecker+Valid, 141 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:20:20,885 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [23 Valid, 19 Invalid, 233 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [92 Valid, 141 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 23:20:20,886 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2022-11-25 23:20:20,913 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 34. [2022-11-25 23:20:20,913 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) [2022-11-25 23:20:20,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 36 transitions. [2022-11-25 23:20:20,913 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 36 transitions. Word has length 32 [2022-11-25 23:20:20,913 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:20:20,913 INFO L495 AbstractCegarLoop]: Abstraction has 34 states and 36 transitions. [2022-11-25 23:20:20,913 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) [2022-11-25 23:20:20,914 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 36 transitions. [2022-11-25 23:20:20,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-11-25 23:20:20,914 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:20:20,914 INFO L195 NwaCegarLoop]: trace histogram [9, 9, 8, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:20:20,919 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2022-11-25 23:20:21,114 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2022-11-25 23:20:21,115 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:20:21,115 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:20:21,115 INFO L85 PathProgramCache]: Analyzing trace with hash -16518468, now seen corresponding path program 23 times [2022-11-25 23:20:21,115 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:20:21,115 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1804528718] [2022-11-25 23:20:21,115 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:20:21,115 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:20:21,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:20:21,445 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 28 proven. 53 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2022-11-25 23:20:21,445 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:20:21,445 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1804528718] [2022-11-25 23:20:21,445 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1804528718] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:20:21,445 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [990540758] [2022-11-25 23:20:21,445 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:20:21,446 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:20:21,446 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:20:21,447 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:20:21,470 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-11-25 23:20:21,603 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-11-25 23:20:21,603 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:20:21,605 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-25 23:20:21,607 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:20:21,813 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 36 proven. 45 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2022-11-25 23:20:21,813 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:20:22,026 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 36 proven. 45 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2022-11-25 23:20:22,026 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [990540758] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:20:22,026 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1667023670] [2022-11-25 23:20:22,027 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-25 23:20:22,028 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:20:22,028 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:20:22,028 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:20:22,028 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:20:22,085 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-25 23:20:22,085 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 [2022-11-25 23:20:22,095 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 [2022-11-25 23:20:22,114 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 [2022-11-25 23:20:22,168 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:22,169 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:20:22,191 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-25 23:20:22,191 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 [2022-11-25 23:20:22,268 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 [2022-11-25 23:20:22,329 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:20:22,769 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 [2022-11-25 23:20:22,769 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:20:22,769 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:20:22,769 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 32 [2022-11-25 23:20:22,770 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1715741203] [2022-11-25 23:20:22,770 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:20:22,770 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-11-25 23:20:22,770 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:20:22,771 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-11-25 23:20:22,771 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=265, Invalid=1067, Unknown=0, NotChecked=0, Total=1332 [2022-11-25 23:20:22,771 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) [2022-11-25 23:20:23,087 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:20:23,088 INFO L93 Difference]: Finished difference Result 38 states and 40 transitions. [2022-11-25 23:20:23,088 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-11-25 23:20:23,088 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 [2022-11-25 23:20:23,088 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:20:23,089 INFO L225 Difference]: With dead ends: 38 [2022-11-25 23:20:23,089 INFO L226 Difference]: Without dead ends: 35 [2022-11-25 23:20:23,089 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 57 SyntacticMatches, 27 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1380 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=438, Invalid=1818, Unknown=0, NotChecked=0, Total=2256 [2022-11-25 23:20:23,090 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 14 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 225 mSolverCounterSat, 59 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 284 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 59 IncrementalHoareTripleChecker+Valid, 225 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:20:23,090 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 13 Invalid, 284 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [59 Valid, 225 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 23:20:23,091 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2022-11-25 23:20:23,114 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2022-11-25 23:20:23,114 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) [2022-11-25 23:20:23,114 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2022-11-25 23:20:23,114 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 33 [2022-11-25 23:20:23,115 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:20:23,115 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2022-11-25 23:20:23,115 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) [2022-11-25 23:20:23,115 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2022-11-25 23:20:23,115 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-11-25 23:20:23,115 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:20:23,115 INFO L195 NwaCegarLoop]: trace histogram [9, 9, 9, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:20:23,120 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2022-11-25 23:20:23,316 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:20:23,316 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:20:23,316 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:20:23,316 INFO L85 PathProgramCache]: Analyzing trace with hash -512228200, now seen corresponding path program 24 times [2022-11-25 23:20:23,316 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:20:23,316 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1255621693] [2022-11-25 23:20:23,316 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:20:23,317 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:20:23,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:20:27,688 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 0 proven. 135 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:20:27,689 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:20:27,689 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1255621693] [2022-11-25 23:20:27,689 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1255621693] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:20:27,689 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1249368904] [2022-11-25 23:20:27,689 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 23:20:27,689 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:20:27,689 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:20:27,690 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:20:27,692 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-11-25 23:20:27,809 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 23:20:27,809 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:20:27,812 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 84 conjunts are in the unsatisfiable core [2022-11-25 23:20:27,816 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:20:27,890 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 [2022-11-25 23:20:29,767 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2022-11-25 23:20:29,767 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:20:32,987 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2022-11-25 23:20:32,987 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1249368904] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:20:32,987 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2121341844] [2022-11-25 23:20:32,989 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-25 23:20:32,989 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:20:32,989 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:20:32,989 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:20:32,989 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:20:33,049 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-25 23:20:33,050 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 [2022-11-25 23:20:33,061 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 [2022-11-25 23:20:33,081 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 [2022-11-25 23:20:33,124 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:33,127 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:33,140 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-25 23:20:33,140 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 [2022-11-25 23:20:33,180 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 [2022-11-25 23:20:33,232 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:20:35,098 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 [2022-11-25 23:20:35,099 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:20:35,099 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:20:35,099 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 24, 23] total 72 [2022-11-25 23:20:35,099 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1442312334] [2022-11-25 23:20:35,099 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:20:35,100 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 72 states [2022-11-25 23:20:35,100 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:20:35,100 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2022-11-25 23:20:35,101 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=258, Invalid=5594, Unknown=0, NotChecked=0, Total=5852 [2022-11-25 23:20:35,101 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) [2022-11-25 23:20:39,744 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:20:39,744 INFO L93 Difference]: Finished difference Result 49 states and 52 transitions. [2022-11-25 23:20:39,744 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-11-25 23:20:39,745 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 [2022-11-25 23:20:39,745 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:20:39,745 INFO L225 Difference]: With dead ends: 49 [2022-11-25 23:20:39,745 INFO L226 Difference]: Without dead ends: 46 [2022-11-25 23:20:39,746 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 46 SyntacticMatches, 12 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1902 ImplicationChecksByTransitivity, 11.2s TimeCoverageRelationStatistics Valid=408, Invalid=8712, Unknown=0, NotChecked=0, Total=9120 [2022-11-25 23:20:39,747 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 2 mSDsluCounter, 74 mSDsCounter, 0 mSdLazyCounter, 1373 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 77 SdHoareTripleChecker+Invalid, 1377 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 1373 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2022-11-25 23:20:39,747 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 77 Invalid, 1377 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 1373 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2022-11-25 23:20:39,748 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2022-11-25 23:20:39,777 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 37. [2022-11-25 23:20:39,777 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) [2022-11-25 23:20:39,777 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 40 transitions. [2022-11-25 23:20:39,777 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 40 transitions. Word has length 34 [2022-11-25 23:20:39,778 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:20:39,778 INFO L495 AbstractCegarLoop]: Abstraction has 37 states and 40 transitions. [2022-11-25 23:20:39,778 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) [2022-11-25 23:20:39,778 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 40 transitions. [2022-11-25 23:20:39,778 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-11-25 23:20:39,778 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:20:39,779 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:20:39,783 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2022-11-25 23:20:39,979 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2022-11-25 23:20:39,979 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:20:39,979 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:20:39,979 INFO L85 PathProgramCache]: Analyzing trace with hash -791524435, now seen corresponding path program 25 times [2022-11-25 23:20:39,980 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:20:39,980 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [931367598] [2022-11-25 23:20:39,980 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:20:39,980 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:20:39,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:20:40,311 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 46 proven. 54 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2022-11-25 23:20:40,311 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:20:40,311 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [931367598] [2022-11-25 23:20:40,312 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [931367598] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:20:40,312 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [357516316] [2022-11-25 23:20:40,312 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 23:20:40,312 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:20:40,312 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:20:40,313 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:20:40,345 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-11-25 23:20:40,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:20:40,437 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 22 conjunts are in the unsatisfiable core [2022-11-25 23:20:40,438 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:20:40,733 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 55 proven. 45 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2022-11-25 23:20:40,733 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:20:40,952 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 55 proven. 45 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2022-11-25 23:20:40,953 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [357516316] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:20:40,953 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1679981848] [2022-11-25 23:20:40,954 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-25 23:20:40,954 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:20:40,955 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:20:40,955 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:20:40,955 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:20:41,023 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-25 23:20:41,024 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 [2022-11-25 23:20:41,083 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-25 23:20:41,083 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 [2022-11-25 23:20:41,107 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 [2022-11-25 23:20:41,145 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:41,147 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:41,159 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-25 23:20:41,159 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 [2022-11-25 23:20:41,208 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 [2022-11-25 23:20:41,253 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:20:41,526 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 [2022-11-25 23:20:41,526 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:20:41,527 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:20:41,527 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 34 [2022-11-25 23:20:41,527 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [218357327] [2022-11-25 23:20:41,527 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:20:41,527 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2022-11-25 23:20:41,527 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:20:41,528 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2022-11-25 23:20:41,528 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=312, Invalid=1170, Unknown=0, NotChecked=0, Total=1482 [2022-11-25 23:20:41,528 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) [2022-11-25 23:20:41,896 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:20:41,897 INFO L93 Difference]: Finished difference Result 75 states and 81 transitions. [2022-11-25 23:20:41,897 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-11-25 23:20:41,898 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 [2022-11-25 23:20:41,898 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:20:41,898 INFO L225 Difference]: With dead ends: 75 [2022-11-25 23:20:41,898 INFO L226 Difference]: Without dead ends: 41 [2022-11-25 23:20:41,902 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 [2022-11-25 23:20:41,902 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 11 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 177 mSolverCounterSat, 115 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 292 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 115 IncrementalHoareTripleChecker+Valid, 177 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-25 23:20:41,903 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 15 Invalid, 292 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [115 Valid, 177 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-25 23:20:41,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2022-11-25 23:20:41,944 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 37. [2022-11-25 23:20:41,944 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) [2022-11-25 23:20:41,944 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 39 transitions. [2022-11-25 23:20:41,945 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 39 transitions. Word has length 35 [2022-11-25 23:20:41,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:20:41,945 INFO L495 AbstractCegarLoop]: Abstraction has 37 states and 39 transitions. [2022-11-25 23:20:41,945 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) [2022-11-25 23:20:41,945 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 39 transitions. [2022-11-25 23:20:41,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-11-25 23:20:41,946 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:20:41,946 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 9, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:20:41,952 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2022-11-25 23:20:42,151 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2022-11-25 23:20:42,152 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:20:42,152 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:20:42,152 INFO L85 PathProgramCache]: Analyzing trace with hash -1616452723, now seen corresponding path program 26 times [2022-11-25 23:20:42,152 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:20:42,152 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [779448416] [2022-11-25 23:20:42,152 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:20:42,152 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:20:42,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:20:42,530 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 36 proven. 64 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-11-25 23:20:42,530 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:20:42,531 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [779448416] [2022-11-25 23:20:42,531 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [779448416] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:20:42,531 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [434767840] [2022-11-25 23:20:42,531 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:20:42,531 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:20:42,531 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:20:42,535 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:20:42,562 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2022-11-25 23:20:42,698 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-11-25 23:20:42,698 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:20:42,700 INFO L263 TraceCheckSpWp]: Trace formula consists of 226 conjuncts, 22 conjunts are in the unsatisfiable core [2022-11-25 23:20:42,701 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:20:42,920 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 45 proven. 55 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-11-25 23:20:42,920 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:20:43,134 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 45 proven. 55 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-11-25 23:20:43,134 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [434767840] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:20:43,134 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1767956340] [2022-11-25 23:20:43,135 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-25 23:20:43,136 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:20:43,136 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:20:43,136 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:20:43,136 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:20:43,203 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-25 23:20:43,203 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 [2022-11-25 23:20:43,214 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 [2022-11-25 23:20:43,232 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 [2022-11-25 23:20:43,277 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:43,278 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:20:43,305 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-25 23:20:43,306 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 [2022-11-25 23:20:43,387 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 [2022-11-25 23:20:43,432 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:20:43,672 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 [2022-11-25 23:20:43,672 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:20:43,672 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:20:43,672 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 35 [2022-11-25 23:20:43,673 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1476789765] [2022-11-25 23:20:43,673 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:20:43,673 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-11-25 23:20:43,673 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:20:43,674 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-11-25 23:20:43,674 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=311, Invalid=1249, Unknown=0, NotChecked=0, Total=1560 [2022-11-25 23:20:43,674 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) [2022-11-25 23:20:44,036 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:20:44,036 INFO L93 Difference]: Finished difference Result 41 states and 43 transitions. [2022-11-25 23:20:44,036 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-11-25 23:20:44,036 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 [2022-11-25 23:20:44,037 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:20:44,037 INFO L225 Difference]: With dead ends: 41 [2022-11-25 23:20:44,037 INFO L226 Difference]: Without dead ends: 38 [2022-11-25 23:20:44,038 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 [2022-11-25 23:20:44,038 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 17 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 257 mSolverCounterSat, 61 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 318 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 61 IncrementalHoareTripleChecker+Valid, 257 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-25 23:20:44,039 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [17 Valid, 13 Invalid, 318 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [61 Valid, 257 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-25 23:20:44,039 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2022-11-25 23:20:44,074 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2022-11-25 23:20:44,075 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) [2022-11-25 23:20:44,075 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2022-11-25 23:20:44,075 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 36 [2022-11-25 23:20:44,075 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:20:44,075 INFO L495 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2022-11-25 23:20:44,075 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) [2022-11-25 23:20:44,075 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2022-11-25 23:20:44,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-11-25 23:20:44,076 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:20:44,076 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 10, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:20:44,081 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2022-11-25 23:20:44,276 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2022-11-25 23:20:44,276 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:20:44,277 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:20:44,277 INFO L85 PathProgramCache]: Analyzing trace with hash 1429417447, now seen corresponding path program 27 times [2022-11-25 23:20:44,277 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:20:44,277 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1832439384] [2022-11-25 23:20:44,277 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:20:44,277 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:20:44,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:20:49,246 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 21 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:20:49,246 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:20:49,247 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1832439384] [2022-11-25 23:20:49,247 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1832439384] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:20:49,247 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1995612305] [2022-11-25 23:20:49,247 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 23:20:49,247 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:20:49,247 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:20:49,248 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:20:49,250 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2022-11-25 23:20:49,379 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 23:20:49,379 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:20:49,382 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 90 conjunts are in the unsatisfiable core [2022-11-25 23:20:49,384 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:20:51,594 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-11-25 23:20:51,594 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:20:56,429 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-25 23:20:56,429 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 [2022-11-25 23:21:29,242 INFO L321 Elim1Store]: treesize reduction 1050, result has 3.8 percent of original size [2022-11-25 23:21:29,243 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 [2022-11-25 23:21:29,379 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-11-25 23:21:29,380 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1995612305] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:21:29,380 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [115999258] [2022-11-25 23:21:29,381 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-25 23:21:29,381 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:21:29,381 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:21:29,382 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:21:29,382 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:21:29,436 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-25 23:21:29,436 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 [2022-11-25 23:21:29,485 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-25 23:21:29,486 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 [2022-11-25 23:21:29,526 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 [2022-11-25 23:21:29,562 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:21:29,563 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:21:29,585 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-25 23:21:29,585 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 [2022-11-25 23:21:29,633 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 [2022-11-25 23:21:29,689 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:21:31,604 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 [2022-11-25 23:21:31,604 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:21:31,604 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:21:31,604 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 26, 25] total 79 [2022-11-25 23:21:31,604 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2034539014] [2022-11-25 23:21:31,605 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:21:31,605 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 79 states [2022-11-25 23:21:31,605 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:21:31,606 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2022-11-25 23:21:31,606 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=337, Invalid=6635, Unknown=0, NotChecked=0, Total=6972 [2022-11-25 23:21:31,606 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) [2022-11-25 23:21:37,684 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:21:37,684 INFO L93 Difference]: Finished difference Result 57 states and 60 transitions. [2022-11-25 23:21:37,684 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-11-25 23:21:37,684 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 [2022-11-25 23:21:37,685 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:21:37,685 INFO L225 Difference]: With dead ends: 57 [2022-11-25 23:21:37,685 INFO L226 Difference]: Without dead ends: 54 [2022-11-25 23:21:37,686 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 50 SyntacticMatches, 13 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3659 ImplicationChecksByTransitivity, 12.8s TimeCoverageRelationStatistics Valid=659, Invalid=11773, Unknown=0, NotChecked=0, Total=12432 [2022-11-25 23:21:37,687 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 22 mSDsluCounter, 163 mSDsCounter, 0 mSdLazyCounter, 1588 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 168 SdHoareTripleChecker+Invalid, 1621 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 1588 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2022-11-25 23:21:37,687 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [22 Valid, 168 Invalid, 1621 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 1588 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2022-11-25 23:21:37,688 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2022-11-25 23:21:37,724 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 40. [2022-11-25 23:21:37,724 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) [2022-11-25 23:21:37,724 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 43 transitions. [2022-11-25 23:21:37,725 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 43 transitions. Word has length 37 [2022-11-25 23:21:37,725 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:21:37,725 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 43 transitions. [2022-11-25 23:21:37,725 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) [2022-11-25 23:21:37,725 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 43 transitions. [2022-11-25 23:21:37,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-11-25 23:21:37,725 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:21:37,726 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:21:37,731 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2022-11-25 23:21:37,926 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2022-11-25 23:21:37,926 INFO L420 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:21:37,926 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:21:37,926 INFO L85 PathProgramCache]: Analyzing trace with hash 929546108, now seen corresponding path program 28 times [2022-11-25 23:21:37,927 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:21:37,927 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1875465632] [2022-11-25 23:21:37,927 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:21:37,927 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:21:37,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:21:38,325 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 56 proven. 65 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-11-25 23:21:38,325 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:21:38,326 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1875465632] [2022-11-25 23:21:38,326 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1875465632] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:21:38,326 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2015076920] [2022-11-25 23:21:38,326 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 23:21:38,326 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:21:38,326 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:21:38,327 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:21:38,350 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2022-11-25 23:21:38,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:21:38,457 INFO L263 TraceCheckSpWp]: Trace formula consists of 236 conjuncts, 24 conjunts are in the unsatisfiable core [2022-11-25 23:21:38,458 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:21:38,763 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 66 proven. 55 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-11-25 23:21:38,763 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:21:39,033 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 66 proven. 55 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-11-25 23:21:39,034 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2015076920] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:21:39,034 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1686644510] [2022-11-25 23:21:39,035 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-25 23:21:39,035 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:21:39,035 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:21:39,035 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:21:39,036 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:21:39,096 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-25 23:21:39,096 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 [2022-11-25 23:21:39,113 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 [2022-11-25 23:21:39,133 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 [2022-11-25 23:21:39,185 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:21:39,186 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:21:39,210 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-25 23:21:39,211 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 [2022-11-25 23:21:39,293 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 [2022-11-25 23:21:39,356 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:21:39,995 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 [2022-11-25 23:21:39,995 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:21:39,996 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:21:39,996 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 37 [2022-11-25 23:21:39,996 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1468263708] [2022-11-25 23:21:39,996 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:21:39,996 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2022-11-25 23:21:39,996 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:21:39,997 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2022-11-25 23:21:39,997 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=363, Invalid=1359, Unknown=0, NotChecked=0, Total=1722 [2022-11-25 23:21:39,997 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) [2022-11-25 23:21:40,419 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:21:40,420 INFO L93 Difference]: Finished difference Result 81 states and 87 transitions. [2022-11-25 23:21:40,420 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-11-25 23:21:40,420 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 [2022-11-25 23:21:40,421 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:21:40,421 INFO L225 Difference]: With dead ends: 81 [2022-11-25 23:21:40,421 INFO L226 Difference]: Without dead ends: 44 [2022-11-25 23:21:40,422 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 [2022-11-25 23:21:40,423 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 11 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 193 mSolverCounterSat, 135 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 328 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 135 IncrementalHoareTripleChecker+Valid, 193 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-25 23:21:40,424 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 17 Invalid, 328 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [135 Valid, 193 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-25 23:21:40,425 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-11-25 23:21:40,469 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 40. [2022-11-25 23:21:40,469 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) [2022-11-25 23:21:40,469 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions. [2022-11-25 23:21:40,470 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 38 [2022-11-25 23:21:40,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:21:40,470 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 42 transitions. [2022-11-25 23:21:40,470 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) [2022-11-25 23:21:40,470 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions. [2022-11-25 23:21:40,470 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-11-25 23:21:40,470 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:21:40,471 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 10, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:21:40,476 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2022-11-25 23:21:40,671 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:21:40,671 INFO L420 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:21:40,671 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:21:40,671 INFO L85 PathProgramCache]: Analyzing trace with hash 1293786012, now seen corresponding path program 29 times [2022-11-25 23:21:40,672 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:21:40,672 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [553010790] [2022-11-25 23:21:40,672 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:21:40,672 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:21:40,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:21:41,022 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 45 proven. 76 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2022-11-25 23:21:41,022 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:21:41,022 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [553010790] [2022-11-25 23:21:41,022 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [553010790] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:21:41,023 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [709505543] [2022-11-25 23:21:41,023 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:21:41,023 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:21:41,023 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:21:41,024 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:21:41,028 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2022-11-25 23:21:41,220 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2022-11-25 23:21:41,220 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:21:41,222 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 24 conjunts are in the unsatisfiable core [2022-11-25 23:21:41,223 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:21:41,469 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 55 proven. 66 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2022-11-25 23:21:41,469 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:21:41,723 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 55 proven. 66 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2022-11-25 23:21:41,723 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [709505543] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:21:41,723 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1917803336] [2022-11-25 23:21:41,725 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-25 23:21:41,725 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:21:41,725 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:21:41,725 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:21:41,725 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:21:41,776 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-25 23:21:41,777 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 [2022-11-25 23:21:41,826 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-25 23:21:41,827 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 [2022-11-25 23:21:41,849 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 [2022-11-25 23:21:41,890 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:21:41,891 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:21:41,913 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-25 23:21:41,914 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 [2022-11-25 23:21:41,992 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-25 23:21:42,044 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:21:42,567 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 [2022-11-25 23:21:42,567 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:21:42,567 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:21:42,567 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 38 [2022-11-25 23:21:42,567 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2071228624] [2022-11-25 23:21:42,567 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:21:42,568 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-11-25 23:21:42,568 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:21:42,568 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-11-25 23:21:42,568 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=361, Invalid=1445, Unknown=0, NotChecked=0, Total=1806 [2022-11-25 23:21:42,568 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) [2022-11-25 23:21:42,994 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:21:42,994 INFO L93 Difference]: Finished difference Result 44 states and 46 transitions. [2022-11-25 23:21:42,995 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-11-25 23:21:42,995 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 [2022-11-25 23:21:42,995 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:21:42,995 INFO L225 Difference]: With dead ends: 44 [2022-11-25 23:21:42,996 INFO L226 Difference]: Without dead ends: 41 [2022-11-25 23:21:42,996 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 67 SyntacticMatches, 33 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1974 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=603, Invalid=2477, Unknown=0, NotChecked=0, Total=3080 [2022-11-25 23:21:42,996 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 14 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 383 mSolverCounterSat, 57 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 440 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 57 IncrementalHoareTripleChecker+Valid, 383 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-25 23:21:42,997 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 21 Invalid, 440 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [57 Valid, 383 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-25 23:21:42,997 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2022-11-25 23:21:43,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2022-11-25 23:21:43,032 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) [2022-11-25 23:21:43,032 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 43 transitions. [2022-11-25 23:21:43,032 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 43 transitions. Word has length 39 [2022-11-25 23:21:43,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:21:43,032 INFO L495 AbstractCegarLoop]: Abstraction has 41 states and 43 transitions. [2022-11-25 23:21:43,033 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) [2022-11-25 23:21:43,033 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 43 transitions. [2022-11-25 23:21:43,033 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-11-25 23:21:43,033 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:21:43,033 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 11, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:21:43,039 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2022-11-25 23:21:43,238 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2022-11-25 23:21:43,239 INFO L420 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:21:43,239 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:21:43,239 INFO L85 PathProgramCache]: Analyzing trace with hash 1452505016, now seen corresponding path program 30 times [2022-11-25 23:21:43,239 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:21:43,239 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2109601708] [2022-11-25 23:21:43,239 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:21:43,239 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:21:43,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:21:48,878 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 15 proven. 183 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:21:48,878 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:21:48,878 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2109601708] [2022-11-25 23:21:48,878 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2109601708] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:21:48,878 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [247806457] [2022-11-25 23:21:48,878 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 23:21:48,878 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:21:48,878 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:21:48,879 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:21:48,886 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2022-11-25 23:21:49,036 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 23:21:49,036 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:21:49,039 INFO L263 TraceCheckSpWp]: Trace formula consists of 248 conjuncts, 98 conjunts are in the unsatisfiable core [2022-11-25 23:21:49,040 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:21:51,743 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2022-11-25 23:21:51,743 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:21:58,264 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-25 23:21:58,265 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 [2022-11-25 23:22:54,871 INFO L321 Elim1Store]: treesize reduction 1276, result has 3.4 percent of original size [2022-11-25 23:22:54,871 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 [2022-11-25 23:22:55,016 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2022-11-25 23:22:55,017 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [247806457] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:22:55,017 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [8094635] [2022-11-25 23:22:55,018 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-25 23:22:55,018 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:22:55,019 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:22:55,019 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:22:55,019 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:22:55,068 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-25 23:22:55,068 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 [2022-11-25 23:22:55,118 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-25 23:22:55,118 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 [2022-11-25 23:22:55,141 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 [2022-11-25 23:22:55,188 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:55,189 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:22:55,212 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-25 23:22:55,212 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 [2022-11-25 23:22:55,293 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 [2022-11-25 23:22:55,342 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:22:56,153 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 [2022-11-25 23:22:56,153 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:22:56,153 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:22:56,153 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 28, 27] total 86 [2022-11-25 23:22:56,153 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1452809448] [2022-11-25 23:22:56,153 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:22:56,154 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 86 states [2022-11-25 23:22:56,154 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:22:56,155 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2022-11-25 23:22:56,155 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=351, Invalid=7839, Unknown=0, NotChecked=0, Total=8190 [2022-11-25 23:22:56,155 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) [2022-11-25 23:23:03,489 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:23:03,490 INFO L93 Difference]: Finished difference Result 61 states and 64 transitions. [2022-11-25 23:23:03,490 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2022-11-25 23:23:03,490 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 [2022-11-25 23:23:03,490 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:23:03,491 INFO L225 Difference]: With dead ends: 61 [2022-11-25 23:23:03,491 INFO L226 Difference]: Without dead ends: 58 [2022-11-25 23:23:03,492 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 186 GetRequests, 66 SyntacticMatches, 2 SemanticMatches, 118 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3160 ImplicationChecksByTransitivity, 14.0s TimeCoverageRelationStatistics Valid=660, Invalid=13620, Unknown=0, NotChecked=0, Total=14280 [2022-11-25 23:23:03,492 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 6 mSDsluCounter, 201 mSDsCounter, 0 mSdLazyCounter, 2146 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 206 SdHoareTripleChecker+Invalid, 2155 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 2146 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2022-11-25 23:23:03,492 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 206 Invalid, 2155 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 2146 Invalid, 0 Unknown, 0 Unchecked, 2.4s Time] [2022-11-25 23:23:03,493 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2022-11-25 23:23:03,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 43. [2022-11-25 23:23:03,531 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) [2022-11-25 23:23:03,531 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 46 transitions. [2022-11-25 23:23:03,531 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 46 transitions. Word has length 40 [2022-11-25 23:23:03,532 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:23:03,532 INFO L495 AbstractCegarLoop]: Abstraction has 43 states and 46 transitions. [2022-11-25 23:23:03,532 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) [2022-11-25 23:23:03,532 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 46 transitions. [2022-11-25 23:23:03,532 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-11-25 23:23:03,532 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:23:03,533 INFO L195 NwaCegarLoop]: trace histogram [12, 11, 11, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:23:03,537 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2022-11-25 23:23:03,733 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:23:03,733 INFO L420 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:23:03,734 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:23:03,734 INFO L85 PathProgramCache]: Analyzing trace with hash 1553179725, now seen corresponding path program 31 times [2022-11-25 23:23:03,734 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:23:03,734 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [570329030] [2022-11-25 23:23:03,734 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:23:03,734 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:23:03,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:23:04,144 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 67 proven. 77 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2022-11-25 23:23:04,144 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:23:04,144 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [570329030] [2022-11-25 23:23:04,144 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [570329030] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:23:04,144 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [136737101] [2022-11-25 23:23:04,144 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 23:23:04,144 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:23:04,145 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:23:04,147 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:23:04,166 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2022-11-25 23:23:04,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:23:04,280 INFO L263 TraceCheckSpWp]: Trace formula consists of 253 conjuncts, 26 conjunts are in the unsatisfiable core [2022-11-25 23:23:04,282 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:23:04,677 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 78 proven. 66 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2022-11-25 23:23:04,677 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:23:04,992 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 78 proven. 66 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2022-11-25 23:23:04,992 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [136737101] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:23:04,992 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1249325958] [2022-11-25 23:23:04,994 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-25 23:23:04,994 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:23:04,994 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:23:04,994 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:23:04,994 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:23:05,050 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-25 23:23:05,050 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 [2022-11-25 23:23:05,105 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-25 23:23:05,106 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 [2022-11-25 23:23:05,129 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 [2022-11-25 23:23:05,182 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:23:05,183 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:23:05,207 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-25 23:23:05,208 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 [2022-11-25 23:23:05,256 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 [2022-11-25 23:23:05,306 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:23:06,023 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 [2022-11-25 23:23:06,024 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:23:06,024 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:23:06,024 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 40 [2022-11-25 23:23:06,024 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1004871743] [2022-11-25 23:23:06,024 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:23:06,025 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-11-25 23:23:06,025 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:23:06,025 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-11-25 23:23:06,026 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=418, Invalid=1562, Unknown=0, NotChecked=0, Total=1980 [2022-11-25 23:23:06,026 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) [2022-11-25 23:23:06,501 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:23:06,501 INFO L93 Difference]: Finished difference Result 87 states and 93 transitions. [2022-11-25 23:23:06,501 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-11-25 23:23:06,502 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 [2022-11-25 23:23:06,502 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:23:06,502 INFO L225 Difference]: With dead ends: 87 [2022-11-25 23:23:06,502 INFO L226 Difference]: Without dead ends: 47 [2022-11-25 23:23:06,503 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 [2022-11-25 23:23:06,503 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 11 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 204 mSolverCounterSat, 166 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 370 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 166 IncrementalHoareTripleChecker+Valid, 204 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-25 23:23:06,503 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 17 Invalid, 370 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [166 Valid, 204 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-25 23:23:06,504 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2022-11-25 23:23:06,541 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 43. [2022-11-25 23:23:06,541 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) [2022-11-25 23:23:06,542 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 45 transitions. [2022-11-25 23:23:06,542 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 45 transitions. Word has length 41 [2022-11-25 23:23:06,542 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:23:06,542 INFO L495 AbstractCegarLoop]: Abstraction has 43 states and 45 transitions. [2022-11-25 23:23:06,542 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) [2022-11-25 23:23:06,542 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 45 transitions. [2022-11-25 23:23:06,542 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2022-11-25 23:23:06,543 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:23:06,543 INFO L195 NwaCegarLoop]: trace histogram [12, 12, 11, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:23:06,551 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2022-11-25 23:23:06,743 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:23:06,743 INFO L420 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:23:06,743 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:23:06,744 INFO L85 PathProgramCache]: Analyzing trace with hash -758197203, now seen corresponding path program 32 times [2022-11-25 23:23:06,744 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:23:06,744 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1251468024] [2022-11-25 23:23:06,744 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:23:06,744 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:23:06,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:23:07,231 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 55 proven. 89 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2022-11-25 23:23:07,231 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:23:07,231 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1251468024] [2022-11-25 23:23:07,231 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1251468024] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:23:07,231 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1478603735] [2022-11-25 23:23:07,232 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:23:07,232 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:23:07,232 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:23:07,233 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:23:07,254 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2022-11-25 23:23:07,480 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2022-11-25 23:23:07,480 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:23:07,482 INFO L263 TraceCheckSpWp]: Trace formula consists of 260 conjuncts, 26 conjunts are in the unsatisfiable core [2022-11-25 23:23:07,483 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:23:07,763 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 66 proven. 78 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2022-11-25 23:23:07,763 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:23:08,057 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 66 proven. 78 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2022-11-25 23:23:08,057 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1478603735] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:23:08,058 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1602320961] [2022-11-25 23:23:08,059 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-25 23:23:08,059 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:23:08,059 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:23:08,059 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:23:08,060 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:23:08,116 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-25 23:23:08,116 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 [2022-11-25 23:23:08,169 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-25 23:23:08,169 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 [2022-11-25 23:23:08,186 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 [2022-11-25 23:23:08,227 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:23:08,229 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:23:08,241 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-25 23:23:08,242 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 [2022-11-25 23:23:08,283 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 [2022-11-25 23:23:08,325 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:23:08,583 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 [2022-11-25 23:23:08,583 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:23:08,583 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:23:08,584 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 41 [2022-11-25 23:23:08,584 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [563054842] [2022-11-25 23:23:08,584 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:23:08,585 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2022-11-25 23:23:08,585 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:23:08,585 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2022-11-25 23:23:08,586 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=415, Invalid=1655, Unknown=0, NotChecked=0, Total=2070 [2022-11-25 23:23:08,586 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) [2022-11-25 23:23:09,036 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:23:09,036 INFO L93 Difference]: Finished difference Result 47 states and 49 transitions. [2022-11-25 23:23:09,036 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-11-25 23:23:09,036 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 [2022-11-25 23:23:09,037 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:23:09,037 INFO L225 Difference]: With dead ends: 47 [2022-11-25 23:23:09,037 INFO L226 Difference]: Without dead ends: 44 [2022-11-25 23:23:09,037 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 [2022-11-25 23:23:09,038 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 14 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 316 mSolverCounterSat, 91 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 407 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 91 IncrementalHoareTripleChecker+Valid, 316 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-25 23:23:09,038 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 13 Invalid, 407 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [91 Valid, 316 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-25 23:23:09,038 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-11-25 23:23:09,076 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2022-11-25 23:23:09,077 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) [2022-11-25 23:23:09,077 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2022-11-25 23:23:09,077 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 42 [2022-11-25 23:23:09,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:23:09,077 INFO L495 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2022-11-25 23:23:09,077 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) [2022-11-25 23:23:09,077 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2022-11-25 23:23:09,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-11-25 23:23:09,078 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:23:09,078 INFO L195 NwaCegarLoop]: trace histogram [12, 12, 12, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:23:09,083 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2022-11-25 23:23:09,278 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2022-11-25 23:23:09,278 INFO L420 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:23:09,279 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:23:09,279 INFO L85 PathProgramCache]: Analyzing trace with hash -2029432505, now seen corresponding path program 33 times [2022-11-25 23:23:09,279 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:23:09,279 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2106000182] [2022-11-25 23:23:09,279 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:23:09,279 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:23:09,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:23:16,625 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 36 proven. 198 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:23:16,625 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:23:16,625 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2106000182] [2022-11-25 23:23:16,625 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2106000182] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:23:16,625 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1073086381] [2022-11-25 23:23:16,625 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 23:23:16,625 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:23:16,625 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:23:16,626 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:23:16,629 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2022-11-25 23:23:16,801 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 23:23:16,802 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:23:16,805 INFO L263 TraceCheckSpWp]: Trace formula consists of 265 conjuncts, 110 conjunts are in the unsatisfiable core [2022-11-25 23:23:16,808 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:23:16,905 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 [2022-11-25 23:23:20,050 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2022-11-25 23:23:20,051 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:23:25,167 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2022-11-25 23:23:25,167 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1073086381] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:23:25,167 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [305528659] [2022-11-25 23:23:25,168 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-25 23:23:25,168 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:23:25,169 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:23:25,169 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:23:25,169 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:23:25,229 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-25 23:23:25,229 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 [2022-11-25 23:23:25,240 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 [2022-11-25 23:23:25,257 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 [2022-11-25 23:23:25,305 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:23:25,306 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:23:25,332 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-25 23:23:25,332 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 [2022-11-25 23:23:25,404 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 [2022-11-25 23:23:25,459 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:23:28,118 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 [2022-11-25 23:23:28,118 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:23:28,118 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:23:28,119 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 30, 29] total 93 [2022-11-25 23:23:28,119 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1168949402] [2022-11-25 23:23:28,119 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:23:28,119 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 93 states [2022-11-25 23:23:28,119 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:23:28,120 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 93 interpolants. [2022-11-25 23:23:28,120 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=439, Invalid=9067, Unknown=0, NotChecked=0, Total=9506 [2022-11-25 23:23:28,121 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) [2022-11-25 23:23:37,117 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:23:37,117 INFO L93 Difference]: Finished difference Result 65 states and 68 transitions. [2022-11-25 23:23:37,118 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2022-11-25 23:23:37,118 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 [2022-11-25 23:23:37,118 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:23:37,118 INFO L225 Difference]: With dead ends: 65 [2022-11-25 23:23:37,118 INFO L226 Difference]: Without dead ends: 62 [2022-11-25 23:23:37,119 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 202 GetRequests, 58 SyntacticMatches, 15 SemanticMatches, 129 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5099 ImplicationChecksByTransitivity, 19.1s TimeCoverageRelationStatistics Valid=879, Invalid=16151, Unknown=0, NotChecked=0, Total=17030 [2022-11-25 23:23:37,120 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 22 mSDsluCounter, 188 mSDsCounter, 0 mSdLazyCounter, 2162 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 193 SdHoareTripleChecker+Invalid, 2195 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 2162 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.8s IncrementalHoareTripleChecker+Time [2022-11-25 23:23:37,120 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [22 Valid, 193 Invalid, 2195 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 2162 Invalid, 0 Unknown, 0 Unchecked, 2.8s Time] [2022-11-25 23:23:37,120 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2022-11-25 23:23:37,179 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 46. [2022-11-25 23:23:37,179 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) [2022-11-25 23:23:37,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 49 transitions. [2022-11-25 23:23:37,179 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 49 transitions. Word has length 43 [2022-11-25 23:23:37,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:23:37,180 INFO L495 AbstractCegarLoop]: Abstraction has 46 states and 49 transitions. [2022-11-25 23:23:37,180 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) [2022-11-25 23:23:37,180 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 49 transitions. [2022-11-25 23:23:37,180 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-11-25 23:23:37,180 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:23:37,180 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:23:37,185 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2022-11-25 23:23:37,381 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2022-11-25 23:23:37,381 INFO L420 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:23:37,381 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:23:37,381 INFO L85 PathProgramCache]: Analyzing trace with hash -1867212708, now seen corresponding path program 34 times [2022-11-25 23:23:37,381 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:23:37,381 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1251828966] [2022-11-25 23:23:37,382 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:23:37,382 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:23:37,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:23:37,871 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 79 proven. 90 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2022-11-25 23:23:37,871 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:23:37,871 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1251828966] [2022-11-25 23:23:37,871 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1251828966] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:23:37,871 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1633207688] [2022-11-25 23:23:37,872 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 23:23:37,872 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:23:37,872 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:23:37,873 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:23:37,883 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2022-11-25 23:23:38,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:23:38,026 INFO L263 TraceCheckSpWp]: Trace formula consists of 270 conjuncts, 28 conjunts are in the unsatisfiable core [2022-11-25 23:23:38,027 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:23:38,467 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 91 proven. 78 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2022-11-25 23:23:38,468 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:23:38,770 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 91 proven. 78 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2022-11-25 23:23:38,771 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1633207688] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:23:38,771 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1832539362] [2022-11-25 23:23:38,772 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-25 23:23:38,772 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:23:38,772 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:23:38,772 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:23:38,772 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:23:38,819 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-25 23:23:38,820 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 [2022-11-25 23:23:38,869 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-25 23:23:38,870 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 [2022-11-25 23:23:38,890 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 [2022-11-25 23:23:38,929 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:23:38,931 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:23:38,943 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-25 23:23:38,944 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 [2022-11-25 23:23:38,987 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-25 23:23:39,046 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:23:39,818 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 [2022-11-25 23:23:39,818 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:23:39,818 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:23:39,818 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 43 [2022-11-25 23:23:39,818 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1421229155] [2022-11-25 23:23:39,818 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:23:39,819 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2022-11-25 23:23:39,819 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:23:39,819 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2022-11-25 23:23:39,820 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=477, Invalid=1779, Unknown=0, NotChecked=0, Total=2256 [2022-11-25 23:23:39,820 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) [2022-11-25 23:23:40,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:23:40,320 INFO L93 Difference]: Finished difference Result 93 states and 99 transitions. [2022-11-25 23:23:40,321 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-11-25 23:23:40,322 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 [2022-11-25 23:23:40,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:23:40,322 INFO L225 Difference]: With dead ends: 93 [2022-11-25 23:23:40,322 INFO L226 Difference]: Without dead ends: 50 [2022-11-25 23:23:40,323 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 [2022-11-25 23:23:40,323 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 15 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 258 mSolverCounterSat, 137 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 395 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 137 IncrementalHoareTripleChecker+Valid, 258 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-25 23:23:40,324 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 19 Invalid, 395 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [137 Valid, 258 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-25 23:23:40,324 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2022-11-25 23:23:40,367 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 46. [2022-11-25 23:23:40,367 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) [2022-11-25 23:23:40,367 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 48 transitions. [2022-11-25 23:23:40,368 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 48 transitions. Word has length 44 [2022-11-25 23:23:40,368 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:23:40,368 INFO L495 AbstractCegarLoop]: Abstraction has 46 states and 48 transitions. [2022-11-25 23:23:40,368 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) [2022-11-25 23:23:40,368 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 48 transitions. [2022-11-25 23:23:40,368 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2022-11-25 23:23:40,368 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:23:40,369 INFO L195 NwaCegarLoop]: trace histogram [13, 13, 12, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:23:40,373 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2022-11-25 23:23:40,569 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35,35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:23:40,569 INFO L420 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:23:40,569 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:23:40,569 INFO L85 PathProgramCache]: Analyzing trace with hash 1113382012, now seen corresponding path program 35 times [2022-11-25 23:23:40,570 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:23:40,570 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1248766378] [2022-11-25 23:23:40,570 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:23:40,570 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:23:40,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:23:40,998 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 66 proven. 103 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2022-11-25 23:23:40,998 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:23:40,999 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1248766378] [2022-11-25 23:23:40,999 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1248766378] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:23:40,999 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1457245600] [2022-11-25 23:23:40,999 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:23:40,999 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:23:40,999 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:23:41,000 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:23:41,002 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2022-11-25 23:23:41,285 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2022-11-25 23:23:41,285 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:23:41,287 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 28 conjunts are in the unsatisfiable core [2022-11-25 23:23:41,288 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:23:41,600 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 78 proven. 91 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2022-11-25 23:23:41,600 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:23:41,930 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 78 proven. 91 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2022-11-25 23:23:41,930 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1457245600] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:23:41,930 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1610001866] [2022-11-25 23:23:41,931 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-25 23:23:41,931 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:23:41,931 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:23:41,931 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:23:41,931 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:23:41,989 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-25 23:23:41,989 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 [2022-11-25 23:23:42,040 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-25 23:23:42,040 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 [2022-11-25 23:23:42,059 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 [2022-11-25 23:23:42,098 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:23:42,101 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:23:42,112 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-25 23:23:42,113 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 [2022-11-25 23:23:42,155 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 [2022-11-25 23:23:42,195 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:23:42,451 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 [2022-11-25 23:23:42,451 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:23:42,451 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:23:42,451 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 44 [2022-11-25 23:23:42,451 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1660287294] [2022-11-25 23:23:42,451 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:23:42,452 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2022-11-25 23:23:42,452 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:23:42,453 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2022-11-25 23:23:42,453 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=473, Invalid=1879, Unknown=0, NotChecked=0, Total=2352 [2022-11-25 23:23:42,453 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) [2022-11-25 23:23:42,935 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:23:42,935 INFO L93 Difference]: Finished difference Result 50 states and 52 transitions. [2022-11-25 23:23:42,936 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-11-25 23:23:42,936 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 [2022-11-25 23:23:42,936 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:23:42,936 INFO L225 Difference]: With dead ends: 50 [2022-11-25 23:23:42,937 INFO L226 Difference]: Without dead ends: 47 [2022-11-25 23:23:42,937 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 90 SyntacticMatches, 26 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1970 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=796, Invalid=3236, Unknown=0, NotChecked=0, Total=4032 [2022-11-25 23:23:42,937 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 20 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 305 mSolverCounterSat, 90 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 395 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 90 IncrementalHoareTripleChecker+Valid, 305 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-25 23:23:42,938 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 11 Invalid, 395 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [90 Valid, 305 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-25 23:23:42,938 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2022-11-25 23:23:42,980 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2022-11-25 23:23:42,981 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) [2022-11-25 23:23:42,981 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 49 transitions. [2022-11-25 23:23:42,981 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 49 transitions. Word has length 45 [2022-11-25 23:23:42,981 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:23:42,981 INFO L495 AbstractCegarLoop]: Abstraction has 47 states and 49 transitions. [2022-11-25 23:23:42,981 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) [2022-11-25 23:23:42,981 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 49 transitions. [2022-11-25 23:23:42,982 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-11-25 23:23:42,982 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:23:42,982 INFO L195 NwaCegarLoop]: trace histogram [13, 13, 13, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:23:42,991 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2022-11-25 23:23:43,182 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2022-11-25 23:23:43,183 INFO L420 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:23:43,183 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:23:43,183 INFO L85 PathProgramCache]: Analyzing trace with hash 154948312, now seen corresponding path program 36 times [2022-11-25 23:23:43,183 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:23:43,183 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1309522710] [2022-11-25 23:23:43,183 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:23:43,183 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:23:43,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:23:52,484 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 45 proven. 228 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:23:52,485 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:23:52,485 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1309522710] [2022-11-25 23:23:52,485 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1309522710] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:23:52,485 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1447490079] [2022-11-25 23:23:52,485 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 23:23:52,485 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:23:52,485 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:23:52,486 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:23:52,489 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2022-11-25 23:23:52,679 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 23:23:52,679 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:23:52,683 INFO L263 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 116 conjunts are in the unsatisfiable core [2022-11-25 23:23:52,684 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:23:52,781 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 [2022-11-25 23:23:56,256 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2022-11-25 23:23:56,256 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:24:01,499 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2022-11-25 23:24:01,499 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1447490079] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:24:01,500 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [425255382] [2022-11-25 23:24:01,501 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-25 23:24:01,501 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:24:01,501 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:24:01,501 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:24:01,501 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:24:01,558 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-25 23:24:01,559 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 [2022-11-25 23:24:01,568 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 [2022-11-25 23:24:01,583 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 [2022-11-25 23:24:01,625 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:24:01,625 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:24:01,648 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-25 23:24:01,648 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 [2022-11-25 23:24:01,694 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 [2022-11-25 23:24:01,741 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:24:04,417 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 [2022-11-25 23:24:04,417 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:24:04,417 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:24:04,417 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 32, 31] total 100 [2022-11-25 23:24:04,418 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [305915315] [2022-11-25 23:24:04,418 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:24:04,418 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 100 states [2022-11-25 23:24:04,418 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:24:04,419 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 100 interpolants. [2022-11-25 23:24:04,420 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=541, Invalid=10379, Unknown=0, NotChecked=0, Total=10920 [2022-11-25 23:24:04,420 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) [2022-11-25 23:24:14,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:24:14,065 INFO L93 Difference]: Finished difference Result 69 states and 72 transitions. [2022-11-25 23:24:14,066 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2022-11-25 23:24:14,066 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 [2022-11-25 23:24:14,066 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:24:14,067 INFO L225 Difference]: With dead ends: 69 [2022-11-25 23:24:14,067 INFO L226 Difference]: Without dead ends: 66 [2022-11-25 23:24:14,068 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 209 GetRequests, 62 SyntacticMatches, 16 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6578 ImplicationChecksByTransitivity, 20.0s TimeCoverageRelationStatistics Valid=966, Invalid=16590, Unknown=0, NotChecked=0, Total=17556 [2022-11-25 23:24:14,068 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 9 mSDsluCounter, 235 mSDsCounter, 0 mSdLazyCounter, 2727 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 240 SdHoareTripleChecker+Invalid, 2743 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 2727 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.5s IncrementalHoareTripleChecker+Time [2022-11-25 23:24:14,069 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 240 Invalid, 2743 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 2727 Invalid, 0 Unknown, 0 Unchecked, 3.5s Time] [2022-11-25 23:24:14,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2022-11-25 23:24:14,122 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 49. [2022-11-25 23:24:14,123 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) [2022-11-25 23:24:14,123 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 52 transitions. [2022-11-25 23:24:14,123 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 52 transitions. Word has length 46 [2022-11-25 23:24:14,123 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:24:14,123 INFO L495 AbstractCegarLoop]: Abstraction has 49 states and 52 transitions. [2022-11-25 23:24:14,123 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) [2022-11-25 23:24:14,123 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 52 transitions. [2022-11-25 23:24:14,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-11-25 23:24:14,124 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:24:14,124 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 13, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:24:14,130 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Forceful destruction successful, exit code 0 [2022-11-25 23:24:14,324 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2022-11-25 23:24:14,325 INFO L420 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:24:14,325 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:24:14,325 INFO L85 PathProgramCache]: Analyzing trace with hash -1166433043, now seen corresponding path program 37 times [2022-11-25 23:24:14,325 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:24:14,325 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [86961095] [2022-11-25 23:24:14,325 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:24:14,326 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:24:14,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:24:14,784 INFO L134 CoverageAnalysis]: Checked inductivity of 287 backedges. 92 proven. 104 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2022-11-25 23:24:14,785 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:24:14,785 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [86961095] [2022-11-25 23:24:14,785 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [86961095] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:24:14,785 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2033407035] [2022-11-25 23:24:14,785 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 23:24:14,785 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:24:14,785 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:24:14,786 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:24:14,791 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2022-11-25 23:24:14,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:24:14,932 INFO L263 TraceCheckSpWp]: Trace formula consists of 287 conjuncts, 30 conjunts are in the unsatisfiable core [2022-11-25 23:24:14,933 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:24:15,371 INFO L134 CoverageAnalysis]: Checked inductivity of 287 backedges. 105 proven. 91 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2022-11-25 23:24:15,371 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:24:15,739 INFO L134 CoverageAnalysis]: Checked inductivity of 287 backedges. 105 proven. 91 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2022-11-25 23:24:15,740 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2033407035] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:24:15,740 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [216431130] [2022-11-25 23:24:15,741 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-25 23:24:15,741 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:24:15,741 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:24:15,741 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:24:15,741 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:24:15,802 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-25 23:24:15,802 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 [2022-11-25 23:24:15,854 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-25 23:24:15,854 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 [2022-11-25 23:24:15,875 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 [2022-11-25 23:24:15,913 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:24:15,914 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:24:15,937 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-25 23:24:15,938 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 [2022-11-25 23:24:16,001 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 [2022-11-25 23:24:16,056 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:24:16,903 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 [2022-11-25 23:24:16,903 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:24:16,903 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:24:16,903 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 46 [2022-11-25 23:24:16,903 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [191410993] [2022-11-25 23:24:16,903 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:24:16,903 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2022-11-25 23:24:16,904 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:24:16,904 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2022-11-25 23:24:16,904 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=540, Invalid=2010, Unknown=0, NotChecked=0, Total=2550 [2022-11-25 23:24:16,905 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) [2022-11-25 23:24:17,464 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:24:17,464 INFO L93 Difference]: Finished difference Result 99 states and 105 transitions. [2022-11-25 23:24:17,465 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2022-11-25 23:24:17,465 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 [2022-11-25 23:24:17,465 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:24:17,465 INFO L225 Difference]: With dead ends: 99 [2022-11-25 23:24:17,465 INFO L226 Difference]: Without dead ends: 53 [2022-11-25 23:24:17,466 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 [2022-11-25 23:24:17,466 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 7 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 267 mSolverCounterSat, 173 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 440 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 173 IncrementalHoareTripleChecker+Valid, 267 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-25 23:24:17,467 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 17 Invalid, 440 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [173 Valid, 267 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-25 23:24:17,467 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2022-11-25 23:24:17,520 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 49. [2022-11-25 23:24:17,520 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) [2022-11-25 23:24:17,520 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 51 transitions. [2022-11-25 23:24:17,520 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 51 transitions. Word has length 47 [2022-11-25 23:24:17,521 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:24:17,521 INFO L495 AbstractCegarLoop]: Abstraction has 49 states and 51 transitions. [2022-11-25 23:24:17,521 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) [2022-11-25 23:24:17,521 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 51 transitions. [2022-11-25 23:24:17,522 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-11-25 23:24:17,522 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:24:17,522 INFO L195 NwaCegarLoop]: trace histogram [14, 14, 13, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:24:17,531 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Ended with exit code 0 [2022-11-25 23:24:17,728 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2022-11-25 23:24:17,728 INFO L420 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:24:17,728 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:24:17,728 INFO L85 PathProgramCache]: Analyzing trace with hash -423007027, now seen corresponding path program 38 times [2022-11-25 23:24:17,728 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:24:17,729 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1297054746] [2022-11-25 23:24:17,729 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:24:17,729 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:24:17,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:24:18,225 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 78 proven. 118 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2022-11-25 23:24:18,225 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:24:18,225 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1297054746] [2022-11-25 23:24:18,225 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1297054746] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:24:18,225 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1484496565] [2022-11-25 23:24:18,226 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:24:18,226 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:24:18,226 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:24:18,227 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:24:18,229 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2022-11-25 23:24:18,493 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2022-11-25 23:24:18,493 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:24:18,495 INFO L263 TraceCheckSpWp]: Trace formula consists of 294 conjuncts, 30 conjunts are in the unsatisfiable core [2022-11-25 23:24:18,496 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:24:18,854 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 91 proven. 105 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2022-11-25 23:24:18,854 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:24:19,225 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 91 proven. 105 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2022-11-25 23:24:19,225 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1484496565] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:24:19,225 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2047257238] [2022-11-25 23:24:19,226 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-25 23:24:19,227 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:24:19,227 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:24:19,227 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:24:19,227 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:24:19,278 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-25 23:24:19,278 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 [2022-11-25 23:24:19,327 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-25 23:24:19,327 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 [2022-11-25 23:24:19,346 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 [2022-11-25 23:24:19,389 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:24:19,391 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:24:19,403 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-25 23:24:19,404 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 [2022-11-25 23:24:19,444 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 [2022-11-25 23:24:19,486 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:24:19,747 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 [2022-11-25 23:24:19,747 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:24:19,747 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:24:19,748 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 47 [2022-11-25 23:24:19,748 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [167189021] [2022-11-25 23:24:19,748 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:24:19,748 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2022-11-25 23:24:19,748 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:24:19,749 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2022-11-25 23:24:19,749 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=535, Invalid=2117, Unknown=0, NotChecked=0, Total=2652 [2022-11-25 23:24:19,749 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) [2022-11-25 23:24:20,276 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:24:20,276 INFO L93 Difference]: Finished difference Result 53 states and 55 transitions. [2022-11-25 23:24:20,277 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-11-25 23:24:20,277 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 [2022-11-25 23:24:20,277 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:24:20,277 INFO L225 Difference]: With dead ends: 53 [2022-11-25 23:24:20,278 INFO L226 Difference]: Without dead ends: 50 [2022-11-25 23:24:20,278 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 [2022-11-25 23:24:20,279 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 14 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 349 mSolverCounterSat, 104 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 453 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 104 IncrementalHoareTripleChecker+Valid, 349 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-25 23:24:20,279 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 17 Invalid, 453 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [104 Valid, 349 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-25 23:24:20,280 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2022-11-25 23:24:20,337 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2022-11-25 23:24:20,337 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) [2022-11-25 23:24:20,338 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 52 transitions. [2022-11-25 23:24:20,338 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 52 transitions. Word has length 48 [2022-11-25 23:24:20,338 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:24:20,338 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 52 transitions. [2022-11-25 23:24:20,338 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) [2022-11-25 23:24:20,338 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 52 transitions. [2022-11-25 23:24:20,338 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-11-25 23:24:20,339 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:24:20,339 INFO L195 NwaCegarLoop]: trace histogram [14, 14, 14, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:24:20,347 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Forceful destruction successful, exit code 0 [2022-11-25 23:24:20,545 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2022-11-25 23:24:20,545 INFO L420 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:24:20,545 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:24:20,546 INFO L85 PathProgramCache]: Analyzing trace with hash -228471641, now seen corresponding path program 39 times [2022-11-25 23:24:20,546 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:24:20,546 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1031372690] [2022-11-25 23:24:20,546 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:24:20,546 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:24:20,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:24:26,487 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 0 proven. 315 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:24:26,487 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:24:26,488 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1031372690] [2022-11-25 23:24:26,488 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1031372690] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:24:26,488 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1101569014] [2022-11-25 23:24:26,488 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 23:24:26,488 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:24:26,488 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:24:26,489 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:24:26,492 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2022-11-25 23:24:26,679 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 23:24:26,679 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:24:26,683 INFO L263 TraceCheckSpWp]: Trace formula consists of 299 conjuncts, 122 conjunts are in the unsatisfiable core [2022-11-25 23:24:26,684 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:24:31,094 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2022-11-25 23:24:31,094 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:24:45,164 WARN L233 SmtUtils]: Spent 6.39s 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) [2022-11-25 23:24:45,165 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-25 23:24:45,166 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 [2022-11-25 23:26:32,249 INFO L321 Elim1Store]: treesize reduction 2086, result has 2.7 percent of original size [2022-11-25 23:26:32,249 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 [2022-11-25 23:26:32,436 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2022-11-25 23:26:32,436 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1101569014] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:26:32,436 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [415545771] [2022-11-25 23:26:32,439 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-25 23:26:32,439 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:26:32,440 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:26:32,440 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:26:32,440 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:26:32,493 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-25 23:26:32,494 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 [2022-11-25 23:26:32,503 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 [2022-11-25 23:26:32,520 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 [2022-11-25 23:26:32,563 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:26:32,565 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:26:32,577 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-25 23:26:32,577 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 [2022-11-25 23:26:32,622 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 [2022-11-25 23:26:32,667 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:26:33,710 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 [2022-11-25 23:26:33,711 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:26:33,711 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:26:33,711 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 34, 33] total 107 [2022-11-25 23:26:33,711 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [186334097] [2022-11-25 23:26:33,711 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:26:33,711 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 107 states [2022-11-25 23:26:33,711 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:26:33,712 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 107 interpolants. [2022-11-25 23:26:33,713 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=428, Invalid=12004, Unknown=0, NotChecked=0, Total=12432 [2022-11-25 23:26:33,714 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) [2022-11-25 23:26:41,281 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:26:41,282 INFO L93 Difference]: Finished difference Result 69 states and 72 transitions. [2022-11-25 23:26:41,282 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2022-11-25 23:26:41,282 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 [2022-11-25 23:26:41,282 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:26:41,283 INFO L225 Difference]: With dead ends: 69 [2022-11-25 23:26:41,283 INFO L226 Difference]: Without dead ends: 66 [2022-11-25 23:26:41,284 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 81 SyntacticMatches, 2 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2921 ImplicationChecksByTransitivity, 19.1s TimeCoverageRelationStatistics Valid=616, Invalid=16154, Unknown=0, NotChecked=0, Total=16770 [2022-11-25 23:26:41,284 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 3 mSDsluCounter, 104 mSDsCounter, 0 mSdLazyCounter, 2803 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 107 SdHoareTripleChecker+Invalid, 2808 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 2803 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.6s IncrementalHoareTripleChecker+Time [2022-11-25 23:26:41,284 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 107 Invalid, 2808 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 2803 Invalid, 0 Unknown, 0 Unchecked, 3.6s Time] [2022-11-25 23:26:41,287 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2022-11-25 23:26:41,360 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 52. [2022-11-25 23:26:41,361 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) [2022-11-25 23:26:41,361 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 55 transitions. [2022-11-25 23:26:41,361 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 55 transitions. Word has length 49 [2022-11-25 23:26:41,361 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:26:41,361 INFO L495 AbstractCegarLoop]: Abstraction has 52 states and 55 transitions. [2022-11-25 23:26:41,361 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) [2022-11-25 23:26:41,361 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 55 transitions. [2022-11-25 23:26:41,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-11-25 23:26:41,362 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:26:41,362 INFO L195 NwaCegarLoop]: trace histogram [15, 14, 14, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:26:41,367 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Forceful destruction successful, exit code 0 [2022-11-25 23:26:41,562 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable40 [2022-11-25 23:26:41,562 INFO L420 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:26:41,563 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:26:41,563 INFO L85 PathProgramCache]: Analyzing trace with hash 1130826044, now seen corresponding path program 40 times [2022-11-25 23:26:41,563 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:26:41,563 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [461026902] [2022-11-25 23:26:41,563 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:26:41,563 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:26:41,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:26:42,143 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 106 proven. 119 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2022-11-25 23:26:42,143 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:26:42,143 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [461026902] [2022-11-25 23:26:42,144 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [461026902] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:26:42,144 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [246014709] [2022-11-25 23:26:42,144 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 23:26:42,144 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:26:42,144 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:26:42,145 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:26:42,147 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2022-11-25 23:26:42,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:26:42,314 INFO L263 TraceCheckSpWp]: Trace formula consists of 304 conjuncts, 32 conjunts are in the unsatisfiable core [2022-11-25 23:26:42,316 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:26:42,834 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 120 proven. 105 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2022-11-25 23:26:42,834 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:26:43,225 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 120 proven. 105 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2022-11-25 23:26:43,225 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [246014709] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:26:43,225 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1735689653] [2022-11-25 23:26:43,227 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-25 23:26:43,227 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:26:43,227 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:26:43,227 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:26:43,227 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:26:43,277 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-25 23:26:43,277 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 [2022-11-25 23:26:43,327 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-25 23:26:43,328 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 [2022-11-25 23:26:43,347 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 [2022-11-25 23:26:43,387 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:26:43,388 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:26:43,411 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-25 23:26:43,411 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 [2022-11-25 23:26:43,501 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 [2022-11-25 23:26:43,547 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:26:43,884 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 [2022-11-25 23:26:43,884 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:26:43,885 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:26:43,885 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 49 [2022-11-25 23:26:43,885 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [303098686] [2022-11-25 23:26:43,885 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:26:43,885 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2022-11-25 23:26:43,885 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:26:43,886 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2022-11-25 23:26:43,887 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=607, Invalid=2255, Unknown=0, NotChecked=0, Total=2862 [2022-11-25 23:26:43,887 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) [2022-11-25 23:26:44,519 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:26:44,519 INFO L93 Difference]: Finished difference Result 105 states and 111 transitions. [2022-11-25 23:26:44,519 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-11-25 23:26:44,519 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 [2022-11-25 23:26:44,519 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:26:44,520 INFO L225 Difference]: With dead ends: 105 [2022-11-25 23:26:44,520 INFO L226 Difference]: Without dead ends: 56 [2022-11-25 23:26:44,520 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 [2022-11-25 23:26:44,520 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 15 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 310 mSolverCounterSat, 196 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 506 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 196 IncrementalHoareTripleChecker+Valid, 310 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-25 23:26:44,521 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 19 Invalid, 506 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [196 Valid, 310 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-25 23:26:44,521 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2022-11-25 23:26:44,579 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 52. [2022-11-25 23:26:44,579 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) [2022-11-25 23:26:44,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 54 transitions. [2022-11-25 23:26:44,580 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 54 transitions. Word has length 50 [2022-11-25 23:26:44,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:26:44,580 INFO L495 AbstractCegarLoop]: Abstraction has 52 states and 54 transitions. [2022-11-25 23:26:44,580 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) [2022-11-25 23:26:44,580 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 54 transitions. [2022-11-25 23:26:44,580 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2022-11-25 23:26:44,580 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:26:44,581 INFO L195 NwaCegarLoop]: trace histogram [15, 15, 14, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:26:44,586 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Forceful destruction successful, exit code 0 [2022-11-25 23:26:44,781 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable41 [2022-11-25 23:26:44,781 INFO L420 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:26:44,781 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:26:44,782 INFO L85 PathProgramCache]: Analyzing trace with hash -611076772, now seen corresponding path program 41 times [2022-11-25 23:26:44,782 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:26:44,782 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1570674296] [2022-11-25 23:26:44,782 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:26:44,782 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:26:44,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:26:45,335 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 91 proven. 134 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2022-11-25 23:26:45,335 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:26:45,336 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1570674296] [2022-11-25 23:26:45,336 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1570674296] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:26:45,336 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [489027948] [2022-11-25 23:26:45,336 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:26:45,336 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:26:45,337 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:26:45,339 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:26:45,349 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2022-11-25 23:26:45,717 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2022-11-25 23:26:45,717 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:26:45,720 INFO L263 TraceCheckSpWp]: Trace formula consists of 311 conjuncts, 32 conjunts are in the unsatisfiable core [2022-11-25 23:26:45,721 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:26:46,149 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 105 proven. 120 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2022-11-25 23:26:46,149 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:26:46,598 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 105 proven. 120 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2022-11-25 23:26:46,599 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [489027948] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:26:46,599 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1142498957] [2022-11-25 23:26:46,600 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-25 23:26:46,600 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:26:46,600 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:26:46,600 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:26:46,601 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:26:46,650 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-25 23:26:46,650 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 [2022-11-25 23:26:46,702 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-25 23:26:46,703 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 [2022-11-25 23:26:46,725 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 [2022-11-25 23:26:46,777 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:26:46,779 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:26:46,791 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-25 23:26:46,791 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 [2022-11-25 23:26:46,831 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 [2022-11-25 23:26:46,887 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:26:47,157 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 [2022-11-25 23:26:47,157 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:26:47,157 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:26:47,157 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 50 [2022-11-25 23:26:47,157 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [504438322] [2022-11-25 23:26:47,157 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:26:47,158 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2022-11-25 23:26:47,158 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:26:47,159 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2022-11-25 23:26:47,159 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=601, Invalid=2369, Unknown=0, NotChecked=0, Total=2970 [2022-11-25 23:26:47,159 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) [2022-11-25 23:26:47,797 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:26:47,798 INFO L93 Difference]: Finished difference Result 56 states and 58 transitions. [2022-11-25 23:26:47,798 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-11-25 23:26:47,798 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 [2022-11-25 23:26:47,798 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:26:47,799 INFO L225 Difference]: With dead ends: 56 [2022-11-25 23:26:47,799 INFO L226 Difference]: Without dead ends: 53 [2022-11-25 23:26:47,800 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 [2022-11-25 23:26:47,800 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 11 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 456 mSolverCounterSat, 157 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 613 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 157 IncrementalHoareTripleChecker+Valid, 456 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-25 23:26:47,800 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 17 Invalid, 613 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [157 Valid, 456 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-25 23:26:47,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2022-11-25 23:26:47,870 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2022-11-25 23:26:47,870 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) [2022-11-25 23:26:47,870 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 55 transitions. [2022-11-25 23:26:47,870 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 55 transitions. Word has length 51 [2022-11-25 23:26:47,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:26:47,871 INFO L495 AbstractCegarLoop]: Abstraction has 53 states and 55 transitions. [2022-11-25 23:26:47,871 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) [2022-11-25 23:26:47,871 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 55 transitions. [2022-11-25 23:26:47,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2022-11-25 23:26:47,871 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:26:47,872 INFO L195 NwaCegarLoop]: trace histogram [15, 15, 15, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:26:47,877 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Forceful destruction successful, exit code 0 [2022-11-25 23:26:48,073 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42,42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:26:48,073 INFO L420 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:26:48,073 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:26:48,073 INFO L85 PathProgramCache]: Analyzing trace with hash -1763666440, now seen corresponding path program 42 times [2022-11-25 23:26:48,074 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:26:48,074 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1018198653] [2022-11-25 23:26:48,074 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:26:48,074 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:26:48,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:26:55,030 INFO L134 CoverageAnalysis]: Checked inductivity of 360 backedges. 0 proven. 360 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:26:55,031 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:26:55,031 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1018198653] [2022-11-25 23:26:55,031 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1018198653] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:26:55,035 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [825468822] [2022-11-25 23:26:55,035 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 23:26:55,035 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:26:55,035 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:26:55,036 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:26:55,060 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2022-11-25 23:26:55,429 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 23:26:55,429 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:26:55,434 INFO L263 TraceCheckSpWp]: Trace formula consists of 316 conjuncts, 132 conjunts are in the unsatisfiable core [2022-11-25 23:26:55,437 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:26:55,570 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 [2022-11-25 23:27:00,844 INFO L134 CoverageAnalysis]: Checked inductivity of 360 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2022-11-25 23:27:00,844 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:27:10,796 INFO L134 CoverageAnalysis]: Checked inductivity of 360 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2022-11-25 23:27:10,796 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [825468822] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:27:10,797 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [360935988] [2022-11-25 23:27:10,797 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-25 23:27:10,798 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:27:10,798 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:27:10,798 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:27:10,798 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:27:10,847 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-25 23:27:10,848 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 [2022-11-25 23:27:10,897 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-25 23:27:10,898 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 [2022-11-25 23:27:10,922 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 [2022-11-25 23:27:10,964 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:27:10,966 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:27:10,978 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-25 23:27:10,978 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 [2022-11-25 23:27:11,018 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 [2022-11-25 23:27:11,059 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:27:12,222 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 [2022-11-25 23:27:12,222 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:27:12,222 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:27:12,223 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 36, 35] total 114 [2022-11-25 23:27:12,223 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1719918918] [2022-11-25 23:27:12,223 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:27:12,224 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 114 states [2022-11-25 23:27:12,224 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:27:12,224 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 114 interpolants. [2022-11-25 23:27:12,225 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=461, Invalid=13581, Unknown=0, NotChecked=0, Total=14042 [2022-11-25 23:27:12,226 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) [2022-11-25 23:27:22,136 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:27:22,136 INFO L93 Difference]: Finished difference Result 73 states and 76 transitions. [2022-11-25 23:27:22,136 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2022-11-25 23:27:22,136 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 [2022-11-25 23:27:22,137 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:27:22,137 INFO L225 Difference]: With dead ends: 73 [2022-11-25 23:27:22,137 INFO L226 Difference]: Without dead ends: 70 [2022-11-25 23:27:22,139 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 225 GetRequests, 86 SyntacticMatches, 2 SemanticMatches, 137 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3240 ImplicationChecksByTransitivity, 23.6s TimeCoverageRelationStatistics Valid=673, Invalid=18509, Unknown=0, NotChecked=0, Total=19182 [2022-11-25 23:27:22,139 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 1 mSDsluCounter, 140 mSDsCounter, 0 mSdLazyCounter, 3795 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 143 SdHoareTripleChecker+Invalid, 3799 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 3795 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.0s IncrementalHoareTripleChecker+Time [2022-11-25 23:27:22,139 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 143 Invalid, 3799 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 3795 Invalid, 0 Unknown, 0 Unchecked, 5.0s Time] [2022-11-25 23:27:22,140 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2022-11-25 23:27:22,215 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 55. [2022-11-25 23:27:22,215 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) [2022-11-25 23:27:22,216 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 58 transitions. [2022-11-25 23:27:22,216 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 58 transitions. Word has length 52 [2022-11-25 23:27:22,216 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:27:22,216 INFO L495 AbstractCegarLoop]: Abstraction has 55 states and 58 transitions. [2022-11-25 23:27:22,216 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) [2022-11-25 23:27:22,217 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 58 transitions. [2022-11-25 23:27:22,217 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2022-11-25 23:27:22,217 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:27:22,217 INFO L195 NwaCegarLoop]: trace histogram [16, 15, 15, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:27:22,227 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Forceful destruction successful, exit code 0 [2022-11-25 23:27:22,423 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43,43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:27:22,424 INFO L420 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:27:22,424 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:27:22,424 INFO L85 PathProgramCache]: Analyzing trace with hash -1915597427, now seen corresponding path program 43 times [2022-11-25 23:27:22,424 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:27:22,424 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1548742438] [2022-11-25 23:27:22,424 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:27:22,424 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:27:22,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:27:23,032 INFO L134 CoverageAnalysis]: Checked inductivity of 376 backedges. 121 proven. 135 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2022-11-25 23:27:23,032 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:27:23,032 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1548742438] [2022-11-25 23:27:23,033 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1548742438] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:27:23,033 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1606838091] [2022-11-25 23:27:23,033 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 23:27:23,033 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:27:23,033 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:27:23,034 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:27:23,039 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2022-11-25 23:27:23,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:27:23,208 INFO L263 TraceCheckSpWp]: Trace formula consists of 321 conjuncts, 34 conjunts are in the unsatisfiable core [2022-11-25 23:27:23,209 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:27:23,766 INFO L134 CoverageAnalysis]: Checked inductivity of 376 backedges. 136 proven. 120 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2022-11-25 23:27:23,766 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:27:24,203 INFO L134 CoverageAnalysis]: Checked inductivity of 376 backedges. 136 proven. 120 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2022-11-25 23:27:24,204 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1606838091] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:27:24,204 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1171091775] [2022-11-25 23:27:24,205 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-25 23:27:24,205 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:27:24,205 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:27:24,205 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:27:24,205 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:27:24,257 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-25 23:27:24,258 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 [2022-11-25 23:27:24,268 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 [2022-11-25 23:27:24,287 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 [2022-11-25 23:27:24,332 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:27:24,334 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:27:24,347 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-25 23:27:24,347 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 [2022-11-25 23:27:24,390 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 [2022-11-25 23:27:24,432 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:27:24,784 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 [2022-11-25 23:27:24,784 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:27:24,784 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:27:24,784 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 52 [2022-11-25 23:27:24,784 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1467282972] [2022-11-25 23:27:24,784 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:27:24,785 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2022-11-25 23:27:24,785 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:27:24,785 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2022-11-25 23:27:24,786 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=678, Invalid=2514, Unknown=0, NotChecked=0, Total=3192 [2022-11-25 23:27:24,786 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) [2022-11-25 23:27:25,463 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:27:25,463 INFO L93 Difference]: Finished difference Result 111 states and 117 transitions. [2022-11-25 23:27:25,463 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-11-25 23:27:25,464 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 [2022-11-25 23:27:25,464 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:27:25,464 INFO L225 Difference]: With dead ends: 111 [2022-11-25 23:27:25,464 INFO L226 Difference]: Without dead ends: 59 [2022-11-25 23:27:25,465 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 [2022-11-25 23:27:25,465 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 11 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 290 mSolverCounterSat, 201 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 491 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 201 IncrementalHoareTripleChecker+Valid, 290 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-25 23:27:25,465 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 21 Invalid, 491 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [201 Valid, 290 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-25 23:27:25,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2022-11-25 23:27:25,533 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 55. [2022-11-25 23:27:25,533 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) [2022-11-25 23:27:25,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 57 transitions. [2022-11-25 23:27:25,533 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 57 transitions. Word has length 53 [2022-11-25 23:27:25,533 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:27:25,533 INFO L495 AbstractCegarLoop]: Abstraction has 55 states and 57 transitions. [2022-11-25 23:27:25,534 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) [2022-11-25 23:27:25,534 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 57 transitions. [2022-11-25 23:27:25,534 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2022-11-25 23:27:25,534 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:27:25,534 INFO L195 NwaCegarLoop]: trace histogram [16, 16, 15, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:27:25,539 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Forceful destruction successful, exit code 0 [2022-11-25 23:27:25,734 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable44 [2022-11-25 23:27:25,735 INFO L420 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:27:25,735 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:27:25,735 INFO L85 PathProgramCache]: Analyzing trace with hash 1147448685, now seen corresponding path program 44 times [2022-11-25 23:27:25,735 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:27:25,735 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1788613461] [2022-11-25 23:27:25,735 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:27:25,735 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:27:25,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:27:26,440 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 105 proven. 151 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2022-11-25 23:27:26,440 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:27:26,440 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1788613461] [2022-11-25 23:27:26,440 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1788613461] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:27:26,440 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1910760613] [2022-11-25 23:27:26,440 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:27:26,440 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:27:26,441 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:27:26,441 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:27:26,443 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2022-11-25 23:27:26,757 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2022-11-25 23:27:26,758 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:27:26,762 INFO L263 TraceCheckSpWp]: Trace formula consists of 328 conjuncts, 34 conjunts are in the unsatisfiable core [2022-11-25 23:27:26,763 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:27:27,225 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 120 proven. 136 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2022-11-25 23:27:27,225 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:27:27,727 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 120 proven. 136 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2022-11-25 23:27:27,727 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1910760613] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:27:27,727 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1628951684] [2022-11-25 23:27:27,728 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-25 23:27:27,728 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:27:27,728 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:27:27,729 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:27:27,729 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:27:27,777 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-25 23:27:27,778 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 [2022-11-25 23:27:27,831 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-25 23:27:27,831 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 [2022-11-25 23:27:27,854 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 [2022-11-25 23:27:27,911 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:27:27,912 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:27:27,937 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-25 23:27:27,938 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 [2022-11-25 23:27:28,013 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 [2022-11-25 23:27:28,083 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:27:28,867 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 [2022-11-25 23:27:28,867 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:27:28,867 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:27:28,867 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 53 [2022-11-25 23:27:28,868 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [623303213] [2022-11-25 23:27:28,868 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:27:28,868 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2022-11-25 23:27:28,868 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:27:28,869 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2022-11-25 23:27:28,869 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=671, Invalid=2635, Unknown=0, NotChecked=0, Total=3306 [2022-11-25 23:27:28,869 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) [2022-11-25 23:27:29,555 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:27:29,555 INFO L93 Difference]: Finished difference Result 59 states and 61 transitions. [2022-11-25 23:27:29,556 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-11-25 23:27:29,556 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 [2022-11-25 23:27:29,556 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:27:29,556 INFO L225 Difference]: With dead ends: 59 [2022-11-25 23:27:29,557 INFO L226 Difference]: Without dead ends: 56 [2022-11-25 23:27:29,557 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 [2022-11-25 23:27:29,558 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 14 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 493 mSolverCounterSat, 174 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 667 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 174 IncrementalHoareTripleChecker+Valid, 493 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-25 23:27:29,558 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 19 Invalid, 667 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [174 Valid, 493 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-25 23:27:29,558 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2022-11-25 23:27:29,626 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2022-11-25 23:27:29,626 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) [2022-11-25 23:27:29,626 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 58 transitions. [2022-11-25 23:27:29,626 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 58 transitions. Word has length 54 [2022-11-25 23:27:29,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:27:29,626 INFO L495 AbstractCegarLoop]: Abstraction has 56 states and 58 transitions. [2022-11-25 23:27:29,626 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) [2022-11-25 23:27:29,627 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 58 transitions. [2022-11-25 23:27:29,627 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-11-25 23:27:29,627 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:27:29,627 INFO L195 NwaCegarLoop]: trace histogram [16, 16, 16, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:27:29,635 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Forceful destruction successful, exit code 0 [2022-11-25 23:27:29,827 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable45 [2022-11-25 23:27:29,828 INFO L420 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:27:29,828 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:27:29,828 INFO L85 PathProgramCache]: Analyzing trace with hash 1211015175, now seen corresponding path program 45 times [2022-11-25 23:27:29,828 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:27:29,828 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1433860084] [2022-11-25 23:27:29,828 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:27:29,828 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:27:29,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:27:36,921 INFO L134 CoverageAnalysis]: Checked inductivity of 408 backedges. 0 proven. 408 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:27:36,922 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:27:36,922 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1433860084] [2022-11-25 23:27:36,922 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1433860084] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:27:36,922 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1716588635] [2022-11-25 23:27:36,922 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 23:27:36,922 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:27:36,922 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:27:36,923 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:27:36,926 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2022-11-25 23:27:37,146 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 23:27:37,146 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:27:37,151 INFO L263 TraceCheckSpWp]: Trace formula consists of 333 conjuncts, 142 conjunts are in the unsatisfiable core [2022-11-25 23:27:37,154 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:27:37,305 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 15 treesize of output 11 [2022-11-25 23:27:43,331 INFO L134 CoverageAnalysis]: Checked inductivity of 408 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2022-11-25 23:27:43,331 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:27:55,074 INFO L134 CoverageAnalysis]: Checked inductivity of 408 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2022-11-25 23:27:55,074 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1716588635] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:27:55,074 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1970736866] [2022-11-25 23:27:55,075 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-25 23:27:55,076 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:27:55,076 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:27:55,076 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:27:55,076 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:27:55,126 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-25 23:27:55,127 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 [2022-11-25 23:27:55,176 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-25 23:27:55,177 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 [2022-11-25 23:27:55,197 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 [2022-11-25 23:27:55,237 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:27:55,238 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:27:55,261 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-25 23:27:55,261 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 [2022-11-25 23:27:55,313 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 [2022-11-25 23:27:55,360 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:27:56,605 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 [2022-11-25 23:27:56,605 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:27:56,605 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:27:56,606 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 38, 37] total 121 [2022-11-25 23:27:56,606 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [710995176] [2022-11-25 23:27:56,606 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:27:56,606 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 121 states [2022-11-25 23:27:56,606 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:27:56,607 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 121 interpolants. [2022-11-25 23:27:56,607 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=496, Invalid=15254, Unknown=0, NotChecked=0, Total=15750 [2022-11-25 23:27:56,608 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) [2022-11-25 23:28:08,194 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:28:08,194 INFO L93 Difference]: Finished difference Result 77 states and 80 transitions. [2022-11-25 23:28:08,194 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2022-11-25 23:28:08,195 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 [2022-11-25 23:28:08,195 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:28:08,195 INFO L225 Difference]: With dead ends: 77 [2022-11-25 23:28:08,195 INFO L226 Difference]: Without dead ends: 74 [2022-11-25 23:28:08,196 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 91 SyntacticMatches, 2 SemanticMatches, 146 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3596 ImplicationChecksByTransitivity, 27.3s TimeCoverageRelationStatistics Valid=733, Invalid=21023, Unknown=0, NotChecked=0, Total=21756 [2022-11-25 23:28:08,196 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 1 mSDsluCounter, 154 mSDsCounter, 0 mSdLazyCounter, 4351 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 157 SdHoareTripleChecker+Invalid, 4355 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 4351 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.9s IncrementalHoareTripleChecker+Time [2022-11-25 23:28:08,196 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 157 Invalid, 4355 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 4351 Invalid, 0 Unknown, 0 Unchecked, 5.9s Time] [2022-11-25 23:28:08,197 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2022-11-25 23:28:08,274 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 58. [2022-11-25 23:28:08,274 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) [2022-11-25 23:28:08,275 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 61 transitions. [2022-11-25 23:28:08,275 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 61 transitions. Word has length 55 [2022-11-25 23:28:08,275 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:28:08,275 INFO L495 AbstractCegarLoop]: Abstraction has 58 states and 61 transitions. [2022-11-25 23:28:08,276 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) [2022-11-25 23:28:08,276 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 61 transitions. [2022-11-25 23:28:08,276 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2022-11-25 23:28:08,276 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:28:08,276 INFO L195 NwaCegarLoop]: trace histogram [17, 16, 16, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:28:08,283 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Forceful destruction successful, exit code 0 [2022-11-25 23:28:08,482 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46,46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:28:08,483 INFO L420 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:28:08,483 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:28:08,483 INFO L85 PathProgramCache]: Analyzing trace with hash -1991175652, now seen corresponding path program 46 times [2022-11-25 23:28:08,483 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:28:08,483 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [834111955] [2022-11-25 23:28:08,483 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:28:08,483 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:28:08,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:28:09,122 INFO L134 CoverageAnalysis]: Checked inductivity of 425 backedges. 137 proven. 152 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2022-11-25 23:28:09,122 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:28:09,122 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [834111955] [2022-11-25 23:28:09,122 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [834111955] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:28:09,122 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [46107915] [2022-11-25 23:28:09,122 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 23:28:09,122 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:28:09,123 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:28:09,123 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:28:09,126 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2022-11-25 23:28:09,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:28:09,307 INFO L263 TraceCheckSpWp]: Trace formula consists of 338 conjuncts, 36 conjunts are in the unsatisfiable core [2022-11-25 23:28:09,308 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:28:09,944 INFO L134 CoverageAnalysis]: Checked inductivity of 425 backedges. 153 proven. 136 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2022-11-25 23:28:09,944 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:28:10,431 INFO L134 CoverageAnalysis]: Checked inductivity of 425 backedges. 153 proven. 136 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2022-11-25 23:28:10,431 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [46107915] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:28:10,431 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2047120436] [2022-11-25 23:28:10,432 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-25 23:28:10,432 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:28:10,433 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:28:10,433 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:28:10,433 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:28:10,515 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-25 23:28:10,516 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 [2022-11-25 23:28:10,568 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-25 23:28:10,568 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 [2022-11-25 23:28:10,591 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 [2022-11-25 23:28:10,632 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:28:10,635 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:28:10,648 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-25 23:28:10,649 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 [2022-11-25 23:28:10,694 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 [2022-11-25 23:28:10,740 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:28:11,156 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 [2022-11-25 23:28:11,157 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:28:11,157 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:28:11,157 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 55 [2022-11-25 23:28:11,157 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2012475507] [2022-11-25 23:28:11,157 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:28:11,157 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2022-11-25 23:28:11,158 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:28:11,158 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2022-11-25 23:28:11,159 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=753, Invalid=2787, Unknown=0, NotChecked=0, Total=3540 [2022-11-25 23:28:11,159 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) [2022-11-25 23:28:11,912 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:28:11,912 INFO L93 Difference]: Finished difference Result 117 states and 123 transitions. [2022-11-25 23:28:11,915 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-11-25 23:28:11,915 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 [2022-11-25 23:28:11,915 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:28:11,916 INFO L225 Difference]: With dead ends: 117 [2022-11-25 23:28:11,916 INFO L226 Difference]: Without dead ends: 62 [2022-11-25 23:28:11,917 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 [2022-11-25 23:28:11,917 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 27 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 309 mSolverCounterSat, 223 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 532 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 223 IncrementalHoareTripleChecker+Valid, 309 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-25 23:28:11,917 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [27 Valid, 23 Invalid, 532 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [223 Valid, 309 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-25 23:28:11,918 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2022-11-25 23:28:12,006 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 58. [2022-11-25 23:28:12,006 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) [2022-11-25 23:28:12,006 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 60 transitions. [2022-11-25 23:28:12,006 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 60 transitions. Word has length 56 [2022-11-25 23:28:12,006 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:28:12,007 INFO L495 AbstractCegarLoop]: Abstraction has 58 states and 60 transitions. [2022-11-25 23:28:12,007 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) [2022-11-25 23:28:12,007 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 60 transitions. [2022-11-25 23:28:12,007 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2022-11-25 23:28:12,008 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:28:12,008 INFO L195 NwaCegarLoop]: trace histogram [17, 17, 16, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:28:12,018 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Forceful destruction successful, exit code 0 [2022-11-25 23:28:12,214 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2022-11-25 23:28:12,214 INFO L420 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:28:12,214 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:28:12,214 INFO L85 PathProgramCache]: Analyzing trace with hash -1659623876, now seen corresponding path program 47 times [2022-11-25 23:28:12,214 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:28:12,214 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2019503062] [2022-11-25 23:28:12,215 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:28:12,215 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:28:12,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:28:12,907 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 120 proven. 169 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2022-11-25 23:28:12,907 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:28:12,907 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2019503062] [2022-11-25 23:28:12,907 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2019503062] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:28:12,907 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [113792159] [2022-11-25 23:28:12,907 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:28:12,908 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:28:12,908 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:28:12,908 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:28:12,911 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Waiting until timeout for monitored process [2022-11-25 23:28:13,357 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2022-11-25 23:28:13,357 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:28:13,361 INFO L263 TraceCheckSpWp]: Trace formula consists of 345 conjuncts, 36 conjunts are in the unsatisfiable core [2022-11-25 23:28:13,362 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:28:13,857 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 136 proven. 153 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2022-11-25 23:28:13,857 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:28:14,426 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 136 proven. 153 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2022-11-25 23:28:14,426 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [113792159] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:28:14,426 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1649239705] [2022-11-25 23:28:14,427 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-25 23:28:14,428 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:28:14,428 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:28:14,428 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:28:14,428 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:28:14,481 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-25 23:28:14,481 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 [2022-11-25 23:28:14,490 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 [2022-11-25 23:28:14,510 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 [2022-11-25 23:28:14,549 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:28:14,550 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:28:14,572 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-25 23:28:14,573 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 [2022-11-25 23:28:14,646 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 [2022-11-25 23:28:14,700 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:28:15,541 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 [2022-11-25 23:28:15,541 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:28:15,541 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:28:15,541 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 56 [2022-11-25 23:28:15,542 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1434308781] [2022-11-25 23:28:15,542 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:28:15,542 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2022-11-25 23:28:15,542 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:28:15,543 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2022-11-25 23:28:15,543 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=745, Invalid=2915, Unknown=0, NotChecked=0, Total=3660 [2022-11-25 23:28:15,543 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) [2022-11-25 23:28:16,260 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:28:16,261 INFO L93 Difference]: Finished difference Result 62 states and 64 transitions. [2022-11-25 23:28:16,261 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-11-25 23:28:16,261 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 [2022-11-25 23:28:16,261 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:28:16,262 INFO L225 Difference]: With dead ends: 62 [2022-11-25 23:28:16,262 INFO L226 Difference]: Without dead ends: 59 [2022-11-25 23:28:16,262 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 [2022-11-25 23:28:16,263 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 14 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 440 mSolverCounterSat, 164 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 604 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 164 IncrementalHoareTripleChecker+Valid, 440 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-25 23:28:16,263 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 13 Invalid, 604 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [164 Valid, 440 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-25 23:28:16,263 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2022-11-25 23:28:16,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2022-11-25 23:28:16,345 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) [2022-11-25 23:28:16,345 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 61 transitions. [2022-11-25 23:28:16,346 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 61 transitions. Word has length 57 [2022-11-25 23:28:16,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:28:16,346 INFO L495 AbstractCegarLoop]: Abstraction has 59 states and 61 transitions. [2022-11-25 23:28:16,346 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) [2022-11-25 23:28:16,346 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 61 transitions. [2022-11-25 23:28:16,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-11-25 23:28:16,346 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:28:16,346 INFO L195 NwaCegarLoop]: trace histogram [17, 17, 17, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:28:16,352 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Forceful destruction successful, exit code 0 [2022-11-25 23:28:16,547 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable48 [2022-11-25 23:28:16,547 INFO L420 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:28:16,547 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:28:16,547 INFO L85 PathProgramCache]: Analyzing trace with hash 91111704, now seen corresponding path program 48 times [2022-11-25 23:28:16,547 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:28:16,547 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [891520354] [2022-11-25 23:28:16,547 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:28:16,548 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:28:16,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:28:30,273 INFO L134 CoverageAnalysis]: Checked inductivity of 459 backedges. 91 proven. 368 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:28:30,273 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:28:30,273 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [891520354] [2022-11-25 23:28:30,273 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [891520354] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:28:30,273 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [533161331] [2022-11-25 23:28:30,273 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 23:28:30,274 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:28:30,274 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:28:30,274 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:28:30,277 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Waiting until timeout for monitored process [2022-11-25 23:28:30,566 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 23:28:30,566 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:28:30,571 INFO L263 TraceCheckSpWp]: Trace formula consists of 350 conjuncts, 148 conjunts are in the unsatisfiable core [2022-11-25 23:28:30,573 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:28:30,726 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 [2022-11-25 23:28:37,860 INFO L134 CoverageAnalysis]: Checked inductivity of 459 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2022-11-25 23:28:37,860 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:28:48,828 INFO L134 CoverageAnalysis]: Checked inductivity of 459 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2022-11-25 23:28:48,828 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [533161331] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:28:48,829 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1839662461] [2022-11-25 23:28:48,829 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-25 23:28:48,829 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:28:48,829 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:28:48,830 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:28:48,830 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:28:48,880 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-25 23:28:48,882 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 [2022-11-25 23:28:48,949 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-25 23:28:48,950 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 [2022-11-25 23:28:48,969 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 [2022-11-25 23:28:49,031 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:28:49,034 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:28:49,046 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-25 23:28:49,046 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 [2022-11-25 23:28:49,084 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 [2022-11-25 23:28:49,130 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:28:50,281 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 [2022-11-25 23:28:50,281 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:28:50,281 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:28:50,281 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 40, 39] total 128 [2022-11-25 23:28:50,282 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1554092800] [2022-11-25 23:28:50,282 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:28:50,282 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 128 states [2022-11-25 23:28:50,282 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:28:50,283 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 128 interpolants. [2022-11-25 23:28:50,283 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=808, Invalid=16748, Unknown=0, NotChecked=0, Total=17556 [2022-11-25 23:28:50,283 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) [2022-11-25 23:29:07,583 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:29:07,583 INFO L93 Difference]: Finished difference Result 85 states and 88 transitions. [2022-11-25 23:29:07,583 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2022-11-25 23:29:07,583 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 [2022-11-25 23:29:07,584 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:29:07,584 INFO L225 Difference]: With dead ends: 85 [2022-11-25 23:29:07,584 INFO L226 Difference]: Without dead ends: 82 [2022-11-25 23:29:07,585 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 269 GetRequests, 96 SyntacticMatches, 2 SemanticMatches, 171 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8391 ImplicationChecksByTransitivity, 35.1s TimeCoverageRelationStatistics Valid=1567, Invalid=28189, Unknown=0, NotChecked=0, Total=29756 [2022-11-25 23:29:07,585 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 6 mSDsluCounter, 253 mSDsCounter, 0 mSdLazyCounter, 3794 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 258 SdHoareTripleChecker+Invalid, 3803 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 3794 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.3s IncrementalHoareTripleChecker+Time [2022-11-25 23:29:07,586 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 258 Invalid, 3803 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 3794 Invalid, 0 Unknown, 0 Unchecked, 6.3s Time] [2022-11-25 23:29:07,586 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2022-11-25 23:29:07,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 61. [2022-11-25 23:29:07,691 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) [2022-11-25 23:29:07,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 64 transitions. [2022-11-25 23:29:07,691 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 64 transitions. Word has length 58 [2022-11-25 23:29:07,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:29:07,692 INFO L495 AbstractCegarLoop]: Abstraction has 61 states and 64 transitions. [2022-11-25 23:29:07,692 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) [2022-11-25 23:29:07,692 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 64 transitions. [2022-11-25 23:29:07,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-11-25 23:29:07,692 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:29:07,693 INFO L195 NwaCegarLoop]: trace histogram [18, 17, 17, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:29:07,700 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Forceful destruction successful, exit code 0 [2022-11-25 23:29:07,900 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2022-11-25 23:29:07,900 INFO L420 AbstractCegarLoop]: === Iteration 51 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:29:07,900 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:29:07,900 INFO L85 PathProgramCache]: Analyzing trace with hash 1382784557, now seen corresponding path program 49 times [2022-11-25 23:29:07,900 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:29:07,900 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [298385829] [2022-11-25 23:29:07,900 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:29:07,901 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:29:07,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:29:08,638 INFO L134 CoverageAnalysis]: Checked inductivity of 477 backedges. 154 proven. 170 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2022-11-25 23:29:08,638 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:29:08,638 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [298385829] [2022-11-25 23:29:08,638 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [298385829] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:29:08,639 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [312654546] [2022-11-25 23:29:08,639 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 23:29:08,639 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:29:08,639 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:29:08,640 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:29:08,643 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Waiting until timeout for monitored process [2022-11-25 23:29:08,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:29:08,838 INFO L263 TraceCheckSpWp]: Trace formula consists of 355 conjuncts, 38 conjunts are in the unsatisfiable core [2022-11-25 23:29:08,840 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:29:09,552 INFO L134 CoverageAnalysis]: Checked inductivity of 477 backedges. 171 proven. 153 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2022-11-25 23:29:09,552 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:29:10,095 INFO L134 CoverageAnalysis]: Checked inductivity of 477 backedges. 171 proven. 153 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2022-11-25 23:29:10,095 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [312654546] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:29:10,095 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2130831088] [2022-11-25 23:29:10,096 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-25 23:29:10,096 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:29:10,096 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:29:10,097 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:29:10,097 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:29:10,146 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-25 23:29:10,146 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 [2022-11-25 23:29:10,198 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-25 23:29:10,198 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 [2022-11-25 23:29:10,220 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 [2022-11-25 23:29:10,284 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:29:10,286 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:29:10,298 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-25 23:29:10,299 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 [2022-11-25 23:29:10,339 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 [2022-11-25 23:29:10,404 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:29:11,602 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 [2022-11-25 23:29:11,602 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:29:11,602 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:29:11,602 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 58 [2022-11-25 23:29:11,602 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [185532230] [2022-11-25 23:29:11,602 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:29:11,603 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2022-11-25 23:29:11,603 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:29:11,603 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2022-11-25 23:29:11,603 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=832, Invalid=3074, Unknown=0, NotChecked=0, Total=3906 [2022-11-25 23:29:11,604 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) [2022-11-25 23:29:12,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:29:12,460 INFO L93 Difference]: Finished difference Result 123 states and 129 transitions. [2022-11-25 23:29:12,460 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-11-25 23:29:12,460 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 [2022-11-25 23:29:12,460 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:29:12,461 INFO L225 Difference]: With dead ends: 123 [2022-11-25 23:29:12,461 INFO L226 Difference]: Without dead ends: 65 [2022-11-25 23:29:12,462 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 99 SyntacticMatches, 53 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3658 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=1381, Invalid=5099, Unknown=0, NotChecked=0, Total=6480 [2022-11-25 23:29:12,462 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 11 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 383 mSolverCounterSat, 289 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 672 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 289 IncrementalHoareTripleChecker+Valid, 383 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-25 23:29:12,462 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 19 Invalid, 672 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [289 Valid, 383 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-25 23:29:12,463 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2022-11-25 23:29:12,549 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 61. [2022-11-25 23:29:12,549 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) [2022-11-25 23:29:12,549 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 63 transitions. [2022-11-25 23:29:12,549 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 63 transitions. Word has length 59 [2022-11-25 23:29:12,549 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:29:12,549 INFO L495 AbstractCegarLoop]: Abstraction has 61 states and 63 transitions. [2022-11-25 23:29:12,549 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) [2022-11-25 23:29:12,550 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 63 transitions. [2022-11-25 23:29:12,550 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2022-11-25 23:29:12,550 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:29:12,550 INFO L195 NwaCegarLoop]: trace histogram [18, 18, 17, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:29:12,556 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Forceful destruction successful, exit code 0 [2022-11-25 23:29:12,750 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50,50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:29:12,751 INFO L420 AbstractCegarLoop]: === Iteration 52 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:29:12,751 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:29:12,751 INFO L85 PathProgramCache]: Analyzing trace with hash 216962573, now seen corresponding path program 50 times [2022-11-25 23:29:12,751 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:29:12,751 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1109911932] [2022-11-25 23:29:12,751 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:29:12,751 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:29:12,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:29:13,522 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 136 proven. 188 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2022-11-25 23:29:13,522 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:29:13,522 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1109911932] [2022-11-25 23:29:13,522 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1109911932] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:29:13,522 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1641858613] [2022-11-25 23:29:13,523 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:29:13,523 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:29:13,523 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:29:13,524 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:29:13,526 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Waiting until timeout for monitored process [2022-11-25 23:29:14,121 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2022-11-25 23:29:14,121 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:29:14,125 INFO L263 TraceCheckSpWp]: Trace formula consists of 362 conjuncts, 38 conjunts are in the unsatisfiable core [2022-11-25 23:29:14,126 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:29:14,681 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 153 proven. 171 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2022-11-25 23:29:14,682 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:29:15,349 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 153 proven. 171 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2022-11-25 23:29:15,350 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1641858613] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:29:15,350 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1606756904] [2022-11-25 23:29:15,351 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-25 23:29:15,351 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:29:15,351 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:29:15,351 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:29:15,352 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:29:15,420 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-25 23:29:15,420 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 [2022-11-25 23:29:15,431 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 [2022-11-25 23:29:15,452 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 [2022-11-25 23:29:15,505 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:29:15,506 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:29:15,534 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-25 23:29:15,534 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 [2022-11-25 23:29:15,615 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 [2022-11-25 23:29:15,676 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:29:16,593 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 [2022-11-25 23:29:16,594 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:29:16,594 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:29:16,594 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 59 [2022-11-25 23:29:16,594 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1503865198] [2022-11-25 23:29:16,594 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:29:16,594 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2022-11-25 23:29:16,595 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:29:16,595 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2022-11-25 23:29:16,596 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=823, Invalid=3209, Unknown=0, NotChecked=0, Total=4032 [2022-11-25 23:29:16,596 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) [2022-11-25 23:29:17,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:29:17,393 INFO L93 Difference]: Finished difference Result 65 states and 67 transitions. [2022-11-25 23:29:17,393 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2022-11-25 23:29:17,393 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 [2022-11-25 23:29:17,394 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:29:17,394 INFO L225 Difference]: With dead ends: 65 [2022-11-25 23:29:17,394 INFO L226 Difference]: Without dead ends: 62 [2022-11-25 23:29:17,395 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 [2022-11-25 23:29:17,395 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 14 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 474 mSolverCounterSat, 187 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 661 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 187 IncrementalHoareTripleChecker+Valid, 474 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-25 23:29:17,395 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 13 Invalid, 661 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [187 Valid, 474 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-25 23:29:17,396 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2022-11-25 23:29:17,485 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 62. [2022-11-25 23:29:17,485 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) [2022-11-25 23:29:17,485 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 64 transitions. [2022-11-25 23:29:17,485 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 64 transitions. Word has length 60 [2022-11-25 23:29:17,486 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:29:17,486 INFO L495 AbstractCegarLoop]: Abstraction has 62 states and 64 transitions. [2022-11-25 23:29:17,486 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) [2022-11-25 23:29:17,486 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 64 transitions. [2022-11-25 23:29:17,486 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-11-25 23:29:17,486 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:29:17,486 INFO L195 NwaCegarLoop]: trace histogram [18, 18, 18, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:29:17,493 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Forceful destruction successful, exit code 0 [2022-11-25 23:29:17,687 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable51 [2022-11-25 23:29:17,687 INFO L420 AbstractCegarLoop]: === Iteration 53 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:29:17,687 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:29:17,687 INFO L85 PathProgramCache]: Analyzing trace with hash -1864250521, now seen corresponding path program 51 times [2022-11-25 23:29:17,688 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:29:17,688 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [910092796] [2022-11-25 23:29:17,688 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:29:17,688 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:29:17,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:29:35,706 INFO L134 CoverageAnalysis]: Checked inductivity of 513 backedges. 120 proven. 393 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:29:35,706 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:29:35,707 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [910092796] [2022-11-25 23:29:35,707 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [910092796] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:29:35,707 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [629831095] [2022-11-25 23:29:35,707 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 23:29:35,707 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:29:35,707 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:29:35,708 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:29:35,711 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Waiting until timeout for monitored process [2022-11-25 23:29:36,058 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 23:29:36,058 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:29:36,064 INFO L263 TraceCheckSpWp]: Trace formula consists of 367 conjuncts, 156 conjunts are in the unsatisfiable core [2022-11-25 23:29:36,066 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:29:36,213 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2022-11-25 23:29:44,082 INFO L134 CoverageAnalysis]: Checked inductivity of 513 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2022-11-25 23:29:44,083 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:29:55,852 INFO L134 CoverageAnalysis]: Checked inductivity of 513 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2022-11-25 23:29:55,853 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [629831095] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:29:55,853 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2075534188] [2022-11-25 23:29:55,854 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-25 23:29:55,854 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:29:55,854 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:29:55,854 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:29:55,854 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:29:55,903 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-25 23:29:55,903 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 [2022-11-25 23:29:55,956 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-25 23:29:55,956 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 [2022-11-25 23:29:55,974 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 [2022-11-25 23:29:56,014 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:29:56,017 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:29:56,029 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-25 23:29:56,029 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 [2022-11-25 23:29:56,071 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 [2022-11-25 23:29:56,113 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:29:57,328 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 [2022-11-25 23:29:57,329 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:29:57,329 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:29:57,329 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 42, 41] total 135 [2022-11-25 23:29:57,329 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [546154314] [2022-11-25 23:29:57,329 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:29:57,330 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 135 states [2022-11-25 23:29:57,330 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:29:57,331 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 135 interpolants. [2022-11-25 23:29:57,332 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=937, Invalid=18523, Unknown=0, NotChecked=0, Total=19460 [2022-11-25 23:29:57,332 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) [2022-11-25 23:30:19,895 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:30:19,895 INFO L93 Difference]: Finished difference Result 89 states and 92 transitions. [2022-11-25 23:30:19,896 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2022-11-25 23:30:19,896 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 [2022-11-25 23:30:19,896 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:30:19,897 INFO L225 Difference]: With dead ends: 89 [2022-11-25 23:30:19,897 INFO L226 Difference]: Without dead ends: 86 [2022-11-25 23:30:19,899 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 285 GetRequests, 101 SyntacticMatches, 2 SemanticMatches, 182 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9649 ImplicationChecksByTransitivity, 40.8s TimeCoverageRelationStatistics Valid=1851, Invalid=31821, Unknown=0, NotChecked=0, Total=33672 [2022-11-25 23:30:19,899 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 13 mSDsluCounter, 278 mSDsCounter, 0 mSdLazyCounter, 4380 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 283 SdHoareTripleChecker+Invalid, 4401 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 4380 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.8s IncrementalHoareTripleChecker+Time [2022-11-25 23:30:19,899 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 283 Invalid, 4401 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 4380 Invalid, 0 Unknown, 0 Unchecked, 7.8s Time] [2022-11-25 23:30:19,900 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2022-11-25 23:30:20,015 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 64. [2022-11-25 23:30:20,015 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) [2022-11-25 23:30:20,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 67 transitions. [2022-11-25 23:30:20,015 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 67 transitions. Word has length 61 [2022-11-25 23:30:20,016 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:30:20,016 INFO L495 AbstractCegarLoop]: Abstraction has 64 states and 67 transitions. [2022-11-25 23:30:20,016 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) [2022-11-25 23:30:20,016 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 67 transitions. [2022-11-25 23:30:20,016 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2022-11-25 23:30:20,016 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:30:20,016 INFO L195 NwaCegarLoop]: trace histogram [19, 18, 18, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:30:20,022 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Forceful destruction successful, exit code 0 [2022-11-25 23:30:20,217 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable52 [2022-11-25 23:30:20,217 INFO L420 AbstractCegarLoop]: === Iteration 54 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:30:20,217 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:30:20,217 INFO L85 PathProgramCache]: Analyzing trace with hash 600093436, now seen corresponding path program 52 times [2022-11-25 23:30:20,217 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:30:20,217 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1520464781] [2022-11-25 23:30:20,217 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:30:20,218 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:30:20,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:30:21,009 INFO L134 CoverageAnalysis]: Checked inductivity of 532 backedges. 172 proven. 189 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2022-11-25 23:30:21,009 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:30:21,009 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1520464781] [2022-11-25 23:30:21,009 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1520464781] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:30:21,009 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [936871531] [2022-11-25 23:30:21,009 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 23:30:21,010 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:30:21,010 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:30:21,011 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:30:21,013 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Waiting until timeout for monitored process [2022-11-25 23:30:21,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:30:21,221 INFO L263 TraceCheckSpWp]: Trace formula consists of 372 conjuncts, 40 conjunts are in the unsatisfiable core [2022-11-25 23:30:21,223 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:30:22,004 INFO L134 CoverageAnalysis]: Checked inductivity of 532 backedges. 190 proven. 171 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2022-11-25 23:30:22,004 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:30:22,609 INFO L134 CoverageAnalysis]: Checked inductivity of 532 backedges. 190 proven. 171 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2022-11-25 23:30:22,610 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [936871531] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:30:22,610 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1460062716] [2022-11-25 23:30:22,611 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-25 23:30:22,611 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:30:22,611 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:30:22,612 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:30:22,612 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:30:22,661 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-25 23:30:22,661 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 [2022-11-25 23:30:22,712 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-25 23:30:22,712 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 [2022-11-25 23:30:22,746 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 [2022-11-25 23:30:22,797 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:30:22,800 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:30:22,813 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-25 23:30:22,813 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 [2022-11-25 23:30:22,856 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 [2022-11-25 23:30:22,932 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:30:24,219 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 [2022-11-25 23:30:24,219 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:30:24,219 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:30:24,219 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 61 [2022-11-25 23:30:24,220 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [19684978] [2022-11-25 23:30:24,220 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:30:24,220 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 61 states [2022-11-25 23:30:24,220 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:30:24,221 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2022-11-25 23:30:24,221 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=915, Invalid=3375, Unknown=0, NotChecked=0, Total=4290 [2022-11-25 23:30:24,221 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) [2022-11-25 23:30:25,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:30:25,133 INFO L93 Difference]: Finished difference Result 129 states and 135 transitions. [2022-11-25 23:30:25,135 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2022-11-25 23:30:25,135 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 [2022-11-25 23:30:25,135 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:30:25,136 INFO L225 Difference]: With dead ends: 129 [2022-11-25 23:30:25,136 INFO L226 Difference]: Without dead ends: 68 [2022-11-25 23:30:25,137 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 [2022-11-25 23:30:25,137 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 19 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 357 mSolverCounterSat, 284 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 641 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 284 IncrementalHoareTripleChecker+Valid, 357 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-25 23:30:25,137 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 15 Invalid, 641 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [284 Valid, 357 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-25 23:30:25,138 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2022-11-25 23:30:25,242 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 64. [2022-11-25 23:30:25,243 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) [2022-11-25 23:30:25,243 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 66 transitions. [2022-11-25 23:30:25,243 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 66 transitions. Word has length 62 [2022-11-25 23:30:25,243 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:30:25,243 INFO L495 AbstractCegarLoop]: Abstraction has 64 states and 66 transitions. [2022-11-25 23:30:25,243 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) [2022-11-25 23:30:25,243 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 66 transitions. [2022-11-25 23:30:25,244 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2022-11-25 23:30:25,244 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:30:25,244 INFO L195 NwaCegarLoop]: trace histogram [19, 19, 18, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:30:25,251 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Forceful destruction successful, exit code 0 [2022-11-25 23:30:25,446 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53,53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:30:25,447 INFO L420 AbstractCegarLoop]: === Iteration 55 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:30:25,447 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:30:25,447 INFO L85 PathProgramCache]: Analyzing trace with hash -1297076452, now seen corresponding path program 53 times [2022-11-25 23:30:25,447 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:30:25,447 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1695269001] [2022-11-25 23:30:25,447 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:30:25,447 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:30:25,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:30:26,299 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 153 proven. 208 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2022-11-25 23:30:26,299 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:30:26,300 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1695269001] [2022-11-25 23:30:26,300 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1695269001] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:30:26,300 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1387239677] [2022-11-25 23:30:26,300 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:30:26,300 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:30:26,300 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:30:26,301 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:30:26,303 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Waiting until timeout for monitored process [2022-11-25 23:30:26,924 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2022-11-25 23:30:26,924 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:30:26,929 INFO L263 TraceCheckSpWp]: Trace formula consists of 379 conjuncts, 40 conjunts are in the unsatisfiable core [2022-11-25 23:30:26,930 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:30:27,532 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 171 proven. 190 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2022-11-25 23:30:27,532 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:30:28,195 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 171 proven. 190 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2022-11-25 23:30:28,196 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1387239677] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:30:28,196 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1355820022] [2022-11-25 23:30:28,197 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-25 23:30:28,197 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:30:28,197 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:30:28,197 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:30:28,197 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:30:28,252 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-25 23:30:28,252 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 [2022-11-25 23:30:28,268 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 [2022-11-25 23:30:28,286 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 [2022-11-25 23:30:28,326 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:30:28,328 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:30:28,340 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-25 23:30:28,341 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 [2022-11-25 23:30:28,402 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 [2022-11-25 23:30:28,442 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:30:28,748 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 [2022-11-25 23:30:28,748 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:30:28,748 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:30:28,748 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41] total 62 [2022-11-25 23:30:28,748 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1554140545] [2022-11-25 23:30:28,748 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:30:28,749 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 62 states [2022-11-25 23:30:28,749 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:30:28,749 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2022-11-25 23:30:28,750 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=905, Invalid=3517, Unknown=0, NotChecked=0, Total=4422 [2022-11-25 23:30:28,750 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) [2022-11-25 23:30:29,589 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:30:29,589 INFO L93 Difference]: Finished difference Result 68 states and 70 transitions. [2022-11-25 23:30:29,589 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2022-11-25 23:30:29,590 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 [2022-11-25 23:30:29,590 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:30:29,590 INFO L225 Difference]: With dead ends: 68 [2022-11-25 23:30:29,590 INFO L226 Difference]: Without dead ends: 65 [2022-11-25 23:30:29,591 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 [2022-11-25 23:30:29,591 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 14 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 490 mSolverCounterSat, 209 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 699 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 209 IncrementalHoareTripleChecker+Valid, 490 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-25 23:30:29,591 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 11 Invalid, 699 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [209 Valid, 490 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-25 23:30:29,592 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2022-11-25 23:30:29,691 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2022-11-25 23:30:29,691 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) [2022-11-25 23:30:29,692 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 67 transitions. [2022-11-25 23:30:29,692 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 67 transitions. Word has length 63 [2022-11-25 23:30:29,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:30:29,692 INFO L495 AbstractCegarLoop]: Abstraction has 65 states and 67 transitions. [2022-11-25 23:30:29,693 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) [2022-11-25 23:30:29,693 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 67 transitions. [2022-11-25 23:30:29,693 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-11-25 23:30:29,693 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:30:29,693 INFO L195 NwaCegarLoop]: trace histogram [19, 19, 19, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:30:29,701 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Forceful destruction successful, exit code 0 [2022-11-25 23:30:29,901 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54,54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:30:29,901 INFO L420 AbstractCegarLoop]: === Iteration 56 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:30:29,901 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:30:29,901 INFO L85 PathProgramCache]: Analyzing trace with hash -1554820040, now seen corresponding path program 54 times [2022-11-25 23:30:29,901 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:30:29,901 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1146608492] [2022-11-25 23:30:29,902 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:30:29,902 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:30:30,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:30:49,202 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 136 proven. 434 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:30:49,202 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:30:49,202 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1146608492] [2022-11-25 23:30:49,202 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1146608492] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:30:49,202 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1784152180] [2022-11-25 23:30:49,202 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 23:30:49,202 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:30:49,203 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:30:49,203 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:30:49,206 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48ae9fd3-dd4a-4a39-aa98-76a61829ba88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Waiting until timeout for monitored process [2022-11-25 23:30:49,511 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 23:30:49,511 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:30:49,516 INFO L263 TraceCheckSpWp]: Trace formula consists of 384 conjuncts, 162 conjunts are in the unsatisfiable core [2022-11-25 23:30:49,519 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:30:58,238 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2022-11-25 23:30:58,238 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:31:34,486 WARN L233 SmtUtils]: Spent 23.28s 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) [2022-11-25 23:31:34,487 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-25 23:31:34,487 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